• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a cleaning device (100) for projecting at least one fluid to a surface to be cleaned of a motor vehicle, such as an optical sensor of an optical detection system, in which a movable piston (3) sliding in a hollow body (1) around a fixed rod extending along a longitudinal axis (X) and carrying at one end a dispensing element (8, 9) of cleaning fluid, allows conveying a fluid to the dispensing element (8, 9) through passage channels (12) formed between the piston and the stem and having different axial dimensions.
    公开号:FR3056518A1
    申请号:FR1659181
    申请日:2016-09-28
    公开日:2018-03-30
    发明作者:Marcel Trebouet；Frederic Giraud
    申请人:Valeo Systemes dEssuyage SAS；
    IPC主号:
    专利说明:

    ® FRENCH REPUBLIC
    NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number: 3,056,518 (to be used only for reproduction orders)
    ©) National registration number: 16 59181
    COURBEVOIE © IntCI 8
    B 60 S 1/48 (2017.01), B 60 S 1/56
    A1 PATENT APPLICATION
    ©) Date of filing: 28.09.16. © Applicant (s): VALEO WIPING SYSTEMS (30) Priority: Simplified joint stock company - FR. @ Inventor (s): TREBOUET MARCEL and GIRAUD FREDERIC. (43) Date of public availability of the request: 30.03.18 Bulletin 18/13. ©) List of documents cited in the report preliminary research: Refer to end of present booklet (© References to other national documents ® Holder (s): VALEO WIPING SYSTEMS related: Joint stock company. ©) Extension request (s): © Agent (s): VALEO WIPING SYSTEMS INDUSTRIAL PROPERTY SERVICE.
    DEVICE FOR CLEANING AN OPTICAL SENSOR OF AN OPTICAL DETECTION SYSTEM FOR A MOTOR VEHICLE.
    FR 3 056 518 - A1
    The invention relates to a cleaning device (100) intended to project at least one fluid towards a surface to be cleaned of a motor vehicle, such as an optical sensor of an optical detection system, in which a movable piston (3) sliding in a hollow body (1) around a fixed rod extending along a longitudinal axis (X) and carrying at one end of a dispensing element (8, 9) of cleaning fluid, allows the delivery of a fluid to the distribution element (8, 9), via passage channels (12) formed between the piston and the rod and having different axial dimensions.

    WFR2643
    DEVICE FOR CLEANING AN OPTICAL SENSOR OF AN OPTICAL DETECTION SYSTEM FOR A MOTOR VEHICLE
    The present invention relates to the field of driving assistance devices and optical detection systems used for this purpose, and it relates more particularly to cleaning devices intended to spray at least one fluid towards a surface to be cleaned of. a motor vehicle, such as an optical sensor of an optical detection system for a vehicle.
    An optical detection system is any system comprising optical sensors such as cameras, laser sensors or other sensors based on the emission and / or detection of light in the visible or invisible spectrum for humans, in particular infrared.
    Such optical detection systems are fitted to an increasing number of motor vehicles in order to assist the driver of the vehicle in certain driving situations, one of which, well known, is the parking aid. For this aid to be as effective as possible, the data provided by the optical detection system must be of the best possible quality, and it is therefore essential to have own sensors to carry out these data acquisitions. To do this, a cleaning device
    0 can be ordered to inject, on a sensor of the optical detection system (for example the lens of a camera), a cleaning fluid just before the detection is carried out (for example the shot).
    These cleaning devices must not interfere with the operation of the optical sensor, that is to say that they must not in particular be in the
    5 field of vision of the sensor, and they must also be as compact as possible to meet the constraints of space requirement of the vehicle. For this, most often, the cleaning devices comprise a movable part between a cleaning position, deployed, in which dispensing orifices that the movable part has are located in the vicinity of the surface of the sensor.
    0 to be cleaned, and a rest position, in which this movable part is retracted so as not to hinder optical detection by means of the sensor considered.
    WFR2643
    The movable part forms a piston housed in a cylinder cylinder. It is known to use the pressure of the cleaning fluid admitted into the cylinder to cause the piston to move towards its cleaning position, the cleaning fluid being moreover intended to penetrate an internal conduit of the movable part, at least when this is in the cleaning position, to then be injected via the dispensing orifices.
    The cleaning fluid enters an intake chamber formed in the body via an intake orifice formed in an end piece of the cylinder, and the fluid present in the chamber pushes on one end of the movable piston in the body. The piston then slides along a rod integral with the tongue.
    It is known to provide grooves in which the cleaning fluid can be inserted from a first upstream end facing the chamber at the free end of the fixed rod, integral with the cylinder and along which the piston slides. 'admission. Up to a determined relative position of the piston relative to the rod, the sliding takes place in a sealed manner: the position of the piston completely covers the grooves formed in the thickness of the rod. The fluid present in the chamber is stopped by a sealing element and cannot access the passage grooves, so that the path of the fluid towards the dispensing orifices is blocked.
    0 Beyond a defined position, the grooves are no longer covered by the piston at their first upstream end, and this allows the passage of the fluid in the grooves, between the rod and the piston, towards the interior of the movable part to the dispensing orifices.
    As an example, document FR3021014 discloses such a device for
    5 cleaning in which the fixed rod integral with the cylinder peripherally comprises a plurality of grooves each forming a passage for the cleaning liquid. As explained above, the fluid can only be ejected when the movable part reaches a determined position relative to the rod and therefore when the dispensing orifices arranged at the end of this movable part reaches a determined position opposite the optical sensor . At this stage, the cleaning fluid arrives massively in the internal duct, the
    WFR2643 ends of the grooves being released simultaneously.
    A disadvantage of this embodiment is that the cleaning fluid leaves with a maximum flow rate from the start to the end of the spraying and the absence of variation of the flow rate prevents any optimization of the consumption of the fluid.
    The object of the present invention is to provide a cleaning device, intended to project at least one fluid towards a surface to be cleaned of a motor vehicle, such as an optical sensor of an optical detection system which, by an arrangement and a specific dimensioning of cleaning fluid passage channels, makes it possible to sequence the ejection of cleaning fluid through the intake orifices, so that the consumption of fluid is optimized and that the cleaning efficiency of the optical sensor is improved .
    The first object of the invention is a cleaning device intended to project at least one fluid towards a surface to be cleaned of a motor vehicle, such as an optical sensor of an optical detection system for a vehicle, comprising:
    - a hollow body closed at one end by an inlet flange,
    a piston movable by sliding along a longitudinal axis in the hollow body and carrying at a first end of a cleaning fluid distribution element, the piston being movable between an extreme retracted position and an extreme deployed position,
    - a rod integral with the inlet flange which extends parallel to the longitudinal axis and along which the movable piston slides,
    means for conveying cleaning fluid through the hollow body, from a fluid inlet nozzle to the distribution element, comprising at least one inlet chamber whose volume varies as a function of the movement of the movable piston and a distribution duct formed in the movable piston,
    - The piston and / or the rod are configured to provide between them cleaning fluid passage channels.
    The cleaning device according to the invention is characterized in that at least two passage channels have axial dimensions, along the axis
    WFR2643 longitudinal, different.
    According to the invention, the “means of conveying” the cleaning fluid include all of the conduits, intake chambers and / or passage channels which make it possible to bring the cleaning fluid from the inlet or zone of admission to the distribution element. These conveying means contain at least one distribution duct formed in the movable piston, which preferably consists of two portions of different diameters. The enlarged upper part of the distribution conduit is defined so as to allow the rod to slide in the movable piston while the lower part of said conduit allows, by its smaller diameter, to pressurize the fluid so as to eject it. this on the optical sensor for cleaning.
    According to the invention, "the means of displacement" of the piston are formed at least in part by the means for conveying the fluid, in particular by the pressure of said cleaning fluid exerted on said piston.
    According to different characteristics of the invention, taken alone or in combination, it can be provided that:
    - the passage channels are arranged parallel to the longitudinal axis;
    - each passage channel has a separate axial dimension from that
    0 neighboring channels;
    - at least two passage channels have variable radial dimensions;
    - at least one passage channel is interrupted along the longitudinal dimension; the passage channels may stop and then
    5 restart, so that the longitudinal fluid passage between the rod and the piston is interrupted, at the location of these channelless portions.
    By the expression "axial dimension" is meant the height of a passage channel, in the direction of the longitudinal axis of extension of the movable piston, while by "radial dimension" is meant the depth
    0 of said channel, in the thickness of the part of the movable piston and / or of the rod in which the passage channels can be formed.
    WFR2643
    The passage channels can be formed by grooves made in the movable piston and / or in the rod, and covered by the rod, respectively by the piston. The particular arrangements and sizing of the grooves forming the passage channels make it possible to vary the fluid flow rate by having more or less large passage sections. It is therefore understood that the cleaning fluid will flow primarily through the passage channel having the largest axial dimension. Whatever the geometries and radial dimensions of the passage channels, it is necessary to maintain a sufficient range between two consecutive channels in order to allow optimal guidance of the piston around the rod.
    According to another series of characteristics, it can be predicted that:
    - The passage channel which has the largest axial dimension has the smallest radial dimension; it is therefore understood that the increase in the radial dimension of a passage channel makes it possible to increase the flow rate of the fluid; it is particularly advantageous to be able to increase the fluid flow rate projected by the projection element on the optical sensor when the projection element is correctly deployed;
    - The cleaning device comprises at least three passage channels;
    - the passage channels are arranged in series around the longitudinal axis, with a progressive evolution of the axial dimensions of the passage channels from the start to the end of the series.
    In a preferred embodiment of the cleaning device, the latter comprises a fluid intake nozzle formed projecting from the inlet flange and eccentric with respect to the longitudinal axis on which the hollow body is centered. The fluid inlet nozzle opens inside the hollow body into an inlet chamber delimited at least in part by the inlet flange, a peripheral wall of the hollow body and by the movable piston.
    The passage channels can in particular be formed by a groove formed in the movable piston and covered, entirely in the extreme retracted position and partially in the other relative positions of the piston and
    WFR2643 of the rod, by the rod. More specifically, the grooves can be formed on the internal wall of the piston delimiting the distribution duct, these grooves opening onto the intake chamber.
    Advantageously, the means for moving the piston comprise, in addition to the means for conveying the fluid capable of pressurizing said cleaning fluid, elastic means for returning to the position, housed in the hollow body so as to tend to return to the rest position. said piston. Preferably, the elastic return means are housed in the hollow body to bear against the hollow piston, opposite the inlet chamber, îo In one embodiment, the elastic return means are constituted at least one compression spring able to deform under the effect of the pressure of the cleaning fluid so as to promote the longitudinal displacement of the hollow piston. It is thus understood that in the fluid loading phase in the device, the hollow piston moves opposite the intake chamber and then performs a reverse return path at the end of the cleaning phase by ejection of the fluid. .
    According to a series of characteristics, we can predict that:
    - The hollow piston has a substantially cylindrical central part, capable of sliding within a hollow guide sleeve provided at
    0 the end of the hollow body opposite the inlet flange, a terminal distribution part extending the central part and at the free end of which the distribution element is capable of being fixed, and an intake part extending the central part opposite the terminal distribution part and configured to slide inside said hollow body;
    5 - the passage channels respectively have a groove formed in the piston along the intake part;
    - The terminal distribution part of the piston is arranged so that the distribution conduit formed in the piston can communicate with a distribution channel of the distribution element;
    0 - the piston comprises, in the vicinity of its upstream end, a crown, against a face of which can bear the elastic return means; preferably, said crown has a peripheral groove
    WFR2643 arranged in its outer wall and capable of accommodating a sealing element, such that the piston equipped with said element can slide in leaktight manner within the hollow body;
    - A peripheral groove can be arranged at a free end of the rod, 5 to receive a seal, so that the rod, fitted with said seal, can slide in leaktight manner in the central part of the piston.
    According to another characteristic of the invention and with the aim of being part of an overall hydraulic diagram, the cleaning device of a sensor can comprise, in addition to the intake nozzle, the hollow body, the rod and the mobile piston carrying the passage channels, a reservoir for storing the cleaning fluid, and elements for controlling the circulation of cleaning fluid between the reservoir and the intake nozzle. Said control elements can consist of a pump and optionally of a solenoid valve and are configured to block the admission of cleaning fluid into the intake nozzle in a rest position, to supply the nozzle of cleaning fluid inlet in order to move the dispensing element into a cleaning position on the one hand and to spray cleaning fluid on the other hand, and to block the cleaning fluid in the inlet chamber and the cleaning channel
    0 dispensing and keep the dispensing element in the cleaning position.
    When integrated into the hydraulic system, the solenoid valve is a 3-way solenoid valve able to allow or stop the passage of a pressurized fluid in three different positions in order to allow circulation from the pump to the cylinder or prevent any traffic or
    5 allow the return of liquid from the cylinder to the reservoir.
    A second object of the invention relates to a motor vehicle equipped with an optical detection assembly characterized in that it comprises at least one cleaning device as previously described, intended to spray at least one fluid towards a surface to be cleaned d a motor vehicle, such as a sensor
    0 optics of an optical detection system for vehicle.
    Other features, details and advantages of the invention and its
    WFR2643 operation will emerge more clearly on reading the description given below for information, in relation to the appended figures, in which:
    - Figure 1 is an exploded perspective view of a cleaning device according to the invention, intended to project at least one fluid towards a surface to be cleaned of a motor vehicle, such as an optical sensor of a optical detection, the cleaning device comprising at least one movable piston sliding in a hollow body along a fixed rod and carrying at one end a fluid distribution element;
    - Figure 2 is a sectional view of the piston of the device of the invention, îo along a plane perpendicular to the longitudinal axis (X) of Figure 1, at an end portion opposite to the end carrying the fluid distribution element, illustrating an exemplary embodiment and distribution of passage channels arranged circumferentially on an interior wall of said piston;
    - Figure 3 is a sectional view, in a sectional plane comprising the longitudinal axis (X), of the cleaning device of Figure 1 when the movable piston is in the retracted extreme position, or rest position, and the Figure 3a is a detail view of the free end of the rod around which the piston slides in this retracted rest position;
    - Figure 4 is a sectional view, in the same section plane as that 20 of Figure 3, of the cleaning device of Figure 1, in a first intermediate position in which the cleaning fluid is allowed to pass to the interior of the movable piston through a limited quantity of passage channels, and FIG. 4a is a detail view of the free end of the rod around which the piston slides in this first intermediate position;
    5 - Figure 5 is a sectional view, in the same section plane as that of Figure 3, of the cleaning device of Figure 1, in a second intermediate position in which the cleaning fluid is allowed to pass to the inside of the movable piston through a large quantity of passage channels, and FIG. 5a is a detail view of the free end of the rod around
    0 which slides the piston in this second intermediate position;
    - Figure 6 is a sectional view, in the same section plane as that of Figure 3, of the cleaning device of Figure 1, when the movable piston is in the extreme deployed position;
    WFR2643
    - Figure 7 is a schematic representation of the hydraulic architecture associated with the cleaning device according to the invention;
    - Figure 8 shows a first example of evolution of the flow of a cleaning fluid during a movement of the movable piston between an extreme retracted position, at rest, and an extreme deployed position;
    - Figure 9 shows a second example of change in the flow of a cleaning fluid during a movement of the movable piston between an extreme retracted position, at rest, and an extreme deployed position, in a particular case where the one of the passage channels is interrupted; and
    - Figure 10 is an overview of a support element of an optical detection system and an associated cleaning device, as it can be mounted on a body element of a motor vehicle.
    It should first of all be noted that if the figures show the invention in detail for its implementation, they can, of course, be used to better define the invention if necessary. It will also be understood that the embodiment of the invention illustrated by the figures is given by way of non-limiting example. Consequently, other configurations of the device according to the invention can be achieved, in particular by variations in the arrangement, distribution and axial and / or radial dimensioning of the passage channels, which will necessarily impact the flow rates of the cleaning fluid. and associated pressures.
    It is also recalled that, in the description which follows, the names upstream and downstream refer to the direction of flow of the cleaning fluid in the cleaning device according to the invention. Thus, the upstream designation refers to the side of the device according to the invention by which this cleaning fluid is admitted therein, and the downstream designation refers to the side of the device according to the invention by which the cleaning fluid is distributed to outside thereof, towards a surface of an optical sensor of an optical detection assembly of a motor vehicle.
    FIG. 1 illustrates a cleaning device 100 intended according to the invention for spraying at least one fluid towards a surface to be cleaned of a motor vehicle, such as an optical sensor 30, and FIG. 10 also illustrates a view
    WFR2643 of a support element 101 configured to receive an optical sensor 30 and a cleaning device 100 juxtaposed.
    The cleaning device essentially consists of upstream to downstream along a longitudinal axis (X) of elongation of the cleaning device, a fluid inlet nozzle 11, a flange d inlet 2, a rod 10 integral with the inlet flange 2, a piston 3, an elastic return means in position 4 and a distribution element 8, 9. Each of these components is housed inside, or fixed at one end, a hollow body 1 of revolution about a longitudinal axis (X).
    îo The fluid inlet nozzle 11 is formed projecting from the inlet flange
    2, and it extends opposite the hollow body, being here eccentric with respect to the longitudinal axis (X) of the hollow body 1. The inlet nozzle 11 has a longitudinal bore passing through and opening at the inside the hollow body 1 in an inlet chamber 14 (visible in particular in FIGS. 4 to 6) delimited at least in part by the inlet flange 2, a peripheral wall of the hollow body 1 and by the movable piston 3.
    The inlet flange 2 is configured to close the upstream end of the hollow body 1. A sealing member 5 can be provided at this closure. The inlet flange is configured to support the rod 10 on its internal face,
    0 facing the inside of the hollow body.
    The rod 10 extends projecting from the inlet flange 2, inside the hollow body 1. The rod has a cylindrical shape with circular section, the outer peripheral face of which is smooth. The free end 15 of the rod 10, which extends opposite the inlet flange 2, has a peripheral groove 23 adapted to
    5 accommodate an O-ring seal 6 so as to allow the sealed sliding of the rod 10 in the piston 3. As will be described below, the O-ring seal 6 is configured to bear against an internal face of the piston so that the fluid is blocked upstream of the O-ring between the rod and the piston, since grooves made in the piston do not
    0 do not allow fluid to escape to the dispensing element.
    The piston 3 carries at a first end, or downstream end, of a
    WFR2643 dispensing element 8, 9 of cleaning fluid constituted in the illustrated example of two complementary parts in L shape.
    The piston 3 comprises, in the vicinity of its upstream end, that is to say the end facing the inlet flange 2, a ring 21 on the outer wall of which is arranged a peripheral groove 22, capable of accommodating a sealing element 7 so as to allow the sealed sliding of the piston 3 in the hollow body 1. The sealing element 7 is preferably a lip seal, capable of limiting the friction of the piston 3 in the hollow body 1 .
    The piston is hollowed from one end to the other by an internal conduit for the circulation of the cleaning fluid. The specific internal shape of the piston here will be described in more detail below, in particular in that it has a plurality of grooves configured to form passage channels of variable lengths which allow a passage of liquid with controlled flow.
    The movable piston 3 slides in the hollow body 1 between an extreme retracted position, or rest position (visible in FIG. 3), and an extreme deployed position, or cleaning position (visible in FIG. 6).
    The cleaning fluid is injected into the hollow body via the intake nozzle and is then ejected through the dispensing orifices. Means for conveying the cleaning fluid through the hollow body 1, from the inlet nozzle 11 of fluid to the distribution element 8, 9, comprise at least the inlet chamber 14 and a conduit distribution valve 13 (visible in FIGS. 3 to 6) formed in the movable piston 3.
    The elastic return means 4, preferably a helical spring, is arranged in the hollow body between the peripheral wall and the piston, so as to
    5 bear at one end on the bottom of the body and at the opposite end on one face of the crown 21.
    The piston is mounted in the hollow body around the rod 10 which extends substantially coaxially with the movable piston 3, so that at least the free end 15 of the rod 10 extends inside the conduit internal of
    0 distribution 13 of the movable piston 3. The hollow piston 3 has portions
    WFR2643 substantially cylindrical which can be defined, from upstream to downstream, as being an intake portion 19 carrying the crown 21, a central portion 16 capable of sliding within a hollow guide sleeve 18 formed at the downstream end of the hollow body 1 and a distribution end portion 17, of smaller diameter, at the free end of which the distribution element 8, 9 is capable of being fixed. The distribution conduit 13 formed in the movable piston consists of at least two portions of different diameters, among which a first proximal portion 131 extending from an upstream end of the conduit, that is to say an opening end on the inlet chamber 14, and a second distal part 132 extending from the downstream end of the duct. As illustrated in FIGS. 3 to 6, a narrowing zone 130 is arranged between the proximal and distal portions of different diameters.
    The enlarged first proximal part 131 of the distribution conduit 13 is defined so as to allow the relative sliding of the rod 10 relative to the movable piston 3 while the second lower part of said conduit 13 allows, by its smaller diameter and the narrowing zone which follows, to pressurize the fluid so as to eject it on the optical sensor 30 for cleaning. The terminal distribution part 17 of the piston 3 is arranged so as to cooperate with the upstream portion 8 of the element
    0 distribution so that the second lower part of the distribution duct 13 can communicate with a distribution channel 20 formed in the distribution element 8, 9.
    The piston 3 and / or the rod 10 are configured to provide passage channels 12 between them which allow the flow of cleaning fluid from the inlet chamber 14 (visible in FIG. 3), the variable volume of which is defined depending on the position of the piston 3 relative to the inlet flange 2. The passage channels 12 are obtained by grooves 120 made in the outer wall of the rod, respectively in the inner wall 31 of the piston, these grooves being closed by the piston, respectively the rod. In the mode of
    0 embodiment illustrated in FIG. 1, the passage channels are each formed by a groove 120 formed in the internal wall of the piston 3 delimiting the internal distribution duct 13 along the intake portion 19 and closed by the covering of the smooth outer peripheral face of the rod 10.
    WFR2643
    The intake portion 19 thus has grooves 120 while the central portion 16 of the piston is smooth. The relative sliding of the piston with respect to the rod is thus a sealed sliding, preventing the passage of fluid, when the O-ring seal 6 formed in the free end part 15 of the rod 10 is located in the central part 16 of the piston and therefore carries continuously on the periphery of the piston, while it consists of a permeable sliding, allowing the passage of fluid, when the O-ring seal 6 is located in the intake part 19.
    According to an essential characteristic of the invention, the grooves 120 i participating in forming the passage channels 12 have different dimensions from each other, and in particular different longitudinal dimensions, so as to be able to control the gradual arrival of cleaning fluid. in the distribution element 8.9.
    FIG. 2 illustrates an embodiment of the invention and presents an example of arrangement, distribution and dimensioning of the grooves 120 forming the passage channels 12 formed on the interior wall 31 of the piston
    3. A sufficient range 121 is maintained between two consecutive grooves. By sufficient range is meant that whatever the configuration of the grooves and their number, the rod and the piston have a contact surface
    0 large enough compared to the holes left by the grooves, to allow stable guidance of the piston around the rod. In this example, eight channels are formed by the association of one of the eight grooves formed in the interior wall 31 of the piston 3 and of the rod bearing against this interior wall. In a variant not illustrated, provision may be made for the passage channels to be
    5 formed by grooves formed on the outer peripheral face of the rod and by the inner wall of the piston overlapping these grooves, it being understood that it is important according to the invention that the grooves participating in forming the passage channels are of different lengths for at least two of them.
    0 According to the invention, these grooves 120 forming the passage channels 12 are configured such that one of these grooves has an axial dimension, that is to say a dimension along the longitudinal axis (X) , distinct from the
    WFR2643 axial dimension of at least one other of the grooves. We will be able to describe below a possible configuration of the different heights, or axial dimensions, of the grooves participating in forming the fluid passage channels of a cleaning device according to the invention.
    These grooves 120 extend axially, between a proximal end 122, opening onto an end face 210 of the ring 21 which participates in delimiting the inlet chamber 14, and a distal end 123, in the thickness of the movable piston3 and extending to a determined axial dimension of this proximal end face 210 of the ring 21.
    These grooves 120 participating in forming the passage channels 12 can also have variable radial dimensions or depths. We can in particular provide that the groove which has the largest axial dimension has the smallest radial dimension, it being understood that the increase in the radial dimension of a passage channel makes it possible to increase the flow rate of passage of the fluid provided by this passage channel. It is particularly advantageous to be able to increase the flow rate of fluid projected by the projection element on the optical sensor when the projection element is correctly deployed.
    We will now describe in more detail an example of deployment
    0 controlled of the dispensing element in the cleaning device according to the invention, with particular reference to Figures 3 to 6, which illustrate successive stages of deployment.
    FIG. 3 illustrates the cleaning device of the invention in a first rest position, according to which the dispensing element 8, 9 is in
    5 retracted position and housed in the lower part of the body of the cleaning device 100. The piston is then arranged so that the inlet portion 19 is pressed against the inlet flange, the inlet chamber 14 then being reduced to a minimum volume. In this rest position, the elastic return means is in the uncompressed state defining the free length of the
    0 spring 4.
    It is notable that in this rest position, the free end 15 of the rod
    WFR2643 extends deep into the internal distribution duct 13 formed in the movable piston, so that this free end 15 of the rod is located substantially in the vicinity of the narrowing zone 130. In this position of rest, the grooves 120 arranged in the piston 3 are completely covered by the rod 10 so that at the distal end 123 of each of these grooves, the passage channels are closed. The presence of the O-ring seal 6, arranged in the peripheral groove 23 of the rod and dimensioned to rub against the internal wall of the piston, makes it possible to ensure sealing and to prevent the passage of fluid towards the element of distribution.
    îo In this rest position, fluid is injected into the cleaning device when a cleaning action of an optical sensor is commanded. The fluid is distributed between the inlet flange and the movable piston, in the inlet chamber 14, and is also inserted into the passage channels, each groove forming a passage channel having a free proximal end 123 which opens out. on the end face 210 of the ring 21, and which is therefore accessible from the intake chamber. As just described, the grooves are covered by the piston in this intermediate position and the fluid entering the channels remains blocked there.
    Figure 4 illustrates the cleaning device according to the invention in a
    0 first intermediate position between the rest position and the extreme deployed position. This first intermediate position is obtained following the sliding of the piston along the rod, under the effect of the pressure of the cleaning fluid, in particular against the crown 21 of the piston 3, of the cleaning fluid continuing to be injected by the nozzle. of admission. In this first intermediate position, the piston slid along the rod so that the free end 15 of the rod 10 has moved away from the narrowing zone 130: the seal 6 is no longer at the level from the central part 16 of the piston but at the level of the admission part 19 in which the grooves 120 extend. The rod and the O-ring 6 no longer cover the distal end 123
    0 of the groove 120 having the largest axial dimension, the O-ring being disposed between this clear distal end and the end face 210 of the crown 21. The cleaning fluid present in this groove can then infiltrate in the distribution duct 13, as illustrated by the arrow F1
    WFR2643 visible in FIG. 4, and fluid can flow from the inlet chamber 14 to the distribution element 8, 9 via the only passage channel whose distal end is not covered. This results in a passage of fluid at a reduced fluid flow rate, substantially equal to 1 / n, n being the number of passage channels arranged between the rod and the piston, here eight in number.
    FIG. 5 illustrates a second intermediate position between the extreme rest position and the extreme deployed position, in which the cleaning fluid is authorized to pass inside the movable piston through the channels, a large proportion of which, here five on eight, is discovered at its distal end. In this second intermediate position, the piston has slid further along the rod so that the free end 15 of the rod 10 has approached the upstream end of the duct, that is to say the end leading to the intake chamber 14. The seal 6 is located at the intake part 19 in which the grooves 120 extend, with the rod and the O-ring 6 which do not cover plus the distal end of five of the grooves 120, that is to say the distal end of the five grooves having the largest axial dimension. The fluid can circulate from the inlet chamber 14 to the distribution element 8.9 by the five corresponding passage channels and this results in a passage of fluid at an intermediate flow rate,
    0 substantially equal to 5 / n, n being the number of passage channels arranged between the rod and the piston, here eight in number.
    FIG. 6 illustrates the extreme deployed position, that is to say the position of maximum deployment of the device for cleaning and total ejection of the fluid by virtue of the increase in the flow rate to 100% by passage of fluid in each of the
    5 passage channels 12. The back pressure exerted by the spring 4 and / or the abutment of the crown 21 of the piston against the hollow guide sleeve 18 makes it possible to limit the displacement of the rod relative to the piston and prevent the rod does not escape from the distribution duct 13 formed in the piston 3. In this stop position, the distal end of each of the channels is released and
    0 the seal 6 only has the effect of blocking the passage of fluid between the two internal and external walls of the piston and of the rod, without hindering the passage in the grooves. The dispensing element 8, 9 is then fully deployed outside the cleaning device so as to adopt an optimal position of
    WFR2643 cleaning the optical sensor 30, and the fluid ejection rate is then maximum.
    Thanks to the different axial dimension of the grooves, it is thus possible to control the ejection rate as a function of the deployment of the distribution element and of the position of the fluid jet on the resulting optical sensor.
    At the end of this cleaning phase by ejecting all of the fluid, the piston, after having moved away from the intake chamber, performs a reverse return path under the combined effect of the return of the spring and the fluid supply stop via the intake nozzle, the spring then pushing the piston back to its original position by pushing the remaining fluid out of the intake chamber and out of the hollow body. It should be noted that the axial offset of the distal ends of the grooves makes it possible to avoid the presence of too sudden excess pressure when the piston returns to the position in the hollow body.
    FIG. 7 schematically illustrates the overall hydraulic architecture 15 associated with the cleaning device 100 which may comprise, in addition to the inlet nozzle 11, the hollow body 1, the rod 10 and the movable piston 3 carrying the passage channels with axial dimensions different, a storage tank 24 for cleaning fluid and elements for controlling the circulation of cleaning fluid between the tank 24 and the inlet nozzle 11 of said
    0 cleaning 100, which is here schematically represented by a jack. Said control elements can consist of a pump 25 and optionally of a solenoid valve 26.
    It is understood that at the end of the cleaning phase by ejecting all of the fluid, the fluid, under the effect of the return of the piston pushed by the spring into the rest position, passes through the intake nozzle then returns to the pump and to the storage tank.
    FIG. 8 illustrates the variation in the cleaning fluid flow rate projected onto an optical sensor as the movable piston moves between a retracted rest position and an extreme deployed position. We can note
    0 that unlike what would have been the case with a device of the prior art, with which the variation at the start would have taken the form of a niche on / off, with a
    WFR2643 flow at 0% before obtaining a single intermediate position in which the piston no longer covers the end of the grooves and a flow at 100% after the passage of this single intermediate position, here we have a progressive evolution in stages , enabled by the variation of the axial dimension from one passage channel to another.
    In this example, it should be noted that:
    - A first passage channel 12a has a greater axial dimension than that of the others;
    - A second passage channel 12b, not necessarily arranged in the direct vicinity of the first channel in the arrangement in circular series of the channels, has an axial dimension less than that of the first passage channel but greater than that of the other channels;
    a third passage channel 12c, not necessarily in the direct vicinity of the second channel in the circular series arrangement of the channels, has an axial dimension less than that of the second passage channel but greater than that of the channels other than the first and the second;
    - a fourth channel 12d and a fifth channel 12e, not necessarily directly adjacent in the arrangement in circular series of the channels, have equal axial dimensions, and less than that of the first three channels
    0 passage; and
    - a sixth channel 12f, a seventh channel 12g and an eighth channel 12h, not necessarily directly adjacent in the arrangement in circular series of the channels, have axial dimensions equal to each other, and less than that of all the other passage channels.
    5 In this example, it is understood that when the movable piston is in the rest position, and until it reaches the first intermediate position, no passage channel is discovered and the liquid is blocked, so that the flow rate of fluid passage to the distribution element 8.9 is zero. In the first intermediate position, only the first passage channel,
    0 i.e. the channel with the longest axial dimension, sees its
    WFR2643 end exposed by the relative position of the piston with respect to the rod, and the cleaning fluid present in this first passage channel 12a can flow to the distribution element via the internal channel 13 of the piston: in an exemplary embodiment where the eight passage channels each have the same depth, that is to say the same radial dimension, the flow of cleaning fluid passing towards the dispensing element is substantially equal to 1/8 th . It is understood that as the piston advances along the rod, the passage channels are discovered successively from the highest, that is to say the one having the largest axial dimension, at least high , the flow rate of cleaning fluid increasing. In the second intermediate position illustrated in FIG. 5, in which the first five passage channels are discovered, for example, in the order of their axial magnitude, it is understood that the flow of cleaning fluid is substantially equal to 5/8 th . We can thus see an evolution by level of the flow passing from cleaning fluid to the distribution element, with in the example illustrated in FIG. 8, a first level at 12.5%, a second level at 25%, a third level at 37.5%, a fourth level at 62.5% and a final level at 100%. The progressive evolution on the first bearings allows a loading and priming phase of a reduced flow, while the evolution is faster on the end of the piston movement,
    0 when the cleaning device is in the optimal position to clean the optical sensor.
    FIG. 9 illustrates another exemplary embodiment in which one of the passage channels has an interruption substantially in the middle. As will be described below, this arrangement allows to play on the quantity
    5 of fluid sprayed relative to the deployment of the movable piston and therefore of the cleaning device. We can note that the evolution between the flow at 0% and the flow at 100% is overall, as it was presented in the first example of embodiment in Figure 8, progressive in stages, but with a break in the middle of this progression before to take it back.
    In this exemplary embodiment, it should be noted that the first three passage channels 12a to 12c are similar to those previously described, as well as the last four passage channels 12e to 12h. On the other hand, the fourth channel 12d differs in that the groove is interrupted so as to form a
    WFR2643 neutral zone 120d in which the wall of the rod and / or of the piston is not machined.
    It can thus be seen, in the example illustrated in FIG. 9, an evolution by level of the flow passing from cleaning fluid to the dispensing element, with initially a progressive evolution, with a first level at 12.5 %, a second plateau at 25% and a third plateau at 37.5%, then a declining trend with a return to the second plateau at 25%, so as to limit the projection of fluid in this initiation of displacement of the mobile piston, and finally a new progressive evolution, with a jump to a fourth level 62% then a final level to 100%. In this last phase of evolution, the increase is more brutal, the jump from the second level to the fourth level being more marked. This ensures, thanks to this rupture in the passage channel, a jet of pressurized fluid allowing, while the movable piston is in an intermediate position sufficiently deployed, more effective cleaning.
    The foregoing description clearly explains how the invention makes it possible to achieve the objectives which it has set itself, and in particular to propose a device for cleaning an optical sensor of a motor vehicle which, by an arrangement, a distribution and a particular dimensioning of channels of
    0 passage of cleaning fluid, allows sequencing the filling with fluid by controlling the flow of said fluid and the associated pressure and therefore optimizing the consumption of fluid and improving the cleaning efficiency of the optical sensor. The present invention is not limited to the embodiments given by way of nonlimiting examples.
    WFR2643
    权利要求:
    Claims (14)
    [1]
    1. Cleaning device (100), intended to project at least one fluid towards a surface to be cleaned of a motor vehicle, such as an optical sensor of a
    5 optical detection system, the cleaning device comprising at least:
    - a hollow body (1) closed at one end by an inlet flange (2),
    - a movable piston (3) sliding along a longitudinal axis (X) in the hollow body (1) and carrying at one end of a dispensing element (8, 9) of cleaning fluid, the piston being movable between an extreme retracted position and an extreme deployed position,
    - a rod (10) integral with the inlet flange (2) which extends parallel to the longitudinal axis (X) and along which the mobile piston (3) slides,
    - means for conveying cleaning fluid through the hollow body (1), from a fluid inlet nozzle (11) to the element
    15 distribution (8, 9), comprising at least one inlet chamber (14) whose volume varies depending on the movement of the movable piston (3) and a distribution conduit (13) formed in the movable piston (3) ,
    the piston (3) and / or the rod (10) being configured to provide passage channels (12) for cleaning fluid therebetween,
    [2]
    2 0 characterized in that at least two passage channels (12) have different axial dimensions, along the longitudinal axis (X).
    2. Cleaning device according to claim 1, characterized in that the passage channels (12) are arranged parallel to the longitudinal axis (X).
    [3]
    3. Cleaning device according to one of claims 1 or 2, characterized
    2 5 in that each passage channel (12) has an axial dimension distinct from that of the neighboring channels.
    [4]
    4. Cleaning device according to any one of claims 1 to 3, characterized in that at least two passage channels (12) have variable radial dimensions.
    5 0 5. Cleaning device according to the preceding claim, characterized in
    WFR2643 that the passage channel (12) which has the largest axial dimension has the smallest radial dimension.
    6. Cleaning device according to one of the preceding claims, characterized in that at least one passage channel (12) is interrupted along
    [5]
    5 of the longitudinal dimension (X).
    [6]
    7. Cleaning device according to any one of the preceding claims, characterized in that the passage channels (12) are arranged in series around the longitudinal axis (X), with a progressive evolution of the axial dimensions of the passage channels (12) from the beginning to the end of the series.
    îo
    [7]
    8. Cleaning device according to any one of the preceding claims, characterized in that the passage channels (12) respectively have a groove (120) formed in the movable piston (3) and / or in the rod (10).
    [8]
    9. Cleaning device according to the preceding claim, characterized in
    15 that the grooves (120) are formed on the internal wall of the piston (3) delimiting the distribution duct (13), these grooves opening onto the intake chamber (14).
    [9]
    10. Cleaning device according to any one of the preceding claims, characterized in that means for moving the piston (3)
    2 0 comprise, in addition to the means for conveying the fluid, elastic means (4) housed in the hollow body (1) so as to tend to return the mobile piston (3) to the extreme rest position.
    [10]
    11. Cleaning device according to any one of the preceding claims, characterized in that the hollow piston (3) has a part
    2 5 central (16) substantially cylindrical, capable of sliding within a hollow guide sleeve (18) formed at the end of the hollow body (1) opposite the inlet flange (2), an end portion of distribution (17) extending the central part (16) and at the free end of which the distribution element (8, 9) is
    WFR2643 suitable for being fixed, and an intake part (19) extending the central part (16) opposite the terminal distribution part (17) and configured to slide inside the hollow body (1).
    [11]
    12. Cleaning device according to the preceding claim, characterized in 5 that the passage channels (12) respectively have a groove (120) formed in the piston (3) along the intake part (19).
    [12]
    13. Cleaning device according to any one of claims 11 or 12, characterized in that a peripheral groove (23) is arranged at a free end (15) of the rod (10), to receive a seal (6), so that the rod (10), fitted with said seal (6), can slide in leaktight manner in the central part (19) of the piston (3).
    [13]
    14. Motor vehicle equipped with an optical detection system and an associated optical sensor, characterized in that it comprises at least one cleaning device according to any one of the preceding claims, intended for
    [14]
    15 projecting at least one fluid towards a surface of the optical sensor to be cleaned.
    Î X
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    同族专利:
    公开号 | 公开日
    EP3519262B1|2021-06-16|
    JP2019529234A|2019-10-17|
    FR3056518B1|2018-10-26|
    CN109906179A|2019-06-18|
    US20190217823A1|2019-07-18|
    JP6949948B2|2021-10-13|
    US10870415B2|2020-12-22|
    WO2018059805A1|2018-04-05|
    EP3519262A1|2019-08-07|
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    FR3021014A1|2014-05-14|2015-11-20|Coutier Moulage Gen Ind|TELESCOPIC WASHING DEVICE|WO2020127359A1|2018-12-18|2020-06-25|Fico Transpar, S.A.|Fluid dispensing system|FR2675758B1|1991-04-25|1993-08-20|Valeo Vision|DEVICE FOR WASHING THE WINDOW OF A MOTOR VEHICLE PROJECTOR.|
    DE19531403A1|1995-08-26|1997-02-27|Hella Kg Hueck & Co|Windscreen washer device for motor vehicles, in particular vehicle headlights|
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    DE10111757A1|2001-03-12|2002-09-19|Volkswagen Ag|Wiper blade for vehicle windscreens, comprises a single element composed of a wiper lip, a spring rail and an air guide profile|
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    FR3027008B1|2014-10-10|2017-12-08|Valeo Systemes Dessuyage|DEVICE FOR CLEANING A DRIVING CAMERA FOR DRIVING A MOTOR VEHICLE|
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    FR3039114B1|2015-07-22|2017-07-28|Valeo Systemes D'essuyage|DEVICE FOR CLEANING A SENSOR FOR A MOTOR VEHICLE|
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    CN105059252B|2015-08-13|2018-07-31|广州飞歌汽车音响有限公司|Vehicle-mounted reverse image cleaning device and its application method|
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    US10532368B2|2016-07-22|2020-01-14|Fico Transpar, S.A.|Fluid ejection device|
    FR3056520B1|2016-09-28|2019-08-09|Valeo Systemes D'essuyage|DEVICE FOR CLEANING AN OPTICAL SENSOR OF AN OPTICAL DETECTION SYSTEM FOR A MOTOR VEHICLE|
    FR3065381B1|2017-04-25|2020-10-30|Valeo Systemes Dessuyage|TELESCOPIC CLEANING DEVICE|FR3065380B1|2017-04-25|2019-06-21|Valeo Systemes D'essuyage|TELESCOPIC CLEANING DEVICE|
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    法律状态:
    2017-09-29| PLFP| Fee payment|Year of fee payment: 2 |
    2018-03-30| PLSC| Search report ready|Effective date: 20180330 |
    2018-09-28| PLFP| Fee payment|Year of fee payment: 3 |
    2019-09-30| PLFP| Fee payment|Year of fee payment: 4 |
    2020-09-30| PLFP| Fee payment|Year of fee payment: 5 |
    2021-09-30| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1659181A|FR3056518B1|2016-09-28|2016-09-28|DEVICE FOR CLEANING AN OPTICAL SENSOR OF AN OPTICAL DETECTION SYSTEM FOR A MOTOR VEHICLE|
    FR1659181|2016-09-28|FR1659181A| FR3056518B1|2016-09-28|2016-09-28|DEVICE FOR CLEANING AN OPTICAL SENSOR OF AN OPTICAL DETECTION SYSTEM FOR A MOTOR VEHICLE|
    US16/336,405| US10870415B2|2016-09-28|2017-08-07|Device for cleaning an optical sensor of an optical detection system for a motor vehicle|
    CN201780068430.9A| CN109906179A|2016-09-28|2017-08-07|For cleaning the device for being used for the optical sensor of Systems for optical inspection of motor vehicles|
    EP17752085.5A| EP3519262B1|2016-09-28|2017-08-07|Device for cleaning an optical sensor of an optical detection system for a motor vehicle|
    JP2019516713A| JP6949948B2|2016-09-28|2017-08-07|A device for cleaning the optical sensors of optical detection systems for automatic vehicles|
    PCT/EP2017/069895| WO2018059805A1|2016-09-28|2017-08-07|Device for cleaning an optical sensor of an optical detection system for a motor vehicle|
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