• 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 cylinder (100, 200, 300), in particular for use in a hydraulic system, with a cylinder housing (102, 202) with a cylindrical side wall (103, 203); with a piston (101, 201) disposed axially slidably in the cylinder housing (102, 202); with a plurality of transmitting devices (1061 - 5061, 1062 - 5062, 1063 - 5063) which are arranged on the cylinder housing (102, 202) and are arranged to receive ultrasonic signals (108) in the side wall (103, 203) of the cylinder housing ( 102, 202); wherein a control device (111) with which the plurality of transmitting devices (1061 - 5061, 1062 - 5062, 1063 - 5063) are controllable such that the input into the side wall (103, 203) of the cylinder housing (102, 202) ultrasonic signals (108) overlap such that a signal at the position of the piston (101, 201) is above a predetermined threshold value.
    公开号:NL2018424A
    申请号:NL2018424
    申请日:2017-02-24
    公开日:2017-09-06
    发明作者:Chabaud Antoine；Gerlach Andre；Hahn-Jose Thomas
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    Cylinder and method for determining a position of a piston in a cylinder
    The present invention relates to a cylinder, in particular for use in a hydraulic system, and a method for determining a position of a piston in a cylinder, in particular for use in a hydraulic system.
    State of the art
    Various measurement methods are known for measuring a position of a piston in a cylinder, in particular a hydraulic cylinder. Method based on transit time measurements of ultrasonic signals is characterized by a high robustness and does not require piercing of the piston. For example, a measuring method is known from US 6 119 579 A, wherein ultrasonic sensors are arranged outside on a cylinder and the position of the piston is determined on the basis of the travel time of the ultrasonic measuring signals.
    Revelation of the invention
    The present invention relates to a cylinder, in particular for use in a hydraulic system, with the features of claim 1 and a method for determining a position of a piston in a cylinder, in particular for use in a hydraulic system with the features of claim 12.
    To this end, according to a first aspect, the present invention provides a cylinder, in particular for use in a hydraulic system, with a cylinder housing with a cylindrical side wall; with a piston arranged axially displaceable in the cylinder housing; to insert ultrasonic signals into the side wall of the cylinder housing with a plurality of transmitting devices which are arranged on the cylinder housing and are arranged; wherein a control device with which the plurality of transmitting devices can be controlled such that the ultrasonic signals introduced into the side wall of the cylinder housing overlap such that a signal at the position of the piston is above a predetermined threshold value.
    To this end, according to a second aspect, the present invention provides a method for determining a position of a piston in a cylinder, in particular for use in a hydraulic system. The method comprises driving a plurality of transmitting devices for inputting ultrasonic signals into a side wall of a cylinder housing of the cylinder, the input ultrasonic signals overlapping such that a signal at the position of the piston above a predetermined threshold value; as well as controlling a plurality of receiving devices for receiving the ultrasonic signals reflected from the piston arranged axially displaceable in the cylinder housing.
    Preferred embodiments are the subject of the respective sub-claims.
    The term "cylinder" includes several piston-cylinder units, in particular a pneumatic cylinder and / or hydraulic cylinder and / or hub cylinder, as they find application in many machines. The cylinder can be filled with any fluid, in particular In addition, the invention is not limited to a specific shape of the cylinder, furthermore, the piston slidably arranged in the cylinder housing can in particular also comprise a diaphragm. transmitter array and / or multiple receiving devices as ultrasonic receiving array are being served.
    It is particularly advantageous that the introduction of ultrasonic waves into the side wall of the cylinder and the extension of ultrasonic waves into the side wall of the cylinder is independent of the operating conditions of the hydraulic oil. This also makes the determination of the piston position in relation to the temperature and age-dependent properties of the hydraulic oil extremely robust. For the rest, an upgrade of transmitting devices, receiving devices and evaluation device for existing cylinders is easily possible.
    The ultrasonic transmitting array can be controlled such that all transmitting devices are operated simultaneously, i.e. without phase difference. This is particularly advantageous if the ultrasonic signals are strongly damped during the expansion and thus a high sound power must be introduced into the cylinder wall.
    Since in each case depending on the number, position and phase of the controlled transmitting devices, further positions occur within the cylinder wall, the ultrasonic signals interfering or destructively destroying. the interference signal being below a predetermined threshold value, it is advantageous if the transmitting devices are controlled in dependence on the expected piston position.
    Furthermore, it is possible that only one transmitting device or few transmitting devices are controlled per measuring cycle and, if necessary, further transmitting devices are connected thereby. This method of control saves electricity and thereby increases the energy efficiency of the system resp. of the method.
    Furthermore, an ultrasonic transmitter array is advantageous on account of its intrinsic redundancy, since it reduces the measurement reliability of the system resp. of the process.
    According to a further embodiment, the cylinder comprises at least one receiving device which is arranged on the cylinder housing and is adapted to receive the ultrasonic signals reflected from the piston. This ensures that the position of the piston resp. ultrasonic signals reflected from the piston seal can be detected and above the travel time, the transmission and reception of the ultrasonic signals is over, and the position of the piston can be determined above the sound speed.
    It is furthermore advantageous if the multiple transmitting devices can be controlled by the driving device such that there is a detectable phase relationship between the ultrasonic signals entered from the multiple transmitting devices in the side wall of the cylinder housing, in particular of 0 ° and 180 °. This phase relationship resp. this phase difference can be chosen such that destructive interference at the position of the piston resp. of the piston seal. The phase difference is expediently chosen such that the interference signal at the position of the piston resp. of the piston seal is above a predetermined threshold value. Because this ensures that it is applied to the piston resp. signal reflected from the piston seal also upon return of the substantially equal path length as can be detected from the input ultrasonic signals from at least one of the plurality of receiving devices.
    According to a further embodiment, the cylinder comprises a plurality of receiving devices, wherein the driving device selects from the plurality of receiving devices at least one receiving device such that a received signal from the at least one selected receiving device is above a predetermined threshold value. This has the advantage that the signal can be detected at least from one of the multiple receiving devices and thereby the position of the piston can be determined.
    For the rest, it is advantageous if the multiple receiving devices can be controlled by the driving device such that the ultrasonic signals reflected from the piston can be received from a predetermined direction. Because this ensures that from several at the position of the piston resp. signals reflected from the piston seal and thus coming from different directions, the signal having the highest intensity can be selected.
    It is furthermore advantageous if the plurality of transmitting devices are arranged on the cylinder housing such that the ultrasonic signals introduced into the side wall of the cylinder housing overlap such that the signal is above a predetermined threshold value at the position of the piston. Because this makes it possible to guarantee that the individual ultrasonic signals at the position of the piston resp. constructively overlap the piston seal.
    According to a further embodiment of the invention, the plurality of transmitting devices are arranged along an axial direction of the side wall of the cylinder housing and / or along a circumference of the side wall of the cylinder housing. The degree of freedom given in this way in the arrangement of the transmitting devices is particularly advantageous if the cylinder has a great length with respect to its cross-section, e.g. at a ratio of 1 to 5 or smaller, respectively. when the cylinder has a small length with respect to its cross-section, e.g. at a ratio of 5 to 1 or larger.
    It is furthermore advantageous if adjacent transmitting devices are arranged at the same distance in the axial direction of the side wall of the cylinder housing and / or along the circumference of the side wall of the cylinder housing. Because with a similar control of the transmitting devices, this is the case of a fixed phase relationship, resp. a fixed phase difference between two adjacent transmitting devices becomes the same, possibly a constructive overlap of the ultrasonic signals emitted from the individual transmitting devices at the position of the piston or the like. of the piston seal. This reduces the complexity of the control of the individual transmitting devices.
    A cylinder according to this further embodiment is characterized in that the plurality of transmitting devices are arranged on an end face of the cylinder housing, which can be advantageous with certain requirements for the cylinder, since no space is used at the side wall.
    Furthermore, it is expedient if the plurality of receiving devices are arranged at the same positions as the plurality of transmitting devices and / or that the plurality of transmitting devices are also arranged as a receiving device to receive the ultrasonic signals reflected from the piston . Because, on the one hand, this simplifies the complexity of the control and, on the other hand, it saves space on the cylinder surfaces. Furthermore, according to the last aspects of the further embodiment, the roles of the transmitting and receiving devices can also be reversed during measurement and possibly to the required transmitting and receiving devices. receiving power can be adjusted.
    According to a further embodiment the cylinder comprises at least one evaluation device which is arranged on the basis of a runtime of the ultrasonic signals between a transmission of the ultrasonic signals by the plurality of transmitting devices and a reception of the ultrasonic signals by determining the position of the piston by the plurality of receiving devices. The expansion medium of the ultrasonic signals is the inside of the side wall of the cylinder housing. A wave expansion speed of the ultrasonic signals is therefore easy to calculate, since the properties of the cylinder wall are known. The sound speed resp. the group speed of the ultrasonic signals in the cylinder wall of the cylinders according to the invention depends solely on the wave mode and the sound frequency in the cylinder wall. The properties of the cylinder wall, however, remain substantially unchanged during the entire operating time of the cylinder and the dependencies of the ultrasonic expansion can thus be calculated in a deterministic and reproducible manner. This dependence can be easily calibrated with a sensor installation and remains constant during the life of the cylinder. The cylinder according to the invention is thus distinguished from cylinders with ultrasonic sensors, wherein the ultrasonic signal spreads in the hydraulic oil. In particular, a high measurement accuracy is possible.
    According to a further embodiment of the method, there is a step of calculating a position of the piston on the basis of a travel time of the ultrasonic signals between transmitting and receiving the ultrasonic signals. The aforementioned advantages also apply to the method in a corresponding manner.
    Brief description of the drawings The following is shown:
    FIG. 1 is a sectional view of a side illustration of a cylinder according to the invention;
    FIG. 2 is a cross-sectional view of a side illustration of a cylinder according to the invention;
    FIG. 3 is a top view of the end face of the cylinder according to the invention;
    FIG. 4 is a side view of the cylinder according to the invention;
    FIG. 5 is a side view of the cylinder according to the invention in an alternative embodiment;
    FIG. 6 is a top view of the end face of the cylinder according to the invention in the alternative embodiment; and
    FIG. 7 is a flow chart for a method according to the invention for determining a position of a piston in a cylinder.
    In all figures, the same resp. functionally similar elements and devices - unless otherwise specified - are provided with the same reference sign.
    Description of the exemplary embodiments
    Figure 1 shows a cylinder 100, in particular a hydraulic cylinder for use in a hydraulic system. The cylinder 100 comprises a cylinder housing 102 with a cylindrical side wall 103, which is arranged axially about an axis of symmetry of the cylinder 100, and of a first outer wall 104 in the axial direction of the cylinder housing 102, which defines the cylinder 100 in the axial direction. Opposite the first outer wall 104, an opening 105 is arranged in a second outer wall 115 of the cylinder housing 102, into which a piston 101 is axially slidably inserted. A position of the piston 101 is determined by a distance x from the first outer wall 104. The cylindrical side wall 103 of the cylinder housing 102 has an inside 103a and an outside 103b lying in a radial direction on the outside. The piston 101 here has a seal 101a, which defines a radial outer range of the piston 101, contacts the outside 103b of the cylinder housing and serves to seal a pressure chamber 116 between the piston 101 and the first outer wall 104 of the cylinder housing 102.
    A plurality of transmitting devices 1061, 1062, 1063 are provided at the cylindrical side wall 103. The transmitting devices 1061, 1062, 1063 each comprise an attachment 1061a, 1062a, 1063a, which is arranged on the outside 103b of the cylindrical side wall 103 of the cylinder housing 102. The extensions 1061a, 1062a, 1063a are preferably made of metal with a first refractive index ni, whereby the first refractive index ni differs from a second refractive index Π2 of the cylinder housing 102.
    However, the invention is not limited thereto. For example, the extensions 1061a, 1062a, 1063a may also be permitted in the cylindrical side wall 103.
    Each of one of the mounts 1061a, 1062a, 1063a is provided with a transmitter 1061b, 1062b, 1063b, which are adapted to transmit an ultrasonic signal 108 through the mounts 1061a, 1062a, 1063a. The ultrasonic signal 108 is typically modulated on an ultrasonic wave. The ultrasonic signal can in particular also be a wave packet.
    The heads 1061a, 1062a, 1063a are wedge-shaped, so that the ultrasonic signal 108 arranged from the transmitter 1061b, 1062b, 1063b is hit at an angle of angle ≤ pi with respect to a plane normal 109 on the cylindrical side wall 103. In the following, this is shown for the sake of clarity only in one of the transmitting devices 1063. At the interfaces 110 between the attachment 106a and the more cylindrical side wall 103, the ultrasonic signal 108 or The ultrasonic wave carrying the ultrasonic signal 108 is broken. The angle of refraction is hereby determined from Snellius' refraction law, that is to say according to the following formula:
    Here, φ2 is the angle of exit of the ultrasonic signals 108 in the cylinder housing 102. With known refractive indices ni and nz of the mounts and of the cylinder housing 102, the incident angle <pi is set such that the exit angle φ2 is essentially 90 °, so that the ultrasonic signal 108 spreads along the inside 103a of the side wall 103 of the cylinder housing 102. The ultrasonic signals 108 of the plurality of transmitting devices 1061, 1062, 1063 thus run parallel to the cylindrical side wall 103. Such ultrasonic signals 108, which are located on the inside 103a of the side wall 103 and 10, respectively. extending within the side wall 103 of the cylinder housing 102 are referred to as Rayleigh or Scholte waves. Since the ultrasonic signals 108 of the plurality of transmitting devices 1061.1062.1063 extend not only along the cylinder axis, but also above the joint side wall 103 of the cylinder housing 102, the ultrasonic signals 108 of the plurality of transmitting devices devices 1061.1062.1063. There are locations within the side wall 103 where the ultrasonic signals 108 are structurally overlapping and there are locations where the ultrasonic signals 108 are destructively overlapping. At locations at which the ultrasonic signals 108 interfere destructively, no or only a slight reflection can be obtained at, for example, the piston 101, resp. of the piston seal 101a. Only at locations where the ultrasonic signals 108 interfere constructively, can the ultrasonic signal 108 on the piston 101 resp. from the piston seal 101a.
    The reflected ultrasonic signal 108 then propagates in the opposite direction and is received from at least one of several receiving devices 1071. The receiving devices 1071 are preferably arranged similarly to the transmitting devices 1061, 1062, 1063, i.e. the receiving devices 1071 also each have an arrangement 1071a and a receiver 1071b arranged thereon.
    It is furthermore possible that the transmitting devices 1061, 1062, 1063 and the receiving devices 1071 are identical, that is, the device can both transmit and receive ultrasonic signals 108, or that it can be so on or off of the cylindrical side wall 103, which is a distance xi resp. X 2 from the first outer wall 104 to the transmitting devices 1061, 1062, 1063 and until the receiving devices 1071 are of equal size. This is the case, for example, when one of the transmitting devices 1061, 1062, 1063 and the receiving devices 1071 are arranged side by side on the same circumference of the cylinder 100. In the following, it is assumed, for the sake of clarity, that a plurality of transmitting devices 1061, 1062, 1063 and a receiving device 1071 are arranged on the cylinder 100 along the cylinder axis. The transmitting device 1061 and the receiving device 1071 are shown as one device.
    The receiving device 1071 and the transmitting devices 1061, 1062, 1063 are connected to a control device 111. The control device 111 controls the sending devices 1061.1062.1063. The control device 111 comprises an evaluation device 112 which is arranged on the basis of a runtime 5t of the ultrasonic signals 108 between a transmission of the ultrasonic signals 108 by the transmitting devices 106 and a receiving of the reflected ultrasonic signals 108 by the receiving device 1071 to determine the position of the piston 101, i.e. the distance x between first outer wall 104 and piston 101. The evaluation device 112 thereby measures a first time point t 1 of the emitter of the ultrasonic signals 108 by the transmitting devices 1061, 1062, 1063 and a second time point t 2 of the receiver of the reflected ultrasonic signals 108 by the receiving device 1071. The travel time 5t of the ultrasonic signals 108 is therefore given by 5t = t2 - t1. When determining a position of the piston 101, the evaluation device 112 considers a known distance X2 from the transmitting device 1061 and a known distance xi from the receiving devices 1071 from the first outer wall 104 of the cylinder housing 102. A common distance 5y from the ultrasonic signals 108 between sending and receiving is calculated according to the following formula:
    Where v is the expansion rate of the ultrasonic signals 108 in the material of the cylindrical side wall 103. The joint distance 5y of the ultrasonic signals 108 is equal to 2yi + x2 - xi, where yi is the distance of the transmitting devices 106 of the piston 101. The thickness of the cylindrical side wall 103 is hereby neglected, since it is small with respect to the distance y 1 of the transmitting devices 106 of the piston 101 as well as a distance x 2 - x 1 of transmitting devices 106 and receiving devices 107. Since the transmitting device 1061 and receiving device 1071 of the side wall 103 are equidistant, X 2 is -xi.
    Hereby the distance x of the piston of the first outer wall 104 becomes:
    The evaluation device 112 is adapted to measure the distance x of the piston 101 from the first outer wall 104 on the basis of this formula.
    For example, the expansion speed of the ultrasonic signals 108 in the material of the cylindrical side wall 103 is 1500 m / s and the distance x2 of the transmitting devices 106 of the first outer wall 104 of the cylinder housing 102 is 10 cm and the distance xi of the receiving devices 107 of the first outer wall 104 of the cylinder housing 102 is also equal to 10 cm, and the travel time 5t of the ultrasonic signals 108 is equal to 1 ms, so one obtains for the distance x of the piston 101 from the first outer wall 104:
    The evaluation device 112 may further be arranged to consider a reflection of the ultrasonic signals 108 at the second outer wall 115, this reflection resulting from a portion of the ultrasonic signals not already at the front point 114 of the seal 101a of the piston 101 was reflected. Furthermore, the evaluation device 112 may be arranged, the distances from the transmitter 1061b, 1062b, 1063b, respectively. of the receipt 1071b of the cylindrical side wall 103.
    Furthermore, the evaluation device 112 is arranged to consider a sound-energy radiation of the ultrasonic signals 108 in a hydraulic oil in the interior of the cylinder. In particular, an intensity of the ultrasonic signals 108 is selected such that a sufficient signal-to-noise ratio is guaranteed in signal determination.
    The invention is not limited thereto. Thus, the evaluation device 112 can also be identical to the sending device 106.
    Figure 2 shows a cross-section from Figure 1, in which the side wall 103 of the cylinder housing 102 is shown enlarged. Each of the transmitting devices 1061, 1062, 1063 emits ultrasonic signals 1081, 1082, 1083 which extend along the inner surface of the side wall 103. The wavelength of the ultrasonic signals 1081, 1082, 1083 can be selected such that an amplitude of an ultrasonic signal 1080, which is determined from the overlap of the ultrasonic signals 1081.1082.1083, at the front point 114 of the seal 101a of the piston 101 is as large as possible.
    Preferably, it is possible that the control device 111 (not shown) controls the transmitting devices 1061.1062.1063 with a phase shift such that the amplitude of the ultrasonic signal 1080, which is determined by the overlap of the ultrasonic signals 1081,1082,1083, is as large as possible at the front point 114 of the seal 101a of the piston 101.
    Figure 3 shows a cylinder 200 according to a second embodiment of the present invention. Sending devices 1061.2061, 3061.4061.5061 are identical to receiving devices 1071.2071.3071, 4071.5071 and are arranged along the circumference of the cylinder housing 102. Each of the transmitting devices 1061,2061,3061,4061,5061 is thereby arranged to transmit coherent ultrasonic signals 108. The locations along the side wall 103 of the cylinder housing 102, at which the ultrasonic signals 108 interfere constructively and destructively, vary depending on both the number of transmitting devices 1061, 2061, 3061, 4061.5061 and of the ultrasonic signals 108 positions of the transmitting devices 1061, 2061, 3061, 4061, 5061. Thus, depending on the expected piston position, the empirical data can be estimated, some of the transmitting devices 1061.2061, 3061, 4061, 5061 can be switched off or down. Accordingly, it may be provided that not all of the receiving devices 1071.2071, 3071, 4071, 5071 are deployed, but also depending on the expected piston position and hence dependent on the expected position, the ultrasonic signal reflected at the piston seal 101a 108 can be received by one or a few of the receiving devices 1071.2071.3071.4071.5071.
    In an alternative embodiment, it is possible that not all transmitting devices 1061,2061, 3061, 4061.5061 or receiving devices 1071.2071, 3071, 4071, 5071 are used or measured per measuring cycle. be controlled. It may be provided that, during intermediate steps of the received ultrasonic signals 108 of a predetermined sound value, one or more of the receiving devices 1071, 2071, 3071, 4071, 5071 further downsize the receiving devices and / or transmitting devices to the determinable threshold has been exceeded.
    Figure 4 shows a side view of a further embodiment of the cylinder according to the invention 200 from Figure 2. Sending devices 1061, 1062, 1063 and the receiving devices 1071, 1072, 1073 are shown here, which are each at the same location on the cylinder housing 202. Furthermore, the transmitting devices 1061, 1062, 1063 and the receiving devices 1071, 1072, 1073 are mounted on the cylinder housing 202 along the cylinder axis with a predetermined distance from each other. Furthermore, transmitting devices 2061.3061.4061.5061 and receiving devices 2071.3071.4071, 5071 are mounted on the cylinder housing 202, which is arranged along a circumference of the cylinder 200, on which also the transmitting device 1061 and the receiving device 1071 are applied. Furthermore, transmitting devices 2062, 3062, 4062, 5062 and receiving devices 2072, 3072, 4072, 5072 are mounted on the cylinder housing 202, which is arranged along a circumference of the cylinder 200, on which also the transmitting device 1062 and the receiving device 1072 are applied. Furthermore, transmitting devices 2063, 3063, 4063, 5063 and receiving devices 2073, 3073, 4073, 5073 are mounted on the cylinder housing 202, which is arranged along a circumference of the cylinder 200, on which also the transmitting device 1063 and the receiving device 1073 are applied. This array structure, which is characterized by this, can be widened or reduced along the cylinder axis. Furthermore, it is possible that the number of transmitting and receiving devices along a circumference of the cylinder housing 202 is increased or decreased. The control device 111 (not shown), which is connected to all transmitting and receiving devices, can now, analogous to the exemplary embodiment described in Fig. 3, a certain number of the transmitting devices 1061 - 5061, 1062 - 5062, 1063 - 5063 and / or operate the receiving devices 1071 - 5071.1072 - 5072.1073 - 5073 such that a detectable phase relationship lies between the ultrasonic signals 108 input from each transmitting device 1061 - 5061.1062 - 5062, 1063 - 5063 . Thereby it can be ensured that at the front point 214 of the piston seal 201a the interference signal of all transmitted ultrasonic signals is above a predetermined threshold value and that the direction of the reflected ultrasonic signals can be determined. As a result, the number with controlled or resp. operated receiving devices 1071 - 5071.1072 - 5072.1073 - 5073 can be reduced.
    Figure 5 shows a side view and Figure 6 shows a top view of a cylinder according to the invention 300 in an alternative embodiment. The transmitting devices 1061 - 8061 and the receiving devices 1071 - 8071 are arranged along the edge of a first outer wall 304 of the cylinder 300. It is again expedient if the transmitting devices 1061 - 8061 and the receiving devices 1071 - 8071 are each arranged in the same position.
    Fig. 7 shows a flow diagram for a method 700 according to the invention for determining a position of a piston 101,201 in a cylinder 100, 200, 300. The method 700 comprises a first step 701 of controlling a plurality of transmitting devices 1061 - 5061.1062 - 5062, 1063 - 5063 for transmitting resp. inputting ultrasonic signals 108 into a side wall 103, 203 of a cylinder housing 102, 202. Here, the transmitting devices 1061 - 5061, 1062 - 5062, 1063 - 5063 are operated by a control device 111 such that the ultrasonic signals 108 at a front point 114, 214 of a piston seal 101a, 201a of a piston 101,201 structurally overlap and thus have a maximum at sound intensity that is above a predetermined threshold value. The control can here follow such that the ultrasonic signals 108 emitted from the transmitting devices 1061 - 5061, 1062 - 5062.1063 - 5063 have a measurable phase difference.
    The method 700 further comprises a second step 702 of driving a plurality of receiving devices 1071 -5071.1072-5072.1073-5073 for receiving the reflected at the front point 114, 214 of the piston seal 101a, 201a of the piston 101,201 ultrasonic signals 108.
    Further, the method 700 includes a third step 703 of calculating a position of the piston 101,201, i.e., a distance x of the piston 101,201 from a first outer wall 104, 304 of the cylinder 100, 200, 300. The calculation of the position is herein calculated on the basis of a travel time ot of the ultrasonic signals 108 between the transmission and the reception of the ultrasonic signals 108.
    权利要求:
    Claims (13)
    [1]
    A cylinder (100, 200, 300), in particular for use in a hydraulic system, with a cylinder housing (102, 202) with a cylindrical side wall (103, 203); with a piston (101) disposed axially slidably in the cylinder housing (102, 202); with a plurality of transmitting devices (1061 - 5061, 1062 - 5062, 1063 - 5063) which are arranged on the cylinder housing (102, 202) and are arranged to receive ultrasonic signals (108) in the side wall (103, 203) of the enter cylinder housing (102, 202); characterized by a control device (111) with which the plurality of transmitting devices (1061 - 5061, 1062 - 5062, 1063 - 5063) are controllable such that the side wall (103, 203) of the cylinder housing (102, 202) input ultrasonic signals (108) overlap such that a signal at a position of the piston (101,201) is above a predetermined threshold value.
    [2]
    Cylinder (100, 200, 300) according to claim 1, characterized in that the cylinder (100, 200, 300) has at least one receiving device (1071 -5071, 1072 - 5072.1073 - 5073) which is connected to the cylinder housing (102, 202) and arranged to receive the ultrasonic signals (108) reflected from the piston (101,201).
    [3]
    Cylinder (100, 200, 300) according to claim 1 or 2, characterized in that the plurality of transmitting devices (1061 - 5061, 1062 - 5062, 1063 - 5063) can be controlled by means of the control device (111) such that between the ultrasonic signals (108) introduced from the plurality of transmitting devices (1061 - 5061, 1062 - 5062, 1063-5063) into the side wall (103, 203) of the cylinder housing (102, 202).
    [4]
    Cylinder (100, 200, 300) according to one of the preceding claims, characterized in that the cylinder (100, 200, 300) has a plurality of receiving devices (1071 - 5071, 1072 - 5072, 1073 - 5073), the control device (111) selects from the plurality of receiving devices (1071 -5071, 1072-5072, 1073-5073) at least one receiving device (1071 -5071, 1072-5072.1073-5073) such that a received signal of the at least one selected receiving device (1071 -5071, 1072-5072.1073-5073) is above a predetermined threshold value.
    [5]
    Cylinder (100, 200, 300) according to one of the preceding claims, characterized in that the plurality of receiving devices (1071 - 5071, 1072 - 5072, 1073 - 5073) can be controlled by the control device (111) such that the ultrasonic signals (108) reflected from the piston (101,201) can be received from a predetermined direction.
    [6]
    Cylinder (100, 200, 300) according to one of the preceding claims, characterized in that the plurality of transmitting devices (1061 - 5061, 1062 - 5062, 1063 - 5063) are arranged on the cylinder housing (102, 202) that the ultrasonic signals (108) introduced into the side wall (103, 203) of the cylinder housing (102, 202) overlap such that the signal at the position of the piston (101,201) is above a predetermined threshold value.
    [7]
    Cylinder (100, 200, 300) according to claim 6, characterized in that the plurality of transmitting devices (1061 -5061, 1062-5062, 1063-5063) along an axial direction of the side wall (103, 203) of the cylinder housing (102, 202) and / or along a circumference of the side wall (103, 203) of the cylinder housing (102, 202).
    [8]
    Cylinder (100, 200, 300) according to claim 6 or 7, characterized in that neighboring transmitting devices (1061 - 5061, 1062 - 5062, 1063 - 5063) in the axial direction of the side wall (103, 203) of the cylinder housing (102, 202) and / or along the circumference of the side wall (103, 203) of the cylinder housing (102, 202) are arranged with equal spacing.
    [9]
    Cylinder (100, 200, 300) according to claim 6, characterized in that the plurality of transmitting devices (1061 - 5061, 1062 - 5062, 1063 - 5063) on an end face (104, 304) of the cylinder housing (102, 202).
    [10]
    Cylinder (100, 200, 300) according to one of the preceding claims, characterized in that the plurality of receiving devices (1071 -5071.1072 - 5072.1073 - 5073) are in the same positions as the plurality of transmitting devices (1061 - 5061, 1062 - 5062, 1063 - 5063) and / or that the plurality of transmitting devices (1061 - 5061, 1062 - 5062, 1063 - 5063) are also arranged as a receiving device (1071 - 5071, 1072 - 5072, 1073 - 5073) adapted to receive the ultrasonic signals (108) reflected from the piston (101,201).
    [11]
    Cylinder (100, 200, 300) according to one of the preceding claims, characterized by at least one evaluation device, which is arranged to transmit the ultrasonic signals on the basis of a travel time of the ultrasonic signals (108) (108) by the plurality of transmitting devices (1061 - 5061.1062 - 5062.1063 - 5063) and receiving of the ultrasonic signals (108) by the plurality of receiving devices (1071 -5071, 1072-5072, 1073- 5073) to determine a position of the piston (101, 201).
    [12]
    Method (700) for determining a position of a piston (101, 201) in a cylinder (100, 200, 300), in particular in a cylinder (100, 200, 300) according to one of the preceding claims , comprising the steps of: controlling (701) a plurality of transmitting devices (1061 - 5061, 1062 - 5062, 1063 - 5063) for inputting ultrasonic signals (108) into a side wall (103, 203) of a cylinder housing (102 202) of the cylinder (100, 200, 300), the input ultrasonic signals (108) overlapping such that a signal at the position of the piston (101,201) is above a predetermined threshold value; and controlling (702) a plurality of receiving devices (1071 - 5071, 1072 - 5072, 1073 - 5073) for receiving the ultrasonic reflector (101, 201) disposed from the axially slidable in the cylinder housing (102, 202) signals (108).
    [13]
    The method of claim 12 including the step of calculating a position of the piston (101,201) based on a travel time of the ultrasonic signals (108) between transmitting and receiving the ultrasonic signals (108).
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    同族专利:
    公开号 | 公开日
    SG10201610650TA|2017-09-28|
    DE102016202931A1|2017-08-31|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102016202931.2A|DE102016202931A1|2016-02-25|2016-02-25|A cylinder and method for determining a position of a piston in a cylinder|
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