• 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 present invention relates to a heating, ventilation and / or air conditioning device (1) for a motor vehicle (2), according to which said heating, ventilation and / or air conditioning device (1) comprises: - a cabin air filter ( 10); - at least one air pressure sensor (11) configured to: - measure a primary air pressure (Pin) at the inlet of said cabin air filter (10); - measuring a secondary air pressure (Pout) at the outlet of said cabin air filter (10); - transmitting said measured primary air pressure (Pin) and said measured secondary air pressure (Pout) to a clogging detection device (3) so that said clogging detection device (3) can calculate a loss of load (Pa) from said primary (Pin) and secondary (Pout) air pressures and compare it with at least one reference pressure drop value (Paref) to a determined air flow (qref).
    公开号:FR3081781A1
    申请号:FR1854755
    申请日:2018-06-01
    公开日:2019-12-06
    发明作者:Alexis De-Laplane；Morgane Lucas；Younick Portal；Ronan Quistrebert
    申请人:Valeo Systemes Thermiques SAS；
    IPC主号:
    专利说明:

    TECHNICAL FIELD OF THE INVENTION
    The present invention relates to a heating, ventilation and / or air conditioning device for a motor vehicle. The invention also relates to a device for detecting clogging of a cabin air filter of a heating, ventilation and / or air conditioning device for a motor vehicle. Finally, the invention also relates to a method for detecting clogging of a cabin air filter of a heating, ventilation and / or air conditioning device for a motor vehicle.
    It finds a particular, but not limiting, application in motor vehicles.
    TECHNOLOGICAL BACKGROUND OF THE INVENTION
    A heating, ventilation and / or air conditioning device known to a person skilled in the art comprises a cabin air filter for ensuring the quality of the cabin air in said motor vehicle.
    A cabin air filter has different layers of filter materials known as filter media. A cabin air filter filters out particles and gases. The end of life of a cabin air filter is defined by the clogging (fouling) of the filter media. This clogging corresponds to the moment when the different layers of filtering materials are saturated with particles and / or gases and no longer allow the passage of sufficient air flow in the passenger compartment.
    The life of a cabin air filter is arbitrarily defined on the basis of a number of kilometers traveled by the motor vehicle, for example 15,000 km or once a year and therefore without technical data on the actual use of the cabin air filter by the end user. This arbitrary life does not take into account the conditions of use of the cabin air filter. Depending on the conditions of use (for example use in a more or less polluted area), the cabin air filter may clog up more or less quickly.
    A disadvantage of this prior art is that the user, such as the owner of the motor vehicle, does not know at what stage of clogging his cabin air filter is located, which can lead him to replace his filter. cabin air more often than necessary or use a cabin air filter that no longer performs its filtering functions.
    In this context, the present invention aims to propose a heating, ventilation and / or air conditioning device which makes it possible to resolve the drawback mentioned above.
    GENERAL DESCRIPTION OF THE INVENTION
    To this end, the invention provides a heating, ventilation and / or air conditioning device for a motor vehicle, according to which said heating, ventilation and / or air conditioning device comprises:
    - a cabin air filter;
    - at least one air pressure sensor configured for:
    - measuring a primary air pressure at the inlet of said cabin air filter, in other words, said at least one air pressure sensor is configured to measure a primary air pressure upstream with respect to the flow of the air flow from said cabin air filter;
    - measuring a secondary air pressure at the outlet of said cabin air filter, in other words, said at least one air pressure sensor is configured to measure a primary air pressure downstream with respect to the flow of the air flow from said cabin air filter;
    transmitting said measured primary air pressure and said measured secondary air pressure to a clogging detection device so that said clogging detection device can calculate a pressure drop from said primary and secondary air pressures and compare it with at least one reference pressure drop value at a determined air flow.
    Thus, by measuring the pressure drop, namely the reduction in an air flow due to the different layers of the filter media of the cabin air filter, it can be determined whether the air filter is clogged or not and is it has reached its maximum clogging capacity by comparing the pressure drop with a reference pressure drop value which represents a clogging threshold value. The clogging capacity is indeed a function of the pressure drop. In fact, the more particles accumulated by the filtering media of the cabin air filter, the more the pressure drop increases.
    According to non-limiting embodiments, said heating, ventilation and / or air conditioning device for a motor vehicle may further include one or more additional characteristics among the following:
    According to a nonlimiting embodiment, said reference pressure drop value is characteristic of an end of life of said cabin air filter.
    According to a nonlimiting embodiment, said heating, ventilation and / or air conditioning device comprises a single air pressure sensor. This reduces costs compared to using two air pressure sensors.
    According to a nonlimiting embodiment, said heating, ventilation and / or air conditioning device comprises two air pressure sensors configured to measure respectively said primary air pressure and said secondary air pressure.
    According to a nonlimiting embodiment, the measurement of said primary air pressure and the measurement of said secondary air pressure are carried out at the start of said heating, ventilation and / or air conditioning device. In particular, this is done after starting the fan. This allows for a stable regime for the measurements.
    According to a nonlimiting embodiment, there are a plurality of reference pressure drop values and the number of reference pressure drop values is equal to the number of possible air flows in the passenger compartment of said motor vehicle.
    A clogging detection device is also proposed for a cabin air filter of a heating, ventilation and / or air conditioning device for a motor vehicle as described above, according to which said clogging detection device is configured. for :
    - receive from at least one air pressure sensor a measured primary air pressure and a measured secondary air pressure;
    - calculate a pressure drop from said primary and secondary air pressures;
    - compare said pressure drop with at least one reference pressure drop value at a determined air flow.
    According to a nonlimiting embodiment, said clogging detection device is further configured to generate an alarm if said pressure drop is greater than or equal to said at least one reference pressure drop value.
    A method of detecting clogging of a cabin air filter of a heating, ventilation and / or air conditioning device for a motor vehicle as described above is also proposed, according to which said method of detecting clogging comprises the following steps:
    - measurement by at least one air pressure sensor of a primary air pressure at the inlet of said cabin air filter;
    - Measurement by said at least one air pressure sensor of a secondary air pressure at the outlet of said cabin air filter;
    - calculation by a clogging detection device of a pressure drop from said primary and secondary air pressures;
    - Comparison by said clogging detection device of said pressure drop with at least one reference pressure drop value at a determined air flow.
    According to a nonlimiting embodiment, if said pressure drop is greater than or equal to said at least one reference pressure drop value, said clogging detection method further comprises a step of generating a change of said alarm. cabin air filter.
    According to a nonlimiting embodiment, said clogging detection method further comprises the transmission by said at least one air pressure sensor of said primary and secondary air pressure to said clogging detection device of said air filter. cockpit.
    BRIEF DESCRIPTION OF THE FIGURES
    The invention and its various applications will be better understood on reading the description which follows and on examining the figures which accompany it:
    - Figure 1 shows a block diagram of a heating, ventilation and / or air conditioning device for a motor vehicle comprising a cabin air filter and at least one air pressure sensor, and configured to cooperate with a device for clogging detection, according to a nonlimiting embodiment of the invention;
    - Figure 2 shows a block diagram of the operation of said heating, ventilation and / or air conditioning device of Figure 1, according to a first non-limiting embodiment;
    - Figure 3 shows a block diagram of the operation of said heating, ventilation and / or air conditioning device of Figure 1, according to a second non-limiting embodiment of the invention;
    - Figure 4 schematically shows a clogging curve used to determine the end of life of the cabin air filter of the heating, ventilation and / or air conditioning device of Figures 1 to 3;
    - Figure 5 shows schematically a clogging detection method of the cabin air filter of the heating, ventilation and / or air conditioning device for motor vehicle of Figures 1 to 4, according to a non-limiting embodiment of the invention.
    DESCRIPTION OF EMBODIMENTS OF THE INVENTION
    Identical elements, by structure or by function, appearing in different figures keep, unless otherwise specified, the same references.
    The heating, ventilation and / or air conditioning device 1 for a motor vehicle 2 and the clogging detection device 3, according to the invention are described with reference to FIGS. 1 to 4. The heating, ventilation and / or air conditioning device 1 is called HVAC "Heating Ventilation Air Conditioning"), otherwise called HVAC device. By motor vehicle is meant any type of motor vehicle.
    For the remainder of the description, the pressure drop Pa is understood to mean the reduction in the air flow due to the mechanical resistance to air of the cabin air filter 10.
    • .HVAC device
    As illustrated in Figure 1, the HVAC device includes:
    - a cabin air filter 10;
    - at least one air pressure sensor 11.
    As shown in Figure 2, the HVAC device further includes an air duct 12, which is an air intake duct.
    Said HVAC device is configured to receive an air flow F as input, and said cabin air filter 10 is positioned in said air duct 12 so as to process said air flow F at the inlet of said device HVAC.
    The HVAC device further comprises a housing (not illustrated) configured to receive said cabin air filter 10.
    The HVAC device further comprises a fan (not illustrated) configured to bring the air flow F with a certain air flow q into said HVAC device. The fan can be controlled by the user of the motor vehicle 2 so as to obtain a determined air flow q re f. The determined air flow q re f is controlled by an electronic device or manually. In a nonlimiting example, there are up to seven determined airflows possible.
    The HVAC device is configured to cooperate with the clogging detection device 3 described later in the description.
    The elements of the HVAC device are described in detail below.
    o Air duct. 12
    The air duct 12 is configured to direct the air flow F towards the interior of the passenger compartment 21 of the motor vehicle 2 in order to allow a renewal of the air of said passenger compartment 21. In one embodiment not limiting, the air flow F comes from outside the vehicle 2. In another nonlimiting embodiment, the air flow F comes from inside the passenger compartment 21 of the vehicle automobile 2 in the context of air recycling.
    The air circulating in said air duct 12 includes particles such as dust, pollen, residual fine particles from the combustion of internal combustion engines, the chemical industry, atmospheric pollution, etc.
    o Air filter 1.0
    Said cabin air filter 10 is configured to filter the air circulating in the air duct 12.
    For this purpose, it comprises a filtering medium 100 illustrated diagrammatically in FIG. 1 configured to retain upstream the particles present in the air flow F. The more said particles accumulate in the filtering medium 10, the more the air flow F will have a hard time crossing it.
    The filter medium 100 acts as a brake on the passage of air in the duct
    12. This is why the air pressure before and after said cabin air filter 10 will not be the same. Also, the more particles the cabin air filter 10 accumulates, the more it will block the passage of air and the greater the difference in air pressure before and after the cabin air filter 10.
    The cabin air filter 10 is placed in a housing (not shown) of the HVAC device configured to receive it. Said housing is connected to air duct 12.
    o Pressure sensor. 1.1.
    Said at least air pressure sensor 11 is configured for:
    - measure a primary air pressure Pin at the inlet of said cabin air filter 10 (function illustrated in Figure 1 MEAS (Pin));
    - measure a secondary air pressure Pout at the outlet of said cabin air filter 10 (function illustrated in FIG. 1 MEAS (Pout)).
    In a nonlimiting example, the two measurements are made every 1000 kilometers after the start of the fan of the HVAC device, when the fan has reached a constant speed.
    In a nonlimiting embodiment, the measurements of the primary air pressures Pin and secondary Pout are made at the same time.
    Said at least one air pressure sensor 11 comprises one or two pressure probes.
    In a non-limiting embodiment, said at least air pressure sensor 11 is fixed to the air duct 12. At the location of this fixing, an opening is made in the air duct 12 so that its ( its) air pressure probe (s) are in contact with the air flow F.
    In a first nonlimiting embodiment, the pressure probe of said at least one air pressure sensor 11 is moved away from the edge of the air duct 12 in order to measure a dynamic pressure. In a nonlimiting exemplary embodiment, the pressure probe is located 2 cm from the edge of the air duct 12 to measure the dynamic pressure. The air pressure sensor 11 then measures the pressure that the moving air exerts on its pressure probe.
    In a second nonlimiting embodiment, the pressure probe of said at least one air pressure sensor 11 is positioned on the inner surface of the edge of the air duct 12 to measure the static air pressure. The air pressure sensor 11 then measures the pressure exerted on the edges of the duct 12 via its pressure probe.
    In a first nonlimiting embodiment illustrated in FIG. 2, the HVAC device comprises a single air pressure sensor 11.
    In this mode, the single sensor 11 comprises two probes 110 and 111 which respectively measure the primary air pressure Pin and the secondary air pressure Pout. Thus, a probe 110 is arranged upstream of the cabin air filter 10 and the other probe 111 is arranged downstream.
    In a nonlimiting embodiment, a pressure probe 110 is rigidly fixed to the air pressure sensor 11, and the other pressure probe 111 is separated from said air pressure sensor 11. A cable connects it to the air pressure sensor 11 to transmit a measurement of the secondary air pressure Pout to it.
    In a second nonlimiting embodiment illustrated in FIG. 3, the HVAC device comprises two pressure sensors 11a, 11b each with a probe 110, 111. Thus, a sensor 11 a with its probe 110 is arranged upstream of the filter at passenger compartment air 10 and the other sensor 11b with its probe 111 is arranged downstream.
    In a nonlimiting embodiment, the pressure probes 110, 111 are rigidly fixed respectively to the air pressure sensors 11a, 11b.
    After having carried out the measurements of the primary air pressures Pin and secondary Pout, said at least one air pressure sensor 11 communicates them to the clogging detection device 3.
    Thus, said at least one air pressure sensor 11 is configured to transmit said primary air pressure measured Pin and said secondary air pressure Pout to the clogging detection device 3 of said motor vehicle 2 (functions illustrated in the figure 1 TX (Pin) and TX (Pout)) so that the latter calculates a pressure drop Pa from said primary air pressure Pin and secondary Pout and compares it with at least one reference pressure drop value Pa re f at a determined air flow qref In a non-limiting embodiment, the transmission is made for example by a communication protocol in the form of a Bluetooth connection.
    The clogging detection device 3 is described below.
    • Clogging detection device 3
    In a nonlimiting embodiment, said clogging detection device 3 is an electronic unit of said motor vehicle 2. In a nonlimiting embodiment, said electronic unit is the central electronic unit, otherwise called ECU, of motor vehicle 2 This central electronic unit is not part of the HVAC device.
    The clogging capacity of the cabin air filter 10 is a function of the pressure drop Pa. Indeed, the more particles accumulated by the filter medium 100 of the cabin air filter 10, the more the pressure drop Pa increases. It will be recalled that the clogging capacity is the quantity in grams of particles that the filtering medium 100 can stop up to a certain acceptable pressure drop value Pa (a too high pressure drop Pa results in an insufficient air flow F in the passenger compartment 21 of the motor vehicle 2). The pressure drop Pa is therefore a significant parameter for determining the life of the cabin air filter 100.
    Thus, the clogging detection device 3 is configured to:
    - receive from at least one air pressure sensor 11 a primary air pressure measured Pin and a secondary air pressure measured Pout (functions illustrated in FIG. 1 RX (Pin), Rx (Pout));
    - calculate a pressure drop Pa from said primary air pressure Pin and secondary air Pout (function illustrated in Figure 1 MEAS (Pa, Pin, Pout)).
    The clogging detection device 3 calculates the pressure drop Pa undergone by the air flow F when the cabin air filter 11 passes by making the difference between the primary air pressure Pin and the secondary air pressure Pout. In a nonlimiting embodiment, the pressure drop Pa is calculated approximately every 1000 kilometers traveled by the motor vehicle 2 and when the speed of the air flow F is constant, namely after the fan has started.
    Said clogging detection device 3 is further configured to:
    - comparing said pressure drop Pa with at least one reference pressure drop value Pa re f to a determined air flow q re f (function illustrated in FIG. 1 COMP (Pa, Pa re f (qref))) ·
    Said clogging detection device 3 is provided in memory with a pressure drop value library comprising at least one reference pressure drop value Pa re f corresponding to a determined air flow q re f, namely at a given ventilation speed. More particularly, the clogging detection device 3 includes in memory at least one clogging curve Cb, each clogging curve Cb being defined by a plurality of operating points, for example 7 operating points.
    The clogging curve Cb illustrated in FIG. 4 illustrates a characteristic point E which corresponds to the limiting clogging capacity of the cabin air filter 10 at a determined air flow q re f- This characteristic point E comprises on the abscissa a quantity Qp in grams of particles limit and on the ordinate a reference pressure drop Pa re f (in Pascal) limit which represents the value of reference pressure drop Pa re f.
    The reference pressure drop value Pa re f is the pressure drop threshold from which it must be considered that the cabin filter 10 (in particular its filter medium 100) is obstructed, in other words clogged. Thus, the reference pressure drop value Pa re f is characteristic of the end of life of said cabin air filter 10.
    This clogging curve Cb thus serves as an abacus for the pressure drop Pa calculated. In the nonlimiting example illustrated in FIG. 4, there is a reference pressure drop value Pa re f of 250 Pascal for a given air flow q re f of 400m 3 / h.
    In a nonlimiting embodiment, there are a plurality of reference pressure drop values Pa re f and the number of reference pressure drop values Pa re f is equal to the number of air flows q ref possible in the passenger compartment 21 of said motor vehicle 2.
    In a nonlimiting example, the clogging detection device 3 has in memory seven reference pressure drop values Pa re f each corresponding to an air flow q ref possible in the passenger compartment 21, namely at a given ventilation speed value. More particularly, the clogging detection device 3 comprises in memory seven clogging curves Cb.
    It will be noted that the clogging curves Cb are a function of the cabin air filter 10. Also, they may be different from one cabin air filter 10 to another.
    The comparison between the pressure drop Pa and the reference pressure drop value Pa re f consists in seeing whether said pressure drop Pa is greater than or equal to the reference pressure drop value Pa re f.
    If so, this means that the pressure drop Pa caused by the cabin filter 10 is too great and as a result that its filter medium 100 is obstructed.
    Thus, if said pressure drop Pa is greater than or equal to at least one reference pressure drop value Pa re f, in a nonlimiting embodiment, the clogging detection device 3 generates an alarm I of change of said filter at passenger compartment air 10 (function illustrated in FIG. 1 ACTIV (I)). The generation of the alarm I is expressed by textual or graphical or light information displayed on the HMI man-machine interface of the motor vehicle 2 intended for the user of the motor vehicle 2. In non-limiting examples, the information indicates to the user that it is necessary to change his cabin air filter 10 or that the latter is clogged. One can indicate for example the percentage of clogging. The user thus knows that he must change his cabin air filter
    10.
    Thus, the clogging (fouling) of the cabin air filter 10 of the HVAC device is detected according to the clogging detection method PR of a cabin air filter 10 of the HVAC device illustrated in FIG. 5, according to a mode non-limiting implementation. In this nonlimiting embodiment, the clogging detection device 3 is independent of the HVAC device.
    The clogging detection method PR includes:
    - the measurement by at least one air pressure sensor 11 of a primary air pressure Pin at the inlet of said cabin air filter 1 (step 1 illustrated)
    J
    - The measurement by said at least one air pressure sensor 11 of a secondary air pressure Pout at the outlet of said cabin air filter 1 (step 2 illustrated);
    - the calculation by said clogging detection device 3 of a pressure drop Pa from said primary air pressures Pin and secondary Pout (step 5 illustrated);
    - Comparing said pressure drop Pa with at least one reference pressure drop value Pa re f at a determined air flow q re f (step 6 illustrated).
    In a nonlimiting embodiment, said clogging detection method PR further comprises the transmission by said at least one air pressure sensor 11 of said primary air pressure Pin and secondary Pout to a clogging detection device 3 said cabin air filter 10 which receives them (steps 3/3 'and 4/4' illustrated).
    In a nonlimiting embodiment, if said pressure drop Pa is greater than or equal to said at least one reference pressure drop value Pa re f, said clogging detection method PR further comprises the generation of an alarm I (step 7 illustrated).
    Of course, the description of the invention is not limited to the embodiments described above.
    Thus, the invention applies to any type of cabin air filter 10 whether it be particulate, activated carbon or combined.
    Thus, in another nonlimiting embodiment, the clogging detection device 3 is an electronic unit other than the central electronic unit, which is part of the HVAC device.
    Thus, in another nonlimiting embodiment, the clogging detection device 3 is part of said at least one air pressure sensor 11. In this case, there is no transmission of the pressure measurement primary air Pin and secondary air Pout.
    Thus, the invention described has the following advantages in particular:
    - it avoids increasing the power of the fan of said HVAC device to ensure a constant air flow which makes it possible to increase the air flow in the cabin air filter 1 if the latter is clogged. It therefore avoids overconsumption of energy as well as premature wear of the fan of the HVAC device and it makes it possible to reduce noise pollution;
    - The use of at least one air pressure sensor 11 makes it possible to reduce costs compared to the use of a flow meter;
    - It allows the user to know precisely when to change the cabin air filter 10. Thus, he no longer changes his cabin air filter 10 after it is already too clogged. Thus, it no longer changes its cabin air filter 10 before it is clogged, while it can still perform its filtering functions.
    - It allows always to have well filtered air in the passenger compartment 21 of the motor vehicle 2 and thus avoids having polluted air.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1. A heating, ventilation and / or air conditioning device (1) for a motor vehicle (2), according to which said heating, ventilation and / or air conditioning device (1) comprises:
    - a cabin air filter (10);
    - at least one air pressure sensor (11) configured for:
    - measure a primary air pressure (Pin) at the inlet of said cabin air filter (10);
    - measure a secondary air pressure (Pout) at the outlet of said cabin air filter (10);
    - transmitting said measured primary air pressure (Pin) and said measured secondary air pressure (Pout) to a clogging detection device (3) so that said clogging detection device (3) can calculate a loss of load (Pa) from said primary (Pin) and secondary (Pout) air pressures and compare it with at least one reference pressure drop value (Pa re f) to a determined air flow (q re f ).
    [2" id="c-fr-0002]
    2. A heating, ventilation and / or air conditioning device (1) according to claim 1, according to which said reference pressure drop value (Pa re f) is characteristic of an end of life of said cabin air filter ( 10).
    [3" id="c-fr-0003]
    3. A heating, ventilation and / or air conditioning device (1) according to claim 1 or claim 2, wherein said heating, ventilation and / or air conditioning device (1) comprises a single air pressure sensor (11) .
    [4" id="c-fr-0004]
    4. Heating, ventilation and / or air conditioning device (1) according to claim 1 or claim 2, according to which said heating, ventilation and / or air conditioning device (1) comprises two air pressure sensors (11a, 11b ) configured to measure respectively said primary air pressure (Pin) and said secondary air pressure (Pout).
    [5" id="c-fr-0005]
    5. A heating, ventilation and / or air conditioning device (1) according to any one of claims 1 to 4, according to which the measurement of said primary air pressure (Pin) and the measurement of said secondary air pressure ( Pout) are performed after the start of said heating, ventilation and / or air conditioning device (1).
    [6" id="c-fr-0006]
    6. A heating, ventilation and / or air conditioning device (1) according to any one of claims 1 to 5, according to which there are a plurality of reference pressure drop values (Pa re f) and the number of values of reference pressure drop (Pa re f) is equal to the number of air flows possible in the passenger compartment (21) of said motor vehicle (2).
    [7" id="c-fr-0007]
    7. Clogging detection device (3) of a cabin air filter (10) of a heating, ventilation and / or air conditioning device (1) for a motor vehicle (2) according to one of claims 1 6, according to which said clogging detection device (3) is configured to:
    - receive from at least one air pressure sensor (11) a measured primary air pressure (Pin) and a measured secondary air pressure (Pout);
    - calculate a pressure drop (Pa) from said primary (Pin) and secondary (Pout) air pressures;
    - compare said pressure drop (Pa) to at least one reference pressure drop pressure drop value (Pa re f) to a determined air flow rate (q re f).
    [8" id="c-fr-0008]
    8. clogging detection device (3) according to claim 7, according to which said clogging detection device (3) is further configured to generate an alarm (I) if said pressure drop (Pa) is greater than or equal. to said at least one reference pressure drop value (Pa re f).
    [9" id="c-fr-0009]
    9. Clogging detection method (PR) of a cabin air filter (10) of a heating, ventilation and / or air conditioning device (1) for a motor vehicle (2) according to one of claims 1 to 6, according to which said clogging detection method (PR) comprises the following steps:
    - measurement by at least one air pressure sensor (11) of a primary air pressure (Pin) at the inlet of said cabin air filter (10);
    - Measurement by said at least one air pressure sensor (11) of a secondary air pressure (Pout) at the outlet of said cabin air filter (10);
    - calculation by a clogging detection device (3) of a pressure drop (Pa) from said primary (Pin) and secondary (Pout) air pressures;
    - Comparison by said clogging detection device (3) of said pressure drop (Pa) with at least one reference pressure drop value (Pa re f) at a determined air flow (qref) ·
    [10" id="c-fr-0010]
    10. Clogging detection method (PR) according to claim 9, according to which, if said pressure drop (Pa) is greater than or equal to said at least one reference pressure drop value (Pa re f), said method clogging detection (PR) further comprises a step of generating an alarm (I).
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    同族专利:
    公开号 | 公开日
    FR3081781B1|2020-05-29|
    引用文献:
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    法律状态:
    2019-06-28| PLFP| Fee payment|Year of fee payment: 2 |
    2019-12-06| PLSC| Search report ready|Effective date: 20191206 |
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    申请号 | 申请日 | 专利标题
    FR1854755A|FR3081781B1|2018-06-01|2018-06-01|HEATING, VENTILATION AND / OR AIR CONDITIONING DEVICE FOR A MOTOR VEHICLE COMPRISING AT LEAST ONE AIR PRESSURE SENSOR|
    FR1854755|2018-06-01|FR1854755A| FR3081781B1|2018-06-01|2018-06-01|HEATING, VENTILATION AND / OR AIR CONDITIONING DEVICE FOR A MOTOR VEHICLE COMPRISING AT LEAST ONE AIR PRESSURE SENSOR|
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