WO2018142072A1 - Method and device for monitoring the wear of a particle filter placed in an air circuit of an air conditioning system for a vehicle - Google Patents

Abstract

The invention concerns a method for monitoring the clogging of at least one particle filter (13) equipping an air conditioning system (1) of a vehicle. The invention also relates to a monitoring device (14) suitable for implementing the method of the invention. The method of the invention comprises at least one calculation step (E2) identifying a clogging state (22) of the particle filter (13) based on at least two parameters (17a, 17b). A first parameter (17a) relates to the flow rate of at least one air flow (F3) generated by a motor fan unit (6) of the air conditioning system (1) and passing through the particle filter (13). The second parameter (17b) relates to the concentration of particles contained in the air flow (F3).

Description

 FIELD OF THE INVENTION AND METHOD FOR MONITORING THE WEAR OF A PARTICLE FILTER PLACED ON AN AIR CIRCUIT OF AN AIR CONDITIONING INSTALLATION FOR A VEHICLE The field of the present invention is that of the air conditioning installations fitted to vehicles, especially automobiles. The invention relates to the methods of purifying a flow of air circulating inside such an air conditioning installation. More specifically, the invention relates to methods and / or devices for monitoring the wear of a particle filter traversed by the airflow.

The air conditioning installations for a vehicle are organized to treat the air of the passenger compartment of the vehicle. Such an installation provides ventilation of the passenger compartment and / or a heat treatment of at least one air flow routed to the passenger compartment. From the heating and / or cooling of the air flow, the ambient air of the cabin can be brought to a set temperature to improve the comfort of the passengers.

The installation generally comprises at least one motor-fan unit generating a flow of air flowing through various ducts of the installation. The air flowing through the ducts is in particular outside air coming from the outside of the vehicle and / or the recycled air, that is to say coming from the passenger compartment. One or more shutters then make it possible to regulate the respective amounts of outside air and / or recycled air from which the flow of air flowing through the ducts of the installation to the passenger compartment originates. The air flow contains suspended particles and / or carries unwanted odors coming from the air taken from the external environment of the vehicle and / or the recycled air taken from the passenger compartment which is also more or less flawed . It is therefore common to equip the air conditioning installations with air purification devices making it possible to best remove particles and / or odors contained in the air of the passenger compartment and / or in the air. outside. Such purification devices include in particular one or more particulate filters placed in the path of the air flow. However, particulate filters clog in use with the effect of losing their effectiveness and to obstruct the flow of air through them, which induces significant pressure losses in the installation. To overcome this drawback, a common solution is to regularly replace the particulate filters in an estimated period of predefined life. Such a solution, however, has the disadvantage of having to replace a particulate filter whose wear state resulting from clogging is not proven, or to replace the particulate filter too late after it was clogged.

To avoid replacement of a particulate filter in use condition, it is known to estimate its clogging by a visual indicator of wear integrated in the filter or by evaluation of its fouling. It has also been proposed, for example by the document EP1238838 (P ARAGON), to evaluate the gaseous pollution supported by a particulate filter to deduce its clogging state. It is useful to seek solutions to improve the accuracy and reliability of the monitoring of the clogging of one or more particulate filters fitted to a vehicle air conditioning installation, in particular an automobile.

The subject of the invention is a method for monitoring the clogging of a particulate filter fitted to an air conditioning installation for a vehicle, in particular an automobile. The invention also relates to a device for monitoring the clogging of an organized particle filter for implementing the method of the invention, and an air conditioning installation equipped with such a monitoring device. The object of the invention is to avoid the unnecessary replacement of the particulate filter whose clogging is not proven or the late replacement of a clogged particulate filter, from a reliable and accurate assessment of its possible clogging .

Another object of the invention is to propose such a method and a monitoring device which are economically viable with regard to the advantages provided.

The method of the invention comprises at least one calculation step identifying a state of clogging of the particulate filter from at least two parameters. A first parameter is relative to the flow rate of at least one air flow generated by a motor-fan unit of the air conditioning installation and passing through the particulate filter. A second parameter relates to the concentration of particles contained in the airflow. The evaluation of the clogging state of the particulate filter is achieved by correlating correlation between data relating to the pollution of the air flow and data relating to the amount of effective air circulating through the particulate filter. Such a quantity of air is notably identified from the activation modalities of the motor-fan unit. The pollution of the air flow can be identified by a particle sensor, such as in particular an optical sensor, placed on the path traveled by the air flow in particular upstream of the particulate filter.

Taking into account the activation modalities of the motor-fan unit makes it possible to reliably and accurately identify the concentration of particles that the particulate filter actually receives. Taking into account the concentration of particles contained upstream in the airflow also contributes to this identification, and makes it possible to monitor the quantity of particles present in the air stream to be filtered, regardless of the source of the sample. the air from which the flow of air is generated, including outside air from outside the vehicle and / or recycled air from the passenger compartment of the vehicle.

The process can be implemented without inducing a significant additional cost of the installation or in other words without impairing its economic competitiveness with regard to the performance obtained from the monitoring of any clogging of the particulate filter.

More particularly, the calculation step identifies the clogging state of the particle filter by taking temporally into account the concentrations of particles contained in the air flow with flow rates of this air flow which passes through the particulate filter. The flow rate of a given airflow to be filtered through the particulate filter and / or its particle concentration may vary during the period of its generation by the motor-fan unit between an activation phase and a stopping phase. of the fan motor unit. The calculation step identifies the clogging condition of the particulate filter by holding account possible variations in flow rate of the air flow and / or its concentration of particles during the duration of their generation. The relevance and the reliability of the identification of the clogging state of the particulate filter are reinforced. According to one embodiment, the calculation step comprises at least one operation for calculating the number of particles retained inside the particle filter traversed by the air flow, taking into account at least one value of the second parameter and a correlation between values of the first parameter. The values of the first parameter include at least one activation period of the motor-fan unit and a power consumed by the motor-fan unit to generate the air flow.

The duration of activation of the motor-fan unit is for example determined by a measurement of a duration of power supply of the motor-fan unit. The power consumed by the motor-fan unit to generate the air flow is for example determined by a voltage and an intensity of the electric current consumed by the motor-fan unit during the activation period.

Additionally, the values of the first parameter are at least one position of at least one flap regulating the flow of air within the air conditioning installation.

The measurement of the flow rate of the air passing through the particulate filter is refined by taking into account the position of at least one flap of the installation regulating the circulation of the air flow inside and / or out. from the air conditioning installation to the passenger compartment. The relevance and accuracy of the first parameter are reinforced, which increases the reliability of the identification of the clogging of the particulate filter. In other words, the measurement of the flow rate of the air flow passing through the particulate filter can be refined by taking into account the position of at least one flap which is in particular placed upstream of the particulate filter in the direction of flow of the flow. air through the installation and / or at least one flap regulating the admission of the air flow out of the air conditioning installation to the passenger compartment. The flap or shutters whose position is taken into account in the values of the first parameter are for example at least one component regulating the respective quantities of the outside air and / or the recycled air from which the air flow originates, and / or for example another one or several flaps regulating the evacuation of the air flow out of the air conditioning installation and its admission into the passenger compartment.

The position of the flap is in particular identified by at least one position sensor with which it is equipped, which makes it possible to increase the reliability of the identification of the clogging of the particulate filter while avoiding to induce a significant additional cost of the installation of air conditioning. Such position sensors are, for example, integrated into an operating actuator for the shutter, such as, in particular, an electric motor for operating the shutter step by step, the activation of which is controlled by a control module of the air conditioning installation. .

According to one embodiment, a value of the second parameter is measured upstream of the particle filter in the direction of flow of the air flow therethrough. For example, at least one particle sensor may be placed upstream near the particle filter and / or inside a duct of the air conditioning installation conveying the air flow to the particulate filter .

According to one embodiment, the calculation operation more specifically comprises an addition of the number of particles retained inside the particle filter traversed by the air flow with a number of particles retained inside the particulate filter. identified by at least one prior calculation operation.

The calculation step is thus performed for each of several air streams successively generated by the motor-fan unit. The state of clogging of the particulate filter is identified at the end of the calculation step by adding the numbers of particles retained in the particle filter which are successively calculated for each of the air flows.

In this way, the characteristics characteristic of each of the air flows successively passing through the particle filter are identified successively in order to identify the state of clogging of the particulate filter. In particular, it takes into account the flow rate and / or the concentration of specific particles of each of the air flows successively passing through the particulate filter. The relevance and the reliability of the identification of the clogging state of the particulate filter are improved. According to one embodiment, the calculation step comprises, at the end of the calculation operation, an operation for identifying the clogging state of the particulate filter. The clogging state of the particulate filter is in particular deduced by the computation unit by comparison between a clogging data taking into account the number of particles retained overall on or inside the particulate filter and a predefined clogging threshold. particle filter identifying a threshold of use of the particulate filter.

The clogging state of the particulate filter may take into account the number of particles retained overall on or within the particulate filter and / or, separately or in combination, a clogging rate of the particulate filter deduced by the computing unit from the number of particles retained overall on or inside the particulate filter. In other words, the clogging data relates to the number of particles retained overall on or inside the particulate filter and / or relates to the clogging rate of the particulate filter. Thus according to one embodiment, the clogging state of the particulate filter is identified by comparison between the number of particles retained overall on or inside the particulate filter and a predefined reference number identifying the clogging threshold of the filter. with particles. Thus still in isolation or in combination with the preceding provisions, the clogging state of the particulate filter is identified by comparison between a clogging rate of the particulate filter deduced from the number of particles retained overall on or inside the particulate filter. and a predefined reference rate identifying the clogging threshold of the particulate filter.

The clogging rate of the particulate filter is identified by the proportion of the number of particles retained overall on or inside the particulate filter relative to the reference number, to identify the clogging state of the particulate filter. The rate of clogging can then be compared with the reference rate identifying the clogging threshold of the particulate filter to assess the need for its replacement.

In the case where a saturation of the particulate filter is identified according to the clogging threshold of the particulate filter, an alert signal is for example generated to indicate by a communication vector perceptible by the man that it is necessary to replace the particle filter.

In other words according to one embodiment, the method comprises, at the end of the calculation step, an operation of generating an alert signal in the case where the clogging state of the particulate filter is greater than or equal to the clogging threshold of the particulate filter.

The generation of the warning signal reveals a wear of the particulate filter requiring replacement. The warning signal is for example transmitted to an indicator that can be placed on the dashboard of the vehicle and / or integrated into a screen fitted to the dashboard of the vehicle. The warning signal may for example still be a radiofrequency signal adapted to be picked up by at least one radio frequency receiver previously listed, such as a cell phone for example.

More specifically, the method comprises at least for each successive and distinct phases of circulation of the air flow, a cycle of operations comprising at least the following steps:

 - A first step of detecting an activation of the motor-fan unit by a monitoring module that includes the air conditioning installation. The monitoring module can be integrated or be formed by a control module of the motor-fan unit. The first step also comprises an acquisition by the monitoring module of the values of the identification parameters of the clogging state of the particulate filter, in particular the values of the first parameter and the values of the second parameter.

- A second calculation step by a calculation unit that includes the monitoring module, the clogging state of the particulate filter from the values acquired during the first step. The first step includes an acquisition by the monitoring module of at least a first value relating to the voltage of the electric current consumed by the motor-fan unit during the operating cycle and a second value relating to the concentration. of particles contained in the airflow.

Preferably, the first step further comprises an acquisition by the monitoring module of at least a third value relating to a position of at least one flap for regulating the circulation of the flow of air inside the chamber. air conditioning installation.

According to one embodiment, the second step implements an addition by the calculation unit of the number of particles retained inside the particle filter from the values acquired during the first step, with a number of particles that is first identified during the execution of at least one previous operation cycle and which is stored in a first memory.

The values acquired by the monitoring module during the first step are in particular provided by the motor-fan unit and / or by a control module of the air conditioning installation and / or by a particle and / or or by a shutter position sensor, this acquisition of values being effected during a period of activation of the motor-fan unit generating the air flow. For each of the periods of activation of the motor-fan unit, it is notably taken into account the power consumed by the motor-fan unit and the particulate concentration measured in the air flow.

More particularly, the first value is in particular provided by the fan motor unit and / or by a control module for its operation which comprises the air conditioning installation and which regulates at least the use of the motor-fan unit. The second value is in particular provided by the particle sensor which is for example installed inside a duct of the air conditioning installation housing the particle filter. The third value is for example provided by an operating actuator of the shutter and / or by the control module which also regulates the open position of at least one flap of the air conditioning installation.

The particle sensor is preferably placed upstream of the particulate filter in the direction of flow of the air flow therethrough. The particle sensor is for example placed inside a duct of the installation housing the particle filter. The particulate sensor may be disposed at various locations within or outside the air conditioning installation, such as, for example, on a calender or vehicle headlamp for assessing particle pollution from outside air. surrounding the vehicle from which a flow of outside air generated by the fan motor unit and circulating inside the air conditioning installation originates.

The cycle of operations comprises, in the alternative, a third step comprising an operation of identification by the calculation unit of the clogging rate by comparison between the number of particles retained inside the particulate filter and the reference number. Then, the third step comprises a comparison operation by the calculation unit between the clogging rate and the reference rate, the reference number and the reference rate being stored in a second memory of the monitoring module. According to an example, the method comprises, at the end of the cycle of operations, a fourth step comprising an operation of generating an alert signal in the case where the clogging state of the particulate filter is greater than or equal to at a clogging threshold identifying a threshold of use of the particulate filter. The alert signal is generated in particular by an alert unit that includes the monitoring module.

According to one embodiment, the fourth step comprises an operation of displaying an indicator and / or a remote transmission operation of the alert signal. The indicator is in particular generated by a display member that includes the alert unit and which is activated following the generation of the warning signal. The remote transmission of the warning signal is in particular carried out by a radiofrequency signal transmitter that includes the warning unit. The indicator or in other words the display member and / or the transmitter are notably active by the calculation unit in the case where the clogging state of the particle filter is greater than or equal to the threshold of clogging.

The invention also relates to a device for monitoring a clogging state of a particulate filter equipping a vehicle air conditioning installation. The device is organized for the implementation of a method according to the invention.

The device comprises in particular at least the motor-fan unit and a monitoring module comprising at least one unit for calculating the clogging state of the particulate filter. The calculation unit identifies the clogging condition of the particulate filter from values provided at least by the motor-fan unit and by a particle sensor capable of measuring a concentration of particles contained in the air flow.

Preferably, the monitoring module also comprises at least one position sensor configured to detect the position of at least one flap of the air conditioning installation. Said at least one flap is in particular a flap provided to be disposed on the path traveled by the air flow upstream of the particulate filter.

Preferably, the particle sensor is an optical sensor capable of measuring in absolute value the concentration of particles contained in the air flow. Such an optical sensor is particularly capable of identifying a concentration of particles in an air flow, including fine particles that may be of a size less than or equal to 2.5μιη.

More specifically, the monitoring module comprises the computing unit, a data storage unit comprising the first memory and the second memory, and the alert unit.

Preferably, the alerting unit comprises an alarm signal generator, the indicator and / or a radiofrequency signal transmitter to a signal receiver. radio frequency capable of cooperating with the transmitter. The radio frequency signal receiver is for example a cell phone assigned to the vehicle owner and / or a radio frequency signal receiver available to a vehicle maintenance agent.

The invention also relates to an air conditioning installation for a vehicle, in particular an automobile, equipped with a device according to the invention.

Other features, details and advantages of the invention will emerge more clearly on reading the detailed description given below as an indication and, for example, in relation to the drawings of the accompanying plates, in which:

 - Figure 1 is a schematic illustration of an air conditioning installation of a vehicle equipped with a monitoring device according to the invention for monitoring the clogging state of a particulate filter.

 FIG. 2 is a flowchart illustrating a method according to the invention implemented by the monitoring device represented in FIG. 1.

The figures and their description set forth the invention in detail and according to particular methods of its implementation. They can of course serve to better define the invention.

In Figure 1, an air conditioning installation 1 is organized to equip a vehicle, including a motor vehicle. The air conditioning installation 1 comprises a housing 2 provided with at least one inlet mouth 3 for the admission of an outside air flow Fl whose air comes from the external environment to the cabin 5 of the vehicle. The casing 2 is also provided with at least one outlet mouth 4 for evacuating out of the casing 2 of a flow of air F4 to be distributed towards the passenger compartment 5 of the vehicle to improve its comfort. The housing 2 houses a motor-fan unit 6 to generate the air flow F4 to be distributed to the passenger compartment 5 from the outside air flow Fl and / or from a recycled air flow F2. ie whose air comes from the cockpit 5.

An activation of the motor-fan unit 6 by a control module 7 generates the outside air flow Fl for the outside air intake inside the installation of air conditioning 1 and / or the flow of recycled air F2 then flowing through the air conditioning installation 1. The outside air flow Fl circulates through a first duct 8a and the recycled air stream F2 flows through a second conduit 8b. A flap 9 regulates the respective amounts of outside air and recycled air from which the flow of air F4 to be distributed to the passenger compartment 5.

In the illustrated example, the first duct 8a and the second duct 8b converge towards a mixing chamber 10 which, for example, houses the fan motor unit 6. The shutter 9 is placed at the point of convergence between the first duct 8a and the second leads 8b. Maneuvering the shutter 9 makes it possible to regulate the admission into the mixing chamber 10 of the outside air flow Fl and of the recirculated air flow F2, alone or in combination in respective air quantities.

The mixing chamber 10 opens onto a third conduit 8c for discharging an air flow F3 from the mixing chamber 10 to an apparatus 11 for heat treatment of the air flow F3 from which the air flow originates F4 to distribute. The heat treatment apparatus 11 comprises in particular an evaporator 11a and / or a heat exchanger 11b. The heat exchanger 11b comprises a radiator 12a with fluid circulation and / or an electric radiator 12b of cells with a positive temperature coefficient. A flap 12c regulates the amount of air flowing through the heat exchanger 11b for heating or bypass.

One or more particulate filters 13 are disposed inside at least one of the ducts 8a, 8b, 8c through which flows the air from which the flow of air F4 to be dispensed. In the illustrated example, a first particulate filter 13 is placed in the third conduit 8c to filter the air flow F3 discharged from the mixing chamber prior to its distribution to the heat treatment apparatus 11. Other particulate filters 13a, 13b may also be placed inside the first duct 8a to filter the outside air flow Fl and / or inside the second duct 8b to filter the recycled airflow F2 prior to their admission into the mixing chamber 10.

The described example of the architecture of the air conditioning installation 1 is given for illustrative purposes and is not restrictive as to the scope of the invention. There is the problem of monitoring the clogging of at least one of the particulate filters 13 fitted to the air-conditioning installation 1, such as, for example, the monitoring of the particulate filter 13 placed in the third duct 8c. which will be described.

For this purpose in FIG. 1 and FIG. 2, the air conditioning installation 1 is equipped with a monitoring device 14 organized to monitor the clogging state 22 of the particulate filter 13 and, if necessary, to warn of its saturation in particles for its replacement. The clogging state 22 of the particulate filter 13 is notably identified by taking temporally into account the concentrations of particles contained in the air flow F3 passing through the particulate filter 13 with flow rates of this air flow F3.

The monitoring device 1 comprises a monitoring module 15 provided with a calculation unit 16 identifying the clogging state 22 of the particle filter 13 by calculating the number of particles retained inside the particle filter 13 for each of the activation phases of the motor-fan unit 6. The number of particles N3 retained overall on or inside the particulate filter 13 is calculated by adding 23 the number of particles NI calculated during an activation phase of the group motor-fan 6 with the number of particles N2 retained inside the particle filter 13 calculated during a calculation operation 21, 23 anterior.

The calculation of the number of particles retained inside the particulate filter 13 takes into account a first parameter 17a relating to the flow rate of the airflows F3 successively generated by the motor-fan unit 6, the calculation of the number of particles retained at the inside of the particulate filter 13 also takes into account a second parameter 17b relating to the concentration of particles contained in these airflows F3. In a first step E1, values Via, Vlb, Life of the first parameter 17a and at least one value V2 of the second parameter 17b are collected by the calculation unit 16. Then in a second step E2, the calculation unit 16 determines by calculation the number of particles retained inside the particulate filter 13 to identify its clogging state 22.

The values of the first parameter are at least one duration Via activation of the motor-fan unit 6, a voltage and / or an intensity Vlb of the electric current consumed by the motor-fan unit 6 during its duration Via activation and / or a life position of the shutter 9 regulating the respective amounts of outside air and recycled air from which the air flow F3 is derived. The values Via, Vlb, Life of the first parameter 17a can for example be provided by the motor-fan unit 6, by the control module 7 controlling the operation of the motor-fan unit 6 and / or the position of the flap 9, and / or by a position sensor 18 which identifies the life position of the flap 9 and which is integrated in a motorisation 19 for operating the flap 9. The value V2 of the second parameter 17b is in particular provided by a particle sensor 20 placed on the path of the air flow F3 upstream of the particulate filter 13 in its direction SI circulation through the air conditioning installation 1, as in the example shown inside the mixing chamber 10. The second step E2 implements a calculation operation 21, 23 comprising a calculation 21 of the number of particles NI retained inside the particle filter 13, from the values Via, Vlb, Life, V2 of the first parameter 17a and the second parameter 17b acquired 1 7 by the calculation unit 16 during the first step E1. Then, the calculation unit 16 performs a calculation 23 determining a clogging state 22 of the particle filter 13, by adding the number of particles NI previously calculated with the number of particles N2 already retained inside the particulate filter 13. The number of particles N2 already retained inside the particle filter 13 has been calculated during a previous calculation step E2 and has been stored at the same time. from this previous calculation step E2 in a first memory 24a of a data storage unit 24 that comprises the monitoring module 15.

Such an addition makes it possible to deduce the number of particles N3 retained overall on or inside the particulate filter 13 and thus its clogging state 22. A possible saturation of the particle filter 13 is then identified by comparison between the number of particles. N3 particles retained overall on or inside the particulate filter 13, and a predefined reference number NR. The reference number NR is stored in a second memory 24b of the data storage unit 24 and identifies in particular a clogging threshold of the particulate filter 13.

Alternatively according to the exemplary embodiment illustrated, the clogging state 22 can also be identified from a clogging rate T1 of the particulate filter 13. The clogging rate T1 is deduced by the calculation unit 16 from the number of particles N3 retained overall on or inside the particulate filter 13. The calculation unit 16 then identifies in a third step E3 the clogging rate T1 of the particulate filter 13 by calculation of the proportion of the number N3 of particles retained overall on or inside the particulate filter 13 with respect to the reference number NR. Then, a possible saturation of the particle filter 13 is then identified by comparison 26 between the clogging rate T1 and a reference rate TR which identifies a clogging threshold of the particle filter 13 and which is stored in the second memory 24b.

In the case where the number of particles N3 retained overall on or inside the particulate filter 13 is lower than the reference number NR and / or in the case where the clogging rate T1 is lower than the reference rate TR, a A new cycle of operations for calculating the number of particles N3 retained overall on or inside the particulate filter 13 is performed, provided that the activation of the motor-fan unit 6 is maintained. For the same activation phase of the motor-fan unit 6, the operating cycle is thus repeated, preferably at a predefined frequency. In other words, for the same activation phase of the motor-fan unit 6, the clogging state 22 of the particle filter 13 is iteratively identified.

In the case where the number of particles N3 retained overall on or inside the particulate filter 13 is greater than the reference number NR and / or in the case where the clogging rate T1 is greater than or equal to the reference rate TR , an alert unit 27 signals in a fourth step E4 that the particle filter 13 must be replaced because of its saturation. A generator 27a emits an alert signal 28 which is transmitted to an indicator 27b and / or to a transmitter 27c of radio frequency signals 29 able to transmit 29b the warning signal 28 to at least one receiver 30. The receiver 30 is potentially the indicator 27b and / or a cell phone and / or terminal available for a maintenance agent of the air conditioning installation. The foregoing description clearly explains how the invention makes it possible to achieve the objectives it has set itself and in particular to propose a method and a monitoring device that make it possible to control in a relevant and reliable way, particularly at moderate costs, a actual and actual clogging state of a particulate filter equipping a packaging plant for a vehicle.

Of course, various modifications can be made by those skilled in the art to the method and the monitoring device according to the invention, in particular as regards the methods for calculating the clogging state of the particulate filter from the first parameter. and the second parameter. The method and the monitoring device which have just been described as non-limiting examples and their use will be constituted as soon as their main characteristics are identified.

In any event, the invention can not be limited to the embodiments specifically described in this document, and extends in particular to all equivalent means and to any technically operating combination of these means.

Claims

1. A method for monitoring the clogging of at least one particulate filter (13) equipping an air conditioning installation (1) of a vehicle, the method comprising at least one calculation step (E2) identifying a state of clogging (22) of the particulate filter (13) from at least two parameters (17a, 17b), a first parameter (17a) relating to the flow rate of at least one air flow (F3) generated by a motor-fan unit (6) of the air conditioning system (1) passing through the particle filter (13), and a second parameter (17b) relating to the concentration of particles contained in the air flow (F3). 2. Method according to the preceding claim, wherein the calculation step (E2) identifies the clogging state (22) of the particulate filter (13) taking temporally into account concentrations of particles contained in the air flow. (F3) with flow rates of this air flow (F3) passing through the particulate filter (13). 3. Method according to any one of the preceding claims, wherein the calculation step (E2) comprises a calculation operation (21, 23) of the number of particles (N3) retained overall on or inside the filter. particles (13) traversed by the air flow (F3) taking into account at least one value (V2) of the second parameter (17b) and a correlation between values of the first parameter (17a) comprising at least one duration (Via) activating the motor-fan unit (6) and a power consumption (Vlb) by the motor-fan unit (6) to generate the air flow. 4. The method of claim 3, wherein the values of the first parameter (17a) are at least one position (Life) of at least one flap (9) for regulating the flow of air flow (F3) to the inside the air conditioning system (1). The method of any one of claims 3 to 4, wherein the value (V2) of the second parameter (17b) is measured upstream of the particle filter (13), according to the direction (SI) of circulation of the air flow (F3) therethrough. 6. Method according to any one of claims 3 to 5, wherein the calculation operation (21, 23) comprises an addition (23) of the number of particles (NI) retained at the interior of the particulate filter (13) traversed by the air flow (F3) with a number of particles (N2) retained within the particulate filter (13) identified by at least one calculating operation (21). 23). 7. Method according to any one of claims 3 to 6, wherein the calculation step (E2) comprises, after the calculation operation (21, 23), an identification operation of the clogging state (22) of the particulate filter (13) by comparison between a clogging data (N3, Tl), taking into account the number of particles (N3) retained overall on or inside the particulate filter (13). ), and a predefined clogging threshold (NR, TR) of the particulate filter (13) identifying a threshold of use of the particulate filter (13). 8. The method of claim 7, wherein the clogging state (22) of the particulate filter (13) is identified by comparison (25) between the number of particles (N3) retained overall on or inside the filter with particles (13) and a predefined reference number (NR) identifying the clogging threshold of the particulate filter (13). 9. A method according to any one of claims 7 and 8, wherein the clogging state (22) of the particulate filter (13) is identified by comparison (26) between a clogging rate (Tl) of the particulate filter (13) deduced from the number of particles (N3) retained overall on or inside the particulate filter (13) and a predefined reference ratio (TR) identifying the clogging threshold of the particulate filter (13). The method according to any one of claims 7 to 9, wherein the method comprises, after the calculation step (E2), an operation of generating an alert signal (28) in the when the clogging state (22) of the particulate filter (13) is greater than or equal to the clogging threshold (NR, TR) of the particulate filter (13). 11. Method according to any one of the preceding claims, comprising at least for each of successive and distinct phases of circulation of the air flow (F3), a cycle of operations comprising at least the following steps: -) a first step (El) for detecting an activation of the motor-fan unit (6) by a monitoring module (15) that comprises the air conditioning installation (1), and acquisition by the monitoring module (15) of the values (Via, Vlb, Life, V2) of the parameters (17a, 17b) for identifying the clogging state (22) of the particulate filter (13), -) a second calculation step (E2) (21, 23) by a calculation unit (16) that comprises the monitoring module (15), the clogging state (22) of the particulate filter (23) to from the values (Via, Vlb, Life, V2) acquired during the first step (El). The method of claim 11, wherein the first step (E1) comprises an acquisition (17) by the monitoring module (15) of at least a first value (Via, Vlb) relating to the voltage of the electric current consumed by the motor-fan unit (6) during the operating cycle and a second value (V2) relative to the concentration of particles contained in the flow of air (F3). The method according to claim 12, wherein the first step (E1) comprises an acquisition by the monitoring module (15) of at least a third value (Life) relative to a position of at least one flap ( 9) regulating the flow of air flow (F3) inside the air conditioning installation (1). 14. A method according to any one of claims 11 to 13, wherein the second step (E2) implements an addition (23) by the calculation unit (16) of the number of particles (NI) retained in the inside the particle filter (13) from the acquired values (Via, Vlb, Life) during the first step (El), with a number of particles (N2) which is previously identified during the execution of at least a previous operation cycle and which is stored in a first memory (24a). The method according to any one of claims 11 to 14, wherein the values (Via, Vlb, Life, V2) acquired by the monitoring module (16) during the first step (El) are provided by the group. motor-fan (6) and / or by a control module (7) of the air conditioning system (1) and / or by a particle sensor (20) and / or by a position sensor (18) ) of the flap (9), this acquisition of values being effected during an activation period of the motor-fan unit (6) generating the air flow (F3). The method according to any one of claims 11 to 15, wherein the operation cycle comprises a third step (E3) comprising an identification operation by the calculation unit (16) of the clogging rate (Tl). by comparison (25) between the number of particles (N3) retained within the particulate filter (13) and the reference number (NR), then a comparison operation (26) by the calculation unit (16). ) the rate of clogging (Tl) and the reference rate (TR), the reference number (NR) and the reference rate (TR) being stored in a second memory (24b) of the monitoring module (16). 17. A method according to any one of claims 11 to 16, wherein the method comprises, at the end of the cycle of operations, a fourth step (E4) comprising an operation for generating an alert signal (28). ) in the case where the clogging state (22) of the particulate filter (13) is greater than or equal to a clogging threshold (NR, TR) identifying a utilization threshold of the particulate filter (13). The method of claim 17, wherein the fourth step (E4) comprises an operation of displaying an indicator (27b) and / or a remote transmission operation (29) of the alert signal (28). 19. Device for monitoring (14) a clogging condition (22) of a particulate filter (13) fitted to an air conditioning installation (1) of a vehicle, suitable for the implementation of a process according to any one of the preceding claims. 20. Monitoring device (14) according to claim 19, comprising at least the motor-fan unit (6), a monitoring module (15) comprising at least one calculation unit (16) of the clogging state (22). ) of the particle filter (13) from values (Via, Vlb) supplied by at least the motor-fan unit (6) and by a particle sensor (20) capable of measuring a concentration of particles contained in the flow of air (F3). 21. Monitoring device (14) according to claim 20, wherein the monitoring module (15) comprises at least one position sensor (18) configured to detect the position of at least one flap (9) of the installation. air conditioning (1). The monitoring device (14) according to any one of claims 20 and 21, wherein the particle sensor (20) is an optical sensor. 23. Monitoring device (14) according to claim 22, wherein the particle sensor (20) is placed upstream of the particulate filter (13), in the direction (SI) of circulation of the air flow (F3). through it. The monitoring device (14) according to any one of claims 20 to 23, wherein the monitoring module (15) comprises the computing unit (16), a data storage unit (24) comprising the first memory (24a) and the second memory (24b), and the alert unit (27). The monitoring device (14) of claim 24, wherein the alerting unit (27) comprises a warning signal generator (27a) (28), an indicator (27b) and / or a transmitter ( 27c) radiofrequency signals (29) to a receiver (30) of radio frequency signals adapted to cooperate with the transmitter (27c). 26. Air conditioning installation (1) for a motor vehicle, equipped with a monitoring device (14) according to any one of claims 20 to 25.