MOTOR VEHICLE FEATURING A MONITORING DEVICE FOR AN ELECTRIC MOTOR COOLING CIRCUIT

Abstract

The invention relates to a motor vehicle (1000) comprising a supervisor (500) of electric traction machines (101, 102) powered by an OBCDC converter (150) and temperature regulated by a cooling circuit (200) comprising a three-way solenoid valve (420) whose response to the instructions emanating from the supervisor (500) is monitored by the supervisor (500), by memorizing the temperatures measured periodically by the OBCDC converter (150) and by each electric traction machine (101, 102), and by monitoring the temperature gradient in the cooling circuit (200), by comparing the measured temperatures, on the one hand in a first temperature reading directly preceding a state change command addressed by the supervisor (500) to the solenoid valve (420), and on the other hand in a second temperature reading following this state change,and to diagnose any malfunction of said at least one solenoid valve (420), and / or initiate a reconfiguration. Figure 1,

Description

Title of the invention: MOTOR VEHICLE COMPRISING A MONITORING DEVICE FOR AN ELECTRIC MOTOR COOLING CIRCUIT

[0001] The invention relates to an electric or hybrid motor vehicle comprising control means themselves comprising a supervisor, the motor vehicle comprising at least one electric traction machine, powered by at least one OBCDC converter, a cooling circuit arranged for temperature regulation of at least one electric traction machine, said supervisor being arranged to monitor said cooling circuit which comprises at least one heat transfer fluid circuit, the circulation of which is regulated by circulation management means interfaced with the supervisor to ensure optimal temperature regulation of each electric traction machine comprising the motor vehicle,The circulation management means include at least one circulation pump arranged to move the heat transfer fluid and at least one solenoid valve arranged to allow or prevent the circulation of said heat transfer fluid in at least a part of said cooling circuit.

[0002] The invention lies in the field of monitoring the proper following of instructions emanating from a powertrain supervisor, by means of circulation management which includes a heat transfer circuit integrated into a cooling circuit arranged for the temperature regulation of at least one electric traction machine of an electric or hybrid motor vehicle.

[0003] It is known in the prior art of means for monitoring the temperature of a battery or its cooling circuit.

[0004] French patent FR3121995A1 relates to an electric, hybrid, or internal combustion engine vehicle comprising a battery to which several current consumers must be electrically connected. Some low-power consumers may be powered indirectly by a vehicle computer or supervisor. A current converter, including its own OBCDC control means, is coupled to the main battery by a second high-voltage charging cable. A measuring unit includes, for example, a temperature, current, and voltage sensor for the secondary battery. The vehicle has a heat transfer fluid circuit in thermal contact with the module and / or the cell of the main battery. A temperature sensor, which outputs a temperature value, is immersed in the heat transfer fluid at an outlet of the circuit after this fluid has been heated by the module or the cell of the main battery.

[0005] French patent FR3120274A1 relates to a method for controlling a vehicle battery comprising a means for measuring and monitoring a battery temperature, and a means for cooling the battery, this method executing a first step controlling the cooling means in regulation on a setpoint in battery temperature when the battery temperature is below a first upper threshold, and a second step activating the cooling means at its maximum when this temperature exceeds the first upper threshold, and when the temperature exceeds a second upper threshold strictly higher than the first upper threshold, the method executes a third step which simultaneously limits the output power of the main battery, and maintains the cooling means at the maximum of its cooling capacity.

[0006] The objective of the present invention is to remedy these drawbacks by providing a device for the reliable detection of a possible defect in a solenoid valve, in order to prevent any unnecessary dismantling or even exchange of another component of the vehicle by the after-sales service.

[0007] To achieve this objective, the invention proposes an electric or hybrid motor vehicle comprising control means themselves comprising a supervisor, the motor vehicle comprising at least one electric traction machine, powered by at least one OBCDC converter, a cooling circuit arranged for temperature regulation of at least one electric traction machine, said supervisor being arranged to monitor said cooling circuit which comprises at least one heat transfer fluid circuit, the circulation of which is regulated by circulation management means interfaced with the supervisor to ensure optimal temperature regulation of each electric traction machine comprising the motor vehicle,The circulation management means include at least one circulation pump arranged to move the heat transfer fluid and at least one solenoid valve arranged to allow or prevent the circulation of said heat transfer fluid in at least a part of said cooling circuit.

[0008] According to the invention, the supervisor is arranged to monitor the proper functioning of at least one solenoid valve, and the response of at least one solenoid valve to the commands emanating from said supervisor, by storing the temperatures measured periodically by the OBCDC converter and by each said electric traction machine and by monitoring the temperature gradient in the cooling circuit, by comparing the measured temperatures, firstly in a first temperature reading during a measurement interval immediately preceding a state change command sent by the supervisor to at least one solenoid valve, and secondly in a second temperature reading during a measurement interval following the state change command, and for, if some of the temperatures of the second temperature information are not lower than the temperatures of the first temperature information, diagnose a malfunction of at least one solenoid valve.

[0009] Thanks to the invention, the dynamic monitoring of temperatures on three monitored organs allows for a precise diagnosis of a possible failure on the cooling circuit, and allows after-sales service to avoid dismantling or even exchanging a costly component when it is not necessary.

[0010] Advantageously, the supervisor is arranged to initiate a reconfiguration of said cooling circuit, if some of the temperatures of the second temperature information are not lower than the temperatures of the first temperature information.

[0011] It is thus possible to improve cooling.

[0012] Advantageously, the motor vehicle comprises at least one first electric machine and a second electric machine, and at least one solenoid valve is a three-way solenoid valve controlled by the supervisor and arranged to, depending on its position, direct the heat transfer fluid either in a first state towards a first electric machine alone, when the first electric machine exceeds a first temperature threshold calibrated in the supervisor and / or when the OBCDC converter exceeds a third temperature threshold calibrated in the supervisor, or in a second state towards a second electric machine alone, when the second electric machine exceeds a second temperature threshold calibrated in the supervisor, or in a third state towards the first electric machine and the second electric machine, in the case where the temperature of the second electric machine exceeds its said second temperature threshold,and where the temperature of said OBCDC converter and / or of the first electrical machine exceeds respectively the third temperature threshold or the first temperature threshold, i.e., in a blocking state preventing any circulation of the heat transfer fluid.

[0013] The invention is thus applicable to a vehicle comprising two electric traction motors, for example a front motor and a rear motor, and it makes it possible to distinguish which branch of the cooling circuit, or which main component, may be affected by an anomaly.

[0014] Advantageously, the supervisor is arranged to receive, at regular, calibratable time intervals, temperature information from three monitored components: the first electrical machine, the second electrical machine, and the OBCDC converter. The supervisor is arranged to, upon reaching the first temperature threshold for the first electrical machine, command the three-way solenoid valve to change state, switching to the first state if the three-way solenoid valve is in the blocking state, or to move to the third state if the three-way solenoid valve is in the second state, and the supervisor is arranged to, from said third temperature threshold for the OBCDC converter, command the three-way solenoid valve to change state, to move to the first state if the three-way solenoid valve is in the blocking state, or to move to the third state if the three-way solenoid valve is already in the second state, and the supervisor is arranged to, from the second temperature threshold for the second electrical machine, command the three-way solenoid valve to change state, to move to the second state if the three-way solenoid valve is in the blocking state, or to move to the third state if the three-way solenoid valve is in the first state.

[0015] Thus, by monitoring the temperatures of only three organs, the invention makes it possible to have a reliable diagnosis.

[0016] Advantageously, the supervisor is arranged to store each initial state and each new state of the three-way solenoid valve, respectively each initial state in an initial label "State" and each new state in a final label "FinalState", and is further arranged to, just before sending a state change command to the three-way solenoid valve, store a first initial temperature information returned by each of the three monitored components, in a first variable for a first initial temperature returned by the first electric machine, a second variable for a second initial temperature returned by the second electric machine, and a third variable for a third initial temperature returned by the OBCDC converter, and the supervisor is arranged to, once the three initial temperature values ​​are stored,send a state change command to the three-way solenoid valve to bring it to its first, second, or third state, depending on the temperature threshold that is exceeded, and the supervisor is arranged to count down an initial time after sending the state change command to the three-way solenoid valve, and, at the expiration of the initial time, store new delayed temperature information, returned by each of the three monitored devices in a first delayed variable for a first delayed temperature returned by the first electrical machine, a second delayed variable for a second delayed temperature returned by the second electrical machine, and a third delayed variable for a third delayed temperature returned by the OBCDC converter, and the supervisor is further arranged to calculate a temperature difference between the two measurements of each of the three monitored devices,namely a first temperature difference for the temperature difference on the first electrical machine over the first period, a second temperature difference for the temperature difference on the second electrical machine over the first period, and a third temperature difference, temperature for the temperature difference on the OBCDC converter over the first period, and to, in a first alternative, if the supervisor has switched the three-way solenoid valve from an initial state, which is the blocking state, to a final state, which is the first state, due to reaching the first temperature threshold, and if said supervisor observes that the first temperature difference does not fall below a first calibrable deviation threshold, initiate a first reconfiguration; in a second alternative, if the supervisor has switched the three-way solenoid valve from an initial state, which is the blocking state, to a final state, which is the first state, due to reaching the third temperature threshold, and if said supervisor observes that the third temperature difference does not fall below a third calibrable deviation threshold, initiate the first reconfiguration.In a third alternative, if the supervisor has moved the three-way solenoid valve from an initial state (the blocking state) to a final state (the second state), and if the supervisor determines that the second temperature deviation does not fall below a second calibrable deviation threshold, initiate a second reconfiguration; in a fourth alternative, if the supervisor has moved the three-way solenoid valve from an initial state (the first state) to a final state (the third state), and if the supervisor determines that the second temperature deviation does not fall below a fourth calibrable deviation threshold, initiate a second reconfiguration; in a fifth alternative, if the supervisor has moved the three-way solenoid valve from an initial state (the second state) to a final state (the third state) due to the first temperature threshold being reached,and if the supervisor determines that the first temperature deviation does not fall below a fifth calibrable deviation threshold, initiate the first reconfiguration; as a sixth alternative, if the supervisor has moved the three-way solenoid valve from an initial state (the second state) to a final state (the third state) due to reaching the third temperature threshold, and if the supervisor determines that the third temperature deviation does not fall below a sixth calibrable deviation threshold, initiate the first reconfiguration.

[0017] The supervisor is thus able to deal with all possible scenarios.

[0018] Advantageously, the first deviation threshold, the second deviation threshold, the third deviation threshold, the fourth deviation threshold, the fifth deviation threshold, and the sixth deviation threshold are calibrable thresholds whose value is between -0.5°C and -5°C.

[0019] These negative values ​​of deviation thresholds are justified by the fact that a change of state of the three-way solenoid valve must lower the temperature of the heat transfer fluid in the three monitored components.

[0020] Advantageously, the first duration is between 500 milliseconds and 2 seconds.

[0021] This ensures very rapid feedback on the temperature status in the organs monitored.

[0022] Advantageously, the first reconfiguration consists of the memorization of a first fault code by the supervisor to inform the after-sales service of a failure of the three-way solenoid valve on the branch of the first electric machine, and the second reconfiguration consists of the memorization of a second fault code by the supervisor to inform the after-sales service of a failure of the three-way solenoid valve on the branch of the second electric machine.

[0023] Thus the after-sales service knows directly on which branch a defect appeared.

[0024] Advantageously, the supervisor is arranged so that, when launching said first or second reconfiguration, it immediately triggers the lighting of a service light on the dashboard to encourage the user of said motor vehicle to go to after-sales service.

[0025] The user is thus informed, without being blocked, of the presence of a defect to be examined by the after-sales service.

[0026] Advantageously, the supervisor is arranged to maintain a said first reconfiguration or second reconfiguration, once launched, until the user turns off the ignition of said motor vehicle, and to restore a fault, by a fault code remaining stored in a read-only memory that the supervisor includes, the fault code being arranged to go from a "permanent" state to a "transient" state at the next restart of said motor vehicle, and, in the event of the next detection of the same fault, to maintain the fault code in said "permanent" state until the next restart of said motor vehicle.

[0027] Thus the after-sales service is informed of the persistence of a defect or of its transient nature.

[0028] The invention will be further detailed by describing non-limiting embodiments, and based on the accompanying figures illustrating variants of the invention, in which: - [Fig.1] is a block diagram representing a motor vehicle according to the invention, equipped with control means comprising themselves a supervisor, an OBCDC converter, two electric traction machines, and a cooling circuit comprising a heat transfer fluid circuit regulated by circulation management means comprising a circulation pump, a three-way solenoid valve, and a radiator.

[0029] A motor vehicle 1000, electric or hybrid, according to the invention, comprising steering means 900 themselves comprising a powertrain supervisor 500, hereinafter simply referred to as "supervisor", is schematically illustrated in [Fig.1].

[0030] This motor vehicle 1000 comprises, as shown in [Fig. 1], at least one electric traction machine 100, 101, 102, and a cooling circuit 200 arranged for temperature regulation of this at least one electric traction machine 100, 101, 102.

[0031] The supervisor 500 is arranged to monitor the cooling circuit 200, which includes at least one heat transfer fluid circuit, the circulation of which is regulated by circulation management means 400.

[0032] The powertrain supervisor 500 is interfaced with these traffic management means 400, to ensure optimal temperature regulation of each electric traction machine 100, which comprises the motor vehicle 1000.

[0033] More particularly, and without limitation, these circulation management means 400 comprise at least one circulation pump 410 arranged to move the heat transfer fluid, and at least one solenoid valve 420 arranged to allow or prevent the circulation of the heat transfer fluid in at least a portion of the cooling circuit 200, and at least one radiator 430 or similar. More particularly, and without limitation, this at least one solenoid valve 420 is a three-way solenoid valve.

[0034] More particularly, the invention relates to monitoring the proper functioning of this at least one solenoid valve 420, and its response to instructions emanating from the powertrain supervisor 500.

[0035] This monitoring is particularly important when the motor vehicle 1000 has several electric traction machines 100, including, but not limited to, a first electric traction machine 101 on the front axle of the motor vehicle 1000, and a second electric traction machine 102 on the rear axle of the motor vehicle 1000. In other arrangements, the motor vehicle 1000 may have an electric traction machine on each wheel of the front axle, and / or an electric traction machine on each wheel of the rear axle, or other. In all cases, it is advantageous to arrange the cooling circuit 200 so as to regulate the temperature of several electric traction machines 100 of the motor vehicle 1000, and, more particularly and but not limited to, all the electric traction machines 100 of the motor vehicle 1000.

[0036] In a particular application, and as seen in [Fig.1], for a motor vehicle 1000 comprising such a first electric traction machine 101 and such a second electric traction machine 102, the cooling circuit 200, initially intended for only the first electric traction machine 101 at the front, is arranged by adding a three-way solenoid valve 420 on the front heat transfer circuit, to make a branch intended to cool the second rear electric machine 102.

[0037] [Fig. 1] shows, in a simplified way, this cooling circuit 200, with a circulation pump 410, this three-way solenoid valve 420, a radiator 430, and an OBCDC converter 150. The invention is described for the particular and non-limiting case of two electric traction machines, and of course applies to any other configuration with a greater number of electric machines.

[0038] The invention is described here with the particular non-limiting case of a first electric machine 101 in front, and a second electric machine 102 in rear, but naturally it is applicable to any other relative configuration of the first electric machine 101 and second electric machine 102, for example right and left, or above and below, or other.

[0039] The circulation pump 410 is arranged to circulate the heat transfer fluid potentially in both circuits.

[0040] The radiator 430 is arranged to cool the heat transfer fluid of the two circuits (this radiator 430 is sized for cooling the volume of water in the total heat transfer circuit).

[0041] The OBCDC 150 converter (also called IDCM) measures its internal temperature and communicates it to the supervisor 500.

[0042] Each electrical machine, front 101, rear 102, measures its internal temperature and communicates it to the supervisor 500.

[0043] The supervisor 500 receives the temperatures of the OBCDC converter 150 and of the two electrical machines, front 101, and rear 102, and controls the rotation mode of the circulation pump 410 (thus controlling the flow at the outlet of the circulation pump 410), and controls the opening and closing of the three valves of the three-way solenoid valve 420.

[0044] The three-way solenoid valve 420 is controlled by the supervisor 500 to direct the heat transfer fluid: - either to the first electrical machine 101 before alone, when the OBCDC converter 150 and / or the first electrical machine 101 before exceeds a first temperature threshold calibrated in the supervisor 500; - either towards the second rear electric machine 102 alone, when the second rear electric machine 102 exceeds a second temperature threshold calibrated in the supervisor 500; - either towards the two electric machines, first electric machine 101 and second electric machine 102, in the case where the temperature of the second rear electric machine 102 exceeds its second calibrated threshold, and where the temperature of the OBCDC converter 150 and / or the first front electric machine 101 exceeds respectively the third temperature limit threshold or the first calibrated threshold; - either to prevent any circulation of heat transfer fluid.

[0045] For the remainder of this description, the three-way solenoid valve 420 is considered to be able to assume the following states, designated as follows: - blocking state: the 420 three-way solenoid valve prevents any passage of the heat fluid to any heat circuit; - first state: the three-way solenoid valve 420 directs the heat transfer fluid to the first electrical machine 101 forward, when the OBCDC converter 150 and / or the first electrical machine 101 forward exceeds respectively its third calibrated threshold or its first calibrated temperature threshold in the supervisor 500; - second state: the three-way solenoid valve 420 directs the heat transfer fluid to the second rear electric machine 102, when the second rear electric machine 102 exceeds its second temperature threshold calibrated in the supervisor 500; - third state: the three-way solenoid valve 420 directs the heat transfer fluid towards the first front electric machine 101 and towards the second rear electric machine 102, when the temperature of the second rear electric machine 102 exceeds its second calibrated temperature threshold, and when the temperature of the OBCDC converter 150 and / or the first front electric machine 101 exceeds respectively its third calibrated threshold or its first calibrated threshold, or both at the same time.

[0046] In the prior art, when the cooling of electrical machines does not depend on the proper functioning of a solenoid valve, for example, when each cooling loop has its own specific water pump, there is no function to verify the proper functioning of the three-way solenoid valve. The aftermarket range is capable of directly powering the solenoid valves and listening for the significant click indicating the change of state of the two- and / or three-way solenoid valves.

[0047] The problem to be solved is related to the fact that the supervisor 500 sends state change instructions to the three-way solenoid valve 420, and currently has no certainty in return that the three-way solenoid valve 420 has actually carried out the state change in accordance with the instruction that this three-way solenoid valve 420 received from the supervisor 500.

[0048] And after-sales service has no other way to verify that the three-way solenoid valve 420 correctly complies with the state change instructions than to apply this protocol: directly power the solenoid valves and listen for the click indicating the state change of the two- and / or three-way solenoid valves, to verify that the solenoid valves are not stuck in a position. Failure to carefully apply this protocol risks unnecessary replacement of the solenoid valves or water pumps, or even temperature sensors or electric traction machines, which represents a significant cost.

[0049] The invention also proposes a particular function to help diagnose a malfunction of the three-way solenoid valve of the heat transfer circuit of electric traction machines.

[0050] The invention consists of monitoring the temperature information returned by the temperature sensors of the heat transfer circuit of the front and / or rear electric machines 101 and / or 102, or by the temperature sensor of the OBCDC converter 150 (also called IDCM), when the three-way solenoid valve 420 is expected to have changed state; and, if the temperature information remains constant or continues to rise after a certain time, then the three-way solenoid valve 420 is deemed faulty by the supervisor 500. The supervisor 500 then initiates a reconfiguration to inform the operator and assist after-sales service in diagnosing the fault. The supervisor 500 is specifically configured to initiate two types of reconfigurations: a first reconfiguration and a second reconfiguration, which will be described later.

[0051] Monitoring the temperature gradient makes it possible to verify the proper functioning of the three-way solenoid valve 420 of the heat transfer circuit of the electric traction machines 101 and 102, and thus to protect users, and to help after-sales service in diagnosing the failure of the three-way solenoid valve 420. This new diagnostic strategy of the relevance of the information returned by the temperature sensors, and by means of the temperature gradient, thus makes it possible to effectively verify the proper functioning of the three-way solenoid valve 420 of the heat transfer circuit of the electric traction machines, and to avoid undertaking unnecessary and costly work.

[0052] More particularly, the invention consists of storing the information of the temperatures measured and returned by the OBCDC converter 150 and the two electric traction machines 101 and 102, of the heat transfer circuit, just before the supervisor 500 commands a change of state to the three-way solenoid valve 420.

[0053] Once the three temperatures have been memorized, the supervisor 500 sends the state change command to the three-way solenoid valve 420. Then after a duration Dl, the supervisor 500 retrieves the new temperature information from the three components concerned (first electric machine 101 front, second electric machine 102 rear, and OBCDC converter 150), and the supervisor 500 compares the temperature difference of the first temperature information with the second temperature information returned by the three components.

[0054] And if some of these new temperatures at the end of the time interval Δl are not lower than the initial temperatures, the supervisor 500 infers a malfunction of the three-way solenoid valve 420 of the heat transfer circuit. The supervisor 500 then initiates a reconfiguration.

[0055] More particularly, in a non-limiting embodiment of the invention, the supervisor 500 receives at regular time intervals, the duration of which is calibrable (in particular on the order of every 20 to 100 milliseconds), the temperature information from the three components: first electric machine 101 front, second electric machine 102 rear, and OBCDC converter 150, which will be referred to hereafter, for simplicity, as the three monitored components.

[0056] From a first temperature threshold for the first electrical machine 101 upstream, a calibrable threshold called STMELAV, the supervisor 500 orders the three-way solenoid valve 420 to change state: to switch to the first state if the three-way solenoid valve 420 is in the blocking state, or to switch to the third state if the three-way solenoid valve 420 is already in the second state.

[0057] From a second temperature threshold for the second rear electric machine 102, a calibrable threshold called STMELAR, the supervisor 500 orders the three-way solenoid valve 420 to change state: to switch to the second state if the three-way solenoid valve 420 is in the blocking state, or to switch to the third state if the three-way solenoid valve 420 is already in the first state.

[0058] From a third temperature threshold for the OBCDC converter 150, a calibrable threshold called STOBCDC, the supervisor 500 orders the three-way solenoid valve 420 to change state: to switch to the first state if the three-way solenoid valve 420 is in the blocking state, or to switch to the third state, if the three-way solenoid valve 420 is already in the second state.

[0059] For information, each initial state and each new state of the three-way solenoid valve 420 is stored in the supervisor 500, so the supervisor 500 knows from which state the three-way solenoid valve 420 is supposed to have started, and in which state the three-way solenoid valve 420 is supposed to have arrived. This information is stored in labels "InitialState" and "FinalState".

[0060] But the supervisor 500, just before sending a state change command to the three-way solenoid valve 420, stores the temperature information returned by each of the three monitored components, in variables TinitMELAV (for the temperature returned by the first electric machine 101 forward), TinitMELAR (for the temperature returned by the second electric machine 102 rear) and TinitOBCDC (for the temperature returned by the OBCDC converter 150).

[0061] Since this event takes place just before a change of state of the three-way solenoid valve 420, this means that one of the three temperatures TinitMELAV, TinitMELAR, TinitOBCDC, is necessarily equal to one of the three thresholds, so we have: either TinitMELAV = STMELAV, or TinitMELAR = STMELAR, or TinitOBCDC = STOBCDC.

[0062] Therefore, once the three temperature values ​​have been stored by the supervisor 500, the Supervisor 500 sends the state change command to the three-way solenoid valve 420. Therefore, the three-way solenoid valve 420 is supposed to go to its first state, second state, or third state, depending on the temperature threshold that is exceeded.

[0063] Then after a first duration DI following the sending of the state change command addressed to the three-way solenoid valve 420, the supervisor 500 again stores the temperature information returned by the three monitored components in the variables T1MELAV (for the temperature returned by the first electric machine 101 forward), T1MELAR (for the temperature returned by the second electric machine 102 rear) and T1OBCDC (for the temperature returned by the OBCDC converter 150).

[0064] Advantageously, the first DI duration is calibrable during the development phase of this new function. And the first DI duration is specifically between 500 milliseconds and 2 seconds.

[0065] Then the supervisor 500 calculates the temperature difference between the two measurements of each organ as follows.

[0066] A first temperature difference ETMELAV is calculated for the temperature difference on the first electrical machine 101 before over the duration Dl, therefore ETMELAV = T1MELAV - TinitMELAV.

[0067] A second temperature deviation ETMELAR is calculated for the temperature deviation on the second rear electrical machine 102 over the duration Dl, therefore ETMELAR = T1MELAR - TinitMELAR.

[0068] A third temperature difference ETOBCDC is calculated for the temperature difference on the OBCDC 150 converter over the time Dl, therefore ETOBCDC = TlOBCDC - Ti-nitOBCDC.

[0069] The following situations result from this.

[0070] If the supervisor 500 has moved the three-way solenoid valve 420 from the initial blocking state to the final first state because of reaching the STMELAV threshold, the supervisor 500 must see that ETMELAV falls below the deviation threshold Seuil-lEcMELAV; otherwise the supervisor 500 initiates a first reconfiguration.

[0071] If the supervisor 500 has moved the three-way solenoid valve 420 from the initial blocking state to the final first state because of reaching the STOBCDC threshold, the supervisor 500 must see that ETOBCDC falls below the deviation threshold Seuil-lEcOBCDC; otherwise the supervisor 500 initiates the first reconfiguration.

[0072] If the supervisor 500 has moved the three-way solenoid valve 420 from the initial blocking state to the final second state, the supervisor 500 must see that ETMELAR falls below the deviation threshold SeuilEcMELAR; otherwise, the supervisor 500 engages in a second reconfiguration.

[0073] If the supervisor 500 has switched the three-way solenoid valve 420 from the initial state state to the final state third state, supervisor 500 must see that ETMELAR falls below a threshold of deviation SeuilEcMELARbis; otherwise supervisor 500 engages the second reconfiguration.

[0074] If the supervisor 500 has moved the three-way solenoid valve 420 from the initial state second state to the final state third state because of the STMELAV threshold being reached, the supervisor 500 must note that ETMELAV falls below a threshold difference SeuilEc-MELAVbis; otherwise the supervisor 500 initiates the first reconfiguration.

[0075] If the supervisor 500 has moved the three-way solenoid valve 420 from the initial state (second state) to the final state (third state) because of reaching the STOBCDC threshold, the supervisor 500 must note that ETOBCDC falls below a deviation threshold SeuilE-cOBCDCbis; otherwise, the supervisor 500 initiates the first reconfiguration.

[0076] The deviation thresholds SeuilEcMELAV, SeuilEcOBCDC, SeuilEcMELAR, SeuilEc-MELAVbis, SeuilEcOBCDCbis, and SeuilEcMELARbis are calibrable thresholds during the development of this new function. These thresholds can all be different, but their order of magnitude is between -0.5°C and -5°C.

[0077] In theory, these temperature difference thresholds should be negative, because the change of state of the three-way solenoid valve 420 should lower the temperature of the components by means of the passage of the heat transfer fluid through these components.

[0078] Reconfiguration modes are managed as follows.

[0079] If after a time DI the supervisor 500 does not detect a drop in the temperature of the organ which led the supervisor 500 to request a change of state of the three-way solenoid valve 420, the supervisor 500 engages the first reconfiguration or the second reconfiguration as seen above.

[0080] The first reconfiguration involves the supervisor 500 storing a fault code (in the form POxxx-xl) so that the after-sales service can be informed of a failure of the three-way solenoid valve 420 on the branch of the first electric machine 101 upstream, and can, during servicing, inspect and / or replace the three-way solenoid valve 420 of the heat transfer circuit. The supervisor 500 then triggers a service indicator light on the dashboard to prompt the user to contact the after-sales service.

[0081] The second reconfiguration involves the supervisor 500 storing a fault code (of the form P0xxx-x2) so that the after-sales service can be informed of a failure of the three-way solenoid valve 420 on the branch of the second rear electric machine 102, and can, during servicing, inspect and / or replace the three-way solenoid valve 420 of the heat transfer circuit. The supervisor 500 then triggers a service indicator light on the instrument panel to prompt the user to contact the after-sales service.

[0082] This reconfiguration, once initiated, continues until the power is cut off. vehicle by the user.

[0083] When the vehicle's ignition is switched off and then switched back on, the fault is restored, i.e. the fault code remains stored in the read-only memory of the supervisor 500, but the fault code changes from the "permanent" state to the "transient" state on the next restart of the vehicle, on the other hand on the next detection of the fault, the state of the fault code will return to "permanent" until the next restart of the vehicle.

[0084] In summary, the invention monitors the temperature sensor readings of the front and / or rear electric traction machines, or the OBCDC temperature sensor, and, by means of the temperature gradient, verifies the proper functioning of the three-way solenoid valve in the heat transfer circuit of the electric traction machines. This protects users and assists after-sales services in diagnosing potential failures of the three-way solenoid valve. This prevents unnecessary replacement of costly components such as the water pump or the electric traction machines, or components requiring recalibration such as the temperature sensors.

[0085] The invention also makes it possible to contribute to the protection of users and to the protection of the integrity of the vehicle with regard to the risk of fire.

Claims

Claims

1. Motor vehicle (1000), electric or hybrid, comprising control means (900) themselves comprising a supervisor (500), said motor vehicle (1000) comprising at least one electric traction machine (100, 101, 102) powered by at least one OBCDC converter (150), a cooling circuit (200) arranged for the temperature regulation of said at least one electric traction machine (100, 101, 102), said supervisor (500) being arranged to carry out the monitoring of said cooling circuit (200) which comprises at least one heat transfer fluid circuit, the circulation of which is regulated by circulation management means (400) interfaced with said supervisor (500) to ensure optimal temperature regulation of each electric traction machine (100, 101, 102), which said motor vehicle (1000) comprises,said circulation management means (400) comprise at least one circulation pump (410) arranged to move said heat transfer fluid and at least one solenoid valve (420) arranged to authorize or prohibit the circulation of said heat transfer fluid in at least one part of said cooling circuit (200), characterized in that said supervisor (500) is arranged to monitor the correct operation of said at least one solenoid valve (420), and the response of said at least one solenoid valve (420) to the instructions emanating from said supervisor (500), by storing the temperatures measured periodically by said OBCDC converter (150) and by each said electric traction machine (100, 101, 102), and by monitoring the temperature evolution gradient in said cooling circuit (200), by comparing the measured temperatures,on the one hand in a first temperature information during a measurement interval directly preceding a state change command addressed by said supervisor (500) to said at least one solenoid valve (420), and on the other hand in a second temperature information during a measurement interval following said state change command, and for, if some of the temperatures of said second temperature information are not lower than the temperatures of said first temperature information, diagnosing a malfunction of said at least one solenoid valve (420).,

2. Motor vehicle (1000) according to claim 1 characterized in that

3.

4. that said supervisor (500) is arranged to initiate a reconfiguration of said cooling circuit (200), if some of the temperatures of said second temperature information are not lower than the temperatures of said first temperature information. Motor vehicle (1000) according to any one of claims 1 to 2 characterized in that said motor vehicle (1000) comprises at least a first electrical machine (101) and a second electrical machine (102), and in that said at least one solenoid valve (420) is a three-way solenoid valve controlled by said supervisor (500) and arranged to, depending on its position, direct the heat transfer fluid, either in a first state towards a first electrical machine (101) alone,when said first electrical machine (101) exceeds a first temperature threshold (STMELAV) calibrated in said supervisor (500) and / or when said OBCDC converter (150) exceeds a third temperature threshold (STOBCDC) calibrated in said supervisor (500), either in a second state towards a second electrical machine (102) alone, when said second electrical machine (102) exceeds a second temperature threshold (STMELAR) calibrated in said supervisor (500), or in a third state towards said first electrical machine (101) and said second electrical machine (102), in the case where the temperature of the second electrical machine (102) exceeds its said second temperature threshold (STMELAR), and where the temperature of said OBCDC converter (150) and / or of the first electrical machine (101) exceeds respectively said third temperature threshold (STOBCDC) or said first temperature threshold (STMELAV),either in a blocking state to prevent any circulation of said heat transfer fluid., Motor vehicle (1000) according to claim 3 characterized in that said supervisor (500) is arranged to receive, at regular time periods, and the duration of which is calibratable, the temperature information of three monitored members which are said first electric machine (101), said second electric machine (102), and said OBCDC converter (150), and in that said supervisor (500) is arranged to, from said first temperature threshold (STMELAV) for said first electric machine (101), order said three-way solenoid valve (420) to change state, to pass to said first state if said three-way solenoid valve (420) is in said blocking state, or to pass to said third state if said three-way solenoid valve

5. (420) is in said second state, and in that said supervisor (500) is arranged to, from said third temperature threshold (STOBCDC) for said OBCDC converter (150), order said three-way solenoid valve (420) to change state, to go to said first state if said three-way solenoid valve (420) is in said blocking state, or to go to said third state if said three-way solenoid valve (420) is already in said second state, and in that said supervisor (500) is arranged to, from said second temperature threshold (STMELAR) for said second electrical machine (102) order said three-way solenoid valve (420) to change state, to go to said second state if said three-way solenoid valve (420) is in said blocking state, or to go to said third state if said three-way solenoid valve (420) is in said first state. Motor vehicle (1000) according to claim 4 characterized in that said supervisor (500) is arranged to memorize each initial state and each new state of said three-way solenoid valve (420), respectively each initial state in an initial label “Etatinit” and each new state in a final label “Etatfinal”, and is further arranged to, just before sending a state change instruction to said three-way solenoid valve (420), memorize a first initial temperature information returned by each of said three monitored members, in a first variable (TinitMELAV) for a first initial temperature returned by said first electrical machine, a second variable (TinitMELAR) for a second initial temperature returned by said second electrical machine (102), and a third variable (TinitOBCDC) for a third initial temperature returned by said OBCDC converter (150),and in that said supervisor (500) is arranged to, once the three initial temperature values ​​have been stored, send a state change instruction to said three-way solenoid valve (420) to bring it to its first said state, or its second said state, or its third said state, depending on the temperature threshold which is exceeded, and in that said supervisor (500) is arranged to count down a first duration (Dl) after sending said state change instruction addressed to said three-way solenoid valve (420), and, at the end of said first duration (Dl), store new deferred temperature information, returned by each of said three monitored members in a first deferred variable (TlMELAV) for a first deferred temperature, temperature returned by said first electrical machine (101), a second delayed variable (T1MELAR) for a second delayed temperature returned by said second electrical machine (102), and a third delayed variable (T1OBCDC) for a third delayed temperature returned by said OBCDC converter (150), and in that said supervisor (500) is further arranged to calculate a temperature difference between the two measurements of each of said three monitored members, namely a first temperature difference (ETMELAV) for the temperature difference on said first electrical machine (101) over said first duration (Dl), a second temperature difference (ETMELAR) for the temperature difference on said second electrical machine (102) over said first duration (Dl), and a third temperature difference (ETOBCDC) for the temperature difference on said OBCDC converter (150) over said first duration (Dl), and for,in a first alternative if said supervisor (500) has caused said three-way solenoid valve (420) to pass from a said initial state (Etatinit) which is said blocking state to a said final state (Etatfinal) which is said first state due to the reaching of said first temperature threshold (STMELAV), in the event of finding by said supervisor (500) that said first temperature difference (ETMELAV) does not fall below a first calibratable difference threshold (SeuilEcMELAV), initiate a first reconfiguration, in a second alternative if said supervisor (500) has caused said three-way solenoid valve (420) to pass from a said initial state (Etatinit) which is said blocking state to a said final state (Etatfinal) which is said first state due to the reaching of said third temperature threshold (STOBCDC), in the event of finding by said supervisor (500) that said third temperature difference (ETOBCDC) does not fall below a third difference threshold (ThresholdEcOBCDC) calibratable,engage in said first reconfiguration, in a third alternative if said supervisor (500) has caused said three-way solenoid valve (420) to pass from a said initial state (Etatinit) which is said blocking state to a said final state (Etatfinal) which is said second state, in the event of observation by said supervisor (500) that said second temperature difference (ETMELAR) does not fall below a second calibratable difference threshold (SeuilEcMELAR), engage in a second reconfiguration, in a fourth alternative if said supervisor (500) has caused said three-way solenoid valve (420) to pass from a said initial state (Etatinit) which is said first state to a said final state (Etatfinal) which is said third state, and in the event of observation by said supervisor (500) that said, second temperature difference (ETMELAR) does not fall below a fourth calibratable difference threshold (SeuilEcMELARbis), initiate said second reconfiguration, in a fifth alternative if said supervisor (500) has caused said three-way solenoid valve (420) to pass from a said initial state (Etatinit) which is said second state to a said final state (Etatfinal) which is said third state, due to said first temperature threshold (STMELAV) being reached, and in the event of observation by said supervisor (500) that said first temperature difference (ETMELAV) does not fall below a fifth calibratable difference threshold (SeuilEcMELAVbis), initiate said first reconfiguration, in a sixth alternative if said supervisor (500) has caused said three-way solenoid valve (420) to pass from a said initial state (Etatinit) which is said second state to a said final state (Etatfinal) which is said third state, due to said third temperature threshold being reached (STOBCDC),and in the event that said supervisor (500) finds that said third temperature difference (ETOBCDC) does not fall below a sixth calibratable difference threshold (SeuilEcOBCDCbis), initiate said first reconfiguration.,

6. Motor vehicle (1000) according to claim 5 characterized in that said first deviation threshold (SeuilEcMELAV), said second deviation threshold (SeuilEcOBCDC), said third deviation threshold (SeuilEcMELAR), said fourth deviation threshold (SeuilEcMELAVbis), said fifth deviation threshold (SeuilEcOBCDCbis), and said sixth deviation threshold (SeuilEcMELARbis), are calibratable thresholds whose value is between -0.5°C and -5°C.

7. Motor vehicle (1000) according to claim 5 or 6 characterized in that said first duration (D) is between 500 milliseconds and 2 seconds.

8. Motor vehicle (1000) according to one of claims 5 to 7 characterized in that said first reconfiguration consists of the memorization of a first fault code by said supervisor (500) to inform the after-sales service of a failure of said three-way solenoid valve (420) on the branch of said first electrical machine (101), and in that said second reconfiguration consists of the memorization of a second fault code by said supervisor (500) to inform the after-sales service of a failure of said three-way solenoid valve (420) on the branch of said second electrical machine (102).

9. Motor vehicle (1000) according to one of claims 5 to 8 ca- characterized in that said supervisor (500) is arranged to, when launching a said first reconfiguration or second reconfiguration, immediately trigger the lighting of a service indicator light on the dashboard to encourage the user of said motor vehicle (1000) to go to the after-sales service.

10. Motor vehicle (1000) according to one of claims 5 to 9 characterized in that said supervisor (500) is arranged to maintain a said first reconfiguration or second reconfiguration, once launched, until the ignition of said motor vehicle (1000) is switched off by the user, and to restore a fault, by a fault code remaining stored in a read-only memory included in said supervisor (500), said fault code being arranged to change from a “permanent” state to a “transient” state at the next restart of said motor vehicle (1000), and, in the event of the next detection of the same fault, to maintain said fault code in said “permanent” state until the next restart of said motor vehicle (1000).

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