Electric or hybrid vehicle propulsion system

Abstract

The invention relates to a hybrid or electric vehicle propulsion system, comprising: - a primary propulsion subsystem comprising a primary axle (2) that can be connected to at least one primary wheel (10R, 10L) of the vehicle, and a propulsion source (14, 22); - a secondary propulsion subsystem comprising a secondary axle (1) that can be connected to at least one secondary wheel (3R, 3L) of the vehicle, a secondary rotary electrical machine (8) and a measurement system, as well as a member for selectively interrupting the torque transmission (6), having an open position and a closed position; the propulsion system also comprising a first control unit (32) configured such that, when an operating parameter of the secondary electrical assembly (43) exceeds a threshold while the member for selectively interrupting the torque transmission (6) is in the closed position, it controls the deceleration of the vehicle.

Description

[0001] Description

[0002] Title of the invention: Electric or hybrid vehicle propulsion system

[0003] The present invention relates to an electric or hybrid vehicle propulsion system.

[0004] As is known, such a propulsion system comprises:

[0005] - a secondary axle connected to secondary wheels of the vehicle,

[0006] - a rotating electric machine for secondary propulsion of the secondary wheels of the vehicle, and

[0007] - a reducer arranged in the torque path between the secondary rotating electrical machine and the secondary wheels of the vehicle.

[0008] It is known to interpose a selective torque transmission interruption member in the torque path such as a clutch or a dog clutch having an open position and a closed position. When the torque interruption member is in the closed position and it is not always possible to move the torque interruption member to the open position, the secondary propulsion rotating electrical machine may reach a rotational speed higher than its permissible speed. The secondary propulsion rotating electrical machine may be damaged or even destroyed.

[0009] It is known that the phases of the secondary rotating electrical machine can be short-circuited in certain fault situations. In these situations, and when the torque interrupter is in the closed position and it is not always possible to move the torque interrupter to the open position, an inverter supplying the secondary rotating electrical machine can be damaged or even destroyed by overheating.

[0010] There is a need to address the drawbacks just mentioned.

[0011] The invention aims to meet this need and achieves this, according to one of its aspects, using a hybrid or electric vehicle propulsion system, comprising:

[0012] - a primary propulsion subsystem comprising:

[0013] - a primary axle capable of being connected to at least one primary wheel of the vehicle, and

[0014] - a propulsion source for the at least one primary wheel, the propulsion source being a primary electrical assembly comprising a primary rotating electrical machine and / or a thermal machine,

[0015] - a secondary propulsion subsystem comprising:

[0016] - a secondary axle capable of being connected to at least one secondary wheel of the vehicle, a secondary electrical assembly for propelling the at least one secondary wheel of the vehicle, the secondary electrical assembly comprising a secondary rotating electrical machine and a measuring system,

[0017] - a second reducer arranged in the torque path between the secondary rotating electrical machine and at least one secondary wheel of the vehicle,

[0018] - a member for selectively interrupting the torque transmission in the torque path, the member for selectively interrupting the torque transmission having an open position and a closed position, the propulsion system also comprising a first control unit configured to, when an operating parameter of the secondary electrical assembly exceeds a threshold while the member for selectively interrupting the torque transmission is in the closed position:

[0019] - controlling the propulsion source of the at least one primary wheel and / or a braking system of the at least one primary wheel and / or of the at least one secondary wheel of the vehicle so as to control a deceleration of the vehicle.

[0020] Such a hybrid or electric vehicle propulsion system makes it possible to reduce the degradation of the components of the secondary propulsion subsystem in the event of the selective torque transmission interruption member becoming stuck in the closed position. Such a propulsion system also makes it possible to improve the safety level of the vehicle and can contribute to achieving a safety integrity level C (ASIL C or Automotive Safety Integrity Level C in English).

[0021] According to an additional characteristic of the invention, the measuring system is a first system for measuring the rotation speed of the secondary rotating electrical machine, the operating parameter of the secondary electrical assembly being the rotation speed of the secondary rotating electrical machine and the threshold being a maximum rotation speed of the secondary rotating electrical machine, the first system for measuring the rotation speed of the secondary rotating electrical machine comprising in particular an angular displacement sensor.

[0022] The use of such a system for measuring the rotational speed of the secondary rotating electrical machine and such a threshold makes it possible to limit the damage, or even the destruction of the secondary rotating electrical machine which could be caused by an overspeed of the secondary rotating electrical machine. Indeed, the deceleration of the vehicle makes it possible to reduce, with the selective torque transmission interruption member in the closed position, the occurrence of the vehicle driving an overspeed rotating electrical machine.According to an additional characteristic of the invention, the secondary electrical assembly comprises a first inverter / rectifier, the measurement system being a temperature measurement system and the operating parameter of the secondary electrical assembly being an evaluation of the temperature of the first inverter / rectifier, the evaluation of the temperature of the first inverter / rectifier being carried out by the temperature measurement system and the threshold being a maximum value of the temperature of the first inverter / rectifier.

[0023] The use of such a temperature measurement system and such a threshold makes it possible to reduce the risks of overheating or even destruction of the first inverter / rectifier.

[0024] According to an additional characteristic of the invention, the temperature measurement system comprises at least one temperature sensor, in particular:

[0025] - the secondary rotating electrical machine comprising a second stator, a temperature sensor of the second stator, and / or

[0026] - the first inverter / rectifier comprising at least one power electronic module comprising switches, a power electronic module temperature sensor, and / or

[0027] - the first inverter / rectifier comprising at least one bus bar, a bus bar temperature sensor, and / or

[0028] - the first inverter / rectifier comprising at least one heat sink, a heat sink temperature sensor, and / or

[0029] - an indoor air temperature sensor of the first inverter / rectifier.

[0030] According to an additional characteristic of the invention, the secondary electrical assembly comprises a first control module and the secondary rotating electrical machine comprises a second stator comprising phases, the first control module causing the short-circuiting of at least one of the phases of the second stator in the event of failure of the secondary rotating electrical machine.

[0031] Short-circuiting at least one of the phases of the second stator allows the secondary rotating electrical machine to be made safe in the event of a failure. Decelerating the vehicle limits the heating of the first inverter / rectifier when the rotating electrical machine is short-circuited.

[0032] According to an additional feature of the invention, the first control unit is configured to decelerate the vehicle to a refuge speed, in particular a refuge speed of between 50 and 80 km / h.

[0033] According to an additional characteristic of the invention, the measurement system is integrated into the secondary propulsion subsystem, the first control module controlling the first inverter / rectifier supplying the secondary rotating electrical machine, the measurement system being in particular integrated into the first control module, the first control module being external to the primary propulsion subsystem.

[0034] According to an additional characteristic of the invention, the member for selectively interrupting the torque transmission is arranged at the upstream input of the second reducer, or downstream of the second reducer, or in the second reducer, then selectively connecting two shafts of this second reducer.

[0035] According to an additional characteristic of the invention, the propulsion system comprises a second position sensor intended to detect the open position and the closed position of the member for selectively interrupting the torque transmission.

[0036] The second reducer mentioned above may or may not constitute a gearbox, which can allow several ratios to be obtained.

[0037] According to an additional characteristic of the invention, the member for selectively interrupting the torque transmission is a dog clutch or a clutch. It is preferably a dog clutch.

[0038] The first control unit may include:

[0039] - a first control module configured to detect the failure of the secondary rotating electrical machine and, if necessary, to control the transition to the open position of the selective torque transmission interruption member, and

[0040] - a second control module configured to control the propulsion source of the primary wheels and / or the braking system of the primary wheels and / or the secondary wheels of the vehicle so as to control a deceleration of the vehicle.

[0041] The first control module can also, after detecting the failure of the secondary rotating electrical machine, command the latter to switch to a safety configuration, this configuration involving, for example, the short-circuiting of at least one of the phases of the second stator, as already mentioned.

[0042] As already mentioned, the control of the transition to the open position of the selective torque transmission interruption member is carried out, for example, by the first control module or by the second control module. Each of these first and second control modules can, depending on the configuration, carry out this control.

[0043] The first control module is for example integrated into the secondary propulsion subsystem, being in particular a control module of the first inverter / rectifier supplying the secondary rotating electrical machine, and the second control module may be external to the primary propulsion subsystem and to the secondary propulsion subsystem. The first control module may alternatively be integrated into the actuator of the selective torque transmission interruption member, this actuator in particular allowing the transition from the open position to the closed position of the selective torque transmission interruption member.

[0044] The second control module is, for example, integrated into the vehicle's transmission control unit ("TCU") or engine control unit ("ECU") or another separate control unit, for example a vehicle control unit, called (Vehicle Control Unit, VCU).

[0045] Each of the first and second control modules implements, for example, one or more digital processing devices, such as microcontrollers. Each control module is, for example, an ASIC (Application-specific integrated circuit) type integrated circuit.

[0046] In all of the above, the member for selectively interrupting the torque transmission may be arranged upstream of the second reducer, or downstream of the second reducer, or in the second reducer, then selectively connecting two shafts of this second reducer. "Upstream" and "downstream" must be understood in relation to the torque path generated by the secondary rotating electrical machine.

[0047] The secondary axle can be the front axle or the rear axle of the vehicle.

[0048] The secondary rotating electrical machine may have a nominal electrical power greater than or equal to 5 kW, 15 kW, 25 kW, 50 kW, 100 kW or 300 kW.

[0049] The secondary rotating electrical machine can be a synchronous machine or an asynchronous machine. The electrical machine has, for example, a nominal supply voltage of 48V, or a nominal supply voltage greater than 200V, especially 300V, especially 400V, especially 800V.

[0050] The second rotor may be made of permanent magnets. For example, the second rotor may not have an electrical excitation winding. The second rotor may be formed by a stack of laminations inside which the permanent magnets are arranged.

[0051] Alternatively, the second rotor may have an electrical excitation winding.

[0052] The propulsion source of the primary subsystem is for example a rotating electrical machine which may be of the same type as that of the secondary subsystem, or differ from it for example by its nominal electrical power, the presence of permanent excitation at the first rotor, or the way in which this permanent excitation is achieved, for example with an electrical excitation winding while the excitation of the second rotor of the secondary rotating electrical machine is achieved using permanent magnets, or vice versa.

[0053] Alternatively, the propulsion source of the primary subsystem is a thermal machine. Alternatively, the propulsion source of the primary subsystem is hybrid, with a thermal machine and a primary rotating electrical machine then being present.

[0054] The secondary rotating electrical machine is, for example, a permanent magnet synchronous machine and the primary rotating electrical machine is, for example, a rotor synchronous machine having an electrical excitation winding.

[0055] The invention also relates, according to another of its aspects, to a method for controlling a hybrid or electric vehicle propulsion system, comprising:

[0056] - a primary propulsion subsystem comprising: a primary axle capable of being connected to at least one primary wheel of the vehicle, and a propulsion source for the at least one primary wheel, this propulsion source being a primary rotating electrical machine and / or a thermal machine,

[0057] - a secondary propulsion subsystem comprising: a secondary axle capable of being connected to at least one secondary wheel of the vehicle, a secondary electrical assembly for propelling the at least one secondary wheel of the vehicle, the secondary electrical propulsion assembly comprising a secondary rotating electrical machine and a measuring system, the secondary propulsion subsystem further comprising a second reducer arranged in the torque path between the secondary rotating electrical machine and the at least one secondary wheel of the vehicle, a member for selectively interrupting the torque transmission in the torque path, the member for selectively interrupting the torque transmission having an open position and a closed position, method comprising:

[0058] - a measurement step in which an operating parameter of the secondary electrical assembly is measured with the measurement system while the selective torque transmission interruption member is in the closed position,

[0059] - a comparison step in which the measurement of the operating parameter of the secondary electrical assembly is compared with a threshold, and

[0060] - a deceleration step in which, if the measurement of the operating parameter is greater than the threshold, the propulsion source of the at least one primary wheel and / or a braking system of the at least one primary wheel and / or of the at least one secondary wheel of the vehicle is controlled so as to control a deceleration of the vehicle.

[0061] According to an additional characteristic of the invention, the method for controlling a hybrid or electric vehicle propulsion system further comprises:

[0062] - a step of controlling the opening of the selective torque transmission interruption member in which the passage to the open position of the selective torque transmission interruption member is controlled, - a step of detecting the position of the selective torque transmission interruption member in which the position of the selective torque transmission interruption member is detected,

[0063] - a step of interrupting the deceleration if the selective torque transmission interruption member is detected open during the step of detecting the position of the selective torque transmission interruption member.

[0064] According to an additional characteristic of the invention, the measuring system is a system for measuring the rotation speed of the secondary electrical machine, the operating parameter of the secondary electrical assembly is the rotation speed of the secondary rotating electrical machine and the threshold is a maximum rotation speed of the secondary rotating electrical machine.

[0065] According to an additional characteristic of the invention:

[0066] - the secondary electrical assembly includes a first inverter / rectifier,

[0067] - the measuring system is a temperature measuring system,

[0068] - the operating parameter of the secondary electrical assembly is an evaluation of the temperature of the first inverter / rectifier, the evaluation of the temperature of the first inverter / rectifier being carried out by the temperature measurement system, and

[0069] - the threshold is a maximum value of the temperature of the first inverter / rectifier.

[0070] All or part of the above still applies to the method, in particular the fact that the control is carried out by a control unit as mentioned above.

[0071] The invention may be better understood by reading the following description of non-limiting examples and by examining the attached drawing in which:

[0072] - figure 1 schematically represents a hybrid vehicle propulsion system in which the invention can be implemented,

[0073] - figure 2 represents a block diagram of a method according to the invention.

[0074] Ordinal numeral adjectives are used to differentiate characteristics. They do not define the position of a characteristic. Therefore, for example, a third characteristic of a product does not mean that the product has a first and / or second characteristic.

[0075] Figure 1 shows a propulsion system in which the invention can be implemented. This system can belong to an electric or hybrid vehicle. In the example considered, but in a non-limiting manner, the propulsion system is hybrid, as will be seen later.

[0076] This propulsion system here has a primary subsystem which will be described. This primary subsystem comprises a primary axle 2, which is for example the front axle. This primary axle 2 is here associated via a part 1 IR with a primary right wheel 10R and via a part 1 IL with a primary left wheel 10L. This primary axle 2 is here associated with a differential 12 and a first reducer 13. This first reducer 13 can constitute a gearbox, defining several ratios.

[0077] In another embodiment not shown, the primary axle is associated with a single primary wheel. In this embodiment the primary subsystem does not include a differential.

[0078] In the example considered, this primary subsystem is hybrid in that it receives torque from a primary rotating electrical machine 14, the latter being able to be powered through a second inverter / rectifier 15 by a battery 16 which in the example considered has a nominal voltage greater than 300V, for example 400V or 800V, but which could alternatively have a lower nominal voltage, for example 48V. This battery 16 is for example supervised by a BMS 17 type system (“battery management system” in English). A first angular displacement sensor 27 for the first rotor of the primary rotating electrical machine 14 is provided here. The primary rotating electrical machine 14 is for example a synchronous machine with a rotor with an electrical excitation winding.

[0079] The primary rotating electrical machine comprises, for example, a first stator and a first rotor.

[0080] This primary subsystem is also hybrid in that it receives torque from a thermal machine 22, if necessary via a torsional oscillation damper 21 using springs and / or a pendulum damping device, for example. A fourth speed sensor 23 is for example associated with the thermal machine 22. A ninth speed sensor 28R and a tenth speed sensor 28L may also be associated with the primary wheels 10R and 10L.

[0081] The primary subsystem thus presents in the example considered a source of propulsion of the primary wheels 10R and 10L formed by the union of the primary rotating electric machine 14 and the thermal machine 22.

[0082] In examples not shown, the primary subsystem is purely electrical or purely thermal.

[0083] The propulsion system also comprises a secondary propulsion subsystem. The secondary subsystem is for example here arranged on the rear side of the vehicle. In this example, it comprises the rear axle 1 of the vehicle, this rear axle 1 being called the “secondary axle”. The secondary propulsion subsystem also comprises a secondary electrical assembly 43 for propelling at least one secondary wheel 3R, 3L of the vehicle. The secondary electrical assembly 43 comprises a secondary rotating electrical machine 8 and a measuring system. For example, the secondary axle 1 is associated via a first part 4R with a secondary right wheel 3R and via a second part 4L with a secondary left wheel 3L. This secondary axle 1 is here associated with a differential 5 and a second reduction gear 7.This second reducer 7 receives torque from a secondary rotating electrical machine 8 powered via a first inverter / rectifier 9 from the already mentioned battery 16. In a variant, two different batteries may be present, one being dedicated to the electrical supply of the secondary rotating electrical machine 8 via the first inverter / rectifier 9, the other being dedicated to the electrical supply of the primary rotating electrical machine 14 via the second inverter / rectifier 15. The secondary rotating electrical machine 8 is for example a permanent magnet synchronous machine.

[0084] The secondary rotating electrical machine comprises, for example, a second stator and a second rotor.

[0085] In another embodiment of the invention not shown, the secondary subsystem is at the front of the vehicle and the primary subsystem is at the rear of the vehicle.

[0086] In another embodiment of the invention not shown, the vehicle comprises a first secondary subsystem and a second secondary subsystem. The first secondary subsystem is associated via a first part with a secondary right wheel. The second secondary subsystem is associated via a second part with a secondary left wheel.

[0087] In another embodiment not shown, the secondary axle is associated with a single secondary wheel. In this embodiment the secondary subsystem does not include a differential. The vehicle is for example a two-wheeled vehicle in which the primary subsystem is associated with a single wheel or a three-wheeled vehicle in which the primary subsystem is associated with two wheels.

[0088] It can be seen in Figure 1 that the on-board network of the vehicle comprises a high voltage part 20, by which the battery 16 is in the example considered connected to the first inverter / rectifier 9 and to the inverter / rectifier 15 and a low voltage part 19 connected to the high voltage part 20 by means of a DC / DC converter 18. This low voltage part 19 here comprises a battery 44 which has for example a nominal voltage of 12 V.

[0089] Similar to the first angular displacement sensor 27, the fourth speed sensor 23, the ninth speed sensor 28R and the tenth speed sensor 28L, the secondary axle 1 can be associated with a third angular displacement sensor 26 for the second rotor of the secondary rotating electrical machine 8 and with an eleventh speed sensor 24R and a twelfth speed sensor 24L for the wheels 3R ​​and 3L. A fifth speed sensor 25 can also be provided on the output of the second reducer 7 on the differential 5 side.

[0090] In a known manner, the vehicle also comprises all or part of the various members 42 below, such as a user interface for starting the vehicle 33, such as a button, a handbrake 34, an accelerator pedal 35 and its associated sixth sensor 36, a steering wheel 37, a brake pedal 39 and its associated seventh sensor 38, and a gear lever 40 and its associated eighth sensor 41.

[0091] The vehicle comprises a first vehicle control unit 32, also called a VCU (vehicle control unit). The first control unit 32 manages, for example, the torque request from the driver and distributes it between propulsion sources, for example between the secondary rotating electrical machine 8 of the secondary propulsion subsystem and the primary rotating electrical machine 14 and the thermal machine 22 of the primary propulsion subsystem. It can also manage the use of the energy available in the propulsion system due to the recuperation operation or when the battery 16 is being charged by the thermal engine 22.

[0092] The vehicle may also include:

[0093] - an engine control unit 29, for controlling the thermal machine 22,

[0094] - a third brake control unit 30,

[0095] - a fourth transmission control unit 31, controlling in particular the first reducer 13 of the primary axle 2.

[0096] According to the invention, a member for selectively interrupting the torque transmission 6 is present. This member for selectively interrupting the torque transmission 6 is here arranged at the output of the second reducer 7, but the invention is not limited to such a location. This member for selectively interrupting the torque transmission 6 may alternatively be arranged at the input of the second reducer 7, or inside the second reducer 7, then selectively connecting two shafts of this second reducer 7.

[0097] This selective torque transmission interruption member 6 has an open position in which it interrupts the torque transmission to the secondary wheels 3R ​​and 3L, and a closed position in which this torque transmission to the secondary wheels 3R ​​and 3L is effective. The modification of the position of this selective torque transmission interruption member 6 is caused at least in one direction by an actuator. The transition from the closed position to the open position is carried out for example via the actuator.

[0098] The selective torque transmission interruption member 6 is for example a clutch or a dog clutch. Preferably, it is a selective torque transmission interruption member implementing an obstacle transmission, for example via a spline or a toothing, such as a dog clutch.

[0099] A second position sensor 47 may be intended to detect the open position and the closed position of the selective torque transmission interruption member.

[0100] The first control unit 32 is configured to, when an operating parameter of the secondary electrical assembly 43 exceeds a threshold while the selective torque transmission interruption member 6 is in the closed position, control the propulsion source, for example the rotating electrical machine 14 and / or the thermal machine 22, of the at least one primary wheel 10R, 10L and / or a braking system of the at least one primary wheel 10R, 10L and / or of the at least one secondary wheel 3R, 3L of the vehicle so as to control a deceleration of the vehicle.

[0101] The first control unit may include:

[0102] - a first control module 46 configured to detect the failure of the secondary rotating electrical machine 8 and, if necessary, to control the transition to the open position of the selective torque transmission interruption member 6, and

[0103] - a second control module configured to control the propulsion source of the primary wheels 10R and 10L, for example the rotating electrical machine 14 and / or the thermal machine 22, and / or the braking system of the primary wheels and / or the secondary wheels of the vehicle so as to control a deceleration of the vehicle.

[0104] The first control module 46 can also, after having detected the failure of the secondary rotating electrical machine 8, command the latter to switch to a safety configuration, this configuration involving, for example, the short-circuiting of at least one of the phases of the second stator.

[0105] The first control module 46 is, for example, the control module of the first inverter / rectifier 9, and the second control module is the vehicle control unit 32 (VCU). Other embodiments are possible.

[0106] The measuring system is for example a first system for measuring the rotation speed of the secondary rotating electrical machine 8, the operating parameter of the secondary electrical assembly 43 being the rotation speed of the secondary rotating electrical machine 8. The threshold is for example a maximum rotation speed of the secondary rotating electrical machine 8. The first system for measuring the rotation speed of the secondary rotating electrical machine 8 may comprise a third angular displacement sensor 26.

[0107] In another embodiment not shown, the first system for measuring the rotational speed of the secondary rotating electrical machine 8 comprises a resolver.

[0108] When the rotational speed of the secondary rotating electrical machine 8 exceeds the threshold, the first control unit 32 can be configured to decelerate the vehicle to a refuge speed, in particular a refuge speed of between 50 and 80 km / h. For example, the first control unit 32 is configured to decelerate the vehicle to a refuge speed of 70 km / h. For example, the refuge speed is predetermined as a function of the maximum operating speed for which the secondary rotating electrical machine 8 was designed.

[0109] The measuring system may also be a temperature measuring system and the operating parameter of the secondary electrical assembly 8 being an evaluation of the temperature of the first inverter / rectifier 9. The evaluation of the temperature of the first inverter / rectifier 9 being carried out by the temperature measuring system. The threshold is a maximum value of the temperature of the first inverter / rectifier 9.

[0110] The temperature measuring system comprises at least one temperature sensor 45. The temperature sensor 45 is, for example, a temperature sensor of the second stator.

[0111] The first inverter / rectifier 9 may comprise at least one power electronic module comprising switches. The temperature sensor 45 may be a power electronic module temperature sensor.

[0112] The first inverter / rectifier 9 may comprise at least one bus bar. The temperature sensor may be a bus bar temperature sensor.

[0113] The first inverter / rectifier 9 may comprise at least one heat sink. The temperature sensor may be a heat sink temperature sensor.

[0114] The temperature sensor may also be an indoor air temperature sensor of the first inverter / rectifier 9.

[0115] In one embodiment of the invention, the temperature measurement system comprises several sensors among the temperature sensor of the second stator, the temperature sensor of the power electronic module, the busbar temperature sensor, the heat sink temperature sensor, the interior air temperature sensor of the first inverter / rectifier 9. The evaluation of the temperature of the first inverter / rectifier 9 is calculated from the measurements made by the different sensors of the temperature measurement system. For example, the calculation of the evaluation of the temperature of the first inverter / rectifier 9 is carried out by the first control module 46.

[0116] When the evaluation of the temperature of the first inverter / rectifier 9 exceeds the threshold, the first control unit 32 can be configured to decelerate the vehicle to a refuge speed, in particular a refuge speed of between 50 and 80 km / h. For example, the first control unit 32 is configured to decelerate the vehicle to a refuge speed of 70 km / h. For example, the refuge speed is predetermined as a function of the temperature resistance of the components constituting the secondary electrical assembly, in particular as a function of the temperature resistance of the electronic components of the first inverter / rectifier 9.

[0117] The measuring system can be integrated into the first control module 46 controlling the first inverter / rectifier 9. The first control module 46 is for example external to the primary propulsion subsystem.

[0118] Figure 2 represents a block diagram of a control method 200 of a primary propulsion system as described previously.

[0119] The ordering process includes:

[0120] - a first step 100 of detecting the position of the selective torque transmission interruption member 6 in which the position of the selective torque transmission interruption member is detected,

[0121] - a measuring step 101 in which an operating parameter of the secondary electrical assembly 43 is measured with the measuring system while the selective torque transmission interruption member 6 is in the closed position,

[0122] - a comparison step 102 in which the measurement of the operating parameter of the secondary electrical assembly 43 is compared with a threshold, and

[0123] - a deceleration step 103 in which, if the measurement of the operating parameter is greater than the threshold, the propulsion source 14, 22 of the at least one primary wheel 10R, 10L and / or a braking system of the at least one primary wheel 10R, 10L and / or of the at least one secondary wheel 3R, 3L of the vehicle is controlled so as to control a deceleration of the vehicle.

[0124] The method for controlling a hybrid or electric vehicle propulsion system may further comprise:

[0125] - a step 104 of controlling the opening of the selective torque transmission interruption member 6 in which the passage to the open position of the selective torque transmission interruption member 6 is controlled, - a second step 105 of detecting the position of the selective torque transmission interruption member 6 in which the position of the selective torque transmission interruption member is detected,

[0126] - a step of interrupting the deceleration 106 if the selective interruption member of the torque transmission 6 is detected open during the step of detecting the position of the selective interruption member of the torque transmission 6.

[0127] The first detection step 100 and the second detection step 106 can be combined and carried out continuously or with a predetermined frequency, for example at a frequency of less than 1 Hz.

Claims

Claims 1. Hybrid or electric vehicle propulsion system, comprising: - a primary propulsion subsystem comprising: - a primary axle (2) capable of being connected to at least one primary wheel (10R, 10L) of the vehicle, and - a propulsion source (14, 22) of the at least one primary wheel (10R, 10L), the propulsion source (14, 22) being a primary electrical assembly comprising a primary rotating electrical machine (14) and / or a thermal machine (22), - a secondary propulsion subsystem comprising: - a secondary axle (1) capable of being connected to at least one secondary wheel (3R, 3L) of the vehicle, a secondary electrical assembly (43) for propelling the at least one secondary wheel (3R, 3L) of the vehicle, the secondary electrical assembly (43) comprising a secondary rotating electrical machine (8) and a measuring system, - a second reducer (7) arranged in the torque path between the secondary rotating electrical machine (8) and the at least one secondary wheel (3R, 3L) of the vehicle, - a member for selectively interrupting the torque transmission (6) in the torque path, the member for selectively interrupting the torque transmission (6) having an open position and a closed position, the propulsion system also comprising a first control unit (32) configured to, when an operating parameter of the secondary electrical assembly (43) exceeds a threshold while the member for selectively interrupting the torque transmission (6) is in the closed position: - controlling the propulsion source (14, 22) of the at least one primary wheel (10R, 10L) and / or a braking system of the at least one primary wheel (10R, 10L) and / or of the at least one secondary wheel (3R, 3L) of the vehicle so as to control a deceleration of the vehicle.

2. Hybrid or electric vehicle propulsion system according to the preceding claim, in which the measuring system is a first system for measuring the rotational speed of the secondary rotating electrical machine (8), the operating parameter of the secondary electrical assembly (43) being the rotational speed of the secondary rotating electrical machine (8) and the threshold being a maximum rotational speed of the secondary rotating electrical machine (8), the first system for measuring the rotational speed of the secondary rotating electrical machine (8) comprising in particular a third angular displacement sensor (26).

3. Hybrid or electric vehicle propulsion system according to claim 1 wherein the secondary electrical assembly (43) comprises a first inverter / rectifier (9), the measurement system being a temperature measurement system and the operating parameter of the secondary electrical assembly (8) being an evaluation of the temperature of the first inverter / rectifier (9), the evaluation of the temperature of the first inverter / rectifier (9) being carried out by the temperature measurement system and the threshold being a maximum value of the temperature of the first inverter / rectifier (9).

4. Hybrid or electric vehicle propulsion system according to the preceding claim wherein the temperature measurement system (45) comprises at least one temperature sensor (45), in particular: a. the secondary rotating electrical machine (8) comprising a second stator, a stator temperature sensor, and / or b. the first inverter / rectifier (9) comprising at least one power electronic module comprising switches, a power electronic module temperature sensor, and / or c. the first inverter / rectifier (9) comprising at least one bus bar, a bus bar temperature sensor, and / or d. the first inverter / rectifier (9) comprising at least one heat sink, a heat sink temperature sensor, and / or e. an interior air temperature sensor of the first inverter / rectifier (9).

5. Hybrid or electric vehicle propulsion system according to one of claims 3 to 4 wherein the secondary electrical assembly (43) comprises a first control module (46) and the secondary rotating electrical machine (8) comprises a second stator comprising phases, the first control module (46) causing the short-circuiting of at least one of the phases of the second stator in the event of failure of the secondary rotating electrical machine (8).

6. Hybrid or electric vehicle propulsion system according to one of the preceding claims, in which the first control unit (32) is configured to decelerate the vehicle to a refuge speed, in particular a refuge speed of between 50 and 80 km / h.

7. Hybrid or electric vehicle propulsion system according to one of claims 5 to 6 taken in combination with claim 5, in which the measurement system is integrated into the secondary propulsion subsystem, the first control module (46) controlling the first inverter / rectifier (9) supplying the secondary rotating electrical machine (8), the measurement system being in particular integrated into the first control module (46), and wherein the first control module (46) is external to the primary propulsion subsystem.

8. Hybrid or electric vehicle propulsion system according to any one of the preceding claims, in which the member for selectively interrupting the torque transmission (6) is arranged at the upstream input of the second reducer (7), or downstream of the second reducer (7), or in the second reducer (7), then selectively connecting two shafts of this second reducer.

9. Method for controlling a hybrid or electric vehicle propulsion system, comprising: - a primary propulsion subsystem comprising: a primary axle (2) capable of being connected to at least one primary wheel (10R, 10L) of the vehicle, and a propulsion source (14, 22) of the at least one primary wheel (10R, 10L), this propulsion source being a primary rotating electrical machine (14) and / or a thermal machine (22), - a secondary propulsion subsystem comprising: a secondary axle (1) capable of being connected to at least one secondary wheel (3R, 3L) of the vehicle, a secondary electrical propulsion assembly (43) of the at least one secondary wheel (3R, 3L) of the vehicle, the secondary electrical propulsion assembly (43) comprising a secondary rotating electrical machine (8) and a measuring system, the secondary propulsion subsystem further comprising a second reducer (7) arranged in the torque path between the secondary rotating electrical machine (8) and the at least one secondary wheel (3R, 3L) of the vehicle, a member for selectively interrupting the torque transmission (6) in the torque path, the member for selectively interrupting the torque transmission (6) having an open position and a closed position, method comprising: - a measuring step (101) in which an operating parameter of the secondary electrical assembly (43) is measured with the measuring system while the selective torque transmission interruption member (6) is in the closed position, - a comparison step (102) in which the measurement of the operating parameter of the secondary electrical assembly (43) is compared with a threshold, and - a deceleration step (103) in which, if the measurement of the operating parameter is greater than the threshold, the propulsion source (14, 22) of the at least one primary wheel (10R, 10L) and / or a braking system of the at least one primary wheel (10R, 10L) and / or of the at least one secondary wheel (3R, 3L) of the vehicle is controlled so as to control a deceleration of the vehicle.

10. Method for controlling a hybrid vehicle propulsion system or electrical apparatus according to claim 9, further comprising: - a step of controlling the opening (104) of the selective torque transmission interruption member (6) in which the passage to the open position of the selective torque transmission interruption member (6) is controlled, - a step of detecting (105) the position of the selective torque transmission interruption member (6) in which the position of the selective torque transmission interruption member is detected, - a step of interrupting the deceleration (106) if the selective torque transmission interruption member (6) is detected open during the step of detecting the position of the selective torque transmission interruption member (6).

11. Method for controlling a hybrid or electric vehicle propulsion system according to one of claims 9 and 10 in which the measuring system is a system for measuring the rotation speed of the secondary electrical machine (8), the operating parameter of the secondary electrical assembly (43) is the rotation speed of the secondary rotating electrical machine (8) and the threshold is a maximum rotation speed of the secondary rotating electrical machine (8).

12. Method for controlling a hybrid or electric vehicle propulsion system according to one of claims 9 and 10 wherein the secondary electrical assembly (8) comprises a first inverter / rectifier (9), the measurement system is a temperature measurement system, the operating parameter of the secondary electrical assembly (8) is an evaluation of the temperature of the first inverter / rectifier (9), the evaluation of the temperature of the first inverter / rectifier (9) being carried out by the temperature measurement system and the threshold is a maximum value of the temperature of the first inverter / rectifier (9).

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