Dual motor controller active discharge system and method

Abstract

This application relates to a dual-motor controller active discharge system and method. The system includes a DC-DC converter, a first relay, a bus capacitor, a first electric drive module, a second electric drive module, and a control unit. The control unit is configured to: activate the first discharge path when it is normal until the voltage of the bus capacitor is less than a preset threshold, then shut down the first discharge path; and activate a second and / or a third discharge path when the first discharge path is abnormal until the voltage of the bus capacitor is less than a preset threshold, then shut down the second and / or the third discharge path. This system enables active discharge without the need for external power devices, reducing costs, and avoids torque fluctuations, improving safety. It also prevents the inability to actively discharge in the event of a single point of failure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicles, in particular to a double-motor controller active discharge system and method. BACKGROUND

[0002] With the popularity of pure electric vehicles, the safety requirements of electric vehicles for electric drive systems in high-voltage environments are also increasingly high. In a high-voltage system composed of power batteries, high-voltage relays, inverters (also known as motor controllers), DCDC converters, permanent magnet synchronous motors, etc., in order to protect the safety and reliability of the electric drive system of the pure electric vehicle and avoid harm to the human body, it is necessary to realize the discharge of high-voltage electric energy.

[0003] In the traditional technology, a DCDC converter is usually used for active discharge, but the discharge capacity of the DCDC converter is limited and is greatly affected by the load energy and the working voltage itself. In actual application, the main positive relay of the electric drive system and the main positive relay of the DCDC converter are often controlled by two independent relays. However, when the vehicle stops, the two main positive relays are disconnected, at which time the bus capacitor cannot be actively discharged through the DCDC converter. Moreover, when the DCDC converter fails, active discharge cannot be completed. SUMMARY

[0004] Therefore, it is necessary to provide a double-motor controller active discharge system and method to realize safe discharge when a single-point failure occurs.

[0005] To achieve the above object and other objects, one aspect of the present application provides a double-motor controller active discharge system, which comprises:

[0006] a DC converter configured to be electrically connected to the positive pole of a DC power supply at a first end and to the negative pole of the DC power supply at a second end;

[0007] a first relay configured to be electrically connected to the positive pole of the DC power supply and the first end of the DC converter at a first end;

[0008] a bus capacitor configured to be electrically connected to the second end of the first relay at a first end and to the negative pole of the DC power supply at a second end;

[0009] a first electric drive module connected in parallel with the bus capacitor, configured to consume the energy of the bus capacitor according to a second discharge path when a first discharge path is abnormal;

[0010] a second electric drive module connected in parallel with the first electric drive module, configured to consume the energy of the bus capacitor according to a third discharge path when the first discharge path is abnormal;

[0011] a control unit configured to: start the first discharge path when the first discharge path is normal until the voltage of the bus capacitor is less than a preset threshold, close the first discharge path, start the second discharge path and / or the third discharge path when the first discharge path is abnormal until the voltage of the bus capacitor is less than the preset threshold, and close the second discharge path and / or the third discharge path.

[0012] In the active discharge system of the double-motor controller in the above embodiment, the energy of the bus capacitor is discharged through the DC converter as the first discharge path, the second discharge path and the third discharge path are used as redundant paths, and the energy of the bus capacitor is discharged through the first electric drive module and / or the second electric drive module when the first discharge path is abnormal, so that the active discharge is realized without additional power devices, the cost is reduced, the torque fluctuation is not generated, and the safety is improved.

[0013] In one of the embodiments, the system further comprises:

[0014] a second relay configured to have a first end electrically connected to the positive pole of the DC power supply and a second end electrically connected to the first end of the DC converter, so as to distinguish the case that the electric drive system and the DC converter do not share a relay.

[0015] In one of the embodiments, the control unit is further configured to:

[0016] determine whether the second discharge path is normal;

[0017] if the second discharge path is normal, switch the gear of the second discharge path to neutral and start the second discharge path until the voltage of the bus capacitor is less than the preset threshold, and then close the second discharge path;

[0018] if the second discharge path is abnormal, start the third discharge path until the voltage of the bus capacitor is less than the preset threshold, and then close the third discharge path, so that the first electric drive module is used for discharging in the case that the electric drive system and the DC converter do not share a relay, and the second electric drive module is used for discharging in the case that the second discharge path is abnormal.

[0019] In one of the embodiments, the first electric drive module comprises:

[0020] a first inverter connected in parallel with the bus capacitor, used for transmitting the energy of the bus capacitor to a first drive motor;

[0021] a first drive motor electrically connected to the first inverter, used for consuming the energy transmitted by the first inverter;

[0022] The first transmission is electrically connected with the first inverter and the first drive motor, so that when the second discharge path is started, the first transmission is controlled by the first inverter to transfer the energy of the bus capacitor to the first drive motor for consumption.

[0023] In one of the embodiments, the second electric drive module comprises:

[0024] The second inverter is connected in parallel with the bus capacitor, and is used to transmit the energy of the bus capacitor to the second drive motor;

[0025] The second drive motor is electrically connected with the first inverter, and is used to consume the energy transmitted by the second inverter;

[0026] The second transmission is electrically connected with the second inverter and the second drive motor, so that when the third discharge path is started, the second transmission is controlled by the second inverter to transfer the energy of the bus capacitor to the second drive motor for consumption.

[0027] In one of the embodiments, the first discharge path comprises consuming the energy of the bus capacitor through the DC converter;

[0028] The second discharge path comprises transferring the energy of the bus capacitor to the first drive motor through the first inverter for consumption;

[0029] The third discharge path comprises transferring the energy of the bus capacitor to the second drive motor through the second inverter for consumption. The first discharge path is set as a preferred path, and the second discharge path and the third discharge path are set as redundant paths, so as to avoid single point failure.

[0030] Another aspect of the present application provides a double-motor controller active discharge method, which comprises:

[0031] When the electric drive system shares the first relay with the DC converter, it is determined whether the first discharge path is normal;

[0032] If normal, the first discharge path is started until the voltage of the bus capacitor is less than a preset threshold, and then the first discharge path is closed;

[0033] If abnormal, the second discharge path and / or the third discharge path is started until the voltage of the bus capacitor is less than a preset threshold, and then the second discharge path and / or the third discharge path is closed.

[0034] In the double-motor controller active discharge method of the above embodiment, in the case where the electric drive system and the DC converter share the first relay, discharge is first performed through the first discharge path, and if it is found that the first discharge path is abnormal, the redundant path, i.e., the second discharge path and / or the third discharge path, is started to discharge. This effectively avoids the situation that active discharge cannot be performed due to a single point failure.

[0035] In one of the embodiments, the double-motor controller active discharge method further comprises:

[0036] When the electric drive system and the DC converter do not share the first relay, it is determined whether the second discharge path is normal;

[0037] If the second discharge path is normal, the gear of the second discharge path is switched to neutral and the second discharge path is started until the voltage of the bus capacitor is less than the preset threshold, and then the second discharge path is closed;

[0038] If the second discharge path is abnormal, the third discharge path is started until the voltage of the bus capacitor is less than the preset threshold, and then the third discharge path is closed. In this way, in the case where the electric drive system and the DC converter do not share the relay, the second discharge path is first used, and if the second discharge path is abnormal, the third discharge path is started.

[0039] In one of the embodiments, the first discharge path comprises consuming the energy of the bus capacitor through the DC converter;

[0040] The second discharge path comprises transferring the energy of the bus capacitor to the first drive motor through the first inverter for consumption;

[0041] The third discharge path comprises transferring the energy of the bus capacitor to the second drive motor through the second inverter for consumption.

[0042] In one of the embodiments, the preset threshold is 55V-65V. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0044] Figure 1 Structure diagram of the active discharge circuit in the prior art

[0045] Figure 2A structure diagram of a double-motor controller active discharge system provided in an embodiment of the present application is shown in the figure.

[0046] Figure 3 A structure diagram of a double-motor controller active discharge system provided in another embodiment of the present application is shown in the figure.

[0047] Figure 4 A flow diagram of a double-motor controller active discharge method provided in an embodiment of the present application is shown in the figure.

[0048] Figure 5 A flow diagram of a double-motor controller active discharge method provided in another embodiment of the present application is shown in the figure.

[0049] Explanation of reference signs:

[0050] 10, DC converter; 20, first relay; 21, second relay; 30, bus capacitor; 40, first electric drive module; 41, first inverter; 42, first drive motor; 43, first transmission; 50, second electric drive module; 51, second inverter; 52, second drive motor; 53, second transmission; 60, control unit. DETAILED DESCRIPTION

[0051] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used herein in the specification merely describe specific embodiments of the present application for the purpose of the description and are not intended to limit the present application.

[0053] It can be understood that the terms "first", "second", and the like can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element

[0054] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through a central element. In addition, "connected" in the following embodiments should be understood as "electrically connected", "communicatively connected", and the like if there is transmission of electrical signals or data between the connected objects.

[0055] As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", or the like, as used herein, specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0056] As described in the background, in the prior art, the DCDC converter is usually used for active discharge, but the discharge capacity of the DCDC converter is limited and is greatly affected by the load energy and the working voltage itself. In actual applications, the main positive relay of the electric drive system and the main positive relay of the DCDC converter are often controlled by two independent relays, such as Figure 1 However, when the vehicle stops, the two main positive relays are disconnected, at which time the bus capacitor cannot be actively discharged through the DCDC converter. Moreover, when the DCDC converter fails, active discharge cannot be completed.

[0057] In the prior art, there are also semiconductor switching devices and discharge resistors for active discharge or an inverter for transferring the energy of the high-voltage bus capacitor to the drive motor for consumption. However, these two methods also have their own shortcomings. The first method has a high cost and occupies additional space, and there is a situation of being unable to actively discharge due to a single point failure. The second method causes torque fluctuation through the current in the motor winding, which affects the comfort of the vehicle.

[0058] Therefore, please refer to Figure 2In one embodiment of the present application, a dual-motor controller active discharge system is provided, which comprises a DC converter 10, a first relay 20, a bus capacitor 30, a first electric drive module 40, a second electric drive module 50, and a control unit 60. The DC converter 10 is configured to have a first end electrically connected to a positive pole of a DC power supply and a second end electrically connected to a negative pole of the DC power supply. The first relay 20 is configured to have a first end electrically connected to the positive pole of the DC power supply and the first end of the DC converter 10. The bus capacitor 30 is configured to have a first end electrically connected to a second end of the first relay 20 and a second end electrically connected to the negative pole of the DC power supply. The first electric drive module 40 is connected in parallel with the bus capacitor 30 and is configured to consume the energy of the bus capacitor 30 according to a second discharge path when a first discharge path is abnormal. The second electric drive module 50 is connected in parallel with the first electric drive module 40 and is configured to consume the energy of the bus capacitor 30 according to a third discharge path when the first discharge path is abnormal. The control unit 60 is configured to start the first discharge path when the first discharge path is normal and to close the first discharge path when the voltage of the bus capacitor 30 is less than a preset threshold. The control unit 60 is also configured to start the second discharge path and / or the third discharge path when the first discharge path is abnormal and to close the second discharge path and / or the third discharge path when the voltage of the bus capacitor 30 is less than the preset threshold.

[0059] Specifically, the first discharge path is used as a preferred path to discharge the energy of the bus capacitor 30 through the DC converter 10, and the second discharge path and the third discharge path are used as redundant paths to discharge the energy of the bus capacitor 30 through the first electric drive module 40 and / or the second electric drive module 50 when the first discharge path is abnormal. In this way, the active discharge can be achieved without the need for additional power devices, the cost is reduced, and the torque fluctuation is avoided, thereby improving the safety.

[0060] Please continue to refer to Figure 2 In one embodiment, the system further comprises a second relay 21, which is configured to have a first end electrically connected to the positive pole of the DC power supply and a second end electrically connected to the first end of the DC converter 10. In this way, the case where the electric drive system and the DC converter 10 do not share a relay is distinguished.

[0061] In one embodiment, the control unit 60 is further configured to:

[0062] determine whether the second discharge path is normal;

[0063] if the second discharge path is normal, switch the gear of the second discharge path to neutral and start the second discharge path until the voltage of the bus capacitor 30 is less than the preset threshold, and then close the second discharge path;

[0064] If the second discharge path is abnormal, the third discharge path is started until the voltage of the bus capacitor 30 is less than a preset threshold, and then the third discharge path is closed.

[0065] Specifically, when the DC converter 10 and the electric drive system composed of the first electric drive module 40 and the second electric drive module 50 do not share the same relay, that is, the electric drive system composed of the first electric drive module 40 and the second electric drive module 50 adopts the first relay 20, and the DC converter 10 adopts the second relay 21, the second discharge path is preferentially adopted. First, it is judged whether the second discharge path is normal, and in the case of abnormality of the second discharge path, the third discharge path is started to consume the energy of the bus capacitor 30. In order to first discharge through the first electric drive module 40 when the electric drive system and the DC converter 10 do not share, and to discharge through the second electric drive module 50 in the case of abnormality of the second discharge path.

[0066] Please refer to Figure 3 In one embodiment, the first electric drive module 40 includes a first inverter 41, a first drive motor 42, and a first transmission 43; the first inverter 41 is connected in parallel with the bus capacitor 30, for transmitting the energy of the bus capacitor 30 to the first drive motor 42; the first drive motor 42 is electrically connected with the first inverter 41, for consuming the energy transmitted by the first inverter 41; the first transmission 43 is electrically connected with the first inverter 41 and the first drive motor 42.

[0067] Specifically, when the second discharge path is started, the first transmission 43 is controlled by the first inverter 41 to transmit the energy of the bus capacitor 30 to the first drive motor 42 for consumption. Specifically, the control unit 60 includes a first control unit, which is placed in the interior of the first inverter 41.

[0068] Please continue to refer to Figure 3 In one embodiment, the second electric drive module 50 includes a second inverter 51, a second drive motor 52, and a second transmission 53; the second inverter 51 is connected in parallel with the bus capacitor 30, for transmitting the energy of the bus capacitor 30 to the second drive motor 52; the second drive motor 52 is electrically connected with the first inverter 41, for consuming the energy transmitted by the second inverter 51; the second transmission 53 is electrically connected with the second inverter 51 and the second drive motor 52.

[0069] Specifically, when the third discharge path is started, the energy of the bus capacitor 30 is transmitted to the second drive motor 52 for consumption by the second inverter 51 controlling the second transmission 53. Specifically, the control unit 60 further comprises a second control unit which is placed inside the second inverter 51.

[0070] In one embodiment, the first discharge path comprises consuming the energy of the bus capacitor 30 by the DC converter 10;

[0071] The second discharge path comprises transmitting the energy of the bus capacitor 30 to the first drive motor 42 for consumption by the first inverter 41;

[0072] The third discharge path comprises transmitting the energy of the bus capacitor 30 to the second drive motor 52 for consumption by the second inverter 51. The first discharge path is set as the preferred path, and the second discharge path and the third discharge path are set as the redundant paths so as to avoid single point failure.

[0073] As an example, please refer to Figure 4 In one embodiment of the present application, a double-motor controller active discharge method is provided, which comprises:

[0074] Step S100: When the electric drive system shares the first relay with the DC converter, it is determined whether the first discharge path is normal;

[0075] Step S120: If normal, the first discharge path is started until the voltage of the bus capacitor is less than a preset threshold, and then the first discharge path is closed;

[0076] Step S140: If abnormal, the second discharge path and / or the third discharge path is started until the voltage of the bus capacitor is less than a preset threshold, and then the second discharge path and / or the third discharge path is closed.

[0077] In the double-motor controller active discharge method of the above embodiment, when the electric drive system shares the first relay with the DC converter, the discharge is first performed through the first discharge path, and if it is found that the first discharge path is abnormal, the redundant path, i.e. the second discharge path and / or the third discharge path, is started to perform the discharge. This effectively avoids the situation that active discharge cannot be performed due to single point failure.

[0078] Please refer to Figure 5 In one embodiment, the method further comprises:

[0079] Step S200: When the electric drive system does not share the first relay with the DC converter, it is determined whether the second discharge path is normal;

[0080] Step S220: If the second discharge path is normal, switching the gear of the second discharge path to neutral and starting the second discharge path until the voltage of the bus capacitor is less than the preset threshold value, then closing the second discharge path;

[0081] Step S240: If the second discharge path is abnormal, starting the third discharge path until the voltage of the bus capacitor is less than the preset threshold value, then closing the third discharge path. In order to distinguish the case that the electric drive system and the DC converter do not share the relay, the second discharge path is used first, and the third discharge path is started if the second discharge path is abnormal.

[0082] In one of the embodiments, the first discharge path includes consuming the energy of the bus capacitor through the DC converter;

[0083] The second discharge path includes transferring the energy of the bus capacitor to the first drive motor for consumption through the first inverter;

[0084] The third discharge path includes transferring the energy of the bus capacitor to the second drive motor for consumption through the second inverter.

[0085] In one of the embodiments, the preset threshold value is 55V-65V.

[0086] Specifically, the national standard GB / T18488-2015 requires that the passive discharge time is less than 5 minutes to reduce the bus capacitor to below 60V, and the active discharge time is less than 3 seconds to reduce the bus capacitor to below 60V. Therefore, in some embodiments, the preset threshold value can be 55V, 60V or 65V. Since generally, when the electric vehicle stops running, the voltage of the high-voltage bus capacitor is 540VDC, if the preset threshold value is 60V, it is determined as the safety threshold voltage when 540VDC is reduced to 60VDC.

[0087] It should be understood that, although Figures 4-5 The steps in the flowchart of FIG. 1 are displayed in sequence according to the direction of the arrows, but these steps are not necessarily executed in sequence according to the direction of the arrows. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, Figures 4-5 At least part of the steps in the flowchart of FIG. 1 can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0088] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, storage, database or other medium used in each embodiment provided by the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0089] In the description of the present specification, the description of the terms "some embodiments", "other embodiments", "ideal embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0090] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, not all possible combinations of the technical features in the above embodiments are described, but as long as the combination of the technical features does not exist, it should be considered as the scope of the present specification.

[0091] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A dual-motor controller active discharge system, characterized in that, The system includes: A DC-DC converter is configured such that a first terminal is electrically connected to the positive terminal of a DC power supply, and a second terminal is electrically connected to the negative terminal of the DC power supply. The first relay is configured such that its first terminal is electrically connected to both the positive terminal of the DC power supply and the first terminal of the DC converter. The bus capacitor is configured such that: its first terminal is electrically connected to the second terminal of the first relay, and its second terminal is electrically connected to the negative terminal of the DC power supply; The first electric drive module is connected in parallel with the bus capacitor and is used to consume the energy of the bus capacitor according to the second discharge path when the first discharge path is abnormal. The second electric drive module is connected in parallel with the first electric drive module and is used to consume the energy of the bus capacitor according to the third discharge path when the first discharge path is abnormal. The control unit is configured to: activate the first discharge path when the first discharge path is normal until the voltage of the bus capacitor is less than a preset threshold and then close the first discharge path; activate the second discharge path and / or the third discharge path when the first discharge path is abnormal until the voltage of the bus capacitor is less than a preset threshold and then close the second discharge path and / or the third discharge path. The control unit is also configured to: When the electric drive system and the DC converter do not share the first relay, determine whether the second discharge path is normal; If the second discharge path is normal, switch the second discharge path to neutral and start the second discharge path until the voltage of the bus capacitor is less than the preset threshold and then shut down the second discharge path. If the second discharge path is abnormal, the third discharge path is activated until the voltage of the bus capacitor is less than a preset threshold, at which point the third discharge path is shut down.

2. The dual-motor controller active discharge system according to claim 1, characterized in that, The system also includes: The second relay is configured such that its first terminal is electrically connected to the positive terminal of the DC power supply, and its second terminal is electrically connected to the first terminal of the DC converter.

3. The dual-motor controller active discharge system according to any one of claims 1-2, characterized in that, The first electric drive module includes: The first inverter is connected in parallel with the bus capacitor and is used to transfer the energy of the bus capacitor to the first drive motor. The first drive motor is electrically connected to the first inverter and is used to consume the energy transmitted by the first inverter. The first transmission is electrically connected to both the first inverter and the first drive motor.

4. The dual-motor controller active discharge system according to claim 3, characterized in that, The second electric drive module includes: The second inverter is connected in parallel with the bus capacitor and is used to transfer the energy of the bus capacitor to the second drive motor. The second drive motor is electrically connected to the first inverter and is used to consume the energy transmitted by the second inverter. The second transmission is electrically connected to both the second inverter and the second drive motor.

5. The dual-motor controller active discharge system according to claim 4, characterized in that, The first discharge path includes consuming the energy of the bus capacitor through the DC-DC converter; The second discharge path includes transferring the energy of the bus capacitor to the first drive motor for consumption via the first inverter; The third discharge path includes transferring the energy of the bus capacitor to the second drive motor for consumption via the second inverter.

6. A method for active discharge of a dual-motor controller, characterized in that, The method includes: When the electric drive system and the DC converter share the first relay, determine whether the first discharge path is normal. If normal, the first discharge path is started until the voltage of the bus capacitor is less than the preset threshold, at which point the first discharge path is closed. If an abnormality occurs, the second discharge path and / or the third discharge path will be activated until the voltage of the bus capacitor is less than a preset threshold, at which point the second discharge path and / or the third discharge path will be shut down. The method further includes: When the electric drive system and the DC converter do not share the first relay, determine whether the second discharge path is normal; If the second discharge path is normal, switch the second discharge path to neutral and start the second discharge path until the voltage of the bus capacitor is less than the preset threshold and then shut down the second discharge path. If the second discharge path is abnormal, the third discharge path is activated until the voltage of the bus capacitor is less than a preset threshold, at which point the third discharge path is shut down.

7. The active discharge method for a dual-motor controller according to claim 6, characterized in that, The first discharge path includes consuming the energy of the bus capacitor through the DC-DC converter; The second discharge path includes transferring the energy of the bus capacitor to the first drive motor for consumption via the first inverter; The third discharge path includes transferring the energy of the bus capacitor to the second drive motor for consumption via the second inverter.

8. The active discharge method for a dual-motor controller according to any one of claims 6-7, characterized in that, The preset threshold is 55V-65V.

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