Powertrains, distributed powertrains and vehicles

Abstract

The application provides a distributed disconnected power assembly, a control method and a vehicle, relates to the field of new energy vehicles, and can be applied to a double-drive electric vehicle or a hybrid vehicle. The power assembly comprises a driving motor and a motor controller. The motor controller is used for receiving DC bus power through a first DC side disconnecting device and outputting AC power to the driving motor to drive the driving motor. The current size received by the DC bus from a power battery is greater than the current size passing through the first DC side disconnecting device. When the current size passing through the first DC side disconnecting device is greater than a first threshold value, the first DC side disconnecting device disconnects the connection between the DC bus and the motor controller. According to the application, when a single electric component appears a short circuit, only the corresponding DC side disconnecting device is disconnected, the fault is isolated, the normal work of other electric components is ensured, and the safety of the vehicle is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy vehicles, and more particularly, to a power assembly, a distributed power assembly and a vehicle. BACKGROUND

[0002] With the improvement of environmental awareness and the continuous development of electric vehicle technology, the demand for dual-drive electric vehicles in the market is increasing. When a short circuit occurs in the high-voltage circuit of an electric vehicle, in order to protect the passengers and the electric vehicle, it is necessary to disconnect the power supply of the power battery when a short circuit occurs in the high-voltage circuit, otherwise the drive motor will be burned out or even the vehicle will be on fire.

[0003] The current common solution is to set a total protection device when the vehicle direct current bus power distribution architecture outputs from the power battery pack, and then supply power to each load mounted on the direct current bus. At this time, if a load mounted on the high-voltage bus is short-circuited, the total protection device will be disconnected, and the vehicle high-voltage bus will be powered off, thereby protecting the safety of the vehicle and the passengers. However, the disconnection of the total protection device will cause all loads mounted on the high-voltage bus to be powered off due to the short circuit of one load, resulting in loss of power.

[0004] Therefore, how to isolate the short circuit fault when one load is short-circuited is a problem to be solved. SUMMARY

[0005] The present application provides a power assembly, a distributed power assembly and a vehicle. By increasing a direct current side disconnection device at the front end of each high-voltage electrical component connected to the direct current bus, when a short circuit fault occurs in one load, only the direct current side disconnection device in front of the corresponding electrical component is disconnected, the fault is isolated, and the normal operation of other electrical components can be ensured, thereby effectively improving the safety of the vehicle.

[0006] In a first aspect, the present application provides a power assembly, the power assembly comprising a drive motor and a motor controller, wherein the motor controller is configured to receive power from a direct current bus through a first direct current side disconnection device and output alternating current to the drive motor to drive the drive motor, the direct current bus receiving a current from a power battery, and the size of the current received by the direct current bus is greater than the size of the current passing through the first direct current side disconnection device. When the size of the current passing through the first direct current side disconnection device is greater than a first threshold value, the first direct current side disconnection device disconnects the connection between the direct current bus and the motor controller.

[0007] Optionally, when the voltage of the current passing through the first DC side disconnect device is less than a fifth threshold value, the first DC side disconnect device disconnects the connection between the DC bus and the motor controller. Alternatively, when the rate of change of the voltage of the current passing through the first DC side disconnect device is greater than a sixth threshold value, the first DC side disconnect device disconnects the connection between the DC bus and the motor controller. Alternatively, when the magnitude of the current passing through the first DC side disconnect device is greater than a first threshold value and / or the voltage of the current passing through the first DC side disconnect device is less than a fifth threshold value and / or the rate of change of the voltage of the current passing through the first DC side disconnect device is greater than a sixth threshold value, the first DC side disconnect device disconnects the connection between the DC bus and the motor controller.

[0008] It should be understood that whether the power assembly or the DC bus is short-circuited can be determined by detecting the current and / or the voltage, so as to control whether the DC side disconnect device is disconnected.

[0009] In this application, the DC side disconnect device can be a controlled switching device such as a switch tube, a relay, etc., or an automatic overcurrent fuse such as a fuse, a fuse link, etc., which is not limited in this application. If the DC side disconnect device is a controlled switching device, it can be connected to the control circuit in the motor controller or the control circuit in the battery management system and controlled by the control circuit.

[0010] The DC bus includes a positive DC bus and a negative DC bus, the positive DC bus is connected to the positive electrode of the power battery, and the negative DC bus is connected to the negative electrode of the power battery. The DC bus receives a first DC current from the power battery, which can also be understood as the current output by the power battery. A plurality of electrical components can be mounted on the DC bus, and the power assembly can be mounted on the DC bus. The power assembly receives a second DC current from the DC bus, and since other electrical components are also mounted on the DC bus, the second DC current received by the power assembly is smaller than the first DC current. The second DC current is input to the power assembly through the DC side disconnect device. When a short-circuit fault occurs in the power assembly, the second DC current will suddenly increase. When the magnitude of the second DC current is greater than a first threshold value, it indicates that a short-circuit fault occurs in the power assembly. In order to protect the electrical components, the DC side disconnect device is disconnected, and the connection between the power assembly and the DC bus is disconnected, so that the short-circuit fault of the power assembly is isolated and does not affect the normal operation of the other electrical components mounted on the DC bus.

[0011] According to the scheme of the application, the DC side disconnect device disconnects the connection between the input end of the motor controller and the DC bus when a short-circuit fault occurs in the power assembly, so that the motor controller stops receiving power supply from the power battery, thereby avoiding the influence of the fault of the power assembly on the normal operation of the remaining electrical components connected to the power battery.

[0012] In some implementations of the first aspect, the current received by the DC bus from the power battery is greater than or equal to the current passing through the first DC-side disconnect device. The power battery supplies power to the power assembly through the DC bus. When the power battery supplies power to multiple power assemblies through the DC bus, the multiple power assemblies are in a parallel relationship. In this case, the current received by the DC bus from the power battery is greater than the current passing through the first DC-side disconnect device, or it can be understood that the current passing through the DC bus is greater than the current passing through the first DC-side disconnect device. For example, when the vehicle is a front-rear dual-drive vehicle, and the front-rear dual-drive two power assemblies are working at the same time, the current passing through the DC bus is greater than the current passing through the first DC-side disconnect device.

[0013] When the power battery supplies power to only one power assembly through the DC bus, the current received by the DC bus from the power battery is equal to the current passing through the first DC-side disconnect device, or it can be understood that the current passing through the DC bus is equal to the current passing through the first DC-side disconnect device. For example, when the vehicle is a single-drive vehicle, and the power battery supplies power to only one power assembly through the DC bus, the current passing through the DC bus is greater than the current passing through the first DC-side disconnect device.

[0014] In some implementations of the first aspect, the motor controller includes a housing for accommodating the first DC-side disconnect device and the inverter circuit, and the housing includes a DC input port and an AC output port. The inverter circuit is connected to the DC input port through the first DC-side disconnect device and receives power from the DC bus through the DC input port. The inverter circuit is configured to output AC power through the AC output port.

[0015] The DC-side disconnect device can be arranged in the motor controller. The DC bus is connected to the DC-side disconnect device in the motor controller through a port of the motor controller housing. The DC-side disconnect device inputs the current received from the DC bus to the inverter circuit.

[0016] According to the scheme of the present application, the DC-side disconnect device is integrated in the motor controller, which has high integration and improves the reliability of the motor controller.

[0017] In some implementations of the first aspect, the inverter circuit includes a three-phase bridge arm, and a bridge arm midpoint of the three-phase bridge arm is configured to be connected to a three-phase winding of a driving motor through the AC-side disconnect device. When the current passing through any one phase of the three-phase bridge arm is greater than a second threshold value, the AC-side disconnect device is configured to disconnect the connection between the any one phase of the three-phase bridge arm and the winding of the driving motor.

[0018] The power assembly can further include an alternating current side disconnect device. The alternating current side disconnect device can be a controlled switching device such as a relay, a switch tube, or the like. The alternating current side disconnect device can be a plurality of switching devices arranged separately or can be an integral switching device. The alternating current side disconnect device is used to connect the three-phase bridge arms of the motor controller and the three-phase windings of the drive motor. When the current of any one of the three-phase bridge arms is greater than the second threshold value, a short circuit fault can occur in the any one of the three-phase bridge arms. At this time, the fault of the phase bridge arm needs to be isolated, and the alternating current side disconnect device is used to disconnect the phase bridge arm, so as to isolate the short circuit fault, and the remaining phase bridge arms can continue to output current, thereby realizing the operation of the drive motor in the short time of the phase loss.

[0019] In some implementations of the first aspect, the motor controller is configured to control the drive motor to reduce the output torque in response to the current of any one of the three-phase bridge arms being greater than the second threshold value.

[0020] It is easy to understand that when a single switch tube module in a phase bridge arm is short-circuited, the current on the phase bridge arm will only appear overcurrent when the switch tube module is closed. Therefore, the overcurrent signal in the motor controller will be detected to be temporarily low and then return to normal. At this time, only the alternating current side disconnect device corresponding to the phase bridge arm of the module needs to be disconnected. However, due to the lack of one-phase current, the torque that can be output by the drive motor is correspondingly reduced.

[0021] According to the scheme of the present application, the alternating current side disconnect device is added to the power line between the motor controller and the three-phase drive motor. The alternating current side disconnect device can isolate the short circuit fault on the inverter circuit. When a single module fails, the drive motor can operate in the short time of the phase loss, and the power is not lost immediately, thereby improving the safety of the vehicle.

[0022] In some implementations of the first aspect, the motor controller is configured to control the first direct current side disconnect device to disconnect in response to the current of any one of the three-phase bridge arms being greater than the second threshold value for a duration greater than the first duration.

[0023] It is easy to understand that when the upper and lower bridge arm switch modules in a phase bridge arm are short-circuited, the overcurrent signal on the motor controller will be continuously low. At this time, the direct current side disconnect device needs to be disconnected to avoid the influence of the direct current bus on the loss of the power of the whole vehicle.

[0024] In some implementations of the first aspect, the motor controller is configured to control the alternating current side disconnect device to disconnect the connection between at least two of the three-phase bridge arms and the windings of the drive motor in response to the current of any one of the three-phase bridge arms being greater than the second threshold value for a duration greater than the first duration.

[0025] When the upper and lower bridge switch modules in a phase arm are short-circuited, the AC side disconnecting device corresponding to at least two phase arms in the three-phase bridge arm is disconnected, so that the current in the motor controller does not form a loop, the fault is isolated, and the DC bus is avoided from being affected.

[0026] In combination with the first aspect, in some implementations of the first aspect, the first time length is less than or equal to 10 microseconds.

[0027] Since the overcurrent signal only appears temporarily when a single module fails, the overcurrent signal can appear for a time length of less than or equal to 10 microseconds.

[0028] It should be understood that the first time length can be flexibly set to control the responsiveness of the DC disconnecting device to the short-circuit fault and avoid misjudgment or missed judgment.

[0029] According to the scheme of the present application, by adding the AC side disconnecting device, when a short-circuit fault occurs in the inverter circuit of the motor controller, the AC side disconnecting device is disconnected, and the DC bus is avoided from being affected to cause the loss of power of the whole vehicle.

[0030] In combination with the first aspect, in some implementations of the first aspect, the DC bus is configured to receive power from the power battery through the protection device, and the protection device is disconnected when the current received by the DC bus from the power battery is greater than a third threshold value for a second time length; and the first DC side disconnecting device is disconnected before the protection device is disconnected when the current received by the DC bus from the power battery is greater than the third threshold value and / or the current passing through the first DC side disconnecting device is greater than a first threshold value.

[0031] It should be understood that the first threshold value, the second threshold value, and the third threshold value are preset, and the present application does not limit the specific values of the first threshold value, the second threshold value, and the third threshold value. By setting the sizes of the first threshold value, the second threshold value, and the third threshold value, the sensitivity of the DC side disconnecting device and the AC side disconnecting device to the current can be accurately adjusted, and the applicability of the motor controller is strong.

[0032] The protection device is connected to the positive electrode and / or the negative electrode of the power battery at one end and connected to the DC bus at the other end. The protection device can be a total fuse. When overcurrent occurs on the DC bus, the protection device will be blown after the second time length, thereby protecting the power battery and the electrical component. In order to prevent the protection device from being disconnected when a single electrical component is short-circuited, thereby affecting other normal electrical components, the DC side disconnecting device is set to be disconnected before the protection device when overcurrent occurs.

[0033] According to the scheme of the present application, by making the delay-off time of the DC side disconnecting device less than that of the protection device, when a single power assembly is short-circuited, the protection device will not be disconnected, and other normal electrical components will not be affected, thereby achieving power redundancy.

[0034] In combination with the first aspect, in some implementations of the first aspect, the power assembly further includes a generator, and the motor controller further includes a generator inverter circuit; the generator inverter circuit is configured to receive alternating current generated by the generator and supply the direct current bus with power through the third direct current side disconnect device; when the current flowing through the third direct current side disconnect device is greater than the first threshold value, the third direct current side disconnect device disconnects the connection between the direct current bus and the generator inverter circuit.

[0035] For a hybrid vehicle, other components such as a generator are also connected to the direct current bus, and a direct current side disconnect device is also added at the front end of the direct current bus where the other components are connected, so that when a single component connected to the direct current bus is short-circuited, the direct current side disconnect device is disconnected, and the normal operation of other components is not affected.

[0036] In the second aspect, the application provides a distributed power assembly, which includes a motor controller, two drive motors, and two direct current side disconnect devices, and is configured to drive two front wheels or two rear wheels of a vehicle; the motor controller includes a first inverter circuit and a second inverter circuit, the first inverter circuit is configured to receive power from the direct current bus through one direct current side disconnect device and output alternating current to one drive motor, and the second inverter circuit is configured to receive power from the direct current bus through the other direct current side disconnect device and output alternating current to the other drive motor; the direct current bus is configured to receive power from a power battery, and the current received by the direct current bus from the power battery is greater than the current flowing through one direct current side disconnect device and the current flowing through the other direct current side disconnect device; when the current flowing through one direct current side disconnect device is greater than the first threshold value, one direct current side disconnect device disconnects the connection between the direct current bus and the first inverter circuit; when the current flowing through the other direct current side disconnect device is greater than the first threshold value, the other direct current side disconnect device disconnects the connection between the direct current bus and the second inverter circuit.

[0037] The vehicle can be a distributed drive motor architecture, and the two drive motors are configured to drive two front wheels or two rear wheels and are controlled by the motor controller. The motor controller includes two inverter circuits configured to output current to the two drive motors, respectively. The two inverter circuits are connected to the direct current bus through two direct current side disconnect devices, respectively, and when a short-circuit overcurrent occurs in any one of the inverter circuits, only the corresponding direct current side disconnect device is disconnected, so that the fault can be isolated, and the other normal inverter circuit can output current to the drive motor.

[0038] It should be understood that the application does not limit the specific types of the two direct current side disconnect devices. The two protection devices can be circuit breakers, fuses, relays, etc., and the specific types can be selected according to actual implementation. In addition, the one direct current side disconnect device and the other direct current side disconnect device can be of the same type or different types, and the application embodiments do not limit this.

[0039] According to the scheme of the present application, for the motor controller of the distributed drive motor, the direct current bus and the inverter circuit are connected through the direct current side disconnecting device respectively, the connection between the fault inverter circuit and the direct current bus can be disconnected only, thereby not affecting the normal operation of the drive motor, and power redundancy is realized.

[0040] In combination with the second aspect, in some implementations of the second aspect, the motor controller comprises a housing for accommodating the first inverter circuit, the second inverter circuit and the two direct current side disconnecting devices, the housing comprises two direct current input ports and two alternating current output ports; wherein the first inverter circuit is connected to one direct current input port through one direct current side disconnecting device and receives direct current bus power supply through the one direct current input port; the first inverter circuit is configured to output alternating current through one alternating current output port; the second inverter circuit is connected to the other direct current input port through the other direct current side disconnecting device and receives direct current bus power supply through the other direct current input port; the second inverter circuit is configured to output alternating current through the other alternating current output port.

[0041] In a possible implementation, the two inverter circuits and the two direct current side disconnecting devices can be assembled in a containing cavity formed in the housing of the motor controller.

[0042] In another possible implementation, the housing of the motor controller forms two containing cavities, and the first inverter circuit and the second inverter circuit are assembled in different containing cavities, at this time one direct current side disconnecting device is assembled in the same containing cavity as the first inverter circuit, and the other direct current side disconnecting device is assembled in the same containing cavity as the second inverter circuit.

[0043] In combination with the second aspect, in some implementations of the second aspect, the bridge arm midpoint of the three-phase bridge arm of the first inverter circuit is configured to connect the three-phase winding of one drive motor through the first alternating current side disconnecting device, and the bridge arm midpoint of the three-phase bridge arm of the second inverter circuit is configured to connect the three-phase winding of the other drive motor through the second alternating current side disconnecting device; when the current through any one phase bridge arm of the three-phase bridge arm of the first inverter circuit is greater than the second threshold value, the first alternating current side disconnecting device is configured to disconnect the connection between the any one phase bridge arm and the winding of one drive motor, and the motor controller is configured to control the remaining phase bridge arms of the first inverter circuit to output current and drive one drive motor, and the output torque of one drive motor is reduced; when the current through any one phase bridge arm of the three-phase bridge arm of the second inverter circuit is greater than the second threshold value, the second alternating current side disconnecting device is configured to disconnect the connection between the any one phase bridge arm and the winding of the other drive motor, and the motor controller is configured to control the remaining phase bridge arms of the second inverter circuit to output current and drive the other drive motor, and the output torque of the other drive motor is reduced.

[0044] It should be understood that when a short circuit fault occurs in one of the three-phase bridge arms, the AC side disconnect device corresponding to the phase bridge arm can be disconnected, and the remaining phase bridge arms can work normally. At this time, the driving motor can operate in a short time with a missing phase, but the torque output by the driving motor at this time will be smaller than that when working normally.

[0045] In combination with the second aspect, in some implementations of the second aspect, the motor controller is configured to, in response to a duration for which the current of any one of the three-phase bridge arms of the first inverter circuit is greater than the second threshold being greater than the first duration, control one DC side disconnect device to disconnect, and control the first AC side disconnect device to disconnect a connection between at least two of the three-phase bridge arms of the first inverter circuit and the winding of the driving motor; and in response to a duration for which the current of any one of the three-phase bridge arms of the second inverter circuit is greater than the second threshold being greater than the first duration, control another DC side disconnect device to disconnect, and control the first AC side disconnect device to disconnect a connection between at least two of the three-phase bridge arms of the second inverter circuit and the winding of the other driving motor.

[0046] When the overcurrent signal is continuously low, the phase bridge arm is short-circuited, and at this time, the inverter circuit needs to be disconnected from the bus to protect other electrical components, and the corresponding driving motor also stops outputting torque.

[0047] In a third aspect, the present application provides a vehicle, which comprises a power battery, a first power assembly and a second power assembly, the first power assembly is configured to drive two front wheels of the vehicle, and the second power assembly is configured to drive two rear wheels of the vehicle; wherein the first power assembly comprises a first motor controller and a first driving motor, the first motor controller is configured to receive power supply from a DC bus through a first DC side disconnect device and output AC power to the first driving motor; the second power assembly comprises a second motor controller and a second driving motor, the second motor controller is configured to receive power supply from the DC bus through a second DC side disconnect device and output AC power to the second driving motor; the DC bus is configured to receive power supply from the power battery, and a current size received by the DC bus from the power battery is greater than a current size passing through the first DC side disconnect device and a current size passing through the second DC side disconnect device; when the current size passing through the first DC side disconnect device is greater than a first threshold, the first DC side disconnect device disconnects a connection between the DC bus and the first motor controller; when the current size passing through the second DC side disconnect device is greater than a fourth threshold, the second DC side disconnect device disconnects a connection between the DC bus and the second motor controller.

[0048] The first threshold and the fourth threshold can be equal or not equal. Since the impedances of different circuits can be different, different thresholds can be set for overcurrent protection of different power assemblies.

[0049] The vehicle can be a dual-drive vehicle including two power assemblies, for example, a front drive power assembly and a rear drive power assembly. The specific type of power assembly is not limited in the present application, and the power assembly can be a centralized power assembly, a distributed motor power assembly, or a wheel-side motor power assembly.

[0050] The two power assemblies are connected to the DC bus through the DC side disconnect devices respectively, so that when a short circuit fault occurs in one of the power assemblies, the corresponding DC side disconnect device is disconnected, and the other power assembly can continue to drive the vehicle without being affected.

[0051] In combination with the third aspect, in some implementations of the third aspect, the power battery includes a second housing for accommodating the first DC side disconnect device and the second DC side disconnect device, and the second housing includes two DC output ports; wherein the power battery is connected to one DC output port through the first DC side disconnect device and supplies power to the first motor controller through the one DC output port; and the power battery is connected to the other DC output port through the second DC side disconnect device and supplies power to the second motor controller through the other DC output port.

[0052] According to the scheme of the present application, the DC side disconnect device can be located in the motor controller, and if it is a controlled switch device, it can be controlled by the motor controller in response to the fast, which is conducive to improving the safety of the vehicle. The DC side disconnect device can also be located in the power battery, and the power battery is connected to the power assembly through multiple DC side disconnect devices, which is conducive to improving the safety of the vehicle.

[0053] In combination with the third aspect, in some implementations of the third aspect, the first power assembly further includes a generator, and the first motor controller further includes a generator inverter circuit; or the second power assembly further includes a generator, and the second motor controller further includes a generator inverter circuit; the generator inverter circuit is used to receive alternating current generated by the generator and supply power to the DC bus through the third DC side disconnect device; when the current through the third DC side disconnect device is greater than a first threshold value, the third DC side disconnect device disconnects the connection between the DC bus and the generator inverter circuit.

[0054] The vehicle can be a hybrid vehicle, and the hybrid power assembly can also be connected to the DC bus through the DC side disconnect device. When a short circuit fault occurs in the generator, by disconnecting the third DC side disconnect device, the work of other normal power assemblies can be guaranteed, and other components are not affected.

[0055] In combination with the third aspect, in some implementations of the third aspect, when the current received by the DC bus from the power battery is greater than a third threshold value, the first DC side disconnect device is disconnected; and when the current received by the DC bus from the power battery is still greater than the third threshold value after the first DC side disconnect device is disconnected, the second DC side disconnect device is disconnected.

[0056] According to the scheme of the present application, when overcurrent occurs on the DC bus, in order to protect the safety of the power battery and the electrical components, the DC side disconnect device corresponding to the power assembly can be sequentially disconnected until the overcurrent condition on the DC bus no longer occurs, thereby improving the safety of the vehicle.

[0057] It should be understood that the various implementations of the first aspect and the third aspect can be combined, for example, the AC side disconnect device can also be added in the various implementations of the third aspect, which will not be described here.

[0058] Specifically, the beneficial effects of other aspects can refer to the beneficial effects described in the first aspect, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 is a schematic diagram of a DC bus protection device provided by the present application;

[0060] Figure 2 is a schematic diagram of several vehicle architectures provided by the present application;

[0061] Figure 3 is a schematic diagram of a distributed disconnect device provided by an embodiment of the present application;

[0062] Figure 4 is a schematic diagram of a power assembly provided by an embodiment of the present application;

[0063] Figure 5 is a schematic diagram of a distributed power assembly disconnect device provided by an embodiment of the present application;

[0064] Figure 6 is a schematic diagram of a hybrid vehicle disconnect device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0065] The technical solutions in the present application will be described below with reference to the accompanying drawings. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application, i.e., the present application is not limited to the described embodiments.

[0066] With the improvement of environmental awareness and the continuous development of vehicle technology, the demand for dual-motor drive vehicles and multi-motor drive vehicles in the market is increasing. When a short circuit occurs in the high-voltage circuit of an electric vehicle, in order to protect the safety of passengers and the electric vehicle, it is necessary to disconnect the power battery supply when a high-voltage circuit short circuit occurs, otherwise the drive motor will be burned out and even cause the vehicle to catch fire.

[0067] In one possible implementation, as Figure 1As shown, a total protection device is provided at the output end of the power battery, and each load such as a drive assembly is powered through a DC bus. For example, a front-rear multi-motor system is used in a double-motor electric vehicle, and the front and rear electric drives share the same high-voltage bus to receive power from the power battery. If one of the electric drives fails, the protection device on the DC bus will be blown, so that the power battery no longer outputs current, thereby ensuring the safety of the vehicle and passengers.

[0068] It should be understood that the above implementation will cause normal power components such as normal power assemblies to lose power and thus lose power.

[0069] Based on the above problems, the present application provides a distributed disconnected power assembly, a control method and a vehicle. By adding a DC side disconnection device at the front end of each high-voltage power component inputting the DC bus, when a short circuit fault occurs in one load, only the DC side disconnection device in front of the corresponding power component is disconnected, the fault is isolated, and the other power components can work normally, effectively improving the safety of the vehicle.

[0070] Figure 2 is a schematic diagram of several possible vehicle 10 architectures provided by the present application.

[0071] As shown in (a) of Figure 2 , the vehicle 10 can include a power battery (not shown in Figure 2 ), a first power assembly 20, a second power assembly 21, and four wheels. The first power assembly 20 includes a first drive motor 201 and a first motor controller 202, and the first motor controller 202 is configured to output alternating current to the first drive motor 201 to drive the first drive motor 201. The first power assembly 20 is configured to drive two front wheels of the vehicle 10. The second power assembly 21 includes a second drive motor 203 and a second motor controller 204, and the second motor controller 204 is configured to output alternating current to the second drive motor 203 to drive the second drive motor 203. The second power assembly 21 is configured to drive two front wheels of the vehicle 10.

[0072] As shown in (b) of Figure 2 , the vehicle 10 can include a power battery (not shown in Figure 2 ), a distributed power assembly 30, and four wheels. The distributed power assembly 30 includes a first drive motor 201, a second drive motor 203, and a motor controller 303. The first drive motor 201 and the second drive motor 203 are configured to drive two front wheels or two rear wheels, and the motor controller 303 is configured to output alternating current to the first drive motor 201 and the second drive motor 203 to drive the two drive motors.

[0073] As shown in (c) of Figure 2As shown in (c) of FIG. 1, the vehicle 10 can be a hybrid vehicle, the vehicle 10 including a power battery (not shown in the figure), a hybrid assembly 40, and four wheels. The hybrid assembly 40 includes a generator and a generator controller, and the hybrid assembly 40 can further include a drive motor 201, and the generator controller can be integrated with the motor controller as a dual motor controller. Figure 2

[0074] The power assembly in the present application can be a centralized power assembly, a hub motor power assembly, or a wheel motor power assembly. The hub motor power assembly directly sets the motor and the reducer in the wheel hub, and cancels the half shaft, the universal joint, the differential, the transmission, and other transmission components. The wheel motor power assembly sets the motor on the subframe.

[0075] The present application provides a power assembly.

[0076] As shown in (c) of FIG. 1, the vehicle 10 can be a hybrid vehicle, the vehicle 10 including a power battery (not shown in the figure), a hybrid assembly 40, and four wheels. The hybrid assembly 40 includes a generator and a generator controller, and the hybrid assembly 40 can further include a drive motor 201, and the generator controller can be integrated with the motor controller as a dual motor controller. Figure 3 The power assembly can be applied to a vehicle with at least two power components mounted on a direct current bus, such as a dual-drive vehicle 10, and can be a first power assembly 20 or a second power assembly 21 as shown in (a) of FIG. 1. Figure 2 The first power assembly 20 includes a first drive motor 201 and a first motor controller 202. The first motor controller 202 is used to connect the direct current bus through a first direct current side disconnect device, receive direct current power from the direct current bus, and output alternating current to the first drive motor 201 to drive the first drive motor 201. The direct current bus is used to receive direct current from the power battery, which can also be understood as the current output by the power battery. Since other power components are also mounted on the direct current bus, the current in the parallel branch is smaller than the total current, and therefore the current received by the direct current bus from the power battery is larger than the current passing through the first direct current side disconnect device.

[0077] As shown in (c) of FIG. 1, the vehicle 10 can be a hybrid vehicle, the vehicle 10 including a power battery (not shown in the figure), a hybrid assembly 40, and four wheels. The hybrid assembly 40 includes a generator and a generator controller, and the hybrid assembly 40 can further include a drive motor 201, and the generator controller can be integrated with the motor controller as a dual motor controller.

[0078] As shown in (c) of FIG. 1, the vehicle 10 can be a hybrid vehicle, the vehicle 10 including a power battery (not shown in the figure), a hybrid assembly 40, and four wheels. The hybrid assembly 40 includes a generator and a generator controller, and the hybrid assembly 40 can further include a drive motor 201, and the generator controller can be integrated with the motor controller as a dual motor controller. Figure 3 When the current passing through the first direct current side disconnect device is greater than a first threshold value, the first direct current side disconnect device disconnects the connection between the direct current bus and the first motor controller.

[0079]

[0080] ​​In the present application, the DC side disconnecting device can be a controlled switching device such as a switch tube, a relay, etc., or an automatic over-current fuse such as a fuse, a fuse link, etc., and the present application does not limit the same. If the DC side disconnecting device is a controlled switching device, it can be connected with a control circuit in the motor controller and controlled by the control circuit, or it can be connected with a controller in the battery management system and controlled by the battery management system.

[0081] The DC bus includes a positive DC bus and a negative DC bus, and the positive DC bus is connected with the positive electrode of the power battery, and the negative DC bus is connected with the negative electrode of the power battery. Part of the DC current output by the power battery is input to the first power assembly 20 through the first DC side disconnecting device. When a short circuit fault occurs in the first power assembly 20, the DC current passing through the first DC side disconnecting device will suddenly increase. When the current passing through the first DC side disconnecting device is greater than the first threshold value, it indicates that a short circuit occurs in the power assembly. In order to protect the electrical components, the first DC side disconnecting device is disconnected, and the connection between the first power assembly 20 and the DC bus is disconnected. Thus, the short circuit fault of the first power assembly 20 is isolated and does not affect other electrical components mounted on the DC bus.

[0082] In a possible embodiment, the first motor controller 202 includes a housing for accommodating the first DC side disconnecting device and an inverter circuit, and the housing includes a DC input port and an AC output port. The inverter circuit is connected to the DC input port through the first DC side disconnecting device and receives power from the DC bus through the DC input port. The inverter circuit is configured to output AC power through the AC output port.

[0083] The first DC side disconnecting device can be arranged in the motor controller, and the DC bus is connected to the DC side disconnecting device in the motor controller through the port of the motor controller housing. The DC side disconnecting device inputs the current received from the DC bus to the inverter circuit.

[0084] In a possible embodiment, the DC bus is configured to receive power from the power battery through the protection device. When the current received by the DC bus from the power battery is greater than a third threshold value for a second time duration, the protection device is disconnected. When the current received by the DC bus from the power battery is greater than the third threshold value and / or the current passing through the first DC side disconnecting device is greater than the first threshold value, the first DC side disconnecting device is disconnected before the protection device is disconnected.

[0085] The protection device can be a total fuse. When overcurrent occurs on the DC bus, the protection device will be fused after the second time duration, thereby protecting the power battery and the electrical components. In order to prevent the protection device from being disconnected when a single electrical component has a short circuit, thereby affecting other normal electrical components, the DC side disconnecting device is arranged to be disconnected before the protection device when overcurrent occurs.

[0086] Therefore, when selecting the first DC side disconnecting device and the protection device, it is necessary to ensure that the device opening delay time of the first DC side disconnecting device is less than the device opening delay time of the protection device.

[0087] As shown in Figure 4 The first power assembly 20 includes an AC side disconnecting device, the inverter circuit of the first motor controller 202 includes three-phase bridge arms, and the bridge arm midpoints of the three-phase bridge arms are used to connect the three-phase windings of the first drive motor 201 through the AC side disconnecting device; when the current through any one of the three-phase bridge arms is greater than a second threshold value, the AC side disconnecting device is used to disconnect the connection between the any one of the three-phase bridge arms and the windings of the drive motor.

[0088] It should be understood that the inverter circuit can include N-phase bridge arms and be connected with N-phase windings of the first drive motor 201, where N is a positive integer and greater than 2. In this application, N is taken as 3 for illustration, and when N is other values, similar manners can be referred to, which will not be described herein.

[0089] The installation position of the AC side disconnecting device is not limited in this application, and the AC side disconnecting device can be in the housing of the motor controller or be a separately added device.

[0090] The first motor controller 202 is used to control the first drive motor 201 to reduce the output torque in response to the current of any one of the three-phase bridge arms being greater than the second threshold value.

[0091] The detection device is included in each circuit in the power assembly, and the detection device is used to detect the overcurrent signal in the circuit, and the detection device sends the overcurrent signal to the motor controller, so that the motor controller can detect the overcurrent signal in each circuit. For example, the overcurrent signals at any of the overcurrent points 1-7 in the figure can be detected.

[0092] The AC side disconnecting device is a controlled disconnecting device, and the overcurrent signal detected by the detection device in the first motor controller 202 is used as a trigger source.

[0093] For example, when a transient overcurrent signal occurs at any one of the overcurrent points 5, 6 or 7, i.e., the current of any one of the three-phase bridge arms is greater than the second threshold value, the AC side disconnecting device disconnects the connection between the phase bridge arm where the overcurrent signal occurs and the drive motor, and controls the first drive motor 201 to reduce the output torque.

[0094] As can be easily understood, when a single switch tube module in a phase bridge arm is short-circuited, the current on the phase bridge arm will only appear overcurrent when the switch tube module is closed, and therefore the overcurrent signal in the motor controller will be detected to be momentarily low and then return to normal. At this time, only the AC side disconnecting device corresponding to the phase bridge arm of the module needs to be disconnected.

[0095] According to the solution of the present application, an AC side disconnect device is added to the power line between the motor controller and the drive motor to isolate the short-circuit fault on the inverter circuit. When a single module fails, the drive motor can be operated in a short-term phase loss without immediate power loss, thereby improving the safety of the vehicle.

[0096] In a possible embodiment, the first motor controller 202 is configured to control the first DC side disconnecting device to disconnect in response to the current of any one of the three-phase bridge arms being greater than the second threshold for a duration greater than the first duration.

[0097] Optionally, the first motor controller 202 is used to control the AC side disconnecting device to disconnect the connection between at least two phase arms in the three-phase bridge arms and the windings of the drive motor in response to the current of any phase arm in the three-phase bridge arm being greater than the second threshold for a duration greater than the first duration.

[0098] Exemplarily, the first duration may be less than or equal to 10 microseconds.

[0099] Since the overcurrent signal will only appear briefly when a single module fails, the duration can be less than or equal to 10 microseconds. When the overcurrent signal exceeds the first duration, it indicates that there is a short circuit in the entire circuit.

[0100] It is easy to understand that when the overcurrent signal on the motor controller remains at a low level, that is, the current is greater than the second threshold for a duration greater than the first duration, it is possible that the upper and lower bridge arm switch modules in one-phase bridge arm are short-circuited. At this time, the DC side disconnect device needs to be disconnected to avoid affecting the DC bus and causing power loss of the entire vehicle.

[0101] For example, when an overcurrent signal appears at any of overcurrent points 1-4, or when a continuous overcurrent signal appears at any of overcurrent points 5, 6, or 7, it indicates that the entire bridge arm is short-circuited or any circuit between the positive and negative ends of the mounted bus is short-circuited. In this case, the first DC-side disconnect device needs to be disconnected. The first AC-side disconnect device can be disconnected. Disconnecting the AC-side disconnect devices corresponding to at least two of the three-phase bridge arms can prevent the current in the motor controller from forming a loop, thereby isolating the fault and preventing the DC bus from being affected.

[0102] The present application provides a distributed powertrain 30 .

[0103] like Figure 5 As shown, the distributed powertrain 30 includes two drive motors: a first drive motor 201, a second drive motor 203, and a motor controller 303. The first drive motor 201 and the second drive motor 203 are respectively used to drive the two front wheels or the first drive motor 201 and the second drive motor 203 are respectively used to drive the two rear wheels.

[0104] The motor controller 303 is configured to output alternating current to the first drive motor 201 and the second drive motor 203 to drive the two drive motors.

[0105] The motor controller 303 includes a first inverter circuit 3031, a second inverter circuit 3032, a control circuit 3033, and two DC side disconnect devices.

[0106] The control circuit 3033 is configured to be connected with the two inverter circuits and control the on and off of the switching tubes in the two inverter circuits.

[0107] The DC bus is configured to receive power from the power battery, and the current received by the DC bus from the power battery is greater than the current passing through one DC side disconnect device and the current passing through the other DC side disconnect device.

[0108] The first inverter circuit 3031 is configured to receive power from the DC bus through one DC side disconnect device and output alternating current to the first drive motor 201.

[0109] The second inverter circuit 3032 is configured to receive power from the DC bus through the other DC side disconnect device and output alternating current to the second drive motor 203.

[0110] The first drive motor 201 and the second drive motor 203 are configured to drive two front wheels or two rear wheels of the vehicle 10.

[0111] When the current passing through one DC side disconnect device is greater than a first threshold value, the one DC side disconnect device disconnects the connection between the DC bus and the first inverter circuit.

[0112] When the current passing through the other DC side disconnect device is greater than the first threshold value, the other DC side disconnect device disconnects the connection between the DC bus and the second inverter circuit.

[0113] The motor controller includes two inverter circuits, respectively configured to output current to two drive motors. The two inverter circuits are respectively connected with a DC bus through two DC side disconnect devices. When a short-circuit overcurrent occurs in any one of the inverter circuits, only the corresponding DC side disconnect device can be disconnected, so that the fault can be isolated and the other normal inverter circuit can output current to the drive motor.

[0114] It should be understood that the specific type of the two DC side disconnect devices is not limited in the present application. The two protection devices can be circuit breakers, fuses, relays, etc., and the specific type can be selected according to actual implementation. Moreover, the one DC side disconnect device and the other DC side disconnect device can be of the same type or different types, which is not limited in the embodiments of the present application.

[0115] According to the scheme, for the motor controller of the distributed drive motor, the direct current bus and the inverter circuit are connected through the direct current side disconnecting device respectively, the connection between the fault inverter circuit and the direct current bus can be disconnected only, so that the normal drive motor operation is not affected, and power redundancy is realized.

[0116] In a possible implementation, the motor controller comprises a housing for accommodating the first inverter circuit, the second inverter circuit and the two direct current side disconnecting devices, the housing comprises two direct current input ports and two alternating current output ports; the first inverter circuit is connected to one direct current input port through one direct current side disconnecting device and receives direct current bus power supply through the direct current input port; the first inverter circuit is configured to output alternating current through one alternating current output port; the second inverter circuit is connected to the other direct current input port through the other direct current side disconnecting device and receives direct current bus power supply through the other direct current input port; the second inverter circuit is configured to output alternating current through the other alternating current output port.

[0117] The two inverter circuits and the two direct current side disconnecting devices can be assembled in a containing cavity formed in the housing of the motor controller.

[0118] In another possible implementation, the housing of the motor controller forms two containing cavities, and the first inverter circuit and the second inverter circuit are assembled in different containing cavities; one direct current side disconnecting device is assembled in the same containing cavity as the first inverter circuit, and the other direct current side disconnecting device is assembled in the same containing cavity as the second inverter circuit.

[0119] The bridge arm midpoints of the three-phase bridge arms of the first inverter circuit 3031 are respectively configured to be connected to the three-phase windings of the first drive motor 201 through the first alternating current side disconnecting device, and the bridge arm midpoints of the three-phase bridge arms of the second inverter circuit 3032 are respectively configured to be connected to the three-phase windings of the second drive motor 203 through the second alternating current side disconnecting device.

[0120] When the current through any one of the three-phase bridge arms of the first inverter circuit 3031 is greater than the second threshold value, the first alternating current side disconnecting device is configured to disconnect the connection between the any one of the three-phase bridge arms and the windings of the first drive motor 201, the motor controller is configured to control the remaining phase bridge arms of the first inverter circuit 3031 to output current and drive the first drive motor 201, and the output torque of the first drive motor 201 is reduced.

[0121] When the current through any one of the three-phase bridge arms of the second inverter circuit 3032 is greater than the second threshold value, the second alternating current side disconnecting device is configured to disconnect the connection between the any one of the three-phase bridge arms and the windings of the second drive motor 203, the motor controller is configured to control the remaining phase bridge arms of the second inverter circuit 3032 to output current and drive the second drive motor 203, and the output torque of the second drive motor 203 is reduced.

[0122] When a short circuit fault occurs in one of the three-phase bridge arms, the AC side disconnect device corresponding to the phase bridge arm can be disconnected, and the remaining phase bridge arms can work normally. At this time, the drive motor can operate in a short time with a missing phase, but the torque output by the drive motor at this time will be smaller than that when working normally.

[0123] The motor controller is configured to, in response to a duration for which the current of any one of the three-phase bridge arms of the first inverter circuit 3031 being greater than the second threshold value being greater than the first duration, control one DC side disconnect device to be disconnected, and control the first AC side disconnect device to disconnect the connection between at least two of the three-phase bridge arms of the first inverter circuit 3031 and the winding of the first drive motor 201; and in response to a duration for which the current of any one of the three-phase bridge arms of the second inverter circuit 3032 being greater than the second threshold value being greater than the first duration, control another DC side disconnect device to be disconnected, and control the first AC side disconnect device to disconnect the connection between at least two of the three-phase bridge arms of the second inverter circuit 3032 and the winding of the second drive motor 203.

[0124] When the overcurrent signal is continuously at a low level, a short circuit occurs in the phase bridge arm, and at this time, the inverter circuit needs to be disconnected from the bus to protect other electrical components, and the corresponding drive motor also stops outputting torque.

[0125] In some possible embodiments, when one of the inverter circuits in the distributed power assembly 30 fails, the other inverter circuit can increase the current of the three-phase alternating current output to the corresponding drive motor and the output power of the inverter circuit, thereby increasing the torque output by the drive motor and / or the output power of the drive motor, and further reducing the power loss of the distributed power assembly 30 due to the failure of the inverter circuit, and improving the safety of the distributed power assembly 30. The current is active current, which is used to increase the torque output by the drive motor, and the output power of the motor controller is active power. Taking the failure of the first inverter circuit 3031 as an example, the second inverter circuit 3032 can increase the current output to the drive motor, thereby increasing the torque output by the drive motor and / or the power of the drive motor, and further reducing the power loss of the distributed power assembly 30 due to the failure of the first inverter circuit 3031.

[0126] The application provides a vehicle 10, which can be a dual-drive electric vehicle or a hybrid vehicle, which can be a single-drive vehicle or a dual-drive vehicle.

[0127] The vehicle 10 includes a power battery, a first power assembly 20, and a second power assembly 21.

[0128] The first power assembly 20 includes a first drive motor 201 and a first motor controller 202, the first motor controller 202 is configured to connect to the DC bus through the first DC side disconnect device and receive power supply from the DC bus, and the first motor controller 202 is configured to output AC power to the first drive motor 201 to drive the first drive motor 201.

[0129] The second power assembly 21 includes a second drive motor 203 and a second motor controller 204, the second motor controller 204 is configured to connect to the DC bus through the second DC side disconnect device and receive power supply from the DC bus, and the second motor controller 204 is configured to output AC power to the second drive motor 203 to drive the second drive motor 203.

[0130] The DC bus is configured to receive power supply from the power battery, and the current received by the DC bus from the power battery is greater than the current passing through the first DC side disconnect device and the current passing through the second DC side disconnect device.

[0131] When the current passing through the first DC side disconnect device is greater than the first threshold, the first DC side disconnect device disconnects the connection between the DC bus and the first motor controller; when the current passing through the second DC side disconnect device is greater than the fourth threshold, the second DC side disconnect device disconnects the connection between the DC bus and the second motor controller.

[0132] The first threshold and the fourth threshold can be equal or not equal. Since the impedances of different circuits can be different, different thresholds can be set for different power assemblies for overcurrent protection.

[0133] The vehicle can be a dual-drive vehicle including two power assemblies, for example, a front drive power assembly and a rear drive power assembly. The specific type of power assembly is not limited in the present application. The power assembly can be a centralized power assembly, or a distributed motor power assembly or a wheel hub motor power assembly as described above.

[0134] The two power assemblies are connected to the DC bus through the DC side disconnect devices respectively, so that when a short circuit fault occurs in one of the power assemblies, the corresponding DC side disconnect device is disconnected, and the other power assembly can continue to drive the vehicle without being affected.

[0135] In a possible embodiment, the power battery includes a second housing for accommodating the first DC side disconnect device and the second DC side disconnect device, and the second housing includes two DC output ports; wherein the power battery is connected to one DC output port through the first DC side disconnect device and supplies power to the first motor controller through the one DC output port; and the power battery is connected to the other DC output port through the second DC side disconnect device and supplies power to the second motor controller through the other DC output port.

[0136] According to the scheme of the present application, the DC side disconnecting device can be located in the motor controller, and if it is a controlled switch device, it can be controlled by the motor controller in response to the fast, which is conducive to improving the safety of the vehicle. The DC side disconnecting device can also be located in the power battery, and the power battery is connected to the power assembly through a plurality of DC side disconnecting devices, which is conducive to improving the safety of the vehicle.

[0137] When the current received by the DC bus from the power battery is greater than the third threshold value, the first DC side disconnecting device is disconnected; when the current received by the DC bus from the power battery is still greater than the third threshold value after the first DC side disconnecting device is disconnected, the second DC side disconnecting device is disconnected.

[0138] According to the scheme of the present application, when overcurrent occurs on the DC bus, in order to protect the safety of the power battery and the electrical components, the DC side disconnecting device corresponding to the power assembly can be disconnected in turn until the overcurrent condition on the DC bus no longer exists, thereby improving the safety of the vehicle.

[0139] The vehicle 10 can also be a hybrid vehicle, such as a plug-in or extended-range power vehicle.

[0140] As shown in Figure 6 The first power assembly further includes a generator, and the first motor controller further includes a generator inverter circuit; the generator inverter circuit is used to receive alternating current generated by the generator and supply power to the DC bus through the third DC side disconnecting device; when the current through the third DC side disconnecting device is greater than the first threshold value, the third DC side disconnecting device disconnects the connection between the DC bus and the generator inverter circuit. The generator controller can be integrated with the motor controller as a dual-motor controller.

[0141] In another possible embodiment, the second power assembly further includes a generator, and the second motor controller further includes a generator inverter circuit; the generator inverter circuit is used to receive alternating current generated by the generator and supply power to the DC bus through the third DC side disconnecting device; when the current through the third DC side disconnecting device is greater than the first threshold value, the third DC side disconnecting device disconnects the connection between the DC bus and the generator inverter circuit.

[0142] In a possible embodiment, the generator controller can also be connected to the generator through a third AC side disconnecting device. The specific connection mode and description can be referred to the description of the AC side disconnecting device in the foregoing, which will not be described here.

[0143] For a hybrid vehicle, a hybrid power assembly 40 can be used, and fault isolation can be performed through the DC side disconnecting device and the AC side disconnecting device. When the hybrid power assembly 40 fails, disconnecting the DC side disconnecting device can ensure that other power assemblies on the DC bus are not affected and work normally.

[0144] According to the scheme of the application, by adding the DC side disconnecting device in front of each high-voltage electrical component inputted with the DC bus, when a short circuit fault occurs in one load, only the DC side disconnecting device in front of the corresponding electrical component is disconnected, the fault is isolated, and the normal work of other electrical components can be ensured, thereby effectively improving the safety of the vehicle. By adding the AC side disconnecting device in front of the driving motor, when a single component fails, the motor can run in open-phase mode for a short time, and power redundancy is realized.

[0145] In the embodiments of the present application, the words such as "example", "for example" are used to represent an example, illustration or description. Any embodiment or design scheme described as "example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the word "example" is intended to present the concept in a specific manner.

[0146] It should be understood that the "embodiments" mentioned throughout the specification mean that the specific features, structures or characteristics related to the embodiments are included in at least one embodiment of the present application. Therefore, the various embodiments throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0147] It should also be understood that in the present application, "when", "if", "in the case of" and "if" all refer to the corresponding processing under certain objective conditions, not the time limit, and do not require the equipment to have a judgment action when implemented, nor does it mean that there are other limitations. In addition, in the present application, the description of the above-mentioned "when", "if", "in the case of" and "if" conditions can be understood as necessary conditions, and whether the condition is a sufficient condition or a sufficient and necessary condition is not limited. For example, "performing B in the case of A" can be understood as "performing B in the case of at least satisfying A".

[0148] In addition, in each embodiment of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that the determination of B according to A does not mean that B is determined only according to A, but B can also be determined according to A and / or other information.

[0149] “At least one” means one or more, “multiple” means two or more. “And / or” describes the association relationship of associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character “ / ” generally represents an “or” relationship between the associated objects before and after it. “At least one of the following” or similar expressions means any combination of these items, including any combination of single or multiple items. For example, “at least one of A, B or C” includes A, B, C, AB, AC, BC or ABC, and “at least one of A, B and C” can also be understood to include A, B, C, AB, AC, BC or ABC. In addition, unless otherwise specified, the ordinal numbers “first”, “second” and the like mentioned in the embodiments of the present application are used to distinguish a plurality of objects, and are not used to limit the order, time sequence, priority or importance of the plurality of objects.

[0150] In several embodiments provided in the present application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed objects can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0151] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A powertrain, characterized by, The power assembly comprises a drive motor and a motor controller; wherein The motor controller is configured to receive power from a DC bus through a first DC side disconnection device and output AC power to the drive motor to drive the drive motor, the DC bus receives power from a power battery, and a current size received by the DC bus from the power battery is greater than a current size passing through the first DC side disconnection device; When the current size passing through the first DC side disconnection device is greater than a first threshold value, the first DC side disconnection device disconnects the connection between the DC bus and the motor controller; The inverter circuit of the motor controller comprises a three-phase bridge arm, and a bridge arm midpoint of the three-phase bridge arm is configured to connect a three-phase winding of the drive motor through an AC side disconnection device; When a current passing through any one phase bridge arm of the three-phase bridge arm is greater than a second threshold value, the AC side disconnection device is configured to disconnect the connection between the any one phase bridge arm and the winding of the drive motor; The motor controller is configured to: In response to a duration that the current of any one phase bridge arm of the three-phase bridge arm is greater than the second threshold value being greater than a first duration, control the first DC side disconnection device to disconnect.

2. The powertrain of claim 1, wherein, The motor controller comprises a housing configured to accommodate the first DC side disconnection device and the inverter circuit, and the housing comprises a DC input port and an AC output port; wherein The inverter circuit connects the DC input port through the first DC side disconnection device and receives power from the DC bus through the DC input port; The inverter circuit is configured to output the AC power through the AC output port.

3. The powertrain of claim 1, wherein, The motor controller is configured to: In response to the current of any one phase bridge arm of the three-phase bridge arm being greater than the second threshold value, control the drive motor to reduce output torque.

4. The powertrain of claim 1, wherein, The motor controller is configured to: In response to a duration that the current of any one phase bridge arm of the three-phase bridge arm is greater than the second threshold value being greater than a first duration, control the AC side disconnection device to disconnect the connection between at least two phase bridge arms of the three-phase bridge arm and the winding of the drive motor.

5. The powertrain of any one of claims 1-4, wherein, The first duration is less than or equal to 10 microseconds.

6. The powertrain of any one of claims 1-4, wherein, The DC bus is configured to receive power from the power battery through a protection device, and the protection device is configured to disconnect when a current size received by the DC bus from the power battery is greater than a third threshold value for a second duration; When the current size received by the DC bus from the power battery is greater than the third threshold value and / or the current size passing through the first DC side disconnection device is greater than the first threshold value, the first DC side disconnection device disconnects before the protection device disconnects.

7. The powertrain of any one of claims 1-4, wherein, The power assembly further comprises a generator, and the motor controller further comprises a generator inverter circuit; The generator inverter circuit is configured to receive AC power generated by the generator and supply power to the DC bus through a third DC side disconnection device; When the current size passing through the third DC side disconnection device is greater than a first threshold value, the third DC side disconnection device disconnects the connection between the DC bus and the generator inverter circuit.

8. A distributed powertrain, characterized in that: The distributed power assembly comprises a motor controller, two drive motors and two DC side disconnects, and is configured to drive two front wheels or two rear wheels of a vehicle; The motor controller comprises a first inverter circuit and a second inverter circuit, the first inverter circuit is configured to receive power from a DC bus through one DC side disconnect and output AC power to one drive motor, and the second inverter circuit is configured to receive power from the DC bus through the other DC side disconnect and output AC power to the other drive motor; The DC bus is configured to receive power from a power battery, and the current received by the DC bus from the power battery is greater than the current passing through the one DC side disconnect and the current passing through the other DC side disconnect; When the current passing through the one DC side disconnect is greater than a first threshold, the one DC side disconnect disconnects the connection between the DC bus and the first inverter circuit; When the current passing through the other DC side disconnect is greater than the first threshold, the other DC side disconnect disconnects the connection between the DC bus and the second inverter circuit; The bridge arm midpoint of the three-phase bridge arm of the first inverter circuit is configured to connect the three-phase winding of one drive motor through a first AC side disconnect, and the bridge arm midpoint of the three-phase bridge arm of the second inverter circuit is configured to connect the three-phase winding of the other drive motor through a second AC side disconnect; When the current passing through any one phase bridge arm of the three-phase bridge arm of the first inverter circuit is greater than a second threshold, the first AC side disconnect is configured to disconnect the connection between the any one phase bridge arm and the winding of the one drive motor, and the motor controller is configured to control the remaining phase bridge arms of the first inverter circuit to output current and drive the one drive motor, and the output torque of the one drive motor is reduced; When the current passing through any one phase bridge arm of the three-phase bridge arm of the second inverter circuit is greater than the second threshold, the second AC side disconnect is configured to disconnect the connection between the any one phase bridge arm and the winding of the other drive motor, and the motor controller is configured to control the remaining phase bridge arms of the second inverter circuit to output current and drive the other drive motor, and the output torque of the other drive motor is reduced; The motor controller is configured to: In response to the duration that the current passing through any one phase bridge arm of the three-phase bridge arm of the first inverter circuit is greater than the second threshold being greater than a first duration, control the one DC side disconnect to be disconnected, and control the first AC side disconnect to disconnect the connection between at least two phase bridge arms of the three-phase bridge arm of the first inverter circuit and the winding of the one drive motor; In response to the duration that the current passing through any one phase bridge arm of the three-phase bridge arm of the second inverter circuit is greater than the second threshold being greater than the first duration, control the other DC side disconnect to be disconnected, and control the first AC side disconnect to disconnect the connection between at least two phase bridge arms of the three-phase bridge arm of the second inverter circuit and the winding of the other drive motor.

9. The powertrain of claim 8, wherein, The motor controller comprises a housing for accommodating the first inverter circuit, the second inverter circuit and two DC side disconnect devices, the housing comprising two DC input ports and two AC output ports; wherein, the first inverter circuit is connected to one of the DC input ports by one of the DC side disconnect devices and receives the DC bus power supply through the one DC input port; the first inverter circuit is configured to output AC power through one of the AC output ports; the second inverter circuit is connected to the other of the DC input ports by the other of the DC side disconnect devices and receives the DC bus power supply through the other DC input port; the second inverter circuit is configured to output AC power through the other of the AC output ports.

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