Motor control unit having short-circuit isolation function, power assembly, and electric vehicle

Abstract

The embodiments disclosed in the present application belong to the field of new energy vehicles, and particularly relate to a motor control unit having a short-circuit isolation function, a power assembly, and an electric vehicle. The motor control unit comprises an inverter circuit and a control circuit, wherein the inverter circuit comprises three-phase bridge arms, each phase bridge arm comprises an upper bridge arm switch tube and a lower bridge arm switch tube, and the bridge arm midpoint of each phase bridge arm is configured to connect to one-phase winding of a driving motor by means of one switch module; the control circuit is used for controlling the switch module corresponding to each phase bridge arm to turn on, and controlling the bridge arm midpoint of each phase bridge arm to output a current to one-phase winding of the driving motor; and during the process of the inverter circuit outputting a current, and in response to the upper bridge arm switch tube or lower bridge arm switch tube of at least one phase bridge arm short-circuiting, the control circuit controls the switch module corresponding to the at least one phase bridge arm to turn off. By means of the present application, after a short-circuit fault occurs in any phase bridge arm in a motor control unit, a driving motor can be continuously controlled to output a torque, and thus driving safety can be improved.

Description

Motor controller, powertrain and electric vehicle with short-circuit isolation function

[0001] This application claims priority to Chinese patent application No. 202410118779.0 filed on January 26, 2024, entitled “Motor controller, powertrain and electric vehicle with short-circuit isolation function,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of new energy vehicles, and in particular to a motor controller, a powertrain, and an electric vehicle with a short-circuit isolation function. Background Art

[0003] The Motor Control Unit (MCU) is a component used to control the motor in new energy vehicles. The motor controller is also connected to the power battery and can convert the DC power provided by the power battery into the AC power required to drive the motor.

[0004] The motor controller is generally equipped with an inverter with a three-phase full-bridge topology. By controlling the on and off of the switching tube on each bridge arm of the inverter, direct current can be converted into alternating current.

[0005] In some special cases (such as when the temperature of the switch tube is too high), the switch tube on the bridge arm may short-circuit. In this case, to avoid damaging the drive motor, it is necessary to control the motor controller to put the drive motor into a safety protection state and stop supplying power to the motor. However, this will also cause the vehicle to lose power, affecting driving safety.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a motor controller, a powertrain, and an electric vehicle with a short-circuit isolation function, which can improve the driving safety of the vehicle. The corresponding technical solutions are as follows:

[0008] In a first aspect, a motor controller with a fault isolation function is provided, the motor controller including an inverter circuit and a control circuit, wherein:

[0009] The inverter circuit includes a three-phase bridge arm, each phase bridge arm includes an upper bridge arm switching tube and a lower bridge arm switching tube, and the bridge arm midpoint of each phase bridge arm is used to connect a phase winding of the drive motor through a switch module.

[0010] The control circuit is used to control the switching module corresponding to each phase bridge arm to close, and control the midpoint of the three-phase bridge arm to output three-phase current to the three-phase winding of the drive motor.

[0011] During the process of the inverter circuit outputting three-phase current, the control circuit responds to the short circuit of the upper arm switch tube or the lower arm switch tube of at least one phase bridge arm, and the control circuit is specifically used to control the switch module corresponding to the at least one phase bridge arm to disconnect.

[0012] In the solution described in this application, when the upper or lower arm switch of one of the three-phase bridge arms short-circuits, the control circuit can disconnect the switch module between the midpoint of the bridge arm of that phase and the drive motor winding. This prevents the short-circuited three-phase current in that phase from flowing into the drive motor winding, protecting the drive motor. The midpoints of the remaining two phase bridge arms can still normally output two-phase AC power to the drive motor winding, allowing the drive motor to operate in a phase-missing state. This prevents the vehicle from completely losing power and improves the vehicle's driving safety and operational reliability.

[0013] In one feasible embodiment, the motor controller includes three drive circuits, each drive circuit is used to drive the upper arm switch tube and the lower arm switch tube of one phase bridge arm in the three-phase bridge arm, each drive circuit is used to receive power from a power supply, and different drive circuits are used to receive power from different power supplies.

[0014] In the solution presented in this application, the drive current for the three-phase bridge arm of the inverter circuit is supplied separately by three power supplies. This way, if any bridge arm short-circuits, causing the corresponding power supply to short-circuit, the other two power supplies can still normally supply power to the remaining two bridge arms that are not short-circuited. This allows the remaining two bridge arms to be properly controlled to provide two-phase AC power to the drive motor, thereby ensuring the rotation of the drive motor and improving vehicle driving safety.

[0015] In one feasible manner, during the process of the inverter circuit outputting three-phase current, the control circuit responds to the short circuit of the upper bridge arm switch tube or the lower bridge arm switch of at least one phase bridge arm, and the control circuit is used to control the power supply corresponding to at least one phase bridge arm to stop supplying power.

[0016] In the solution shown in the present application, after a switch tube of a phase bridge arm in the inverter circuit is short-circuited, the control circuit stops supplying power to the phase bridge arm by controlling the switch tube that is not short-circuited, thereby preventing the switch tube that is not short-circuited from forming a path with the short-circuited switch tube when it is turned on, thereby avoiding short-circuiting the drive motor and improving the driving safety of the vehicle.

[0017] In one feasible manner, during the process of the inverter circuit outputting three-phase current, the control circuit responds to the short circuit of the upper arm switch tube or the lower arm switch tube of at least one phase bridge arm, and the control circuit is used to output a shutdown signal, and the shutdown signal is used to control the upper arm switch tube and the lower arm switch tube of at least one phase bridge arm to shut down.

[0018] In the solution shown in the present application, after a switch tube of a phase bridge arm in the inverter circuit is short-circuited, the control circuit outputs a shutdown signal to the switch tube of the phase bridge arm, so that the non-short-circuited switch tube is turned off. This can avoid the non-short-circuited switch tube from forming a path with the short-circuited switch tube when it is turned on, thereby avoiding short-circuiting the drive motor and improving the driving safety of the vehicle.

[0019] In one feasible manner, when the inverter circuit is used to output three-phase current, the control circuit is used to: first control the upper bridge arm switch tube or the lower bridge arm switch tube that is not short-circuited in at least one phase bridge arm to disconnect, and then control the corresponding switch module of at least one phase bridge arm to disconnect.

[0020] In the solution described in this application, when a switch in a phase arm of the inverter circuit short-circuits, the control circuit can first shut down the remaining switches in that phase arm to prevent both the upper and lower switches in that phase arm from being turned on, which could short-circuit the drive motor. The corresponding switch module in at least one phase arm is then controlled to disconnect, preventing the short-circuited three-phase current in that phase arm from flowing into the drive motor windings, thereby protecting the drive motor.

[0021] In one feasible manner, when the inverter circuit is used to output the three-phase current, the control circuit responds to the current of the upper arm switch tube or the lower arm switch tube of at least one phase bridge arm of the three-phase bridge arm being greater than the current threshold, and the control circuit is specifically used to control the switch module corresponding to at least one phase bridge arm to disconnect.

[0022] In the scheme shown in the present application, the control circuit can determine that the three-phase current of the upper bridge arm switch tube or the lower bridge arm switch tube of at least one phase bridge arm is short-circuited after detecting that the three-phase current of the upper bridge arm switch tube or the lower bridge arm switch tube of at least one phase bridge arm is greater than the current threshold, and then control the switch module corresponding to at least one phase bridge arm to disconnect, so as to avoid the short-circuited three-phase current of the phase bridge arm from flowing to the winding of the drive motor, which can protect the drive motor.

[0023] In one feasible manner, during the process of the inverter circuit outputting three-phase current, the control circuit responds to the current of the upper bridge arm switch tube or the lower bridge arm switch tube of at least one phase bridge arm being greater than the current threshold, and the control circuit is specifically used to control the inverter circuit to be in a safety protection state.

[0024] After the control circuit controls the inverter circuit to be in a safety protection state for a preset period of time in response to the control circuit, the control circuit is specifically used to control the upper arm switch tube and the lower arm switch tube of the three-phase bridge arm to be turned off.

[0025] In response to the current through the upper bridge arm switch tube or the lower bridge arm switch tube of at least one phase bridge arm being greater than zero, the control circuit is specifically used to control the switch module corresponding to at least one phase bridge arm to be disconnected.

[0026] The safety protection state includes the active short circuit ASC state or the full shutdown SPO state.

[0027] In the solution shown in the present application, after determining that the current of the upper bridge arm switch tube or the lower bridge arm switch tube of at least one phase bridge arm is greater than the current threshold, the control circuit can further verify whether the upper bridge arm switch tube or the lower bridge arm switch tube of at least one phase bridge arm is short-circuited. Before verification, the drive motor is controlled to enter the safety protection state for a preset time, which can reduce the back electromotive force generated by the drive motor to protect the components in the inverter circuit. After turning off the upper bridge arm switch tube and the lower bridge arm switch tube in the three-phase bridge arm, if there is a three-phase current at the midpoint of at least one phase bridge arm that is greater than zero or greater than the current threshold, it can be determined that the upper bridge arm switch tube or the lower bridge arm switch tube of the at least one phase bridge arm is short-circuited, and then the switch module corresponding to the at least one phase bridge arm can be disconnected to prevent the short-circuited three-phase current of the phase bridge arm from flowing to the winding of the drive motor, which can protect the drive motor.

[0028] The safety protection states include the active short circuit (ASC) state and the switching pulse off (SPO) state. The active short circuit (ASC) state refers to the state where all upper bridge arm switches of each phase arm of the three-phase bridge arm are turned on or all lower bridge arm switches are turned on, and the three-phase winding of the drive motor and the three upper bridge arm switches or three lower bridge arm switches in the turned-on state and the three-phase winding form a closed loop. When the motor controller enters the active short circuit protection (ASC) state, it can isolate the motor controller, the drive motor, and the power battery to ensure the high voltage safety of the entire vehicle. It can also enable the drive motor to generate reverse torque to slowly brake the vehicle. At the same time, when the motor controller enters the active short circuit (ASC) state, it can prevent the drive motor from generating excessive back electromotive force that may damage the power battery, bus capacitors, and other components.

[0029] The fully off SPO state means that the upper and lower arm switching tubes of each phase of the three-phase bridge arm are all turned off, thereby isolating the motor controller, the drive motor and the power battery.

[0030] In one feasible manner, during the process of the inverter circuit outputting the three-phase current, the control circuit is specifically used to: in response to the three-phase current of the upper bridge arm switch tube or the lower bridge arm switch tube of at least one phase bridge arm of the three-phase bridge arm being greater than the current threshold and the speed of the drive motor being greater than the preset speed, control the drive motor to enter a safety protection state.

[0031] In the scheme shown in the present application, before the control circuit re-verifies whether there is a short circuit in the upper arm switch tube or the lower arm switch tube of at least one phase bridge arm, if the speed of the drive motor is greater than the preset speed, it is necessary to control the inverter circuit to be in a safety protection state to reduce the back electromotive force generated by the drive motor and protect the components in the inverter circuit.

[0032] In one practicable embodiment, a motor controller is configured to receive a torque signal and control the drive motor to output the torque indicated by the torque signal. During the process of the inverter circuit outputting a three-phase current, the control circuit is specifically configured to: in response to a short circuit in an upper or lower bridge arm switch tube of one of the three-phase bridge arms, control the switch module corresponding to at least one of the three-phase bridge arms to disconnect. In response to the disconnection of the switch module corresponding to the phase bridge arm, control the midpoints of the other two phase bridge arms to output two-phase alternating current, the two-phase alternating current being used to drive the drive motor to output torque, the average value of the torque output by the drive motor driven by the two-phase alternating current being less than the torque value indicated by the torque signal.

[0033] In the solution described in this application, the control circuit can control the remaining two bridge arms that have not experienced a short-circuit fault to output two-phase AC power to the windings of the drive motor. This output two-phase AC power can drive the vehicle's drive motor to output torque, ensuring that the vehicle does not lose power. However, switching from three-phase AC power to two-phase AC power for the vehicle's drive motor will prevent one phase of the drive motor from generating torque normally. Therefore, after the motor controller experiences a short-circuit fault in the bridge arm, the average torque output by the motor controller driving the drive motor may be less than the torque value indicated by the torque signal.

[0034] In one achievable manner, when the inverter circuit is used to output two-phase alternating current, the motor controller is used to control the rotational speed of the drive motor to be less than a preset rotational speed value.

[0035] In the solution described in this application, to improve the safety of the motor controller driving the vehicle's drive motor to output torque using two-phase AC power, the speed can be controlled to be less than a preset speed value. The preset speed value can be set by a technician based on the performance of the drive motor. When the drive motor speed is less than the preset speed value, it can safely output torque to the vehicle under the two-phase AC power.

[0036] In one feasible manner, during the process of the inverter circuit outputting two-phase alternating current, the control circuit responds to the short circuit of the upper arm switch tube or the lower arm switch tube of any bridge arm of the two-phase bridge arm, and the control circuit is used to control the drive motor to enter a safety protection state.

[0037] In the solution shown in this application, during the process of the inverter circuit outputting two-phase AC power to the drive motor, if a short circuit fault occurs again in the two-phase bridge arm that outputs the two-phase AC power, the drive motor can be controlled to enter a safety protection state to ensure driving safety.

[0038] In one feasible manner, during the process of the inverter circuit outputting two-phase alternating current, the control circuit is used to: in response to the three-phase current of the upper bridge arm switch tube or the lower bridge arm switch tube of one phase bridge arm in the two-phase bridge arm being greater than the current threshold, control the switch module corresponding to one phase bridge arm in the two-phase bridge arm to disconnect.

[0039] In the solution described in this application, when the inverter circuit is outputting two-phase AC power to the drive motor, if a short-circuit fault occurs in one of the two bridge arms outputting the two-phase AC power, the switch module connected to the bridge arm with the short-circuit fault can be controlled to disconnect. This prevents the short-circuited three-phase current in that bridge arm from flowing into the drive motor windings, thus protecting the drive motor.

[0040] In a second aspect, a powertrain is provided, which includes a drive motor and a motor controller as described in the first aspect and / or any achievable method of the first aspect, wherein the motor controller is used to receive a torque signal and control the drive motor to output the torque indicated by the torque signal.

[0041] In one possible embodiment, the powertrain includes a resolver sensor and a current sensor, the resolver sensor is used to detect the rotational speed of the drive motor, the current sensor is used to detect the three-phase current value of the drive motor, and the motor controller is used to receive the rotational speed signal from the resolver sensor and the three-phase current signal from the current sensor, the rotational speed signal is used to indicate the rotational speed of the drive motor, and the three-phase current signal is used to indicate the three-phase current value of the drive motor.

[0042] The beneficial effects of the powertrain provided in the second aspect of the application are as described in the beneficial effects of the motor controller provided in the first aspect of the application, and will not be repeated here.

[0043] In a third aspect, an electric vehicle is provided, which includes the powertrain, a vehicle controller and a power battery as described in the second aspect above, wherein the power battery is used to supply power to the powertrain, and the vehicle controller is used to send a torque signal to the motor controller.

[0044] The beneficial effects of the electric vehicle provided in the third aspect of the application are as described in the beneficial effects of the motor controller provided in the first aspect of the application, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] FIG1 is a schematic structural diagram of a motor controller provided in an embodiment of the present application;

[0046] FIG2 is a schematic structural diagram of a motor controller provided in an embodiment of the present application;

[0047] FIG3 is a schematic structural diagram of a motor controller provided in an embodiment of the present application;

[0048] FIG4 is a schematic structural diagram of a powertrain provided in an embodiment of the present application;

[0049] FIG5 is a schematic structural diagram of an electric vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0051] The motor control unit (MCU) is a component in new energy vehicles that controls the drive motor. It also connects to the power battery and converts the DC power provided by the battery into the AC power required to drive the motor. The motor controller typically incorporates an inverter with a three-phase full-bridge topology. This DC power conversion is achieved by controlling the on / off switching of each bridge arm of the inverter.

[0052] In some special cases (such as when the switch tube temperature is too high), the switch tube on the bridge arm may short-circuit. In this case, to avoid damaging the drive motor, it is necessary to control the motor controller to immediately enter the safety protection state and stop supplying power to the motor. However, this will also cause the vehicle to lose power, affecting driving safety.

[0053] The present invention provides a motor controller with fault isolation capabilities. If a short-circuit occurs in a switch in any phase arm of an inverter, the controller disconnects that phase arm from outputting AC power to the windings of the drive motor. The controller then outputs two-phase AC power to the windings of the drive motor through the remaining two phase arms to drive the motor. This ensures that the vehicle does not lose power even if a short-circuit occurs in a switch in any phase arm of the inverter, thereby ensuring safe operation.

[0054] FIG1 is a schematic diagram of the structure of a motor controller 01 with a fault isolation function provided by an embodiment of the present application. As shown in FIG1 , the motor controller 01 includes an inverter circuit 1 and a control circuit 2 .

[0055] The inverter circuit 1 includes a three-phase bridge arm 11, each phase bridge arm 11 including an upper bridge arm switch tube 111 and a lower bridge arm switch tube 112. The bridge arm midpoint 113 of each phase bridge arm 11 is used to connect to a phase winding of the drive motor 02 through a switch module 114. The upper bridge arm switch tube 111 and the lower bridge arm switch tube 112 of each phase bridge arm 11, as well as the control end of the switch module 114, can all be electrically connected to the control circuit 2. The control circuit 2 can control the closing and closing of each upper bridge arm switch tube 111, each lower bridge arm switch tube 112, and each switch module 114.

[0056] Under normal operating conditions of the motor controller 01, that is, when there is no short-circuited switch tube in the inverter circuit 1, the control circuit 2 is used to control the closure of the switch module 114 corresponding to each phase bridge arm 11, and control the bridge arm midpoint 113 of the three-phase bridge arm 11 to output three-phase current to the three-phase winding of the drive motor 02, so that the drive motor 02 rotates normally.

[0057] During the process of the inverter circuit 1 normally outputting three-phase current to the drive motor 02, the control circuit 2 is specifically used to control the switch module 114 corresponding to at least one phase bridge arm 11 to disconnect in response to the short circuit of the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of at least one phase bridge arm 11 of the three-phase bridge arm 11.

[0058] In this way, when the upper arm switch tube 111 or the lower arm switch tube 112 of one phase bridge arm 11 in the three-phase bridge arm 11 is short-circuited, the control circuit 2 can control the switch module 114 between the bridge arm midpoint 113 of the phase bridge arm 11 and the drive motor 02 to disconnect. The short-circuit current of the phase bridge arm 11 will not flow to the winding of the drive motor 02, which can protect the drive motor 02. The bridge arm midpoint 113 of the remaining two phase bridge arms 11 can continue to output two-phase AC power to the winding of the drive motor 02, so that the drive motor 02 runs in a missing phase, thereby preventing the vehicle equipped with the motor controller 01 from completely losing power, thereby improving the driving safety of the vehicle.

[0059] In the motor controller 01 shown in the present application, the upper bridge arm switch tube 111, the lower bridge arm switch tube 112 and the switch module 114 can be semiconductor devices, for example, an insulated gate bipolar transistor (IGBT), silicon carbide (SiC), etc. Each phase bridge arm 11 can be divided into an upper bridge arm and a lower bridge arm through the bridge arm midpoint 113. The upper bridge arm and the lower bridge arm both include power modules. The power module located in the upper bridge arm includes the upper bridge arm switch tube 111, and the power module located in the lower bridge arm includes the lower bridge arm switch tube 112. In addition to the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112, the power module can also include a detection module (not shown in Figure 1), such as a temperature detection module, a short circuit detection module, etc.

[0060] The short-circuit detection module in each power module can be connected in series with the upper-arm switch tube 111 or the lower-arm switch tube 112 of the same power module, and can detect the current value of the current passing through the upper-arm switch tube 111 or the lower-arm switch tube 112. When the short-circuit detection module detects that the current passing through the upper-arm switch tube 111 or the lower-arm switch tube 112 is greater than a set current threshold, it can send a fault signal to the control circuit.

[0061] In one example, the control circuit 1 controls the switch module 114 corresponding to at least one phase bridge arm 11 to disconnect in response to a current through the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of at least one phase bridge arm 11 of the three-phase bridge arm 11 being greater than a current threshold. In other words, after receiving a fault signal sent by the short-circuit detection module in any power module, the control circuit 1 can determine that a short circuit has occurred in the switch tube in the any power module, and then control the switch module 114 connected to the bridge arm 11 where the any power module is located to disconnect, so that the midpoints of the remaining two phase bridge arms 11 continue to output two-phase AC power to the windings of the drive motor 02.

[0062] In one example, during the process of the three-phase bridge arm 11 of the inverter circuit 1 normally outputting three-phase current to the drive circuit, if the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of at least one phase bridge arm 11 of the three-phase bridge arm 11 is short-circuited, the control circuit 2 is used to first control the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 that is not short-circuited in at least one phase bridge arm 11 to disconnect, and then control the corresponding switch module 114 of at least one phase bridge arm 11 to disconnect.

[0063] In practice, after a short-circuit occurs in a switch tube of a phase bridge arm 11 in the inverter circuit 1, the control circuit 2 can first turn off the non-short-circuited switch tube in the phase bridge arm 11 to prevent both the upper and lower bridge arm switches of the phase bridge arm 11 from being turned on, thereby preventing the input DC power of the inverter circuit 1 from flowing through the phase bridge arm 11, thereby preventing the drive motor 02 from losing power. After turning off the non-short-circuited switch tube in the phase bridge arm 11, the control circuit 2 can then control the corresponding switch module of at least one phase bridge arm to be disconnected, thereby preventing the short-circuit current of the phase bridge arm from flowing to the winding of the drive motor 02, thereby protecting the drive motor 02.

[0064] FIG2 is a schematic diagram of the structure of a motor controller 01 with fault isolation function provided by an embodiment of the present application. As shown in FIG2 , the motor controller 01 includes three power supplies. The upper bridge arm switch tube 111 and the lower bridge arm switch tube 112 included in the three-phase bridge arm 11 of the inverter circuit 1 can be driven by three drive circuits 3, respectively, and the three drive circuits 3 can be powered by three power supplies. The three power supplies can be three independent power supplies or three power supplies implemented by isolated power supplies.

[0065] Among them, each driving circuit 3 can be electrically connected to the two power modules on a bridge arm 11 respectively, and can be used to drive the upper bridge arm switch tube 111 and the lower bridge arm switch tube 112 included in the power module, that is, to provide the switch tube in the power module with the voltage difference required for conduction. In addition, the driving circuit 3 can also be electrically connected to the detection module in the corresponding power module, and can be used to receive the signal sent by the detection module, such as receiving the detection signal sampled by the temperature detection module, receiving the fault signal sent by the short circuit detection module, etc. Among them, the power supply of each driving circuit 3 is independent of each other, for example, each driving circuit 3 can be isolated and powered by an isolated power supply. That is to say, when an abnormality occurs in one driving circuit 3 in the motor controller 01 (such as being short-circuited), it will not affect the driving and control of the switch tubes on other phase bridge arms 11 by other driving circuits 3.

[0066] In the motor controller 01 shown in FIG2 , since the upper-arm switch tube 111 and the lower-arm switch tube 112 of a phase bridge arm receive power from a single power supply, when a short circuit occurs in the upper-arm switch tube 111 or the lower-arm switch tube 112 of a phase bridge arm, the short-circuited switch tube can short-circuit the power supply that powers it. After the power supply is short-circuited, it cannot normally supply power to the corresponding drive circuit 3, thereby causing the drive circuit to be unable to drive the other unshorted switch tube to close. In other words, when the upper-arm switch tube 111 or the lower-arm switch tube 112 of a phase bridge arm is short-circuited, the other unshorted lower-arm switch tube 112 or the upper-arm switch tube 111 can enter a shut-off state, thereby preventing the DC power input to the inverter circuit 1 from flowing directly through the phase bridge arm 11, thereby preventing the drive motor 02 from losing power.

[0067] FIG3 is a schematic diagram of the structure of a motor controller 01 with a fault isolation function provided in an embodiment of the present application. As shown in FIG3 , the upper arm switch tube 111 included in each phase bridge arm 11 of the inverter circuit 1 can be driven by the upper arm drive circuit 31, and the lower arm switch tube 112 included in each phase bridge arm 11 can be driven by the lower arm drive circuit 32. The six drive circuits can be powered by six power supplies respectively (not shown in FIG3 ). The six power supplies can be six independent power supplies or six power supplies implemented by isolated power supplies.

[0068] In the motor controller 01 shown in Figure 3, since the upper arm switch tube 111 and the lower arm switch tube 112 of each phase bridge arm receive power from a power supply respectively, after the upper arm switch tube 111 or the lower arm switch tube 112 in a phase bridge arm is short-circuited, the short-circuited switch tube will not affect the drive and control of the non-short-circuited switch tube in the same phase bridge arm 11.

[0069] Therefore, the process of the control circuit 2 controlling the non-short-circuited switch tubes in the bridge arm 11 having a short-circuit fault to turn off can include: in response to the short circuit of the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of at least one phase bridge arm 11, the control circuit 2 outputs a shutdown signal to the upper bridge arm drive circuit 31 and the lower bridge arm drive circuit 32 corresponding to the upper bridge arm switch tube 111 and the lower bridge arm switch tube 112 of the phase bridge arm, respectively. After receiving the shutdown signal, the upper bridge arm drive circuit 31 and the lower bridge arm drive circuit 32 can drive the corresponding upper bridge arm switch tube 111 and the lower bridge arm switch tube 112 to turn off. Since one of the upper bridge arm switch tube 111 and the lower arm switch tube 112 is short-circuited and cannot be turned off normally, the non-short-circuited switch tube can be turned off.

[0070] In one implementation, for the motor controller 01 shown in FIG2 and FIG3 , the process of the control circuit 2 controlling the non-short-circuited switch tubes in the bridge arm 11 having a short-circuit fault to disconnect may include: the control circuit 2 controls the power supply corresponding to at least one phase bridge arm 11 to stop supplying power in response to the short-circuit of the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of at least one phase bridge arm 11. That is, when the control circuit 2 receives a fault signal sent by the short-circuit detection module in a phase bridge arm 11, it can control the power supplies of the phase bridge arm 11 to stop supplying power to the drive circuit 3 (or the upper bridge arm drive circuit 31 and the lower bridge arm drive circuit 32) corresponding to the phase bridge arm 11, and further control the non-short-circuited upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 in the phase bridge arm 11 to disconnect.

[0071] In order to improve the accuracy of detecting a short circuit of the switch tube in the bridge arm 11, the embodiment of the present application further provides a method for determining a bridge arm abnormality, including:

[0072] In step S1 , the control circuit 2 controls the drive motor 02 to enter a safety protection state in response to the current through the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of at least one phase bridge arm 11 of the three-phase bridge arm 11 being greater than a current threshold.

[0073] Among them, the current of the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of at least one phase bridge arm 11 of the three-phase bridge arm 11 is greater than the current threshold, which can trigger the short-circuit detection module in the corresponding power module to send a fault signal to the control circuit 2. In order to avoid the fault signal being a false alarm, the accuracy of the control circuit 2 in determining whether a short circuit fault occurs in at least one phase bridge arm 11 is improved. The control circuit 2 can verify whether there is a short circuit in the inverter circuit 1 again. That is, the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of each phase bridge arm 11 in the inverter circuit 1 can be turned off. If the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of one phase bridge arm 11 is short-circuited, a current can be detected flowing at the bridge arm midpoint 113 of the phase bridge arm 11, or a current greater than the current threshold can be detected.

[0074] When the speed of drive motor 02 is high, it generates a back electromotive force (EMF) greater than the corresponding input voltage of inverter circuit 1. If the switches in inverter circuit 1 are directly turned off at this time, the back electromotive force generated by drive motor 02 will be applied to inverter circuit 1, potentially damaging some components of motor controller 01. Therefore, before turning off the switches in inverter circuit 1, control circuit 2 first controls the state of each phase bridge arm 11 in inverter circuit 1 to put drive motor 02 into a safety protection state. When the speed of drive motor 02 decreases to a point where the back electromotive force it generates is less than the corresponding input voltage of inverter circuit 1, control circuit 2 can then turn off the switches in inverter circuit 1.

[0075] The process of the control circuit 2 controlling the drive motor 02 to enter the safety protection state may include:

[0076] In one scenario, after the control circuit 2 receives a fault signal corresponding to the upper bridge arm switch 111 in any bridge arm 11, the control circuit 2 can control the upper bridge arm switch 111 of each phase bridge arm 11 to close and control the lower bridge arm switch 112 of each phase bridge arm 11 to open, so that the drive motor 02 enters a safety protection state. In the safety protection state, the drive motor 02 can release the generated back electromotive force through the upper bridge arm of each phase bridge arm 11.

[0077] In another case, after the control circuit 2 receives a fault signal corresponding to the lower bridge arm switch tube 112 in any bridge arm 11, the control circuit 2 can control the lower bridge arm switch tube 111 of each phase bridge arm 11 to close and control the upper bridge arm switch tube 111 of each phase bridge arm 11 to open, so that the drive motor 02 enters a safety protection state. In the safety protection state, the drive motor 02 can release the generated back electromotive force through the lower bridge arm of each phase bridge arm 11.

[0078] The safety protection state includes the active short circuit ASC (Active Short Circuit, ASC) state and the switching pulse off SPO (Switching Pulse Off, SPO) state. The active short circuit ASC state refers to the upper bridge arm switch tubes of each phase bridge arm of the three-phase bridge arm 11 are all turned on or the lower bridge arm switch tubes are all turned on, and the three-phase winding of the drive motor 02 and the three upper bridge arm switch tubes or three lower bridge arm switch tubes in the on state and the three-phase winding form a closed loop. When the motor controller 011 enters the active short circuit protection ASC state, the motor controller 01 and the drive motor 02 are isolated from the power battery 04 to ensure the high voltage safety of the entire vehicle. It can also make the drive motor 02 generate reverse torque to brake the vehicle slowly. At the same time, when the motor controller 01 enters the active short circuit ASC state, it can prevent the drive motor 02 from generating excessive back electromotive force to damage the power battery 04, bus capacitors and other devices.

[0079] The fully-off SPO state means that the upper and lower bridge arm switches of each phase of the three-phase bridge arm 11 are all turned off, thereby isolating the motor controller 01, the drive motor 02 and the power battery 04.

[0080] In addition, since there is still a fault signal sent by the short-circuit detection module in the power module to the control circuit 2, the vehicle is in a low-speed driving state, that is, the speed of the drive motor 02 is relatively low, and the back electromotive force generated may be smaller than the input voltage of the inverter circuit 1. Therefore, another implementation method for step S1 can be that the control circuit 2 controls the drive motor 02 to enter a safety protection state in response to the current of the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of at least one phase bridge arm 11 of the three-phase bridge arm 11 being greater than the current threshold and the speed of the drive motor 02 being greater than the preset speed. Among them, the back electromotive force generated by the drive motor 02 is positively correlated with the speed of the drive motor 02. The preset speed can be set by the back electromotive force generated by the drive motor 02, that is, when the speed of the drive motor 02 is greater than the preset speed, the back electromotive force generated by the drive motor 02 is greater than the input voltage of the inverter circuit 1.

[0081] If the control circuit 2 responds to the current of the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of at least one phase bridge arm 11 of the three-phase bridge arm 11 being greater than the current threshold and the speed of the drive motor 02 being less than or equal to the preset speed, it can directly control the upper bridge arm switch tube 111 and the lower bridge arm switch tube 112 of the three-phase bridge arm 11 to be turned off, and execute step S3.

[0082] In step S2 , the control circuit 2 controls the upper arm switch tube 111 and the lower arm switch tube 112 of the three-phase bridge arm 11 to be turned off after the control circuit controls the drive motor 02 to enter the safety protection state for a preset time period.

[0083] The preset duration can be pre-set by a technician. The control circuit 2 controls the drive motor 02 to enter a safety protection state, indicating that the speed of the drive motor 02 is high and the back electromotive force generated is large. Therefore, after waiting for the vehicle to coast for a preset duration and reducing the speed of the drive motor 02, the upper bridge arm switch tube 111 and the lower bridge arm switch tube 112 of the three-phase bridge arm 11 are controlled to be turned off, thereby preventing the components in the motor controller 01 from being damaged by the back electromotive force generated by the drive motor 02.

[0084] Alternatively, another implementation of step S2 may be that the control circuit 2 controls both the upper arm switch tube 111 and the lower arm switch tube 112 of the three-phase bridge arm 11 to be turned off in response to the speed of the drive motor 02 being less than or equal to the preset speed.

[0085] Alternatively, another implementation method of step S2 may be that the control circuit 2 controls the upper arm switch tube 111 and the lower arm switch tube 112 of the three-phase bridge arm 11 to be turned off in response to the back electromotive force generated by the drive motor 02 being less than or equal to the input voltage of the inverter circuit 1.

[0086] After the control circuit 2 controls the drive motor 02 to enter the safety protection state, the control circuit 2 can periodically detect the speed of the drive motor 02, or the back electromotive force generated by the drive motor 02. After determining that the speed of the drive motor 02 is less than or equal to the preset speed, or the back electromotive force generated by the drive motor 02 is less than or equal to the input voltage of the inverter circuit 1, the upper arm switch tube 111 and the lower arm switch tube 112 of the three-phase bridge arm 11 are controlled to be turned off.

[0087] In step S3 , the control circuit 2 controls the switch module 114 corresponding to at least one phase bridge arm 11 to be disconnected in response to the current passing through the upper bridge arm switch 111 or the lower bridge arm switch 112 of at least one phase bridge arm 11 being greater than zero.

[0088] After the upper arm switch tube 111 and the lower arm switch tube 112 of the three-phase bridge arm 11 are both turned off, if there is no bridge arm 11 with a short circuit fault in the three-phase bridge arm 11, then no current should flow through the bridge arm midpoint 113 of each phase bridge arm 11, or no large current should flow through it. Therefore, a module for detecting the magnitude of the current passing through each bridge arm midpoint 113 can be set in the motor controller 01. If current is detected flowing through any bridge arm midpoint 113, or if the current flowing through is detected to be greater than a preset threshold, it can be determined that the bridge arm 11 to which any bridge arm midpoint 113 belongs does have a short circuit fault.

[0089] When the control circuit 2 once again determines that a short-circuit fault exists in the three-phase bridge arm 11, the switch module 114 connected to the bridge arm 11 with the short-circuit fault can be disconnected. In this way, the short-circuit current of the bridge arm 11 with the short-circuit fault will not flow to the winding of the drive motor 02, which can protect the drive motor 02. The bridge arm midpoint 113 of the remaining two-phase bridge arm 11 can continue to output two-phase AC power to the winding of the drive motor 02, so that the drive motor 02 operates in a missing phase, thereby preventing the vehicle equipped with the motor controller 01 from completely losing power and improving the driving safety of the vehicle.

[0090] The motor controller 01 provided in this application can be used to receive a torque signal sent by a vehicle controller 05 of the vehicle, and control the drive motor 02 to output the torque indicated by the torque signal.

[0091] When the inverter circuit 1 is normally used to output three-phase current to the drive motor 02 through the three-phase bridge arm 11, the control circuit 2 is specifically used to: in response to a short circuit of the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of one phase bridge arm 11 of the three-phase bridge arm 11, control the switch module 114 corresponding to at least one phase bridge arm 11 to be disconnected. In response to the disconnection of the switch module 114 corresponding to one phase bridge arm 11, control the bridge arm midpoint 113 of the other two phase bridge arms 11 to output two-phase alternating current, which is used to drive the drive motor 02 to output torque, and the average value of the torque output by the drive motor 02 driven by the two-phase alternating current is less than the torque value indicated by the torque signal.

[0092] In the motor controller 01 provided in the present application, after a short-circuit fault occurs in the bridge arm 11, the control circuit 2 can control the switch module 114 corresponding to the bridge arm 11 with the short-circuit fault to be disconnected. Then the bridge arm midpoint 113 of the remaining two-phase bridge arm 11 is controlled to output two-phase alternating current to the winding of the drive motor 02. The output two-phase alternating current can drive the vehicle drive motor 02 to output torque to ensure that the vehicle does not lose power. The drive motor 02 that drives the vehicle is changed from three-phase alternating current to two-phase alternating current, that is, one-phase winding of the drive motor 02 cannot generate torque normally. Therefore, after a short-circuit fault occurs in the bridge arm 11 of the motor controller 01, the average value of the torque output by the motor controller 01 driving the drive motor 02 is less than the torque value indicated by the torque signal.

[0093] In addition, to further ensure safe driving of the vehicle, while the control circuit 2 controls the remaining bridge arms 11 that have not experienced a short-circuit fault to output two-phase AC power to the drive motor 02, the control circuit 2 can control the speed of the drive motor 02 to be less than a preset speed value, thereby ensuring normal rotation of the drive motor 02 and preventing failure of the drive motor 02. This preset speed value can be set by a technician based on the performance of the drive motor 02. When the speed of the drive motor 02 is less than the preset speed value, it can safely output torque to the vehicle under the drive of the two-phase AC power.

[0094] In the process of the motor controller 01 provided in the present application providing two-phase alternating current to the drive motor 02, if a short-circuit fault occurs again in the remaining bridge arms 11 that have not experienced short-circuit fault, the corresponding processing may include: the control circuit 2 is used to control the drive motor 02 to enter a safety protection state in response to a short circuit of the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of any bridge arm 11 in the two-phase bridge arm 11.

[0095] In practice, if a short-circuit fault occurs again in the remaining bridge arms 11 that have not experienced short-circuit faults, the drive motor 02 can be controlled to enter the safety protection state again. The process of controlling the drive motor 02 to enter the safety protection state again may include:

[0096] In one case, when the control circuit 2 determines that a bridge arm 11 with a short-circuit fault appears again in the remaining two-phase bridge arms 11 that provide two-phase AC power to the drive motor 02, and determines that the upper bridge arm switch tube 111 of the bridge arm 11 with the short-circuit fault that appears again is short-circuited, the upper bridge arm switch tube 111 of the last bridge arm 11 that does not have a short-circuit fault is controlled to be closed and the lower bridge arm switch tube 112 to be disconnected, so that the drive motor 02 enters a safety protection state.

[0097] In another case, when the control circuit 2 determines that a bridge arm 11 with a short-circuit fault appears again in the remaining two-phase bridge arms 11 that provide two-phase AC power to the drive motor 02, and determines that the lower bridge arm switch tube 112 of the bridge arm 11 with the short-circuit fault that appears again is short-circuited, the control circuit 2 controls the lower bridge arm switch tube 112 of the last bridge arm 11 that does not have a short-circuit fault to close and the upper bridge arm switch tube 111 to disconnect, so that the drive motor 02 enters a safety protection state.

[0098] In addition, if a short-circuit fault occurs again in the remaining bridge arms 11 that have not experienced a short-circuit fault, the control circuit 2 controls the switch module 114 corresponding to the one-phase bridge arm 11 in the two-phase bridge arm 11 to disconnect in response to the current passing through the upper bridge arm switch tube 111 or the lower bridge arm switch tube 112 of the one-phase bridge arm 11 in the two-phase bridge arm 11 being greater than the current threshold.

[0099] During the process of inverter circuit 1 outputting two-phase AC power to drive motor 02, if a short-circuit fault occurs in one of the two bridge arms 11 outputting two-phase AC power, the switch module connected to the bridge arm 11 experiencing the short-circuit fault can be controlled to disconnect. In this way, the short-circuit current in the bridge arm 11 will not flow to the winding of drive motor 02, thereby protecting drive motor 02.

[0100] The present application also provides a powertrain 03, as shown in FIG4 , which includes a motor controller 01 and a drive motor 02 as described in the above embodiment. The motor controller 01 is used to provide three-phase AC power to the drive motor 02 to drive the drive motor 02 to output torque.

[0101] The powertrain 03 includes a resolver sensor and a current sensor. The resolver sensor is used to detect the rotational speed of the drive motor 02, and the current sensor is used to detect the three-phase current value of the drive motor 02. The motor controller 01 is used to receive the rotational speed signal from the resolver sensor and the three-phase current signal from the current sensor. The rotational speed signal is used to indicate the rotational speed of the drive motor 02, and the three-phase current signal is used to indicate the three-phase current value of the drive motor 02.

[0102] The present application also provides an electric vehicle, as shown in FIG5 , which includes the powertrain 03 shown in FIG4 , a vehicle controller 05 , and a power battery 04 . The power battery 04 can be used to supply power to the powertrain 03 , and the vehicle controller 05 is used to send a torque signal to the motor controller 01 .

[0103] The term "at least one" in this application means one or more, and the term "plurality" in this application means two or more.

[0104] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A motor controller (01) with short - circuit isolation function, characterized in that, The motor controller (01) includes an inverter circuit (1) and a control circuit (2), where: The inverter circuit (1) includes three-phase bridge arms (11), and each phase bridge arm (11) includes an upper bridge arm switching tube (111) and a lower bridge arm switching tube (112). The midpoint (113) of each phase bridge arm (11) is used to connect to a phase winding of the driving motor (02) through a switching module (114). The control circuit (2) is used for: Controlling the switching module (114) corresponding to each phase bridge arm (11) to close, and controlling the midpoints (113) of the three-phase bridge arms (11) to output three-phase currents to the three-phase windings of the driving motor (02). During the process that the inverter circuit (1) is used to output the three-phase currents, the control circuit (2) is specifically used for: In response to a short circuit of the upper bridge arm switching tube (111) or the lower bridge arm switching tube (112) of at least one phase bridge arm (11) of the three-phase bridge arms (11), controlling the switching module (114) corresponding to the at least one phase bridge arm (11) to disconnect.

2. The motor controller (01) according to claim 1, characterized in that, The motor controller (01) includes three driving circuits (3). Each driving circuit (3) is used to drive the upper bridge arm switching tube (111) and the lower bridge arm switching tube (112) of one phase bridge arm in the three-phase bridge arms. Each driving circuit (3) is used to receive a power supply, and different driving circuits (3) are used to receive different power supplies.

3. The motor controller (01) according to claim 2, characterized in that, During the process that the inverter circuit (1) is used to output the three-phase currents, the control circuit (2) is used for: In response to a short circuit of the upper bridge arm switching tube (111) or the lower bridge arm switching tube (112) of the at least one phase bridge arm (11), controlling the power supply corresponding to the at least one phase bridge arm (11) to stop power supply.

4. The motor controller (01) according to claim 1, characterized in that, During the process that the inverter circuit (1) is used to output the three-phase currents, the control circuit (2) is used for: In response to a short circuit of the upper bridge arm switching tube (111) or the lower bridge arm switching tube (112) of the at least one phase bridge arm (11), outputting a turn-off signal, and the turn-off signal is used to control the upper bridge arm switching tube (111) and the lower bridge arm switching tube (112) of the at least one phase bridge arm (11) to turn off.

5. The motor controller (01) according to claim 1, characterized in that, During the process that the inverter circuit (1) is used to output the three-phase currents, the control circuit (2) is used for: First controlling the non-shorted upper bridge arm switching tube (111) or the lower bridge arm switching tube (112) in the at least one phase bridge arm (11) to disconnect, and then controlling the switching module (114) corresponding to the at least one phase bridge arm (11) to disconnect.

6. The motor controller (01) according to claim 1, characterized in that, During the process that the inverter circuit (1) is used to output the three-phase currents, the control circuit (2) is specifically used for: In response to the current passing through the upper bridge arm switching tube (111) or the lower bridge arm switching tube (112) of at least one phase bridge arm (11) of the three-phase bridge arms (11) being greater than the current threshold, controlling the switching module (114) corresponding to the at least one phase bridge arm (11) to disconnect.

7. The motor controller (01) according to claim 1, characterized in that, During the process that the inverter circuit (1) is used to output the three-phase currents, the control circuit (2) is specifically used for: In response to the current passing through the upper-arm switching transistor (111) or the lower-arm switching transistor (112) of at least one phase arm (11) of the three-phase bridge arm (11) being greater than the current threshold, control the inverter circuit (1) to be in a safety protection state; In response to the control circuit controlling the inverter circuit (1) to be in the safety protection state for a preset duration, control both the upper-arm switching transistor (111) and the lower-arm switching transistor (112) of the three-phase bridge arm (11) to turn off; In response to the current passing through the upper-arm switching transistor (111) or the lower-arm switching transistor (112) of at least one phase arm (11) being greater than zero, control the switch module (114) corresponding to the at least one phase arm (11) to disconnect; The safety protection state includes an active short circuit ASC state or a full-switch-off SPO state.

8. The motor controller (01) according to claim 1, characterized in that, During the process in which the inverter circuit (1) is used to output the three-phase current, the control circuit (2) is specifically configured to: In response to the current passing through the upper-arm switching transistor (111) or the lower-arm switching transistor (112) of at least one phase arm (11) of the three-phase bridge arm (11) being greater than the current threshold and the rotational speed of the drive motor (02) being greater than the preset rotational speed, control the inverter circuit to be in the safety protection state; In response to the control circuit controlling the inverter circuit to be in the safety protection state and the rotational speed of the drive motor (02) decreasing to be less than or equal to the preset rotational speed, control both the upper-arm switching transistor (111) and the lower-arm switching transistor (112) of each phase arm of the three-phase bridge arm (11) to turn off; In response to the current passing through the upper-arm switching transistor (111) or the lower-arm switching transistor (112) of at least one phase arm (11) being greater than zero, control the switch module (114) corresponding to the at least one phase arm (11) to disconnect.

9. The motor controller (01) according to claim 1, characterized in that, The motor controller (01) is configured to receive a torque signal and control the drive motor (02) to output the torque indicated by the torque signal. During the process in which the inverter circuit (1) is used to output the three-phase current, the control circuit (2) is specifically configured to: In response to a short circuit of the upper-arm switching transistor (111) or the lower-arm switching transistor (112) of one phase arm (11) of the three-phase bridge arm (11), control the switch module (114) corresponding to the at least one phase arm (11) to disconnect; In response to the disconnection of the switch module (114) corresponding to the one phase arm (11), control the midpoints (113) of the other two phase arms (11) to output two-phase alternating current, and the two-phase alternating current is used to drive the drive motor (02) to output torque, and the average value of the torque output by the two-phase alternating current driving the drive motor (02) is less than the torque value indicated by the torque signal.

10. The motor controller (01) according to claim 9, characterized in that, During the process in which the inverter circuit (1) is used to output the two-phase alternating current, the motor controller (01) is configured to: Control the rotational speed of the drive motor (02) to be less than the rotational speed preset value.

11. The motor controller (01) according to claim 9, characterized in that, During the process in which the inverter circuit (1) is used to output the two-phase alternating current, the control circuit (2) is configured to: In response to a short circuit of the upper-bridge switch tube (111) or the lower-bridge switch tube (112) of any one of the two-phase bridge arms (11), control the inverter circuit to be in a safety protection state; The safety protection state includes an active short circuit ASC state or a full-switch-off SPO state.

12. The motor controller (01) according to claim 9, characterized in that, During the process that the inverter circuit (1) is used to output the two-phase alternating current, the control circuit is configured to: In response to the current passing through the upper-bridge switch tube (111) or the lower-bridge switch tube (112) of one of the two-phase bridge arms (11) being greater than the current threshold, control the switch module (114) corresponding to one of the two-phase bridge arms (11) to disconnect and control the inverter circuit to be in a safety protection state, The safety protection state includes an active short circuit ASC state or a full-switch-off SPO state.

13. A powertrain (03), characterized in that, The powertrain (03) includes the motor controller (01) and the drive motor (02) according to any one of claims 1 to 12, and the motor controller (01) is configured to receive a torque signal and control the drive motor (02) to output the torque indicated by the torque signal.

14. The powertrain (03) according to claim 13, characterized in that, The powertrain (03) includes a resolver sensor and a current sensor. The resolver sensor is configured to detect the rotational speed of the drive motor (02), and the current sensor is configured to detect the three-phase current value of the drive motor (02). The motor controller (01) is configured to receive the rotational speed signal from the resolver sensor and the three-phase current signal from the current sensor, wherein: The rotational speed signal is used to indicate the rotational speed of the drive motor (02), and the three-phase current signal is used to indicate the three-phase current value of the drive motor (02).

15. An electric vehicle (100), characterized in that, The electric vehicle (100) includes the powertrain (03), the vehicle controller (05), and the power battery (04) according to claim 13 or 14. The power battery (04) is configured to supply power to the powertrain (03), and the vehicle controller (05) is configured to send the torque signal to the motor controller (01).

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