An electric motor control system, its control method, and an electric vehicle

Abstract

The present application provides a motor control system and a control method thereof, an electric vehicle, and a motor control system, characterized in that the motor includes a first motor and a second motor, and the motor control system includes a first drive circuit, a second drive circuit and a control unit. The first drive circuit is connected to the first motor, the second drive circuit is connected to the second motor, and the control unit is connected to the first drive circuit and the second drive circuit respectively. The control unit is used to control the conduction or disconnection of the switches in the first drive circuit and the second drive circuit to determine the working status of the first drive circuit and the second drive circuit, and control the motor according to the working status of the first drive circuit and the second drive circuit. In this way, the convenience of using the electric vehicle can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a motor control system and a control method thereof, and an electric vehicle. Background Art

[0002] With the increasing maturity of power battery technology, electric vehicles have become a new direction for the development of the future automotive industry.

[0003] Currently, electric vehicles typically feature a motor that drives the wheels and a drive module. However, when a motor drive module malfunctions, rendering the motor inoperable, the typical solution is to remove the vehicle key, shut down the entire vehicle's high-voltage system, and wait for maintenance personnel to address the issue, or tow the vehicle to a repair station. This approach can be time-consuming and inconvenient for the user. Summary of the Invention

[0004] The present application aims to provide a motor control system and a control method thereof, and an electric vehicle, which can improve the convenience of using the electric vehicle.

[0005] To achieve the above objectives, in a first aspect, the present application provides a motor control system, wherein the motor includes a first motor and a second motor, and the motor control system includes a first drive circuit, a second drive circuit, and a control unit. The first drive circuit is connected to the first motor, the second drive circuit is connected to the second motor, and the control unit is connected to the first drive circuit and the second drive circuit, respectively. The control unit is used to control the on or off of switches in the first drive circuit and the second drive circuit to determine the operating status of the first drive circuit and the second drive circuit, and control the motor according to the operating status of the first drive circuit and the second drive circuit.

[0006] By providing two motors and acquiring the operating status of their drive circuits in real time, if one drive circuit experiences an abnormality, the other drive circuit can be used to drive the corresponding motor to perform the corresponding operation, thereby preventing the motor control system from stopping due to the inability to use one motor. Subsequently, if this motor control system is applied to an electric vehicle, if one of the two drive circuits experiences an abnormality, the other drive circuit, which does not experience the abnormality, can be used to drive the motor to the nearest maintenance point, thereby saving time, bringing convenience to users, and improving the convenience of electric vehicles.

[0007] In one optional embodiment, the first drive circuit and the second drive circuit each include N bridge arms, wherein a first end of each bridge arm is connected to a first end of an input power supply, and a second end of each bridge arm is connected to a first node with the second end of the input power supply, where N is a positive integer. The control unit is further configured to control the on / off switching of switches in the bridge arms and obtain a voltage at the first node. Based on the voltage at the first node, the operating state of the first drive circuit and the second drive circuit is determined, where the operating state includes a first operating state and a second operating state.

[0008] After controlling the on or off of the switch in the bridge arm, the voltage of the first node is obtained. Subsequently, based on the voltage of the first node, it is possible to determine whether the bridge arm has an abnormality such as a short circuit or an open circuit, thereby determining the first drive voltage and the operating state of the second drive circuit. Secondly, by obtaining the voltage of the first node, on the one hand, abnormalities can be discovered in a timely manner, so that the use of the abnormal drive circuit can be stopped, which can prevent the safety of users' lives and property from being affected by the abnormal drive circuit, and has a higher level of safety. On the other hand, when an abnormality occurs in the drive circuit, the specific abnormality can be found, so that the abnormality can be handled in a targeted manner, which is conducive to improving the efficiency of handling abnormalities.

[0009] In one optional embodiment, any bridge arm includes an upper bridge arm and a lower bridge arm, and the connection point between the upper bridge arm and the lower bridge arm is a midpoint, wherein the midpoint of the first drive circuit is used to connect to the first motor, and the midpoint of the second drive circuit is used to connect to the second motor. The control unit is further used to: control the switch of any lower bridge arm to be turned on, and control the other switches to be turned off. If the first voltage of the first node of the first drive circuit is greater than the first voltage threshold, it is determined that the first drive circuit is in the first working state. If the second voltage of the first node of the second drive circuit is greater than the second voltage threshold, it is determined that the second drive circuit is in the first working state.

[0010] Among them, the first voltage is greater than the first voltage threshold, which may correspond to the presence of voltage at the first node of the first drive circuit, and the second voltage is greater than the second voltage threshold, which may correspond to the presence of voltage at the first node of the second drive circuit. However, at this time, the switches in each upper bridge arm are all turned off, and under normal circumstances, there should be no voltage at the first node. Therefore, if the voltage of the first node is greater than the first voltage threshold, a short circuit abnormality occurs in at least one switch of the upper bridge arm. In this case, it is determined that the first drive circuit is in the first working state. Similarly, if the second voltage is greater than the second voltage threshold, it can be determined that the second drive circuit is in the first working state. Among them, by dividing the bridge arm into an upper bridge arm and a lower bridge arm, and separately detecting whether the upper bridge arm and the lower bridge arm have abnormalities, the probability of false detection can be reduced, which is conducive to more accurate determination of whether the drive circuit has abnormalities.

[0011] In one optional embodiment, the control unit is further configured to: if the first voltage is less than or equal to a first voltage threshold, control a switch of any upper bridge arm in the first drive circuit to be turned on, and control other switches in the first drive circuit to be turned off; if the first voltage is greater than the first voltage threshold, determine that the first drive circuit is in the first operating state; and if the first voltage is less than or equal to the first voltage threshold, determine that the first drive circuit is in the second operating state.

[0012] When the switches of each lower bridge arm in the first drive circuit are all turned off, if the first voltage is greater than the first voltage threshold, it can also be determined that the first drive circuit is in the first operating state. Conversely, if the first voltage is less than or equal to the first voltage threshold, it can be determined that no short-circuit abnormality has occurred in each lower bridge arm in the first drive circuit. At this point, the same method can be further used to confirm whether a short-circuit abnormality has occurred in each upper bridge arm. If no short-circuit abnormality has occurred in the upper bridge arm, then no short-circuit abnormality has occurred in the first drive circuit, and it can be determined that a circuit breaker abnormality has occurred in the first drive circuit. In this case, the first drive circuit is determined to be in the second operating state.

[0013] In one optional embodiment, the control unit is further configured to: if the second voltage is less than or equal to a second voltage threshold, control a switch of any upper bridge arm in the second drive circuit to be turned on, and control other switches in the second drive circuit to be turned off; if the second voltage is greater than the second voltage threshold, determine that the second drive circuit is in the first operating state; and if the second voltage is less than or equal to the second voltage threshold, determine that the second drive circuit is in the second operating state.

[0014] When the switches of each lower bridge arm in the second drive circuit are all turned off, if the second voltage is greater than the second voltage threshold, it can also be determined that the second drive circuit is in the first operating state. Conversely, if the second voltage is less than or equal to the second voltage threshold, it can be determined that no short-circuit abnormality has occurred in each lower bridge arm in the second drive circuit. At this point, the same method can be further used to confirm whether a short-circuit abnormality has occurred in each upper bridge arm. If no short-circuit abnormality has occurred in the upper bridge arm, then no short-circuit abnormality has occurred in the second drive circuit, and it can be determined that a circuit breaker abnormality has occurred in the second drive circuit. In this case, the second drive circuit is determined to be in the second operating state.

[0015] In one optional embodiment, the motor control system further includes a first switch and a second switch, wherein the first node of the first drive circuit is connected to the second end of the input power supply via the first switch, and the first node of the second drive circuit is connected to the second end of the input power supply via the second switch. A control unit is connected to the first switch and the second switch, respectively, and is specifically configured to: control the first switch to be turned off if the first drive circuit is in a first operating state, and control the first switch to be turned on if the first drive circuit is in a second operating state; control the second switch to be turned off if the second drive circuit is in the first operating state, and control the second switch to be turned on if the second drive circuit is in the second operating state.

[0016] When the first drive circuit is in the first working state, a short circuit abnormality occurs in the first drive circuit. If power is directly turned on at this time, the input power supply will be directly short-circuited, thereby damaging the input power supply. Therefore, it is necessary to control the first switch to be turned off to prevent the input power supply from being damaged. At the same time, the motor control system can be powered on normally, and then the second motor can be driven by the second drive circuit to drive the electric vehicle to operate. When the first drive circuit is in the second working state, a short circuit abnormality occurs in the first drive circuit. At this time, the first switch can be controlled to be turned on, which is equivalent to keeping the first switch in a normal working state. Thus, the control unit does not need to output a control signal to control the first switch, which is beneficial to reducing the energy consumption of the control unit. Similarly, when the second drive circuit is in the first working state, the second switch needs to be turned off, and when the second drive circuit is in the second working state, the second switch needs to be turned on.

[0017] In one optional embodiment, the motor control system further includes a third switch, wherein the first end of each bridge arm is connected to the first end of the input power supply via the third switch. Before controlling the on / off switching of the switches in the first drive circuit and the second drive circuit, the control unit is further configured to: determine whether the first drive circuit and / or the second drive circuit are abnormal. If the first drive circuit is determined to be abnormal, the first switch is controlled to be turned off and the third switch is controlled to be turned on. If the second drive circuit is determined to be abnormal, the second switch is controlled to be turned off and the third switch is controlled to be turned on.

[0018] Because the third switch is connected to the input power supply, turning on the third switch requires first turning off the switch corresponding to the driver circuit experiencing the abnormality. This prevents damage to the input power supply due to a short circuit that could occur when the third switch is turned on. Furthermore, preventing input power short circuits not only reduces the risk of damage to the electronic components in the motor control system but also prevents harm to the user, improving electrical safety.

[0019] In an optional embodiment, the control unit is further configured to: if the first drive circuit is in the first operating state or the second operating state and the second drive circuit is not abnormal, control the first motor to stop running and control the second motor to operate at a first preset power; if the second drive circuit is in the first operating state or the second operating state and the first drive circuit is not abnormal, control the second motor to stop running and control the first motor to operate at the first preset power.

[0020] If the first drive circuit is in the first working state or the second working state, the first drive circuit has an abnormality, the first motor should be controlled to stop running, and the second motor should be driven to run at the first preset power by the second drive circuit without abnormality. Thus, when the motor control system is applied to an electric vehicle, the electric vehicle can be driven to the nearest maintenance point by the second motor, so as to reduce the waiting time of the user and bring convenience to the user. Similarly, if the second drive circuit is in the first working state or the second working state, the second motor should be controlled to stop running, and the first motor should be driven to run at the first preset power by the first drive circuit without abnormality. It can be seen that when an abnormality occurs in the electric vehicle, the abnormality can be handled in a timely manner, which is conducive to improving the efficiency of abnormality handling, and is more practical for users, that is, it can improve the practicality of the electric vehicle.

[0021] In a second aspect, the present application provides a control method for a motor control system, wherein the motor includes a first motor and a second motor, and the motor control system includes a first drive circuit and a second drive circuit, wherein the first drive circuit is connected to the first motor, and the second drive circuit is connected to the second motor. The method includes: controlling the on or off of switches in the first drive circuit and the second drive circuit to determine the operating status of the first drive circuit and the second drive circuit. The motor is controlled according to the operating status of the first drive circuit and the second drive circuit.

[0022] In one optional embodiment, the first drive circuit and the second drive circuit each include N bridge arms, a first end of each bridge arm is connected to a first end of an input power supply, and a second end of each bridge arm is connected to a first node with the second end of the input power supply, where N is a positive integer. Controlling the on or off state of switches in the first drive circuit and the second drive circuit to determine an operating state of the first drive circuit and the second drive circuit includes: controlling the on or off state of the switches in the bridge arms and determining the operating state of the first drive circuit and the second drive circuit based on a voltage at the first node, where the operating state includes a first operating state and a second operating state.

[0023] In an optional manner, any bridge arm includes an upper bridge arm and a lower bridge arm, and the connection point between the upper bridge arm and the lower bridge arm is a midpoint, wherein the midpoint of the first drive circuit is used to connect to the first motor, and the midpoint of the second drive circuit is used to connect to the second motor. Controlling the on or off of the switches in the bridge arm and determining the working states of the first drive circuit and the second drive circuit based on the voltage of the first node includes: controlling the switch of any lower bridge arm to be on and controlling the other switches to be off. If the first voltage of the first node of the first drive circuit is greater than the first voltage threshold, it is determined that the first drive circuit is in the first working state. If the second voltage of the first node of the second drive circuit is greater than the second voltage threshold, it is determined that the second drive circuit is in the first working state.

[0024] In one optional embodiment, the method further includes: if the first voltage is less than or equal to a first voltage threshold, controlling a switch of any upper bridge arm in the first drive circuit to be turned on, and controlling other switches in the first drive circuit to be turned off. If the first voltage is greater than the first voltage threshold, determining that the first drive circuit is in the first operating state. If the first voltage is less than or equal to the first voltage threshold, determining that the first drive circuit is in the second operating state.

[0025] In one optional embodiment, the method further includes: if the second voltage is less than or equal to a second voltage threshold, controlling a switch of any upper bridge arm in the second drive circuit to be turned on, and controlling other switches in the second drive circuit to be turned off. If the second voltage is greater than the second voltage threshold, determining that the second drive circuit is in the first operating state. If the second voltage is less than or equal to the second voltage threshold, determining that the second drive circuit is in the second operating state.

[0026] In one optional embodiment, the motor control system further includes a first switch and a second switch, wherein the first node of the first drive circuit is connected to the second end of the input power supply via the first switch, and the first node of the second drive circuit is connected to the second end of the input power supply via the second switch. The method further includes: if the first drive circuit is in a first operating state, controlling the first switch to be turned off; if the first drive circuit is in a second operating state, controlling the first switch to be turned on; if the second drive circuit is in the first operating state, controlling the second switch to be turned off; if the second drive circuit is in the second operating state, controlling the second switch to be turned on.

[0027] In one optional embodiment, the motor control system further includes a third switch, wherein the first end of each bridge arm is connected to the first end of the input power supply via the third switch. Before controlling the on / off switching of the switches in the first drive circuit and the second drive circuit, the method further includes: determining whether the first drive circuit and / or the second drive circuit are abnormal. If the first drive circuit is determined to be abnormal, the first switch is turned on and the third switch is controlled to be turned on. If the second drive circuit is determined to be abnormal, the second switch is turned on and the third switch is controlled to be turned on.

[0028] In one optional embodiment, controlling the motor according to the operating states of the first drive circuit and the second drive circuit includes: if the first drive circuit is in the first operating state or the second operating state and the second drive circuit is not abnormal, controlling the first motor to stop running and controlling the second motor to run at a first preset power; if the second drive circuit is in the first operating state or the second operating state and the first drive circuit is not abnormal, controlling the second motor to stop running and controlling the first motor to run at the first preset power.

[0029] In a third aspect, the present application provides a control device for a motor control system, comprising: the motor comprising a first motor and a second motor; the motor control system comprising a first drive circuit and a second drive circuit; the first drive circuit being connected to the first motor; and the second drive circuit being connected to the second motor. The device comprises: a switch control unit for controlling the on or off of switches in the first drive circuit and the second drive circuit to determine the operating states of the first drive circuit and the second drive circuit; and a motor control unit for controlling the motor according to the operating states of the first drive circuit and the second drive circuit.

[0030] In a fourth aspect, the present application provides an electric vehicle comprising: a battery and the motor control system described above. The battery is connected to the motor control system and is used to provide input power to the motor of the motor control system.

[0031] In a fifth aspect, the present application provides a computer-readable storage medium, comprising: storing computer-executable instructions, wherein the computer-executable instructions are set to be the method flow described in any one of the above items.

[0032] The beneficial effects of the embodiments of the present application are as follows: the motor control system provided by the present application includes two motors and two drive circuits. By determining the operating status of the two drive circuits, it is possible to determine whether the two motor drive circuits have any abnormalities. Therefore, if the motor control system is applied to an electric vehicle, when one of the two drive circuits has an abnormality, the other drive circuit that has not experienced the abnormality can be used to drive the corresponding motor to drive the electric vehicle to the nearest maintenance point, thereby saving the user time, bringing convenience to the user, and improving the convenience of electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0034] Figure 1This is a schematic structural diagram of a vehicle disclosed in one embodiment of the present application;

[0035] Figure 2 It is a structural diagram of a motor control system disclosed in one embodiment of the present application;

[0036] Figure 3 1 is a schematic diagram of the circuit structure of a motor control system disclosed in an embodiment of the present application;

[0037] Figure 4 is a flow chart of a control method of a motor control system disclosed in one embodiment of the present application;

[0038] Figure 5 is a circuit structure diagram of a motor control system disclosed in another embodiment of the present application;

[0039] Figure 6 is a flow chart of a control method of a motor control system disclosed in another embodiment of the present application;

[0040] Figure 7 1 is a schematic structural diagram of a control device of a motor control system disclosed in one embodiment of the present application;

[0041] Figure 8 It is a structural diagram of a control unit disclosed in one embodiment of the present application.

[0042] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0043] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0045] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0046] In recent years, the new energy vehicle industry has experienced explosive growth. With rising consumer spending power and consumer values, electric vehicles are increasingly becoming the primary choice for urban residents. Compared to traditional fuel vehicles, electric vehicles offer advantages such as high efficiency, low emissions, and renewable energy, playing a significant role in conserving fossil fuels and improving the ecological environment.

[0047] During the process of developing this application, the inventors discovered that currently common electric vehicles are generally provided with a motor for driving the wheels and a drive module for driving the motor. Specifically, the drive module drives the motor, which in turn drives the wheels to rotate, thereby driving the vehicle.

[0048] However, when a motor drive module malfunctions and the motor becomes unusable, the typical solution is to remove the car key to power down the entire vehicle's high-voltage system, and then wait for maintenance personnel to handle the issue, or have the vehicle towed to a repair station. This can be time-consuming and inconvenient for the user.

[0049] Based on this, the applicant has designed a motor control system that includes two motors. This system determines the operating status of the drive circuits that drive these two motors and then controls the corresponding motors based on the determined operating status. Therefore, when this motor control system is applied to an electric vehicle, if one drive circuit malfunctions, the other drive circuit can be used to drive the motor, allowing the electric vehicle to the nearest repair station for timely resolution of the malfunction. This saves the user time and provides convenience, thereby improving the convenience of the electric vehicle.

[0050] For the convenience of description, the following embodiments are described by taking a vehicle 10 as an example of an electrical device according to an embodiment of the present application.

[0051] Please refer to Figure 1 , Figure 1A schematic structural diagram of a vehicle provided for some embodiments of the present application. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 11 is provided inside the vehicle, and the battery 11 may be provided at the bottom, head or tail of the vehicle. The battery 11 includes at least one battery cell, which is used for charging or discharging, and can be repeatedly charged in a recyclable and rechargeable manner. The battery 11 can be used to power the vehicle, for example, the battery 11 can be used as an operating power source for the vehicle. The vehicle may include a controller 12 and a motor 13, and the controller 12 is used to control the battery 11 to power the motor 13, for example, for starting, navigating and driving the vehicle.

[0052] See also Figure 2 , Figure 2 This is a schematic diagram of the structure of the motor control system provided in the embodiment of the present application. Figure 2 As shown, the motor includes a first motor M1 and a second motor M2. The motor control system includes a first drive circuit 21, a second drive circuit 22, and a control unit 23. The first drive circuit 21 is connected to the first motor M1, the second drive circuit 22 is connected to the second motor M2, and the control unit 23 is connected to the first drive circuit 21 and the second drive circuit 22 respectively.

[0053] Specifically, the control unit 23 is used to: control the on or off of the switches in the first drive circuit 21 and the second drive circuit 22 to determine the working status of the first drive circuit 21 and the second drive circuit 22, and control the motor according to the working status of the first drive circuit 21 and the second drive circuit 22.

[0054] In this embodiment, the operating state of the first drive circuit 21 can be determined by controlling the on / off switching of each switch in the first drive circuit 21, and the operating state of the second drive circuit 22 can be determined by controlling the on / off switching of each switch in the second drive circuit 22. Subsequently, it is possible to determine whether an abnormality has occurred in either the first drive circuit 21 or the second drive circuit 22. Therefore, if an abnormality occurs in one drive circuit, the other drive circuit can be used to drive the corresponding motor to perform the corresponding operation, thereby preventing the motor control system from ceasing operation due to one motor being unusable. Therefore, when this motor control system is applied to an electric vehicle, if an abnormality occurs in the first drive circuit 21 and the second drive circuit 22 is normal, the second drive circuit 22 can be used to drive the second motor to drive the electric vehicle to the nearest repair point. If an abnormality occurs in the second drive circuit 22 and the first drive circuit 21 is normal, the first drive circuit 21 can be used to drive the second motor to drive the electric vehicle to the nearest repair point. This saves users waiting time, provides convenience to users, and improves the convenience of electric vehicles.

[0055] In one embodiment, the first driving circuit and the second driving circuit each include N bridge arms, the first end of each bridge arm is connected to the first end of the input power supply, and the second end of the bridge arm and the second end of the input power supply are connected to a first node, where N is a positive integer.

[0056] The control unit is further configured to control the on / off switching of the switch in the bridge arm and obtain the voltage of the first node, and determine the operating states of the first drive circuit and the second drive circuit based on the voltage of the first node, wherein the operating states include a first operating state and a second operating state.

[0057] It is understood that in this embodiment, when the first drive circuit or the second drive circuit is in the first working state, a short circuit anomaly occurs in the corresponding first drive circuit or the second drive circuit; when the first drive circuit or the second drive circuit is in the second working state, a circuit break anomaly occurs in the corresponding first drive circuit or the second drive circuit. In other embodiments, when the first drive circuit or the second drive circuit is in the first working state, a circuit break anomaly occurs in the corresponding first drive circuit or the second drive circuit; when the first drive circuit or the second drive circuit is in the second working state, a short circuit anomaly occurs in the corresponding first drive circuit or the second drive circuit. This embodiment of the present application is not limited to this.

[0058] by Figure 3 The motor control system shown in FIG. 1 is used as an example for explanation. In this embodiment, N is 3, i.e., the first drive circuit 21 and the second drive circuit 22 each include three bridge arms. The first drive circuit 21 includes a bridge arm 211, a bridge arm 212, and a bridge arm 213. Bridge arm 211 is connected in parallel with bridge arm 212 and bridge arm 213. The first end of bridge arm 211, the first end of bridge arm 212, and the first end of bridge arm 213 are all connected to the first end of the input power supply 24. The second end of bridge arm 211, the second end of bridge arm 212, and the second end of bridge arm 213 are all connected to the second end of the input power supply 24 at a first node U01. The second driving circuit 22 includes a bridge arm 221, a bridge arm 222, and a bridge arm 223. The bridge arm 221 is connected in parallel with the bridge arm 222 and the bridge arm 223. The first end of the bridge arm 221, the first end of the bridge arm 222, and the first end of the bridge arm 223 are all connected to the first end of the input power source 24. The second end of the bridge arm 221, the second end of the bridge arm 222, and the second end of the bridge arm 223 are all connected to the second end of the input power source 24 at a first node U02. In this embodiment, the input power source 24 is a battery.

[0059] Specifically, the control end of the switch in each bridge arm (including bridge arm 211, bridge arm 212, bridge arm 213, bridge arm 221, bridge arm 222 and bridge arm 223) is connected to the control unit 23. That is, the control unit 23 can be used to control the conduction or shutdown of the switch in each bridge arm. Then, the control unit 23 can obtain the voltage of the first node U01 in the first drive circuit 21 and the voltage in the first node U02 in the second drive circuit 22. And determine the working state of the first drive circuit 21 according to the voltage of the first node U01 in the first drive circuit 21, and determine the working state of the second drive circuit 21 according to the voltage in the first node U02 in the second drive circuit 22. Furthermore, the control unit 23 can determine whether the first drive circuit 21 and the second drive circuit 22 are abnormal.

[0060] In one embodiment, any bridge arm includes an upper bridge arm and a lower bridge arm, and the connection point between the upper bridge arm and the lower bridge arm is the midpoint, wherein the midpoint of the first drive circuit is used to connect to the first motor, and the midpoint of the second drive circuit is used to connect to the second motor.

[0061] The control unit is further configured to: control any switch of the lower bridge arm to be turned on, and control the other switches to be turned off. If the first voltage of the first node of the first drive circuit is greater than a first voltage threshold, the first drive circuit is determined to be in the first operating state. If the second voltage of the first node of the second drive circuit is greater than a second voltage threshold, the second drive circuit is determined to be in the first operating state.

[0062] It is understandable that the first voltage threshold and the second voltage threshold can be set according to actual application conditions, and the first voltage threshold and the second voltage threshold can be the same or different. For example, in one embodiment, the first voltage threshold and the second voltage threshold are both set to 0.

[0063] Still Figure 3The motor control system shown in FIG. 1 is used as an example for explanation. In this embodiment, bridge arm 211 includes an upper bridge arm 2111 and a lower bridge arm 2112, with the midpoint between the upper bridge arm 2111 and the lower bridge arm 2112 being P11. Bridge arm 212 includes an upper bridge arm 2121 and a lower bridge arm 2122, with the midpoint between the upper bridge arm 2121 and the lower bridge arm 2122 being P12. Bridge arm 213 includes an upper bridge arm 2131 and a lower bridge arm 2132, with the midpoint between the upper bridge arm 2131 and the lower bridge arm 2132 being P13. Bridge arm 221 includes an upper bridge arm 2211 and a lower bridge arm 2212, with the midpoint between the upper bridge arm 2211 and the lower bridge arm 2212 being P21. Bridge arm 222 includes an upper bridge arm 2221 and a lower bridge arm 2222, with the midpoint between the upper bridge arm 2221 and the lower bridge arm 2222 being P22. The bridge arm 223 includes an upper bridge arm 2231 and a lower bridge arm 2232. The midpoint between the upper bridge arm 2231 and the lower bridge arm 2232 is P23. The midpoints P11, P12, and P13 are all connected to the first motor M1, and the midpoints P21, P22, and P23 are all connected to the second electrode M2.

[0064] Meanwhile, in this embodiment, each upper bridge arm includes a switch tube, and each lower bridge arm includes a switch tube. For example, the upper bridge arm 2111 includes a switch tube Q11, and the lower bridge arm 2112 includes a switch tube Q12.

[0065] Specifically, the control unit 23 first controls the switch in any lower bridge arm of the first drive circuit 21 to turn on, and controls the other switch tubes in the first drive circuit 21 to turn off. For example, the control unit 23 controls the switch Q12 to turn on (i.e., the switch Q12 is turned on), and controls the switch tubes Q11, Q13, Q14, Q15, and Q16 to turn off. After the first drive circuit 21 is connected to the input power supply 24, if the first drive circuit 21 is not abnormal, since only the switch tube in one of the lower bridge arms is turned on, the bridge arms 211, 212, and 213 should all be open-circuited. However, at this time, if it can be detected that the first voltage on the first node U01 is greater than the first voltage threshold, it can be determined that there is a voltage on the first node U01. Then, at least the switch tube in the upper bridge arm connected to the turned-on lower bridge arm has a short circuit abnormality, and the first drive circuit 21 is determined to be in the first operating state. For example, if switch Q12 is conducting, it can be determined that at least switch Q11 is short-circuited. Bridge arm 211 acts as a conductor, thereby detecting that the first voltage is greater than the first voltage threshold. The process for determining whether second drive circuit 22 is in the first operating state is similar to that for first drive circuit 21 and is readily understood by those skilled in the art, so further description is omitted.

[0066] In one embodiment, the control unit is further configured to: if the first voltage is less than or equal to a first voltage threshold, control a switch of any upper bridge arm in the first drive circuit to be turned on, and control other switches in the first drive circuit to be turned off; if the first voltage is greater than the first voltage threshold, determine that the first drive circuit is in the first operating state; and if the first voltage is less than or equal to the first voltage threshold, determine that the first drive circuit is in the second operating state.

[0067] Still Figure 3 The motor control system shown in FIG. 1 is used as an example. After the control unit 23 controls the switching transistors in any lower bridge arm of the first drive circuit 21 to turn on and controls the other switching transistors in the first drive circuit 21 to turn off, if the first voltage is detected to be less than or equal to the first voltage threshold, it can be considered that the voltage at the first node U01 is low or non-existent. This can determine that no short circuit anomalies exist in the upper bridge arm 2111, the upper bridge arm 2121, and the upper bridge arm 2131.

[0068] Furthermore, after determining that the upper bridge arm 2111, the upper bridge arm 2121, and the upper bridge arm 2131 do not have a short-circuit anomaly, it can be further determined whether each lower bridge arm has an abnormality. Specifically, the control unit 23 controls the switch tube in any upper bridge arm of the first drive circuit 21 to turn on, and controls the other switch tubes in the first drive circuit 21 to turn off. Similarly, if the first voltage is greater than the first voltage threshold, it can be determined that the switch tube of at least one lower bridge arm is short-circuited. For example, if the switch tube Q13 is controlled to be turned on, it can be determined that the switch tube Q14 has a short-circuit anomaly, and then it can be determined that the first drive circuit 21 is in the first working state. Conversely, if the first voltage is less than or equal to the first voltage threshold, then the lower bridge arm 2112, the lower bridge arm 2122, and the lower bridge arm 2132 do not have a short-circuit anomaly. Therefore, if it is determined that no short circuit abnormality occurs in the upper bridge arm 2111, the upper bridge arm 2121, the upper bridge arm 2131, the lower bridge arm 2112, the lower bridge arm 2122 and the lower bridge arm 2132, and on the premise that it is known that an abnormality has occurred in the first drive circuit 21, it can be determined that a short circuit abnormality occurs in the first drive circuit 21, which can also be called an open circuit abnormality. At this time, the first drive circuit 21 is in the second working state.

[0069] In one embodiment, the control unit is further configured to: if the second voltage is less than or equal to a second voltage threshold, control a switch of any upper bridge arm in the second drive circuit to be turned on, and control other switches in the second drive circuit to be turned off; if the second voltage is greater than the second voltage threshold, determine that the second drive circuit is in the first operating state; and if the second voltage is less than or equal to the second voltage threshold, determine that the second drive circuit is in the second operating state.

[0070] Still Figure 3The motor control system shown in FIG. 1 is used as an example for explanation. After the control unit 23 controls the switching transistors in any lower bridge arm of the second drive circuit 22 to turn on and controls the other switching transistors in the second drive circuit 22 to turn off, if the second voltage is detected to be less than or equal to the second voltage threshold, it can be considered that the voltage at the first node U02 is low or non-existent. This can determine that no short circuit anomaly exists in the upper bridge arm 2211, the upper bridge arm 2221, and the upper bridge arm 2231.

[0071] Furthermore, after determining that upper bridge arm 2211, upper bridge arm 2221, and upper bridge arm 2231 do not have a short-circuit anomaly, it is further determined whether any abnormality exists in the lower bridge arms of the second drive circuit 22. Specifically, the control unit 23 controls the switch tube in any upper bridge arm of the second drive circuit 22 to turn on, and controls the other switch tubes in the second drive circuit 22 to turn off. Similarly, if the second voltage is greater than the second voltage threshold, it can be determined that the switch tube in at least one lower bridge arm is short-circuited. For example, if the switch tube Q21 is controlled to be turned on, it can be determined that the switch tube Q22 has a short-circuit anomaly, and then it can be determined that the second drive circuit 22 is in the first operating state. Conversely, if the second voltage is less than or equal to the second voltage threshold, it is determined that none of the lower bridge arms 2212, lower bridge arm 2222, and lower bridge arm 2232 have a short-circuit anomaly. Therefore, if it is determined that no short circuit abnormality occurs in the upper bridge arm 2211, the upper bridge arm 2221, the upper bridge arm 2231, the lower bridge arm 2212, the lower bridge arm 2222 and the lower bridge arm 2232, and on the premise that an abnormality has occurred in the second drive circuit 22, it can be determined that an open circuit abnormality occurs in the second drive circuit 22. At this time, the second drive circuit 22 is in the second working state.

[0072] In this embodiment, by dividing the bridge arm into an upper bridge arm and a lower bridge arm, and detecting whether the upper bridge arm and the lower bridge arm are abnormal respectively, the probability of false detection can be reduced, which is conducive to more accurately determining whether the driving circuit is abnormal.

[0073] In one embodiment, the motor control system further includes a first switch and a second switch, wherein the first node of the first drive circuit is connected to the second end of the input power supply via the first switch, and the first node of the second drive circuit is connected to the second end of the input power supply via the second switch. The control unit is connected to the first switch and the second switch, respectively.

[0074] The control unit is specifically configured to: control the first switch to be turned off if the first drive circuit is in the first working state, and control the first switch to be turned on if the first drive circuit is in the second working state; control the second switch to be turned off if the second drive circuit is in the first working state, and control the second switch to be turned on if the second drive circuit is in the second working state.

[0075] Still Figure 3The motor control system shown in FIG. 1 is used as an example for explanation. The motor control system further includes a first switch S1 and a second switch S2. The first node U01 is connected to the second end of the input power supply via the first switch S1, and the first node U02 is connected to the second end of the input power supply via the second switch S2.

[0076] It is understandable that during the normal operation of the motor control system, the first switch S1 and the second switch S2 should be kept in a normally closed state to realize the driving process of the first motor M1 and the second motor M2.

[0077] At the same time, in this embodiment, the first switch S1 and the second switch S2 are both connected to the negative pole of the input power supply 24. In other embodiments, the first switch S1 and the second switch S2 can also be connected to the positive pole of the input power supply 24. The embodiment of the present application is not limited to this.

[0078] When the first drive circuit 21 is in the first operating state, a short circuit anomaly occurs in the first drive circuit 21. Directly connecting the input power supply 24 to the first drive circuit 21 at this time would cause the input power supply 24 to short-circuit and be damaged. Therefore, it is necessary to first control the first switch S1 to be turned off to protect the input power supply 24. Furthermore, by preventing the input power supply 24 from short-circuiting, the risk of damage to the electronic components in the motor control system is reduced and harm to the user is prevented by the input power supply 24, thereby improving power safety.

[0079] At the same time, the motor control system can be powered on normally, thereby not affecting the second drive circuit 22 driving the second motor M2. When this motor control system is applied to an electric vehicle, and only when an abnormality occurs in the first drive circuit 21, the second drive circuit 22 can still drive the second motor M2 to drive the electric vehicle to a repair point. Thus, when an abnormality occurs in the electric vehicle, the abnormality can be promptly addressed, which helps improve the efficiency of abnormality handling and is more practical for users, thereby improving the practicality of the electric vehicle.

[0080] When the first drive circuit 21 is in the second operating state, the first switch S1 can be turned on. Since the first drive circuit 21 is disconnected, turning on the first switch S1 will not adversely affect other electronic components, such as the input power supply 24. While the first switch S1 is turned on, i.e., the first switch S1 remains in its initial state, the control unit 23 does not need to output a control signal to control the first switch S1. This reduces the energy consumption of the control unit 23.

[0081] Similarly, when the second driving circuit 22 is in the first working state, the second switch should be controlled to be turned on, and when the second driving circuit 22 is in the second working state, the second switch should be controlled to be turned on.

[0082] In one embodiment, the motor control system further includes a third switch, and the first end of any bridge arm is connected to the first end of the input power supply through the third switch.

[0083] Before controlling the on / off switching of the switches in the first and second drive circuits, the control unit is further configured to determine whether the first and / or second drive circuits are abnormal. If the first drive circuit is determined to be abnormal, the control unit controls the first switch to be turned off and the third switch to be turned on. If the second drive circuit is determined to be abnormal, the control unit controls the second switch to be turned off and the third switch to be turned on.

[0084] In this embodiment, before determining the operating status of the first and second drive circuits 21 and 22 by controlling the on / off switching of the switches of the first and second drive circuits 21 and 22, it is first determined whether the first and / or second drive circuits 21 and 22 are abnormal. If neither the first and second drive circuits 21 and 22 are abnormal, each drive circuit can drive the corresponding motor to operate in a normal driving manner. If at least one of the first and second drive circuits 21 and 22 is abnormal, it is necessary to determine the operating status of the abnormal drive circuit to identify the specific abnormality. Thus, on the one hand, by promptly detecting the abnormality and stopping the use of the abnormal drive circuit, the safety of users' lives and property can be prevented from being affected by the abnormality of the drive circuit, thereby improving safety. On the other hand, when an abnormality occurs in the drive circuit, the specific abnormality can be found and targeted treatment can be carried out, which is conducive to improving the efficiency of abnormality handling.

[0085] Specifically, if an abnormality is determined in the first drive circuit 21, the first switch S1 should first be turned off to prevent a short circuit in the first drive circuit 21 from causing damage to the input power supply 24. The third switch S3 should then be turned on to connect the input power supply 24 to the first drive circuit 21. After the input power supply 24 is connected, the switches of the first drive circuit 21 can be turned on or off to determine the operating state of the first drive circuit 21 and whether the abnormality in the first drive circuit 21 is a short circuit or an open circuit.

[0086] If the second drive circuit 22 is determined to be abnormal, the second switch S2 should first be turned off to prevent a short circuit in the second drive circuit 22 from causing damage to the input power supply 24. The third switch S3 should then be turned on to connect the input power supply 24 to the second drive circuit 22. After the input power supply 24 is connected, the switches of the second drive circuit 22 can be turned on or off to determine the operating status of the second drive circuit 22 and whether the abnormality in the second drive circuit 22 is a short circuit or an open circuit.

[0087] If both the first drive circuit 21 and the second drive circuit 22 experience an abnormality, the first switch S1 and the second switch S2 should be turned off first, and then the third switch S3 should be turned on. Subsequently, the solution provided in the above embodiment can be used to determine whether the abnormality in the first drive circuit 21 and the second drive circuit 22 is a short circuit or an open circuit.

[0088] In one embodiment, the control unit is further configured to: if the first drive circuit is in the first operating state or the second operating state and there is no abnormality in the second drive circuit, control the first motor to stop running and control the second motor to run at a first preset power; if the second drive circuit is in the first operating state or the second operating state and there is no abnormality in the first drive circuit, control the second motor to stop running and control the first motor to run at the first preset power.

[0089] Among them, the first preset power can be a fixed value pre-set in the control unit, or it can be a value set by the user according to actual application conditions, and the embodiment of the present application does not limit this.

[0090] In this embodiment, if the first drive circuit 21 is in the first operating state or the second operating state, or if a short circuit or open circuit anomaly occurs in the first drive circuit 21, the first motor M1 is stopped, and the second drive circuit 22, which is not experiencing an anomaly, drives the second motor M2 to operate at the first preset power. Consequently, when this motor control system is applied to an electric vehicle, the electric vehicle can be driven to the nearest repair point by the second motor M2, reducing waiting time for the user, providing convenience for the user and thereby improving the convenience of the electric vehicle.

[0091] Furthermore, even if a malfunction occurs during the user's use of the electric vehicle, a backup solution is available to assist the user in quickly addressing the malfunction and quickly resuming normal use of the electric vehicle. This improves the efficiency of repairs when an malfunction occurs, thereby contributing to improved practicality of the electric vehicle.

[0092] Likewise, if the second driving circuit 22 is in the first working state or the second working state, the second motor M2 should be controlled to stop running, and the first driving circuit 22 without any abnormality should drive the first motor M1 to run at the first preset power.

[0093] Please refer to Figure 4 , Figure 4 Flowchart of the control method of the motor control system provided in the embodiment of the present application. Here, the structure of the motor control system can refer to the above Figures 2 to 3 The detailed description of is omitted here. Figure 4 As shown, the control method of the motor control system includes the following steps:

[0094] Step 41: Control the on or off of switches in the first driving circuit and the second driving circuit to determine the working states of the first driving circuit and the second driving circuit.

[0095] Step 42: Control the motor according to the working status of the first drive circuit and the second drive circuit.

[0096] By acquiring the operating status of the two motor drive circuits in real time, if one drive circuit experiences an abnormality, the other drive circuit can be used to drive the corresponding motor to perform the corresponding operation, thereby preventing the motor control system from stopping operation due to the inability to use one motor. Subsequently, when this motor control system is applied to an electric vehicle, if one of the two drive circuits experiences an abnormality, the other drive circuit that has not experienced the abnormality can be used to drive the motor to the nearest maintenance point, thereby saving users time, bringing convenience to users, and helping to improve the convenience of electric vehicles.

[0097] In one embodiment, the first drive circuit and the second drive circuit each include N bridge arms, wherein a first end of each bridge arm is connected to a first end of an input power supply, and a second end of each bridge arm is connected to a second end of the input power supply at a first node, where N is a positive integer. Controlling the on or off state of switches in the first drive circuit and the second drive circuit to determine an operating state of the first drive circuit and the second drive circuit includes: controlling the on or off state of the switches in the bridge arms and determining the operating state of the first drive circuit and the second drive circuit based on a voltage at the first node, wherein the operating state includes a first operating state and a second operating state.

[0098] In one embodiment, any bridge arm includes an upper bridge arm and a lower bridge arm, and the connection point between the upper bridge arm and the lower bridge arm is a midpoint, wherein the midpoint of the first drive circuit is used to connect to the first motor, and the midpoint of the second drive circuit is used to connect to the second motor. Controlling the on or off of the switches in the bridge arm and determining the operating states of the first drive circuit and the second drive circuit based on the voltage of the first node includes: controlling the switch of any lower bridge arm to be on and controlling the other switches to be off. If the first voltage of the first node of the first drive circuit is greater than the first voltage threshold, then the first drive circuit is determined to be in the first operating state. If the second voltage of the first node of the second drive circuit is greater than the second voltage threshold, then the second drive circuit is determined to be in the first operating state.

[0099] In one embodiment, the control method of the motor control system further includes: if the first voltage is less than or equal to a first voltage threshold, controlling a switch of any upper bridge arm in the first drive circuit to be turned on, and controlling other switches in the first drive circuit to be turned off. If the first voltage is greater than the first voltage threshold, determining that the first drive circuit is in a first operating state. If the first voltage is less than or equal to the first voltage threshold, determining that the first drive circuit is in a second operating state.

[0100] In one embodiment, the control method of the motor control system further includes: if the second voltage is less than or equal to a second voltage threshold, controlling a switch of any upper bridge arm in the second drive circuit to be turned on, and controlling other switches in the second drive circuit to be turned off. If the second voltage is greater than the second voltage threshold, determining that the second drive circuit is in the first operating state. If the second voltage is less than or equal to the second voltage threshold, determining that the second drive circuit is in the second operating state.

[0101] In one embodiment, the motor control system further includes a first switch and a second switch, wherein the first node of the first drive circuit is connected to the second end of the input power supply via the first switch, and the first node of the second drive circuit is connected to the second end of the input power supply via the second switch. The control method of the motor control system further includes: controlling the first switch to be off if the first drive circuit is in a first operating state, and controlling the first switch to be on if the first drive circuit is in a second operating state. Controlling the second switch to be off if the second drive circuit is in the first operating state, and controlling the second switch to be on if the second drive circuit is in the second operating state.

[0102] In one embodiment, the motor control system further includes a third switch, wherein the first end of each bridge arm is connected to the first end of the input power supply via the third switch. Before controlling the switches in the first drive circuit and the second drive circuit to be turned on or off, the control method of the motor control system further includes: determining whether the first drive circuit and / or the second drive circuit are abnormal. If the first drive circuit is determined to be abnormal, the first switch is controlled to be turned off and the third switch is controlled to be turned on. If the second drive circuit is determined to be abnormal, the second switch is controlled to be turned off and the third switch is controlled to be turned on.

[0103] In one embodiment, controlling the motor based on the operating states of the first drive circuit and the second drive circuit includes: if the first drive circuit is in the first operating state or the second operating state and the second drive circuit is not abnormal, controlling the first motor to stop operating and controlling the second motor to operate at a first preset power; and if the second drive circuit is in the first operating state or the second operating state and the first drive circuit is not abnormal, controlling the second motor to stop operating and controlling the first motor to operate at the first preset power.

[0104] It should be understood that the specific control of each switch in the motor control system and the beneficial effects produced in the method embodiment can refer to the corresponding description in the above device embodiment, and for the sake of brevity, it will not be repeated here.

[0105] In one embodiment, if Figure 5 As shown, when the motor control system is applied to an electric vehicle, the control unit 23 may include a vehicle control unit (VCU), a high-voltage power distribution unit (PDU) and a motor control unit (MCU), wherein the motor control unit corresponding to the first motor M1 is MCU1, and the motor control unit corresponding to the second motor M2 is MCU2.

[0106] MCU1 is used to detect whether the first drive circuit 21 has any abnormalities and can control the on / off switching of each switch in the first drive circuit 21, as well as the operating power of the first motor M1. MCU2 is used to detect whether the second drive circuit 22 has any abnormalities and can control the on / off switching of each switch in the second drive circuit 22, as well as the operating power of the second motor M2. The VCU obtains information from MCU1 and MCU2 to determine whether the first and second drive circuits 21 and 22 have any abnormalities and can issue corresponding instructions to the PDU, MCU1, and MCU2.

[0107] In practical applications, please refer to Figure 6 If the VCU obtains information from MCU1 and MCU2 that there is no abnormality in the first drive circuit 21 and the second drive circuit 22, the first drive circuit 21 and the second drive circuit 22 are controlled to perform a normal power-on process, and the electric vehicle can travel normally.

[0108] When the VCU detects an abnormality in at least one of the first and second drive circuits 21, 22 through MCU1 and MCU2, it first sends a command to the PDU, instructing it to control the corresponding switches. If the first drive circuit 21 experiences an abnormality, the PDU turns off the first switch S1; if the second drive circuit 22 experiences an abnormality, the PDU turns off the second switch S2. The PDU then turns on the third switch S3 to begin detecting whether the abnormality in the first and / or second drive circuits 21, 22 is a short circuit or an open circuit.

[0109] Furthermore, if an abnormality occurs in the first drive circuit 21, the MCU 1 controls the on / off switching of each switch in the first drive circuit 21 to determine the specific abnormality of the first drive circuit 21. If an abnormality occurs in the second drive circuit 22, the MCU 2 controls the on / off switching of each switch in the second drive circuit 22 to determine the specific abnormality of the second drive circuit 22. The specific implementation process has been described in detail in the above embodiment and will not be repeated here.

[0110] Therefore, if an abnormality occurs in one of the first drive circuit 21 and the second drive circuit 22, the vehicle can enter limp home mode. In limp home mode, the corresponding motor can be driven by the unaffected drive circuit and operated at a first preset power, thereby driving the electric vehicle at a slower speed to a repair point. For example, if an abnormality occurs in the first drive circuit 21, the MCU2 initiates limp home mode and controls the second motor M2 to operate at the first preset power, thereby driving the electric vehicle at a slower speed to a repair point. This helps save users waiting time, brings convenience to users, and improves the convenience of electric vehicles.

[0111] See Figure 7 , which shows a schematic diagram of the structure of a control device of a motor control system provided by an embodiment of the present application. Here, the structure of the motor control system can refer to the above Figures 2 to 3 The detailed description of is omitted here. Figure 7 As shown, the control device 70 of the motor control system includes: a switch control unit 71 and a motor control unit 72.

[0112] The switch control unit 71 is used to control the on or off of switches in the first drive circuit and the second drive circuit to determine the working states of the first drive circuit and the second drive circuit.

[0113] The motor control unit 72 is used to control the motor according to the working states of the first drive circuit and the second drive circuit.

[0114] The above products can be executed Figure 4 The method provided in the embodiment of the present application shown has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in this embodiment, please refer to the method provided in the embodiment of the present application.

[0115] See Figure 8 , which shows a schematic diagram of the structure of the control unit 23 in the motor control system provided in the embodiment of the present application. Figure 8 As shown, the control unit 23 includes one or more processors 231 and a memory 232. Figure 8 A processor 231 is taken as an example.

[0116] The processor 231 and the memory 232 may be connected via a bus or other means. Figure 8 The bus connection is taken as an example.

[0117] The memory 232 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as the program instructions / modules corresponding to the control method of the motor control system in the embodiment of the present application (for example, the attached Figure 7 The processor 231 executes various functional applications and data processing of the control device of the motor control system by running the non-volatile software programs, instructions, and modules stored in the memory 232, that is, implements the control method of the motor control system in the above-mentioned method embodiment and the functions of the various units in the above-mentioned device embodiment.

[0118] The memory 232 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state memory device. In some embodiments, the memory 232 may optionally include a memory remotely located relative to the processor 231, and such remote memory may be connected to the processor 231 via a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0119] The program instructions / modules are stored in the memory 232 and, when executed by the one or more processors 231, execute the control method of the motor control system in any of the above method embodiments, for example, executing the above described Figure 4 The steps shown in the figure can also be implemented in the following Figure 7 The functions of each unit described.

[0120] The present application also provides an electric vehicle, comprising a battery and a motor control system as described in any of the above embodiments, wherein the battery is connected to the motor control system and is used to provide input power to the motor of the motor control system.

[0121] The present application also provides a non-volatile computer storage medium that stores computer executable instructions. The computer executable instructions are executed by one or more processors, which can enable the one or more processors to execute the control method of the motor control system in any of the above method embodiments. For example, executing the above described Figure 4 The steps shown in the figure can also be implemented in the following Figure 7 The functions of each unit described.

[0122] The above-described device or apparatus embodiments are merely illustrative. The unit modules described as separate components may or may not be physically separate, and the components shown as module units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network module units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment.

[0123] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a general hardware platform, or of course, by hardware. Based on this understanding, the above technical solution, in essence, or the part that contributes to the relevant technology, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiment.

[0124] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A motor control system, characterized in that: The motor includes a first motor and a second motor, and the motor control system includes: A first driving circuit, a second driving circuit and a control unit; The first drive circuit is connected to the first motor, the second drive circuit is connected to the second motor, and the control unit is connected to the first drive circuit and the second drive circuit respectively; The control unit is used to control the on or off of switches in the first drive circuit and the second drive circuit to determine the working states of the first drive circuit and the second drive circuit, and control the motor according to the working states of the first drive circuit and the second drive circuit; The first driving circuit and the second driving circuit each include N bridge arms, a first end of each bridge arm is connected to a first end of an input power supply, and a second end of each bridge arm and a second end of the input power supply are connected to a first node, wherein N is a positive integer; The control unit is further configured to: Controlling the on or off of the switch in the bridge arm and obtaining the voltage of the first node; determining, according to the voltage of the first node, operating states of the first driving circuit and the second driving circuit, wherein the operating states include a first operating state and a second operating state; The motor control system further includes a first switch and a second switch, wherein the first node of the first drive circuit is connected to the second end of the input power supply via the first switch, and the first node of the second drive circuit is connected to the second end of the input power supply via the second switch; The control unit is connected to the first switch and the second switch respectively, and the control unit is specifically configured to: If the first drive circuit is in the first working state, the first switch is controlled to be turned off; if the first drive circuit is in the second working state, the first switch is controlled to be turned on; If the second drive circuit is in the first working state, the second switch is controlled to be turned off; if the second drive circuit is in the second working state, the second switch is controlled to be turned on.

2. The motor control system according to claim 1, characterized in that: Any of the bridge arms includes an upper bridge arm and a lower bridge arm, and the connection point between the upper bridge arm and the lower bridge arm is a midpoint, wherein the midpoint of the first drive circuit is used to connect to the first motor, and the midpoint of the second drive circuit is used to connect to the second motor; The control unit is further configured to: Controlling any switch of the lower bridge arm to turn on, and controlling the other switches to turn off; If the first voltage of the first node of the first driving circuit is greater than a first voltage threshold, determining that the first driving circuit is in the first working state; If the second voltage of the first node of the second driving circuit is greater than a second voltage threshold, it is determined that the second driving circuit is in the first working state.

3. The motor control system according to claim 2, characterized in that: The control unit is further configured to: If the first voltage is less than or equal to the first voltage threshold, controlling a switch of any upper bridge arm in the first drive circuit to be turned on, and controlling other switches in the first drive circuit to be turned off; If the first voltage is greater than the first voltage threshold, determining that the first driving circuit is in the first working state; If the first voltage is less than or equal to the first voltage threshold, it is determined that the first driving circuit is in the second working state.

4. The motor control system according to claim 2, characterized in that: The control unit is further configured to: If the second voltage is less than or equal to the second voltage threshold, controlling a switch of any upper bridge arm in the second drive circuit to be turned on, and controlling other switches in the second drive circuit to be turned off; If the second voltage is greater than the second voltage threshold, determining that the second driving circuit is in the first working state; If the second voltage is less than or equal to the second voltage threshold, it is determined that the second driving circuit is in the second working state.

5. The motor control system according to claim 1, characterized in that: The motor control system further includes a third switch, wherein the first end of any bridge arm is connected to the first end of the input power supply via the third switch. Before controlling the on or off of the switches in the first drive circuit and the second drive circuit, the control unit is further configured to: determining whether the first drive circuit and / or the second drive circuit are abnormal; If it is determined that the first drive circuit is abnormal, controlling the first switch to be turned off and controlling the third switch to be turned on; If it is determined that the second driving circuit is abnormal, the second switch is controlled to be turned off, and the third switch is controlled to be turned on.

6. The motor control system according to claim 5, characterized in that: The control unit is further configured to: If the first drive circuit is in the first working state or the second working state, and the second drive circuit has no abnormality, the first motor is controlled to stop running, and the second motor is controlled to run at a first preset power; If the second drive circuit is in the first working state or the second working state and there is no abnormality in the first drive circuit, the second motor is controlled to stop running, and the first motor is controlled to run at the first preset power.

7. A control method for a motor control system implemented using the system according to any one of claims 1 to 6, characterized in that: The motor includes a first motor and a second motor, the motor control system includes a first drive circuit and a second drive circuit, the first drive circuit is connected to the first motor, and the second drive circuit is connected to the second motor; the method includes: Controlling the on or off of switches in the first drive circuit and the second drive circuit to determine the operating states of the first drive circuit and the second drive circuit; The motor is controlled according to the working states of the first drive circuit and the second drive circuit.

8. The method according to claim 7, characterized in that The first driving circuit and the second driving circuit each include N bridge arms, a first end of each bridge arm is connected to a first end of an input power supply, and a second end of each bridge arm and a second end of the input power supply are connected to a first node, wherein N is a positive integer; The controlling the on or off of switches in the first drive circuit and the second drive circuit to determine the working states of the first drive circuit and the second drive circuit includes: The switch in the bridge arm is controlled to be turned on or off, and the working state of the first drive circuit and the second drive circuit is determined according to the voltage of the first node, wherein the working state includes a first working state and a second working state.

9. The method according to claim 8, characterized in that Any of the bridge arms includes an upper bridge arm and a lower bridge arm, and the connection point between the upper bridge arm and the lower bridge arm is a midpoint, wherein the midpoint of the first drive circuit is used to connect to the first motor, and the midpoint of the second drive circuit is used to connect to the second motor; The controlling the on or off of the switch in the bridge arm and determining the working states of the first drive circuit and the second drive circuit according to the voltage of the first node includes: Controlling any switch of the lower bridge arm to turn on, and controlling the other switches to turn off; If the first voltage of the first node of the first driving circuit is greater than a first voltage threshold, determining that the first driving circuit is in the first working state; If the second voltage of the first node of the second driving circuit is greater than a second voltage threshold, it is determined that the second driving circuit is in the first working state.

10. The method according to claim 9, characterized in that The method further comprises: If the first voltage is less than or equal to the first voltage threshold, controlling a switch of any upper bridge arm in the first drive circuit to be turned on, and controlling other switches in the first drive circuit to be turned off; If the first voltage is greater than the first voltage threshold, determining that the first driving circuit is in the first working state; If the first voltage is less than or equal to the first voltage threshold, it is determined that the first driving circuit is in the second working state.

11. The method according to claim 9, characterized in that The method further comprises: If the second voltage is less than or equal to the second voltage threshold, controlling a switch of any upper bridge arm in the second drive circuit to be turned on, and controlling other switches in the second drive circuit to be turned off; If the second voltage is greater than the second voltage threshold, determining that the second driving circuit is in the first working state; If the second voltage is less than or equal to the second voltage threshold, it is determined that the second driving circuit is in the second working state.

12. The method according to claim 9, characterized in that The motor control system further includes a first switch and a second switch, wherein the first node of the first drive circuit is connected to the second end of the input power supply via the first switch, and the first node of the second drive circuit is connected to the second end of the input power supply via the second switch; and the method further includes: If the first drive circuit is in the first working state, the first switch is controlled to be turned off; if the first drive circuit is in the second working state, the first switch is controlled to be turned on; If the second drive circuit is in the first working state, the second switch is controlled to be turned off; if the second drive circuit is in the second working state, the second switch is controlled to be turned on.

13. The method according to claim 12, characterized in that The motor control system further includes a third switch, and the first end of each bridge arm is connected to the first end of the input power supply via the third switch. Before controlling the on or off of the switches in the first drive circuit and the second drive circuit, the method further includes: determining whether the first drive circuit and / or the second drive circuit are abnormal; If it is determined that the first drive circuit is abnormal, controlling the first switch to be turned off and controlling the third switch to be turned on; If it is determined that the second driving circuit is abnormal, the second switch is controlled to be turned off, and the third switch is controlled to be turned on.

14. The method according to claim 13, characterized in that The controlling the motor according to the working states of the first drive circuit and the second drive circuit includes: If the first drive circuit is in the first working state or the second working state, and the second drive circuit has no abnormality, the first motor is controlled to stop running, and the second motor is controlled to run at a first preset power; If the second drive circuit is in the first working state or the second working state and there is no abnormality in the first drive circuit, the second motor is controlled to stop running, and the first motor is controlled to run at the first preset power.

15. A control device for a motor control system implemented using the system according to any one of claims 1 to 6, characterized in that: The motor includes a first motor and a second motor, and the motor control system includes a first drive circuit and a second drive circuit, wherein the first drive circuit is connected to the first motor and the second drive circuit is connected to the second motor; the device includes: a switch control unit, configured to control the on or off of switches in the first drive circuit and the second drive circuit to determine the operating states of the first drive circuit and the second drive circuit; A motor control unit is used to control the motor according to the working status of the first drive circuit and the second drive circuit.

16. An electric vehicle, characterized in that: comprising a battery and a motor control system according to any one of claims 1 to 6; The battery is connected to the motor control system, and is used to provide input power to the motor controlled motor.

17. A computer-readable storage medium comprising: Computer-executable instructions are stored, and the computer-executable instructions are configured as a method flow according to any one of claims 7 to 14.

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