Protection control method and device of motor controller in low voltage state, medium and equipment

Abstract

The application discloses a protection control method and device of a motor controller in a low-voltage state, a medium and equipment. The motor controller method comprises the following steps: in the case that a power battery of a vehicle is in a low-voltage state, controlling power electronic switching devices of a motor controller to be turned on, so that the motor controller is in an open tube state; in the case that the motor controller is in the open tube state and a bus voltage at a current moment is less than a preset first voltage threshold, controlling output power of a motor in the vehicle to be reduced by a preset value, so that the motor is output at a reduced capacity; and controlling an engine to operate according to a target motor rotating speed of the motor output at the reduced capacity. Therefore, by adopting the application, the motor can be prevented from being out of control and back electromotive force from being generated, so that a DC-DC converter is protected from damage, and reliable operation of the vehicle under a low-voltage condition is ensured.

Description

Technical Field

[0001] This application relates to the field of vehicle control technology, and in particular to a protection control method, device, medium and equipment for a motor controller under low voltage conditions. Background Technology

[0002] In the design of modern electric vehicles (EVs) and hybrid electric vehicles (HEVs), the integration of motor controllers (MCUs) with DC-DC converters (DCDCs) has become a key technology for improving space utilization and system efficiency. This integrated two-in-one controller provides motor drive and voltage conversion functions within a limited space to meet the compact design requirements of vehicle powertrains.

[0003] In related technologies, existing dual-in-one controllers typically include a motor controller (MCU) for controlling the operation of a permanent magnet synchronous motor (PMSM) and a DC-DC converter for converting high-voltage DC to low-voltage DC for the device's use. Under normal operating conditions, the MCU can respond to commands from an external controller and regulate the motor's speed and torque by controlling power electronic switching devices such as IGBTs.

[0004] However, when the battery charge decreases, causing a drop in bus voltage, the MCU may shut down due to an undervoltage fault, resulting in loss of motor control and the generation of excessive back electromotive force (EMF). This back EMF can damage the DC-DC converter, affecting the vehicle's safety and reliability. Summary of the Invention

[0005] This application provides a protection control method, apparatus, medium, and device for a motor controller under low voltage conditions. To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general description, nor is it intended to identify key / important components or describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

[0006] In a first aspect, embodiments of this application provide a protection control method for a motor controller under low voltage conditions, applied to a motor controller, the method comprising:

[0007] When the vehicle's power battery is in a low-voltage state, the power electronic switching device of the motor controller is turned on, so that the motor controller is in the open state.

[0008] When the motor controller is in the open state and the current bus voltage is less than the preset first voltage threshold, the output power of the motor in the vehicle is reduced by a preset value so that the motor outputs at a reduced rate.

[0009] The engine operation is controlled based on the target motor speed of the dated motor output.

[0010] Optionally, before the power electronic switching devices of the motor controller are turned on, the following steps are also included:

[0011] Obtain the current bus voltage and motor speed;

[0012] If the bus voltage at the current moment is less than the preset second voltage threshold, it is determined that the vehicle's power battery is in a low-voltage state; the preset second voltage threshold is greater than the preset first voltage threshold.

[0013] Optionally, the method also includes:

[0014] If the motor controller is in the open state and the current bus voltage is greater than or equal to the preset first voltage threshold, the step of controlling the power electronic switching device of the motor controller to turn on continues to be executed so that the motor controller is in the open state.

[0015] Optionally, the engine operation is controlled according to the target motor speed based on the dated output of the motor, including:

[0016] Receives the tube opening signal sent by an external controller;

[0017] When the target motor speed is less than the preset first speed threshold, in response to the opening signal, the motor is controlled to maintain the running state and the timer is started.

[0018] If the system continuously receives a tube-opening signal from an external controller during the timed period, a fault alarm message will be issued.

[0019] Optionally, the method also includes:

[0020] If the target motor speed is greater than or equal to the preset first speed threshold, continue to execute the step of reducing the output power of the motor in the vehicle by a preset value.

[0021] Optionally, the method also includes:

[0022] In response to a shutdown request sent by an external controller, the power electronic switching devices of the motor controller are turned off to stop the engine from running.

[0023] Optionally, the method also includes:

[0024] If the bus voltage is greater than the preset third voltage threshold or the motor speed is less than the preset second speed threshold at the current moment, the vehicle's power battery is determined to be in normal condition.

[0025] When the vehicle's power battery is in normal condition, it receives the opening signal sent by the external controller.

[0026] If there is no fault in the vehicle's power supply system, it responds to the open signal; or if there is a fault in the vehicle's power supply system, it does not respond to the open signal.

[0027] Among them, the preset third voltage threshold is greater than the preset second voltage threshold, and the preset second speed threshold is less than the preset first speed threshold.

[0028] Secondly, embodiments of this application provide a protection control device for a motor controller under low voltage conditions, the device comprising:

[0029] The open-circuit state control module is used to control the power electronic switching devices of the motor controller to turn on when the vehicle's power battery is in a low-voltage state, so that the motor controller is in the open-circuit state.

[0030] The motor derating control module is used to control the output power of the motor in the vehicle to be reduced by a preset value when the motor controller is in the open state and the current bus voltage is less than a preset first voltage threshold, so as to reduce the output power of the motor by a preset value.

[0031] The engine operation control module is used to control the engine operation based on the target motor speed of the dated motor output.

[0032] Thirdly, embodiments of this application provide a computer storage medium storing multiple instructions adapted for loading and execution of the above-described method steps by a processor.

[0033] Fourthly, embodiments of this application provide an apparatus that may include: a processor and a memory; wherein the memory stores a computer program adapted to be loaded by the processor and to execute the above-described method steps.

[0034] The technical solutions provided in this application embodiment may include the following beneficial effects:

[0035] In this embodiment, when the vehicle's power battery is in a low-voltage state, the motor controller is turned on by controlling the power electronic switching device of the motor controller to put the motor controller in an open state. At the same time, the motor is controlled to derating output, which can prevent motor runaway and the generation of back electromotive force, thereby protecting the DC-DC converter from damage and ensuring reliable operation of the vehicle under low-voltage conditions.

[0036] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0038] Figure 1 This is a flowchart illustrating a protection control method for a motor controller under low voltage conditions provided in an embodiment of this application.

[0039] Figure 2 This is a flowchart illustrating the protection and control process of a motor controller under low voltage conditions provided in this application.

[0040] Figure 3 This is a schematic diagram of the structure of a protection control device for a motor controller under low voltage conditions provided in an embodiment of this application;

[0041] Figure 4 This is a schematic diagram of the structure of a device provided in an embodiment of this application. Detailed Implementation

[0042] The following description and accompanying drawings fully illustrate specific embodiments of this application to enable those skilled in the art to practice them.

[0043] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0044] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0045] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0046] This application provides a protection control method, device, medium, and equipment for a motor controller under low voltage conditions to solve the problems existing in the aforementioned related technologies. In the embodiments of this application, when the vehicle's power battery is in a low-voltage state, by controlling the power electronic switching device of the motor controller to turn on, the motor controller is put into an open state. At the same time, the motor's derating output is controlled, which can prevent motor runaway and the generation of back electromotive force, thereby protecting the DC-DC converter from damage and ensuring the reliable operation of the vehicle under low voltage conditions. The following is a detailed description using exemplary embodiments.

[0047] The following will be combined with the appendix Figure 1 - Appendix Figure 2 This application provides a detailed description of the protection and control method for a motor controller under low voltage conditions, as provided in the embodiments of this application. This method can be implemented using a computer program and can run on a protection and control device for a motor controller under low voltage conditions based on the von Neumann architecture. The computer program can be integrated into the application or run as a standalone utility application.

[0048] Please see Figure 1 This is a flowchart illustrating a protection control method for a motor controller under low voltage conditions, as provided in this application embodiment, and is applied to a motor controller. Figure 1 As shown, the method in this application embodiment may include the following steps:

[0049] S101, when the vehicle's power battery is in a low-voltage state, controls the power electronic switching device of the motor controller to turn on, so that the motor controller is in an open state.

[0050] In this context, a power battery refers to a battery pack that provides electrical energy to an electric vehicle. It typically consists of multiple battery cells to provide the required voltage and capacity. A low-voltage state refers to a power battery voltage dropping to a relatively low level. A motor controller (MCU) is a device used to control the operation of a motor, including its speed, torque, and direction. It controls the motor by adjusting the switching states of power electronic switching devices. An open state refers to the power electronic switching devices being in a conducting state, allowing current to flow.

[0051] In some embodiments of this application, during the operation of an electric vehicle, the voltage of its power battery gradually decreases due to prolonged use. When the battery voltage drops to a preset low-voltage threshold, the motor controller (MCU) detects this change and enters a low-voltage protection mode. In this mode, the MCU sends a signal to the power electronic switching device (such as an IGBT) through its internal control logic, causing it to turn on. This results in the motor controller being in an open state, allowing current to continue flowing to the motor, thus maintaining motor operation even when the battery voltage is low.

[0052] For example, if the preset low voltage threshold is 300 volts, the MCU will control the power electronic switching devices of the motor controller to turn on when the battery voltage drops to 295 volts.

[0053] In some embodiments of this application, the following process is specifically performed before the power electronic switching device of the motor controller is turned on: obtaining the current bus voltage and motor speed; determining that the vehicle's power battery is in a low-voltage state if the current bus voltage is less than a preset second voltage threshold; and the preset second voltage threshold is greater than a preset first voltage threshold.

[0054] Bus voltage refers to the voltage level on the bus in a power system, which is the main conductor used to distribute electrical energy. In electric vehicles, bus voltage refers to the voltage supplied by the battery pack. Motor speed refers to the speed at which the motor rotates, usually measured in revolutions per minute (RPM). The preset voltage threshold is a pre-set voltage value used to determine whether the battery voltage is in a normal or low-voltage state. The preset second voltage threshold is a specific voltage value used to determine whether the power battery is in a low-voltage state. This value is greater than the preset first voltage threshold, which is used to determine the lower limit of the normal operating voltage.

[0055] For example, the motor controller (MCU) of an electric vehicle monitors the bus voltage and motor speed in real time. The MCU first obtains the current bus voltage and motor speed. For example, the current bus voltage is 350 volts and the motor speed is 2000 RPM. The MCU compares the obtained bus voltage with preset voltage thresholds. Assume the preset first voltage threshold is 300 volts and the preset second voltage threshold is 360 volts. If the current bus voltage (295 volts) is less than the preset second voltage threshold (360 volts), it is determined to be a low-voltage state. At this time, the power electronic switching device of the motor controller is turned on, so that the motor controller is in the open state.

[0056] S102, when the motor controller is in the open state and the current bus voltage is less than the preset first voltage threshold, control the output power of the motor in the vehicle to reduce by a preset value so that the motor outputs at a reduced rate.

[0057] In some embodiments of this application, when the motor controller is in the open state and the current bus voltage is less than a preset first voltage threshold, the output power of the motor in the vehicle is reduced by a preset value to reduce the output of the motor; or when the motor controller is in the open state and the current bus voltage is greater than or equal to the preset first voltage threshold, the step of controlling the power electronic switching device of the motor controller to turn on is continued to be executed to keep the motor controller in the open state.

[0058] For example, if the MCU is in the ON state, meaning the power electronic switching devices are turned on, allowing current to flow to the motor, and if the current bus voltage of 295 is lower than a preset first voltage threshold of 300 volts, the MCU will reduce the motor's output power by a preset value, for example, from 100 kW to 70 kW, to protect the battery and motor, achieving derating output. Alternatively, if the current bus voltage of 295 is greater than or equal to the preset first voltage threshold of 300 volts, i.e., between the preset first voltage threshold of 300 volts and a preset second voltage threshold (360 volts), the MCU will continue to execute the step of controlling the power electronic switching devices to turn on, keeping the motor controller in the ON state and allowing the motor to operate at normal power.

[0059] S103 controls the engine operation based on the target motor speed of the dated motor output.

[0060] In some embodiments of this application, the specific process of controlling the engine operation based on the target motor speed output by the dated motor includes: receiving a pipe opening signal sent by an external controller; when the target motor speed is less than a preset first speed threshold, responding to the pipe opening signal, controlling the motor to maintain the running state and starting a timer; and issuing a fault alarm message when the pipe opening signal is continuously received from the external controller during the timed period.

[0061] In some embodiments, if the target motor speed is greater than or equal to a preset first speed threshold, the step of controlling the output power of the motor in the vehicle to decrease by a preset value continues.

[0062] In some embodiments, in response to a shutdown request sent by an external controller, the power electronic switching devices of the motor controller are turned off to stop the engine.

[0063] In some embodiments, if the bus voltage at the current moment is greater than a preset third voltage threshold or the motor speed is less than a preset second speed threshold, it is determined that the vehicle's power battery is in a normal state; if the vehicle's power battery is in a normal state, a power supply opening signal sent by an external controller is received; if there is no fault in the vehicle's power supply system, the power supply opening signal is responded to; or if there is a fault in the vehicle's power supply system, the power supply opening signal is not responded to; wherein, the preset third voltage threshold is greater than the preset second voltage threshold, and the preset second speed threshold is less than the preset first speed threshold.

[0064] For example, the MCU receives a power-on signal from an external controller. If the target motor speed is lower than a preset first speed threshold (e.g., 1000 RPM), the MCU responds to the power-on signal, keeps the motor running, and starts a timer.

[0065] If the MCU continuously receives the switching signal during the timer's operation, but the motor speed fails to reach the target value, the MCU will issue a fault alarm message.

[0066] If the target motor speed reaches or exceeds the preset first speed threshold, the MCU will continue to execute the step of reducing the motor output power.

[0067] If the MCU receives a shutdown request from an external controller, it will control the power electronic switching devices to turn off and stop the motor from running.

[0068] If the current bus voltage is higher than a preset third voltage threshold (e.g., 420 volts), or the motor speed is lower than a preset second speed threshold (e.g., 500 RPM), the MCU determines that the power battery is in a normal state. In a normal power battery state, the MCU receives and responds to the power supply system's power-on signal from the external controller. If the power supply system is fault-free, the MCU will respond to the power-on signal; if there is a fault, the MCU will not respond.

[0069] For example Figure 2 As shown, if the bus voltage at the current moment is greater than a preset third voltage threshold or the motor speed is less than a preset second speed threshold, the vehicle's power battery is determined to be in a normal state; if the bus voltage at the current moment is less than the preset second voltage threshold, the vehicle's power battery is determined to be in a low-voltage state. The preset third voltage threshold is greater than the preset second voltage threshold. When the vehicle's power battery is in a normal state, it receives an opening signal from an external controller; if there is no fault in the vehicle's power supply system, it responds to the opening signal; or if there is a fault in the vehicle's power supply system, it does not respond to the opening signal. When the vehicle's power battery is in a low-voltage state, it controls the power electronic switching device of the motor controller to turn on, so that the motor controller is in an open state; if the motor controller is in an open state and the bus voltage at the current moment is less than a preset first voltage threshold, it controls the output power of the motor in the vehicle to decrease by a preset value, so that the motor outputs at a reduced rate; the preset second voltage threshold is greater than the preset first voltage threshold. If the motor controller is in an open state and the bus voltage at the current moment is greater than or equal to the preset first voltage threshold, it continues to execute the step of controlling the power electronic switching device of the motor controller to turn on, so that the motor controller is in an open state. Receives the opening signal from the external controller; when the target motor speed is less than the preset first speed threshold, responds to the opening signal, controls the motor to maintain operation, and starts the timer; if the opening signal from the external controller is continuously received during the timed period, a fault alarm message is issued.

[0070] In this embodiment, when the vehicle's power battery is in a low-voltage state, the motor controller is turned on by controlling the power electronic switching device of the motor controller to put the motor controller in an open state. At the same time, the motor is controlled to derating output, which can prevent motor runaway and the generation of back electromotive force, thereby protecting the DC-DC converter from damage and ensuring reliable operation of the vehicle under low-voltage conditions.

[0071] The following are embodiments of the apparatus described in this application, which can be used to execute the embodiments of the method described in this application. For details not disclosed in the apparatus embodiments of this application, please refer to the embodiments of the method described in this application.

[0072] Please see Figure 3 This illustration shows a schematic diagram of a protection control device for a motor controller under low voltage conditions, provided in an exemplary embodiment of this application. This protection control device for the motor controller under low voltage conditions can be implemented as all or part of the device through software, hardware, or a combination of both. The device 1 includes an open-circuit state control module 10, a motor derating control module 20, and an engine operation control module 30.

[0073] The open-circuit state control module 10 is used to control the power electronic switching device of the motor controller to open when the vehicle's power battery is in a low-voltage state, so that the motor controller is in the open-circuit state.

[0074] The motor derating control module 20 is used to control the output power of the motor in the vehicle to be reduced by a preset value when the motor controller is in the open state and the current bus voltage is less than a preset first voltage threshold, so as to reduce the output power of the motor by a preset value.

[0075] The engine operation control module 30 is used to control the engine operation according to the target motor speed of the dated output motor.

[0076] It should be noted that the protection and control device for the motor controller under low voltage conditions provided in the above embodiments is only illustrated by the division of the above functional modules when executing the protection and control method for the motor controller under low voltage conditions. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the equipment can be divided into different functional modules to complete all or part of the functions described above. In addition, the protection and control device for the motor controller under low voltage conditions and the protection and control method embodiment for the motor controller under low voltage conditions provided in the above embodiments belong to the same concept, and the implementation process is detailed in the method embodiment, which will not be repeated here.

[0077] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0078] In this embodiment, when the vehicle's power battery is in a low-voltage state, the motor controller is turned on by controlling the power electronic switching device of the motor controller to put the motor controller in an open state. At the same time, the motor is controlled to derating output, which can prevent motor runaway and the generation of back electromotive force, thereby protecting the DC-DC converter from damage and ensuring reliable operation of the vehicle under low-voltage conditions.

[0079] This application also provides a computer-readable medium having program instructions stored thereon, which, when executed by a processor, implement the protection control method for a motor controller under low voltage conditions provided in the above-described method embodiments.

[0080] This application also provides a computer program product containing instructions that, when run on a computer, causes the computer to execute the protection control method of the motor controller under low voltage conditions in the above-described method embodiments.

[0081] Please see Figure 4 This is a schematic diagram of the structure of a device provided in an embodiment of this application. Figure 4 As shown, device 1000 may include: at least one processor 1001, at least one network interface 1004, user interface 1003, memory 1005, and at least one communication bus 1002.

[0082] The communication bus 1002 is used to realize the connection and communication between these components.

[0083] The user interface 1003 may include a display screen and a camera. Optionally, the user interface 1003 may also include a standard wired interface and a wireless interface.

[0084] The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface).

[0085] The processor 1001 may include one or more processing cores. The processor 1001 connects to various parts within the device 1000 using various interfaces and lines, and performs various functions and processes data by running or executing instructions, programs, code sets, or instruction sets stored in the memory 1005, and by calling data stored in the memory 1005. Optionally, the processor 1001 may be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 1001 may integrate one or a combination of several of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), and modem. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the content required for display on the screen; and the modem handles wireless communication. It is understood that the modem may also not be integrated into the processor 1001 and may be implemented as a separate chip.

[0086] The memory 1005 may include random access memory (RAM) or read-only memory. Optionally, the memory 1005 may include a non-transitory computer-readable storage medium. The memory 1005 can be used to store instructions, programs, code, code sets, or instruction sets. The memory 1005 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as touch function, sound playback function, image playback function, etc.), instructions for implementing the above-described method embodiments, etc.; the data storage area may store data involved in the above-described method embodiments, etc. Optionally, the memory 1005 may also be at least one storage system located remotely from the aforementioned processor 1001. Figure 4 As shown, the memory 1005, which serves as a computer storage medium, may include an operating system, a network communication module, a user interface module, and a protection and control application for the motor controller under low voltage conditions.

[0087] exist Figure 4In the device 1000 shown, the user interface 1003 is mainly used to provide an input interface for the user and to obtain the user input data; while the processor 1001 can be used to call the protection control application of the motor controller in the low voltage state stored in the memory 1005, and specifically perform the following operations:

[0088] When the vehicle's power battery is in a low-voltage state, the power electronic switching device of the motor controller is turned on, so that the motor controller is in the open state.

[0089] When the motor controller is in the open state and the current bus voltage is less than the preset first voltage threshold, the output power of the motor in the vehicle is reduced by a preset value so that the motor outputs at a reduced rate.

[0090] The engine operation is controlled based on the target motor speed of the dated motor output.

[0091] In one embodiment, before the processor 1001 activates the power electronic switching devices of the motor controller, it specifically performs the following operations:

[0092] Obtain the current bus voltage and motor speed;

[0093] If the bus voltage at the current moment is less than the preset second voltage threshold, it is determined that the vehicle's power battery is in a low-voltage state; the preset second voltage threshold is greater than the preset first voltage threshold.

[0094] In one embodiment, the processor 1001 also performs the following operations:

[0095] If the motor controller is in the open state and the current bus voltage is greater than or equal to the preset first voltage threshold, the step of controlling the power electronic switching device of the motor controller to turn on continues to be executed so that the motor controller is in the open state.

[0096] In one embodiment, when the processor 1001 controls the engine operation based on the target motor speed output by the dated motor speed, it specifically performs the following operations:

[0097] Receives the tube opening signal sent by an external controller;

[0098] When the target motor speed is less than the preset first speed threshold, in response to the opening signal, the motor is controlled to maintain the running state and the timer is started.

[0099] If the system continuously receives a tube-opening signal from an external controller during the timed period, a fault alarm message will be issued.

[0100] In one embodiment, the processor 1001 also performs the following operations:

[0101] If the target motor speed is greater than or equal to the preset first speed threshold, continue to execute the step of reducing the output power of the motor in the vehicle by a preset value.

[0102] In one embodiment, the processor 1001 also performs the following operations:

[0103] In response to a shutdown request sent by an external controller, the power electronic switching devices of the motor controller are turned off to stop the engine from running.

[0104] In one embodiment, the processor 1001 also performs the following operations:

[0105] If the bus voltage is greater than the preset third voltage threshold or the motor speed is less than the preset second speed threshold at the current moment, the vehicle's power battery is determined to be in normal condition.

[0106] When the vehicle's power battery is in normal condition, it receives the opening signal sent by the external controller.

[0107] If there is no fault in the vehicle's power supply system, it responds to the open signal; or if there is a fault in the vehicle's power supply system, it does not respond to the open signal.

[0108] Among them, the preset third voltage threshold is greater than the preset second voltage threshold, and the preset second speed threshold is less than the preset first speed threshold.

[0109] In this embodiment, when the vehicle's power battery is in a low-voltage state, the motor controller is turned on by controlling the power electronic switching device of the motor controller to put the motor controller in an open state. At the same time, the motor is controlled to derating output, which can prevent motor runaway and the generation of back electromotive force, thereby protecting the DC-DC converter from damage and ensuring reliable operation of the vehicle under low-voltage conditions.

[0110] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The protection control program for the motor controller under low voltage conditions can be stored in a computer-readable storage medium. When executed, this program can include the processes of the embodiments of the above methods. The storage medium for the protection control program for the motor controller under low voltage conditions can be a magnetic disk, optical disk, read-only memory, or random access memory, etc.

[0111] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A protection control method for a motor controller under low voltage conditions, characterized in that, Applied to a motor controller, the method includes: When the vehicle's power battery is in a low-voltage state, the power electronic switching device of the motor controller is turned on, so that the motor controller is in an open state. When the motor controller is in the open state and the current bus voltage is less than a preset first voltage threshold, the output power of the motor in the vehicle is reduced by a preset value so that the motor outputs at a reduced rate. The engine operation is controlled based on the target motor speed output by the dated motor; Before the power electronic switching device controlling the motor controller is turned on, the system further includes: Obtain the current bus voltage and motor speed; If the bus voltage at the current moment is less than a preset second voltage threshold, it is determined that the vehicle's power battery is in a low-voltage state; the preset second voltage threshold is greater than the preset first voltage threshold. The step of controlling engine operation based on the target motor speed output by the dated motor includes: Receives the tube opening signal sent by an external controller; When the target motor speed is less than a preset first speed threshold, in response to the opening signal, the motor is controlled to maintain the running state and the timer is started; If a tube-opening signal is continuously received from an external controller during the timing period, a fault alarm message will be issued. The method further includes: If the bus voltage at the current moment is greater than a preset third voltage threshold or the motor speed is less than a preset second speed threshold, the vehicle's power battery is determined to be in a normal state. When the vehicle's power battery is in normal condition, it receives an opening signal from an external controller. If there is no fault in the vehicle's power supply system, the system responds to the opening signal; or if there is a fault in the vehicle's power supply system, the system does not respond to the opening signal. Wherein, the preset third voltage threshold is greater than the preset second voltage threshold, and the preset second speed threshold is less than the preset first speed threshold.

2. The method according to claim 1, characterized in that, The method further includes: If the motor controller is in the open state and the current bus voltage is greater than or equal to a preset first voltage threshold, the step of controlling the power electronic switching device of the motor controller to turn on continues to be executed, so that the motor controller is in the open state.

3. The method according to claim 1, characterized in that, The method further includes: If the target motor speed is greater than or equal to a preset first speed threshold, the step of reducing the output power of the motor in the controlled vehicle by a preset value continues.

4. The method according to claim 1, characterized in that, The method further includes: In response to a shutdown request sent by an external controller, the power electronic switching devices of the motor controller are turned off to stop the engine from running.

5. A protection control device for a motor controller under low voltage conditions implemented using the method described in any one of claims 1-4, characterized in that, The device includes: The open-circuit state control module is used to control the power electronic switching device of the motor controller to turn on when the vehicle's power battery is in a low-voltage state, so that the motor controller is in the open-circuit state. The motor derating control module is used to control the output power of the motor in the vehicle to decrease by a preset value when the motor controller is in the open state and the current bus voltage is less than a preset first voltage threshold, so as to reduce the output power of the motor by a preset value. The engine operation control module is used to control the engine operation according to the target motor speed output by the dated motor.

6. A computer storage medium, characterized in that, The computer storage medium stores a plurality of instructions adapted for loading by a processor and executing the method as described in any one of claims 1-4.

7. An electronic device, characterized in that, include: A processor and a memory; wherein the memory stores a computer program adapted to be loaded by the processor and executed as described in any one of claims 1-4.

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