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

Abstract

The invention discloses a protection control method and device for a motor controller in a low-voltage state, a medium and equipment, and the method for the motor controller comprises the steps: controlling a power electronic switching device of the motor controller to be turned on under the condition that a power battery of a vehicle is in a low-voltage state, so as to enable the motor controller to be in an open state; under the condition that the motor controller is in an open state and the bus voltage at the current moment is smaller than a preset first voltage threshold value, the output power of a motor in the vehicle is controlled to be reduced by a preset value, so that derated output of the motor is achieved; and controlling the engine to operate according to the target motor rotating speed output by motor derating. Therefore, by adopting the embodiment of the invention, the out-of-control of the motor and the generation of back electromotive force can be prevented, so that the direct current-direct current converter is protected from being damaged, and the reliable operation of the vehicle under a low-voltage condition is ensured.

Description

Technical Field

[0001] The present 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 a low voltage state. Background Art

[0002] In the design of modern electric vehicles (EV) and hybrid electric vehicles (HEV), the integration of motor controllers (MCU) and DC-DC converters (DCDC) has become a key technology to improve space utilization and system efficiency. This integrated two-in-one controller provides the functions of motor drive and voltage conversion in a limited space to meet the compact design requirements of vehicle power systems.

[0003] In the related art, the existing two-in-one controller usually includes a motor controller (MCU) for controlling the operation of the permanent magnet synchronous motor (PMSM), and a DCDC converter for converting high-voltage DC power into low-voltage DC power for use by the device. Under normal working conditions, the MCU can respond to the instructions of the external controller and adjust the speed and torque of the motor by controlling power electronic switching devices such as IGBT.

[0004] However, when the power battery is reduced and the bus voltage decreases, the MCU may shut down due to undervoltage fault, causing the motor to lose control and generate excessive back EMF, which may damage the DCDC converter and affect the safety and reliability of the vehicle. Summary of the invention

[0005] The embodiments of the present application provide a protection control method, device, medium and equipment for a motor controller under a low voltage state. In order to have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important components or describe the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

[0006] In a first aspect, an embodiment of the present application provides a protection control method for a motor controller in a low voltage state, which is applied to the motor controller, and the method includes:

[0007] When the power battery of the vehicle is in a low voltage state, the power electronic switch device of the motor controller is controlled to be turned on, so that the motor controller is in an open-tube state;

[0008] When the motor controller is in an open-tube state and the bus voltage at the current moment is less than a preset first voltage threshold, controlling the output power of the motor in the vehicle to be reduced by a preset value so as to reduce the output of the motor;

[0009] The engine operation is controlled according to the target motor speed of the motor derating output.

[0010] Optionally, before the power electronic switch device controlling the motor controller is turned on, the method further includes:

[0011] Get the bus voltage and motor speed at the current moment;

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

[0013] Optionally, the method further includes:

[0014] When the motor controller is in the open state and the bus voltage at the current moment is greater than or equal to the preset first voltage threshold, continue to execute the step of controlling the power electronic switch device of the motor controller to turn on, so that the motor controller is in the open state.

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

[0016] Receive a tube opening signal sent by an external controller;

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

[0018] When the open-tube signal sent by the external controller is continuously received within the timing period, a fault alarm message is issued.

[0019] Optionally, the method further includes:

[0020] When 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 reduce a preset value is continued.

[0021] Optionally, the method further includes:

[0022] In response to a shutdown request sent by an external controller, a power electronic switch device of a motor controller is controlled to be turned off to stop the engine.

[0023] Optionally, the method further includes:

[0024] When 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, determining that the power battery of the vehicle is in a normal state;

[0025] When the power battery of the vehicle is in a normal state, receiving an open-tube signal sent by an external controller;

[0026] In the case that there is no fault in the power supply system of the vehicle, responding to the pipe opening signal; or in the case that there is a fault in the power supply system of the vehicle, not responding to the pipe opening signal;

[0027] 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] In a second aspect, an embodiment of the present application provides a protection control device for a motor controller in a low voltage state, the device comprising:

[0029] The open-tube state control module is used to control the power electronic switch device of the motor controller to turn on when the power battery of the vehicle is in a low-voltage state, so that the motor controller is in an open-tube state;

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

[0031] The engine operation control module is used to control the engine operation according to the target motor speed output by the motor derating.

[0032] In a third aspect, an embodiment of the present application provides a computer storage medium, which stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the above-mentioned method steps.

[0033] In a fourth aspect, an embodiment of the present application provides a device, which may include: a processor and a memory; wherein the memory stores a computer program, and the computer program is suitable for being loaded by the processor and executing the above-mentioned method steps.

[0034] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0035] In an embodiment of the present application, when the power battery of the vehicle is in a low-voltage state, the power electronic switching device of the motor controller is controlled to be turned on so that the motor controller is in an open-tube state, and the motor output is controlled to be reduced. This can prevent the motor from losing control and generating back electromotive force, thereby protecting the DCDC converter from damage and ensuring reliable operation of the vehicle under low-voltage conditions.

[0036] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0038] Figure 1 It is a flow chart of a protection control method of a motor controller under a low voltage state provided by an embodiment of the present application;

[0039] Figure 2 It is a flow chart of a protection control process of a motor controller under a low voltage state provided by the present application;

[0040] Figure 3 It is a structural schematic diagram of a protection control device for a motor controller under a low voltage state provided by an embodiment of the present application;

[0041] Figure 4 It is a structural schematic diagram of a device provided in an embodiment of the present application. DETAILED DESCRIPTION

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

[0043] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0044] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0045] In the description of the present application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previously associated objects are in an "or" relationship.

[0046] The present application provides a protection control method, device, medium and equipment for a motor controller under a low voltage state to solve the problems existing in the above-mentioned related technical problems. In an embodiment of the present application, when the power battery of the vehicle is in a low voltage state, the power electronic switch device of the motor controller is controlled to be turned on so that the motor controller is in an open-tube state, and the motor output is controlled to be reduced, which can prevent the motor from losing control and generating back electromotive force, thereby protecting the DCDC converter from damage and ensuring the reliable operation of the vehicle under low voltage conditions. The following exemplary embodiments are used for detailed description.

[0047] The following will be combined with the attached Figure 1 -Attached Figure 2 , a protection control method for a motor controller under a low voltage state provided by an embodiment of the present application is introduced in detail. The method can be implemented by a computer program and can be run on a protection control device for a motor controller under a low voltage state based on a von Neumann system. The computer program can be integrated into an application or run as an independent tool application.

[0048] See also Figure 1 , is a flowchart of a protection control method for a motor controller in a low voltage state provided by an embodiment of the present application, and is applied to a motor controller. Figure 1 As shown, the method of the embodiment of the present application may include the following steps:

[0049] S101, when the power battery of the vehicle is in a low voltage state, controlling the power electronic switch device of the motor controller to turn on, so that the motor controller is in an open-tube state;

[0050] Among them, the power battery refers to the battery pack that provides power to electric vehicles, usually composed of multiple battery cells to provide the required voltage and capacity. The low-voltage state refers to the voltage of the power battery dropping to a lower level. The motor controller (MCU) is a device used to control the operation of the motor, including its speed, torque and direction. It controls the motor by adjusting the switching state of the power electronic switching device. The open-tube state refers to the power electronic switching device being in the on state, allowing current to pass.

[0051] In some embodiments of the present application, the voltage of the power battery of an electric vehicle gradually decreases due to long-term use during driving. 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 a power electronic switching device (such as an IGBT) through its internal control logic to turn it on. This causes the motor controller to be in an open-tube state, allowing current to continue to flow to the motor, keeping the motor running even when the battery voltage is low.

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

[0053] In some embodiments of the present application, the following process is specifically performed before the power electronic switching device that controls the motor controller is turned on: obtaining the bus voltage and motor speed at the current moment; when the bus voltage at the current moment is less than a preset second voltage threshold, determining 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.

[0054] Among them, bus voltage refers to the voltage level on the bus in the power system. The bus is the main conductor used to distribute electrical energy in the power system. In electric vehicles, bus voltage refers to the voltage provided 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 refers to the voltage value pre-set by the system, which is used to determine whether the battery voltage is in a normal, 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 car monitors the bus voltage and motor speed in real time. The MCU first obtains the bus voltage and motor speed at the current moment. For example, the current bus voltage is 350 volts and the motor speed is 2000RPM. The MCU compares the obtained bus voltage with the preset voltage threshold. Assume that 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 switch device that controls the motor controller is turned on to put the motor controller in an open-tube state.

[0056] S102, when the motor controller is in an open-tube state and the bus voltage at the current moment is less than a preset first voltage threshold, controlling the output power of the motor in the vehicle to be reduced by a preset value so that the motor has a reduced output;

[0057] In some embodiments of the present application, when the motor controller is in an open-tube state and the bus voltage at a current moment is less than a preset first voltage threshold, the output power of the motor in the vehicle is controlled to be reduced by a preset value to reduce the output of the motor; or when the motor controller is in an open-tube state and the bus voltage at a current moment 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 is continued to put the motor controller in an open-tube state.

[0058] For example, if the MCU is in an open-tube state, that is, the power electronic switch device is turned on, allowing current to flow to the motor. At this time, if the bus voltage 295 at the current moment is lower than the preset first voltage threshold of 300 volts, in order to protect the battery and the motor, the MCU will control the output power of the motor to be reduced by a preset value, for example, from 100 kilowatts to 70 kilowatts, to achieve a derated output. Or at this time, if the bus voltage 295 at the current moment is greater than or equal to the preset first voltage threshold of 300 volts, that is, between the preset first voltage threshold of 300 volts and the preset second voltage threshold (360 volts), the MCU will continue to execute the steps of controlling the power electronic switch device to turn on, keep the motor controller in the open-tube state, and allow the motor to run at normal power.

[0059] S103, controlling the engine operation according to the target motor speed output by the motor at a reduced rating.

[0060] In some embodiments of the present application, the specific process of controlling the operation of the engine according to the target motor speed output by the motor at a reduced rating includes: receiving an open-tube signal sent by an external controller; when the target motor speed is less than a preset first speed threshold, responding to the open-tube signal, controlling the motor to maintain the running state and starting the timer; and issuing a fault alarm message when the open-tube signal sent by the external controller is continuously received within the timing time period.

[0061] In some embodiments, when 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 reduce the preset value is continued.

[0062] In some embodiments, in response to a shutdown request sent by an external controller, a power electronic switch device of a motor controller is controlled to be turned off to stop the engine.

[0063] In some embodiments, when 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; when the vehicle's power battery is in a normal state, an open-tube signal sent by an external controller is received; when there is no fault in the vehicle's power supply system, the open-tube signal is responded to; or when there is a fault in the vehicle's power supply system, the open-tube 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 an open-tube signal sent by the external controller. If the target motor speed is lower than a preset first speed threshold (eg, 1000 RPM), the MCU responds to the open-tube signal, keeps the motor running, and starts a timer.

[0065] If the MCU continues to receive the open-tube signal during the timer operation, but the motor speed cannot reach the target value, the MCU will issue a fault alarm message.

[0066] If the target motor speed reaches or exceeds a 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 device to turn off and stop the motor from running.

[0068] If the current bus voltage is higher than the preset third voltage threshold (e.g. 420 volts), or the motor speed is lower than the preset second speed threshold (e.g. 500 RPM), the MCU determines that the power battery is in a normal state. When the power battery is in a normal state, the MCU receives and responds to the open-tube signal from the external controller. If there is no fault in the power supply system, the MCU will respond to the open-tube signal; if there is a fault, the MCU will not respond.

[0069] For example Figure 2 As shown, when the bus voltage at the current moment is greater than the preset third voltage threshold or the motor speed is less than the preset second speed threshold, it is determined that the power battery of the vehicle is in a normal state; when the bus voltage at the current moment is less than the preset second voltage threshold, it is determined that the power battery of the vehicle is in a low voltage state. The preset third voltage threshold is greater than the preset second voltage threshold. When the power battery of the vehicle is in a normal state, receive the open-tube signal sent by the external controller; when there is no fault in the power supply system of the vehicle, respond to the open-tube signal; or when there is a fault in the power supply system of the vehicle, do not respond to the open-tube signal. When the power battery of the vehicle is in a low voltage state, control the power electronic switch device of the motor controller to turn on so that the motor controller is in an open-tube state; when the motor controller is in an open-tube state and the bus voltage at the current moment is less than the preset first voltage threshold, control the output power of the motor in the vehicle to reduce the preset value so that the motor output is reduced; the preset second voltage threshold is greater than the preset first voltage threshold. When the motor controller is in an open-tube state and the bus voltage at the current moment is greater than or equal to the preset first voltage threshold, continue to perform the step of controlling the power electronic switch device of the motor controller to turn on so that the motor controller is in an open-tube state. Receive an open-tube signal sent by an external controller; when the target motor speed is less than a preset first speed threshold, respond to the open-tube signal, control the motor to keep running and start the timer; when the open-tube signal sent by the external controller is continuously received within the timing time period, issue a fault alarm message.

[0070] In an embodiment of the present application, when the power battery of the vehicle is in a low-voltage state, the power electronic switching device of the motor controller is controlled to be turned on so that the motor controller is in an open-tube state, and the motor output is controlled to be reduced. This can prevent the motor from losing control and generating back electromotive force, thereby protecting the DCDC converter from damage and ensuring reliable operation of the vehicle under low-voltage conditions.

[0071] The following is an embodiment of the device of the present application, which can be used to execute the embodiment of the method of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method of the present application.

[0072] See also Figure 3 , which shows a schematic diagram of the structure of a protection control device for a motor controller in a low voltage state provided by an exemplary embodiment of the present application. The protection control device for the motor controller in a low voltage state can be implemented as all or part of a device through software, hardware or a combination of both. The device 1 includes an open-tube state control module 10, a motor derating control module 20, and an engine operation control module 30.

[0073] The open-tube state control module 10 is used to control the power electronic switch device of the motor controller to turn on when the power battery of the vehicle is in a low-voltage state, so that the motor controller is in an open-tube 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 so as to reduce the output of the motor when the motor controller is in an open-tube state and the bus voltage at the current moment is less than a preset first voltage threshold;

[0075] The engine operation control module 30 is used to control the engine operation according to the target motor speed output by the motor at a derated output.

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

[0077] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0078] In an embodiment of the present application, when the power battery of the vehicle is in a low-voltage state, the power electronic switching device of the motor controller is controlled to be turned on so that the motor controller is in an open-tube state, and the motor output is controlled to be reduced. This can prevent the motor from losing control and generating back electromotive force, thereby protecting the DCDC converter from damage and ensuring reliable operation of the vehicle under low-voltage conditions.

[0079] The present 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 a low voltage state provided by each of the above method embodiments.

[0080] The present application also provides a computer program product including instructions, which, when executed on a computer, enables the computer to execute the protection control method for a motor controller in a low voltage state of each of the above-mentioned method embodiments.

[0081] See also Figure 4 , which is a schematic diagram of the structure of a device provided in the embodiment of the present application. Figure 4 As shown, the device 1000 may include: at least one processor 1001 , at least one network interface 1004 , a user interface 1003 , a 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 (Display) and a camera (Camera), and the optional 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] Among them, the processor 1001 may include one or more processing cores. The processor 1001 uses various interfaces and lines to connect the various parts of the entire device 1000, and executes various functions and processes data of the device 1000 by running or executing instructions, programs, code sets or instruction sets stored in the memory 1005, and calling data stored in the memory 1005. Optionally, the processor 1001 can be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA). The processor 1001 can integrate one or a combination of a central processing unit (Central Processing Unit, CPU), a graphics processing unit (Graphics Processing Unit, GPU) and a modem. Among them, the CPU mainly processes the operating system, user interface and application programs; the GPU is responsible for rendering and drawing the content to be displayed on the display screen; the modem is used to process wireless communications. It can be understood that the above-mentioned modem may not be integrated into the processor 1001, and it can be implemented separately through a chip.

[0086] Among them, the memory 1005 may include a random access memory (Random Access Memory, RAM) and may also include a read-only memory (Read-Only Memory). Optionally, the memory 1005 includes a non-transitory computer-readable storage medium. The memory 1005 can be used to store instructions, programs, codes, 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 a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the above-mentioned various method embodiments, etc.; the data storage area may store data involved in the above-mentioned various method embodiments, etc. The memory 1005 may also be optionally at least one storage system located away from the aforementioned processor 1001. As Figure 4 As shown, the memory 1005 as a computer storage medium may include an operating system, a network communication module, a user interface module, and a protection control application program for the motor controller in a low voltage state.

[0087] exist Figure 4In the device 1000 shown, the user interface 1003 is mainly used to provide an input interface for the user and obtain the data input by the user; and 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 power battery of the vehicle is in a low voltage state, the power electronic switch device of the motor controller is controlled to be turned on, so that the motor controller is in an open-tube state;

[0089] When the motor controller is in an open-tube state and the bus voltage at the current moment is less than a preset first voltage threshold, controlling the output power of the motor in the vehicle to be reduced by a preset value so as to reduce the output of the motor;

[0090] The engine operation is controlled according to the target motor speed of the motor derating output.

[0091] In one embodiment, before executing the control of turning on the power electronic switch device of the motor controller, the processor 1001 specifically performs the following operations:

[0092] Get the bus voltage and motor speed at the current moment;

[0093] When the bus voltage at the current moment is less than a preset second voltage threshold, it is determined that the power battery of the vehicle 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 further performs the following operations:

[0095] When the motor controller is in the open state and the bus voltage at the current moment is greater than or equal to the preset first voltage threshold, continue to execute the step of controlling the power electronic switch device of the motor controller to turn on, so that the motor controller is in the open state.

[0096] In one embodiment, the processor 1001 performs the following operations when executing the target motor speed output according to the motor derated and controlling the engine operation:

[0097] Receive a tube opening signal sent by an external controller;

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

[0099] When the open-tube signal sent by the external controller is continuously received within the timing period, a fault alarm message is issued.

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

[0101] When 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 reduce a preset value is continued.

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

[0103] In response to a shutdown request sent by an external controller, a power electronic switch device of a motor controller is controlled to be turned off to stop the engine.

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

[0105] When 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, determining that the power battery of the vehicle is in a normal state;

[0106] When the power battery of the vehicle is in a normal state, receiving an open-tube signal sent by an external controller;

[0107] In the case that there is no fault in the power supply system of the vehicle, responding to the pipe opening signal; or in the case that there is a fault in the power supply system of the vehicle, not responding to the pipe opening signal;

[0108] 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 an embodiment of the present application, when the power battery of the vehicle is in a low-voltage state, the power electronic switching device of the motor controller is controlled to be turned on so that the motor controller is in an open-tube state, and the motor output is controlled to be reduced. This can prevent the motor from losing control and generating back electromotive force, thereby protecting the DCDC converter from damage and ensuring reliable operation of the vehicle under low-voltage conditions.

[0110] A person skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program for the protection control of the motor controller under the low voltage state can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium of the program for the protection control of the motor controller under the low voltage state can be a disk, an optical disk, a read-only storage memory or a random access storage memory, etc.

[0111] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A protection control method for a motor controller under low voltage state, characterized in that: Applied to a motor controller, the method comprises: When the power battery of the vehicle is in a low voltage state, controlling the power electronic switch device of the motor controller to turn on, so that the motor controller is in an open-tube state; When the motor controller is in an open-tube state and the bus voltage at the current moment is less than a preset first voltage threshold, controlling the output power of the motor in the vehicle to be reduced by a preset value so as to reduce the output of the motor; The engine operation is controlled according to the target motor speed output by the motor at a reduced rating.

2. The method according to claim 1, characterized in that Before the power electronic switch device controlling the motor controller is turned on, the method further includes: Get the bus voltage and motor speed at the current moment; When the bus voltage at the current moment is less than a preset second voltage threshold, it is determined that the power battery of the vehicle is in a low voltage state; the preset second voltage threshold is greater than the preset first voltage threshold.

3. The method according to claim 1, characterized in that The method further comprises: When the motor controller is in the open state and the bus voltage at the current moment is greater than or equal to the preset first voltage threshold, continue 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 the open state.

4. The method according to claim 1, characterized in that The controlling the engine operation according to the target motor speed output by the motor at a reduced rating includes: Receive a 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 keep running and a timer is started; When the open-tube signal sent by the external controller is continuously received within the timing period, a fault alarm message is issued.

5. The method according to claim 4, characterized in that The method further comprises: When 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 reduce a preset value is continued.

6. The method according to any one of claims 1 to 5, characterized in that: The method further comprises: In response to a shutdown request sent by an external controller, the power electronic switch device of the motor controller is controlled to be turned off to stop the engine.

7. The method according to claim 2, characterized in that The method further comprises: When 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, determining that the power battery of the vehicle is in a normal state; When the power battery of the vehicle is in a normal state, receiving an open-tube signal sent by an external controller; In the case where there is no fault in the power supply system of the vehicle, responding to the pipe opening signal; or in the case where there is a fault in the power supply system of the vehicle, not responding to the pipe opening signal; 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.

8. A protection control device for a motor controller in a low voltage state, characterized in that: The device comprises: An open-tube state control module, used for controlling the power electronic switch device of the motor controller to turn on when the power battery of the vehicle is in a low-voltage state, so that the motor controller is in an open-tube state; A motor derating control module, used to control the output power of the motor in the vehicle to be reduced by a preset value so as to reduce the output of the motor when the motor controller is in an open-tube state and the bus voltage at the current moment is less than a preset first voltage threshold; The engine operation control module is used to control the engine operation according to the target motor speed output by the motor at a reduced rating.

9. A computer storage medium, characterized in that: The computer storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the method according to any one of claims 1 to 7.

10. A device, characterized in that: include: A processor and a memory; wherein the memory stores a computer program, and the computer program is suitable for being loaded by the processor and executing the method according to any one of claims 1 to 7.

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