A motor controller safety state switching method, device and readable storage medium

Abstract

The embodiment of the application provides a motor controller safety state switching method, equipment and a readable storage medium, relates to the motor control technical field, can improve the accuracy of safety state switching of the motor controller, reduces the risk of misjudgment, improves the safety of the motor controller, prolongs the service life of the motor controller, improves the driving experience and safety of the user. The motor controller safety state switching method comprises the following steps: obtaining the first current speed of a target motor and the corresponding first current voltage; obtaining the target voltage of the target motor corresponding to the first current speed; determining the target safety state of the target motor according to the size relationship between the first current voltage and the target voltage; and controlling the target motor to switch to the target safety state, wherein the target safety state comprises an active short-circuit protection state and an open-circuit protection state.

Description

Technical Field

[0001] This application relates to the field of motor control technology, and in particular to a method, device and readable storage medium for switching safe states of a motor controller. Background Technology

[0002] With the rapid development of new energy vehicles, they have gained widespread recognition and application. As the main power source for electric vehicles, when the electric drive system malfunctions and may affect driving safety, it is usually necessary to ensure that the electric drive system can enter a safe working state to ensure the safety of the people on board and the vehicle itself.

[0003] Currently, the safety states of motor controllers typically include active short-circuit protection and open-circuit protection. Traditional methods for switching the safety states of motor controllers usually rely on the motor's output torque and speed as the determining factors. However, these methods have limited reliance on specific criteria, leading to a high risk of misjudgment and frequent switching of the motor controller's safety state. This can damage components within the controller, ultimately impacting the user's driving experience and safety. Summary of the Invention

[0004] The embodiments of this application provide a method, device, and readable storage medium for switching the safety state of a motor controller, which can improve the accuracy of switching the safety state of the motor controller, reduce the risk of misjudgment, improve the safety of the motor controller, extend the service life of the motor controller, and improve the user's driving experience and safety.

[0005] A first aspect of this application provides a method for switching a motor controller's safe state, comprising:

[0006] Obtain the first current speed and the corresponding first current voltage of the target motor;

[0007] Obtain the target voltage of the target motor corresponding to the first current rotational speed;

[0008] The target safety status of the target motor is determined based on the relationship between the first current voltage and the target voltage.

[0009] Control the target motor to switch to the target safety state, which includes active short-circuit protection state and open-circuit protection state.

[0010] In some embodiments, prior to the step of obtaining the first current speed and the corresponding first current voltage of the target motor, the method further includes:

[0011] Obtain the table showing the correspondence between the back electromotive force and the rotational speed of the target motor;

[0012] The step of obtaining the target voltage of the target motor corresponding to the first current speed includes:

[0013] The target back electromotive force of the target motor corresponding to the first current speed is determined according to the correspondence table.

[0014] The step of determining the target safety status of the target motor based on the relationship between the first current voltage and the target voltage includes:

[0015] The target safety status of the target motor is determined based on the relationship between the first current voltage and the target back electromotive force.

[0016] In some implementations, determining the target safety status of the target motor based on the relationship between the first current voltage and the target voltage includes:

[0017] If the first current voltage is greater than the target voltage, the target safety state of the target motor is determined to be active short-circuit protection state;

[0018] If the first current voltage is less than the target voltage, the target safety state of the target motor is determined to be the open circuit protection state.

[0019] In some embodiments, the motor controller safety state switching method further includes:

[0020] The target safety status of the target motor is determined based on the relationship between the first current rotational speed and the rotational speed threshold.

[0021] In some implementations, determining the target safety status of the target motor based on the relationship between the first current voltage and the target voltage includes:

[0022] When the first current speed is less than the speed threshold and the first current voltage is greater than the target voltage, the second current speed and the corresponding second current voltage of the target motor are obtained, wherein the first current speed is obtained before the second current speed is obtained.

[0023] Determine the average value of the first current voltage and the second current voltage;

[0024] The target safety status of the target motor is determined based on the relationship between the average value and the target voltage.

[0025] In some embodiments, prior to the step of obtaining the first current speed and the corresponding first current voltage of the target motor, the method further includes:

[0026] Obtain the current safety status of the target motor.

[0027] In some embodiments, prior to the step of obtaining the first current speed and the corresponding first current voltage of the target motor, the method further includes:

[0028] Obtain the operating status information of the vehicle to which the target motor belongs, wherein the operating status information includes at least one of the road condition information of the vehicle's location and the vehicle's braking information;

[0029] Before the step of controlling the target motor to switch to the target safe state, the method further includes:

[0030] Based on the operational status information and the target security status, determine the switching time of the target security status;

[0031] The target motor is controlled based on the switching time and the target safety status.

[0032] A second aspect of this application provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the motor controller safety state switching method described in any of the first aspects above.

[0033] A third aspect of this application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the motor controller safety state switching method described in any of the first aspects above.

[0034] A fourth aspect of this application provides a computer program product, including a computer program, characterized in that, when the computer program is executed by a processor, it implements the steps of the motor controller safety state switching method described in any of the first aspects above.

[0035] This application provides a method, device, and readable storage medium for switching the safety state of a motor controller. By acquiring the first current speed and corresponding first current voltage of the target motor, and reading the target voltage of the target motor under normal operating conditions corresponding to the first current speed, the voltage of the target motor is used as a criterion for switching the safety state based on the relationship between the first current voltage and the target voltage. This determines whether the target motor needs to switch the safety state of the motor controller at the first current speed. This increases the criteria for judging the safety state switching of the motor controller, avoids limiting the switching conditions to a fixed range, improves the accuracy and objectivity of the safety state switching point of the motor controller, reduces the risk of misjudgment, protects the internal components of the motor controller, and solves the problem of frequent safety state switching caused by speed fluctuations. This improves the safety and stability of the motor controller operation, extends the service life of the motor controller, and improves the user's driving experience. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A schematic flowchart illustrating a method for switching a safe state of a motor controller, provided in an embodiment of this application;

[0038] Figure 2 A schematic structural diagram of a computer device provided in an embodiment of this application;

[0039] Figure 3 A schematic structural diagram of another computer device provided in an embodiment of this application. Detailed Implementation

[0040] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0042] When used herein, the singular forms of “a,” “an,” and “ / the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, in this specification, the term “and / or” includes any and all combinations of the associated listed items.

[0043] It should be noted that with the rapid development of new energy vehicles, they have gained widespread recognition and application. As the main power source for electric vehicles, when the electric drive system malfunctions and may affect driving safety, it is usually necessary to ensure that the electric drive system can enter a safe working state to ensure the safety of the people on board and the vehicle itself.

[0044] Currently, the safety states of motor controllers typically include active short-circuit protection and open-circuit protection. Traditional methods for switching the safety states of motor controllers usually rely on the motor's output torque and speed as the determining factors. However, these methods have limited reliance on specific criteria, leading to a high risk of misjudgment and frequent switching of the motor controller's safety state. This can damage components within the controller, ultimately impacting the user's driving experience and safety.

[0045] Therefore, inventing a method for switching the safe state of a motor controller that has diverse judgment conditions, objective judgment results, and low risk of misjudgment is an urgent problem to be solved.

[0046] like Figure 1 As shown, a first aspect of this application provides a method for switching the safety state of a motor controller, comprising:

[0047] Step S110: Obtain the first current speed and the corresponding first current voltage of the target motor.

[0048] Step S120: Obtain the target voltage of the target motor corresponding to the first current speed.

[0049] Step S130: Determine the target safety status of the target motor based on the relationship between the first current voltage and the target voltage.

[0050] Step S140: Control the target motor to switch to the target safety state, which includes active short circuit protection state and open circuit protection state.

[0051] It should be noted that active short-circuit protection refers to a motor controller control method that simultaneously turns on or off the field-effect transistors (FETs) in the upper or lower arm of the motor controller, forming a closed loop in the motor stator windings to dissipate back electromotive force energy and prevent damage to the system. Open-circuit protection refers to a motor controller control method that turns on all FETs in both the upper and lower arms, putting the inverter into passive rectification mode to protect the motor.

[0052] The motor controller safety state switching method provided in this application obtains the first current speed and corresponding first current voltage of the target motor, reads the target voltage of the target motor under normal operating conditions corresponding to the first current speed, and uses the voltage of the target motor as a criterion for safety state switching based on the relationship between the first current voltage and the target voltage to determine whether the target motor needs to switch the safety state of the motor controller at the first current speed. This increases the judgment conditions for the safety state switching of the motor controller, avoids limiting the switching conditions to a fixed range, improves the accuracy and objectivity of the safety state switching point of the motor controller, reduces the risk of misjudgment, protects the internal components of the motor controller, and also solves the problem of frequent safety state switching caused by speed fluctuations. This improves the safety and stability of the motor controller operation, extends the service life of the motor controller, and improves the user's driving experience.

[0053] In some feasible implementations, before obtaining the first current speed and the corresponding first current voltage of the target motor, the method further includes: obtaining a correspondence table between the back electromotive force and the speed of the target motor; obtaining the target voltage of the target motor corresponding to the first current speed, including: determining the target back electromotive force of the target motor corresponding to the first current speed according to the correspondence table; and determining the target safety state of the target motor according to the relationship between the first current voltage and the target voltage, including: determining the target safety state of the target motor according to the relationship between the first current voltage and the target back electromotive force.

[0054] It should be noted that there is a negative correlation between the target motor's speed and its back electromotive force (EMF). The corresponding table shows the relationship between the back EMF and speed obtained when the target motor is running normally on the test platform. This table can be obtained directly and is generally applicable when the target motor models are the same.

[0055] The motor controller safety state switching method provided in this application embodiment can improve the comparison speed of the first current voltage by pre-obtaining the correspondence table of the target motor, thereby improving the safety state switching speed of the motor controller, increasing the switching efficiency, and further improving the safety and reliability of electric vehicles.

[0056] In some feasible implementations, the target safety state of the target motor is determined based on the relationship between the first current voltage and the target voltage, including: when the first current voltage is greater than the target voltage, the target safety state of the target motor is determined to be an active short-circuit protection state; when the first current voltage is less than the target voltage, the target safety state of the target motor is determined to be an open-circuit protection state.

[0057] For example, the target safety state of the target motor can be determined based on the relationship between the difference between the first current voltage and the target voltage and a preset difference. If the difference is greater than the preset difference, the target safety state of the target motor is determined to be active short-circuit protection; if the difference is less than the preset difference, the target safety state of the target motor is determined to be open-circuit protection. This avoids frequent switching of the motor controller's safety state, improves the stability of the motor controller, protects the internal components of the motor controller, extends the service life of the motor controller, and improves the driving experience and stability during operation.

[0058] The motor controller safety state switching method provided in this application embodiment can determine that there is a risk of current backflow in the target motor when the first current voltage is greater than the target voltage. By switching to the active short circuit state, the back electromotive force of the target motor can be consumed, thereby improving the safety of the motor controller. When the first current voltage is less than the target voltage, the target motor is determined to be in a safe operating state. By switching to the open circuit state, the driver's operation can be ensured to be unaffected, thereby improving the driving experience during driving.

[0059] In some feasible implementations, the motor controller safety state switching method further includes: determining the target safety state of the target motor based on the relationship between the first current speed and the speed threshold.

[0060] For example, if the first current speed is greater than the speed threshold, the target safety state of the target motor is determined to be active short-circuit protection state; if the first current speed is less than or equal to the speed threshold, the target safety state of the target motor is determined to be open-circuit protection state.

[0061] The motor controller safety state switching method provided in this application increases the objectivity and accuracy of the switching point by adding rotational speed as a judgment condition, reduces the risk of misjudgment, protects the internal components of the motor controller, improves the safety of motor controller operation, extends the service life of the motor controller, and improves safety during driving.

[0062] In some feasible implementations, the target safety state of the target motor is determined based on the relationship between the first current voltage and the target voltage, including: when the first current speed is less than a speed threshold and the first current voltage is greater than the target voltage, obtaining the second current speed and the corresponding second current voltage of the target motor, wherein the acquisition time of the first current speed is earlier than the acquisition time of the second current speed; determining the average value of the first current voltage and the second current voltage; and determining the target safety state of the target motor based on the relationship between the average value and the target voltage.

[0063] For example, there may be multiple second current voltages. When there are multiple second current voltages, the time interval between the acquisition times of all adjacent second current voltages can be controlled to be equal.

[0064] The motor controller safety state switching method provided in this application, when the first current speed is less than the speed threshold and the first current voltage is greater than the target voltage, obtains the second current voltage of the target motor again. This can reduce the risk of misjudgment due to voltage fluctuations. Furthermore, by taking the average of the first and second current voltages and comparing it with the target voltage, the reliability and objectivity of the switching point determination can be further increased. This can improve the accuracy of motor controller safety state switching, further reduce the risk of misjudgment, protect the internal components of the motor controller, improve the safety of motor controller operation, extend the service life of the motor controller, and improve safety during driving.

[0065] In some feasible implementations, prior to the step of obtaining the first current speed and the corresponding first current voltage of the target motor, the method further includes: obtaining the current safety status of the target motor.

[0066] For example, if the current safety state and the target safety state are inconsistent, the third current speed and the corresponding third current voltage of the target motor can be acquired. Based on the relationship between the target voltage corresponding to the third current speed and the third current voltage, the target safety state corresponding to the third current speed is determined. Whether to switch the motor controller's safety state is then determined based on the current safety state, the target safety state corresponding to the first current speed, and the target safety state corresponding to the third target speed. If the vehicle to which the target motor belongs is in a newly started state, the switching of the target motor's safety state can be directly controlled based on the target safety state.

[0067] The motor controller safety state switching method provided in this application embodiment can obtain the current safety state of the target motor to determine whether it is necessary to switch the safety state of the motor controller according to the target safety state corresponding to the first current speed. This can facilitate extending the switching time and further avoid the problem of frequent switching of the motor controller safety state caused by voltage fluctuations or speed fluctuations. In this way, it can improve the safety and stability of the motor controller during operation, protect the internal components of the motor controller, extend the service life of the motor controller, and improve the user's driving experience and safety during driving.

[0068] In some feasible implementations, before the step of obtaining the first current speed and the corresponding first current voltage of the target motor, the method further includes: obtaining the operating status information of the vehicle to which the target motor belongs, wherein the operating status information includes at least one of the road condition information of the vehicle's location and the vehicle's braking information; before the step of controlling the target motor to switch to the target safety state, the method further includes: determining the switching time of the target safety state based on the operating status information and the target safety state; and controlling the target motor based on the switching time and the target safety state.

[0069] For example, warning information can be generated based on the operating status information when the target safety state of the target motor changes, wherein the warning information is used to prompt the driver to perform driving operations.

[0070] For example, operational status information can be obtained through in-vehicle image acquisition devices, vehicle networking functions, or devices such as in-vehicle radar.

[0071] For example, road condition information at the vehicle's location may include the slope of the vehicle's location, the distance to other vehicles around the vehicle, the speed of other vehicles around the vehicle, and traffic regulations around the vehicle. When the vehicle is on a steep slope, switching to active short-circuit protection may cause the vehicle to brake on the slope, creating a risk of rolling back. Therefore, it is necessary to switch to active short-circuit protection after the vehicle has passed the slope. Alternatively, when switching to active short-circuit protection on a slope, a warning message can be issued to remind the driver to turn on the hazard lights to alert oncoming vehicles, or to engage the handbrake to prevent the vehicle from rolling back. When the distance to other vehicles around the vehicle is close, or when the speed of other vehicles around the vehicle is high, switching to active short-circuit protection may cause the vehicle to brake suddenly, resulting in a rear-end collision and a safety accident. Therefore, it is necessary to switch to active short-circuit protection when the distance between the vehicle and surrounding vehicles is large, or when the speed of surrounding vehicles is low. In this case, a warning message can be issued to remind the driver to slow down, or to move the vehicle to an open area to facilitate safe braking. Traffic regulations information may include information such as no parking. If the vehicle is located in a no-parking zone, switching to active short-circuit protection will result in a violation. Therefore, it is necessary to switch to active short-circuit protection after the vehicle passes through the current no-parking section, or to issue a warning to prompt the driver to change the route so that the vehicle can brake at the nearest point.

[0072] The motor controller safety state switching method provided in this application determines the switching time of the target safety state by combining the operating status information of the vehicle to which the target motor belongs. This can avoid the target motor suddenly switching to a safety state, causing the vehicle to stop abruptly and triggering safety risks. As a result, it can further improve the stability of the motor controller operation, improve the driving experience during driving, and improve the stability, safety and reliability of the vehicle.

[0073] like Figure 2As shown in the illustration, this application provides a computer device, which can be a server. The computer device includes a processor, memory, input / output interfaces (I / O), and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores operating data of a power module. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communicating with external terminals via a network connection. When the computer program is executed by the processor, it implements a method for maintaining a safe state of a motor controller.

[0074] like Figure 3 As shown, the computer device can be a terminal, including a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, Near Field Communication (NFC), or other technologies. When the computer program is executed by the processor, it implements a method for safe state switching of a motor controller.

[0075] This application provides a computer program product, including a computer program, characterized in that, when the computer program is executed by a processor, it implements the steps of the motor controller safety state switching method as described above.

[0076] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0077] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0079] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for switching safe states of a motor controller, characterized in that, include: Obtain the first current speed and the corresponding first current voltage of the target motor; Obtain the target voltage of the target motor corresponding to the first current rotational speed; The target safety status of the target motor is determined based on the relationship between the first current voltage and the target voltage. Control the target motor to switch to the target safety state, which includes active short-circuit protection state and open-circuit protection state; The step of determining the target safety status of the target motor based on the relationship between the first current voltage and the target voltage includes: If the first current voltage is greater than the target voltage, the target safety state of the target motor is determined to be active short-circuit protection state; If the first current voltage is less than the target voltage, the target safety state of the target motor is determined to be the open circuit protection state.

2. The method for switching the safety state of a motor controller according to claim 1, characterized in that, Before the step of obtaining the first current speed and the corresponding first current voltage of the target motor, the method further includes: Obtain the table showing the correspondence between the back electromotive force and the rotational speed of the target motor; The step of obtaining the target voltage of the target motor corresponding to the first current speed includes: The target back electromotive force of the target motor corresponding to the first current speed is determined according to the correspondence table. The step of determining the target safety status of the target motor based on the relationship between the first current voltage and the target voltage includes: The target safety status of the target motor is determined based on the relationship between the first current voltage and the target back electromotive force.

3. The method for switching the safety state of a motor controller according to claim 1, characterized in that, Also includes: The target safety status of the target motor is determined based on the relationship between the first current rotational speed and the rotational speed threshold.

4. The method for switching the safety state of a motor controller according to claim 1 or 3, characterized in that, The step of determining the target safety status of the target motor based on the relationship between the first current voltage and the target voltage includes: When the first current speed is less than the speed threshold and the first current voltage is greater than the target voltage, the second current speed and the corresponding second current voltage of the target motor are obtained, wherein the acquisition time of the first current speed is earlier than the acquisition time of the second current speed; Determine the average value of the first current voltage and the second current voltage; The target safety status of the target motor is determined based on the relationship between the average value and the target voltage.

5. The method for switching the safety state of a motor controller according to claim 1, characterized in that, Before the step of obtaining the first current speed and the corresponding first current voltage of the target motor, the method further includes: Obtain the current safety status of the target motor.

6. The method for switching the safety state of a motor controller according to claim 1, characterized in that, Before the step of obtaining the first current speed and the corresponding first current voltage of the target motor, the method further includes: Obtain the operating status information of the vehicle to which the target motor belongs, wherein the operating status information includes at least one of the road condition information of the vehicle's location and the vehicle's braking information; Before the step of controlling the target motor to switch to the target safe state, the method further includes: Based on the operational status information and the target security status, determine the switching time of the target security status; The target motor is controlled based on the switching time and the target safety status.

7. The method for switching the safety state of a motor controller according to claim 2, characterized in that, There is a negative correlation between the target motor's rotational speed and its back electromotive force.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the motor controller safety state switching method according to any one of claims 1 to 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the motor controller safety state switching method according to any one of claims 1 to 7.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the motor controller safety state switching method according to any one of claims 1 to 7.

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