Logging protection method, system and equipment for electric drive system under climbing working condition and medium

Abstract

The invention relates to a locked-rotor protection method, system, equipment and medium for an electric drive system under a climbing working condition, and belongs to the technical field of electric hybrid automobiles, the locked-rotor protection method for the electric drive system under the climbing working condition comprises the following steps: when a preset locked-rotor protection triggering condition is met, setting a carrier frequency as a preset first carrier frequency, the data of the driving motor and the data of the motor controller are acquired in real time; and dynamically adjusting the carrier frequency of the motor controller based on the data of the motor controller, exiting the locked-rotor protection when the data of the driving motor exceeds a threshold value, and setting the carrier frequency as a preset third carrier frequency at the same time. According to the invention, the motor controller can be effectively protected from being damaged due to overheating caused by temperature rise in the climbing locked-rotor working condition, meanwhile, certain torque output is ensured, and the driving experience and safety of the off-road vehicle are improved.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of hybrid electric vehicles, and particularly relates to a method, system, device, and medium for protecting an electric drive system against blocking during a climbing condition. Background Art

[0002] The electric drive system mainly consists of a motor controller, a drive motor, and a reduction mechanism. The motor controller is a power electronic device controlled by motor control algorithm software. The main circuit consists of an IGBT to form a three-phase bridge circuit, which inversely outputs three-phase alternating current to the stator winding of the drive motor to generate a rotating magnetic field and drive the motor to rotate. In recent years, with the continuous progress of electric drive system technology, the comprehensive performance of hybrid electric vehicles with the electric drive system as the main driving force in the market has been significantly improved, solving the problem of user usage costs under high oil prices. The hybrid technology has gradually extended to the off-road vehicle field mainly based on traditional power and four-wheel drive systems, reducing the long-term high energy consumption of off-road vehicles.

[0003] Due to the characteristics of the electric drive system itself, overheating is likely to occur after a long time of low-speed and high torque, causing the hybrid electric off-road vehicle to suddenly lose power and slide during the extreme climbing condition on a large slope, resulting in safety accidents. During the climbing condition, if the resistance is large, the vehicle speed is close to zero, and the accelerator is deeply depressed to output the peak torque, the current is the largest. Since the rotational speed is close to zero, the current is no longer periodic alternating current but direct current. At different angles, the maximum current acts on different phases, causing serious heating of a certain phase IGBT. If not protected, the IGBT will be damaged due to overheating.

[0004] Therefore, it is necessary to provide a new method, system, device, and medium for protecting an electric drive system against blocking during a climbing condition to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present disclosure is to maintain a certain torque output when the temperature of the motor controller rises during low-speed and high-torque output or blocking conditions, so that the vehicle can avoid sliding and can be controlled to go downhill, improving the reliability and safety of off-road climbing.

[0006] The present disclosure achieves the above purpose through the following technical solutions:

[0007] A method for protecting an electric drive system against blocking during a climbing condition, which is applied to the motor controller of a hybrid off-road vehicle. The output U / V / W phase lines and signal lines of the motor controller are correspondingly connected to the input U / V / W phase lines and signal lines of the drive motor. It is characterized by including the following steps:

[0008] When a preset blocking protection trigger condition is reached, set the carrier frequency to a preset first carrier frequency, and continuously obtain the drive motor data and the motor controller data in real time;

[0009] Dynamically adjust the carrier frequency of the motor controller based on the motor controller data. When the drive motor data exceeds the threshold, exit the stall protection, and at the same time set the carrier frequency to a preset third carrier frequency.

[0010] As a further optimization scheme of the present disclosure, the stall protection trigger conditions include:

[0011] The rotational speed n of the drive motor continuously remains less than a preset first rotational speed n1 and the torque Tq is greater than a preset first torque Tq1.

[0012] As a further optimization scheme of the present disclosure, dynamically adjusting the carrier frequency of the motor controller based on the motor controller data includes:

[0013] The motor controller data includes the temperature T;

[0014] When the temperature of the motor controller continuously remains less than a preset first temperature T1, maintain the carrier frequency of the motor controller as the first carrier frequency f1;

[0015] When the temperature of the motor controller continuously rises until it is greater than the first temperature T1, adjust the carrier frequency of the motor controller to a preset second carrier frequency f2;

[0016] When the temperature of the motor controller decreases until it is less than a preset second temperature T2, adjust the carrier frequency of the motor controller to the first carrier frequency f1;

[0017] When the temperature of the motor controller continues to rise until it is greater than a preset third temperature T3, maintain the carrier frequency of the motor controller as the second carrier frequency f2, and at the same time linearly reduce the torque of the drive motor until the temperature of the motor controller reaches equilibrium, and output a preset torque value.

[0018] As a further optimization scheme of the present disclosure, when the drive motor data exceeds the threshold, exit the stall protection, and at the same time set the carrier frequency to a preset third carrier frequency, including:

[0019] The drive motor data includes the rotational speed n and the torque Tq;

[0020] When the rotational speed n of the drive motor is greater than a preset rotational speed threshold n2 or the torque is less than a preset torque threshold Tq2, exit the stall protection, and at the same time set the carrier frequency to a preset third carrier frequency f3.

[0021] A stall protection system for an electric drive system in a climbing working condition, comprising:

[0022] A data collection module, configured to set the carrier frequency to a preset first carrier frequency when a preset locked-rotor protection trigger condition is met, and to acquire the drive motor data and the motor controller data in real time;

[0023] A locked-rotor protection module, configured to dynamically adjust the carrier frequency of the motor controller based on the motor controller data. When the drive motor data exceeds a threshold, the locked-rotor protection is exited, and at the same time, the carrier frequency is set to a preset third carrier frequency.

[0024] As a further optimization scheme of the present disclosure, the locked-rotor protection trigger condition includes:

[0025] The rotational speed n of the drive motor continuously remains less than a preset first rotational speed n1 and the torque Tq is greater than a preset first torque Tq1.

[0026] As a further optimization scheme of the present disclosure, the locked-rotor protection module dynamically adjusts the carrier frequency of the motor controller based on the motor controller data, including:

[0027] The motor controller data includes the temperature T;

[0028] When the temperature of the motor controller continuously remains less than a preset first temperature T1, the carrier frequency of the motor controller is maintained at the first carrier frequency f1;

[0029] When the temperature of the motor controller continuously rises until it is greater than the first temperature T1, the carrier frequency of the motor controller is adjusted to a preset second carrier frequency f2;

[0030] When the temperature of the motor controller decreases until it is less than a preset second temperature T2, the carrier frequency of the motor controller is adjusted to the first carrier frequency f1;

[0031] When the temperature of the motor controller continues to rise until it is greater than a preset third temperature T3, the carrier frequency of the motor controller is maintained at the second carrier frequency f2, and at the same time, the torque of the drive motor is linearly reduced until the temperature balance of the motor controller is reached, and a preset torque value is output.

[0032] As a further optimization scheme of the present disclosure, when the drive motor data exceeds a threshold, the locked-rotor protection is exited, and at the same time, the carrier frequency is set to a preset third carrier frequency, including:

[0033] The drive motor data includes the rotational speed n and the torque Tq;

[0034] When the rotational speed n of the drive motor is greater than a preset rotational speed threshold n2 or the torque is less than a preset torque threshold Tq2, the locked-rotor protection is exited, and at the same time, the carrier frequency is set to a preset third carrier frequency f3.

[0035] An electronic device includes a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete communication with each other through the communication bus;

[0036] The memory is used to store computer programs;

[0037] The processor is used to execute the programs stored in the memory to implement the stall protection method for the electric drive system under climbing conditions.

[0038] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the stall protection method for the electric drive system under climbing conditions is implemented.

[0039] The beneficial effects of the present disclosure are as follows:

[0040] The present disclosure can effectively protect the motor controller from being damaged due to overheating caused by temperature rise under the climbing stall condition, and at the same time ensure a certain torque output, improving the driving experience and safety of off-road vehicles. Description of the Drawings

[0041] Figure 1 is the flowchart of the method in the embodiment of the present disclosure;

[0042] Figure 2 is the carrier frequency hysteresis curve diagram in the embodiment of the present disclosure;

[0043] Figure 3 is the schematic diagram of the specific steps of the method in the embodiment of the present disclosure;

[0044] Figure 4 is the system structure block diagram in the embodiment of the present disclosure;

[0045] Figure 5 is the device structure block diagram in the embodiment of the present disclosure. Detailed Embodiments

[0046] The following further describes the present application in detail with reference to the drawings. It is necessary to point out here that the following detailed embodiments are only used to further illustrate the present application and should not be construed as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0047] As Figure 1 shown, a stall protection method for an electric drive system under climbing conditions is applied to the motor controller MCU of a hybrid off-road vehicle. The output U / V / W phase lines and signal lines of the motor controller MCU are correspondingly connected to the input U / V / W phase lines and signal lines of the drive motor, and the method includes the following steps:

[0048] When the preset locked-rotor protection trigger condition is reached, set the carrier frequency to the preset first carrier frequency, and obtain the drive motor data and the motor controller data in real time;

[0049] Dynamically adjust the carrier frequency of the motor controller based on the motor controller data. When the drive motor data exceeds the threshold, exit the locked-rotor protection, and at the same time set the carrier frequency to the preset third carrier frequency.

[0050] The specific steps are as Figure 3 shown;

[0051] The locked-rotor protection trigger conditions include:

[0052] The rotational speed n of the drive motor continuously remains less than the preset first rotational speed n1 and the torque Tq is greater than the preset first torque Tq1.

[0053] Dynamically adjusting the carrier frequency of the motor controller based on the motor controller data includes:

[0054] The motor controller data includes the temperature T;

[0055] When the temperature of the motor controller continuously remains less than the preset first temperature T1, keep the carrier frequency of the motor controller as the first carrier frequency f1;

[0056] When the temperature of the motor controller continuously rises until it is greater than the first temperature T1, adjust the carrier frequency of the motor controller to the preset second carrier frequency f2;

[0057] When the temperature of the motor controller decreases until it is less than the preset second temperature T2, adjust the carrier frequency of the motor controller to the first carrier frequency f1;

[0058] When the temperature of the motor controller continues to rise until it is greater than the preset third temperature T3, maintain the carrier frequency of the motor controller as the second carrier frequency f2, and at the same time linearly reduce the torque of the drive motor until the temperature of the motor controller reaches equilibrium, and output the preset torque value.

[0059] When the drive motor data exceeds the threshold, exit the locked-rotor protection, and at the same time set the carrier frequency to the preset third carrier frequency, including:

[0060] The drive motor data includes the rotational speed n and the torque Tq;

[0061] When the rotational speed n of the drive motor is greater than the preset rotational speed threshold n2 or the torque is less than the preset torque threshold Tq2, exit the locked-rotor protection, and at the same time set the carrier frequency to the preset third carrier frequency f3.

[0062] The carrier frequency hysteresis curve is as Figure 2 shown.

[0063] In this embodiment, the stall protection method for the electric drive system under climbing conditions specifically includes:

[0064] If the motor speed continuously remains less than 50 rpm and the torque is greater than 165 Nm, then the stall protection strategy is triggered, and the carrier frequency is set to 8 kHz;

[0065] If the temperature of the motor controller continuously remains less than 95 °C, then the carrier frequency of the motor controller is maintained at 8 kHz;

[0066] If the temperature of the motor controller continuously rises and is greater than 100 °C, then the carrier frequency of the motor controller is adjusted to 5 kHz;

[0067] If the temperature of the motor controller decreases and is less than 95 °C, then the carrier frequency of the motor controller is adjusted to 8 kHz;

[0068] If the temperature of the motor controller continues to rise and is greater than 145 °C, the frequency is maintained at 5 kHz, and at the same time, the torque linearly decreases until the temperature balance of the motor controller is reached, and a certain torque value is output.

[0069] When the motor speed is greater than the set threshold of 100 rpm or the torque is less than 120 Nm, then the stall protection strategy is exited, and at the same time, the carrier frequency is set to 10 kHz.

[0070] As Figure 3 shown, the embodiment of the present disclosure provides a stall protection system for an electric drive system under climbing conditions, including:

[0071] A data collection module 11, configured to set the carrier frequency to a preset first carrier frequency when a preset stall protection trigger condition is reached, and to acquire the drive motor data and the motor controller data in real time;

[0072] A stall protection module 12, configured to dynamically adjust the carrier frequency of the motor controller based on the motor controller data, and to exit the stall protection when the drive motor data exceeds the threshold, and at the same time set the carrier frequency to a preset third carrier frequency.

[0073] For the implementation processes of the functions and roles of each module in the above system, please refer to the implementation processes of the corresponding steps in the above method for details, and will not be elaborated here.

[0074] For the system embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to the partial descriptions of the method embodiments. The system embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present disclosure solution. A person of ordinary skill in the art can understand and implement it without creative work.

[0075] In the above embodiments, any number of all the modules can be combined and implemented in one module, or any one of the modules can be split into multiple modules. Or, at least part of the functions of one or more of these modules can be combined with at least part of the functions of other modules and implemented in one module. At least one of all the modules can be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), a system on chip, a system on a substrate, a system on a package, an application specific integrated circuit (ASIC), or can be implemented by any other reasonable way of integrating or packaging circuits, etc., by hardware or firmware, or implemented in any one of the three implementation ways of software, hardware, and firmware, or in any appropriate combination of several of them. Or, at least one of all the modules can be at least partially implemented as a computer program module, and when the computer program module runs, it can execute the corresponding functions.

[0076] See Figure 3 , the electronic device provided by the embodiments of the present disclosure includes a processor 1110, a communication interface 1120, a memory 1130, and a communication bus 1140. Among them, the processor 1110, the communication interface 1120, and the memory 1130 complete communication with each other through the communication bus 1140;

[0077] The memory 1130 is used to store computer programs;

[0078] The processor 1110, when executing the program stored on the memory 1130, implements the following electric drive system stall protection method under climbing conditions.

[0079] The above communication bus 1140 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus 1140 may be divided into an address bus, a data bus, a control bus, etc. For the sake of convenience of representation, only a thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0080] The communication interface 1120 is used for communication between the above electronic device and other devices.

[0081] The memory 1130 may include a Random Access Memory (RAM), and may also include a non-volatile memory, such as at least one disk memory. Optionally, the memory 1130 may also be at least one storage device located far from the aforementioned processor 1110.

[0082] The above processor 1110 may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0083] Embodiments of the present disclosure also provide a computer-readable storage medium. A computer program is stored on the above computer-readable storage medium, and when the computer program is executed by a processor, the above-described method for protecting an electric drive system from stalling during a climbing condition is implemented.

[0084] The computer-readable storage medium may be included in the device / device described in the above embodiments; it may also exist alone without being assembled into the device / device. The above computer-readable storage medium carries one or more programs, and when the one or more programs are executed, the method for protecting an electric drive system from stalling during a climbing condition according to the embodiments of the present disclosure is implemented.

[0085] According to an embodiment of the present disclosure, the computer-readable storage medium may be a non-volatile computer-readable storage medium, for example, it may include but is not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In the present disclosure, the computer-readable storage medium may be any tangible medium that contains or stores a program, and the program may be used by or in combination with an instruction execution system, apparatus, or device.

[0086] The above-described embodiments merely represent several implementation manners of the present disclosure, and their descriptions are relatively specific and detailed, but should not be construed as a limitation on the patent scope of the present disclosure. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several modifications and improvements can still be made, and these all belong to the protection scope of the present disclosure.

Claims

1. A method for protecting a stalled rotor of an electric drive system in a hill climbing condition, applied to a motor controller of a hybrid off-road vehicle, wherein the output U / V / W phase lines and signal lines of the motor controller are correspondingly connected to the input U / V / W phase lines and signal lines of the drive motor, and characterized in that: The following steps are involved: When a preset stall protection trigger condition is reached, the carrier frequency is set to a preset first carrier frequency, and the drive motor data and the motor controller data are acquired in real time; The carrier frequency of the motor controller is dynamically adjusted based on the motor controller data. When the drive motor data exceeds a threshold, the stall protection is exited and the carrier frequency is set to a preset third carrier frequency.

2. The method for protecting an electric drive system from stalling in a hill climbing condition according to claim 1, characterized in that: The stall protection triggering conditions include: The rotation speed n of the driving motor is continuously lower than a preset first rotation speed n1 and the torque Tq is higher than a preset first torque Tq1.

3. The method for protecting an electric drive system from stalling in a hill climbing condition according to claim 1, characterized in that: Dynamically adjusting the carrier frequency of the motor controller based on the motor controller data, comprising: The motor controller data includes temperature T; When the temperature of the motor controller is continuously lower than a preset first temperature T1, maintaining the carrier frequency of the motor controller at the first carrier frequency f1; When the temperature of the motor controller continues to rise until it is greater than the first temperature T1, adjusting the carrier frequency of the motor controller to a preset second carrier frequency f2; When the temperature of the motor controller decreases to be lower than a preset second temperature T2, adjusting the carrier frequency of the motor controller to the first carrier frequency f1; When the temperature of the motor controller continues to rise until it is greater than the preset third temperature T3, the carrier frequency of the motor controller is maintained at the second carrier frequency f2, and the torque of the drive motor is linearly reduced until the temperature of the motor controller is balanced, and a preset torque value is output.

4. The method for protecting an electric drive system from stalling in a hill climbing condition according to claim 1, characterized in that: When the drive motor data exceeds the threshold, the stall protection is exited, and the carrier frequency is set to a preset third carrier frequency, including: The driving motor data includes a rotation speed n and a torque Tq; When the speed n of the drive motor is greater than the preset speed threshold n2 or the torque is less than the preset torque threshold Tq2, the stall protection is exited and the carrier frequency is set to the preset third carrier frequency f3.

5. A stall protection system for an electric drive system in a hill climbing condition, characterized in that: include: A data collection module, used for setting the carrier frequency to a preset first carrier frequency and acquiring the drive motor data and the motor controller data in real time when a preset stall protection trigger condition is reached; The stall protection module is used to dynamically adjust the carrier frequency of the motor controller based on the motor controller data. When the drive motor data exceeds a threshold, the stall protection is exited and the carrier frequency is set to a preset third carrier frequency.

6. The stall protection system for electric drive system in hill climbing condition according to claim 5, characterized in that: The stall protection triggering conditions include: The rotation speed n of the driving motor is continuously lower than a preset first rotation speed n1 and the torque Tq is higher than a preset first torque Tq1.

7. The stall protection system for electric drive system in hill climbing condition according to claim 5, characterized in that: The stall protection module dynamically adjusts the carrier frequency of the motor controller based on the motor controller data, including: The motor controller data includes temperature T; When the temperature of the motor controller is continuously lower than a preset first temperature T1, maintaining the carrier frequency of the motor controller at the first carrier frequency f1; When the temperature of the motor controller continues to rise until it is greater than the first temperature T1, adjusting the carrier frequency of the motor controller to a preset second carrier frequency f2; When the temperature of the motor controller decreases to be lower than a preset second temperature T2, adjusting the carrier frequency of the motor controller to the first carrier frequency f1; When the temperature of the motor controller continues to rise until it is greater than the preset third temperature T3, the carrier frequency of the motor controller is maintained at the second carrier frequency f2, and the torque of the drive motor is linearly reduced until the temperature of the motor controller is balanced, and a preset torque value is output.

8. The stall protection system for electric drive system in hill climbing condition according to claim 5, characterized in that: When the drive motor data exceeds the threshold, the stall protection is exited, and the carrier frequency is set to a preset third carrier frequency, including: The driving motor data includes a rotation speed n and a torque Tq; When the speed n of the drive motor is greater than the preset speed threshold n2 or the torque is less than the preset torque threshold Tq2, the stall protection is exited and the carrier frequency is set to the preset third carrier frequency f3.

9. An electronic device, characterized in that: It includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; Memory, for storing computer programs; A processor is used to execute a program stored in a memory to implement the stall protection method for an electric drive system under a hill climbing condition as described in any one of claims 1 to 4.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the stall protection method for an electric drive system under hill climbing conditions described in any one of claims 1 to 4 is implemented.

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