Static phase loss self-detection method and related equipment for electric vehicle electric drive

Abstract

The present invention discloses a static phase loss self-detection method for electric vehicle electric drives and related equipment. The method relates to the field of vehicle detection and primarily addresses the lack of a better self-detection method for static phase loss in electric vehicle electric drives. The method comprises: injecting a voltage vector into a two-phase stationary coordinate system when the target vehicle meets the phase loss self-detection prerequisites; adjusting the voltage amplitude based on a preset angle until the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value; and determining the phase loss state based on the three-phase current values ​​at the preset angle. The present invention is used in the static phase loss self-detection process for electric vehicle electric drives.

Description

Technical Field

[0001] The present invention relates to the field of vehicle detection, and in particular to a static phase loss self-detection method for an electric drive of an electric vehicle and related equipment. Background Art

[0002] The electrical architecture of electric vehicles (EVs) is complex, both in terms of usage scenarios and overall vehicle load. During the power-up process, some vehicle controllers may experience malfunctions due to changes in the external environment or internal initialization timing. Therefore, after the electric drive is powered on, a self-check of the high and low voltages is typically performed, and if any anomalies are detected, the vehicle enters a safe state to ensure overall vehicle safety. Currently, the most common self-check for phase loss in electric drives relies on current flow, typically using high-frequency signal injection. This detection process is accompanied by noise, and the current magnitude is related to the motor's stopping angle and motor parameters, making the determination relatively complex. Consequently, a better self-check method for static phase loss in electric vehicle electric drives is lacking. Summary of the Invention

[0003] In view of the above problems, the present invention provides a self-detection method for static phase loss of electric drive of trams and related equipment, the main purpose of which is to solve the problem of lack of a better self-detection method for static phase loss of electric drive of trams.

[0004] To solve at least one of the above technical problems, in a first aspect, the present invention provides a method for self-detecting static phase loss of an electric drive of an electric vehicle, the method comprising:

[0005] In the case where the target vehicle meets the phase loss self-test prerequisite, injecting a voltage vector into the two-phase stationary coordinate system;

[0006] Adjusting the voltage amplitude based on a preset angle until the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value;

[0007] The phase loss state is determined based on the three-phase current values ​​at the preset angle.

[0008] Optionally, the above method further includes:

[0009] Obtaining the gear status, brake status, high voltage status, controller status, and bus voltage of the target vehicle;

[0010] When the gear state is P gear, the brake state is pulled up, the high voltage state is activated, the controller state is ready and the bus voltage is greater than the control minimum operating voltage, it is determined that the target vehicle meets the phase loss self-test prerequisite.

[0011] Optionally, the above method further includes:

[0012] Obtaining the motor speed of the target vehicle;

[0013] When the motor speed is less than a preset speed, it is determined that the target vehicle meets the phase loss self-check prerequisite.

[0014] Optionally, adjusting the voltage amplitude based on the preset angle until the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value includes:

[0015] Controlling the voltage amplitude to increase gradually with a preset step size based on a preset angle until the absolute value of a non-zero phase current in the three-phase current is greater than or equal to a target current value;

[0016] The voltage amplitude is recorded when the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value.

[0017] Optionally, adjusting the voltage amplitude based on the preset angle until the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value includes:

[0018] When the preset angle is 30°, the current polarity of phase A is defined as greater than or equal to 20A, the current polarity of phase B is defined as 0, and the current polarity of phase C is defined as less than or equal to -20A.

[0019] When the preset angle is 150°, the current polarity of phase A is defined as less than or equal to -20A, the current polarity of phase B is defined as greater than or equal to 20A, and the current polarity of phase C is defined as 0;

[0020] When the preset angle is 270°, the polarity of the A-phase current is defined as 0, the polarity of the B-phase current is less than or equal to -20A, and the polarity of the C-phase current is greater than or equal to 20A.

[0021] Optionally, determining the phase loss state based on the three-phase current values ​​at the preset angle includes:

[0022] When the preset angle is 30° and the average current of phase A is less than 10A, it is determined that the upper bridge of phase A is missing.

[0023] When the preset angle is 30° and the average current of phase C is greater than -10A, it is determined that the lower bridge of phase C is missing.

[0024] When the preset angle is 150° and the average current of phase A is greater than -10A, it is determined that the lower bridge of phase A is missing.

[0025] When the preset angle is 150° and the average current of phase B is less than 10A, it is determined that the upper bridge of phase B is missing.

[0026] When the preset angle is 270° and the average current of phase B is greater than -10A, it is determined that the lower bridge of phase B is missing;

[0027] When the preset angle is 270° and the average current value of phase C is less than 10A, it is determined that the upper bridge of phase C is missing.

[0028] Optionally, the above method further includes:

[0029] When the number of phase failures is greater than zero and less than a preset number, resetting and restarting the power supply chip of the target vehicle's micro controller;

[0030] When the number of phase failures is greater than a preset number, the controller is controlled to enter a fault shutdown state.

[0031] In a second aspect, an embodiment of the present invention further provides a static phase loss self-detection device for an electric vehicle electric drive, comprising:

[0032] An injection unit is used to inject a voltage vector into a two-phase stationary coordinate system when the target vehicle meets the phase loss self-test prerequisite;

[0033] an adjusting unit, configured to adjust the voltage amplitude based on a preset angle until the absolute value of a non-zero phase current in the three-phase current is greater than or equal to a target current value;

[0034] The determining unit is configured to determine a phase loss state based on the three-phase current values ​​at the preset angle.

[0035] In order to achieve the above-mentioned purpose, according to the third aspect of the present invention, a computer-readable storage medium is provided, which includes a stored program, wherein when the above-mentioned program is executed by a processor, the steps of the above-mentioned electric vehicle electric drive static phase loss self-detection method are implemented.

[0036] In order to achieve the above-mentioned purpose, according to the fourth aspect of the present invention, there is provided an electronic device, comprising at least one processor and at least one memory connected to the processor; wherein the above-mentioned processor is used to call the program instructions in the above-mentioned memory to execute the steps of the above-mentioned electric vehicle electric drive static phase loss self-test method.

[0037] Through the above technical solution, the electric vehicle electric drive static phase loss self-detection method and related equipment provided by the present invention solve the problem of the lack of a better self-detection method for the electric vehicle electric drive static phase loss. The present invention injects a voltage vector into a two-phase stationary coordinate system when the target vehicle meets the prerequisite for phase loss self-detection; adjusts the voltage amplitude based on a preset angle until the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value; determines the phase loss state based on the three-phase current value at the preset angle, and judges the phase loss state of the electric drive by injecting three short-time currents, so as to achieve efficient and quiet identification of the motor phase loss state.

[0038] Correspondingly, the electric vehicle electric drive static phase loss self-detection device, equipment and computer-readable storage medium provided by the embodiments of the present invention also have the above-mentioned technical effects.

[0039] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0041] Figure 1 A schematic flow chart of a method for self-testing static phase loss of an electric drive of an electric vehicle provided by an embodiment of the present invention is shown;

[0042] Figure 2 A schematic diagram showing a complete flow chart of a static phase loss self-test method for an electric vehicle electric drive provided by an embodiment of the present invention;

[0043] Figure 3 A schematic block diagram showing the composition of a static phase loss self-detection device for electric drive of an electric vehicle provided by an embodiment of the present invention is shown;

[0044] Figure 4 The present invention provides a schematic block diagram of the composition of an electric vehicle electric drive static phase loss self-detection electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0046] In order to solve the problem of lack of a better self-detection method for static phase loss of electric drive of trams, an embodiment of the present invention provides a self-detection method for static phase loss of electric drive of trams, such as Figure 1 As shown, the method includes:

[0047] S101, injecting a voltage vector into a two-phase stationary coordinate system when the target vehicle meets the phase loss self-test prerequisite;

[0048] The above step S101 further includes S1011 and S1012:

[0049] S1011. Obtain the gear status, brake status, high-voltage status, controller status and bus voltage of the target vehicle; when the gear status is P gear, the brake status is pulled up, the high-voltage status is activated, the controller status is ready and the bus voltage is greater than the control minimum operating voltage, determine that the target vehicle meets the phase loss self-test prerequisite.

[0050] For example, the present application sets the self-test prerequisites, and detects whether the phase loss self-test prerequisites are met after the vehicle is powered on and the control is awakened. The prerequisites are set as: the vehicle gear is P gear, the EPB is in the pulled-up state, the high voltage is in the activated state, the bus voltage is greater than the control minimum operating voltage, the controller state is in Standby, and the phase loss self-test completion flag is 0.

[0051] PDCM_actualGear=P file&&EPBS_Sts_s=PARKED&&

[0052] HV_Network_active=active&&

[0053] MCU_Actual_Voltage>Work_Voltag_Min&&&&MCU_State=standby&&

[0054] SelfDetect_Flag=0

[0055] S1012. Obtain the motor speed of the target vehicle; if the motor speed is less than a preset speed, determine that the target vehicle meets the phase loss self-check prerequisite.

[0056] Furthermore, before entering the self-test phase, if the motor speed is greater than the set threshold (MCU_MotorSpd>200r), no self-test is performed, the completion flag is directly set to 1, and the self-test failure flag is 0; if the motor speed is less than the set threshold, the next self-test process is performed.

[0057] Based on the above settings, no self-test is performed when there is a rotational speed, and the self-test is directly determined to have passed, thereby avoiding the possibility of misjudgment caused by self-test in dynamic conditions, and is suitable for static self-test.

[0058] S102, adjusting the voltage amplitude based on a preset angle until the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value;

[0059] The above step S102 further includes S1021 and S1022:

[0060] S1021. Control the voltage amplitude to increase based on a preset angle and a preset step size until the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value; record the voltage amplitude when the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value.

[0061] S1022. When the preset angle is 30°, define the current polarity of phase A as greater than or equal to 20A, the current polarity of phase B as 0, and the current polarity of phase C as less than or equal to -20A; when the preset angle is 150°, define the current polarity of phase A as less than or equal to -20A, the current polarity of phase B as greater than or equal to 20A, and the current polarity of phase C as 0; when the preset angle is 270°, define the current polarity of phase A as 0, the current polarity of phase B as less than or equal to -20A, and the current polarity of phase C as greater than or equal to 20A.

[0062] Specifically, the above scheme calibrates the injected voltage amplitude: when the prerequisites are met, the voltage vector (Uamp, theta) is injected in the Alfa / Beta two-phase stationary coordinate system, and the voltage amplitude Uamp is adjusted at the three angles shown in Table 1 below to ensure that the absolute value of the non-zero phase current in the three-phase current is greater than or equal to 20A.

[0063] Specifically, the voltage injection time at each angle is 20ms. The first 15ms is for waiting for the current to build up, and the last 5ms is for collecting the non-zero phase current and calculating the average value during this period. The entire process lasts 60ms.

[0064] Table 1

[0065]

[0066] It should be noted that the embodiment of the present application takes into account that when there is a phase loss fault, the absolute value of the fault phase current will be less than 10A (the above value checks the error, which is theoretically 0A). In order to distinguish the fault state, under normal circumstances, the injected current of each phase needs to be greater than 10A. Therefore, in order to prevent misjudgment, a margin needs to be left, and the target current value is 20A.

[0067] The above preset angles can cover the minimum injection angles of the six bridge arms, fully covering the entire system while compressing the self-test process time to a minimum. Furthermore, the injected DC low-frequency signal has no high-frequency noise compared to the high-frequency current signal.

[0068] S103: Determine a phase loss state based on the three-phase current values ​​at the preset angle.

[0069] The above step S103 further includes S1031 and S1032:

[0070] S1031. When the preset angle is 30° and the average current value of phase A is less than 10A, it is determined that the upper bridge of phase A is missing; when the preset angle is 30° and the average current value of phase C is greater than -10A, it is determined that the lower bridge of phase C is missing; when the preset angle is 150° and the average current value of phase A is greater than -10A, it is determined that the lower bridge of phase A is missing; when the preset angle is 150° and the average current value of phase B is less than 10A, it is determined that the upper bridge of phase B is missing; when the preset angle is 270° and the average current value of phase B is greater than -10A, it is determined that the lower bridge of phase B is missing; when the preset angle is 270° and the average current value of phase C is less than 10A, it is determined that the upper bridge of phase C is missing.

[0071] For example, when theta is 30°, if the average current of phase A is less than 10A, the upper bridge of phase A is determined to be phase-lost; if the average current of phase C is greater than -10A, the lower bridge of phase C is determined to be phase-lost. When theta is 150°, if the average current of phase A is greater than -10A, the lower bridge of phase A is determined to be phase-lost; if the average current of phase B is less than 10A, the upper bridge of phase B is determined to be phase-lost. When theta is 270°, if the average current of phase B is greater than -10A, the lower bridge of phase B is determined to be phase-lost; if the average current of phase C is less than 10A, the upper bridge of phase C is determined to be phase-lost.

[0072] Based on the above scheme, if any of the upper and lower bridges ABC is judged to be phase-missing, the self-detection failure flag is set to 1, otherwise it is set to 0. After the judgment is completed, the completion flag SelfDetect_Flag is set to 1.

[0073] Based on the above scheme, three short-time currents are injected, covering six bridge arms with three phases and two polarities. The injected signals are obtained through calibration and do not depend on motor parameters, ensuring the accuracy of the judgment of each bridge arm.

[0074] S1032. When the number of phase loss events is greater than zero and less than a preset number, the power supply chip of the target vehicle's microcontroller is reset and restarted; when the number of phase loss events is greater than a preset number, the controller is controlled to enter a fault shutdown state.

[0075] Furthermore, the existing solution is not only relatively complex in its determination method, but also after determining a phase failure, the electric drive immediately enters a safety protection state to ensure the safety of the entire vehicle, but it also brings the problem of the entire vehicle breaking down.

[0076] To address the above issues, the present embodiment of the present invention resets the fault counter when the phase loss self-test failure flag is determined to be 0; and increments the fault counter by 1 when the phase loss self-test failure flag is determined to be 1. The counter value is then stored in non-volatile memory. Furthermore, if the fault counter is less than 3, the controller's power supply chip is reset and restarted, and the fault condition is resolved after the restart. When the fault counter is greater than or equal to 3, the controller enters a fault shutdown state.

[0077] After the controller restarts, it reads the fault count from the non-volatile memory as the initial count value. At the same time, because the phase loss self-test completion flag, SelfDetect_Flag, is cleared after the restart, the controller will perform the self-test function again. Therefore, if the self-test fails three times in a row, the controller will enter the fault shutdown state. Otherwise, the entire self-test process is completed and passed.

[0078] The fault recovery strategy designed above, when a phase loss is detected, repowers the controller to resolve the fault state. After identifying the fault, the appropriate strategy is implemented to resolve the abnormal state while ensuring vehicle safety, allowing the electric drive to continue operating. This not only avoids the risk of damage to the control ball caused by phase loss, but also avoids the risk of phase loss caused by software and hardware power-up timing issues, which could lead to vehicle breakdown. This solution can resolve phase loss issues caused by internal or external environmental interference or software or hardware bugs during the power-up process.

[0079] By utilizing the above-mentioned technical solution, the present invention provides a static phase loss self-test method for electric vehicle electric drives. This method determines the phase loss state of the electric drive by injecting three short-term currents. When a phase loss state is detected, the electric drive controller is restarted and self-test is performed again after the restart. Combined with speed determination, this method avoids the possibility of misjudgment during dynamic self-tests. By calibrating the injected voltage amplitude, the self-test process's dependence on motor parameters is resolved. By adjusting the angles of the three injected voltages to cover the six bridge arms of the electric drive's three phases and two polarities, noise introduced by high-frequency voltage injection during the self-test process is avoided. A restart strategy is implemented to avoid the risk of electric drive phase loss, which could lead to vehicle breakdown, due to software and hardware power-on timing issues. This method has high accuracy, a short duration, and no high-frequency noise during the detection process. When a controller anomaly is detected, the controller is restarted to resolve the phase loss problem caused by software and hardware anomalies during the power-on process, preventing the controller from entering a fault shutdown state, which could cause the vehicle to break down. This method is applicable to the power-on self-test function of all automotive motors, and the process can be standardized.

[0080] Furthermore, as a response to the above Figure 1 In order to realize the method shown in the figure, the embodiment of the present invention also provides a static phase loss self-detection device for electric vehicle electric drive, which is used to detect the above Figure 1This device embodiment corresponds to the aforementioned method embodiment. For ease of reading, this device embodiment will not describe the details of the aforementioned method embodiment one by one, but it should be clear that the device in this embodiment can implement all the contents of the aforementioned method embodiment. Figure 3 As shown, the device includes: an injection unit 21, an adjustment unit 22 and a determination unit 23, wherein

[0081] The injection unit 21 is used to inject a voltage vector into a two-phase stationary coordinate system when the target vehicle meets the phase loss self-test prerequisite;

[0082] an adjusting unit 22 for adjusting the voltage amplitude based on a preset angle until the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value;

[0083] The determining unit 23 is configured to determine a phase loss state based on the three-phase current values ​​at the preset angle.

[0084] The processor includes a core, which retrieves corresponding program units from memory. One or more cores can be provided, and a method for self-detecting static phase loss in an electric vehicle's electric drive is implemented by adjusting core parameters. This method can address the lack of a better self-detection method for static phase loss in an electric vehicle's electric drive.

[0085] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program. When the program is executed by a processor, the electric vehicle electric drive static phase loss self-detection method is implemented.

[0086] An embodiment of the present invention provides a processor, which is used to run a program, wherein the electric vehicle electric drive static phase loss self-test method is executed when the program is running.

[0087] An embodiment of the present invention provides an electronic device, comprising at least one processor and at least one memory connected to the processor; wherein the processor is configured to call program instructions in the memory to execute the above-mentioned electric vehicle electric drive static phase loss self-test method.

[0088] An embodiment of the present invention provides an electronic device 30, such as Figure 4 As shown, the electronic device includes at least one processor 301, and at least one memory 302 and a bus 303 connected to the processor; wherein the processor 301 and the memory 302 communicate with each other through the bus 303; the processor 301 is used to call the program instructions in the memory to execute the above-mentioned electric vehicle electric drive static phase loss self-test method.

[0089] The intelligent electronic devices in this article can be PCs, PADs, mobile phones, etc.

[0090] The present application also provides a computer program product which, when executed on a process management electronic device, is suitable for executing a program that initializes the steps of the above-mentioned electric vehicle electric drive static phase loss self-test method.

[0091] It should be noted that, in the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0092] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0093] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0094] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0095] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0096] The present application also provides a computer program product, which includes computer software instructions. When the computer software instructions are executed on a processing device, the processing device is caused to execute the following Figure 1 This corresponds to the flow of memory control in the embodiment.

[0097] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server or data center that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state drive (SSD)).

[0098] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0099] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0100] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0101] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0102] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0103] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A static phase loss self-test method for electric vehicle electric drive, characterized in that: include: When the target vehicle meets the phase loss self-test prerequisite, the voltage vector is injected into the two-phase stationary coordinate system; Adjusting the voltage amplitude based on a preset angle until the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value; determining a phase loss state based on the three-phase current values ​​at the preset angle; The step of adjusting the voltage amplitude based on the preset angle until the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value includes: When the preset angle is 30°, the current polarity of phase A is defined as greater than or equal to 20A, the current polarity of phase B is defined as 0, and the current polarity of phase C is defined as less than or equal to -20A. When the preset angle is 150°, the current polarity of phase A is defined as less than or equal to -20A, the current polarity of phase B is defined as greater than or equal to 20A, and the current polarity of phase C is defined as 0; When the preset angle is 270°, the current polarity of phase A is defined as 0, the current polarity of phase B is less than or equal to -20A, and the current polarity of phase C is greater than or equal to 20A; The determining of the phase loss state based on the three-phase current values ​​at the preset angle includes: When the preset angle is 30° and the average current of phase A is less than 10A, it is determined that the upper bridge of phase A is missing. When the preset angle is 30° and the average current of phase C is greater than -10A, it is determined that the lower bridge of phase C is missing. When the preset angle is 150° and the average current of phase A is greater than -10A, it is determined that the lower bridge of phase A is missing. When the preset angle is 150° and the average current of phase B is less than 10A, it is determined that the upper bridge of phase B is missing. When the preset angle is 270° and the average current of phase B is greater than -10A, it is determined that the lower bridge of phase B is missing; When the preset angle is 270° and the average current of phase C is less than 10A, it is determined that the upper bridge of phase C is missing.

2. The method according to claim 1, characterized in that Also includes: Obtaining the gear status, brake status, high voltage status, controller status, and bus voltage of the target vehicle; When the gear state is P gear, the brake state is pulled up, the high voltage state is activated, the controller state is ready and the bus voltage is greater than the control minimum operating voltage, it is determined that the target vehicle meets the phase loss self-test prerequisite.

3. The method according to claim 2, characterized in that Also includes: Obtaining the motor speed of the target vehicle; When the motor speed is less than a preset speed, it is determined that the target vehicle meets the phase loss self-check prerequisite.

4. The method according to claim 1, wherein The step of adjusting the voltage amplitude based on the preset angle until the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value includes: Controlling the voltage amplitude to increase gradually with a preset step size based on a preset angle until the absolute value of a non-zero phase current in the three-phase current is greater than or equal to a target current value; The voltage amplitude is recorded when the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value.

5. The method according to claim 1, wherein Also includes: When the number of phase failures is greater than zero and less than a preset number, resetting and restarting the power supply chip of the target vehicle's micro controller; When the number of phase failures is greater than a preset number, the controller is controlled to enter a fault shutdown state.

6. A static phase loss self-detection device for electric vehicle electric drive, characterized in that: Also includes: An injection unit is used to inject a voltage vector into a two-phase stationary coordinate system when the target vehicle meets the phase loss self-test prerequisite; an adjusting unit, configured to adjust the voltage amplitude based on a preset angle until the absolute value of a non-zero phase current in the three-phase current is greater than or equal to a target current value; a determining unit, configured to determine a phase loss state based on the three-phase current values ​​at the preset angle; The step of adjusting the voltage amplitude based on the preset angle until the absolute value of the non-zero phase current in the three-phase current is greater than or equal to the target current value includes: When the preset angle is 30°, the current polarity of phase A is defined as greater than or equal to 20A, the current polarity of phase B is defined as 0, and the current polarity of phase C is defined as less than or equal to -20A. When the preset angle is 150°, the current polarity of phase A is defined as less than or equal to -20A, the current polarity of phase B is defined as greater than or equal to 20A, and the current polarity of phase C is defined as 0; When the preset angle is 270°, the current polarity of phase A is defined as 0, the current polarity of phase B is less than or equal to -20A, and the current polarity of phase C is greater than or equal to 20A; The determining of the phase loss state based on the three-phase current values ​​at the preset angle includes: When the preset angle is 30° and the average current of phase A is less than 10A, it is determined that the upper bridge of phase A is missing. When the preset angle is 30° and the average current of phase C is greater than -10A, it is determined that the lower bridge of phase C is missing. When the preset angle is 150° and the average current of phase A is greater than -10A, it is determined that the lower bridge of phase A is missing. When the preset angle is 150° and the average current of phase B is less than 10A, it is determined that the upper bridge of phase B is missing. When the preset angle is 270° and the average current of phase B is greater than -10A, it is determined that the lower bridge of phase B is missing; When the preset angle is 270° and the average current of phase C is less than 10A, it is determined that the upper bridge of phase C is missing.

7. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored program, wherein when the program is executed by a processor, the steps of the electric vehicle electric drive static phase loss self-detection method according to any one of claims 1 to 5 are implemented.

8. An electronic device, characterized in that: The electronic device includes at least one processor and at least one memory connected to the processor; wherein the processor is used to call the program instructions in the memory to execute the steps of the electric vehicle electric drive static phase loss self-detection method according to any one of claims 1 to 5.

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