Electric vehicle electric drive static open-phase self-checking method and related equipment

Abstract

The invention discloses an electric vehicle electric drive static open-phase self-checking method and related equipment, relates to the field of vehicle detection, and mainly aims to solve the problem that a better self-checking method for electric vehicle electric drive static open-phase lacks. The method comprises the steps of injecting a voltage vector in a two-phase static coordinate system under the condition that a target vehicle meets a default phase self-inspection precondition; 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 an open-phase state based on the three-phase current value at the preset angle. The method is used for the electric vehicle electric drive static open-phase self-checking process.

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 electric drive of an electric vehicle and related equipment. Background Art

[0002] The electrical architecture of electric vehicle usage scenarios and vehicle loads is relatively complex. During the power-on process, some controllers of the vehicle may have functional abnormalities due to changes in the external environment or changes in the internal initialization timing. Therefore, after the electric drive is powered on, the high and low voltages are usually self-checked, and if there is an abnormality, the vehicle enters a safe state to ensure the safety of the entire vehicle. At present, the common electric drive phase loss self-check relies on current for judgment, usually using high-frequency signal injection. There is noise during the detection process, and the current size is related to the motor stop angle and motor parameters. The judgment method is relatively complicated, so there is a lack of a better self-check method for static phase loss in the electric drive of electric vehicles. Summary of the invention

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

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

[0005] In the case where the target vehicle meets the phase-loss self-detection prerequisite, injecting a voltage vector into a 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 working voltage, it is determined that the target vehicle meets the phase loss self-detection 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 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 includes:

[0015] Controlling the voltage amplitude to increase gradually with a preset step length 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 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 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 defined as less than or equal to -20A, and the polarity of the C-phase current is defined as 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 microcontroller;

[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 electric drive of an electric vehicle, 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-detection 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 determination unit is used to determine the 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, wherein the computer-readable storage medium 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-detection method.

[0037] Through the above technical scheme, the static phase-loss self-detection method and related equipment of the electric drive of an electric vehicle provided by the present invention solve the problem of the lack of a better self-detection method for the static phase-loss of the electric drive of an electric vehicle. 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 realize 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 in 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 according to 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 listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

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

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

[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 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 is shown. DETAILED DESCRIPTION

[0045] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the 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. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated 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 electric vehicles, an embodiment of the present invention provides a self-detection method for static phase loss of electric drive of electric vehicles, such as Figure 1 As shown, the method includes:

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

[0048] The above step S101 also 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-detection prerequisite.

[0050] Exemplarily, the present application sets 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 in 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, obtaining the motor speed of the target vehicle; and determining that the target vehicle meets the phase loss self-check prerequisite when the motor speed is less than a preset speed.

[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 rotation speed, and the self-test is directly determined to be passed, thereby avoiding the possibility of misjudgment caused by self-test under 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 also includes S1021 and S1022:

[0060] S1021. Control the voltage amplitude to increase based on a preset angle and with 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 prerequisite is 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 in the following Table 1 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 used to wait for the current to be established, and the last 5ms is used to collect the non-zero phase current and calculate the average value during this period of time. The entire process lasts for 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, 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 process 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 also includes S1031 and S1032:

[0070] S1031. 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.

[0071] Exemplarily, the above-mentioned phase loss judgment is that when theta is 30°, if the average current value of phase A is less than 10A, it is determined that the upper bridge of phase A is phase-lost; if the average current value of phase C is greater than -10A, it is determined that the lower bridge of phase C is phase-lost. When theta is 150°, if the average current value of phase A is greater than -10A, it is determined that the lower bridge of phase A is phase-lost; if the average current value of phase B is less than 10A, it is determined that the upper bridge of phase B is phase-lost. When theta is 270°, if the average current value of phase B is greater than -10A, it is determined that the lower bridge of phase B is phase-lost; if the average current value of phase C is less than 10A, it is determined that the upper bridge of phase C is 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 sections of short-time current are injected, covering six bridge arms of three-phase and two-polarity. The injected signal is obtained through calibration and does not depend on the motor parameters, thus 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 complicated in the 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 about the problem of the entire vehicle breaking down.

[0076] Therefore, in view of the above problems, when the phase loss self-test failure flag is determined to be 0, the fault counter is cleared; when the phase loss self-test failure flag is determined to be 1, the fault counter is set to be plus 1. And the counter value is stored in a non-volatile memory. At the same time, when it is determined that the fault counter is less than 3, the power supply chip of the controller is reset and restarted, and the fault state is released after restarting. When the fault counter is greater than or equal to 3, the controller enters a fault shutdown state.

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

[0078] The above-designed fault recovery strategy, when a phase loss is detected, re-powers the controller to remove the fault state, and adopts a corresponding strategy after identifying the fault. On the premise of ensuring the safety of the entire vehicle, the abnormal state is removed so that the electric drive can continue to work, which not only avoids the risk of damage to the control ball caused by phase loss operation, but also avoids the risk of phase loss caused by software and hardware power-on timing problems, which in turn causes the entire vehicle to break down. The above solution can eliminate the phase loss problem caused by internal and external environmental interference or software and hardware bugs during the power-on process.

[0079] By means of the above technical scheme, the static phase-loss self-check method of the electric drive of the electric vehicle provided by the present invention determines the phase-loss state of the electric drive by injecting three short-time currents. When the phase-loss state is determined, the electric drive controller is restarted, and the self-check is performed again after restarting. Combined with the speed judgment, the possibility of misjudgment caused by self-checking in dynamic state is avoided; by calibrating the injection voltage amplitude, the dependence of the self-checking process on the motor parameters is solved; by adjusting the angle of the three-segment injection voltage to cover the six bridge arms of the three-phase two-polarity of the electric drive, the noise caused by the high-frequency voltage injection during the self-checking process is avoided; by the restart strategy, the risk of the electric drive phase-loss caused by the power-on timing problem of the software and hardware is avoided, and then the whole vehicle is broken down. It has high accuracy, short duration, and no high-frequency noise in the detection process. When it is determined that there is an abnormality in the controller, the controller is restarted to eliminate the phase-loss problem caused by the abnormality of the software and hardware during the power-on process, and prevent the controller from entering the fault shutdown state, thereby causing the whole vehicle to break down. This method can be applied to the power-on self-checking 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 drive of electric vehicle, which is used for Figure 1The device embodiment corresponds to the aforementioned method embodiment. For ease of reading, this device embodiment will not repeat the details of the aforementioned method embodiment one by one, but it should be clear that the device in this embodiment can correspond to 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] An 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-detection prerequisite;

[0082] An adjustment unit 22, 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;

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

[0084] The processor includes a kernel, and the kernel calls the corresponding program unit from the memory. One or more kernels can be set, and a static phase loss self-detection method for electric drive of electric vehicle is implemented by adjusting kernel parameters, which can solve the problem of lack of a better self-detection method for static phase loss of electric drive of electric vehicle.

[0085] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program, and 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-detection method is executed when the program is running.

[0087] An embodiment of the present invention provides an electronic device, the electronic device comprising at least one processor and at least one memory connected to the processor; wherein the processor is used to call program instructions in the memory to execute the above-mentioned electric vehicle electric drive static phase loss self-detection 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 via 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-detection 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 emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0092] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may 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 may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include 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 generate 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 capable of directing a computer or other programmable data processing device to operate 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 A 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 operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified 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 control of the memory in the embodiment.

[0097] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the 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 devices. 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 a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. 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 a data center that includes one or more available media integration. 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)), etc.

[0098] Those skilled in the art can 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 the present 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 only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, 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 interfaces, devices or units, which can be electrical, mechanical or other forms.

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

[0101] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of 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 to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. 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-detection method for electric vehicle electric drive, characterized in that: include: In the case where the target vehicle meets the phase-loss self-detection prerequisite, injecting a voltage vector into a 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; The phase loss state is determined based on the three-phase current values ​​at the preset angle.

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 working voltage, it is determined that the target vehicle meets the phase loss self-detection 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, characterized in that The voltage amplitude is adjusted 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, including: Controlling the voltage amplitude to increase gradually with a preset step length 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 4, characterized in that The voltage amplitude is adjusted 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, including: 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 polarity of the A-phase current is defined as 0, the polarity of the B-phase current is defined as less than or equal to -20A, and the polarity of the C-phase current is defined as greater than or equal to 20A.

6. The method according to claim 5, characterized in that The determining of the phase loss state based on the three-phase current value 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 value of phase C is less than 10A, it is determined that the upper bridge of phase C is missing.

7. The method according to claim 1, characterized in that 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 microcontroller; When the number of phase failures is greater than a preset number, the controller is controlled to enter a fault shutdown state.

8. 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-detection 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; The determination unit is used to determine the phase loss state based on the three-phase current values ​​at the preset angle.

9. 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 7 are implemented.

10. 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 as described in any one of claims 1 to 7.

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