A method, device and equipment for detecting motor phase loss fault

Abstract

The present invention provides a method, device, and equipment for detecting a motor phase loss fault. The motor phase loss fault detection method comprises: inputting a pulse voltage to a first target phase in a drive motor of the vehicle when the vehicle is in a high-voltage power-on state; and determining a phase loss fault detection result of the drive motor based on a current fed back from at least one of the three target phases of the drive motor; wherein the at least one target phase includes the first target phase. The scheme of the present invention, by inputting a pulse voltage to a first target phase in a drive motor of the vehicle when the vehicle is in a power-on state, and determining a phase loss fault detection result of the drive motor based on a current fed back from at least one of the three target phases of the drive motor, that is, determining whether a phase loss fault occurs in the drive motor, can achieve the purpose of timely detecting a motor phase loss fault and improve driving safety.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a method, device and equipment for detecting a motor phase loss fault. Background Art

[0002] For electric vehicles, three-phase AC motors are mainly used as driving motors. If the three-phase circuit is loose, the motor may be short-circuited, that is, one or more phases of the motor may be broken, which will cause torque jitter and abnormal noise. In severe cases, overcurrent faults may occur, causing the vehicle to be unable to drive, affecting driving safety.

[0003] Therefore, it is necessary to design a motor phase loss fault detection method to detect whether the motor has a phase loss fault. Summary of the Invention

[0004] The embodiments of the present invention provide a method, device and apparatus for detecting a phase loss fault of a motor, so as to solve the problem in the prior art that a phase loss fault of a motor cannot be detected in a timely manner.

[0005] In order to solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0006] An embodiment of the present invention provides a method for detecting a motor phase loss fault, comprising:

[0007] When the vehicle is powered on at high voltage, inputting a pulse voltage to a first target phase of a drive motor of the vehicle;

[0008] determining a phase failure detection result of the drive motor according to a current fed back from at least one target phase among the three target phases of the drive motor;

[0009] Wherein, the at least one target phase includes the first target phase.

[0010] Optionally, determining a phase loss fault detection result of the drive motor according to a current fed back from at least one of three target phases of the drive motor includes:

[0011] In the case where the first target phase feedback current and the second target phase feedback current are both obtained, determining a phase failure detection result of the drive motor according to the current fed back by the third target phase;

[0012] Wherein, the at least one target phase further includes the second target phase and the third target phase.

[0013] Optionally, determining a phase loss fault detection result of the drive motor according to the current fed back by the third target phase includes:

[0014] In the case of the third target phase feedback current, determining that the phase loss fault detection result is that no phase loss fault occurs;

[0015] In a case where the third target phase does not feed back current, it is determined that the phase loss fault detection result is a third target phase loss fault.

[0016] Optionally, determining a phase loss fault detection result of the drive motor according to a current fed back from at least one of three target phases of the drive motor includes:

[0017] When the first target phase feeds back current and the second target phase does not feed back current, determining that the phase loss fault detection result is a second target phase loss fault;

[0018] Wherein, the at least one target phase further includes the second target phase.

[0019] Optionally, determining a phase loss fault detection result of the drive motor according to a current fed back from at least one of three target phases of the drive motor includes:

[0020] In a case where the first target phase does not feed back current, it is determined that the phase loss fault detection result is that a phase loss fault occurs.

[0021] Optionally, when the first target phase does not feed back current, after determining that the phase loss fault detection result is a phase loss fault, the method further includes:

[0022] inputting a pulse voltage to a second target phase in the drive motor;

[0023] determining a phase failure detection result of the drive motor according to the current fed back by the second target phase;

[0024] Wherein, the at least one target phase further includes the second target phase.

[0025] Optionally, determining a phase loss fault detection result of the drive motor according to the current fed back by the second target phase includes:

[0026] In the case of the second target phase feedback current, determining that the phase loss fault detection result is a first target phase loss fault;

[0027] In a case where the second target phase does not feed back current, it is determined that the phase loss fault detection result is a three-phase loss fault.

[0028] Optionally, the method further includes:

[0029] When the current value of the target phase feedback is less than the first value, determining the target phase feedback current;

[0030] In a case where the current value fed back by the target phase is greater than the second value, it is determined that the target phase does not feed back current.

[0031] An embodiment of the present invention further provides a motor phase loss fault detection device, comprising:

[0032] an input module, configured to input a pulse voltage to a first target phase of a drive motor on the vehicle when the vehicle is powered on at high voltage;

[0033] a first determining module, configured to determine a phase loss fault detection result of the drive motor according to a current fed back from at least one target phase among the three target phases of the drive motor;

[0034] Wherein, the at least one target phase includes the first target phase.

[0035] Optionally, the first determining module includes:

[0036] a first determining unit, configured to determine a phase failure detection result of the drive motor according to a current fed back by a third target phase when the first target phase feeds back a current and the second target phase feeds back a current;

[0037] Wherein, the at least one target phase further includes the second target phase and the third target phase.

[0038] Optionally, the first determining unit is specifically configured to:

[0039] In the case of the third target phase feedback current, determining that the phase loss fault detection result is that no phase loss fault occurs;

[0040] In a case where the third target phase does not feed back current, it is determined that the phase loss fault detection result is a third target phase loss fault.

[0041] Optionally, the first determining module includes:

[0042] a second determining unit, configured to determine that the phase loss fault detection result is a second target phase loss fault when the first target phase feeds back current and the second target phase does not feed back current;

[0043] Wherein, the at least one target phase further includes the second target phase.

[0044] Optionally, the first determining module includes:

[0045] The third determining unit is configured to determine that the phase loss fault detection result is a phase loss fault when the first target phase does not feed back current.

[0046] Optionally, the first determining module further includes:

[0047] an input unit, configured to input a pulse voltage to a second target phase in the drive motor;

[0048] a fourth determining unit, configured to determine a phase loss fault detection result of the drive motor according to the current fed back by the second target phase;

[0049] Wherein, the at least one target phase further includes the second target phase.

[0050] Optionally, the fourth determining unit is specifically configured to:

[0051] In the case of the second target phase feedback current, determining that the phase loss fault detection result is a first target phase loss fault;

[0052] In a case where the second target phase does not feed back current, it is determined that the phase loss fault detection result is a three-phase loss fault.

[0053] Optionally, the device further comprises:

[0054] a second determining module, configured to determine the target phase feedback current when the current value of the target phase feedback is less than the first value;

[0055] The third determining module is configured to determine that the target phase does not feed back current when the current value fed back by the target phase is greater than the second value.

[0056] An embodiment of the present invention also provides a motor phase loss fault detection device, comprising: a processor, a memory, and a program stored in the memory and executable on the processor, wherein when the program is executed by the processor, the steps of the motor phase loss fault detection method as described above are implemented.

[0057] An embodiment of the present invention further provides a readable storage medium having a program stored thereon. When the program is executed by a processor, the steps in the motor phase loss fault detection method as described above are implemented.

[0058] The beneficial effects of the present invention are:

[0059] The solution of the present invention inputs a pulse voltage to the first target phase in the vehicle's drive motor when the vehicle is in a powered-on state, and determines the phase loss fault detection result of the drive motor based on the current fed back from at least one target phase among the three target phases of the drive motor, that is, determines whether the drive motor has a phase loss fault, thereby achieving the purpose of timely detecting the motor phase loss fault and improving driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1A flowchart showing a method for detecting a motor phase loss fault according to an embodiment of the present invention;

[0061] Figure 2 A schematic diagram showing the structure of a drive motor provided by an embodiment of the present invention;

[0062] Figure 3 A second flowchart of a method for detecting a motor phase loss fault according to an embodiment of the present invention is shown;

[0063] Figure 4 A schematic diagram showing the structure of a motor phase loss fault detection device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0064] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0065] The present invention aims to solve the problem in the prior art that a phase loss fault of a motor cannot be detected in time, and provides a method, device and equipment for detecting a phase loss fault of a motor.

[0066] like Figure 1 As shown, an embodiment of the present invention provides a method for detecting a motor phase loss fault, comprising:

[0067] Step 101: When a vehicle is powered on at high voltage, a pulse voltage is input to a first target phase of a drive motor of the vehicle.

[0068] In this step, a pulse voltage in a specific direction is input to the drive motor, that is, a pulse voltage is input to the first target phase of the drive motor to detect whether the drive motor has a phase loss fault.

[0069] For example, see Figure 2 , Figure 2 is the structural diagram of the drive motor. Figure 2 The "+" in the figure represents the positive pole of the three-phase AC coil in the drive motor, and the "-" represents the negative pole of the three-phase AC coil in the drive motor. The direction of the arrow is the direction of the pulse voltage, that is, the pulse voltage is input to the U phase (first target phase) in the drive motor.

[0070] Step 102: determining a phase failure detection result of the drive motor according to a current fed back from at least one target phase among the three target phases of the drive motor;

[0071] Wherein, the at least one target phase includes the first target phase.

[0072] It should be noted that after the vehicle is powered on at high voltage and a pulse voltage is input to the U phase (first target phase) of the drive motor, if the current sensor feeds back that there is current in all three phases (U phase, V phase, and W phase) of the drive motor, it is determined that the drive motor has no phase loss fault; if the current sensor feeds back that there is no current in the U phase, it is determined that the drive motor has a phase loss fault, and based on the current feedback results of the V phase and the W phase, it is determined in which phase the specific fault occurs.

[0073] This embodiment of the present invention detects whether the drive motor has a phase loss fault based on the current feedback from the drive motor by inputting a pulse current in a specific direction (such as the U phase) into the drive motor, thereby improving driving safety. Due to the small pulse current amplitude and short power-on time, the system does not cause vehicle vibration or abnormal noise. Furthermore, the detection time is very short and can be completed simultaneously with the high-voltage power-on self-test.

[0074] As a preferred embodiment, determining a phase loss fault detection result of the drive motor according to current fed back from at least one of the three target phases of the drive motor includes:

[0075] In the case where the first target phase feedback current and the second target phase feedback current are both obtained, determining a phase failure detection result of the drive motor according to the current fed back by the third target phase;

[0076] Wherein, the at least one target phase further includes the second target phase and the third target phase.

[0077] In an embodiment of the present invention, if current is fed back in the first target phase (U phase), it is determined whether current is fed back in the second target phase (V phase); if it is determined that current is fed back in the second target phase (V phase), it is determined whether current is fed back in the third target phase (W phase), and the phase loss fault detection result of the drive motor is determined based on the judgment result.

[0078] Specifically, determining a phase loss fault detection result of the drive motor according to the current fed back by the third target phase includes:

[0079] In the case of the third target phase feedback current, determining that the phase loss fault detection result is that no phase loss fault occurs;

[0080] In a case where the third target phase does not feed back current, it is determined that the phase loss fault detection result is a third target phase loss fault.

[0081] That is, when the first target phase (U phase) feeds back current and the second target phase (V phase) feeds back current, if the third target phase (W phase) feeds back current, then all three phases feed back current, and the phase loss fault detection result is determined to be no phase loss fault. If the third target phase (W phase) does not feed back current, then the phase loss fault detection result is determined to be a third target phase loss fault, that is, a W phase fault.

[0082] As a preferred embodiment, determining a phase loss fault detection result of the drive motor according to current fed back from at least one of the three target phases of the drive motor includes:

[0083] When the first target phase feeds back current and the second target phase does not feed back current, determining that the phase loss fault detection result is a second target phase loss fault;

[0084] Wherein, the at least one target phase further includes the second target phase.

[0085] It should be noted that according to Kirchhoff's current law, we can get:

[0086] I U +I V +I W =0

[0087] Among them, I U is the current fed back by phase U, I V is the V-phase feedback current, I W is the current fed back from phase W. As the above formula shows, as long as current is detected in one phase, then at least one of the other two phases will have current. This characteristic simplifies the detection process.

[0088] In an embodiment of the present invention, when the first target phase (U phase) has feedback current, but the second target phase (V phase) has no feedback current, it can be seen from the above formula that the third target phase (W phase) must have feedback current. Therefore, the phase loss fault detection result is directly judged to be a second target phase loss fault, that is, a V phase fault.

[0089] As a preferred embodiment, determining a phase loss fault detection result of the drive motor according to current fed back from at least one of the three target phases of the drive motor includes:

[0090] In a case where the first target phase does not feed back current, it is determined that the phase loss fault detection result is that a phase loss fault occurs.

[0091] Similarly, it can be seen from the above formula that when the first target phase (U phase) does not feedback current, there may be two situations. The first situation is that the second target phase (V phase) and the third target phase (W phase) do not feedback current; the second situation is that the second target phase (V phase) and the third target phase (W phase) both feedback current. In these two situations, the phase loss fault detection result is that a phase loss fault occurs.

[0092] Furthermore, when the first target phase does not feed back current, after determining that the phase loss fault detection result is a phase loss fault, the method further includes:

[0093] inputting a pulse voltage to a second target phase in the drive motor;

[0094] determining a phase failure detection result of the drive motor according to the current fed back by the second target phase;

[0095] Wherein, the at least one target phase further includes the second target phase.

[0096] Specifically, when the first target phase (U phase) does not feedback current, a pulse voltage is input to the second target phase (V phase), and the specific phase that has failed is determined based on the current feedback result of the second target phase (V phase).

[0097] Furthermore, determining a phase failure detection result of the drive motor according to the current fed back by the second target phase includes:

[0098] In the case of the second target phase feedback current, determining that the phase loss fault detection result is a first target phase loss fault;

[0099] In a case where the second target phase does not feed back current, it is determined that the phase loss fault detection result is a three-phase loss fault.

[0100] That is, when the first target phase (U phase) does not feedback current, after the pulse voltage is input to the second target phase (V phase), if the second target phase (V phase) feeds back current, it is determined that the third target phase (W phase) must have current, and the phase loss fault detection result is determined to be a first target phase loss fault, that is, a U phase fault; if the second target phase (V phase) does not feed back current, it is determined that the third target phase (W phase) must have no current, and the phase loss fault detection result is determined to be a three-phase loss fault, that is, faults occur in U phase, V phase, and W phase.

[0101] It should be noted that when the motor phase loss is greater than or equal to two phases, there is no conduction circuit, so there is no difference between two phase loss and three phase loss.

[0102] Optionally, the method further includes:

[0103] When the current value of the target phase feedback is less than the first value, determining the target phase feedback current;

[0104] In a case where the current value fed back by the target phase is greater than the second value, it is determined that the target phase does not feed back current.

[0105] It should be noted that, taking into account the sampling error of the current sensor and the accuracy of phase loss detection, in this embodiment of the present invention, when the set current value is less than a first value (optionally, 5A), it is determined that there is no feedback current, and when the set current value is greater than a second value (optionally, 10A), it is determined that there is feedback current. This method increases current accuracy redundancy and does not require waiting for the current to stabilize before making a judgment. As long as the current reaches the set condition, the detection ends. When the drive motor does not have a phase loss fault, it can significantly shorten the detection time.

[0106] The following combination Figure 3 , specifically explain the motor phase loss fault detection method.

[0107] Step 1: Apply pulse voltage to the U phase; Step 2: When it is determined that the U phase has current feedback, continue to determine whether the V phase has current feedback; Step 3: If the V phase has current feedback, continue to determine whether the W phase has current feedback; Step 4: If the W phase has current, determine that there is no phase loss fault; Step 5: If the W phase does not feedback current in step 3, determine that the W phase is faulty; Step 6: If there is no current in the V phase in step 2, determine that the V phase is faulty (because the prerequisite is that the U phase has current feedback, if the V phase has no current feedback, then the W phase has current feedback, and the V phase is directly judged to be faulty); Step 7: If the U phase does not feedback current in step 1, it is necessary to switch the power supply direction, add test conditions for judgment, and apply pulse voltage to the V phase; Step 8: If there is current feedback from the V phase in step 7, determine that the U phase is faulty; Step 9: If there is no current feedback from the V phase in step 7, determine that the three-phase fault is.

[0108] Depending on the fault detection requirements, the order of the above steps, that is, the detection logic, can be adjusted. If you need to determine whether the drive motor has a phase loss fault, you can check it according to steps 1-6. If you need to accurately locate the phase where the fault occurs, you need to check according to steps 1-9.

[0109] It should also be noted that the motor phase loss fault detection method provided by the embodiment of the present invention does not require additional hardware support and has a short detection time, which can be completed within 100ms.

[0110] like Figure 4 As shown, an embodiment of the present invention further provides a motor phase loss fault detection device, comprising:

[0111] An input module 401 is configured to input a pulse voltage to a first target phase of a drive motor on the vehicle when the vehicle is powered on at high voltage;

[0112] A first determining module 402 is configured to determine a phase loss fault detection result of the drive motor according to a current fed back from at least one target phase among the three target phases of the drive motor;

[0113] Wherein, the at least one target phase includes the first target phase.

[0114] The motor phase loss fault detection device provided by an embodiment of the present invention inputs a pulse voltage to the first target phase in the vehicle's drive motor when the vehicle is in a powered-on state, and determines the phase loss fault detection result of the drive motor based on the current fed back from at least one target phase among the three target phases of the drive motor. That is, it determines whether the drive motor has a phase loss fault, which can achieve the purpose of timely detecting the motor phase loss fault and improve driving safety.

[0115] Optionally, the first determining module 402 includes:

[0116] a first determining unit, configured to determine a phase failure detection result of the drive motor according to a current fed back by a third target phase when the first target phase feeds back a current and the second target phase feeds back a current;

[0117] Wherein, the at least one target phase further includes the second target phase and the third target phase.

[0118] Optionally, the first determining unit is specifically configured to:

[0119] In the case of the third target phase feedback current, determining that the phase loss fault detection result is that no phase loss fault occurs;

[0120] In a case where the third target phase does not feed back current, it is determined that the phase loss fault detection result is a third target phase loss fault.

[0121] Optionally, the first determining module 402 includes:

[0122] a second determining unit, configured to determine that the phase loss fault detection result is a second target phase loss fault when the first target phase feeds back current and the second target phase does not feed back current;

[0123] Wherein, the at least one target phase further includes the second target phase.

[0124] Optionally, the first determining module 402 includes:

[0125] The third determining unit is configured to determine that the phase loss fault detection result is a phase loss fault when the first target phase does not feed back current.

[0126] Optionally, the first determining module 402 further includes:

[0127] an input unit, configured to input a pulse voltage to a second target phase in the drive motor;

[0128] a fourth determining unit, configured to determine a phase loss fault detection result of the drive motor according to the current fed back by the second target phase;

[0129] Wherein, the at least one target phase further includes the second target phase.

[0130] Optionally, the fourth determining unit is specifically configured to:

[0131] In the case of the second target phase feedback current, determining that the phase loss fault detection result is a first target phase loss fault;

[0132] In a case where the second target phase does not feed back current, it is determined that the phase loss fault detection result is a three-phase loss fault.

[0133] Optionally, the device further comprises:

[0134] a second determining module, configured to determine the target phase feedback current when the current value of the target phase feedback is less than the first value;

[0135] The third determining module is configured to determine that the target phase does not feed back current when the current value fed back by the target phase is greater than the second value.

[0136] It should be noted that the motor phase loss fault detection device provided in the embodiment of the present invention is a device capable of executing the above-mentioned motor phase loss fault detection method. Therefore, all embodiments of the above-mentioned motor phase loss fault detection method are only used for this device and can achieve the same or similar technical effects.

[0137] An embodiment of the present invention also provides a motor phase loss fault detection device, including a processor and a memory; the memory is used to store programs and data used by the processor when performing operations, and the processor calls and executes the programs and data stored in the memory.

[0138] The motor phase loss fault detection device further includes a transceiver, which is used to receive and send data under the control of the processor.

[0139] Specifically, the processor is configured to:

[0140] When the vehicle is powered on at high voltage, inputting a pulse voltage to a first target phase of a drive motor of the vehicle;

[0141] determining a phase failure detection result of the drive motor according to a current fed back from at least one target phase among the three target phases of the drive motor;

[0142] Wherein, the at least one target phase includes the first target phase.

[0143] Optionally, the processor is specifically configured to:

[0144] In the case where the first target phase feedback current and the second target phase feedback current are both obtained, determining a phase failure detection result of the drive motor according to the current fed back by the third target phase;

[0145] Wherein, the at least one target phase further includes the second target phase and the third target phase.

[0146] Optionally, the processor is specifically configured to:

[0147] In the case of the third target phase feedback current, determining that the phase loss fault detection result is that no phase loss fault occurs;

[0148] In a case where the third target phase does not feed back current, it is determined that the phase loss fault detection result is a third target phase loss fault.

[0149] Optionally, the processor is specifically configured to:

[0150] When the first target phase feeds back current and the second target phase does not feed back current, determining that the phase loss fault detection result is a second target phase loss fault;

[0151] Wherein, the at least one target phase further includes the second target phase.

[0152] Optionally, the processor is specifically configured to:

[0153] In a case where the first target phase does not feed back current, it is determined that the phase loss fault detection result is that a phase loss fault occurs.

[0154] Optionally, when the first target phase does not feed back current, after the processor determines that the phase loss fault detection result is a phase loss fault, the processor is further configured to:

[0155] inputting a pulse voltage to a second target phase in the drive motor;

[0156] determining a phase failure detection result of the drive motor according to the current fed back by the second target phase;

[0157] Wherein, the at least one target phase further includes the second target phase.

[0158] Optionally, the processor is specifically configured to:

[0159] In the case of the second target phase feedback current, determining that the phase loss fault detection result is a first target phase loss fault;

[0160] In a case where the second target phase does not feed back current, it is determined that the phase loss fault detection result is a three-phase loss fault.

[0161] Optionally, the processor is further configured to:

[0162] When the current value of the target phase feedback is less than the first value, determining the target phase feedback current;

[0163] In a case where the current value fed back by the target phase is greater than the second value, it is determined that the target phase does not feed back current.

[0164] An embodiment of the present invention further provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the motor phase loss fault detection method as described above are implemented.

[0165] In addition, it should be noted that, in the apparatus and method of the present invention, it is obvious that each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present invention. Moreover, the steps of performing the above-mentioned series of processing can naturally be performed in chronological order according to the order of description, but it is not necessary to perform them in chronological order, and some steps can be performed in parallel or independently of each other. For those of ordinary skill in the art, it will be understood that all or any steps or components of the method and apparatus of the present invention can be implemented in any computing device (including processors, storage media, etc.) or a network of computing devices in hardware, firmware, software or a combination thereof, which can be achieved by those of ordinary skill in the art using their basic programming skills after reading the description of the present invention.

[0166] Therefore, the purpose of the present invention can also be achieved by running a program or a group of programs on any computing device. The computing device can be a well-known general-purpose device. Therefore, the purpose of the present invention can also be achieved simply by providing a program product containing program code that implements the method or device. That is to say, such a program product also constitutes the present invention, and the storage medium storing such a program product also constitutes the present invention. Obviously, the storage medium can be any well-known storage medium or any storage medium developed in the future. It should also be pointed out that in the device and method of the present invention, it is obvious that each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present invention. In addition, the steps of performing the above-mentioned series of processing can naturally be performed in chronological order according to the order of description, but do not necessarily need to be performed in chronological order. Certain steps can be performed in parallel or independently of each other.

[0167] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary personnel in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications are also within the scope of protection of the present invention.

Claims

1. A method for detecting a motor phase loss fault, characterized in that: include: When the vehicle is powered on at high voltage, inputting a pulse voltage to a first target phase of a drive motor of the vehicle; Determining a phase failure detection result of the drive motor according to a current fed back by at least one target phase among the three target phases of the drive motor; wherein the at least one target phase includes the first target phase; The step of determining a phase loss fault detection result of the drive motor according to a current fed back from at least one of the three target phases of the drive motor includes: In the case where the first target phase feeds back current and the second target phase feeds back current, determining a phase loss fault detection result of the drive motor according to the current fed back by the third target phase; wherein the at least one target phase further includes the second target phase and the third target phase; The step of determining a phase loss fault detection result of the drive motor according to the current fed back by the third target phase includes: In the case of the third target phase feedback current, determining that the phase loss fault detection result is that no phase loss fault occurs; In a case where the third target phase does not feedback current, determining that the phase loss fault detection result is a third target phase loss fault; The step of determining a phase loss fault detection result of the drive motor according to a current fed back from at least one of the three target phases of the drive motor includes: When the first target phase feeds back current and the second target phase does not feed back current, determining that the phase loss fault detection result is a second target phase loss fault; The first target phase is the U phase, the second target phase is the V phase, and the third target phase is the W phase.

2. The motor phase failure detection method according to claim 1, characterized in that: Determining a phase loss fault detection result of the drive motor according to a current fed back from at least one target phase among three target phases of the drive motor includes: In a case where the first target phase does not feed back current, it is determined that the phase loss fault detection result is that a phase loss fault occurs.

3. The motor phase failure detection method according to claim 2, characterized in that: In a case where the first target phase does not feed back current, after determining that the phase loss fault detection result is a phase loss fault, the method further includes: inputting a pulse voltage to a second target phase in the drive motor; determining a phase failure detection result of the drive motor according to the current fed back by the second target phase; Wherein, the at least one target phase further includes the second target phase.

4. The motor phase failure detection method according to claim 3, characterized in that: Determining a phase failure detection result of the drive motor according to the current fed back by the second target phase includes: In the case of the second target phase feedback current, determining that the phase loss fault detection result is a first target phase loss fault; In a case where the second target phase does not feed back current, it is determined that the phase loss fault detection result is a three-phase loss fault.

5. The motor phase failure detection method according to claim 1, characterized in that: The method further comprises: When the current value fed back by the target phase is less than the first value, determining that the target phase does not feed back current; In a case where the current value of the target phase feedback is greater than the second value, the target phase feedback current is determined.

6. A motor phase failure detection device, characterized in that: include: an input module, configured to input a pulse voltage to a first target phase of a drive motor on the vehicle when the vehicle is powered on at high voltage; a first determining module, configured to determine a phase loss fault detection result of the drive motor based on a current fed back from at least one target phase among the three target phases of the drive motor; wherein the at least one target phase includes the first target phase; The first determining module includes: a first determining unit, configured to determine a phase loss fault detection result of the drive motor according to a current fed back by a third target phase when the first target phase and the second target phase feed back a current; wherein the at least one target phase further includes the second target phase and the third target phase; The first determining unit is specifically configured to: In the case of the third target phase feedback current, determining that the phase loss fault detection result is that no phase loss fault occurs; In a case where the third target phase does not feedback current, determining that the phase loss fault detection result is a third target phase loss fault; The first determining module includes: a second determining unit, configured to determine that the phase loss fault detection result is a second target phase loss fault when the first target phase feeds back current and the second target phase does not feed back current; The first target phase is the U phase, the second target phase is the V phase, and the third target phase is the W phase.

7. A motor phase failure detection device, characterized in that: include: A processor, a memory, and a program stored in the memory and executable on the processor, wherein when the program is executed by the processor, the steps of the motor phase loss fault detection method according to any one of claims 1 to 5 are implemented.

8. A readable storage medium, characterized in that: The readable storage medium stores a program, and when the program is executed by the processor, the steps of the motor phase loss fault detection method according to any one of claims 1 to 5 are implemented.

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