Method and device for detecting high-voltage interlocking fault

Abstract

The invention relates to a high-voltage interlocking fault detection method and device which are applied to an air conditioner control system, the air conditioner control system comprises an air conditioner controller and an air conditioner compression motor, and the midpoint of each phase of bridge arm in three phases of bridge arms of the air conditioner controller is connected with different phases of the air conditioner compression motor. Each phase of bridge arm comprises an upper bridge arm switch tube and a lower bridge arm switch tube; the method comprises the steps that each bridge arm switch tube in a first switch tube combination used for detecting the high-voltage interlocking fault in three-phase bridge arms of the air conditioner controller is controlled to be switched on, so that first voltage, used for detecting the high-voltage interlocking fault, of the first divider resistor is generated at the two ends of each first divider resistor; and for each first divider resistor, according to a comparison result of a first voltage of the first divider resistor for detecting the high-voltage interlocking fault and a voltage threshold value, whether the high-voltage interlocking fault occurs in a motor phase corresponding to the first divider resistor is determined, and the motor phase corresponding to the first divider resistor is one phase of the air conditioner compression motor.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a method and device for detecting a high-voltage interlock fault. Background Art

[0002] With the continuous development of new energy technology, high voltage safety issues are crucial in the design of new energy vehicles. In order to reduce the safety hazards of high voltage systems, low voltage circuits are often used to monitor the status of high voltage components, wires and connectors, monitor the on and off conditions between various high voltage components of electric vehicles, and ensure the integrity and continuity of the high voltage system circuit. This method is called high voltage interlocking, also known as hard line interlocking.

[0003] However, the low-voltage interlock detection terminals currently used to detect high-voltage interlock signals may suffer from problems such as wire corrosion, oxidation, terminal deformation, and pin withdrawal after long-term operation, or the high-voltage interlock signal may be momentarily disconnected due to large vibrations caused by the vehicle running under harsh working conditions, causing the entire vehicle to falsely report a high-voltage interlock fault. In addition, the addition of low-voltage circuits leads to an increase in low-voltage wiring harnesses, low-voltage connectors, or detection chips, increasing system costs. When monitoring interlock faults in high-voltage components, the low-voltage circuit cannot accurately determine the specific component to determine whether the high-voltage system is abnormal by detecting the on-off status of high-voltage connectors, wires, and other components, resulting in the inability to determine the specific location of the interlock fault. Summary of the invention

[0004] In view of this, the present invention provides a method and device for detecting a high-voltage interlock fault.

[0005] According to a first aspect of the present invention, the present invention provides a method for detecting a high-voltage interlock fault, which is applied to an air-conditioning control system, the air-conditioning control system comprising an air-conditioning controller and an air-conditioning compressor motor, the midpoint of each phase bridge arm in the three-phase bridge arm of the air-conditioning controller is respectively connected to different phases of the air-conditioning compressor motor, and each phase bridge arm comprises an upper bridge arm switch tube and a lower bridge arm switch tube; the method comprises: controlling each bridge arm switch tube in a first switch tube combination for detecting a high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller to be turned on, so that a first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault is generated at both ends of each first voltage-dividing resistor; wherein each first voltage-dividing resistor is respectively connected to different bridge arm switch tubes in the first switch tube combination; for each first voltage-dividing resistor, determining whether a high-voltage interlock fault occurs in a motor phase corresponding to the first voltage-dividing resistor according to a comparison result between the first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault and a voltage threshold, the motor phase corresponding to the first voltage-dividing resistor being one phase of the air-conditioning compressor motor.

[0006] In one possible implementation, whether a high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor is determined based on a comparison result between the first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault and a voltage threshold, including: when the first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault is less than the voltage threshold, determining that a high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor.

[0007] In one possible implementation, determining whether a high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor based on a comparison result between a first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault and a voltage threshold includes: when the first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault is less than the voltage threshold, controlling each bridge arm switch tube in the first switch tube combination for detecting a high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller to be turned on again, so that a second voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault is generated at both ends of each first voltage-dividing resistor; when the first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault and the second voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault are both less than the voltage threshold, determining that a high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor; when the first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault is less than the voltage threshold and the second voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault is not less than the voltage threshold, determining that no high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor.

[0008] In one possible implementation, controlling each bridge arm switch tube in the first switch tube combination for detecting high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller to be turned on includes: controlling the bridge arm switch tube that is not connected to the first voltage-dividing resistor in the first switch tube combination to be turned on at a first moment; and controlling the bridge arm switch tube that is connected to the first voltage-dividing resistor in the first switch tube combination to be turned on at a second moment.

[0009] In one possible implementation, the air conditioning control system also includes a heating controller and a heating resistor; and the method also includes: controlling each switch tube in the second switch tube combination of the heating controller for detecting a high-voltage interlock fault to be turned on, so that a third voltage for detecting a high-voltage interlock fault is generated at both ends of each second voltage-dividing resistor, wherein each second voltage-dividing resistor is respectively connected to different switch tubes in the second switch tube combination; for each second voltage-dividing resistor, determining whether a high-voltage interlock fault occurs in a phase corresponding to the second voltage-dividing resistor based on a comparison result of the third voltage of the second voltage-dividing resistor for detecting a high-voltage interlock fault and a voltage threshold, wherein the phase corresponding to the second voltage-dividing resistor is a phase of the heating resistor; when the third voltage of the second voltage-dividing resistor for detecting a high-voltage interlock fault is less than the voltage threshold, determining that a high-voltage interlock fault occurs in the phase corresponding to the second voltage-dividing resistor.

[0010] In one possible implementation, the second switch tube combination includes at least two switch tubes, wherein each switch tube in the second switch tube combination for controlling the heating controller to detect a high-voltage interlock fault is turned on, including: controlling at least two switch tubes of the heating controller for detecting a high-voltage interlock fault to be turned on at the second moment.

[0011] In a possible implementation, the method also includes: when a high-voltage interlock fault occurs in a target phase, obtaining a specific fault location of the high-voltage interlock; wherein the target phase includes a motor phase corresponding to the first voltage-dividing resistor and / or a phase corresponding to the second voltage-dividing resistor; based on the high-voltage interlock fault location, determining a high-voltage interlock fault handling strategy corresponding to the high-voltage interlock fault location.

[0012] In one possible implementation, based on the high-voltage interlock fault position, a high-voltage interlock fault handling strategy corresponding to the high-voltage interlock fault position is determined, including: if the high-voltage interlock fault position is the motor phase corresponding to the first voltage-dividing resistor, the high-voltage interlock fault handling strategy corresponding to the motor is determined to include controlling the entire vehicle not to reduce high voltage, turning off each switch tube of the three-phase bridge arm of the air-conditioning controller, limiting the power of the air-conditioning controller to a first preset value, controlling the instrument to light up a system fault indicator light of a first target color, and controlling the display module to issue a first text reminder; if the high-voltage interlock fault position is the phase corresponding to the second voltage-dividing resistor, the high-voltage interlock fault handling strategy corresponding to the target is determined to include controlling the entire vehicle not to reduce high voltage, turning off each switch tube of the heating controller, limiting the power of the heating controller to a second preset value, controlling the instrument to light up a system fault indicator light of a second target color, and controlling the display module to issue a second text reminder.

[0013] According to a second aspect of the present invention, the present invention provides a high-voltage interlock fault detection device, which is applied to an air-conditioning control system, the air-conditioning control system includes an air-conditioning controller and an air-conditioning compressor motor, the midpoint of each phase bridge arm in the three-phase bridge arm of the air-conditioning controller is respectively connected to different phases of the air-conditioning compressor motor, and each phase bridge arm includes an upper bridge arm switch tube and a lower bridge arm switch tube; and the device includes: a switch tube control module, which is used to control each bridge arm switch tube in the first switch tube combination for detecting high-voltage interlock faults in the three-phase bridge arm of the air-conditioning controller to be turned on, so that the first voltage of the first voltage-dividing resistor for detecting high-voltage interlock faults is generated at both ends of each first voltage-dividing resistor; wherein each first voltage-dividing resistor is respectively connected to different bridge arm switch tubes in the first switch tube combination; a fault determination module, which is used to determine whether a high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor according to the comparison result of the first voltage of the first voltage-dividing resistor for detecting high-voltage interlock faults and the voltage threshold for each first voltage-dividing resistor, and the motor phase corresponding to the first voltage-dividing resistor is one phase of the air-conditioning compressor motor.

[0014] In a third aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor are communicatively connected to each other, computer instructions are stored in the memory, and the processor executes the high-voltage interlock fault detection method of the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0015] In a fourth aspect, the present invention provides a vehicle, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the high-voltage interlock fault detection method of the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0016] In a fifth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the method for detecting a high-voltage interlock fault according to the first aspect or any corresponding embodiment thereof.

[0017] In a sixth aspect, the present invention provides a computer program product, comprising computer instructions for causing a computer to execute the method for detecting a high-voltage interlock fault according to the first aspect or any corresponding embodiment thereof.

[0018] The present invention controls each bridge arm switch tube in the first switch tube combination for detecting high-voltage interlock faults in the three-phase bridge arm of the air-conditioning controller to be turned on, and then collects the first voltage for detecting the high-voltage interlock fault at both ends of each first voltage-dividing resistor, compares the first voltage for detecting the high-voltage interlock fault at both ends of each first voltage-dividing resistor with the voltage threshold, determines the comparison result corresponding to each first voltage-dividing resistor, and can accurately determine whether the motor phase corresponding to each first voltage-dividing resistor has a high-voltage interlock fault based on the comparison result corresponding to each first voltage-dividing resistor.

[0019] Compared with the related art, the present application adopts the circuit of the air-conditioning control system itself, and determines whether there is a high-voltage interlock fault in the motor phase corresponding to each first voltage-dividing resistor by adding a voltage-dividing resistor, without adding a low-voltage interlock detection terminal for detecting the high-voltage interlock signal, thereby avoiding the problems of the low-voltage interlock detection terminal for detecting the high-voltage interlock signal being corroded, oxidized, deformed, or pin-retracted after long-term operation, or the vehicle driving under harsh working conditions causing large vibrations that cause the high-voltage interlock signal to be momentarily disconnected, causing the whole vehicle to falsely report a high-voltage interlock fault. In addition, the system cost is reduced without adding a low-voltage circuit.

[0020] In addition, since the low-voltage circuit determines whether the high-voltage system is abnormal by monitoring the on-off status of high-voltage connectors, wires and other components, it is impossible to accurately determine the specific components, resulting in the inability to determine the specific location of the interlock fault. The present invention can accurately locate whether each first voltage-dividing resistor has a high-voltage interlock fault based on the comparison result of the voltage of each first voltage-dividing resistor, thereby accurately determining the specific location of the high-voltage interlock fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a schematic diagram of a module of an air conditioning control system provided according to an embodiment of the present invention; Figure 2 is a flow chart of a method for detecting a high-voltage interlock fault according to an embodiment of the present invention; Figure 3 is a module schematic diagram of another air conditioning control system provided according to an embodiment of the present invention; Figure 4 is a module schematic diagram of another air conditioning control system provided according to an embodiment of the present invention; Figure 5 is a module schematic diagram of another air conditioning control system provided according to an embodiment of the present invention; Figure 6 is a module schematic diagram of another air conditioning control system provided according to an embodiment of the present invention; Figure 7 is a timing diagram of switch conduction for detecting a high-voltage interlock fault provided in accordance with an embodiment of the present invention; Figure 8 is a flow chart of another high-voltage interlock fault detection method provided according to an embodiment of the present invention; Fig. 9 It is a schematic diagram of the hardware structure of a computer device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0024] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0025] Please refer to Figure 1 , Figure 1 : is a module schematic diagram of an air conditioning control system provided according to an embodiment of the present invention. The air conditioning control system includes an air conditioning compressor 2 (Air Conditioning Compressor, ACP), a heating resistor 3, an air conditioning control module 1 and a high-voltage power battery 4. Among them, the air conditioning control module 1 can be used to independently integrate the functional circuits of the air conditioning compressor 2 and the heating resistor 3 to achieve the purpose of controlling the air conditioning control system.

[0026] The air conditioning control module 1 may include an air conditioning controller 11, a heating controller 12, an ACP power distribution connector 13, a positive temperature coefficient thermistor (PTC) power distribution connector (ie, a PTC power distribution connector 14), a bus capacitor 15, and a bus IPT interface 16. The positive and negative electrodes of the bus IPT interface 16 are respectively connected to the high-voltage power battery 4. The air conditioning compressor 2 may include an air conditioning motor 21 and an air conditioning compressor connector 22. The air conditioning motor 21 is a three-phase motor, and the U phase, V phase, and W phase of the air conditioning motor 21 may be connected to the air conditioning compressor connector 22.

[0027] The upper end of the three-phase bridge arm of the air-conditioning controller 11 can be connected to the positive pole of the DC bus, the lower end of the three-phase bridge arm of the air-conditioning controller 11 can be connected to the negative pole of the DC bus, and the midpoints of the three-phase bridge arms of the air-conditioning controller 11 are respectively connected to the ACP power distribution connector 13, so that the midpoint of each phase bridge arm in the three-phase bridge arm of the air-conditioning controller 11 is respectively connected to different phases of the air-conditioning compressor 2, that is, the U phase in the three-phase bridge arm is connected to the U phase of the air-conditioning motor 21, the V phase in the three-phase bridge arm is connected to the V phase of the air-conditioning motor 21, and the W phase in the three-phase bridge arm is connected to the W phase of the air-conditioning motor 21.

[0028] The air conditioning controller 11 may include a plurality of bridge arm switch tubes, and the plurality of bridge arm switch tubes may be switch tube G1, switch tube G2, switch tube G3, switch tube G4, switch tube G5, and switch tube G6, respectively. Among them, switch tube G1 and switch tube G4 may constitute the first bridge arm of the air conditioning controller 11, switch tube G2 and switch tube G5 may constitute the second bridge arm of the air conditioning controller 11, and switch tube G3 and switch tube G6 may constitute the third bridge arm of the air conditioning controller 11. Among them, the switch tube may be a field effect tube, or may be other types of power electronic power components, which are not specifically limited here.

[0029] It should be noted that the switch tube connected to the positive pole of the DC bus can be used as the upper bridge arm switch tube, and the switch tube connected to the negative pole of the DC bus can be used as the lower bridge arm switch tube.

[0030] The air conditioning controller 11 may also include a voltage-dividing resistor. Among them, for the air conditioning controller 11, the voltage-dividing resistor used to detect the high-voltage interlock fault may include a voltage-dividing resistor R1 and a voltage-dividing resistor R2, and the corresponding sampling voltage may include a sampling voltage U1 and a sampling voltage U2, wherein the sampling voltage U1 is obtained by sampling the voltage across the voltage-dividing resistor R1, and the sampling voltage U2 is obtained by sampling the voltage across the voltage-dividing resistor R2. The voltage-dividing resistor R1 and the voltage-dividing resistor R2 may be respectively connected to the switch tube of the air conditioning controller 11, and the switch tubes connected to the voltage-dividing resistor R1 and the voltage-dividing resistor R2 may not belong to the same bridge arm, for example: the voltage-dividing resistor R1 is connected to the switch tube G1, and the voltage-dividing resistor R2 cannot be connected to the switch tube G4. In this embodiment, one end of the voltage-dividing resistor R1 can be connected to the switch tube G4, and the other end is connected to the negative pole of the DC bus; one end of the voltage-dividing resistor R2 is connected to the switch tube G5, and the other end is connected to the negative pole of the DC bus.

[0031] As an example, one end of the voltage-dividing resistor R1 can be connected to the switch tube G1, and the other end can be connected to the positive pole of the DC bus; one end of the voltage-dividing resistor R2 can be connected to the switch tube G2, and the other end can be connected to the positive pole of the DC bus.

[0032] As an example, one end of the voltage-dividing resistor R1 can be connected to the switch tube G1, and the other end can be connected to the positive electrode of the DC bus; one end of the voltage-dividing resistor R2 is connected to the switch tube G5, and the other end is connected to the negative electrode of the DC bus.

[0033] The heating resistor 3 includes a heating resistor 311 and a heating resistor connector 312. One end of the heating resistor 311 is connected to the heating resistor connector 312, and the other end is connected to the positive pole of the DC bus; one end of the heating resistor connector 312 is connected to the PTC power distribution connector 14, and the other end of the heating resistor connector 312 is connected to the heating resistor 311. The input end of the heating controller 12 can be connected to the positive and negative poles of the DC bus, and the output end of the heating controller 12 can be connected to the PTC power distribution connector 14. One end of the PTC power distribution connector 14 is connected to the heating controller 12, and the other end of the PTC power distribution connector 14 is connected to the heating resistor connector 312.

[0034] The heating controller 12 includes a switch tube G7 and a switch tube G8, a voltage-dividing resistor R3 and a voltage-dividing resistor R4, wherein the voltage-dividing resistor R3 and the voltage-dividing resistor R4 can be connected to different phases of the heating resistor 3.

[0035] In this embodiment, one end of the switch tube G7 is connected to the PTC power distribution connector 14, and the other end is connected to the voltage divider resistor R3. One end of the voltage divider resistor R3 is connected to the switch tube G7, and the other end is connected to the negative electrode of the DC bus. The sampling voltage U3 is obtained by sampling the voltage on both sides of the voltage divider resistor R3. One end of the switch tube G8 is connected to the PTC power distribution connector 14, and the other end is connected to the voltage divider resistor R4. One end of the voltage divider resistor R4 is connected to the switch tube G4, and the other end is connected to the negative electrode of the DC bus. The sampling voltage U4 is obtained by sampling the voltage on both sides of the voltage divider resistor R4.

[0036] As an example, one end of the voltage-dividing resistor R3 is connected to the switch tube G7, and the other end is connected to the PTC power distribution connector 14; one end of the voltage-dividing resistor R4 is connected to the switch tube G8, and the other end is connected to the negative pole of the DC bus.

[0037] According to an embodiment of the present invention, an embodiment of a method for detecting a high-voltage interlock fault is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0038] In this embodiment, a high voltage interlock fault detection method is provided, which can be used in the above-mentioned air conditioning control system, etc. Figure 2 FIG. 1 is a flow chart of a method for detecting a high voltage interlock fault according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps: Step S201, control each bridge arm switch tube in the first switch tube combination for detecting high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller to be turned on, so that the first voltage of the first voltage-dividing resistor for detecting high-voltage interlock fault is generated at both ends of each first voltage-dividing resistor; wherein each first voltage-dividing resistor is respectively connected to different bridge arm switch tubes in the first switch tube combination.

[0039] The first switch tube combination can indicate the switch tubes used to detect high-voltage interlock faults among all bridge arm switch tubes. Among them, the number of switch tubes can be 2, 3, etc., which is not specifically limited here. The first voltage-dividing resistor can indicate the voltage-dividing resistor used to detect high-voltage interlock faults. After determining the first switch tube combination, each bridge arm switch tube in the first switch tube combination is closed, so that each bridge arm switch tube in the first switch tube combination is turned on, so that the current generated by the high-voltage power battery can pass through each bridge arm switch tube in the first switch tube combination and flow to the first voltage-dividing resistor. Then determine the first voltage of the first voltage-dividing resistor for detecting high-voltage interlock faults generated at both ends of each first voltage-dividing resistor.

[0040] As an example, see Figure 1 , the number of bridge arm switch tubes in the first switch tube combination can be 3, and the switch tube G3, switch tube G4 and switch tube G5 can be selected as the first switch tube combination. Among them, when the switch tubes G3, G4 and G5 are controlled to be closed, the high-voltage power battery can generate current, wherein the current can flow through the positive electrode of the high-voltage power battery, the switch tube G3, the switch tube G4, the switch tube G5, the voltage-dividing resistor R1 and the voltage-dividing resistor R2. When the current flows through the voltage-dividing resistor R1, the voltage-dividing resistor R1 can generate a voltage for detecting a high-voltage interlocking fault; when the current flows through the voltage-dividing resistor R2, the voltage-dividing resistor R2 can generate a voltage for detecting a high-voltage interlocking fault. If only one phase of the V phase or the W phase fails, it can be determined that there is a problem with the circuit of the phase where the fault occurs. For example, if there is a fault in the V phase, it can be determined that there is a problem with the circuit of the V phase.

[0041] As an example, the number of switch tubes in the first switch tube can be 2, and the switch tube G3 and the switch tube G5 can be selected as the first switch tube combination. The current can flow through the positive electrode of the high-voltage power battery, the switch tube G3, the switch tube G5, and the voltage divider resistor R2. When the current flows through the voltage divider resistor R2, the voltage divider resistor R2 can generate a voltage for detecting a high-voltage interlock fault. If the voltage of the voltage divider resistor R2 is less than the voltage threshold, the characterization circuit is incomplete, and it can be determined that a high-voltage interlock fault occurs in the V phase.

[0042] Please refer to Figure 3 , Figure 3 is a module schematic diagram of another air-conditioning control system provided according to an embodiment of the present invention.

[0043] Combination Figure 3 As shown, the bridge arm switch tubes in the first switch tube combination can be selected from switch tube G3, switch tube G4 and switch tube G5. The current flow direction of the circuit of the air conditioner compressor is as follows: Figure 3 As shown by the dotted arrow in the middle. The current flows out from the positive electrode of the high-voltage power battery, passes through the switch tube G1 of the air-conditioning controller, flows through the ACP power distribution connector, the air-conditioning compressor connector and the U phase of the air-conditioning motor, and then flows through the U phase and V phase of the air-conditioning motor respectively, and then flows through the switch tube G4 and the voltage-dividing resistor R1 of the air-conditioning controller, the switch tube G5 and the voltage-dividing resistor R2 of the air-conditioning controller respectively, and finally flows to the negative electrode of the high-voltage power battery. If the circuit connection is complete in this process, current flows through the voltage-dividing resistor R1 and the voltage-dividing resistor R2. The voltage across the voltage-dividing resistor R1 can be obtained by sampling the voltage U1; the voltage across the voltage-dividing resistor R2 can be obtained by sampling the voltage U2.

[0044] Please refer to Figure 4 , Figure 4 is a module schematic diagram of another air-conditioning control system provided according to an embodiment of the present invention.

[0045] Combination Figure 4 As shown, the bridge arm switch tubes in the first switch tube combination can be selected from switch tube G2, switch tube G3 and switch tube G4. The current flow direction of the circuit of the air conditioner compressor is as follows: Figure 4 As shown by the dotted arrow in the middle. The current flows out from the positive electrode of the high-voltage power battery, flows through the switch tube G2 and the voltage-dividing resistor R1 of the air-conditioning controller, the switch tube G3 and the voltage-dividing resistor R2 of the air-conditioning controller, flows through the ACP power distribution connector, the air-conditioning compressor connector, and the U phase and V phase of the air-conditioning motor, and then flows through the W phase of the air-conditioning motor, flows through the switch tube G4 of the air-conditioning controller, and finally flows to the negative electrode of the high-voltage power battery. If the circuit connection is complete in this process, current flows through the voltage-dividing resistor R1 and the voltage-dividing resistor R2. The voltage across the voltage-dividing resistor R1 can be obtained by sampling the voltage U1; the voltage across the voltage-dividing resistor R2 can be obtained by sampling the voltage U2.

[0046] Step S202, for each first voltage-dividing resistor, determine whether a high-voltage interlocking fault occurs in the motor phase corresponding to the first voltage-dividing resistor based on a comparison result between the first voltage of the first voltage-dividing resistor for detecting a high-voltage interlocking fault and a voltage threshold, wherein the motor phase corresponding to the first voltage-dividing resistor is a phase of the air-conditioning compressor motor.

[0047] High-voltage interlocking is a safety mechanism. Once loop integrity abnormalities are detected, such as a loose or disconnected high-voltage loop, the high-voltage relay can be cut off to avoid leakage, arcing, and high-voltage electric shock injuries, thereby ensuring the safety of personnel and vehicles. High-voltage interlocking failures can be caused by vibration, improper installation, or loose connectors due to long-term use. In this embodiment, the comparison result of the voltage of the first voltage-dividing resistor and the voltage threshold can be used to determine whether the motor phase corresponding to the first voltage-dividing resistor has a high-voltage interlocking failure.

[0048] The voltage threshold can indicate the critical point at which a high-voltage interlock fault occurs. The voltage threshold can be U5 or U6, etc., which is not specifically limited here. For each first voltage-dividing resistor, such as voltage-dividing resistor R1, voltage-dividing resistor R2, etc., the voltage of each first voltage-dividing resistor can be detected according to the sampled voltage, and then the voltage of each first voltage-dividing resistor is compared with the voltage threshold to obtain the comparison result of each first voltage-dividing resistor, and then the motor phase corresponding to each first voltage-dividing resistor is judged according to the comparison result of each first voltage-dividing resistor whether a high-voltage interlock fault occurs.

[0049] The detection method of high-voltage interlock fault provided in this embodiment is to control each bridge arm switch tube in the first switch tube combination used to detect high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller to be turned on, and then collect the first voltage used to detect the high-voltage interlock fault at both ends of each first voltage-dividing resistor, and compare the first voltage used to detect the high-voltage interlock fault at both ends of each first voltage-dividing resistor with the voltage threshold, determine the comparison result corresponding to each first voltage-dividing resistor, and accurately determine whether the motor phase corresponding to each first voltage-dividing resistor has a high-voltage interlock fault according to the comparison result corresponding to each first voltage-dividing resistor. Compared with the related art, since the low-voltage circuit determines whether the high-voltage system is abnormal by monitoring the on-off status of components such as high-voltage connectors and wires, it is impossible to accurately determine the specific components, resulting in the inability to determine the specific location of the interlock fault. The present invention can accurately locate whether each first voltage-dividing resistor has a high-voltage interlock fault based on the comparison result of the voltage of each first voltage-dividing resistor, thereby accurately determining the specific location of the high-voltage interlock fault.

[0050] In a possible implementation, step S202 includes: when a first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault is less than a voltage threshold, determining that a high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor.

[0051] As can be seen from the above, the voltage threshold can indicate the critical point of the occurrence of a high-voltage interlock fault. Among them, when the first voltage of the first voltage-dividing resistor used to detect the high-voltage interlock fault is less than the voltage threshold, it is determined that a high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor. When the first voltage of the first voltage-dividing resistor used to detect the high-voltage interlock fault is not less than the voltage threshold, it is determined that the motor phase corresponding to the first voltage-dividing resistor does not have a high-voltage interlock fault.

[0052] The high-voltage interlock fault detection method provided in this embodiment can quickly and accurately determine that a high-voltage interlock fault may exist in the motor phase corresponding to the voltage-dividing resistor when the voltage of the voltage-dividing resistor is lower than the voltage threshold by setting a voltage threshold.

[0053] In a possible implementation, the above step S202 includes: Step S2021, when the first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault is less than a voltage threshold, each bridge arm switch tube in the first switch tube combination for detecting a high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller is controlled to be turned on again, so that the second voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault is generated at both ends of each first voltage-dividing resistor.

[0054] In this embodiment, when the first voltage of the first voltage-dividing resistor used to detect a high-voltage interlock fault is less than the voltage threshold, it is not directly determined that a high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor. It is necessary to control each bridge arm switch tube in the first switch tube combination used to detect a high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller again to turn on, and determine that the second voltage of the first voltage-dividing resistor used to detect a high-voltage interlock fault is generated at both ends of each first voltage-dividing resistor.

[0055] For example: when the first voltage of the voltage-dividing resistor R1 used to detect a high-voltage interlock fault is less than a voltage threshold, each bridge arm switch tube in the first switch tube combination used to detect a high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller is controlled to turn on again, and the second voltage of the voltage-dividing resistor R1 used to detect a high-voltage interlock fault is determined again.

[0056] Another example: when the first voltage of the voltage-dividing resistor R2 used to detect the high-voltage interlock fault is less than the voltage threshold, each bridge arm switch tube in the first switch tube combination used to detect the high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller is controlled to be turned on again, and the second voltage of the voltage-dividing resistor R2 used to detect the high-voltage interlock fault is determined again.

[0057] Step S2022, when the first voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault and the second voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault are both less than the voltage threshold, it is determined that a high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor.

[0058] When the second voltage is also less than the voltage threshold, it is determined that a high voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor.

[0059] In a possible implementation, the first detection of whether the first voltage is less than the voltage threshold can be used as the first condition, and the second detection of whether the second voltage is less than the voltage threshold can be used as the second condition. When the first detection of the first voltage is less than the voltage threshold, the second condition can be executed, and when the second condition is that the second voltage is less than the voltage threshold, it is determined that the motor phase corresponding to the first voltage-dividing resistor has a high-voltage interlock fault. When the first detection of the first voltage is greater than the voltage threshold, the second condition does not need to be executed.

[0060] Step S2023, when the first voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault is less than the voltage threshold and the second voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault is not less than the voltage threshold, it is determined that the motor phase corresponding to the first voltage-dividing resistor does not have a high-voltage interlock fault.

[0061] As can be seen from the above, when the first voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault is less than the voltage threshold, it is necessary to control each bridge arm switch tube in the first switch tube combination for detecting the high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller to be turned on again, and determine that the second voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault is generated at both ends of each first voltage-dividing resistor. If the second voltage is not less than the voltage threshold, the circuit may have a voltage deviation due to other factors in the first detection, so it is determined that the motor phase corresponding to the first voltage-dividing resistor does not have a high-voltage interlock fault.

[0062] The method for detecting a high-voltage interlock fault provided in the present embodiment controls the first switch tube combination for detecting a high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller twice, and measures the first voltage and the second voltage respectively. Only when the first voltage and the second voltage obtained by measuring the same voltage-dividing resistor twice are both less than the voltage threshold, it is determined that the motor phase corresponding to the voltage-dividing resistor has no high-voltage interlock fault, thereby reducing the possibility of false alarm or missed alarm due to a single measurement error or interference, and improving the accuracy of determining a high-voltage interlock fault.

[0063] In a possible implementation, in the above step S201, each bridge arm switch tube in the first switch tube combination for detecting a high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller is turned on, including: Step S2011, at a first moment, controlling the arm switch tubes in the first switch tube combination that are not connected to the first voltage-dividing resistor to be turned on.

[0064] Step S2012, at the second moment, controlling the bridge arm switch tube connected to the first voltage-dividing resistor in the first switch tube combination to be turned on.

[0065] The first moment may represent the moment when the bridge arm switch tube not connected to the first voltage-dividing resistor is turned on. For example, the bridge arm switch tube not connected to the first voltage-dividing resistor is closed at T1.

[0066] The second moment may represent the moment of turning on the bridge arm switch connected to the first voltage-dividing resistor. For example, the bridge arm switch connected to the first voltage-dividing resistor is turned on at T2.

[0067] As an example, see Figure 1 , the bridge arm switch tube in the first switch tube combination that is not connected to the first voltage-dividing resistor may be the switch tube G3, and the bridge arm switch tube in the first switch tube combination that is connected to the first voltage-dividing resistor may be the switch tube G4 and the switch tube G5. Among them, the first moment may be less than the second moment, that is, the switch tube G3 may be turned on first, and then the switch tube G4 and the switch tube G5 may be turned on.

[0068] The high-voltage interlock fault detection method provided in this embodiment can obtain voltage information in two states by controlling the bridge arm switch tube not connected to the first voltage-dividing resistor and the bridge arm switch tube connected to the first voltage-dividing resistor in the first switch tube combination to be turned on at different times. This time-sharing control method helps to reduce the interference caused by operating multiple switch tubes at the same time, thereby improving the accuracy of detection.

[0069] In a possible implementation, the air conditioning control system further includes a heating controller and a heating resistor; wherein the method further includes: Step S301, control each switch tube in the second switch tube combination for detecting high-voltage interlock fault of the heating controller to be turned on, so that a third voltage for detecting high-voltage interlock fault is generated at both ends of each second voltage-dividing resistor, wherein each second voltage-dividing resistor is respectively connected to different switch tubes in the second switch tube combination.

[0070] The second switch tube combination can indicate the switch tube used to detect the high-voltage interlock fault in the switch tube of the heating resistor. The number of switch tubes in the second switch tube combination can be 1 or 2, etc., which is not specifically limited here. By turning on the switch tubes in the second switch tube combination, the third voltage for detecting the high-voltage interlock fault is generated at both ends of each second voltage-dividing resistor.

[0071] Please refer to Figure 5 , Figure 5 is a module diagram of another air-conditioning control system provided according to an embodiment of the present invention.

[0072] Combination Figure 5As shown, when the number of the second switch tube combination is two, the second switch tube combination may include switch tube G7 and switch tube G8. Among them, one end of switch tube G7 can be connected to the PTC power distribution connector, and the other end can be connected to the voltage divider resistor R3. One end of the voltage divider resistor R3 is connected to switch tube G7, and the other end is connected to the negative pole of the DC bus. The sampling voltage U3 is obtained by sampling the voltage on both sides of the voltage divider resistor R3. One end of switch tube G8 is connected to the PTC power distribution connector, and the other end is connected to the voltage divider resistor R4. One end of the voltage divider resistor R4 is connected to switch tube G4, and the other end is connected to the negative pole of the DC bus. The sampling voltage U4 is obtained by sampling the voltage on both sides of the voltage divider resistor R4. The flow direction of the current in the heating resistor circuit is as shown in Figure 5 As shown by the dotted arrow in the middle. When the switch tube G7 and the switch tube G8 are turned on, the current flows out from the positive electrode of the high-voltage power battery, passes through the PTC power distribution connector, the heating resistor connector and one end of the heating resistor, and flows through the switch tube G7 and the voltage divider resistor R3 of the heating controller, the switch tube G8 and the voltage divider resistor R4 of the heating controller, and finally flows to the negative electrode of the high-voltage power battery. In this process, if the circuit connection is complete, current flows through the voltage divider resistor R3 and the voltage divider resistor R4, so the sampling voltage U3 and the sampling voltage U4 can be detected.

[0073] Please refer to Figure 6 , Figure 6 is a module diagram of another air-conditioning control system provided according to an embodiment of the present invention.

[0074] Combination Figure 6 As shown, when the number of switch tubes in the second switch tube combination is 1, the second switch tube combination includes switch tube G7. Among them, one end of switch tube G7 is connected to the PTC power distribution connector, and the other end is connected to the voltage divider resistor R3. One end of the voltage divider resistor R3 is connected to switch tube G7, and the other end is connected to the negative electrode of the DC bus. The sampling voltage U3 is obtained by sampling the voltage on both sides of the voltage divider resistor R3. The flow direction of the current in the heating resistor circuit is as follows Figure 6 As shown by the dotted arrow in the middle. When the switch tube G7 is turned on, the current flows out from the positive electrode of the high-voltage power battery, passes through the PTC power distribution connector, the heating resistor connector and one end of the heating resistor, flows through the switch tube G7 of the heating controller and the voltage divider resistor R3, and finally flows to the negative electrode of the high-voltage power battery. In this process, if the circuit connection is complete, there is current flowing through the voltage divider resistor R3, so the sampling voltage U3 can be detected.

[0075] Step S302, for each second voltage-dividing resistor, determine whether a high-voltage interlocking fault occurs in the phase corresponding to the second voltage-dividing resistor based on the comparison result between the third voltage of the second voltage-dividing resistor for detecting the high-voltage interlocking fault and the voltage threshold, wherein the phase corresponding to the second voltage-dividing resistor is a phase of the heating resistor.

[0076] Step S303: when the third voltage of the second voltage-dividing resistor for detecting the high-voltage interlock fault is less than the voltage threshold, it is determined that a high-voltage interlock fault occurs in the phase corresponding to the second voltage-dividing resistor.

[0077] The phase corresponding to the second voltage-dividing resistor may be one phase of the heating resistor, that is, the heating resistor may be a three-phase heating resistor.

[0078] For each second voltage-dividing resistor, the corresponding voltage can be collected, and then the voltage of each second voltage-dividing resistor is compared with the voltage threshold to obtain a comparison result. According to the comparison result, it can be accurately determined whether the phase corresponding to the second voltage-dividing resistor has a high-voltage interlocking fault. When the third voltage of the second voltage-dividing resistor used to detect the high-voltage interlocking fault is less than the voltage threshold, it is determined that the phase corresponding to the second voltage-dividing resistor has a high-voltage interlocking fault; when the third voltage of the second voltage-dividing resistor used to detect the high-voltage interlocking fault is not less than the voltage threshold, it is determined that the phase corresponding to the second voltage-dividing resistor has not a high-voltage interlocking fault.

[0079] In a possible implementation, multiplexing detection can also be used for the heating resistor, that is, when the third voltage of the second voltage-dividing resistor for detecting the high-voltage interlock fault is less than the voltage threshold, the second switch tube combination of the heating controller for detecting the high-voltage interlock fault is controlled to be turned on again, so that the two ends of each second voltage-dividing resistor generate a fourth voltage for detecting the high-voltage interlock fault. Then, when the third voltage of the second voltage-dividing resistor for detecting the high-voltage interlock fault and the fourth voltage of the second voltage-dividing resistor for detecting the high-voltage interlock fault are both less than the voltage threshold, it is determined that the phase corresponding to the second voltage-dividing resistor has a high-voltage interlock fault.

[0080] In one possible implementation, the second switch tube combination includes at least two switch tubes, wherein each switch tube in the second switch tube combination for controlling the heating controller for detecting the high-voltage interlock fault in the above step S301 is turned on, including: controlling at least two switch tubes for detecting the high-voltage interlock fault of the heating controller to be turned on at the second moment.

[0081] The at least two switch tubes of the heating controller for detecting high-voltage interlock faults and the bridge arm switch tube of the air-conditioning compressor motor for detecting high-voltage interlock faults connected to the first voltage-dividing resistor have the same turn-on time, both of which are the second time. When the current time reaches the second time, the at least two switch tubes of the heating controller for detecting high-voltage interlock faults are controlled to be turned on.

[0082] Please refer to Figure 7 , Figure 7 It is a timing diagram of switch tube conduction for detecting high-voltage interlock fault provided according to an embodiment of the present invention.

[0083] When the vehicle is on high voltage at t0, the air conditioning controller controls the switch tube G3 of the upper bridge arm of the U phase to turn on at t1, and controls the switch tube G4 of the lower bridge arm of the W phase and the switch tube G5 of the lower bridge arm of the V phase to turn on at t2. Synchronously, at t2, the heating controller controls the switch tube G7 and the switch tube G8 to turn on, and controls the remaining switch tubes to remain in the disconnected state. At t2-t3, the sampled voltage U1 on both sides of the voltage divider resistor R1 of the W phase and the sampled voltage U2 on both sides of the voltage divider resistor R2 of the V phase are collected, and all the switch tubes are disconnected at t3.

[0084] During the process from t2 to t3, the current flows out from the positive electrode of the high-voltage power battery, passes through the switch tube G1 of the air-conditioning controller, flows through the ACP power distribution connector, the air-conditioning compressor connector and the U phase of the air-conditioning motor, and then flows through the U phase and V phase of the air-conditioning motor respectively, and then flows through the switch tube G4 and the voltage-dividing resistor R1 of the air-conditioning controller, the switch tube G5 and the voltage-dividing resistor R2 of the air-conditioning controller, and finally flows to the negative electrode of the high-voltage power battery.

[0085] During the process of t2~t3, the current flows out from the positive electrode of the high-voltage power battery, passes through the PTC power distribution connector, the heating resistor connector and one end of the heating resistor, and then flows through the two heating resistors of the heating resistor, respectively, and then flows through the switch tube G7 and the voltage divider resistor R3 of the heating controller, the switch tube G8 and the voltage divider resistor R4 of the heating controller, and finally flows to the negative electrode of the high-voltage power battery. In this process, if the circuit connection is complete, current flows through the voltage divider resistor R3 and the voltage divider resistor R4, so it can be detected that the values ​​of the sampling voltage U3 and the sampling voltage U4 are not less than the voltage threshold.

[0086] At times t3 to t6, the on / off states of all switch tubes are repeatedly tested according to the timing sequence of times t0 to t3 to ensure the accuracy of the test results and reduce the probability of false alarms of high-voltage interlock faults.

[0087] More specifically, if the values ​​of the sampled voltage U1 and the sampled voltage U2 are not less than the voltage threshold, it is determined that the ACP power distribution connector and the air conditioning compressor connector are fully connected; if the sampled voltage U1 is detected twice to be less than the voltage threshold or the sampled voltage U2 is less than the set threshold, it is determined that there is a high-voltage interlock fault in the W phase or V phase circuit of the air conditioning compressor, and the high-voltage interlock circuit is fault-located according to the detection results. After the detection is completed, all switch tubes are disconnected.

[0088] Similarly, if the values ​​of the sampled voltage U3 and the sampled voltage U4 are detected to be greater than or equal to the voltage threshold, it is determined that the PTC power distribution connector and the heating resistor connector are connected completely; if the sampled voltage U3 is detected twice to be less than the voltage threshold or the sampled voltage U4 is detected to be less than the voltage threshold, it is determined that there is a high-voltage interlock fault in the heating resistor circuit, and the high-voltage interlock circuit is fault-located according to the detection results. After the detection is completed, all switch tubes are disconnected.

[0089] The high-voltage interlock fault detection method provided in the present embodiment controls each switch tube in the second switch tube combination for detecting the high-voltage interlock fault of the heating controller to be turned on, and then collects the third voltage for detecting the high-voltage interlock fault at both ends of each second voltage-dividing resistor, compares the third voltage for detecting the high-voltage interlock fault at both ends of each second voltage-dividing resistor with the voltage threshold, determines the comparison result corresponding to each first voltage-dividing resistor, and according to the comparison result corresponding to each first voltage-dividing resistor, can accurately determine whether the motor phase corresponding to each first voltage-dividing resistor has a high-voltage interlock fault.

[0090] In a possible implementation, in order to accurately handle a high voltage interlock fault, the method further includes: Step S401, when a high-voltage interlock fault occurs in a target phase, a specific high-voltage interlock fault position is obtained; wherein the target phase includes a motor phase corresponding to the first voltage-dividing resistor and / or a phase corresponding to the second voltage-dividing resistor.

[0091] The target phase may include the motor phase corresponding to the first voltage-dividing resistor and / or the phase corresponding to the second voltage-dividing resistor. The occurrence of a high-voltage interlock fault in the target phase may indicate that a high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor, a high-voltage interlock fault occurs in the phase corresponding to the second voltage-dividing resistor, or both the motor phase corresponding to the first voltage-dividing resistor and the phase corresponding to the second voltage-dividing resistor fail.

[0092] In a specific implementation, when a high-voltage interlock fault occurs in a target phase, the location of the high-voltage interlock fault can be determined according to an AC circuit and a PTC circuit in the air-conditioning control system.

[0093] Step S402: determining a high voltage interlock fault processing strategy corresponding to the high voltage interlock fault position based on the high voltage interlock fault position.

[0094] Specifically, the above step S402 includes: Step S4021, if the high-voltage interlock fault position is the motor phase corresponding to the first voltage-dividing resistor, determine the high-voltage interlock fault handling strategy corresponding to the motor, including controlling the entire vehicle not to reduce high voltage, turning off each switch tube of the three-phase bridge arm of the air-conditioning controller, limiting the power of the air-conditioning controller to a first preset value, controlling the instrument to light up the first target color system fault indicator light, and controlling the display module to issue a first text reminder.

[0095] The first preset value may represent the power value of the air conditioning controller. The first preset value may be zero or other values, which are not specifically limited here. The first target color may be yellow, blue, etc., which are not specifically limited here. The display module may be the central control screen of the target vehicle, or other equipment for displaying text in the target vehicle, which are not specifically limited here.

[0096] During specific implementation, if the high-voltage interlock fault position is the motor phase corresponding to the first voltage-dividing resistor, it is necessary to control the entire vehicle not to reduce high voltage, turn off each switch tube of the three-phase bridge arm of the air-conditioning controller, limit the power of the air-conditioning controller to the first preset value, control the instrument to light up the first target color system fault indicator light, and control the display module to give a first text reminder.

[0097] For example: if the motor phase corresponding to the first voltage-dividing resistor has a high-voltage interlock fault, the vehicle is controlled not to reduce the high voltage, each switch tube of the three-phase bridge arm of the air-conditioning controller is turned off, the power of the air-conditioning controller is limited to the first preset value of zero, the control instrument lights up the yellow system fault indicator, and the control display module issues the first text reminder. For example: "High-voltage interlock fault, please go to the 4S store for repair."

[0098] Step S4022, if the high-voltage interlock fault position is the phase corresponding to the second voltage-dividing resistor, determine the high-voltage interlock fault handling strategy corresponding to the target, including controlling the entire vehicle not to reduce high voltage, turning off each switch tube of the heating controller, limiting the power of the heating controller to a second preset value, controlling the instrument to light up the second target color system fault indicator light, and controlling the display module to issue a second text reminder.

[0099] The second preset value may represent the power value of the heating resistor. The second preset value may be zero or other values, which are not specifically limited here. The second target color may be yellow, blue, etc., which are not specifically limited here. The display module may be a central control screen of the target vehicle, or other equipment for displaying text in the target vehicle, which are not specifically limited here.

[0100] In specific implementation, if the high-voltage interlock fault position is the phase corresponding to the second voltage-dividing resistor, it is necessary to control the vehicle not to reduce the high voltage, turn off each switch tube of the heating controller, limit the power of the air-conditioning controller to the second preset value, control the instrument to light up the second target color system fault indicator light, and control the display module to give a second text reminder. For example: "High-voltage interlock fault, please go to the 4S store for repair."

[0101] The detection method of high-voltage interlock fault provided in this embodiment is different from the traditional solution that requires the whole vehicle to be powered off according to the vehicle usage scenario when a high-voltage interlock fault occurs, and even the vehicle cannot be powered on after being powered off. In this embodiment, when an interlock fault occurs, it will not affect the high voltage on and off and driving of the whole vehicle. Only by closing the switch tube, it is ensured that the connector port is not energized. Under the premise of ensuring the safety of personnel, it does not affect the driving of the whole vehicle, which greatly improves the driving experience after the fault occurs.

[0102] In a possible implementation, the method further includes: Step S501: based on the vehicle state of the target vehicle, determine a high-voltage interlock fault handling strategy corresponding to the vehicle state of the target vehicle.

[0103] The vehicle state of the target vehicle may represent a power-on state, a power-off state, etc. When a high-voltage interlock fault occurs in at least one motor phase, it indicates that a problem occurs in the vehicle, and the vehicle state of the target vehicle needs to be obtained, and a high-voltage interlock fault handling strategy is determined according to the vehicle state of the target vehicle.

[0104] Step S502: based on the vehicle state of the target vehicle, determine a high-voltage interlock fault handling strategy corresponding to the vehicle state of the target vehicle.

[0105] Specifically, the above step S502 includes: Step S5021, if the vehicle state of the target vehicle is the power-off state, detect whether the target vehicle is in the high voltage state.

[0106] Step S5022: If the target vehicle is not on high voltage, the control display module lights up the red system fault indicator light and controls the display module to issue a text reminder.

[0107] If the air conditioning control module reports a high-voltage interlock fault and the target vehicle is in the power-off state, further confirm whether the entire vehicle is on high voltage. If not, the entire vehicle is prohibited from being on high voltage. The instrument lights up the red system fault indicator light and the instrument text reminds the user "High-voltage interlock fault, please go to the 4S shop for repair."

[0108] Step S5023, if the target vehicle is on high voltage, control the target vehicle to lower the high voltage, control the display module to light up the red system fault indicator light, and control the display module to give a text reminder.

[0109] If the air conditioning control module reports a high-voltage interlock fault and the target vehicle is in a power-off state, further confirm whether the vehicle is powered on. If the vehicle is powered on, the vehicle will be powered off. The red system fault indicator light on the instrument panel will light up, and the user will be reminded "High-voltage interlock fault, please go to the 4S shop for repair."

[0110] Step S5024, if the vehicle status of the target vehicle is powered on, the control display module lights up the yellow system fault indicator light, and controls the display module to issue a text reminder.

[0111] If the air conditioning control module reports a high-voltage interlock fault and the current vehicle status is powered on, further confirm whether the vehicle is powered on. If the vehicle is powered on, the vehicle will be powered off, the red system fault indicator light will be on, and the instrument will remind the user "High-voltage interlock fault, please go to the 4S shop for repair."

[0112] Step S5025, if the vehicle state of the target vehicle changes from the power-on state to the power-off state, the control display module lights up the red system fault indicator light, and controls the display module to issue a text reminder.

[0113] If the air conditioning control module reports a high-voltage interlock fault, and the current vehicle state is powered on, the vehicle will not reduce the high voltage, the instrument will light up the yellow system fault indicator, and the instrument will remind the user "high-voltage interlock fault, please go to the 4S store for repair". The vehicle state is continuously monitored. If the vehicle is returned to the powered-off state through human operation, the above step S5023 is followed to handle the fault.

[0114] Please refer to Figure 8 , Figure 8 Detailed description is a flow chart of another high-voltage interlock fault detection method provided according to an embodiment of the present invention.

[0115] The air conditioning controller includes a first control module, a second control module, a first acquisition module, a second acquisition module, a first analysis module, a second analysis module, a first processing module and a second processing module.

[0116] In step S1, the first control module controls the switch tubes G3, G4 and G5 to be closed according to the timing sequence, and the second control module controls the switch tubes G7 and G8 to be closed according to the timing sequence, and the other switch tubes remain in the open state.

[0117] Step S2 , the first acquisition module respectively acquires the sampled voltage U1 of the voltage-dividing resistor R1 and the sampled voltage U2 of the voltage-dividing resistor R2 , and sends the sampled voltage U1 and the sampled voltage U2 to the first analysis module.

[0118] Step S3 , the second acquisition module acquires the sampled voltage U3 of the voltage-dividing resistor R3 and the sampled voltage U4 of the voltage-dividing resistor R4 , and sends the sampled voltage U3 and the sampled voltage U4 to the second analysis module.

[0119] Step S4, repeating steps S1, S2 and S3, performing voltage acquisition through the first acquisition module and the second acquisition module, and sending the sampled voltage U1 and the sampled voltage U2 to the first analysis module corresponding to the first acquisition module, and sending the sampled voltage U3 and the sampled voltage U4 to the second analysis module corresponding to the second acquisition module.

[0120] Step S5: The first analysis module and the second analysis module compare the sampled voltages collected by them with the voltage threshold respectively. If the two voltage sampling values ​​of the same voltage-dividing resistor are both less than the voltage threshold, it is determined to be a high-voltage interlock fault.

[0121] The detection method of high-voltage interlock fault provided in this embodiment monitors the connection status of high-voltage connectors through the software interlock detection circuit in the air-conditioning control module, thereby avoiding the problem of false alarm of high-voltage interlock fault of the whole vehicle due to the failure of the low-voltage hard-wire interlock terminal or the momentary interruption of the high-voltage interlock signal in the vehicle under large vibration conditions, reducing the failure rate of high-voltage interlock detection and improving the robustness of high-voltage interlock detection. It further avoids the problem of EMC interference coupling of the control board circuit due to the use of low-voltage hard-wire interlock circuits, and at the same time avoids the increase in the cost of low-voltage wiring harnesses, low-voltage connectors or detection chips caused by the use of hard-wire interlock circuits, thereby reducing system costs.

[0122] In addition, the switch tubes in the air conditioning control module product are reused, and the opening and closing of the corresponding switch tubes are controlled in sequence. The connection status of the two connectors on the loop and the integrity of the entire circuit can be monitored simultaneously through the bus voltage and the voltage detection value at both ends of the sampling resistor, and the high-voltage circuit is rechecked multiple times to ensure the reliability of the detection. The system of the present invention has high integration, a wider detection range, high reliability and robustness of the detection results, and extremely saves the cost of high-voltage interlock detection.

[0123] In addition, the high-voltage interlocking and insulation fault handling strategies are further optimized through processing strategies. Based on the vehicle usage scenario analysis, the vehicle usage experience when a high-voltage interlocking fault occurs is improved while ensuring personnel safety to the greatest extent.

[0124] A high-voltage interlock fault detection device is also provided in an embodiment of the present invention. The device is used to implement the above-mentioned method embodiment and preferred implementation mode, and will not be repeated hereafter. As used below, the term "unit" can implement a combination of software and / or hardware of a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived. The device in the embodiment of the present invention is presented in the form of a functional unit, where the functional unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above-mentioned functions.

[0125] The device is applied to an air-conditioning control system, which includes an air-conditioning controller and an air-conditioning compressor motor. The midpoint of each phase bridge arm in the three-phase bridge arm of the air-conditioning controller is respectively connected to different phases of the air-conditioning compressor motor, and each phase bridge arm includes an upper bridge arm switch tube and a lower bridge arm switch tube; and the device includes: a switch tube control module, which is used to control each bridge arm switch tube in the first switch tube combination for detecting high-voltage interlocking faults in the three-phase bridge arm of the air-conditioning controller to be turned on, so that the first voltage of the first voltage-dividing resistor for detecting high-voltage interlocking faults is generated at both ends of each first voltage-dividing resistor; wherein each first voltage-dividing resistor is respectively connected to different bridge arm switch tubes in the first switch tube combination; a fault determination module, which is used to determine whether a high-voltage interlocking fault occurs in the motor phase corresponding to each first voltage-dividing resistor according to a comparison result of the first voltage of the first voltage-dividing resistor for detecting high-voltage interlocking faults and a voltage threshold, wherein the motor phase corresponding to the first voltage-dividing resistor is one phase of the air-conditioning compressor motor.

[0126] In a possible implementation, the fault determination module is further configured to determine that a high voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor when a first voltage of the first voltage-dividing resistor for detecting a high voltage interlock fault is less than a voltage threshold.

[0127] In one possible implementation, the fault determination module is further used to control each bridge arm switch tube in the first switch tube combination for detecting the high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller to turn on again when the first voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault is less than the voltage threshold, so that the second voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault is generated at both ends of each first voltage-dividing resistor; when the first voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault and the second voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault are both less than the voltage threshold, it is determined that a high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor; when the first voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault is less than the voltage threshold and the second voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault is not less than the voltage threshold, it is determined that no high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor.

[0128] In a possible implementation, the switch tube control module is further used to control the bridge arm switch tube in the first switch tube combination that is not connected to the first voltage-dividing resistor to be turned on at a first moment; and to control the bridge arm switch tube in the first switch tube combination that is connected to the first voltage-dividing resistor to be turned on at a second moment.

[0129] In a possible implementation, the air conditioning control system further includes a heating controller and a heating resistor; and the above device further includes: A heating controller control module is used to control each switch tube in the second switch tube combination of the heating controller for detecting high-voltage interlock faults to be turned on, so that a third voltage for detecting high-voltage interlock faults is generated at both ends of each second voltage-dividing resistor, wherein each second voltage-dividing resistor is respectively connected to different switch tubes in the second switch tube combination; a first heating controller determination module is used to determine, for each second voltage-dividing resistor, whether a high-voltage interlock fault occurs in the phase corresponding to the second voltage-dividing resistor according to a comparison result between the third voltage of the second voltage-dividing resistor for detecting high-voltage interlock faults and a voltage threshold, wherein the phase corresponding to the second voltage-dividing resistor is one phase of the heating resistor; a second heating controller determination module is used to determine that a high-voltage interlock fault occurs in the phase corresponding to the second voltage-dividing resistor when the third voltage of the second voltage-dividing resistor for detecting high-voltage interlock faults is less than the voltage threshold.

[0130] In a possible implementation, the second switch tube combination includes at least two switch tubes; wherein the heating controller control module is further used to control at least two switch tubes of the heating controller for detecting high-voltage interlock fault to be turned on at the second moment.

[0131] In a possible implementation, the above-mentioned device also includes: an acquisition module, which is used to obtain the specific fault position of the high-voltage interlock when a high-voltage interlock fault occurs in the target phase; wherein the target phase includes the motor phase corresponding to the first voltage-dividing resistor and / or the phase corresponding to the second voltage-dividing resistor; a processing strategy determination module, which is used to determine the high-voltage interlock fault processing strategy corresponding to the high-voltage interlock fault position based on the high-voltage interlock fault position.

[0132] In one possible implementation, the processing strategy determination module is further used to, if the high-voltage interlock fault position is the motor phase corresponding to the first voltage-dividing resistor, determine the high-voltage interlock fault processing strategy corresponding to the motor, including controlling the entire vehicle not to reduce the high voltage, turning off each switch tube of the three-phase bridge arm of the air-conditioning controller, limiting the power of the air-conditioning controller to a first preset value, controlling the instrument to light up a system fault indicator light of a first target color, and controlling the display module to issue a first text reminder; if the high-voltage interlock fault position is the phase corresponding to the second voltage-dividing resistor, determine the high-voltage interlock fault processing strategy corresponding to the target, including controlling the entire vehicle not to reduce the high voltage, turning off each switch tube of the heating controller, limiting the power of the heating controller to a second preset value, controlling the instrument to light up a system fault indicator light of a second target color, and controlling the display module to issue a second text reminder.

[0133] In one possible implementation, the processing strategy determination module is further used to control the display module to light up a yellow system fault indicator light if the vehicle status of the target vehicle is in a powered-on state, and to control the display module to give a text reminder; if the vehicle status of the target vehicle changes from a powered-on state to a powered-off state, control the display module to light up a red system fault indicator light, and to control the display module to give a text reminder.

[0134] reference Fig. 9 , Fig. 91 is a schematic diagram of the hardware structure of a computer device provided according to an embodiment of the present invention. The computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses for communication, and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed in the computer device, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used with multiple memories and multiple memories. Similarly, multiple vehicles can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). The processor 10 can be a central processing unit, a network processor, or a combination thereof. Among them, the processor 10 can further include a hardware chip. The above-mentioned hardware chip can be a dedicated integrated circuit, a programmable logic device, or a combination thereof. The above-mentioned programmable logic device can be a complex programmable logic device, a field programmable logic gate array, a general array logic, or any combination thereof. Among them, the memory 20 stores instructions that can be executed by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment. The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required by at least one function; the data storage area may store data created according to the use of the vehicle, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage devices. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof. The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid-state hard disk; the memory 20 may also include a combination of the above types of memories. The computer device also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30, and the output device 40 may be connected via a bus or in other ways. The input device 30 can receive input digital or character information, and generate key signal input related to the user settings and function control of the computer device, such as a touch screen, a keypad, a mouse, a trackpad, a touch pad, an indicator stick, one or more mouse buttons, a trackball, a joystick, etc.The output device 40 may include a display device, an auxiliary lighting device (e.g., LED), a tactile feedback device (e.g., a vibration motor), etc. The above display device includes but is not limited to a liquid crystal display, a light emitting diode, a display, and a plasma display. In some optional embodiments, the display device may be a touch screen.

[0135] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0136] A portion of the embodiments of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of computer program instructions in a computer-readable medium includes, but is not limited to, source files, executable files, installation package files, etc., and accordingly, the way in which the computer program instructions are executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0137] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A method for detecting a high voltage interlock fault, characterized in that: Applied to an air conditioning control system, the air conditioning control system includes an air conditioning controller and an air conditioning compressor motor, the midpoint of each phase bridge arm in the three-phase bridge arm of the air conditioning controller is respectively connected to different phases of the air conditioning compressor motor, and each phase bridge arm includes an upper bridge arm switch tube and a lower bridge arm switch tube; and the method includes: Controlling each bridge arm switch tube in the first switch tube combination for detecting high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller to be turned on, so that the first voltage of the first voltage-dividing resistor for detecting high-voltage interlock fault is generated at both ends of each first voltage-dividing resistor; wherein each first voltage-dividing resistor is respectively connected to different bridge arm switch tubes in the first switch tube combination; For each first voltage-dividing resistor, whether a high-voltage interlocking fault occurs in the motor phase corresponding to the first voltage-dividing resistor is determined based on the comparison result between the first voltage of the first voltage-dividing resistor for detecting a high-voltage interlocking fault and the voltage threshold, wherein the motor phase corresponding to the first voltage-dividing resistor is one phase of the air-conditioning compressor motor.

2. The method for detecting a high voltage interlock fault according to claim 1, characterized in that: Determining whether a high-voltage interlock fault occurs in a motor phase corresponding to the first voltage-dividing resistor according to a comparison result between a first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault and a voltage threshold comprises: When the first voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault is less than the voltage threshold, it is determined that the motor phase corresponding to the first voltage-dividing resistor has a high-voltage interlock fault.

3. The method for detecting a high voltage interlock fault according to claim 1, characterized in that: Determining whether a high-voltage interlock fault occurs in a motor phase corresponding to the first voltage-dividing resistor according to a comparison result between a first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault and a voltage threshold comprises: When the first voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault is less than the voltage threshold, each bridge arm switch tube in the first switch tube combination for detecting the high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller is controlled to be turned on again, so that the second voltage of the first voltage-dividing resistor for detecting the high-voltage interlock fault is generated at both ends of each first voltage-dividing resistor; When a first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault and a second voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault are both less than a voltage threshold, it is determined that a high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor; When the first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault is less than a voltage threshold and the second voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault is not less than a voltage threshold, it is determined that no high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor.

4. The method for detecting a high voltage interlock fault according to claim 1, characterized in that: Controlling each bridge arm switch tube in the first switch tube combination for detecting high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller to be turned on includes: At a first moment, the bridge arm switch tube in the first switch tube combination that is not connected to the first voltage-dividing resistor is controlled to be turned on; At the second moment, the bridge arm switch tube connected to the first voltage-dividing resistor in the first switch tube combination is controlled to be turned on.

5. The method for detecting a high voltage interlock fault according to claim 1, characterized in that: The air conditioning control system further includes a heating controller and a heating resistor; and the method further includes: Controlling each switch tube in the second switch tube combination for detecting high-voltage interlock fault of the heating controller to be turned on, so that a third voltage for detecting high-voltage interlock fault is generated at both ends of each second voltage-dividing resistor, wherein each second voltage-dividing resistor is respectively connected to different switch tubes in the second switch tube combination; For each second voltage-dividing resistor, determining whether a high-voltage interlocking fault occurs in a phase corresponding to the second voltage-dividing resistor according to a comparison result between a third voltage of the second voltage-dividing resistor for detecting a high-voltage interlocking fault and a voltage threshold, wherein the phase corresponding to the second voltage-dividing resistor is a phase of the heating resistor; When the third voltage of the second voltage-dividing resistor for detecting the high-voltage interlock fault is less than the voltage threshold, it is determined that the phase corresponding to the second voltage-dividing resistor has a high-voltage interlock fault.

6. The method for detecting a high voltage interlock fault according to claim 5, characterized in that: The second switch tube combination includes at least two switch tubes, wherein each switch tube in the second switch tube combination for detecting a high-voltage interlock fault of the heating controller is controlled to be turned on, including: At the second moment, at least two switching tubes of the heating controller for detecting a high-voltage interlock fault are controlled to be turned on.

7. The method for detecting a high voltage interlock fault according to claim 5, characterized in that: The method further comprises: When a high-voltage interlock fault occurs in the target phase, a specific high-voltage interlock fault position is obtained; wherein the target phase includes the motor phase corresponding to the first voltage-dividing resistor and / or the phase corresponding to the second voltage-dividing resistor; Based on the high-voltage interlock fault position, a high-voltage interlock fault processing strategy corresponding to the high-voltage interlock fault position is determined.

8. The method for detecting a high voltage interlock fault according to claim 7, characterized in that: The determining, based on the high-voltage interlock fault position, a high-voltage interlock fault processing strategy corresponding to the high-voltage interlock fault position includes: If the high-voltage interlock fault position is the motor phase corresponding to the first voltage-dividing resistor, determining the high-voltage interlock fault handling strategy corresponding to the motor includes controlling the whole vehicle not to reduce the high voltage, shutting down each switch tube of the three-phase bridge arm of the air-conditioning controller, limiting the power of the air-conditioning controller to a first preset value, controlling the instrument to light up a first target color system fault indicator light, and controlling the display module to issue a first text reminder; If the high-voltage interlock fault position is the phase corresponding to the second voltage-dividing resistor, the high-voltage interlock fault handling strategy corresponding to the target is determined, including controlling the entire vehicle not to reduce high voltage, turning off each switch tube of the heating controller, limiting the power of the heating controller to a second preset value, controlling the instrument to light up the system fault indicator light of the second target color, and controlling the display module to issue a second text reminder.

9. A high voltage interlock fault detection device, characterized in that: Applied to an air conditioning control system, the air conditioning control system includes an air conditioning controller and an air conditioning compressor motor, the midpoint of each phase bridge arm in the three-phase bridge arm of the air conditioning controller is respectively connected to different phases of the air conditioning compressor motor, and each phase bridge arm includes an upper bridge arm switch tube and a lower bridge arm switch tube; And the device comprises: A switch tube control module, used for controlling each bridge arm switch tube in the first switch tube combination for detecting high-voltage interlock fault in the three-phase bridge arm of the air-conditioning controller to be turned on, so that the first voltage of the first voltage-dividing resistor for detecting high-voltage interlock fault is generated at both ends of each first voltage-dividing resistor; wherein each first voltage-dividing resistor is respectively connected to different bridge arm switch tubes in the first switch tube combination; A fault determination module is used to determine, for each first voltage-dividing resistor, whether a high-voltage interlock fault occurs in the motor phase corresponding to the first voltage-dividing resistor based on a comparison result between a first voltage of the first voltage-dividing resistor for detecting a high-voltage interlock fault and a voltage threshold, wherein the motor phase corresponding to the first voltage-dividing resistor is a phase of the air-conditioning compressor motor.

10. A vehicle, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the high-voltage interlock fault detection method according to any one of claims 1 to 8 by executing the computer instructions.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the high-voltage interlock fault detection method according to any one of claims 1 to 8.

12. A computer program product, characterized in that The method comprises computer instructions, wherein the computer instructions are used to cause a computer to execute the high-voltage interlock fault detection method according to any one of claims 1 to 8.

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