Insulation Detection Method, Device, Equipment, System and Storage Medium

Abstract

The present application provides an insulation detection method, device, equipment, system and storage medium. The method is applied to the insulation detection equipment of a vehicle. The insulation detection equipment is connected to the drive execution unit of the vehicle, and the drive execution unit is respectively connected to the battery pack circuit and the three-phase bus circuit of the vehicle. The method includes: obtaining vehicle status information; judging the vehicle working condition according to the vehicle status information; generating a drive control instruction according to the vehicle working condition; and sending the drive control instruction to the drive execution unit, so that the drive execution unit controls the vehicle to connect the three-phase bus circuit to the battery pack circuit in the state where the motor controller is not enabled according to the drive control instruction, and perform insulation detection.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle automation, and particularly to an insulation detection method, device, equipment, system and storage medium. Background Art

[0002] With the popularization of electric vehicles, higher requirements are put forward for the safety performance of electric vehicles. The power battery of an electric vehicle is a high-voltage platform of 400 - 800V, with extremely high danger. Therefore, the insulation detection of electric vehicles is an issue that cannot be ignored. The current mainstream insulation detection scheme is the bridge method, in which the motor controller is not enabled and the inverter switching tubes are all in the off state. The traditional circuit model is effective and can accurately calculate the insulation resistance of the DC side bus to the ground. However, this model ignores the calculation of the insulation resistance of the AC side bus to the ground. If there is a leakage in the three-phase bus of the AC side, this method cannot detect it, which will pose a safety hazard.

[0003] Currently, insulation detection can also be achieved through the motor drive system. After the vehicle stops and before the motor drive system is powered off, obtain the current setting information of the motor; generate a control signal according to the current setting information so that the motor controller drives the motor according to the control signal; collect the current of the motor, and generate current detection information according to the collected current of the motor; judge whether the insulation condition of the motor drive system is normal according to the current detection information and the current setting information.

[0004] However, the prior art can only achieve insulation detection after the motor system has been powered on and running, and cannot avoid the safety hazards caused by the decline in insulation performance during the system stop operation, resulting in low vehicle safety performance. Summary of the Invention

[0005] The present application provides an insulation detection method, device, equipment, system and storage medium, so as to solve the technical problem that the prior art can only achieve insulation detection after the motor system has been powered on and running, and cannot avoid the safety hazards caused by the decline in insulation performance during the system stop operation, resulting in low vehicle safety performance.

[0006] In a first aspect, the present application provides an insulation detection method, which is applied to an insulation detection device of a vehicle. The insulation detection device is connected to a drive execution unit of the vehicle, and the drive execution unit is respectively connected to a battery pack circuit and a three-phase bus circuit of the vehicle. The method includes:

[0007] Obtain vehicle status information;

[0008] Judge the vehicle working condition according to the vehicle status information;

[0009] Generate a drive control instruction according to the vehicle working condition;

[0010] Send the drive control instruction to the drive execution unit, so that the drive execution unit controls the vehicle to connect the three-phase bus circuit to the battery pack loop for insulation detection in the state where the motor controller is not enabled according to the drive control instruction.

[0011] Here, the present application provides a safe and effective method for insulating detection of an electric vehicle battery pack and a three-phase bus. Before insulating detection of the vehicle's battery pack and three-phase bus, the vehicle's working condition is first judged. Under the condition of ensuring safety, through the inherent battery pack insulation detection function of the Battery Management System (BMS), the insulation conditions of the battery pack and the three-phase bus can be judged simultaneously, avoiding potential safety hazards caused by the decline of insulation performance during the system stop operation, and improving the safety performance of the vehicle.

[0012] Optionally, the vehicle state information includes at least one of vehicle working state, vehicle fault information, vehicle start information, battery pack working state, battery management system fault information, motor working state, motor fault information, inverter working state, and battery pack insulation detection discrimination result.

[0013] Optionally, judging the vehicle working condition according to the vehicle state information includes:

[0014] If the vehicle state information is that the battery pack is under high voltage, the motor is on standby, and the inverter is in the off-switch state, it is determined that the vehicle working condition is the system stop operation state.

[0015] Among them, the present application determines that the vehicle is currently in the system stop operation state according to the battery pack under high voltage, the motor on standby, and the inverter off-switch state, and performs insulation detection in this state, effectively avoiding potential safety hazards caused by the decline of insulation performance during power-on operation, and further improving the reliability of vehicle insulation detection and the safety performance of the vehicle.

[0016] Optionally, generating the drive control instruction according to the vehicle working condition includes:

[0017] If the vehicle working condition is the system stop operation state, generate a drive control instruction.

[0018] Here, after the present application determines that the vehicle is in the system stop operation state, a drive control instruction can be generated, so as to realize insulation detection under the condition of ensuring safety.

[0019] Optionally, the drive execution unit includes a drive control unit, a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, and a seventh relay;

[0020] Correspondingly, sending the drive control instruction to the drive execution unit to enable the drive execution unit to control the vehicle to connect the three-phase bus circuit to the battery pack loop in a state where the motor controller is not enabled, and perform insulation detection through the battery pack insulation detection line, includes:

[0021] Sending the drive control instruction to the drive control unit to enable the drive control unit to control the closing and disconnection of the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay, and the seventh relay, so as to control the vehicle to connect the three-phase bus circuit to the battery pack loop in a state where the motor controller is not enabled, and perform insulation detection through the battery pack insulation detection line.

[0022] Wherein, in the present application, by controlling the on / off of seven relays, the three-phase bus circuit is connected to the battery pack loop, and the three-phase bus circuit and the battery pack loop can be simultaneously subjected to insulation detection through the battery pack insulation detection line. The implementation method is simple and the control is accurate, further improving the reliability of insulation detection and the safety performance of the vehicle.

[0023] Optionally, after sending the drive control instruction to the drive control unit, it further includes:

[0024] If the insulation detection result shows an insulation fault, a fault prompt is issued.

[0025] Here, in the present application, after detecting an insulation fault, a fault prompt can be directly issued to prompt the user to make corresponding handling, further improving the safety performance of the vehicle.

[0026] In a second aspect, the present application provides an insulation detection device, which is applied to an insulation detection device of a vehicle. The insulation detection device is connected to a drive execution unit of the vehicle, and the drive execution unit is respectively connected to a battery pack loop and a three-phase bus circuit of the vehicle. The device includes:

[0027] An acquisition module, configured to acquire vehicle state information;

[0028] A judgment module, configured to judge the vehicle working condition according to the vehicle state information;

[0029] An instruction generation module, configured to generate a drive control instruction according to the vehicle working condition;

[0030] A sending module, configured to send the drive control instruction to the drive execution unit to enable the drive execution unit to control the vehicle to connect the three-phase bus circuit to the battery pack loop in a state where the motor controller is not enabled, and perform insulation detection through the battery pack insulation detection line.

[0031] Optionally, the vehicle state information includes at least one of vehicle working state, vehicle fault information, vehicle startup information, battery pack working state, battery management system fault information, motor working state, motor fault information, inverter working state, and battery pack insulation detection and discrimination result.

[0032] Optionally, the judgment module is specifically configured to:

[0033] If the vehicle state information is that the battery pack has gone off high voltage, the motor is on standby, and the inverter switch tube state, it is determined that the vehicle working condition is the system stop operation state.

[0034] Optionally, the instruction generation module is specifically configured to:

[0035] If the vehicle working condition is the system stop operation state, a drive control instruction is generated.

[0036] Optionally, the drive execution unit includes a drive control unit, a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, and a seventh relay;

[0037] Correspondingly, the sending module is specifically configured to:

[0038] Send the drive control instruction to the drive control unit, so that the drive control unit controls the closing and opening of the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay, and the seventh relay, and controls the vehicle to connect the three-phase bus circuit to the battery pack loop in the state where the motor controller is not enabled, and perform insulation detection through the battery pack insulation detection line.

[0039] Optionally, after the sending module sends the drive control instruction to the drive control unit, the above device further includes:

[0040] A prompt module, configured to send a fault prompt if the insulation detection result shows an insulation fault.

[0041] In a third aspect, the present application provides an insulation detection device, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the insulation detection method as described in the first aspect or the optional manner of the first aspect.

[0042] Fourthly, the present application provides an insulation detection system, including a driving execution unit of a vehicle and the insulation detection device as described in the third aspect. The insulation detection device is connected to the driving execution unit, and the driving execution unit is respectively connected to the battery pack circuit and the three-phase bus circuit of the vehicle.

[0043] Fifthly, the present invention provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the insulation detection method as described in the first aspect and various possible designs of the first aspect is implemented.

[0044] Sixthly, the present invention provides a computer program product, including a computer program. When the computer program is executed by a processor, the insulation detection method as described in the first aspect and various possible designs of the first aspect is implemented.

[0045] The insulation detection method, device, equipment, system and storage medium provided by the present application. Among them, before performing insulation detection on the battery pack and the three-phase bus of the vehicle, the method first judges the working condition of the vehicle. Under the condition of ensuring safety, through the inherent battery pack insulation detection function of the BMS, the insulation conditions of the battery pack and the three-phase bus can be judged simultaneously, avoiding potential safety hazards caused by the decline of insulation performance during the system shutdown period, and improving the safety performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0047] Figure 1 It is a schematic diagram of the architecture of an insulation detection system provided by an embodiment of the present application;

[0048] Figure 2 It is another schematic diagram of the architecture of an insulation detection system provided by an embodiment of the present application;

[0049] Figure 3 It is a schematic flowchart of an insulation detection method provided by an embodiment of the present application;

[0050] Figure 4 It is another schematic flowchart of an insulation detection method provided by an embodiment of the present application;

[0051] Figure 5 It is a schematic diagram of the structure of an insulation detection device provided by an embodiment of the present application;

[0052] Figure 6 This is a schematic structural diagram of an insulation detection device provided by an embodiment of the present application.

[0053] Through the above-mentioned drawings, specific embodiments of the present disclosure have been shown, and will be described in more detail hereinafter. These drawings and the textual description are not intended to limit the scope of the concept of the present disclosure in any way, but to illustrate the concept of the present disclosure to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0054] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0055] The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims and above-mentioned drawings of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these process, method, product or device.

[0056] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or fully authorized by all parties. And the collection, use and processing of relevant data need to comply with the relevant laws, regulations and standards of relevant countries and regions, and corresponding operation entrances are provided for users to choose to authorize or refuse.

[0057] First, the following explanations are made for the nouns involved in the embodiments of the present application:

[0058] Bridge method: Also known as the national standard method, it is a commonly used method for battery pack insulation detection. This function is implemented by the battery management system BMS. The bridge method is also called the passive detection method, mainly because high voltage is required for insulation detection.

[0059] Inverter: It refers to a device in an electric vehicle that, according to the instructions of the controller, realizes the conversion of high-voltage direct current into three-phase alternating current voltage through the on-off of its own power switches, and is one of the core devices of the electric vehicle.

[0060] BMS: Battery Management System, which manages battery cells to prevent overcharging and over-discharging, extends service life, can monitor the real-time state of the battery, collect and process various battery signals, control each relay to realize the high-voltage output and shutdown of the whole vehicle, and conduct insulation detection of the battery pack.

[0061] Microcontroller Unit (MCU): Motor controller, which receives instructions, realizes the output speed and torque of the motor by controlling the inverter, and at the same time monitors and processes motor faults.

[0062] With the popularization of electric vehicles, higher requirements are put forward for the safety performance of electric vehicles. The power battery of an electric vehicle is a high-voltage platform of 400 - 800V, with extremely high danger. Therefore, the insulation detection of electric vehicles is an issue that cannot be ignored. Currently, the mainstream insulation detection scheme is the bridge method, in which the motor controller is not enabled and the inverter switch tubes are all in the off state. The traditional circuit model is effective and can accurately calculate the insulation resistance of the DC side bus to the ground. However, this model ignores the calculation of the insulation resistance of the AC side bus to the ground. If there is a leakage in the three-phase bus of the AC side, this method cannot detect it, which will pose a safety hazard. It can be seen that how to conduct insulation on the electric vehicle battery pack and the three-phase bus has become an urgent technical problem to be solved. Currently, insulation detection can also be achieved through the motor drive system. After the vehicle stops and before the motor drive system is powered off, obtain the current setting information of the motor; generate a control signal according to the current setting information so that the motor controller drives the motor according to the control signal; collect the current of the motor, and generate current detection information according to the collected current of the motor; judge whether the insulation of the motor drive system is normal according to the current detection information and the current setting information. The above scheme is a method for separately detecting the insulation of the motor. The basis of this method is that the vehicle has been running, and the insulation detection can only be achieved after the motor system has been powered on and running. This method itself is extremely dangerous and cannot eliminate the safety hazards caused by the decline of insulation performance during the system stop operation, and the vehicle safety performance is low.

[0063] To solve the above problems, the embodiments of the present application provide an insulation detection method, device, equipment, system and storage medium. Among them, this method aims to solve the insulation detection of the electric vehicle battery pack and the three-phase bus. By designing a device, it realizes the simultaneous insulation detection of the battery pack and the three-phase bus through the bridge method when the MCU is not enabled and the inverter switch tubes are all in the off state, ensuring vehicle safety, having considerable economic applicability, and high vehicle safety performance.

[0064] Optionally, Figure 1 FIG. 1 is a schematic diagram of an engine emission control insulation detection system architecture provided by an embodiment of the present application. In Figure 1 the above architecture includes a drive execution unit 100 and an insulation detection device 101 of the vehicle. The insulation detection device 101 is connected to the drive execution unit 100, and the drive execution unit 100 is respectively connected to the battery pack circuit 102 and the three-phase bus circuit 103 of the vehicle.

[0065] Optionally, the insulation detection device 101 may include a signal unit and a central control unit.

[0066] Optionally, the signal unit: collects various information under preset conditions and sends the above information to the central control unit for processing.

[0067] Optionally, the central control unit: receives information from the signal unit, processes the information, and sends a drive instruction to the drive execution unit.

[0068] Optionally, the drive execution unit 100: includes seven relays and their control devices, receives instructions from the central control unit, and executes a preparation action and a recovery action.

[0069] The insulation detection device 101 may be the central control unit, MCU, processor of the vehicle, or other devices that implement the functions of the processor. It can be implemented by the processor reading instructions in the memory and executing the instructions, or by a chip circuit. The insulation detection device 101 can obtain the vehicle state information; judge the vehicle working condition according to the vehicle state information; generate a drive control instruction according to the vehicle working condition; send the drive control instruction to the drive execution unit, so that the drive execution unit connects the three-phase bus circuit to the battery pack circuit according to the drive control instruction in the state where the motor controller is not enabled, and performs insulation detection.

[0070] Exemplarily, Figure 2 FIG. 2 is another schematic diagram of an engine emission control insulation detection system architecture provided by an embodiment of the present application. As Figure 2 shown in Figure 1Based on this, the drive execution unit 100 includes seven relays: the first relay 0, the second relay 1, the third relay 2, the fourth relay 3, the fifth relay 4, the sixth relay 5, and the seventh relay 6. The first relay 0 is connected to any position in the positive electrode circuit of the battery pack. The rear end of the first relay 0 is connected in series with the second relay 1, the third relay 2, and the fourth relay 3, and the rear sides of the second relay 1, the third relay 2, and the fourth relay 3 are respectively connected to the output end of the inverter, that is, the starting end of the three-phase bus; the front end of the first relay 0 is connected in series with the seventh relay 6, the sixth relay 5, and the fifth relay 4, and the rear sides of the seventh relay 6, the sixth relay 5, and the fifth relay 4 are respectively connected to the three-phase input end of the motor, that is, the end of the three-phase bus; in the standby state of the system, the first relay 0 remains normally closed, and the rest of the relays remain normally open.

[0071] In a possible implementation manner, to ensure safety, information needs to be obtained from the BMS and the MCU: the vehicle working state, vehicle fault information, vehicle start information, battery pack working state, BMS fault information, motor working state, motor fault information, inverter working state, battery pack insulation detection and discrimination result; when the following preset conditions are met, that is, the vehicle is turned off, the battery pack is under high voltage, the motor is on standby, and the inverter switching tubes are off, the system enters standby preparation. At this time, the DC high-voltage circuit of the battery pack is disconnected from the three-phase bus circuit; when the vehicle start information is detected and there is no fault reported by the vehicle, BMS, and MCU, the system sends a message to enable the inverter (to keep it disconnected and not working), and enables the BMS to perform the high-voltage operation; perform the preparation action: disconnect the first relay 0, close the second relay 1, the third relay 2, the fourth relay 3, the fifth relay 4, the sixth relay 5, and the seventh relay 6. At this time, the three-phase bus is connected to the BMS insulation detection circuit; restore the BMS enable, the BMS operates and performs insulation detection; collect the BMS insulation detection result. After there is no problem, perform the restoration action: close the first relay 0, disconnect the second relay 1, the third relay 2, the fourth relay 3, the fifth relay 4, the sixth relay 5, and the seventh relay 6. If the insulation detection fails, wait for the BMS to report a fault; restore the inverter enable, and end.

[0072] It can be understood that Figure 2 the battery pack circuit 102 and the three-phase bus circuit 103 in

[0073] It can be understood that the structure schematically shown in the embodiments of the present application does not constitute a specific limitation on the architecture of the insulation detection system. In other feasible embodiments of the present application, the above architecture may include more or fewer components than those shown in the figure, or combine certain components, or split certain components, or have different component arrangements, which can be specifically determined according to the actual application scenario and are not limited herein. Figure 1The components shown can be implemented in hardware, software, or a combination of software and hardware.

[0074] In addition, the network architecture and service scenarios described in the embodiments of this application are for more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those of ordinary skill in the art will know that with the evolution of the network architecture and the emergence of new service scenarios, the technical solutions provided by the embodiments of this application are equally applicable to similar technical problems.

[0075] The technical solutions of this application will be described in detail below in conjunction with specific embodiments:

[0076] Figure 3 It is a schematic flowchart of an insulation detection method provided for the embodiments of this application. The embodiments of this application are applied to the insulation detection device of a vehicle. The insulation detection device is connected to the drive execution unit of the vehicle, and the drive execution unit is respectively connected to the battery pack circuit and the three-phase bus circuit of the vehicle. The execution entity can be Figure 1 or Figure 2 the insulation detection device 101 in, and the specific execution entity can be determined according to the actual application scenario. As Figure 3 shown, the method includes the following steps:

[0077] S301: Obtain vehicle status information.

[0078] Optionally, the vehicle status information includes at least one of the vehicle working status, vehicle fault information, vehicle start information, battery pack working status, battery management system fault information, motor working status, motor fault information, inverter working status, and battery pack insulation detection discrimination result.

[0079] Optionally, obtain information through the BMS and MCU.

[0080] S302: Judge the vehicle working condition according to the vehicle status information.

[0081] Optionally, judging the vehicle working condition according to the vehicle status information includes:

[0082] If the vehicle status information is that the battery pack is under high voltage, the motor is on standby, and the inverter is in the off-switch state, it is determined that the vehicle working condition is the system stop operation state.

[0083] Among them, if the vehicle simultaneously meets the conditions of the battery pack being under high voltage, the motor being on standby, and the inverter being in the off-switch state, the vehicle working condition can be accurately determined as the system stop operation state, ensuring the safety of vehicle insulation detection.

[0084] Optionally, the vehicle working condition can be judged according to the vehicle's flameout state. For example, if the vehicle is in the flameout state, it is determined that the vehicle working condition is the system stop operation state.

[0085] Optionally, the vehicle working condition can be determined according to the flameout state of the vehicle, the high voltage under the battery pack, the motor standby state, and the inverter switch-off state. For example, if the vehicle satisfies the conditions of vehicle flameout, high voltage under the battery pack, motor standby, and inverter switch-off state, it is determined that the vehicle working condition is the system stop operation state.

[0086] Among them, in the embodiment of the present application, according to the high voltage under the battery pack, the motor standby state, and the inverter switch-off state, it is determined that the vehicle is currently in the system stop operation state, and insulation detection is performed in this state, effectively avoiding potential safety hazards caused by the degradation of insulation performance during power-on operation, and further improving the reliability of vehicle insulation detection and the safety performance of the vehicle.

[0087] S303: Generate a drive control instruction according to the vehicle working condition.

[0088] Optionally, generating a drive control instruction according to the vehicle working condition includes:

[0089] If the vehicle working condition is the system stop operation state, generate a drive control instruction.

[0090] Here, in the embodiment of the present application, after determining that the vehicle is in the system stop operation state, a drive control instruction can be generated, so as to realize insulation detection while ensuring safety.

[0091] S304: Send the drive control instruction to the drive execution unit, so that the drive execution unit controls the vehicle to connect the three-phase bus circuit to the battery pack loop in the state where the motor controller is not enabled, and perform insulation detection.

[0092] Optionally, the drive execution unit includes a drive control unit, a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, and a seventh relay; correspondingly, sending the drive control instruction to the drive execution unit, so that the drive execution unit controls the vehicle to connect the three-phase bus circuit to the battery pack loop in the state where the motor controller is not enabled, and perform insulation detection through the battery pack insulation detection line, includes: sending the drive control instruction to the drive control unit, so that the drive control unit controls the closing and opening of the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay, and the seventh relay, and controls the vehicle to connect the three-phase bus circuit to the battery pack loop in the state where the motor controller is not enabled, and perform insulation detection through the battery pack insulation detection line.

[0093] Among them, in the embodiment of the present application, by controlling the on / off of seven relays, the three-phase bus circuit is connected to the battery pack loop, and the insulation detection of the three-phase bus circuit and the battery pack loop can be simultaneously performed through the battery pack insulation detection line. The implementation method is simple and the control is accurate, further improving the reliability of insulation detection and the safety performance of the vehicle.

[0094] The embodiment of the present application provides a safe and effective method for insulating detection of an electric vehicle battery pack and a three-phase bus. Before insulating detection of the vehicle's battery pack and three-phase bus, the vehicle's working condition is first judged. Under the condition of ensuring safety, through the inherent battery pack insulation detection function of the Battery Management System (BMS), the insulation conditions of the battery pack and the three-phase bus can be simultaneously judged, avoiding potential safety hazards caused by the decline of insulation performance during the system stop operation, and improving the safety performance of the vehicle.

[0095] Optionally, after sending the drive control instruction to the drive control unit, it further includes: if the insulation detection result shows an insulation fault, a fault prompt is issued.

[0096] Here, in the embodiment of the present application, after detecting an insulation fault, a fault prompt can be directly issued to prompt the user to make corresponding handling, further improving the safety performance of the vehicle.

[0097] Exemplarily, Figure 4 is a schematic flowchart of another insulation detection method provided by the embodiment of the present application. As Figure 4 shown in the method, the three-phase bus can be connected to the battery pack loop while ensuring high-voltage safety, thereby completing the insulation detection of the battery pack and the three-phase bus.

[0098] Figure 5 is a schematic structural diagram of an insulation detection device provided by the embodiment of the present application. As Figure 5 shown, the device of the embodiment of the present application includes an acquisition module 501, a judgment module 502, an instruction generation module 503, and a sending module 504. The insulation detection device here can be the insulation detection device 101 itself, or a chip or integrated circuit that realizes the function of the insulation detection device 101. It should be noted here that the division of the acquisition module 501, the judgment module 502, the instruction generation module 503, and the sending module 504 is only a division of logical functions, and physically the two can be integrated or independent.

[0099] Among them, the acquisition module is used to acquire vehicle state information;

[0100] The judgment module is used to judge the vehicle working condition according to the vehicle state information;

[0101] An instruction generation module, configured to generate a drive control instruction according to the vehicle working condition;

[0102] A sending module, configured to send the drive control instruction to a drive execution unit, so that the drive execution unit controls the vehicle to connect a three-phase bus circuit to a battery pack loop in a state where the motor controller is not enabled, and perform insulation detection through a battery pack insulation detection line.

[0103] Optionally, the vehicle state information includes at least one of vehicle working state, vehicle fault information, vehicle start information, battery pack working state, battery management system fault information, motor working state, motor fault information, inverter working state, and battery pack insulation detection discrimination result.

[0104] Optionally, the judgment module is specifically configured to:

[0105] If the vehicle state information is that the battery pack is under high voltage, the motor is in standby, and the inverter switch tube state, determine that the vehicle working condition is the system stop operation state.

[0106] Optionally, the instruction generation module is specifically configured to:

[0107] If the vehicle working condition is the system stop operation state, generate a drive control instruction.

[0108] Optionally, the drive execution unit includes a drive control unit, a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, and a seventh relay;

[0109] Correspondingly, the sending module is specifically configured to:

[0110] Send the drive control instruction to the drive control unit, so that the drive control unit controls the closing and opening of the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay, and the seventh relay, and controls the vehicle to connect the three-phase bus circuit to the battery pack loop in a state where the motor controller is not enabled, and perform insulation detection through the battery pack insulation detection line.

[0111] Optionally, after the sending module sends the drive control instruction to the drive control unit, the above device further includes:

[0112] A prompt module, configured to issue a fault prompt if the insulation detection result shows an insulation fault.

[0113] Figure 6 It is a schematic structural diagram of an insulation detection device provided by an embodiment of the present application. The components shown herein, their connections and relationships, and their functions are merely examples and do not limit the implementation of the present application described herein and / or required.

[0114] As shown Figure 6 in the figure, the insulation detection device includes: a processor 601 and a memory 602. Each component is interconnected using different buses and can be installed on a common motherboard or installed in other ways as needed. The processor 601 can process instructions executed within the insulation detection device, including instructions for graphic information stored in or on the memory to be displayed on an external input / output device (such as a display device coupled to an interface). In other embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Figure 6 In the figure, one processor 601 is taken as an example.

[0115] The memory 602, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the method of the insulation detection device in the embodiments of the present application (for example, the acquisition module 501, the judgment module 502, the instruction generation module 503, and the sending module 504 shown Figure 5 in the figure). The processor 601 executes various functional applications and data processing of the server by running the non-transitory software programs, instructions, and modules stored in the memory 602, that is, implements the method of the insulation detection device in the above method embodiments.

[0116] The insulation detection device may further include: an input device 603 and an output device 604. The processor 601, the memory 602, the input device 603, and the output device 604 can be connected through a bus or other means, Figure 6 and in the figure, connection through a bus is taken as an example.

[0117] The input device 603 can receive input digital or character information and generate key signal inputs related to the user settings and function controls of the insulation detection device, such as input devices like touchscreens, keypads, mice, or multiple mouse buttons, trackballs, joysticks, etc. The output device 604 can be an output device such as a display device of the insulation detection device. The display device may include, but is not limited to, liquid crystal displays (LCDs), light-emitting diode (LED) displays, and plasma displays. In some embodiments, the display device can be a touchscreen.

[0118] The insulation detection device of the embodiments of the present application can be used to execute the technical solutions in the above method embodiments of the present application. The implementation principles and technical effects are similar and will not be elaborated here.

[0119] The embodiments of the present application also provide a computer-readable storage medium. Computer-executable instructions are stored in the computer-readable storage medium. When the computer-executable instructions are executed by a processor, they are used to implement the insulation detection method in any one of the above.

[0120] The embodiments of the present application further provide a computer program product, including a computer program, which when executed by a processor, is used to implement the insulation detection method of any one of the above.

[0121] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling, direct coupling, or communication connection can be through some interfaces, and the indirect coupling or communication connection of devices or units can be in electrical, mechanical, or other forms.

[0122] In addition, each functional unit in various embodiments of the present application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0123] Those skilled in the art will readily think of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0124] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. An insulation detection method, characterized in that, An insulation detection device applied to a vehicle, the insulation detection device is connected to a drive execution unit of the vehicle, and the drive execution unit is respectively connected to a battery pack circuit and a three-phase bus circuit of the vehicle. The method includes: Obtain vehicle status information; Judge the vehicle working condition according to the vehicle status information; Generate a drive control instruction according to the vehicle working condition; Send the drive control instruction to the drive execution unit, so that the drive execution unit controls the vehicle to connect the three-phase bus circuit to the battery pack circuit in a state where the motor controller is not enabled, and perform insulation detection through the battery pack insulation detection line; The judging the vehicle working condition according to the vehicle status information includes: If the vehicle status information is that the battery pack is under high voltage, the motor is in standby, and the inverter switch tube state, it is determined that the vehicle working condition is the system stop operation state; The generating a drive control instruction according to the vehicle working condition includes: If the vehicle working condition is the system stop operation state, generate a drive control instruction; The drive execution unit includes a drive control unit, a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, and a seventh relay; Correspondingly, the sending the drive control instruction to the drive execution unit, so that the drive execution unit controls the vehicle to connect the three-phase bus circuit to the battery pack circuit in a state where the motor controller is not enabled, and perform insulation detection through the battery pack insulation detection line includes: Send the drive control instruction to the drive control unit, so that the drive control unit controls the closing and opening of the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay, and the seventh relay, and controls the vehicle to connect the three-phase bus circuit to the battery pack circuit in a state where the motor controller is not enabled, and perform insulation detection through the battery pack insulation detection line.

2. The method according to claim 1, wherein The vehicle status information includes at least one of vehicle working status, vehicle fault information, vehicle start information, battery pack working status, battery management system fault information, motor working status, motor fault information, inverter working status, and battery pack insulation detection discrimination result.

3. The method according to claim 1 or 2, characterized in that, After sending the drive control instruction to the drive control unit, it further includes: If the insulation detection result shows an insulation fault, issue a fault prompt.

4. An insulation detection device, characterized in that, An insulation detection device applied to a vehicle, the insulation detection device is connected to a drive execution unit of the vehicle, and the drive execution unit is respectively connected to a battery pack circuit and a three-phase bus circuit of the vehicle. The device includes: An acquisition module for acquiring vehicle status information; A judgment module for judging the vehicle working condition according to the vehicle status information; An instruction generation module for generating a drive control instruction according to the vehicle working condition; A sending module, configured to send the drive control instruction to the drive execution unit, so that the drive execution unit controls the vehicle to connect the three-phase bus circuit to the battery pack loop in a state where the motor controller is not enabled, and perform insulation detection through the battery pack insulation detection line; The determination module is specifically configured to: If the vehicle status information is that the battery pack is under high voltage, the motor is in standby, and the inverter switch tube state, determine that the vehicle working condition is the system stop operation state; The instruction generation module is specifically configured to: If the vehicle working condition is the system stop operation state, generate a drive control instruction; The drive execution unit includes a drive control unit, a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, and a seventh relay; Correspondingly, the sending module is specifically configured to: Send the drive control instruction to the drive control unit, so that the drive control unit controls the closing and opening of the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay, and the seventh relay, and controls the vehicle to connect the three-phase bus circuit to the battery pack loop in a state where the motor controller is not enabled, and perform insulation detection through the battery pack insulation detection line.

5. An insulation detection device, characterized in that, Comprising: At least one processor and a memory; The memory stores computer execution instructions; The at least one processor executes the computer execution instructions stored in the memory, so that the at least one processor executes the insulation detection method according to any one of claims 1 to 3.

6. An insulation detection system, characterized in that, Comprising a drive execution unit of the vehicle and the insulation detection device according to claim 5, the insulation detection device is connected to the drive execution unit, and the drive execution unit is respectively connected to the battery pack loop and the three-phase bus circuit of the vehicle.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer execution instructions, and when the processor executes the computer execution instructions, the insulation detection method according to any one of claims 1 to 3 is implemented.

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