Vehicle insulation detection method, device and equipment and storage medium

Abstract

The invention discloses a vehicle insulation detection method and device, equipment and a storage medium. The method is applied to a vehicle-mounted terminal, the vehicle-mounted terminal provides an ampere-scale trigger key, the vehicle-mounted terminal is connected with a battery management controller, and the method comprises the following steps: in response to a trigger signal of the ampere-scale trigger key, generating an ampere-scale activation instruction of a vehicle; the safety scale type activation instruction of the vehicle is sent to a battery management controller of the vehicle, so that the battery management controller controls the vehicle to enter an insulation detection working condition; the insulation detection working condition is that a direct-current charging socket pin of the vehicle is communicated with a high-voltage loop of the vehicle, and the insulation detection function of the battery management controller is closed; after the vehicle enters the insulation detection working condition, insulation detection starting information is generated and sent to the designated object, so that the designated object is prompted to start external detection equipment to conduct insulation detection on the vehicle. According to the method, insulation detection of different vehicle types can be realized under the condition that the development cost of external detection equipment is not increased.

Description

Technical Field

[0001] This application relates to the field of vehicle off-line testing, specifically to a vehicle insulation testing method and apparatus, an electronic device, and a storage medium. Background Technology

[0002] When the final vehicle rolls off the assembly line, insulation testing of the high-voltage system circuit is required to prevent electric shock to personnel and damage to high-voltage components. Since the high-voltage system is an independent and closed circuit after vehicle assembly, insulation testing cannot be performed directly from the outside. Therefore, specialized external testing equipment is typically used for insulation testing of the high-voltage circuit.

[0003] However, using this type of testing method requires the development of additional diagnostic communication functions in the external testing equipment. Furthermore, since the diagnostic commands for different vehicle models may be inconsistent, the testing equipment also needs to be developed to identify the vehicle model, which greatly increases the testing cost.

[0004] Therefore, how to meet the insulation testing requirements of various vehicle models without incurring high testing costs has become an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this application is to provide a vehicle insulation testing method, apparatus, device, and storage medium, which can solve or at least partially solve the problem in the related art that it is necessary to consume a lot of testing costs to develop testing equipment to meet the insulation testing needs of different vehicle models.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application provide a vehicle insulation detection method, applied to an in-vehicle infotainment system. The in-vehicle infotainment system is equipped with a safety-scale trigger button and is connected to a battery management controller. The method includes: In response to the trigger signal of the safety-mode trigger button, a safety-mode activation command for the vehicle is generated; The vehicle's safety-scale activation command is sent to the vehicle's battery management controller, so that the battery management controller controls the vehicle to enter the insulation detection mode; the insulation detection mode is when the DC charging socket pin of the vehicle is connected to the high-voltage circuit of the vehicle, and the insulation detection function of the battery management controller is turned off. After the vehicle enters the insulation testing condition, insulation testing start information is generated and sent to a designated object to prompt the designated object to start external testing equipment to perform insulation testing on the vehicle.

[0007] Optionally, the step of causing the battery management controller to control the vehicle to enter the insulation detection condition includes: The battery management controller is controlled to respond to the vehicle's safe-scale activation command and determine the corresponding DC charging start logic for the vehicle. The battery management controller is controlled to connect the high-voltage circuit of the vehicle according to the DC charging start logic, and the insulation detection function of the battery management controller is turned off, so that the vehicle enters the insulation detection condition.

[0008] Optionally, controlling the battery management controller to connect the vehicle's high-voltage circuit according to the DC charging start logic includes: The battery management controller determines the relays on the high-voltage circuit and their connection sequence according to the DC charging start logic. The battery management controller is controlled to close the relays sequentially according to the connection order.

[0009] Optionally, the method further includes: In response to the shutdown signal of the safety-mode trigger button, a safety-mode shutdown command for the vehicle is generated; The vehicle's safety-scale shutdown command is sent to the vehicle's battery management controller, so that the battery management controller controls the vehicle to exit the insulation detection mode.

[0010] Optionally, the step of causing the battery management controller to control the vehicle to exit the insulation detection condition includes: The battery management controller is controlled to respond to the vehicle's safe-scale shutdown command and determine the corresponding DC charging termination logic for the vehicle. The battery management controller is controlled to disconnect the high-voltage circuit of the vehicle according to the DC charging termination logic, and the insulation detection function of the battery management controller is activated so that the vehicle exits the insulation detection mode.

[0011] Optionally, controlling the battery management controller to disconnect the vehicle's high-voltage circuit according to the DC charging termination logic includes: The battery management controller determines the relays on the high-voltage circuit and the disconnection sequence of the relays on the high-voltage circuit according to the DC charging termination logic; The battery management controller is controlled to disconnect the relays sequentially according to the disconnection order.

[0012] Optionally, the external detection device is connected to the vehicle; the external detection device is used to output a detection voltage to the high-voltage circuit of the vehicle in response to an insulation detection start signal triggered by a specified object after the insulation detection start information is generated, determine the insulation resistance value of the high-voltage circuit based on the detection voltage, and determine the insulation detection result of the vehicle based on the insulation resistance value.

[0013] Secondly, this application provides a vehicle insulation detection device applied to an in-vehicle infotainment system. The in-vehicle infotainment system is equipped with a safety-type trigger button and is connected to a battery management controller. The device includes: An automatic activation command generation module is used to generate an automatic activation command for the vehicle in response to the trigger signal of the automatic trigger button. An automated activation command sending module is used to send the vehicle's automated activation command to the vehicle's battery management controller, so that the battery management controller controls the vehicle to enter the insulation detection mode; the insulation detection mode is when the DC charging socket pin of the vehicle is connected to the high-voltage circuit of the vehicle, and the insulation detection function of the battery management controller is turned off. An insulation test start information generation module is used to generate insulation test start information and send it to a designated object after the vehicle enters the insulation test condition, so as to prompt the designated object to start external testing equipment to perform insulation test on the vehicle.

[0014] Thirdly, embodiments of this application provide an electronic device including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the method described in the first aspect.

[0015] Fourthly, embodiments of this application provide a readable storage medium on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect.

[0016] Fifthly, embodiments of this application provide a vehicle that includes the electronic equipment described in the third aspect.

[0017] In this embodiment, the vehicle-mounted terminal provides a safety-scale trigger button, which is connected to the battery management controller. The vehicle-mounted terminal can respond to the trigger signal of the safety-scale trigger button to generate a safety-scale activation command for the vehicle. This command is then sent to the vehicle's battery management controller, causing the controller to put the vehicle into an insulation detection mode. The insulation detection mode is characterized by the DC charging socket pins of the vehicle being connected to the vehicle's high-voltage circuit, and the insulation detection function of the battery management controller being disabled. After the vehicle enters the insulation detection mode, insulation detection start information is generated and sent to a designated object, prompting the designated object to activate an external detection device to perform insulation detection on the vehicle. In this embodiment, by setting a safety-scale trigger button on the vehicle's infotainment system, there is no need to develop diagnostic communication for external testing equipment. The vehicle's infotainment system can send a safety-scale activation command to the battery management controller based on the trigger signal from the safety-scale trigger button. This controls the battery management controller to place the vehicle in the most suitable condition for insulation testing, and then notifies the designated object to start the external testing equipment to perform insulation testing on the vehicle. Furthermore, there is no need to spend significant resources developing adaptations for external testing equipment for different vehicle architectures; instead, the insulation testing condition can be internally controlled by the vehicle's infotainment system corresponding to each vehicle model. This achieves the goal of meeting the insulation testing needs of various vehicle models without incurring substantial testing costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart of the steps of a vehicle insulation testing method provided in an embodiment of this application; Figure 2 This is a schematic diagram of the high-voltage circuit of an electric vehicle according to an embodiment of the vehicle insulation testing method provided in this application; Figure 3 This is a schematic diagram of the external testing equipment for a vehicle insulation testing method provided in one embodiment of this application; Figure 4 This is a schematic diagram of the test gun head of a vehicle insulation testing method provided in an embodiment of this application; Figure 5 This is a schematic diagram of the detection connection of a vehicle insulation detection method provided in an embodiment of this application; Figure 6 This is a structural block diagram of a vehicle insulation testing device provided in one embodiment of this application. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0022] The vehicle insulation testing method provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0023] Insulation resistance is a core indicator for ensuring the safety of high-voltage systems in electric vehicles, directly affecting the risk of electric shock to passengers and vehicle reliability. During final vehicle assembly, insulation testing of the high-voltage system circuit is necessary to prevent electric shock and damage to high-voltage components. Since the high-voltage system is an independent and closed circuit after assembly, it's impossible to directly test its insulation from the outside. Common techniques involve connecting a dedicated testing probe from an external testing device to the vehicle's DC charging socket. The OBD (On-Board Diagnostics) male connector on the device is connected to the OBD female connector on the vehicle. The dedicated testing probe sends diagnostic commands through the OBD port to disable the insulation testing function of the Battery Management System (BMS) and sends a series of diagnostic instructions to close all relays in the high-voltage circuit, then outputs a test voltage as needed, thus achieving insulation testing of the vehicle's high-voltage circuit.

[0024] However, this method requires additional development of OBD port diagnostic communication functions on the external testing equipment, in addition to the high-voltage testing circuit necessary for insulation testing. This increases the complexity and development cost of the external testing equipment. Furthermore, the location and number of relays in the high-voltage circuit may vary across different vehicle models. To adapt to the insulation testing needs of different vehicle models, a vehicle model recognition function needs to be developed on the external testing equipment. This allows it to adapt to the insulation testing requirements of different vehicle models and send corresponding diagnostic commands, which also significantly increases the complexity and development cost of the external testing equipment, and raises the difficulty of its later maintenance.

[0025] To address the aforementioned issues, this application proposes a vehicle insulation testing method that can meet the insulation testing requirements of various vehicle models without incurring significant testing costs. This method is applied to an in-vehicle infotainment system, which provides a safety-scale trigger button and is connected to a battery management controller. The in-vehicle infotainment system may be equipped with a touchscreen display, and the safety-scale trigger button can be a soft button displayed in a graphical spatial format on the touchscreen display, supporting touch operation.

[0026] For example, during vehicle production, the entire vehicle's ECU (electronic control unit) is in a special state to facilitate production. This state is generally called "factory mode." Typically, the entire vehicle is in factory mode until it receives its certificate of conformity. In factory mode, inspectors have higher operational privileges, facilitating various vehicle tests. The vehicle's infotainment system can monitor whether the vehicle is currently in factory mode. If it confirms that the vehicle is in factory mode, a safety-specific trigger button is displayed on the touchscreen. After the vehicle leaves the factory, the ECU exits factory mode and enters user mode, which is more suited to the user's normal driving needs. If the infotainment system detects that the vehicle is not currently in factory mode, the safety-specific trigger button is disabled on the touchscreen. Through this process, the safety-specific trigger button is only displayed in factory mode. After the vehicle exits factory mode (i.e., after leaving the factory), the safety-specific trigger button is no longer displayed, preventing accidental operation by the user and potential safety issues.

[0027] For example, the safety trigger button can also be a physical button located outside the user's normal operating area. By placing the physical button in a place that is not easily accessible to the user, it can prevent accidental operation that could cause safety issues.

[0028] The Battery Management System (BMS) is used to monitor, manage, and protect the safe operation of the high-voltage circuit of the power battery. The vehicle's infotainment system and the BMS are primarily connected via in-vehicle network communication protocols. For example, the vehicle's infotainment system and the BMS can exchange data at high speed via a CAN (Controller Area Network) bus.

[0029] Reference Figure 1 This is a flowchart of a vehicle insulation testing method provided in an embodiment of this application, including the following steps: Step 101: In response to the trigger signal of the safety-mode trigger button, generate the safety-mode activation command for the vehicle; The trigger signal for the safety mode trigger button is generated when the touchscreen display on the vehicle's infotainment system senses the operator touching the button. The safety mode activation command adjusts the vehicle's status, putting it into safety mode mode. Safety mode mode represents the optimal vehicle condition for conducting safety compliance checks.

[0030] Step 102: Send the vehicle's safety-scale activation command to the vehicle's battery management controller, so that the battery management controller controls the vehicle to enter the insulation detection mode; the insulation detection mode is when the DC charging socket pin of the vehicle is connected to the high-voltage circuit of the vehicle, and the insulation detection function of the battery management controller is turned off. The insulation test condition represents the optimal vehicle state during insulation testing in safety regulations. Under this condition, the DC charging socket pins are connected to the vehicle's high-voltage circuit, and the battery management controller's insulation test function is disabled. The vehicle's DC charging socket, also known as a fast-charging socket, is used for rapid charging and supports high-power DC power transmission. The vehicle's high-voltage circuit is a system composed of the vehicle's power battery, drive motor, high-voltage distribution box, and other high-voltage components. It operates at a high voltage and is used for energy storage, distribution, and power conversion to power the vehicle. The battery management controller has a built-in insulation test function that monitors the insulation resistance of the battery pack's positive and negative terminals to ground in real time, thereby assessing the battery's insulation performance and preventing risks such as battery leakage and short circuits.

[0031] Step 103: After the vehicle enters the insulation testing condition, generate insulation testing start information and send it to the designated object to prompt the designated object to start the external testing equipment to perform insulation testing on the vehicle.

[0032] The insulation detection start information indicates that the vehicle has entered the insulation detection state and insulation detection can begin. The designated recipient can be a testing personnel. Generating and sending the insulation detection start information to the designated recipient can be done by displaying the information on the vehicle's touchscreen display or by sending it to a mobile terminal connected to the vehicle's infotainment system. Examples of mobile terminals connected to the vehicle's infotainment system include smartphones, tablets, e-book readers, MP3 (Moving Picture Experts Group Audio Layer III) players, MP4 (Moving Picture Experts Group Audio Layer IV) players, laptops, etc. The designated recipient can also be an external testing device that automatically starts upon receiving the insulation detection start information. The designated recipient can also be other smart devices that communicate with both the vehicle's infotainment system and external testing devices; this application does not impose specific limitations on this.

[0033] In this embodiment, after the testing personnel touches the safety-scale trigger button provided on the vehicle's infotainment system, the system can respond to the trigger signal and generate a safety-scale activation command for the vehicle. This command is then sent to the vehicle's battery management controller, causing the controller to put the vehicle into an insulation detection state. The insulation detection state is characterized by the DC charging socket pins being connected to the vehicle's high-voltage circuit, and the battery management controller's insulation detection function being disabled. After the vehicle enters the insulation detection state, the system can also generate insulation detection activation information and send it to a designated object, prompting the object to activate external testing equipment to perform insulation testing on the vehicle.

[0034] Through the above implementation process, a safety-scale trigger button is set up on the vehicle's infotainment system. There's no need to develop diagnostic communication for external testing equipment. The vehicle's infotainment system sends a safety-scale activation command to the battery management controller based on the trigger signal from the safety-scale trigger button. This controls the battery management controller to put the vehicle in the most suitable condition for insulation testing, and then notifies the designated object to activate the external testing equipment to perform insulation testing. For different vehicle architectures, there's no need to spend significant resources developing adaptations for external testing equipment for different models. Instead, the insulation testing condition can be internally controlled by the vehicle's infotainment system corresponding to each vehicle model. This allows the vehicle to enter insulation testing mode with a single button press, meeting the insulation testing needs of various vehicle models without incurring substantial testing costs.

[0035] In some embodiments of this application, the step of causing the battery management controller to control the vehicle to enter the insulation detection condition includes: The battery management controller is controlled to respond to the vehicle's safe-scale activation command and determine the corresponding DC charging start logic for the vehicle. The battery management controller is controlled to connect the high-voltage circuit of the vehicle according to the DC charging start logic, and the insulation detection function of the battery management controller is turned off, so that the vehicle enters the insulation detection condition.

[0036] The vehicle's infotainment system sends a safety-scale activation command to the battery management controller (BMD), which then responds to the command and determines the corresponding DC charging startup logic. This DC charging startup logic comprises the software control logic and hardware coordination mechanism during DC charging, instructing the vehicle on the sequence of actions from activating DC charging to the stable start of the charging process. It helps prevent safety risks caused by abnormal charging operations. Different vehicle models may have variations in BMS software strategies, safety mechanisms, and battery characteristics; therefore, the DC charging startup logic may differ between vehicle models.

[0037] After determining the DC charging start logic, the Battery Management Controller (BMS) can connect the vehicle's high-voltage circuit according to the DC charging start logic and disable the BMS's insulation detection function, thus putting the vehicle into insulation detection mode. Since the BMS's insulation detection function typically uses the bridge method, it is easily affected by parasitic capacitance and voltage fluctuations, leading to deviations in the final insulation detection results. Before the vehicle leaves the factory, testing personnel use external measuring equipment to perform insulation testing on the vehicle's high-voltage circuit to ensure the accuracy and reliability of the insulation test results, thus ensuring the safety of the vehicle. If insulation testing is performed directly without disabling the BMS's insulation detection function, the existence of two test voltages in the high-voltage circuit—one provided by the vehicle's power battery for the BMS's insulation detection function, and the other from the external testing equipment—will interfere with each other, affecting the accuracy of the insulation detection results. Through the above implementation process, without spending a lot of time, manpower and money on vehicle model identification and adaptation development for external testing equipment, the battery management controller can be activated in a safe manner to determine the DC charging start logic of the corresponding vehicle. This enables state control for different vehicle models, safely connecting the vehicle's high-voltage circuit and turning off the battery management controller's insulation detection function according to the DC charging start logic, thus adjusting the vehicle state to the optimal state for insulation detection.

[0038] In some embodiments of this application, controlling the battery management controller to connect the high-voltage circuit of the vehicle according to the DC charging start logic includes: The battery management controller determines the relays on the high-voltage circuit and their connection sequence according to the DC charging start logic. The battery management controller is controlled to close the relays sequentially according to the connection order.

[0039] The vehicle's infotainment system can control the battery management controller (BMS) to determine the vehicle's DC charging startup logic. Based on this logic, the BMS determines the relays on the high-voltage circuit and their connection sequence. The BMS then controls the BMS to sequentially close the relays in the high-voltage circuit according to this sequence. Different vehicle models may have different high-voltage circuit designs, and the positions and numbers of relays on the high-voltage circuit may also vary. Through this process, the BMS can effectively locate the positions of each relay on the high-voltage circuit and determine the connection sequence for DC charging, without incurring significant time, manpower, and financial costs for developing vehicle-specific testing equipment. Since the DC charging startup logic is already integrated into the BMS control logic during development, this process is applicable to various vehicle models. By sequentially closing the relays on the high-voltage circuit according to the connection sequence given by the vehicle's DC charging startup logic, the vehicle can safely enter the insulation detection state.

[0040] Reference Figure 2 This is a schematic diagram of the high-voltage circuit of an electric vehicle according to an embodiment of the vehicle insulation detection method provided in this application.

[0041] The high-voltage circuit of an electric vehicle can include a high-voltage positive circuit and a high-voltage negative circuit, connected to a DC charging socket, a high-voltage battery, and other high-voltage components. The high-voltage battery may include fuses, relays (such as...). Figure 2 The system includes relays K1, K2, K3, and K4, battery cells, and a battery management system (BMS). The BMS is connected to the relays and the vehicle's infotainment system via a low-voltage circuit, and the infotainment system provides a safety-standard trigger button. Other high-voltage components may include a drive motor, electric compressor, and PTC heater.

[0042] For example, when a tester touches the safety-scale activation button provided on the vehicle's infotainment system, the system can send a safety-scale activation command to the battery management controller. Upon receiving this command, the battery management controller determines the vehicle's corresponding DC charging startup logic. Based on this logic, it accurately locates relays K1, K2, K3, and K4 on the high-voltage circuit and determines the relay connection sequence during DC charging. Assuming the current relay connection sequence is "K3-K4-K1-K2", the battery management controller will sequentially close the high-voltage circuit relays in this order, ensuring complete connection between the high-voltage output pin on the DC charging socket and the high-voltage circuit inside the vehicle. Furthermore, the battery management controller will disable its own insulation detection function.

[0043] In some embodiments of this application, the method further includes: In response to the shutdown signal of the safety-mode trigger button, a safety-mode shutdown command for the vehicle is generated; The vehicle's safety-scale shutdown command is sent to the vehicle's battery management controller, so that the battery management controller controls the vehicle to exit the insulation detection mode.

[0044] The safety mode trigger button's deactivation signal is generated when the current safety mode has been triggered, and the vehicle's touchscreen detects the inspector touching the displayed safety mode trigger button again. The safety mode deactivation command is used to adjust the vehicle's status, causing the vehicle to exit the safety mode. The safety mode represents the optimal vehicle state for safety specification testing.

[0045] In this embodiment, if the vehicle's safety measurement trigger button has already been triggered, and the safety measurement trigger button provided by the testing personnel on the vehicle's infotainment system is detected again, the vehicle's infotainment system can respond to the safety measurement trigger button's closing signal and generate a vehicle safety measurement closing command. This command is then sent to the vehicle's battery management controller, causing the controller to exit the insulation testing condition. Through this process, the safety measurement trigger button on the vehicle's infotainment system can respond to the testing personnel's intention to exit the safety measurement process without requiring development of diagnostic communication with external testing equipment. When the safety measurement trigger button is detected to be touched again, the vehicle's infotainment system sends a vehicle safety measurement closing command to the battery management controller based on the button's closing signal, controlling the controller to promptly exit the optimal insulation testing condition. Furthermore, it eliminates the need for costly adaptation development of external testing equipment for different vehicle architectures; instead, the insulation testing condition can be internally controlled by the vehicle's infotainment system corresponding to each vehicle model. This achieves the goal of meeting the insulation testing needs of various vehicle models without incurring significant testing costs.

[0046] In some embodiments of this application, the step of causing the battery management controller to control the vehicle to exit the insulation detection condition includes: The battery management controller is controlled to respond to the vehicle's safe-scale shutdown command and determine the corresponding DC charging termination logic for the vehicle. The battery management controller is controlled to disconnect the high-voltage circuit of the vehicle according to the DC charging termination logic, and the insulation detection function of the battery management controller is activated so that the vehicle exits the insulation detection mode.

[0047] The vehicle's infotainment system sends a safety-scale shutdown command to the battery management controller (BMD), which in turn controls the BMD to respond to the command and determine the appropriate DC charging termination logic. This DC charging termination logic comprises the software control logic and hardware coordination mechanism used during DC charging. It instructs the vehicle to sequentially stop the DC charging process, preventing safety risks caused by abnormal charging operations. Different vehicle models may have variations in their BMS software strategies, safety mechanisms, and battery characteristics; therefore, the DC charging termination logic may differ between vehicle models.

[0048] After determining the DC charging termination logic, the battery management controller (BDC) can disconnect the vehicle's high-voltage circuit according to the DC charging termination logic and activate its insulation detection function to allow the vehicle to exit the insulation detection state. Through this process, without incurring significant time, manpower, and financial costs for developing vehicle model identification and adaptation for external testing equipment, the BDC responds to a safe, phased shutdown to determine the corresponding vehicle's DC charging termination logic. This enables state control for different vehicle models, safely connecting the vehicle's high-voltage circuit according to the DC charging termination logic and reactivating the BDC's insulation detection function. After the vehicle exits the insulation detection state, the BDC's insulation detection function continuously monitors the vehicle's insulation performance in real time to ensure vehicle safety.

[0049] In some embodiments of this application, controlling the battery management controller to disconnect the high-voltage circuit of the vehicle according to the DC charging termination logic includes: The battery management controller determines the relays on the high-voltage circuit and the disconnection sequence of the relays on the high-voltage circuit according to the DC charging termination logic; The battery management controller is controlled to disconnect the relays sequentially according to the disconnection order.

[0050] The vehicle-mounted system can control the battery management controller (BMS) to determine the DC charging termination logic of the vehicle. Based on this logic, it determines the relays on the high-voltage circuit and their disconnection sequence. The BMS then controls the BMS to disconnect the relays in the correct sequence. Different vehicle models may have different high-voltage circuit designs, and the positions and numbers of relays on the high-voltage circuit may vary. Through this process, the BMS can effectively locate the positions of each relay on the high-voltage circuit and determine the disconnection sequence when DC charging is to be terminated, without incurring significant time, manpower, or financial costs for developing vehicle model identification and adaptation for external testing equipment. Since the DC charging termination logic is already integrated into the BMS control logic during development, this process is applicable to various vehicle models. By disconnecting the relays on the high-voltage circuit sequentially according to the disconnection sequence given by the DC charging termination logic of the corresponding vehicle model, the vehicle can safely exit the insulation detection condition.

[0051] Reference Figure 2This is a schematic diagram of the high-voltage circuit of an electric vehicle according to an embodiment of the vehicle insulation detection method provided in this application. For example, when the vehicle's safety mode has been triggered and the testing personnel touch the safety mode trigger button provided on the vehicle's infotainment system again, the vehicle's infotainment system can send a safety mode shutdown command to the battery management controller. After receiving the safety mode shutdown command, the battery management controller can determine the corresponding DC charging termination logic of the vehicle, and then determine the relays K1, K2, K3, and K4 located on the high-voltage circuit according to the vehicle's DC charging termination logic, and determine the relay disconnection sequence during DC charging. Assuming the current relay disconnection sequence of the vehicle is "K1-K2-K3-K4", the battery management controller will disconnect the relays in the high-voltage circuit in this order, so that the high-voltage output pin on the DC charging socket is no longer connected to the high-voltage circuit inside the vehicle. Furthermore, the battery management controller will reactivate its own insulation detection function, restoring its insulation detection of the vehicle's high-voltage circuit.

[0052] Reference Figure 3 This is a schematic diagram of an external testing device for a vehicle insulation testing method provided in one embodiment of this application. In some embodiments of this application, the external testing device is connected to the vehicle; the external testing device is used to output a testing voltage to the high-voltage circuit of the vehicle in response to an insulation testing start signal triggered by a specified object after the generation of insulation testing start information, determine the insulation resistance value of the high-voltage circuit based on the testing voltage, and determine the insulation testing result of the vehicle based on the insulation resistance value.

[0053] In this embodiment, the external testing device may include a testing probe and a testing unit, which are connected via a high-voltage positive circuit, a high-voltage negative circuit, and a grounding wire. The testing probe is used to connect to the vehicle's DC charging socket, and the testing unit includes at least a resistor meter and a control unit. The resistor meter in the testing unit is used to measure the insulation resistance of the vehicle, and the control unit in the testing unit is used to control the initiation and termination of the insulation testing. The external testing device can be connected to the vehicle via the testing probe; specifically, the external testing device is connected to the vehicle's DC charging socket via the testing probe.

[0054] After the vehicle's infotainment system generates insulation detection start information, external testing equipment can respond to the insulation detection start signal triggered by a designated object, outputting a detection voltage to the vehicle's high-voltage circuit and measuring the corresponding leakage current flowing under that voltage. Based on Ohm's law, the insulation resistance value of the high-voltage circuit is determined using the detection voltage and leakage current. The insulation resistance value is a core indicator reflecting the circuit's insulation performance. The insulation resistance value determines the vehicle's insulation test result. If the insulation resistance value of the high-voltage circuit is less than the insulation threshold, the corresponding insulation test result is a decrease in insulation performance, indicating a potential leakage risk that could cause safety issues. The external testing equipment can provide feedback to the testing personnel through flashing indicator lights (e.g., flashing red LEDs) or displaying corresponding text. If the insulation resistance value of the high-voltage circuit is greater than or equal to the insulation threshold, the corresponding insulation test result is normal insulation performance, indicating a low leakage risk. The external testing equipment can also provide feedback to the testing personnel through flashing indicator lights (e.g., flashing green LEDs) or displaying corresponding text. The national standard GB18384-2020, "Safety Requirements for Electric Vehicles," stipulates that under maximum operating voltage, the insulation resistance of the high-voltage DC circuit of an electric vehicle (including Class B voltage DC loads such as the battery pack and motor controller) should not be less than 100 Ω / V. The insulation threshold can be set with reference to this standard, or it can be set to a value greater than 100 Ω / V according to requirements. This application does not impose specific restrictions on this.

[0055] Through the above implementation process, the insulation resistance value of the high-voltage circuit of the vehicle entering the insulation testing condition can be controlled by external measuring equipment. This allows the external equipment to measure the insulation resistance of the high-voltage circuit on various vehicle models without the need for the development of OBD diagnostic communication functions or vehicle model recognition and adaptation functions, thereby accurately determining the insulation test results of the vehicle.

[0056] For example, the designated object can be a testing personnel, and the control unit can be a control button on an external testing device used to control the start and stop of insulation testing. This control button can be a soft button or a physical button; this application does not impose specific limitations on this. After receiving the insulation testing start information generated by the vehicle-mounted terminal, the testing personnel can manually press the control button on the external testing device to trigger the insulation testing start signal. For example, the designated object can also be the control unit on the external testing device, which triggers the insulation testing start signal after receiving the insulation testing start information generated by the vehicle-mounted terminal. For example, the designated object can also be other intelligent devices connected to the external testing device, which send corresponding instructions to the external testing device to trigger the insulation testing start signal after receiving the insulation testing start information generated by the vehicle-mounted terminal.

[0057] For example, the testing head of the external testing equipment can be a general-purpose DC charging gun, and then the positive and negative voltage output terminals and the ground pin of the DC charging gun are connected to the internal components of the testing equipment. (Refer to...) Figure 4 This is a schematic diagram of a testing head for a vehicle insulation testing method according to an embodiment of this application. The testing head may include a CC1 pin, a CC2 pin, an S- pin, an S+ pin, a DC- pin, a DC+ pin, an A- pin, an A+ pin, and a PE pin. Specifically, the CC1 and CC2 pins are connection confirmation pins, used to detect the physical connection status between the testing head and the interface; the S- and S+ pins are CAN communication lines used to transmit interactive commands; the DC- and DC+ pins are the negative and positive output terminals of a high-voltage DC power supply, respectively, used to transmit test voltage; the A- and A+ pins are the negative and positive output terminals of a low-voltage DC power supply, respectively, used to supply power to the vehicle's BMS and other control systems when the vehicle's high-voltage system is not powered on; and the PE pin is a protective grounding pin, used to provide safety protection and reduce the risk of electric shock. The DC-, DC+, and PE pins are internally connected to the testing equipment, while the remaining pins can be connected or disconnected according to actual needs; this application does not impose specific limitations on this. When the testing device tests the insulation resistance of the vehicle's high-voltage circuit, it actually measures the resistance between the DC+ pin and the PE pin, and the resistance between the DC- pin and the PE pin.

[0058] Reference Figure 5 This is a schematic diagram of the detection connection of a vehicle insulation detection method provided in an embodiment of this application.

[0059] When performing insulation testing on a vehicle in factory mode, the test probe of an external testing device can be connected to the vehicle's DC charging socket.

[0060] Inspectors can use the safety mode trigger button provided on the vehicle's infotainment system to put the vehicle into safety mode with a single click.

[0061] After the testing personnel touch the safety-scale trigger button provided on the vehicle's infotainment system, the system can generate a safety-scale activation command and send the command to the battery management controller. After receiving the safety-scale activation command, the battery management controller can determine the DC charging start logic corresponding to the vehicle. Then, based on the DC charging start logic of the vehicle, it can accurately locate each relay on the high-voltage circuit of the vehicle (including relays K1, K2, K3, and K4 in the high-voltage battery) and the connection sequence of the relays on the high-voltage circuit when the vehicle is DC charging. Subsequently, the battery management controller can close the relays on the high-voltage circuit in sequence according to the determined connection sequence, so that the high-voltage output pin on the DC charging socket is fully connected to the high-voltage circuit in the vehicle, and disable the insulation detection function of the battery management controller itself. After the battery management controller completes the high-voltage circuit connection and the insulation detection function is disabled, the vehicle enters the insulation detection condition suitable for insulation base detection. After the vehicle enters the insulation testing mode, the vehicle terminal can generate insulation testing start information and display it on the in-vehicle display screen or the mobile terminal of the testing personnel, prompting the testing personnel to start the external testing equipment to perform insulation testing on the vehicle. After seeing the insulation test start information, the tester can control the external test equipment to start the insulation test of the vehicle's high-voltage circuit through the control unit on the external test equipment. External testing equipment can respond to the insulation test start signal triggered by the testing personnel, output a test voltage to the high-voltage circuit of the vehicle, and after a certain period of polarization, determine the insulation resistance value on the high-voltage circuit of the vehicle by measuring the leakage current. If the insulation resistance value is greater than or equal to the insulation threshold, the insulation test result of the vehicle is determined to be normal insulation performance. If the insulation resistance value is less than the insulation threshold, the insulation test result of the vehicle is determined to be insulation performance degradation and a corresponding alarm prompt is output.

[0062] It should be noted that the vehicle insulation testing method provided in this application embodiment can be executed by a vehicle insulation testing device, or a control module within the vehicle insulation testing device for executing the loading vehicle insulation testing method. This application embodiment uses the execution of the loading vehicle insulation testing method by a vehicle insulation testing device as an example to illustrate the vehicle insulation testing method provided in this application embodiment.

[0063] Based on the above method embodiments, this embodiment also provides a vehicle insulation detection device applied to the vehicle terminal, wherein the vehicle terminal is provided with an safety-scale type trigger button and is connected to the battery management controller.

[0064] Reference Figure 6 This is a structural block diagram of a vehicle insulation testing device provided in an embodiment of this application. The device includes: Safety-type activation command generation module 601 is used to generate a safety-type activation command for the vehicle in response to the trigger signal of the safety-type trigger button. An safety-scale activation command sending module 602 is used to send the safety-scale activation command of the vehicle to the battery management controller of the vehicle, so that the battery management controller controls the vehicle to enter the insulation detection mode; the insulation detection mode is that the DC charging socket pin of the vehicle is connected to the high voltage circuit of the vehicle, and the insulation detection function of the battery management controller is turned off. The insulation test start information generation module 603 is used to generate insulation test start information and send it to a designated object after the vehicle enters the insulation test condition, so as to prompt the designated object to start the external testing equipment to perform insulation test on the vehicle.

[0065] The standardized activation instruction sending module 602 is further used for: The battery management controller is controlled to respond to the vehicle's safe-scale activation command and determine the corresponding DC charging start logic for the vehicle. The battery management controller is controlled to connect the high-voltage circuit of the vehicle according to the DC charging start logic, and the insulation detection function of the battery management controller is turned off, so that the vehicle enters the insulation detection condition.

[0066] The standardized activation instruction sending module 602 is also used for: The battery management controller determines the relays on the high-voltage circuit and their connection sequence according to the DC charging start logic. The battery management controller is controlled to close the relays sequentially according to the connection order.

[0067] The vehicle insulation detection device also includes: The vehicle safety-mode shutdown command generation module is used to generate the vehicle safety-mode shutdown command in response to the shutdown signal of the safety-mode trigger button. An automated shutdown command sending module is used to send the vehicle's automated shutdown command to the vehicle's battery management controller, so that the battery management controller can control the vehicle to exit the insulation detection mode.

[0068] The secure-scale shutdown command sending module is further used for: The battery management controller is controlled to respond to the vehicle's safe-scale shutdown command and determine the corresponding DC charging termination logic for the vehicle. The battery management controller is controlled to disconnect the high-voltage circuit of the vehicle according to the DC charging termination logic, and the insulation detection function of the battery management controller is activated so that the vehicle exits the insulation detection mode.

[0069] The secure-scale shutdown command sending module is also used for: The battery management controller determines the relays on the high-voltage circuit and the disconnection sequence of the relays on the high-voltage circuit according to the DC charging termination logic; The battery management controller is controlled to disconnect the relays sequentially according to the disconnection order.

[0070] Optionally, the external detection device is connected to the vehicle; the external detection device is used to output a detection voltage to the high-voltage circuit of the vehicle in response to an insulation detection start signal triggered by a specified object after the insulation detection start information is generated, determine the insulation resistance value of the high-voltage circuit based on the detection voltage, and determine the insulation detection result of the vehicle based on the insulation resistance value.

[0071] The vehicle insulation detection device in this application embodiment can be a device, or a component, integrated circuit, or chip in a terminal. The device can be a mobile electronic device or a non-mobile electronic device. For example, mobile electronic devices can be mobile phones, tablets, laptops, PDAs, in-vehicle electronic devices, wearable devices, ultra-mobile personal computers (UMPCs), netbooks, or personal digital assistants (PDAs), etc., while non-mobile electronic devices can be servers, network attached storage (NAS), personal computers (PCs), televisions (TVs), ATMs, or self-service machines, etc. This application embodiment does not impose specific limitations.

[0072] The vehicle insulation detection device in this application embodiment can be a device with an operating system. This operating system can be Android, iOS, or other possible operating systems; this application embodiment does not specifically limit it.

[0073] The vehicle insulation detection device provided in this application embodiment can achieve... Figures 1 to 5 The various processes implemented by the vehicle insulation detection device in the method embodiment will not be described again here to avoid repetition.

[0074] The vehicle insulation detection device provided in this application embodiment can generate a vehicle insulation activation command in response to the trigger signal of the safety-scale trigger button provided on the vehicle's terminal after the testing personnel touches the button. The vehicle insulation activation command is then sent to the vehicle's battery management controller, causing the battery management controller to control the vehicle to enter the insulation detection mode. The insulation detection mode is characterized by the DC charging socket pins of the vehicle being connected to the vehicle's high-voltage circuit, and the insulation detection function of the battery management controller being turned off. After the vehicle enters the insulation detection mode, the terminal can also generate insulation detection start information and send it to a designated object, prompting the designated object to activate external testing equipment to perform insulation testing on the vehicle. Through the above implementation process, a safety-scale trigger button is set up on the vehicle's infotainment system. There's no need to develop diagnostic communication for external testing equipment. The vehicle's infotainment system sends a safety-scale activation command to the battery management controller based on the trigger signal from the safety-scale trigger button. This controls the battery management controller to put the vehicle in the most suitable condition for insulation testing, and then notifies the designated object to activate the external testing equipment to perform insulation testing. For different vehicle architectures, there's no need to spend significant resources developing adaptations for external testing equipment for different models. Instead, the insulation testing condition can be internally controlled by the vehicle's infotainment system corresponding to each vehicle model. This allows the vehicle to enter insulation testing mode with a single button press, meeting the insulation testing needs of various vehicle models without incurring substantial testing costs.

[0075] Optionally, this application also provides an electronic device, including a processor, a memory, and a program or instructions stored in the memory and executable on the processor. When the program or instructions are executed by the processor, they implement the various processes of the above-described vehicle insulation detection method embodiments and achieve the same technical effects. To avoid repetition, they will not be described again here.

[0076] It should be noted that the electronic devices in the embodiments of this application include the mobile electronic devices and non-mobile electronic devices described above.

[0077] The bus mentioned in the above terminal can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used to represent it in the diagram, but this does not mean that there is only one bus or one type of bus.

[0078] The memory may include random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0079] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0080] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described vehicle insulation detection method embodiments and achieve the same technical effects. To avoid repetition, they will not be described again here.

[0081] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0082] This application also provides a vehicle, which includes electronic equipment capable of implementing the various processes of the above-described vehicle insulation detection method embodiments and achieving the same technical effect. To avoid repetition, it will not be described again here.

[0083] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0084] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0085] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A method for testing the insulation of a vehicle, characterized in that, Applied to an in-vehicle infotainment system, the in-vehicle infotainment system provides a safety-scale type trigger button, and the in-vehicle infotainment system is connected to a battery management controller; the method includes: In response to the trigger signal of the safety-mode trigger button, a safety-mode activation command for the vehicle is generated; The vehicle's safety-scale activation command is sent to the vehicle's battery management controller, so that the battery management controller controls the vehicle to enter the insulation detection mode; the insulation detection mode is when the DC charging socket pin of the vehicle is connected to the high-voltage circuit of the vehicle, and the insulation detection function of the battery management controller is turned off. After the vehicle enters the insulation testing condition, insulation testing start information is generated and sent to a designated object to prompt the designated object to start external testing equipment to perform insulation testing on the vehicle.

2. The method according to claim 1, characterized in that, The step of having the battery management controller control the vehicle to enter the insulation detection mode includes: The battery management controller is controlled to respond to the vehicle's safe-scale activation command and determine the corresponding DC charging start logic for the vehicle. The battery management controller is controlled to connect the high-voltage circuit of the vehicle according to the DC charging start logic, and the insulation detection function of the battery management controller is turned off, so that the vehicle enters the insulation detection condition.

3. The method according to claim 2, characterized in that, The control of the battery management controller to connect the high-voltage circuit of the vehicle according to the DC charging start logic includes: The battery management controller determines the relays on the high-voltage circuit and their connection sequence according to the DC charging start logic. The battery management controller is controlled to close the relays sequentially according to the connection order.

4. The method according to claim 1, characterized in that, The method further includes: In response to the shutdown signal of the safety-mode trigger button, a safety-mode shutdown command for the vehicle is generated; The vehicle's safety-scale shutdown command is sent to the vehicle's battery management controller, so that the battery management controller controls the vehicle to exit the insulation detection mode.

5. The method according to claim 4, characterized in that, The step of having the battery management controller control the vehicle to exit the insulation detection mode includes: The battery management controller is controlled to respond to the vehicle's safe-scale shutdown command and determine the corresponding DC charging termination logic for the vehicle. The battery management controller is controlled to disconnect the high-voltage circuit of the vehicle according to the DC charging termination logic, and the insulation detection function of the battery management controller is activated so that the vehicle exits the insulation detection mode.

6. The method according to claim 5, characterized in that, The control of the battery management controller to disconnect the high-voltage circuit of the vehicle according to the DC charging termination logic includes: The battery management controller determines the relays on the high-voltage circuit and the disconnection sequence of the relays on the high-voltage circuit according to the DC charging termination logic; The battery management controller is controlled to disconnect the relays sequentially according to the disconnection order.

7. The method according to claim 1, characterized in that, The external detection device is connected to the vehicle; the external detection device is used to output a detection voltage to the high-voltage circuit of the vehicle in response to an insulation detection start signal triggered by a specified object after the insulation detection start information is generated, determine the insulation resistance value of the high-voltage circuit based on the detection voltage, and determine the insulation detection result of the vehicle based on the insulation resistance value.

8. A vehicle insulation testing device, characterized in that, Applied to an in-vehicle infotainment system, the in-vehicle infotainment system provides a safe and standardized trigger button, the in-vehicle infotainment system is connected to a battery management controller, and the device includes: An automatic activation command generation module is used to generate an automatic activation command for the vehicle in response to the trigger signal of the automatic trigger button. An automated activation command sending module is used to send the vehicle's automated activation command to the vehicle's battery management controller, so that the battery management controller controls the vehicle to enter the insulation detection mode; the insulation detection mode is when the DC charging socket pin of the vehicle is connected to the high-voltage circuit of the vehicle, and the insulation detection function of the battery management controller is turned off. An insulation test start information generation module is used to generate insulation test start information and send it to a designated object after the vehicle enters the insulation test condition, so as to prompt the designated object to start external testing equipment to perform insulation test on the vehicle.

9. An electronic device, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the vehicle insulation detection method as described in claims 1-7.

10. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the vehicle insulation detection method as described in claims 1-7.

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