Test circuit, vehicle safety detection method, device, equipment, vehicle and medium

Abstract

This disclosure proposes a test circuit, vehicle safety testing method, apparatus, equipment, vehicle, and medium. The test circuit includes an equivalent impedance module, a first switch, a second switch, a third switch, and a fourth switch. The first terminal of the equivalent impedance module is connected to the first terminals of both the first and second switches. The second terminal of the first switch serves as the first measurement terminal of the test circuit, and the second terminal of the second switch is connected to a ground terminal. The second terminal of the equivalent impedance module is connected to the first terminals of both the third and fourth switches. The second terminal of the third switch is connected to a ground terminal, and the second terminal of the fourth switch serves as the second measurement terminal of the test circuit. This disclosure allows for flexible configuration of different electrical paths between any two of the first measurement terminal, the second measurement terminal, and the ground terminal via the first to fourth switches, improving testing efficiency, reducing manual intervention, and minimizing test deviations caused by wiring errors.

Description

Technical Field

[0001] This disclosure relates to the field of electrical testing technology, and in particular to a test circuit, a vehicle safety testing method, apparatus, equipment, vehicle, and medium. Background Technology

[0002] In the testing of electrical equipment, different tests have different requirements for the connection method between the measuring terminal and the grounding terminal. When adapting test circuits in related technologies to meet various testing needs, they usually rely on manual wiring modifications, which is not only inefficient but may also lead to inaccurate test results due to wiring errors. Summary of the Invention

[0003] A first aspect of this disclosure provides a test circuit, comprising: an equivalent impedance module, a first switch, a second switch, a third switch, and a fourth switch; wherein, The first end of the equivalent impedance module is connected to the first end of the first switch and the first end of the second switch respectively. The second end of the first switch serves as the first measurement end of the test circuit, and the second end of the second switch is connected to the ground end. The second terminal of the equivalent impedance module is connected to the first terminal of the third switch and the first terminal of the fourth switch, respectively. The second terminal of the third switch is connected to the ground terminal, and the second terminal of the fourth switch serves as the second measurement terminal of the test circuit.

[0004] A second aspect of this disclosure provides a vehicle safety testing method, wherein the vehicle's high-voltage system includes a high-voltage bus and a test circuit, a first measuring terminal of the test circuit is connected to the positive terminal of the high-voltage bus, a second measuring terminal of the test circuit is connected to the negative terminal of the high-voltage bus, and a grounding terminal of the test circuit is connected to the vehicle body ground. The method includes: In response to the vehicle meeting the set detection conditions, the equivalent impedance module in the test circuit is controlled to be connected sequentially between any two of the positive terminal of the high voltage bus, the negative terminal of the high voltage bus, and the vehicle ground, and the corresponding contact current flowing through the equivalent impedance module is obtained. The electrical safety status of the vehicle is determined based on the corresponding contact current.

[0005] A third aspect of this disclosure provides a vehicle safety testing device. The high-voltage system of the vehicle includes a high-voltage bus and a test circuit. A first measuring terminal of the test circuit is connected to the positive terminal of the high-voltage bus, a second measuring terminal of the test circuit is connected to the negative terminal of the high-voltage bus, and a grounding terminal of the test circuit is connected to the vehicle body ground. The device includes: The control module is used to control the equivalent impedance module in the test circuit to be connected sequentially between any two of the positive terminal of the high voltage bus, the negative terminal of the high voltage bus, and the vehicle ground in response to the vehicle meeting the set detection conditions, and to obtain the corresponding contact current flowing through the equivalent impedance module. The determination module is used to determine the electrical safety status of the vehicle based on the corresponding contact current.

[0006] A fourth aspect of this disclosure provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the method described above.

[0007] The fifth aspect of this disclosure provides a vehicle whose high-voltage system includes a high-voltage bus and a test circuit. A first measuring terminal of the test circuit is connected to the positive terminal of the high-voltage bus, a second measuring terminal of the test circuit is connected to the negative terminal of the high-voltage bus, and a grounding terminal of the test circuit is connected to the vehicle body ground. The vehicle further includes: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to implement the above-described method.

[0008] A sixth aspect of this disclosure provides a non-transitory computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, implement the method described above.

[0009] The present disclosure discloses a test circuit, vehicle safety testing method, apparatus, equipment, vehicle, and medium. The test circuit includes an equivalent impedance module, a first switch, a second switch, a third switch, and a fourth switch. A first terminal of the equivalent impedance module is connected to a first terminal of both the first and second switches. The second terminal of the first switch serves as a first measurement terminal of the test circuit, and the second terminal of the second switch is connected to a ground terminal. A second terminal of the equivalent impedance module is connected to a first terminal of both the third and fourth switches. The second terminal of the third switch is connected to a ground terminal, and the second terminal of the fourth switch serves as a second measurement terminal of the test circuit. By configuring the connection relationships between the first to fourth switches and the equivalent impedance module, the test circuit can flexibly configure different electrical paths between any two of the first measurement terminal, the second measurement terminal, and the ground terminal. This allows for switching to different connection modes required for different tests by controlling the on / off states of the first to fourth switches, thereby improving testing efficiency, reducing manual intervention, and minimizing test deviations caused by wiring errors.

[0010] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0011] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 A circuit diagram of a test circuit provided in one embodiment of this disclosure; Figure 2 A circuit diagram of an application test circuit provided in one embodiment of this disclosure; Figure 3 This is a flowchart of a vehicle safety detection method provided in one embodiment of the present disclosure; Figure 4 A flowchart of a vehicle safety detection method provided in another embodiment of this disclosure; Figure 5 A flowchart of active discharge provided in one embodiment of this disclosure; Figure 6 A block diagram of a vehicle safety detection device provided in one embodiment of this disclosure; Figure 7 This is a schematic diagram of the structure of an electronic device provided in one embodiment of the present disclosure; Figure 8 This is a schematic diagram of the structure of a vehicle provided in one embodiment of the present disclosure. Detailed Implementation

[0012] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0013] The following description, with reference to the accompanying drawings, describes test circuits, vehicle safety testing methods, apparatus, devices, vehicles, and media according to embodiments of the present disclosure.

[0014] Figure 1 This is a circuit diagram of a test circuit provided in one embodiment of the present disclosure.

[0015] like Figure 1 As shown, the test circuit of this embodiment includes: an equivalent impedance module 100, a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4.

[0016] The first end of the equivalent impedance module 100 is connected to the first end of the first switch K1 and the first end of the second switch K2, respectively. The second end of the first switch K1 serves as the first measurement terminal T1 of the test circuit, and the second end of the second switch K2 is connected to the ground terminal GND. The second end of the equivalent impedance module 100 is connected to the first end of the third switch K3 and the first end of the fourth switch K4, respectively. The second end of the third switch K3 is connected to the ground terminal GND, and the second end of the fourth switch K4 serves as the second measurement terminal T2 of the test circuit.

[0017] For example, the test circuit can be used for electrical testing of vehicle high-voltage systems, as well as for electrical testing of household appliances, industrial equipment, charging piles, energy storage systems, or medical electrical equipment.

[0018] The test circuit disclosed herein adds a first switch K1 to a fourth switch K4, and sets the connection relationships between the first switch K1 to the fourth switch K4 and the equivalent impedance module 100, respectively. This allows the test circuit to flexibly configure different electrical paths between any two of the first measurement terminal T1, the second measurement terminal T2, and the ground terminal GND. By controlling the on / off states of the first switch K1 to the fourth switch K4, this disclosure can switch to a connection mode suitable for different tests, thereby improving test efficiency, reducing manual intervention, and reducing test deviations caused by wiring errors.

[0019] In some embodiments of this disclosure, such as Figure 2 As shown, the first measuring terminal T1 is connected to the positive terminal of the vehicle's high-voltage bus, the second measuring terminal T2 is connected to the negative terminal of the high-voltage bus, and the grounding terminal GND is connected to the vehicle's ground; wherein, When both the first switch K1 and the fourth switch K4 are closed and both the second switch K2 and the third switch K3 are open, the equivalent impedance module 100 is connected between the positive and negative terminals of the high-voltage bus to simulate the first scenario where a human body is simultaneously in contact with both the positive and negative terminals of the high-voltage bus. With the second switch K2 and the fourth switch K4 both closed and the first switch K1 and the third switch K3 both open, the equivalent impedance module 100 is connected between the negative terminal of the high-voltage bus and the vehicle ground to simulate the second scenario where a human body is simultaneously in contact with the negative terminal of the high-voltage bus and the vehicle ground. With the first switch K1 and the third switch K3 both closed and the second switch K2 and the fourth switch K4 both open, the equivalent impedance module 100 is connected between the positive terminal of the high-voltage bus and the vehicle ground to simulate the third scenario where a human body is simultaneously in contact with the positive terminal of the high-voltage bus and the vehicle ground.

[0020] In some embodiments of this disclosure, such as Figure 1 and Figure 2 As shown, the equivalent impedance module 100 includes: a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, and a second capacitor C2.

[0021] Wherein, the first end of the first resistor R1 and the first end of the first capacitor C1 are connected to form a first node, and the first node is connected to the first end of the first switch K1 and the first end of the second switch K2 respectively; the second end of the first resistor R1 and the second end of the first capacitor C1 are connected to form a second node, and the second node is connected to the first end of the second resistor R2 and the first end of the third resistor R3 respectively, and the second end of the third resistor R3 is connected to the first end of the second capacitor C2; the second end of the second resistor R2 and the second end of the second capacitor C2 are connected to form a third node, and the third node is connected to the first end of the third switch K3 and the first end of the fourth switch K4 respectively; wherein, the first resistor R1 and the second resistor R2 together constitute the human body equivalent resistance.

[0022] In one embodiment of this disclosure, since the voltage U1 across the second resistor R2 fluctuates significantly and has poor stability during measurement, and the test is performed under open-circuit conditions, the voltage U2 across the second capacitor C2 is approximately equal to the voltage U1 across the second resistor R2. Furthermore, the voltage U2 across the second capacitor C2 exhibits good stability. Therefore, the voltage U1 across the second resistor R2 can be indirectly obtained by measuring the voltage U2 across the second capacitor C2. Thus, in any of the first, second, and third scenarios, the corresponding contact current flowing through the equivalent impedance module 100 is determined based on the voltage value across the second capacitor C2 and the resistance value of the second resistor R2.

[0023] In one embodiment of this disclosure, such as Figure 1 and Figure 2 As shown, the equivalent impedance module 100 further includes a fourth resistor R4. The first end of the fourth resistor R4 is connected to the first measurement terminal T1, and the second end of the fourth resistor R4 is connected to the second measurement terminal T2.

[0024] In one embodiment of this disclosure, such as Figure 2 As shown, the first measuring terminal T1 is connected to the positive terminal of the high-voltage busbar of the vehicle, and the second measuring terminal T2 is connected to the negative terminal of the high-voltage busbar. When the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 are all open, the fourth resistor R4 is connected between the positive and negative terminals of the high-voltage busbar. The open-circuit voltage of the high-voltage busbar is determined based on the measured voltage and resistance value across the fourth resistor R4. The voltage across the fourth resistor R4 can be measured by a voltage sampling unit. The voltage sampling unit may include at least one of a resistor divider circuit, a differential amplifier, an isolated voltage sensor, a Hall effect voltage sensor, or an analog-to-digital converter.

[0025] The open-circuit voltage in this embodiment can be used to preliminarily determine whether there is residual potential on the high-voltage bus. However, even a high open-circuit voltage does not necessarily indicate a risk of electric shock. It is necessary to combine this with the vehicle safety testing method of this embodiment, by connecting an equivalent impedance and measuring the corresponding contact current, to comprehensively assess the actual electrical safety status of the vehicle. This assessment result can provide a basis for emergency rescue scenarios, such as guiding rescue personnel to select appropriate protection levels, thereby improving rescue efficiency while ensuring personal safety.

[0026] In one embodiment of this disclosure, such as Figure 2 As shown, the high-voltage system of this embodiment further includes a first semiconductor switch SSR1, a second semiconductor switch SSR2, a power battery Bat, a bus capacitor Cm, and a discharge switch K. The first semiconductor switch SSR1 is connected between the positive terminal of the high-voltage bus and the positive terminal of the power battery Bat; the second semiconductor switch SSR2 is connected between the negative terminal of the high-voltage bus and the negative terminal of the power battery Bat; the bus capacitor Cm is connected between the positive and negative terminals of the high-voltage bus; and the discharge switch K is connected between the positive terminal of the power battery Bat and the negative terminal of the high-voltage bus. Both the first semiconductor switch SSR1 and the second semiconductor switch SSR2 are solid-state relays or electronic switches composed of power semiconductor devices such as MOSFETs and IGBTs.

[0027] In one embodiment of this disclosure, such as Figure 2 As shown, the high-voltage system of this embodiment further includes a measuring resistor shunt and a fuse, which are connected in series between the first semiconductor switch SSR1 and the positive terminal of the power battery. The measuring resistor shunt is used to measure the current flowing through the high-voltage bus, and the fuse is used to disconnect the circuit in the event of a short circuit or severe overcurrent fault, providing hardware-level overcurrent protection to prevent device damage or thermal runaway risks.

[0028] Taking the application of the test circuit to the high-voltage system of a vehicle as an example, the vehicle safety test method of this disclosure embodiment will be described.

[0029] Figure 3 This is a flowchart of a vehicle safety testing method provided in one embodiment of the present disclosure.

[0030] It should be noted that the vehicle safety testing method of this disclosure embodiment can be executed by a vehicle safety testing device, which can be integrated into an electronic device, such as a vehicle controller, a battery management system, or a dedicated testing device. The electronic device includes, but is not limited to, a vehicle.

[0031] like Figure 3 As shown, the vehicle safety testing method of this disclosure includes the following steps: S301, in response to the vehicle meeting the set detection conditions, controls the equivalent impedance module in the test circuit to be connected sequentially between any two of the high voltage bus positive terminal, high voltage bus negative terminal and vehicle ground, and obtains the corresponding contact current flowing through the equivalent impedance module.

[0032] For example, when the vehicle meets the set detection conditions (such as the high-voltage system completing the high-voltage operation), the first switch K1 and the fourth switch K4 can be closed and the second switch K2 and the third switch K3 can be opened, so that the equivalent impedance module is connected between the positive and negative terminals of the high-voltage bus, simulating the scenario of a human body simultaneously contacting the positive and negative terminals of the high-voltage bus. After a stable set time Ts, the first voltage U2_1 across the second capacitor C2 is read, and the first contact current I1 flowing through the equivalent impedance module is determined based on the first voltage U2_1 and the resistance value of the second resistor R2, where I1 = U2_1 / R2. Then, control the second switch K2 and the fourth switch K4 to be closed and the first switch K1 and the third switch K3 to be open, so that the equivalent impedance module is connected between the negative terminal of the high voltage bus and the vehicle ground, simulating the scenario of a human body simultaneously contacting the negative terminal of the high voltage bus and the vehicle ground. After a stable set time Ts, read the second voltage U2_2 across the second capacitor C2. Determine the second contact current I2 flowing through the equivalent impedance module based on the second voltage U2_2 and the resistance value of the second resistor R2, I2=U2_2 / R2. Finally, control the first switch K1 and the third switch K3 to be closed and the second switch K2 and the fourth switch K4 to be open, so that the equivalent impedance module is connected between the positive terminal of the high voltage bus and the vehicle ground, simulating the scenario of a human body simultaneously contacting the positive terminal of the high voltage bus and the vehicle ground. After a stable set time Ts, read the third voltage U2_3 across the second capacitor C2. Based on the third voltage U2_3 and the resistance value of the second resistor R2, determine the third contact current I3 flowing through the equivalent impedance module, I3=U2_3 / R2.

[0033] It should be noted that the above only describes the sequence of controlling the first switch K1 and the fourth switch K4 to be closed while the second switch K2 and the third switch K3 are both open; then controlling the second switch K2 and the fourth switch K4 to be closed while the first switch K1 and the third switch K3 are both open; and finally controlling the first switch K1 and the third switch K3 to be closed while the second switch K2 and the fourth switch K4 are both open. Of course, other control sequences of switch actions can be used according to actual testing or calibration requirements, which will not be elaborated here.

[0034] S302, determine the vehicle's electrical safety status based on the corresponding contact current.

[0035] For example, after obtaining the first contact current I1, the second contact current I2, and the third contact current I3, the electrical safety status of the vehicle is determined based on these three currents. For instance, the maximum contact current among the three currents is determined as the target contact current I, and the vehicle's electrical safety status is determined based on the target contact current I, resulting in the output of corresponding safety warning information.

[0036] Therefore, this disclosure controls the on / off states of the first switch K1 to the fourth switch K4 in the test circuit to connect the equivalent impedance module sequentially between the positive and negative terminals of the high-voltage bus, between the negative terminal of the high-voltage bus and the vehicle ground, and between the positive terminal of the high-voltage bus and the vehicle ground. After each connection state is stable, the voltage across the corresponding second capacitor C2 is measured, and the corresponding contact current is determined based on the voltage across the second capacitor C2, thereby comprehensively evaluating the electrical safety status of the vehicle under multiple contact paths.

[0037] In some embodiments of this disclosure, if the target contact current I is less than or equal to a first set current threshold (e.g., 1mA), the electrical safety status is determined to be a first safety level, and a first safety prompt message is output in the form of light and / or voice, wherein the first safety prompt message is a normal status indication, for example, controlling the green light in the instrument panel to light up; If the target contact current I is greater than the first set current threshold and the target contact current I is less than or equal to the second set current threshold (e.g., 3.5mA), then the electrical safety status level is determined to be the second safety level, and the second safety warning information is output in the form of light and / or voice. The safety of the second safety level is lower than that of the first safety level, and the second safety warning information is a warning indication, such as illuminating the yellow light in the control panel. In response to the target contact current I being greater than the second set current threshold, the electrical safety status level is determined to be dangerous, and a third safety warning message is output in the form of light and / or voice, wherein the third safety warning message is a fault alarm indication, for example, the red light in the control panel is illuminated.

[0038] Therefore, this disclosure compares the maximum value among the measured multiple contact currents with preset multi-level current thresholds to automatically determine the electrical risk level and output corresponding status indication signals (such as green light, yellow light, or red light), thereby realizing the graded assessment and visual prompts of electrical safety status.

[0039] In some embodiments of this disclosure, after obtaining the second contact current I2, the insulation status of the high-voltage bus negative terminal to the vehicle ground is determined based on the second contact current I2. For example, if the second contact current I2 is greater than a second set current threshold, it is determined that the insulation of the high-voltage bus negative terminal to the vehicle ground has failed; if the second contact current I2 is less than or equal to the second set current threshold, it is determined that the insulation of the high-voltage bus negative terminal to the vehicle ground has not failed.

[0040] In some embodiments of this disclosure, after obtaining the third contact current I3, the insulation status of the high-voltage bus positive terminal to the vehicle ground is determined based on the third contact current I3. For example, if the third contact current I3 is greater than a second set current threshold, it is determined that the insulation of the high-voltage bus positive terminal to the vehicle ground has failed; if the third contact current I3 is less than or equal to the second set current threshold, it is determined that the insulation of the high-voltage bus positive terminal to the vehicle ground has not failed.

[0041] This disclosure determines the insulation status between the negative terminal of the high-voltage busbar and the vehicle body ground, and between the positive terminal of the high-voltage busbar and the vehicle body ground, respectively, based on the second contact current I2 and the third contact current I3. This enables precise location and fault identification of the insulation performance of the positive and negative terminals of the high-voltage busbar to the vehicle body. When the insulation between either terminal and ground deteriorates or fails, the corresponding alarm mechanism can be triggered in a timely manner to avoid the risk of electric shock or system downtime due to the accumulation of insulation faults. This method not only improves the resolution and diagnostic capability of insulation detection, but also provides a reliable basis for subsequent fault isolation, maintenance guidance, and active safety control, enhancing the safety and maintainability of the vehicle's high-voltage system.

[0042] Figure 4 This is a flowchart of a vehicle safety detection method provided in another embodiment of the present disclosure.

[0043] like Figure 4 As shown, the vehicle safety detection method of this disclosure includes the following steps: S401, received a request to reduce the high voltage.

[0044] S402, disconnect SSR2 and close discharge switch K to perform active discharge.

[0045] S403, active discharge complete.

[0046] S404, close K1 and K4, and after Ts stabilizes, read the first voltage U2_1.

[0047] S405, close K2 and K4, stabilize Ts, and then read the second voltage U2_2.

[0048] S406, close K1 and K3, stabilize Ts, and read the third voltage U2_3. It should be noted that steps S407 and S420 can be executed after step S406.

[0049] S407, determine the first contact current I1 = U2_1 / R2; determine the second contact current I2 = U2_2 / R2; determine the third contact current I3 = U2_3 / R2. Steps S408 and S414 can be executed after step S407.

[0050] S408, determine the target contact current I=max(I1, I2, I3).

[0051] S409, determine whether I≤1mA is true. If yes, proceed to step S410; if no, proceed to step S411.

[0052] S410, the instrument panel shows a green light.

[0053] S411, determine whether 1mA < I ≤ 3.5mA is true. If yes, proceed to step S412; if no, proceed to step S413.

[0054] S412, the instrument panel displays a yellow warning light.

[0055] S413, the instrument panel displays a red light.

[0056] S414, determine whether I2 > 3.5mA and I3 > 3.5mA are true. If yes, proceed to step S415; otherwise, proceed to step S416.

[0057] S415, double-sided insulation failure. This means that the insulation between the positive terminal of the high-voltage busbar and the vehicle body ground has failed, and the insulation between the negative terminal of the high-voltage busbar and the vehicle body ground has also failed.

[0058] S416, determine whether I2 > 3.5mA and I3 ≤ 3.5mA are true. If yes, proceed to step S417; otherwise, proceed to step S418.

[0059] S417, Negative insulation failure. That is, the insulation between the positive terminal of the high-voltage busbar and the vehicle body ground is not failed, but the insulation between the negative terminal of the high-voltage busbar and the vehicle body ground is failed.

[0060] S418, determine whether I2≤3.5mA and I3>3.5mA are true. If yes, proceed to step S419; if no, proceed to step S420.

[0061] S419, positive insulation failure. This means that the insulation between the positive terminal of the high-voltage busbar and the vehicle ground has failed, while the insulation between the negative terminal of the high-voltage busbar and the vehicle ground has not failed.

[0062] S420, bilateral insulation is not in failure. That is, the insulation between the positive terminal of the high-voltage busbar and the vehicle body ground is not in failure, and the insulation between the negative terminal of the high-voltage busbar and the vehicle body ground is not in failure.

[0063] S421, switches K1, K2, K3, and K4 are all open to obtain the open-circuit voltage.

[0064] In one embodiment of this disclosure, the vehicle meeting the set detection conditions may include having completed the active discharge of the bus capacitor. The active discharge process of the bus capacitor includes: upon receiving a high-voltage request from the vehicle, controlling the second semiconductor switch SSR2 to open; while the second semiconductor switch SSR2 is open, controlling the discharge switch K to close; and while the discharge switch K is closed, controlling the first semiconductor switch SSR1 to turn on and off with a target duty cycle to actively discharge the bus capacitor Cm. If a vehicle collision event is detected, the target duty cycle is determined to be a first set discharge duty cycle; if no vehicle collision event is detected, the target duty cycle is determined to be a second set discharge duty cycle; wherein the first set discharge duty cycle is greater than the second set discharge duty cycle.

[0065] During the active discharge of the bus capacitor Cm, if the temperature of the first semiconductor switch SSR1 is higher than the set temperature threshold, the target duty cycle is reduced, and the first semiconductor switch SSR1 is turned on and off with the reduced target duty cycle to actively discharge the bus capacitor Cm until the bus voltage of the high voltage bus is detected to drop below the set voltage threshold, then the active discharge of the bus capacitor is determined to be completed.

[0066] Therefore, this disclosure can adjust the duty cycle of SSR1 according to different discharge scenarios, and equivalently adjust the resistance value of the discharge resistor, thereby achieving dynamic control of the active discharge rate and completing the corresponding energy discharge task. At the same time, the bus voltage and the temperature of the first semiconductor switch SSR1 are monitored in real time during the discharge process. The discharge can be terminated in time when the voltage drops to the safety threshold, and the duty cycle can be automatically reduced when the temperature is too high to prevent thermal damage. This balances the discharge speed and system reliability, and effectively improves the safety, responsiveness and device durability of the vehicle high voltage system.

[0067] Figure 5 This is a flowchart of active discharge provided for one embodiment of the present disclosure.

[0068] like Figure 5 As shown, the active discharge process of this embodiment includes the following steps: S501 received a request to reduce the high voltage.

[0069] S502, after the high-voltage condition is met, disconnect SSR2.

[0070] S503, Close discharge switch K.

[0071] S504, determine whether a collision event has occurred. If yes, proceed to step S505; if no, proceed to step S507.

[0072] S505, normal discharge mode.

[0073] S506, drive SSR1 according to the first set discharge duty cycle D1.

[0074] S507, Emergency Discharge Mode.

[0075] S508 drives SSR1 according to the second set discharge duty cycle D2.

[0076] S509, determine if the temperature of SSR1 exceeds the set temperature threshold. If yes, proceed to step S510; otherwise, proceed to step S511.

[0077] S510 reduces the target duty cycle D, thereby lowering the discharge power.

[0078] S511, obtain the bus voltage V_Bus and determine whether the bus voltage V_Bus < 60V is true. If yes, proceed to step S512.

[0079] S512, active discharge complete, SSR1 disconnected.

[0080] In summary, the vehicle safety detection method of this disclosure includes a high-voltage system comprising a high-voltage bus and a test circuit. The first measuring terminal of the test circuit is connected to the positive terminal of the high-voltage bus, the second measuring terminal of the test circuit is connected to the negative terminal of the high-voltage bus, and the grounding terminal of the test circuit is connected to the vehicle ground. In response to the vehicle meeting set detection conditions, the equivalent impedance module in the test circuit is sequentially connected between any two of the high-voltage bus positive terminal, the high-voltage bus negative terminal, and the vehicle ground. The corresponding contact current flowing through the equivalent impedance module is obtained, and the electrical safety status of the vehicle is determined based on the corresponding contact current. Thus, by controlling the on / off states of the first switch K1 to the fourth switch K4 in the test circuit, the equivalent impedance module is sequentially connected between the high-voltage bus positive and negative terminals, the high-voltage bus negative terminal and the vehicle ground, and the high-voltage bus positive terminal and the vehicle ground. After each connection state stabilizes, the voltage across the corresponding capacitor is measured, and the corresponding contact current is determined based on the voltage across the capacitor, thereby comprehensively evaluating the electrical safety status of the vehicle under multiple contact paths.

[0081] Figure 6 This is a block diagram of a vehicle safety detection device provided in one embodiment of the present disclosure.

[0082] like Figure 6 As shown, the vehicle safety detection device 600 of this embodiment includes a control module 610 and a determination module 620.

[0083] The control module 610 is used to control the equivalent impedance module in the test circuit to be connected sequentially between any two of the high voltage bus positive terminal, the high voltage bus negative terminal and the vehicle ground in response to the vehicle meeting the set detection conditions, and to obtain the corresponding contact current flowing through the equivalent impedance module. The determination module 620 is used to determine the electrical safety status of the vehicle based on the corresponding contact current.

[0084] In some embodiments of this disclosure, the control module 610 includes: The first control unit is used to control the equivalent impedance module to be connected between the positive terminal and the negative terminal of the high voltage bus, and to obtain the first contact current flowing through the equivalent impedance module. The second control unit is used to control the connection of the equivalent impedance module between the negative terminal of the high voltage bus and the vehicle ground, and to obtain the second contact current flowing through the equivalent impedance module. The third control unit is used to control the connection of the equivalent impedance module between the positive terminal of the high-voltage bus and the vehicle ground, and to obtain the third contact current flowing through the equivalent impedance module.

[0085] In some embodiments of this disclosure, the determining module 620 includes: The determining unit is used to determine the electrical safety status of the vehicle based on the first contact current, the second contact current, and the third contact current.

[0086] In some embodiments of this disclosure, when the determining unit determines the electrical safety status of the vehicle based on the first contact current, the second contact current, and the third contact current, it includes: The maximum contact current among the first, second, and third contact currents is determined as the target contact current. Based on the target contact current, the electrical safety status of the vehicle is determined, and corresponding safety warning information is output.

[0087] In some embodiments of this disclosure, when the determining unit determines the electrical safety status of the vehicle based on the target contact current and outputs corresponding safety warning information, it includes at least one of the following: In response to the target contact current being less than or equal to a first set current threshold, the electrical safety status is determined to be at the first safety level, and a first safety warning message is output; wherein, the first safety warning message is a normal state indication; In response to a target contact current greater than a first set current threshold and a target contact current less than or equal to a second set current threshold, the electrical safety status level is determined to be the second safety level, and a second safety warning message is output; wherein, the safety of the second safety level is lower than that of the first safety level, and the second safety warning message is a warning indication; In response to the target contact current exceeding the second set current threshold, the electrical safety status level is determined to be dangerous, and a third safety warning message is output; wherein, the third safety warning message is a fault alarm indication.

[0088] In some embodiments of this disclosure, the determining module 620 is further configured to: The insulation condition of the negative terminal of the high-voltage busbar to the vehicle body ground is determined based on the second contact current, and the insulation condition of the positive terminal of the high-voltage busbar to the vehicle body ground is determined based on the third contact current.

[0089] In some embodiments of this disclosure, when the determining module 620 determines the insulation condition of the high-voltage bus negative terminal to the vehicle ground based on the second contact current, it includes: In response to a second contact current exceeding a second set current threshold, it is determined that the insulation between the negative terminal of the high-voltage busbar and the vehicle ground has failed; or, In response to the second contact current being less than or equal to the second set current threshold, it is determined that the insulation between the negative terminal of the high-voltage bus and the vehicle body ground has not failed.

[0090] In some embodiments of this disclosure, when determining the insulation condition of the high-voltage bus positive terminal to the vehicle ground based on the third contact current, the determining module 620 includes: In response to the third contact current exceeding the second set current threshold, it is determined that the insulation between the positive terminal of the high-voltage busbar and the vehicle body ground has failed; or, In response to the third contact current being less than or equal to the second set current threshold, it is determined that the insulation between the positive terminal of the high-voltage bus and the vehicle body ground has not failed.

[0091] In some embodiments of this disclosure, the control module 610 is also used for; In response to receiving a request for high voltage reduction from the vehicle, the second semiconductor switch is disconnected. In response to the second semiconductor switch being in the open state, the discharge switch is controlled to close; In response to the discharge switch being in the closed state, the first semiconductor switch is turned on and off with the target duty cycle to actively discharge the bus capacitor. During the active discharge of the bus capacitor, the active discharge of the bus capacitor is completed when the bus voltage of the high-voltage bus is detected to drop below the set voltage threshold.

[0092] In some embodiments of this disclosure, when the control module 610 is used to determine the target duty cycle, it includes: In response to the detection of a vehicle collision event, the target duty cycle is determined to be the first preset discharge duty cycle; In response to the absence of a detected vehicle collision event, the target duty cycle is determined to be the second preset discharge duty cycle; The first set discharge duty cycle is greater than the second set discharge duty cycle.

[0093] In some embodiments of this disclosure, the control module 610 is further configured to: During the active discharge of the bus capacitor, in response to the temperature of the first semiconductor switch being higher than the set temperature threshold, the target duty cycle is reduced.

[0094] It should be noted that for details not disclosed in the vehicle safety testing device of this disclosure, please refer to the details disclosed in the vehicle safety testing method of this disclosure, which will not be repeated here.

[0095] The vehicle safety detection device of this embodiment, through a first control module, controls the equivalent impedance module in the test circuit to be sequentially connected between any two of the high-voltage bus positive terminal, the high-voltage bus negative terminal, and the vehicle body ground when the vehicle meets the set detection conditions. The device then acquires the corresponding contact current flowing through the equivalent impedance module and determines the vehicle's electrical safety status based on the corresponding contact current through a determination module. Furthermore, by controlling the on / off states of the first to fourth switches K4 in the test circuit, the equivalent impedance module is sequentially connected between the high-voltage bus positive and negative terminals, the high-voltage bus negative terminal and the vehicle body ground, and the high-voltage bus positive terminal and the vehicle body ground. After each connection state stabilizes, the voltage across the corresponding capacitor is measured, and the corresponding contact current is determined based on the voltage across the capacitor, thereby comprehensively evaluating the vehicle's electrical safety status under multiple contact paths.

[0096] To implement the above embodiments, this disclosure also proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements the method as described in any of the foregoing embodiments.

[0097] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this disclosure. The electronic device 700 can be a mobile phone, computer, digital broadcasting terminal, messaging device, game console, tablet device, medical device, fitness equipment, personal digital assistant, vehicle, etc.

[0098] Reference Figure 7 The electronic device 700 may include one or more of the following components: processing component 702, memory 704, power component 706, multimedia component 708, audio component 710, input / output (I / O) interface 712, sensor component 714, and communication component 716.

[0099] Processing component 702 typically controls the overall operation of electronic device 700, such as operations associated with display, telephone calls, data communication, camera operation, and recording operations. Processing component 702 may include one or more processors 720 to execute instructions to complete all or part of the steps of the methods described above. Furthermore, processing component 702 may include one or more modules to facilitate interaction between processing component 702 and other components. For example, processing component 702 may include a multimedia module to facilitate interaction between multimedia component 708 and processing component 702.

[0100] Memory 704 is configured to store various types of data to support the operation of electronic device 700. Examples of such data include instructions for any application or method operating on electronic device 700, contact data, phonebook data, messages, pictures, videos, etc. Memory 704 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0101] Power component 706 provides power to the various components of electronic device 700. Power component 706 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 700.

[0102] Multimedia component 708 includes a screen that provides an output interface between the electronic device 700 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors can sense not only the boundaries of the touch or swipe action but also the duration and pressure associated with the touch or swipe operation.

[0103] Audio component 710 is configured to output and / or input audio signals. For example, audio component 710 includes a microphone (MIC) configured to receive external audio signals when electronic device 700 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 704 or transmitted via communication component 716. In some embodiments, audio component 710 also includes a speaker for outputting audio signals.

[0104] I / O interface 712 provides an interface between processing component 702 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0105] Sensor assembly 714 includes one or more sensors for providing status assessments of various aspects of electronic device 700. For example, sensor assembly 714 can detect the on / off state of electronic device 700, the relative positioning of components such as the display and keypad of electronic device 700, changes in the position of electronic device 700 or a component of electronic device 700, the presence or absence of user contact with electronic device 700, the orientation or acceleration / deceleration of electronic device 700, and temperature changes of electronic device 700.

[0106] Communication component 716 is configured to facilitate wired or wireless communication between electronic device 700 and other devices. Electronic device 700 can access wireless networks based on communication standards, such as WiFi (Wireless Fidelity), 4G (Fourth Generation), or 5G (Fifth Generation), or combinations thereof. In one exemplary embodiment, communication component 716 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel.

[0107] In an exemplary embodiment, the electronic device 700 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the methods described above.

[0108] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 704 including instructions, which can be executed by a processor 720 of an electronic device 700 to perform the above-described method. For example, the computer-readable storage medium may be a read-only memory, a random access memory, a read-only optical disk, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0109] To implement the above embodiments, this disclosure also proposes a vehicle, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to implement the method as described in any of the foregoing embodiments.

[0110] Figure 8 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this disclosure. For example, vehicle 800 can be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicles.

[0111] Reference Figure 8 The vehicle 800 may include various subsystems, such as an infotainment system 810, a perception system 820, a decision control system 830, a drive system 840, and a computing platform 850. The vehicle 800 may also include more or fewer subsystems, and each subsystem may include multiple components. Furthermore, each subsystem and each component of the vehicle 800 can be interconnected via wired or wireless means.

[0112] In some embodiments, the infotainment system 810 may include a communication system, an entertainment system, etc.

[0113] The perception system 820 may include several sensors for sensing information about the environment surrounding the vehicle 800. For example, the perception system 820 may include a global positioning system (which may be GPS, BeiDou, or other positioning systems), an inertial measurement unit (IMU), lidar, millimeter-wave radar, ultrasonic radar, and a camera device.

[0114] The decision control system 830 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0115] The drive system 840 may include components that provide powered motion to the vehicle 800. In one embodiment, the drive system 840 may include an engine, an energy source, a transmission system, and wheels. The engine may be one or a combination of internal combustion engines, electric motors, and compressed air engines. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0116] Some or all of the functions of the vehicle 800 are controlled by a computing platform 850. The computing platform 850 may include at least one processor 851 and a memory 852, the processor 851 being able to execute instructions 853 stored in the memory 852.

[0117] Processor 851 can be any conventional processor, such as a central processing unit (CPU). Processors may also include graphics processing units (GPUs), field-programmable gate arrays (FPGAs), systems-on-chips (SoCs), application-specific integrated circuits (ASICs), or combinations thereof.

[0118] The memory 852 can be implemented by any type of volatile or non-volatile storage device or a combination thereof.

[0119] In addition to instruction set 853, memory 852 can also store data, such as road maps, route information, vehicle position, direction, speed, and other data. The data stored in memory 852 can be used by computing platform 850.

[0120] In this embodiment of the disclosure, processor 851 may execute instructions 853 to complete all or part of the steps of the above-described method embodiments.

[0121] To implement the above embodiments, this disclosure also proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in any of the foregoing method embodiments.

[0122] To implement the above embodiments, this disclosure also proposes a computer program product having a computer program stored thereon, which, when executed by a processor, implements the method described in any of the foregoing method embodiments.

[0123] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0124] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0125] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.

[0126] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequential list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-including system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0127] It should be understood that various parts of this disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0128] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0129] Furthermore, the functional units in the various embodiments of this disclosure can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0130] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A test circuit, characterized in that, include: Equivalent impedance module, first switch, second switch, third switch, and fourth switch; wherein, The first end of the equivalent impedance module is connected to the first end of the first switch and the first end of the second switch respectively. The second end of the first switch serves as the first measurement end of the test circuit, and the second end of the second switch is connected to the ground end. The second terminal of the equivalent impedance module is connected to the first terminal of the third switch and the first terminal of the fourth switch, respectively. The second terminal of the third switch is connected to the ground terminal, and the second terminal of the fourth switch serves as the second measurement terminal of the test circuit.

2. The test circuit according to claim 1, characterized in that, The first measuring terminal is connected to the positive terminal of the vehicle's high-voltage bus, the second measuring terminal is connected to the negative terminal of the high-voltage bus, and the grounding terminal is connected to the vehicle's ground; wherein... When both the first switch and the fourth switch are closed and both the second switch and the third switch are open, the equivalent impedance module is connected between the positive terminal and the negative terminal of the high-voltage busbar to simulate the first scenario where a human body is simultaneously in contact with both the positive terminal and the negative terminal of the high-voltage busbar. When both the second and fourth switches are closed and both the first and third switches are open, the equivalent impedance module is connected between the negative terminal of the high-voltage bus and the vehicle ground to simulate the second scenario where a human body is simultaneously in contact with the negative terminal of the high-voltage bus and the vehicle ground. When both the first and third switches are closed and both the second and fourth switches are open, the equivalent impedance module is connected between the positive terminal of the high-voltage bus and the vehicle ground to simulate a third scenario where a human body is simultaneously in contact with both the positive terminal of the high-voltage bus and the vehicle ground.

3. The test circuit according to claim 2, characterized in that, The equivalent impedance module includes: a first resistor, a second resistor, a third resistor, a first capacitor, and a second capacitor; wherein, The first terminal of the first resistor and the first terminal of the first capacitor are connected to form a first node, and the first node is connected to the first terminal of the first switch and the first terminal of the second switch respectively. The second terminal of the first resistor and the second terminal of the first capacitor are connected to form a second node. The second node is connected to the first terminal of the second resistor and the first terminal of the third resistor, respectively. The second terminal of the third resistor is connected to the first terminal of the second capacitor. The second end of the second resistor and the second end of the second capacitor are connected to form a third node, and the third node is connected to the first end of the third switch and the first end of the fourth switch respectively. The first resistor and the second resistor together constitute the equivalent resistance of the human body.

4. The test circuit according to claim 3, characterized in that, In any of the first, second, and third scenarios, the corresponding contact current flowing through the equivalent impedance module is determined based on the voltage across the second capacitor and the resistance of the second resistor.

5. The test circuit according to claim 3, characterized in that, The equivalent impedance module further includes: a fourth resistor; Wherein, the first end of the fourth resistor is connected to the first measuring end, and the second end of the fourth resistor is connected to the second measuring end.

6. The test circuit according to claim 5, characterized in that, The first measuring terminal is connected to the positive terminal of the high-voltage busbar of the vehicle, and the second measuring terminal is connected to the negative terminal of the high-voltage busbar; wherein... When the first switch, the second switch, the third switch, and the fourth switch are all open, the fourth resistor is connected between the positive terminal and the negative terminal of the high-voltage bus. The open-circuit voltage of the high-voltage bus is determined based on the voltage value across the fourth resistor and the resistance value of the fourth resistor.

7. A vehicle safety inspection method, characterized in that, The high-voltage system of the vehicle includes a high-voltage bus and a test circuit. A first measuring terminal of the test circuit is connected to the positive terminal of the high-voltage bus, a second measuring terminal of the test circuit is connected to the negative terminal of the high-voltage bus, and a grounding terminal of the test circuit is connected to the vehicle body ground. The method includes: In response to the vehicle meeting the set detection conditions, the equivalent impedance module in the test circuit is controlled to be connected sequentially between any two of the positive terminal of the high voltage bus, the negative terminal of the high voltage bus, and the vehicle ground, and the corresponding contact current flowing through the equivalent impedance module is obtained. The electrical safety status of the vehicle is determined based on the corresponding contact current.

8. The method according to claim 7, characterized in that, The equivalent impedance module in the control test circuit is sequentially connected between any two of the positive terminal of the high-voltage bus, the negative terminal of the high-voltage bus, and the vehicle ground, and the corresponding contact current flowing through the equivalent impedance module is obtained, including: The equivalent impedance module is controlled to be connected between the positive terminal and the negative terminal of the high voltage bus, and the first contact current flowing through the equivalent impedance module is obtained. The equivalent impedance module is connected between the negative terminal of the high-voltage bus and the vehicle ground, and the second contact current flowing through the equivalent impedance module is obtained. The equivalent impedance module is connected between the positive terminal of the high-voltage bus and the vehicle ground, and the third contact current flowing through the equivalent impedance module is obtained.

9. The method according to claim 8, characterized in that, Determining the electrical safety status of the vehicle based on the corresponding contact current includes: The electrical safety status of the vehicle is determined based on the first contact current, the second contact current, and the third contact current.

10. The method according to claim 9, characterized in that, Determining the electrical safety status of the vehicle based on the first contact current, the second contact current, and the third contact current includes: The maximum contact current among the first contact current, the second contact current, and the third contact current is determined as the target contact current; Based on the target contact current, the electrical safety status of the vehicle is determined, and corresponding safety warning information is output.

11. The method according to claim 10, characterized in that, The step of determining the electrical safety status of the vehicle based on the target contact current and outputting corresponding safety warning information includes at least one of the following: In response to the target contact current being less than or equal to a first set current threshold, the electrical safety status is determined to be a first safety level, and a first safety warning message is output; wherein, the first safety warning message is a normal status indication; In response to the target contact current being greater than the first set current threshold and the target contact current being less than or equal to the second set current threshold, the electrical safety status level is determined to be the second safety level, and a second safety warning message is output; wherein, the safety of the second safety level is lower than that of the first safety level, and the second safety warning message is a warning indication; In response to the target contact current being greater than the second set current threshold, the electrical safety status level is determined to be a dangerous level, and a third safety warning message is output; wherein, the third safety warning message is a fault alarm indication.

12. The method according to claim 8, characterized in that, The method further includes: Based on the second contact current, determine the insulation status of the negative terminal of the high-voltage bus to the vehicle ground; Based on the third contact current, the insulation status of the positive terminal of the high-voltage busbar to the vehicle body ground is determined.

13. The method according to claim 12, characterized in that, Determining the insulation status of the negative terminal of the high-voltage busbar to the vehicle ground based on the second contact current includes: In response to the second contact current being greater than a second set current threshold, it is determined that the insulation between the negative terminal of the high-voltage bus and the vehicle body ground has failed. In response to the second contact current being less than or equal to a second set current threshold, it is determined that the insulation between the negative terminal of the high-voltage bus and the vehicle body ground has not failed.

14. The method according to claim 12, characterized in that, Determining the insulation status of the positive terminal of the high-voltage busbar to the vehicle ground based on the third contact current includes: In response to the third contact current being greater than the second set current threshold, it is determined that the insulation between the positive terminal of the high-voltage bus and the vehicle body ground has failed. In response to the third contact current being less than or equal to the second set current threshold, it is determined that the insulation between the positive terminal of the high-voltage bus and the vehicle body ground has not failed.

15. The method according to claim 7, characterized in that, The high-voltage system further includes a first semiconductor switch, a second semiconductor switch, a power battery, a bus capacitor, and a discharge switch. The first semiconductor switch is connected between the positive terminal of the high-voltage bus and the positive terminal of the power battery. The second semiconductor switch is connected between the negative terminal of the high-voltage bus and the negative terminal of the power battery. The bus capacitor is connected between the positive terminal of the high-voltage bus and the negative terminal of the high-voltage bus. The discharge switch is connected between the positive terminal of the power battery and the negative terminal of the high-voltage bus. The vehicle meets the set detection conditions, including: In response to receiving a request for high voltage reduction from the vehicle, the second semiconductor switch is controlled to disconnect. In response to the second semiconductor switch being in the open state, the discharge switch is controlled to close; In response to the discharge switch being in a closed state, the first semiconductor switch is controlled to turn on and off with a target duty cycle to actively discharge the bus capacitor. During the active discharge of the bus capacitor, in response to the detection that the bus voltage of the high-voltage bus has dropped below a set voltage threshold, it is determined that the active discharge of the bus capacitor has been completed.

16. The method according to claim 15, characterized in that, The determination of the target duty cycle includes at least one of the following: In response to detecting a collision event involving the vehicle, the target duty cycle is determined to be a first preset discharge duty cycle; In response to the absence of a detected collision event involving the vehicle, the target duty cycle is determined to be a second preset discharge duty cycle; Wherein, the first set discharge duty cycle is greater than the second set discharge duty cycle.

17. The method according to claim 15, characterized in that, The method further includes: During the active discharge of the bus capacitor, in response to the temperature of the first semiconductor switch being higher than a set temperature threshold, the target duty cycle is reduced.

18. A vehicle safety detection device, characterized in that, The vehicle's high-voltage system includes a high-voltage bus and a test circuit. A first measuring terminal of the test circuit is connected to the positive terminal of the high-voltage bus, a second measuring terminal of the test circuit is connected to the negative terminal of the high-voltage bus, and a grounding terminal of the test circuit is connected to the vehicle body ground. The device includes: The control module is used to control the equivalent impedance module in the test circuit to be connected sequentially between any two of the positive terminal of the high voltage bus, the negative terminal of the high voltage bus, and the vehicle ground in response to the vehicle meeting the set detection conditions, and to obtain the corresponding contact current flowing through the equivalent impedance module. The determination module is used to determine the electrical safety status of the vehicle based on the corresponding contact current.

19. The apparatus according to claim 18, characterized in that, The control module includes: The first control unit is used to control the equivalent impedance module to be connected between the positive terminal of the high voltage bus and the negative terminal of the high voltage bus, and to obtain the first contact current flowing through the equivalent impedance module. The second control unit is used to control the equivalent impedance module to be connected between the negative terminal of the high voltage bus and the vehicle ground, and to obtain the second contact current flowing through the equivalent impedance module; The third control unit is used to control the equivalent impedance module to be connected between the positive terminal of the high voltage bus and the vehicle ground, and to obtain the third contact current flowing through the equivalent impedance module.

20. The apparatus according to claim 19, characterized in that, The determining module includes: The determining unit is configured to determine the electrical safety status of the vehicle based on the first contact current, the second contact current, and the third contact current.

21. An electronic device, characterized in that, The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements the vehicle safety detection method as described in any one of claims 7-17.

22. A vehicle, characterized in that, The high-voltage system of the vehicle includes a high-voltage bus and a test circuit. The first measuring terminal of the test circuit is connected to the positive terminal of the high-voltage bus, the second measuring terminal of the test circuit is connected to the negative terminal of the high-voltage bus, and the grounding terminal of the test circuit is connected to the vehicle body ground. The vehicle also includes: processor; Memory used to store processor-executable instructions; The processor is configured as follows: Implement the vehicle safety testing method as described in any one of claims 7-17.

23. A non-transitory computer-readable storage medium, wherein instructions in the storage medium, when executed by a processor, enable the processor to perform the vehicle safety detection method as described in any one of claims 7-17.

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