Fault detection method and device of switching device, vehicle, storage medium and product

Abstract

The invention relates to a fault detection method and device of a switching device, a vehicle, a storage medium and a product, and relates to the technical field of fault detection, the switching device is arranged in a DCDC reverse charging circuit, the DCDC reverse charging circuit comprises a DCDC reverse charging module, a first capacitor and a second capacitor, the first capacitor and the second capacitor are connected in parallel and then are connected with the DCDC reverse charging module, and the first capacitor and the second capacitor are connected with the DCDC reverse charging module. The switching device is connected in series with the second capacitor, and the method comprises the step of determining a fault detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor. For the DCDC reverse charging circuit in which the first capacitor and the second capacitor are pre-charged by using the DCDC reverse charging module, the voltage of the first capacitor and the voltage of the second capacitor can be obtained, and whether the switching device has a fault is determined through the voltage of the first capacitor and the voltage of the second capacitor, so that fault detection of the switching device in the DCDC reverse charging circuit is realized.

Description

Technical Field

[0001] The present disclosure relates to the technical field of fault detection, and particularly to a fault detection method, device, vehicle, storage medium and product for a switching device. Background Art

[0002] When an electric vehicle powers on to high voltage, it is necessary to pre-charge all the capacitors on the high-voltage bus side to make the bus voltage reach the voltage of the power battery pack.

[0003] In related technologies, a pre-charge resistor circuit is used to pre-charge the capacitor. In the pre-charge resistor circuit, power can be taken from the power battery through the pre-charge resistor to pre-charge the capacitor. For the detection of the switching device in the pre-charge resistor circuit, the voltage values at the input end and the output end of the switching device can be detected respectively, and the voltage values at the input end and the output end of the switching device can be compared to determine whether the switching device has a fault. Summary of the Invention

[0004] To overcome the problem in related technologies that the fault of the switching device in the DCDC buck-boost circuit cannot be detected, the present disclosure provides a fault detection method, device, vehicle, storage medium and product for a switching device. For a DCDC buck-boost circuit that pre-charges a first capacitor and a second capacitor by using a DCDC buck-boost module, the voltage of the first capacitor and the voltage of the second capacitor can be obtained, and whether the switching device has a fault can be determined based on the voltage of the first capacitor and the voltage of the second capacitor, so as to realize the fault detection of the switching device in the DCDC buck-boost circuit.

[0005] According to the first aspect of the embodiments of the present disclosure, a fault detection method for a switching device is provided. The switching device is disposed in a DCDC buck-boost circuit, and the DCDC buck-boost circuit includes a DCDC buck-boost module, a first capacitor and a second capacitor. The first capacitor and the second capacitor are connected in parallel and then connected to the DCDC buck-boost module, and the switching device is connected in series with the second capacitor. The method includes: Determine the fault detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor.

[0006] Optionally, the fault detection result includes a sticking detection result; The determining the fault detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor includes: Control the switching device to disconnect, and determine the sticking detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor.

[0007] Optionally, controlling the switching device to disconnect and determining the adhesion detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor includes: Controlling the switching device to disconnect and obtaining a first voltage of the first capacitor and a second voltage of the second capacitor; When the first voltage and the second voltage meet a preset condition, controlling the DCDC reverse charging module to pre-charge the voltage of the first capacitor to a third voltage, and obtaining a fourth voltage of the second capacitor, where the third voltage is greater than the second voltage; Determining the adhesion detection result of the switching device according to the third voltage and the fourth voltage.

[0008] Optionally, when the first voltage and the second voltage meet a preset condition, controlling the DCDC reverse charging module to pre-charge the voltage of the first capacitor to a third voltage includes: When both the first voltage and the second voltage are less than a first preset voltage, controlling the DCDC reverse charging module to pre-charge the voltage of the first capacitor to the third voltage.

[0009] Optionally, when the first voltage and the second voltage meet a preset condition, controlling the DCDC reverse charging module to pre-charge the voltage of the first capacitor to a third voltage includes: When either one of the first voltage and the second voltage is greater than or equal to the first preset voltage, and the difference between the first voltage and the second voltage is less than or equal to a second preset voltage, controlling the DCDC reverse charging module to pre-charge the voltage of the first capacitor to the third voltage.

[0010] Optionally, determining the adhesion detection result of the switching device according to the third voltage and the fourth voltage includes: When the difference between the third voltage and the fourth voltage is less than or equal to the second preset voltage and the duration is greater than or equal to a first preset duration, determining the adhesion detection result of the switching device as a first detection result, where the first detection result indicates that the switching device has an adhesion fault, the third voltage is the sum of the second voltage and a third preset voltage, and the third preset voltage is greater than the second preset voltage.

[0011] Optionally, determining the adhesion detection result of the switching device according to the third voltage and the fourth voltage includes: When the difference between the third voltage and the fourth voltage is greater than a second preset voltage, or when the duration for which the difference between the third voltage and the fourth voltage is less than or equal to the second preset voltage is less than a first preset duration, determine that the adhesion detection result of the switching device is a second detection result, where the second detection result indicates that there is no adhesion fault in the switching device. The third voltage is the sum of the second voltage and a third preset voltage, and the third preset voltage is greater than the second preset voltage.

[0012] Optionally, the method further includes: When any one of the first voltage and the second voltage is greater than or equal to a first preset voltage, and the difference between the first voltage and the second voltage is greater than a second preset voltage, determine that the adhesion detection result of the switching device is a second detection result, where the second detection result indicates that there is no adhesion fault in the switching device.

[0013] Optionally, the fault detection result further includes a normally open detection result; The determining the fault detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor further includes: When there is no adhesion fault in the switching device, control the switching device to close, and determine the normally open detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor.

[0014] Optionally, the controlling the switching device to close and determining the normally open detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor includes: Control the switching device to close, and control the DCDC recharge module to precharge the voltage of the first capacitor to a fifth voltage, and obtain a sixth voltage of the second capacitor; Determine the normally open detection result of the switching device according to the fifth voltage and the sixth voltage.

[0015] Optionally, the determining the normally open detection result of the switching device according to the fifth voltage and the sixth voltage includes: When the difference between the fifth voltage and the sixth voltage is greater than a second preset voltage and the duration is greater than or equal to a second preset duration, determine that the normally open detection result of the switching device is a third detection result, where the third detection result indicates that there is a normally open fault in the switching device.

[0016] Optionally, the determining the normally open detection result of the switching device according to the fifth voltage and the sixth voltage includes: When the difference between the fifth voltage and the sixth voltage is less than or equal to a second preset voltage, or when the duration for which the difference between the fifth voltage and the sixth voltage is greater than the second preset voltage is less than a second preset duration, determine that the normally-open detection result of the switching device is a fourth detection result, where the fourth detection result indicates that there is no normally-open fault in the switching device.

[0017] According to a second aspect of the embodiments of the present disclosure, there is provided a fault detection device for a switching device. The switching device is disposed in a DCDC buck-boost circuit, and the DCDC buck-boost circuit includes a DCDC buck-boost module, a first capacitor, and a second capacitor. The first capacitor and the second capacitor are connected in parallel and then connected to the DCDC buck-boost module. The switching device is connected in series with the second capacitor. The device includes: A detection module configured to determine a fault detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor.

[0018] According to a third aspect of the embodiments of the present disclosure, there is provided a fault detection device for a switching device, including: A processor; A memory for storing instructions executable by the processor; Wherein, the processor is configured to perform the steps of the fault detection method for the switching device provided in the first aspect of the present disclosure when executed.

[0019] According to a fourth aspect of the embodiments of the present disclosure, there is provided a vehicle, including the fault detection device for the switching device provided in the third aspect of the present disclosure, and a DCDC buck-boost circuit in the fault detection method for the switching device provided in the first aspect of the present disclosure. The DCDC buck-boost module and the switching device in the DCDC buck-boost circuit are both connected to the fault detection device for the switching device.

[0020] According to a fifth aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium having computer program instructions stored thereon, and when the computer program instructions are executed by a processor, the steps of the fault detection method for the switching device provided in the first aspect of the present disclosure are implemented.

[0021] According to a fifth aspect of the embodiments of the present disclosure, there is provided a computer program product including a computer program, and when the computer program is executed by a processor, the steps of the fault detection method for the switching device provided in the first aspect of the present disclosure are implemented.

[0022] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: For a DCDC buck-boost circuit that pre-charges a first capacitor and a second capacitor by using a DCDC buck-boost module, the voltages of the first capacitor and the second capacitor can be obtained, and whether there is a fault in the switching device can be determined based on the voltages of the first capacitor and the second capacitor, so as to achieve fault detection of the switching device in the DCDC buck-boost circuit.

[0023] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0025] Figure 1 is a schematic diagram of a buck-boost circuit shown according to an exemplary embodiment.

[0026] Figure 2 is a flowchart of a method for detecting a fault in a switching device shown according to an exemplary embodiment.

[0027] Figure 3 is a flowchart of another method for detecting a fault in a switching device shown according to an exemplary embodiment.

[0028] Figure 4 is a block diagram of a device for detecting a fault in a switching device shown according to an exemplary embodiment.

[0029] Figure 5 is a block diagram of another device for detecting a fault in a switching device shown according to an exemplary embodiment. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0031] The embodiments described in some embodiments of the present disclosure below do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0032] It should be noted that all actions of obtaining signals, information, or data in the present disclosure are carried out on the premise of complying with the corresponding data protection regulations and policies of the country where the location is located and obtaining authorization from the owner of the corresponding device.

[0033] When the electric vehicle is powered on with high voltage, it is necessary to pre-charge all the capacitors on the high-voltage bus side to make the bus voltage reach the voltage of the power battery pack.

[0034] In the related art, the capacitor is pre-charged through a pre-charge resistor circuit. In the pre-charge resistor circuit, power can be taken from the power battery through the pre-charge resistor, and the capacitor is pre-charged. For the detection of the switching device in the pre-charge resistor circuit, voltage sampling points can be added on the input side and the output side of the switching device respectively to detect the voltage values at the input end and the output end of the switching device, and compare the voltage values at the input end and the output end of the switching device to determine whether the switching device has a fault. However, the premise of this detection method is that there is a real and effective input voltage at the input end of the switching device. In the DCDC buck-boost circuit, when the switching device is closed, there may not be a real and effective input voltage at the input side of the switching device, resulting in the inapplicability of this detection method to the DCDC buck-boost circuit that uses the DCDC buck-boost module to pre-charge the first capacitor and the second capacitor, and it is impossible to accurately detect whether the switching device in the DCDC buck-boost circuit has a fault through this detection method.

[0035] In view of the above technical problems, the embodiments of the present disclosure provide a method, device, vehicle, storage medium and product for detecting the fault of a switching device. For a DCDC buck-boost circuit that uses a DCDC buck-boost module to pre-charge a first capacitor and a second capacitor, the voltage of the first capacitor and the voltage of the second capacitor can be obtained, and whether the switching device has a fault can be determined through the voltage of the first capacitor and the voltage of the second capacitor, so as to realize the fault detection of the switching device in the DCDC buck-boost circuit.

[0036] Figure 1 is a schematic diagram of a buck-boost circuit shown according to an exemplary embodiment, as Figure 1 shown, the buck-boost circuit may include a DCDC buck-boost module, a first capacitor and a second capacitor. The first capacitor and the second capacitor are connected in parallel and then connected to the DCDC buck-boost module, and the switching device is connected in series with the second capacitor. Among them, the DCDC buck-boost module may include a voltage battery and a DCDC converter. Among them, the voltage battery may be a 12V storage battery, and the DCDC converter can take power from the low-voltage battery, perform voltage conversion, and cooperate with the switching device to pre-charge the first capacitor and the second capacitor in order to increase the voltage of the first capacitor and the second capacitor. The first capacitor may be a front motor capacitor, and the second capacitor may be a rear motor capacitor.

[0037] Figure 2 is a flowchart of a method for detecting the fault of a switching device shown according to an exemplary embodiment, as Figure 2 shown, which may include the following steps: In step S201, according to the voltage of the first capacitor and the voltage of the second capacitor, determine the fault detection result of the switching device.

[0038] In this embodiment, the switching device can be the switching device in the DCDC buck-boost circuit. The DCDC buck-boost circuit can include a DCDC buck-boost module, a first capacitor, and a second capacitor. The first capacitor and the second capacitor are connected in parallel and then connected to the DCDC buck-boost module. The switching device is connected in series with the second capacitor. The specific connection manner can be referred to Figure 1 .

[0039] In this embodiment, considering that in the DCDC buck-boost circuit, when the switching device is closed, there may not be a real and effective input voltage on the input side of the switching device, and it is impossible to determine whether the switching device has a fault by detecting the voltages at the input end and the output end of the switching device. Therefore, a new fault detection method for the switching device in the DCDC buck-boost circuit is proposed. By obtaining the voltages of the first capacitor and the second capacitor and based on the relationship between the voltages of the first capacitor and the second capacitor, the fault detection result of the switching device can be obtained more accurately. Among them, the fault detection result can include a stuck detection result and an open detection result. The stuck detection result can indicate whether the switching device has a stuck fault, that is, the switching device is always in the closed state and cannot be disconnected; the open detection result can indicate whether the switching device has an open fault, that is, the switching device is always in the open state and cannot be closed. In a possible implementation manner, the fault detection result includes a stuck detection result.

[0040] Determining the fault detection result of the switching device according to the voltages of the first capacitor and the second capacitor includes: Controlling the switching device to disconnect, and determining the stuck detection result of the switching device according to the voltages of the first capacitor and the second capacitor.

[0041] In this embodiment, before pre-charging the first capacitor and the second capacitor in the DCDC buck-boost circuit, the switching device can be controlled to disconnect first. Then, after controlling the switching device to disconnect, the voltages of the first capacitor and the second capacitor are obtained, and the stuck detection result of the switching device is obtained through the obtained voltages of the first capacitor and the second capacitor. Therefore, it can be determined whether the switching device has a stuck fault by whether the voltages of the first capacitor and the second capacitor when the switching device is disconnected meet the expected results.

[0042] Among them, controlling the switching device to disconnect can be understood as sending a disconnection instruction to the switching device. When there is no adhesion fault in the switching device, the switching device can be normally disconnected. At this time, the voltages of the first capacitor and the second capacitor when the switching device is disconnected are obtained; when there is an adhesion fault in the switching device, the switching device cannot be normally disconnected. At this time, the voltages of the first capacitor and the second capacitor when the switching device is closed are obtained. Thus, it can be determined whether the voltages of the first capacitor and the second capacitor obtained conform to the voltages in the case of an adhesion fault or the voltages in the case of normal disconnection, and further determine whether there is an adhesion fault in the switching device to obtain an adhesion detection result.

[0043] In a possible implementation manner, controlling the switching device to disconnect and determining the adhesion detection result of the switching device according to the voltages of the first capacitor and the second capacitor includes: Controlling the switching device to disconnect and obtaining the first voltage of the first capacitor and the second voltage of the second capacitor; when the first voltage and the second voltage meet a preset condition, controlling the DCDC reverse charging module to pre-charge the voltage of the first capacitor to a third voltage, and obtaining the fourth voltage of the second capacitor, where the third voltage is greater than the second voltage; determining the adhesion detection result of the switching device according to the third voltage and the fourth voltage.

[0044] In this implementation manner, the switching device can be first controlled to disconnect, and the first voltage of the first capacitor and the second voltage of the second capacitor can be obtained, and then it can be determined whether the first voltage and the second voltage meet the preset condition. The preset condition is used to determine whether the first voltage and the second voltage are close or both close to 0 to avoid misdiagnosis. When the first voltage and the second voltage meet the preset condition, the first voltage and the second voltage are close or both close to 0. At this time, a diagnosis result cannot be obtained. The voltage of the first capacitor can be pre-charged to a third voltage by controlling the DCDC reverse charging module, and the third voltage is greater than the second voltage. At this time, since the switching device is controlled to be disconnected, the DCDC reverse charging module will not pre-charge the second capacitor, that is, the voltage of the second capacitor will not change under normal circumstances. However, if there is an adhesion fault in the switching device, the voltage of the second capacitor will also increase. The fourth voltage of the second capacitor can be obtained when the voltage of the first capacitor is pre-charged to the third voltage, and then the adhesion detection result of the switching device can be determined according to the third voltage and the fourth voltage. It can be determined whether the third voltage and the fourth voltage meet the voltages of the first capacitor and the second capacitor when the switching device is disconnected to determine whether there is an adhesion fault in the switching device.

[0045] In a possible implementation manner, when the first voltage and the second voltage meet the preset condition, controlling the DCDC reverse charging module to pre-charge the voltage of the first capacitor to the third voltage includes: When both the first voltage and the second voltage are less than the first preset voltage, control the DCDC buck-boost module to pre-charge the voltage of the first capacitor to the third voltage.

[0046] In this embodiment, the first preset voltage is the voltage threshold to avoid misjudgment. When both the first voltage and the second voltage are less than the first preset voltage, the detected first voltage and second voltage may be inaccurate, which is likely to cause misjudgment. At this time, the adhesion detection result cannot be directly obtained. The DCDC buck-boost module can be controlled to pre-charge the voltage of the first capacitor to the third voltage, which can be greater than the second voltage and greater than the first preset voltage, so as to create a voltage difference between the first capacitor and the second capacitor, and then facilitate the determination of whether there is an adhesion fault. For example, the value range of the first preset voltage can be 10 V to 20V.

[0047] In a possible implementation, when the first voltage and the second voltage meet the preset conditions, controlling the DCDC buck-boost module to pre-charge the voltage of the first capacitor to the third voltage includes: When either of the first voltage and the second voltage is greater than or equal to the first preset voltage, and the difference between the first voltage and the second voltage is less than or equal to the second preset voltage, control the DCDC buck-boost module to pre-charge the voltage of the first capacitor to the third voltage.

[0048] In this embodiment, the second preset voltage is the voltage threshold for determining whether there is adhesion. For example, the value range of the second preset voltage can be 10 V to 15V. If either of the first voltage and the second voltage is greater than or equal to the first preset voltage, and the difference between the first voltage and the second voltage is less than or equal to the second preset voltage, the first voltage and the second voltage are close, but it may be caused by the detection error, so it is also impossible to directly determine whether there is an adhesion fault in the switching device. The DCDC buck-boost module can be controlled to pre-charge the voltage of the first capacitor to the third voltage, which can be greater than the second voltage and greater than the first preset voltage, so as to create a voltage difference between the first capacitor and the second capacitor, and then facilitate the determination of whether there is an adhesion fault. For example, the value range of the first preset voltage can be 10 V to 20V. Here, the difference between the first voltage and the second voltage can be understood as the gap value between the first voltage and the second voltage, that is, the difference between the first voltage and the second voltage can be the absolute value after subtracting the second voltage from the first voltage. The difference between the subsequent two voltages can be understood with reference to this.

[0049] In a possible implementation, determining the adhesion detection result of the switching device according to the third voltage and the fourth voltage includes: When the difference between the third voltage and the fourth voltage is less than or equal to the second preset voltage and the duration is greater than or equal to the first preset duration, determine that the adhesion detection result of the switching device is the first detection result, where the first detection result indicates that the switching device has an adhesion fault. The third voltage is the sum of the second voltage and the third preset voltage, and the third preset voltage is greater than the second preset voltage.

[0050] In this embodiment, the second preset voltage is the voltage threshold for determining whether there is adhesion. For example, the value range of the second preset voltage can be 10 V to 15 V. The third preset voltage can be greater than the second preset voltage. For example, the third preset voltage can be the second preset voltage plus the fourth preset voltage, where the value range of the fourth preset voltage can be 5 V to 10 V to create a voltage range to avoid misdiagnosis of adhesion. Furthermore, the third voltage can be determined. The third voltage can be the sum of the second voltage and the third preset voltage. After obtaining the third voltage, the DCDC buck-boost module can be controlled to pre-charge the voltage of the first capacitor to the third voltage and obtain the fourth voltage of the second capacitor. Then, based on the third voltage, the fourth voltage, and the second preset voltage, it can be determined whether the switching device is adhered.

[0051] Specifically, when the difference between the third voltage and the fourth voltage is less than or equal to the second preset voltage and the duration is greater than or equal to the first preset duration, it indicates that the second capacitor has also been pre-charged, causing the voltage of the second capacitor to increase and approach the voltage of the first capacitor, which does not conform to the control result of the DCDC buck-boost circuit. At this time, the adhesion detection result of the switching device can be determined as the first detection result, where the first detection result indicates that the switching device has an adhesion fault.

[0052] In a possible implementation, determining the adhesion detection result of the switching device according to the third voltage and the fourth voltage includes: When the difference between the third voltage and the fourth voltage is greater than the second preset voltage, or when the duration of the difference between the third voltage and the fourth voltage being less than or equal to the second preset voltage is less than the first preset duration, determine that the adhesion detection result of the switching device is the second detection result, where the second detection result indicates that the switching device does not have an adhesion fault. The third voltage is the sum of the second voltage and the third preset voltage, and the third preset voltage is greater than the second preset voltage.

[0053] In this embodiment, when the difference between the third voltage and the fourth voltage is greater than the second preset voltage, or when the duration for which the difference between the third voltage and the fourth voltage is less than or equal to the second preset voltage is less than the first preset duration, it indicates that only the first capacitor has been pre-charged. As a result, a voltage difference exists between the first capacitor and the second capacitor, and this voltage difference is stable and greater than the second preset voltage, which is consistent with the control result of the DCDC reverse charging circuit. At this time, the adhesion detection result of the switching device can be determined as the second detection result, and the second detection result indicates that there is no adhesion fault in the switching device.

[0054] In a possible implementation manner, the method further includes: When either the first voltage or the second voltage is greater than or equal to the first preset voltage, and the difference between the first voltage and the second voltage is greater than the second preset voltage, determine the adhesion detection result of the switching device as the second detection result, where the second detection result indicates that there is no adhesion fault in the switching device.

[0055] In this embodiment, when either the first voltage or the second voltage is greater than or equal to the first preset voltage, the possibility of misdiagnosis is excluded, and it is possible to directly determine whether there is an adhesion fault based on the second preset voltage. When the difference between the first voltage and the second voltage is greater than the second preset voltage, the adhesion detection result of the switching device can be determined as the second detection result, and the second detection result indicates that there is no adhesion fault in the switching device.

[0056] In a possible implementation manner, the fault detection result further includes a normally open detection result.

[0057] Determining the fault detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor further includes: When there is no adhesion fault in the switching device, control the switching device to close, and determine the normally open detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor.

[0058] In this embodiment, when there is no adhesion fault in the switching device, it is possible to continue to determine whether the switching device has a normally open fault. Specifically, the switching device can be controlled to close, and then the voltages of the first capacitor and the second capacitor after controlling the switching device to close can be obtained. Then, the normally open detection result of the switching device can be obtained through the obtained voltages of the first capacitor and the second capacitor. Thus, it is possible to determine whether the switching device has a normally open fault by whether the voltages of the first capacitor and the second capacitor when the switching device is controlled to close conform to the expected results.

[0059] Among them, controlling the switch device to close can be understood as sending a closing instruction to the switch device. When the switch device does not have a normally open fault, the switch device can close normally. At this time, the voltages of the first capacitor and the second capacitor when the switch device is closed are obtained; when the switch device has a normally open fault, the switch device cannot close normally. At this time, the voltages of the first capacitor and the second capacitor when the switch device is open are obtained. Thus, it can be determined whether the voltages of the first capacitor and the second capacitor obtained conform to the voltages in the case of a normally open fault or the voltages in the case of normal closing, and then it can be determined whether the switch device has a normally open fault, and a normally open detection result is obtained.

[0060] In a possible implementation manner, controlling the switch device to close and determining the normally open detection result of the switch device according to the voltages of the first capacitor and the second capacitor includes: Controlling the switch device to close, controlling the DCDC reverse charging module to pre-charge the voltage of the first capacitor to a fifth voltage, and obtaining a sixth voltage of the second capacitor; determining the normally open detection result of the switch device according to the fifth voltage and the sixth voltage.

[0061] In this implementation manner, the fifth voltage can be the voltage of the power battery. The DCDC reverse charging module can be directly controlled to pre-charge the voltage of the first capacitor to the voltage of the power battery, and the sixth voltage of the second capacitor is obtained. At this time, since the control instruction of the switch device is a closing instruction, under normal circumstances, that is, when the switch device does not have a normally open fault, the switch device will close, so that the second capacitor can be pre-charged at the same time, making the voltage of the second capacitor equal to or close to the voltage of the first capacitor. If the switch device has a normally open fault, the switch device remains in the open state. At this time, only the voltage of the first capacitor is pre-charged to the fifth voltage, and the voltage of the second capacitor remains unchanged. Thus, the normally open detection result of the switch device can be determined according to the fifth voltage and the sixth voltage. It can be judged whether the fifth voltage and the sixth voltage meet the voltages of the first capacitor and the second capacitor when the switch device is closed to judge whether the switch device has a normally open fault.

[0062] In a possible implementation manner, determining the normally open detection result of the switch device according to the fifth voltage and the sixth voltage includes: When the difference between the fifth voltage and the sixth voltage is greater than a second preset voltage and the duration is greater than or equal to a second preset duration, determining that the normally open detection result of the switch device is a third detection result, and the third detection result indicates that the switch device has a normally open fault.

[0063] In this embodiment, when the difference between the fifth voltage and the sixth voltage is greater than the second preset voltage and the duration is greater than or equal to the second preset duration, it can be determined that only the first capacitor is pre-charged actually, and the second capacitor is not pre-charged, so that the open detection result of the switching device can be determined as the third detection result, and the third detection result indicates that the switching device has an open fault. Since the switching device has an open fault, the switching device cannot be closed, so the second capacitor is not pre-charged.

[0064] In a possible implementation manner, determining the open detection result of the switching device according to the fifth voltage and the sixth voltage includes: When the difference between the fifth voltage and the sixth voltage is less than or equal to the second preset voltage, or the duration of the difference between the fifth voltage and the sixth voltage being greater than the second preset voltage is less than the second preset duration, determining the open detection result of the switching device as the fourth detection result, and the fourth detection result indicates that the switching device has no open fault.

[0065] In this embodiment, when the difference between the fifth voltage and the sixth voltage is less than or equal to the second preset voltage, or the duration of the difference between the fifth voltage and the sixth voltage being greater than the second preset voltage is less than the second preset duration, it indicates that the switching device is closed, so that both the first capacitor and the second capacitor are pre-charged, so that the voltages of the first capacitor and the second capacitor are the same or close, so that the open detection result of the switching device can be determined as the fourth detection result, and the fourth detection result indicates that the switching device has no open fault.

[0066] Figure 3 It is a flowchart of another method for detecting the fault of a switching device shown according to an exemplary embodiment, as Figure 3 [[ID=-14]]shown, and may include the following steps: In step S301, control the switching device to disconnect, and obtain the first voltage of the first capacitor and the second voltage of the second capacitor.

[0067] In step S302, determine whether any one of the first voltage and the second voltage is greater than or equal to the first preset voltage. If so, execute step S303; if not, execute step S304.

[0068] In step S303, determine whether the difference between the first voltage and the second voltage is less than or equal to the second preset voltage. If so, execute step S304; if not, determine that there is no adhesion fault and execute step S305.

[0069] In step S304, control the DCDC reverse charging module to pre-charge the voltage of the first capacitor to the third voltage, obtain the fourth voltage of the second capacitor, and may execute step S305.

[0070] In step S305, it is determined whether the difference between the third voltage and the fourth voltage is less than or equal to the second preset voltage and the duration is greater than or equal to the first preset duration. If so, it can be determined that there is an adhesion fault, and step S308 is executed. If not, it can be determined that there is no adhesion fault, and step S306 is executed.

[0071] In step S306, the DCDC buck-boost module is controlled to pre-charge the voltage of the first capacitor to the fifth voltage, and the sixth voltage of the second capacitor is obtained.

[0072] In step S307, it is determined whether the difference between the fifth voltage and the sixth voltage is greater than the second preset voltage and the duration is greater than or equal to the first preset duration. If so, it is determined that there is an open circuit fault, and step S308 is executed. If not, step S309 is executed.

[0073] In step S308, fault handling is performed. Fault handling can be carried out, such as sending a fault signal, etc.

[0074] In step S309, the switching device is fault-free. In the case of determining that there is no adhesion fault and no open circuit fault, it can be determined that the switching device is fault-free.

[0075] Figure 4 is a block diagram of a fault detection device for a switching device shown according to an exemplary embodiment. Refer to Figure 4 As shown, the fault detection device 400 for the switching device includes a detection module 401. The switching device is arranged in a DCDC buck-boost circuit. The DCDC buck-boost circuit includes a DCDC buck-boost module, a first capacitor, and a second capacitor. The first capacitor and the second capacitor are connected in parallel and then connected to the DCDC buck-boost module. The switching device is connected in series with the second capacitor.

[0076] The detection module 401 is configured to determine a fault detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor.

[0077] Optionally, the fault detection result includes an adhesion detection result; The detection module 401 includes: A first detection sub-module configured to control the switching device to disconnect and determine the adhesion detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor.

[0078] Optionally, the first detection sub-module includes: A first acquisition unit configured to control the switching device to disconnect and acquire a first voltage of the first capacitor and a second voltage of the second capacitor; A second acquisition unit, configured to control the DCDC buck-boost module to pre-charge the voltage of the first capacitor to a third voltage and acquire a fourth voltage of the second capacitor when the first voltage and the second voltage meet a preset condition, where the third voltage is greater than the second voltage; A first determination unit, configured to determine the adhesion detection result of the switching device according to the third voltage and the fourth voltage.

[0079] Optionally, the second acquisition unit includes: A first control sub-unit, configured to control the DCDC buck-boost module to pre-charge the voltage of the first capacitor to a third voltage when both the first voltage and the second voltage are less than a first preset voltage.

[0080] Optionally, the second acquisition unit includes: A second control sub-unit, configured to control the DCDC buck-boost module to pre-charge the voltage of the first capacitor to a third voltage when any one of the first voltage and the second voltage is greater than or equal to the first preset voltage and the difference between the first voltage and the second voltage is less than or equal to a second preset voltage.

[0081] Optionally, the first determination unit includes: A first determination sub-unit, configured to determine that the adhesion detection result of the switching device is a first detection result when the difference between the third voltage and the fourth voltage is less than or equal to the second preset voltage and the duration is greater than or equal to a first preset duration, where the first detection result indicates that the switching device has an adhesion fault, the third voltage is the sum of the second voltage and a third preset voltage, and the third preset voltage is greater than the second preset voltage.

[0082] Optionally, the first determination unit includes: A second determination sub-unit, configured to determine that the adhesion detection result of the switching device is a second detection result when the difference between the third voltage and the fourth voltage is greater than the second preset voltage, or when the duration that the difference between the third voltage and the fourth voltage is less than or equal to the second preset voltage is less than the first preset duration, where the second detection result indicates that the switching device has no adhesion fault, the third voltage is the sum of the second voltage and a third preset voltage, and the third preset voltage is greater than the second preset voltage.

[0083] Optionally, the fault detection device 400 of the switching device further includes: A determination module, configured to determine that the adhesion detection result of the switching device is a second detection result when either the first voltage or the second voltage is greater than or equal to a first preset voltage, and the difference between the first voltage and the second voltage is greater than a second preset voltage, where the second detection result indicates that the switching device has no adhesion fault.

[0084] Optionally, the fault detection result further includes a normally open detection result; The detection module 401 further includes: A second control sub-module, configured to control the switching device to close when the switching device has no adhesion fault, and determine the normally open detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor.

[0085] Optionally, the second detection sub-module includes: A control unit, configured to control the switching device to close, control the DCDC charging-back module to pre-charge the voltage of the first capacitor to a fifth voltage, and obtain a sixth voltage of the second capacitor; A second determination unit, configured to determine the normally open detection result of the switching device according to the fifth voltage and the sixth voltage.

[0086] Optionally, the second determination unit includes: A third determination sub-unit, configured to determine that the normally open detection result of the switching device is a third detection result when the difference between the fifth voltage and the sixth voltage is greater than the second preset voltage and the duration is greater than or equal to a second preset duration, where the third detection result indicates that the switching device has a normally open fault.

[0087] Optionally, the second determination unit includes: A fourth determination sub-unit, configured to determine that the normally open detection result of the switching device is a fourth detection result when the difference between the fifth voltage and the sixth voltage is less than or equal to the second preset voltage, or the duration during which the difference between the fifth voltage and the sixth voltage is greater than the second preset voltage is less than the second preset duration, where the fourth detection result indicates that the switching device has no normally open fault.

[0088] Regarding the fault detection device 400 for the switching device in the above embodiments, the specific manners in which each module performs operations have been described in detail in the embodiments related to the method, and will not be elaborated herein.

[0089] The present disclosure also provides a computer-readable storage medium having computer program instructions stored thereon, and when the program instructions are executed by a processor, the steps of the fault detection method of the switching device provided by the present disclosure are implemented.

[0090] Figure 5 FIG. 4 is a block diagram of another fault detection device for a switching device shown according to an exemplary embodiment. For example, the fault detection device 500 for a switching device may be a vehicle controller or a battery manager.

[0091] Referring to Figure 5 , the fault detection device 500 for a switching device may include one or more of the following components: a first processing component 502, a first memory 504, a first power supply component 506, a multimedia component 508, an audio component 510, a first input / output interface 512, a sensor component 514, and a communication component 516.

[0092] The first processing component 502 generally controls the overall operation of the fault detection device 500 for a switching device, such as operations associated with display, telephone calls, data communication, camera operations, and recording operations. The first processing component 502 may include one or more processors 520 to execute instructions to complete all or part of the steps of the above-mentioned fault detection method of the switching device. In addition, the first processing component 502 may include one or more modules to facilitate the interaction between the first processing component 502 and other components. For example, the first processing component 502 may include a multimedia module to facilitate the interaction between the multimedia component 508 and the first processing component 502.

[0093] The first memory 504 is configured to store various types of data to support the operation of the fault detection device 500 for a switching device. Examples of such data include instructions for any application or method operating on the fault detection device 500 for a switching device, contact data, phone book data, messages, pictures, videos, etc. The first memory 504 may 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 memory, flash memory, a magnetic disk, or an optical disk.

[0094] The first power supply component 506 provides power to various components of the fault detection device 500 for a switching device. The first power supply component 506 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the fault detection device 500 for a switching device.

[0095] The multimedia component 508 includes a screen that provides an output interface between the fault detection device 500 of the switching device 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 touch screen 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 touch or swipe actions but also detect the duration and pressure associated with the touch or swipe operation. In some embodiments, the multimedia component 508 includes a front camera and / or a rear camera. When the fault detection device 500 of the switching device is in an operation mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each of the front camera and the rear camera can be a fixed optical lens system or have a focal length and optical zoom capabilities.

[0096] The audio component 510 is configured to output and / or input audio signals. For example, the audio component 510 includes a microphone (MIC) that is configured to receive external audio signals when the fault detection device 500 of the switching device is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the first memory 504 or transmitted via the communication component 516. In some embodiments, the audio component 510 further includes a speaker for outputting audio signals.

[0097] The first input / output interface 512 provides an interface between the first processing component 502 and a peripheral interface module, and the peripheral interface module can be a keyboard, a click wheel, buttons, etc. These buttons can include but are not limited to: a home button, a volume button, a power button, and a lock button.

[0098] The sensor assembly 514 includes one or more sensors for providing status evaluations in various aspects for the fault detection device 500 of the switching device. For example, the sensor assembly 514 can detect the on / off state of the fault detection device 500 of the switching device, the relative positioning of the components, such as the display and keypad of the fault detection device 500 of the switching device. The sensor assembly 514 can also detect a change in the position of the fault detection device 500 of the switching device or a component of the fault detection device 500 of the switching device, the presence or absence of user contact with the fault detection device 500 of the switching device, the orientation or acceleration / deceleration of the fault detection device 500 of the switching device, and the temperature change of the fault detection device 500 of the switching device. The sensor assembly 514 can include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 514 can also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 514 can also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0099] The communication assembly 516 is configured to facilitate communication between the fault detection device 500 of the switching device and other devices in a wired or wireless manner. The fault detection device 500 of the switching device can access a wireless network based on a communication standard, such as WiFi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication assembly 516 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication assembly 516 further includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0100] In an exemplary embodiment, the fault detection device 500 of the switching device can 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 for performing the above-described fault detection method of the switching device.

[0101] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a first memory 504 including instructions, and the instructions can be executed by a processor 520 of a fault detection device 500 of a switching device to complete the fault detection method of the switching device. For example, the non-transitory computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0102] In another exemplary embodiment, a vehicle is also provided, including the fault detection device of the switching device in the above embodiment, and a DCDC buck-boost circuit in the fault detection method of the switching device in the above embodiment. The DCDC buck-boost module and the switching device in the DCDC buck-boost circuit are both connected to the fault detection device of the switching device.

[0103] In another exemplary embodiment, a computer program product is also provided. The computer program product includes a computer program that can be executed by a programmable device, and the computer program has a code portion for executing the fault detection method of the switching device described above when executed by the programmable device.

[0104] Those skilled in the art can also understand that the various illustrative logical blocks and steps listed in the embodiments of the present application can be implemented by electronic hardware, computer software, or a combination of both. Whether such a function is implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art can use various methods to implement the described function for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of the present application.

[0105] In the above detailed description, terms indicating directions or representing positional relationships, such as "center", "upper", "lower", "left", "right", etc. Since the components of the described device can be positioned in multiple different orientations, the direction terms can be used for illustrative purposes and are not restrictive. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concept of the present disclosure. Therefore, the following detailed description should not be construed in a limiting sense.

[0106] It should be understood that unless otherwise specifically indicated, the features of the various embodiments of the present disclosure described herein can be combined with each other. [[ID=,16]]

[0107] Although terms such as "first", "second", and "third" may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited to these terms. On the contrary, these terms are only used to distinguish one component, part, region, layer, or section from another. Thus, the first component, part, region, layer, or section mentioned in the examples described herein may also be referred to as the second component, part, region, layer, or section without departing from the teachings of the respective examples. Additionally, 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description herein, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0108] In addition, the word "exemplary" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "exemplary" is not necessarily to be construed as being advantageous compared to other aspects or designs. Instead, the use of the word exemplary is intended to present concepts in a concrete fashion. As used herein, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless otherwise specified, or clear from the context, "X applies A or B" is intended to mean any of the natural inclusive permutations. That is, if X applies A; X applies B; or X applies both A and B, then "X applies A or B" is satisfied in any of the foregoing instances. Additionally, unless otherwise specified or clear from the context referring to the singular form, the articles "a" and "an" as used in this application and the appended claims are generally understood to mean "one or more".

[0109] Similarly, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. Specifically with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if not structurally equivalent to the disclosed structure. Additionally, although a particular feature of the present disclosure may have been disclosed with respect to only one of several implementations, such a feature may, as may be desired and advantageous for any given or particular application, be combined with one or more other features of other implementations. Further, with respect to the use of "comprises," "comprising," "has," "having," "includes," or "including" in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term "including."

[0110] Other embodiments of the present disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

[0111] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A fault detection method for a switching device, characterized in that, The switching device is arranged in the DCDC buck-boost charging circuit. The DCDC buck-boost charging circuit includes a DCDC buck-boost charging module, a first capacitor, and a second capacitor. The first capacitor and the second capacitor are connected in parallel and then connected to the DCDC buck-boost charging module. The switching device is connected in series with the second capacitor. The method includes: Determine a fault detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor.

2. The fault detection method of the switching device according to claim 1, wherein The fault detection result includes an adhesion detection result; The step of determining a fault detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor includes: Control the switching device to disconnect, and determine the adhesion detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor.

3. The fault detection method of the switching device according to claim 2, wherein: The step of controlling the switching device to disconnect and determining the adhesion detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor includes: Control the switching device to disconnect, and obtain a first voltage of the first capacitor and a second voltage of the second capacitor; When the first voltage and the second voltage meet a preset condition, control the DCDC buck-boost charging module to pre-charge the voltage of the first capacitor to a third voltage, and obtain a fourth voltage of the second capacitor. The third voltage is greater than the second voltage; Determine the adhesion detection result of the switching device according to the third voltage and the fourth voltage.

4. The fault detection method of the switching device according to claim 3, wherein: The step of, when the first voltage and the second voltage meet a preset condition, controlling the DCDC buck-boost charging module to pre-charge the voltage of the first capacitor to a third voltage includes: When both the first voltage and the second voltage are less than a first preset voltage, control the DCDC buck-boost charging module to pre-charge the voltage of the first capacitor to the third voltage.

5. The fault detection method of the switching device according to claim 3, wherein: The step of, when the first voltage and the second voltage meet a preset condition, controlling the DCDC buck-boost charging module to pre-charge the voltage of the first capacitor to a third voltage includes: When either of the first voltage and the second voltage is greater than or equal to the first preset voltage and the difference between the first voltage and the second voltage is less than or equal to a second preset voltage, control the DCDC buck-boost charging module to pre-charge the voltage of the first capacitor to the third voltage.

6. The fault detection method of the switching device according to claim 3, wherein: The step of determining the adhesion detection result of the switching device according to the third voltage and the fourth voltage includes: When the difference between the third voltage and the fourth voltage is less than or equal to a second preset voltage and the duration is greater than or equal to a first preset duration, determine that the adhesion detection result of the switching device is a first detection result, where the first detection result indicates that the switching device has an adhesion fault. The third voltage is the sum of the second voltage and a third preset voltage, and the third preset voltage is greater than the second preset voltage.

7. The method for detecting a fault of a switching device according to claim 3, wherein determining the adhesion detection result of the switching device according to the third voltage and the fourth voltage includes: When the difference between the third voltage and the fourth voltage is greater than the second preset voltage, or when the duration of the difference between the third voltage and the fourth voltage being less than or equal to the second preset voltage is less than the first preset duration, determine that the adhesion detection result of the switching device is a second detection result, where the second detection result indicates that the switching device has no adhesion fault. The third voltage is the sum of the second voltage and a third preset voltage, and the third preset voltage is greater than the second preset voltage.

8. The fault detection method of the switching device according to claim 3, characterized in that, The method further includes: When any one of the first voltage and the second voltage is greater than or equal to a first preset voltage and the difference between the first voltage and the second voltage is greater than the second preset voltage, determine that the adhesion detection result of the switching device is a second detection result, where the second detection result indicates that the switching device has no adhesion fault.

9. The fault detection method of the switching device according to claim 7 or 8, characterized in that, The fault detection result further includes a normally open detection result; determining the fault detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor further includes: When the switching device has no adhesion fault, control the switching device to close, and determine the normally open detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor.

10. The method for detecting a fault of a switching device according to claim 9, wherein controlling the switching device to close and determining the normally open detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor includes: control the switching device to close, and control the DCDC recharge module to pre-charge the voltage of the first capacitor to a fifth voltage, and obtain the sixth voltage of the second capacitor; Determine the normally open detection result of the switching device according to the fifth voltage and the sixth voltage.

11. The method for detecting a fault of a switching device according to claim 10, wherein determining the normally open detection result of the switching device according to the fifth voltage and the sixth voltage includes: When the difference between the fifth voltage and the sixth voltage is greater than the second preset voltage and the duration is greater than or equal to a second preset duration, determine that the normally open detection result of the switching device is a third detection result, where the third detection result indicates that the switching device has a normally open fault.

12. The method for detecting a fault of a switching device according to claim 10, wherein Determining the normally open detection result of the switching device according to the fifth voltage and the sixth voltage includes: When the difference between the fifth voltage and the sixth voltage is less than or equal to a second preset voltage, or the duration for which the difference between the fifth voltage and the sixth voltage is greater than the second preset voltage is less than a second preset duration, determining that the normally open detection result of the switching device is a fourth detection result, where the fourth detection result indicates that there is no normally open fault in the switching device.

13. A fault detection device for a switching device, characterized in that, The switching device is arranged in a DCDC buck-boost circuit, and the DCDC buck-boost circuit includes a DCDC buck-boost module, a first capacitor, and a second capacitor. The first capacitor and the second capacitor are connected in parallel and then connected to the DCDC buck-boost module. The switching device is connected in series with the second capacitor. The apparatus includes: A detection module configured to determine a fault detection result of the switching device according to the voltage of the first capacitor and the voltage of the second capacitor.

14. A fault detection device for a switching device, characterized in that, including: A processor; A memory for storing processor-executable instructions; Wherein, the processor is configured to implement the steps of the fault detection method of the switching device according to any one of claims 1 to 12 when executed.

15. A vehicle, characterized in that, A fault detection apparatus for a switching device according to claim 14, and a DCDC buck-boost circuit in the fault detection method of the switching device according to any one of claims 1 to 12, where the DCDC buck-boost module and the switching device in the DCDC buck-boost circuit are both connected to the fault detection apparatus for the switching device.

16. A computer-readable storage medium having computer program instructions stored thereon, characterized in that, When the computer program instructions are executed by the processor, the steps of the fault detection method of the switching device according to any one of claims 1 to 12 are implemented.

17. A computer program product, characterized in that, Including a computer program, when the computer program is executed by the processor, the steps of the fault detection method of the switching device according to any one of claims 1 to 12 are implemented.

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