Insulation fault diagnosis system of fuel cell system, fuel cell system and vehicle

Abstract

The utility model relates to the technical field of fuel cells, in particular to an insulation fault diagnosis system of a fuel cell system, the fuel cell system and a vehicle. The diagnosis system comprises a troubleshooting assembly which is provided with a plurality of troubleshooting nodes and is used for adjusting the connection state between the plurality of troubleshooting nodes and a plurality of to-be-troubleshot points according to the current troubleshooting requirement; and the control assembly is respectively connected with the plurality of troubleshooting nodes and is used for sending a current troubleshooting demand to the troubleshooting assembly and determining parts in an insulation failure state in the fuel cell system according to the troubleshooting result of each to-be-troubleshot point after the troubleshooting assembly adjusts the connection state between the plurality of troubleshooting nodes and the plurality of to-be-troubleshot points. Therefore, by means of the insulation fault diagnosis system, the problems that in the prior art, when insulation fault diagnosis is carried out, specific fault parts cannot be automatically positioned, and insulation faults caused by high-voltage loop failure or cooling loop failure cannot be distinguished can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, and in particular to an insulation fault diagnosis system of a fuel cell system, a fuel cell system and a vehicle. Background Art

[0002] A fuel cell is an energy conversion device that directly converts the chemical energy in the fuel oxidant into electrical energy through an electrochemical reaction. Taking hydrogen-oxygen fuel cells as an example, the product is water. Because of its high energy utilization rate and pollution-free characteristics, it is known as the ultimate energy source for new energy vehicles. At present, new energy battery vehicles mainly adopt an electric-electric hybrid mode, that is, they are driven by a combination of fuel cells and power batteries. The voltage platform of the power battery is generally 500V (high-voltage platform), so the insulation requirements are relatively high. Among them, the insulation resistance of the fuel cell system is mainly affected by the conductivity of the fuel cell cooling circuit, the layout of the cooling circuit pipeline, the insulation state of the cooling circuit components, and the insulation state of the high-voltage components. At present, fuel cell insulation failures are generally caused by high conductivity. In order to avoid the harm caused by low insulation, the whole vehicle will perform real-time insulation detection when the vehicle is started.

[0003] In the related technologies, (1) the insulation value of the fuel cell system can be monitored by an insulation tester, and the conductivity of the fuel cell system cooling circuit can be monitored by a conductivity meter. Based on the data of these two, it can be determined whether there is an insulation fault in the internal components of the fuel cell system; (2) the insulation value can be theoretically calculated by building an insulation model, and the fault threshold of insulation failure can be determined by grounding the component casing.

[0004] However, method (1) cannot automatically locate the specific faulty component when performing insulation fault diagnosis, and further manual testing is required to locate the component with insulation failure; method (2) is prone to misjudgment when locating insulation faults and cannot distinguish whether the insulation fault is caused by high-voltage circuit failure or cooling circuit failure, which needs to be solved urgently. Utility Model Content

[0005] The utility model provides an insulation fault diagnosis system for a fuel cell system, a fuel cell system and a vehicle, so as to solve the problems that the prior art cannot automatically locate the specific faulty component when performing insulation fault diagnosis, and cannot distinguish whether the insulation fault is caused by a high-voltage circuit failure or a cooling circuit failure, accurately locate the source of the insulation problem, reduce the problem locating time, and improve service efficiency.

[0006] To achieve the above-mentioned purpose, the first embodiment of the utility model provides an insulation fault diagnosis system for a fuel cell system, including: a fault troubleshooting component and a control component, wherein:

[0007] The fault troubleshooting component includes a plurality of troubleshooting nodes, each of which is connected to a plurality of to-be-troubleshooted points of the fuel cell system in a one-to-one correspondence, and is used to adjust the connection status between the plurality of troubleshooting nodes and the plurality of to-be-troubleshooted points according to the current troubleshooting requirements;

[0008] The control component is respectively connected to the multiple troubleshooting nodes, and is used to send the current troubleshooting requirement to the fault troubleshooting component, and after the fault troubleshooting component adjusts the connection status between the multiple troubleshooting nodes and the multiple points to be troubleshooted based on the current troubleshooting requirement, the components in the fuel cell system that are in an insulation failure state are determined according to the troubleshooting results of each point to be troubleshooted.

[0009] According to one embodiment of the utility model, the fault troubleshooting component includes:

[0010] A switch matrix, one end of which is connected to the control component, and the other end of which is connected to the multiple points to be checked of the fuel cell system through the multiple check nodes in a one-to-one correspondence, the switch matrix having multiple switch states, the multiple switch states corresponding to multiple check requirements, and the switch matrix adjusting the connection states between the multiple check nodes and the multiple points to be checked according to the current check requirements;

[0011] a failure detection unit, one end of which is connected to one end of the switch matrix, and the other end of which is connected to a ground node, and the failure detection unit is used to detect components in a functional failure state in the fuel cell system;

[0012] An insulation detection unit, one end of which is respectively connected to one end of the switch matrix and one end of the failure detection unit, and the other end of which is connected to the ground node, and the insulation detection unit is used to detect components in the fuel cell system that are in the insulation failure state.

[0013] According to an embodiment of the present utility model, the switch matrix comprises: first to Nth switches, wherein:

[0014] One end of the first to Nth switches is connected to one end of the failure detection unit and one end of the insulation detection unit, the other end of the first to Nth switches is connected one-to-one with the multiple troubleshooting points of the fuel cell system through the multiple troubleshooting nodes, and the control ends of the first to Nth switches are respectively connected to the control components.

[0015] According to an embodiment of the present utility model, the failure detection unit includes:

[0016] a first resistor, one end of which is connected to the ground node;

[0017] an N+1th switch, one end of the N+1th switch is connected to the other end of the first resistor, the other end of the N+1th switch is connected to one end of the first to Nth switches, and a control end of the N+1th switch is connected to the control component.

[0018] According to one embodiment of the utility model, the insulation detection unit includes:

[0019] a second resistor, one end of the second resistor being connected to the ground node;

[0020] an N+2th switch, one end of the N+2th switch is connected to the other end of the second resistor, the other end of the N+2th switch is connected to one end of the first to Nth switches, and a control end of the N+2th switch is connected to the control component.

[0021] According to one embodiment of the present utility model, the control component includes:

[0022] The first to M+2th control units are respectively connected to one end of the first to N+2th switches in a one-to-one correspondence.

[0023] According to an embodiment of the present invention, the first to N+2 th switches are MOS tubes.

[0024] According to one embodiment of the utility model, the insulation fault diagnosis system of the fuel cell system further includes:

[0025] A display component is connected to the control component and is used to display components in the fuel cell system that are in an insulation failure state.

[0026] According to the insulation fault diagnosis system of the fuel cell system proposed in the embodiment of the utility model, the fault troubleshooting component adjusts the connection status between multiple troubleshooting nodes and multiple points to be checked according to the current troubleshooting requirements; the control component sends the current troubleshooting requirements to the fault troubleshooting component, and after the fault troubleshooting component adjusts the connection status between multiple troubleshooting nodes and multiple points to be checked, the components in the fuel cell system that are in an insulation failure state are determined according to the troubleshooting results of each point to be checked. Therefore, the insulation fault diagnosis system can solve the problem that the existing technology cannot automatically locate the specific faulty components when performing insulation fault diagnosis, and cannot distinguish whether the insulation fault is caused by high-voltage circuit failure or cooling circuit failure, accurately locate the source of the insulation problem, reduce the problem location time, and improve service efficiency.

[0027] To achieve the above-mentioned object, a second embodiment of the present invention provides a fuel cell system, which includes the insulation fault diagnosis system of the fuel cell system as described in the first embodiment.

[0028] In order to achieve the above-mentioned objective, a third aspect of the present invention provides a vehicle, which includes a fuel cell system as described in the third aspect of the present invention.

[0029] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0031] Figure 1 A block diagram of an insulation fault diagnosis system for a fuel cell system provided according to an embodiment of the utility model;

[0032] Figure 2 A schematic diagram of a fuel cell system architecture according to an embodiment of the utility model;

[0033] Figure 3 is a schematic diagram of an equivalent circuit of a fuel cell system architecture according to an embodiment of the utility model;

[0034] Figure 4 It is a structural schematic diagram of a fault troubleshooting component according to an embodiment of the utility model;

[0035] Figure 5 It is a schematic diagram of the electrical framework of a fuel cell system according to an embodiment of the utility model. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0037] The insulation fault diagnosis system of the fuel cell system, the fuel cell system and the vehicle according to the embodiments of the present utility model are described below with reference to the accompanying drawings.

[0038] Figure 1 It is a block diagram of an insulation fault diagnosis system for a fuel cell system according to an embodiment of the utility model.

[0039] Before introducing the insulation fault diagnosis system of the fuel cell system proposed in the embodiment of the present utility model, an exemplary system architecture of the embodiment of the present utility model is first introduced.

[0040] For example, if Figure 2 As shown, the fuel cell system architecture of the embodiment of the utility model may include: insulation 101 from the positive and negative electrodes of the stack module to the grounding point, pipes 112 from the stack to the thermostat, insulation 103 from the positive and negative electrodes of the thermostat to the water inlet, pipes 122 from the thermostat to the PTC (Positive Temperature Coefficient Thermistor), insulation 106 from the positive and negative electrodes of the PTC to the grounding point, pipes 113 from the thermostat to the diverter port 1, pipes 115 from the diverter port 1 to the intercooler, pipes 114 from the diverter port 1 to the radiator, insulation 109 from the radiator high voltage to the ground, pipes 116 from the intercooler to the confluence port 2, pipes 117 from the radiator to the confluence port 2, and pipes 118 from the confluence port 2 to the confluence port 2. Pipeline 119 of flow outlet 3, pipeline 118 from PTC to confluence outlet 3, pipeline 120 from confluence outlet 3 to water pump, insulation 111 from positive and negative poles of water pump to grounding point, pipeline 121 from water pump to battery stack, battery stack interface pipeline to be checked point 102, thermostat interface pipeline to be checked point 104, PTC interface pipeline to be checked point 105, radiator interface pipeline to be checked point 108 and water pump interface pipeline to be checked point 110.

[0041] according to Figure 2 Draw the equivalent circuit diagram based on the actual connection form of different components and the location of grounding points. Figure 3 As shown, it includes: insulation resistance R101 from the positive and negative electrodes of the battery stack module to the grounding point, equivalent resistance R112 from the battery stack to the thermostat, insulation resistance R103 from the positive and negative electrodes of the thermostat to the water inlet, equivalent resistance R122 from the thermostat to the PTC, insulation resistance R106 from the positive and negative electrodes of the PTC to the grounding point, equivalent resistance R113 from the thermostat to the diversion port 1, equivalent resistance R115 from the diversion port 1 to the intercooler, equivalent resistance R114 from the diversion port 1 to the radiator, insulation resistance R109 from the radiator high voltage to the ground, equivalent resistance R116 from the intercooler to the confluence port 2, radiator to The pipeline equivalent resistance R117 of confluence 2, the pipeline equivalent resistance R119 from confluence 2 to confluence 3, the pipeline equivalent resistance R118 from PTC to confluence 3, the pipeline equivalent resistance R120 from confluence 3 to water pump, the insulation resistance R111 from the positive and negative poles of the water pump to the grounding point, the pipeline equivalent resistance R121 from the water pump to the battery stack, the resistance R102 at the battery stack interface pipeline to be checked, the resistance R104 at the thermostat interface pipeline to be checked, the resistance R105 at the PTC interface pipeline to be checked, the resistance R108 at the radiator interface pipeline to be checked and the resistance R110 at the water pump interface pipeline to be checked.

[0042] For example, Figure 1 As shown, the insulation fault diagnosis system 10 of the fuel cell system includes: a fault troubleshooting component 100 and a control component 200. The fault troubleshooting component 100 includes a plurality of troubleshooting nodes, which are respectively connected to a plurality of troubleshooting points of the fuel cell system in a one-to-one correspondence, and are used to adjust the connection status between the plurality of troubleshooting nodes and the plurality of troubleshooting points according to the current troubleshooting requirements; the control component 200 is respectively connected to the plurality of troubleshooting nodes, and is used to send the current troubleshooting requirements to the fault troubleshooting component 100, and after the fault troubleshooting component 100 adjusts the connection status between the plurality of troubleshooting nodes and the plurality of troubleshooting points based on the current troubleshooting requirements, the components in the fuel cell system that are in an insulation failure state are determined according to the troubleshooting results of each troubleshooting point.

[0043] Specifically, the embodiment of the utility model can check the insulation fault conditions of all components in the fuel cell system one by one through the fault checking component 100, that is, when there is an insulation failure fault in the fuel cell system, the connection status (such as closed, disconnected) between multiple checking nodes and multiple points to be checked can be adjusted according to the current troubleshooting requirements by the troubleshooting component 100 to check the insulation fault conditions of each component in the cooling circuit, so as to confirm whether the insulation of the cooling circuit fails, and lock the components in the cooling circuit that are in the insulation failure state when the insulation of the cooling circuit fails. If the cooling circuit is normal, the connection status between multiple checking nodes and multiple points to be checked can be further adjusted according to the current troubleshooting requirements by the troubleshooting component 100 to check the insulation of each component in the high-voltage circuit. The fault situation is checked to confirm whether the insulation of the high-voltage circuit fails, and the components in the high-voltage circuit that are in the insulation failure state are locked when the insulation of the high-voltage circuit fails; the control component 200 is a controller, which is connected to multiple troubleshooting nodes in the fault troubleshooting component 100. According to the preset troubleshooting strategy (such as troubleshooting one by one), the current troubleshooting requirements can be generated and sent to the fault troubleshooting component 100. These requirements may include the components that need to be troubleshooted, the backward order of troubleshooting, etc. After the fault troubleshooting component 100 adjusts the connection status between the troubleshooting node and the point to be troubleshooted based on the current troubleshooting requirements, the control component 200 can collect the troubleshooting results of each component. By analyzing and processing these results, the control component 200 can determine which components in the fuel cell system are in the insulation failure state.

[0044] For ease of understanding, the troubleshooting component 100 is described in detail below.

[0045] Optionally, in some embodiments, the fault troubleshooting component 100 includes: a switch matrix 1001, a failure detection unit 1002 and an insulation monitoring unit 1003, wherein one end of the switch matrix 1001 is connected to the control component 200, and the other end of the switch matrix 1001 is connected to multiple troubleshooting points of the fuel cell system through multiple troubleshooting nodes in a one-to-one correspondence, and the switch matrix 1001 has multiple switch states, and the multiple switch states correspond to multiple troubleshooting requirements. The switch matrix 1001 adjusts the connection between the multiple troubleshooting nodes and the multiple troubleshooting points according to the current troubleshooting requirements. one end of the failure detection unit 1002 is connected to one end of the switch matrix 1001, and the other end of the failure detection unit 1002 is connected to the ground node, and the failure detection unit 1002 is used to detect components in the fuel cell system that are in a functional failure state; one end of the insulation detection unit 1003 is respectively connected to one end of the switch matrix 1001 and one end of the failure detection unit 1002, and the other end of the insulation detection unit 1003 is connected to the ground node, and the insulation detection unit 1003 is used to detect components in the fuel cell system that are in an insulation failure state.

[0046] That is to say, the switch matrix 1001 has multiple switch states, which correspond to different troubleshooting requirements. According to the current troubleshooting requirements, the switch matrix 1001 can adjust the connection status between multiple troubleshooting nodes and multiple points to be checked, so as to realize various troubleshooting strategies; the failure detection unit 1002 can determine which components have functional failures by measuring the electrical parameters (such as resistance, etc.) between the grounding node; the insulation monitoring unit 1003 can further determine whether the insulation failure of the component with functional failure occurs by real-time monitoring of parameters such as the insulation resistance between the grounding node.

[0047] In some embodiments, the switch matrix 1001 includes: first to Nth switches, wherein one end of the first to Nth switches is connected to one end of the failure detection unit 1002 and one end of the insulation detection unit 1003, and the other ends of the first to Nth switches are connected one-to-one with multiple troubleshooting points of the fuel cell system through multiple troubleshooting nodes, and the control ends of the first to Nth switches are respectively connected to the control component 200.

[0048] For example, if Figure 4As shown, the switch matrix 1001 may include a first switch K1, a second switch K2, a third switch K3, a fourth switch K4 and a fifth switch K5, wherein one end of each of the first to fifth switches K1 to K5 is connected to one end of the failure detection unit 1002 and one end of the insulation detection unit 1003, and the other ends of the first to fifth switches K1 to K5 are connected to a plurality of to-be-checked points of the fuel cell system through a plurality of check nodes in a one-to-one correspondence, that is, the first switch K1 is connected to the to-be-checked point resistor R110 of the water pump interface pipeline through the check node, and the second switch K2 is connected to the to-be-checked point resistor R110 of the water pump interface pipeline through the check node. The third switch K3 is connected to the resistor R105 at the point to be checked in the PTC interface pipeline through the troubleshooting node, the fourth switch K4 is connected to the resistor R108 at the point to be checked in the radiator interface pipeline through the troubleshooting node, the fifth switch K5 is connected to the resistor R104 at the point to be checked in the thermostat interface pipeline through the troubleshooting node, and the control ends of the first to fifth switches K1~K5 are respectively connected to the control component 200, and the first to fifth switches K1~K5 are selected and controlled by the control component 200.

[0049] Optionally, in some embodiments, the failure detection unit 1002 includes: a first resistor R1 and an N+1th switch, one end of the first resistor R1 is connected to the ground node; one end of the N+1th switch is connected to the other end of the first resistor R1, the other end of the N+1th switch is connected to one end of the first to Nth switches, and the control end of the N+1th switch is connected to the control component 200.

[0050] For example, if Figure 4 As shown, the failure detection unit 1002 may include a first resistor R1 and a sixth switch K6, wherein the first resistor R1 is a low-resistance resistor, one end of the first resistor R1 is connected to the ground node, and is used to detect whether there are components in a functional failure state in the cooling circuit of the fuel cell system, one end of the sixth switch K6 is connected to the other end of the first resistor R1, the other end of the sixth switch K6 is connected to one end of the first to fifth switches K1~K5, and the control end of the sixth switch K6 is connected to the control component 200, and the sixth switch K6 is controlled to be on and off by the control component 200.

[0051] It can be understood that the first resistor R1 (low-resistance resistor) is mainly used to preliminarily check the functional failure of cooling circuit components. When the resistance value of the first resistor R1 is detected to be abnormal, it can be preliminarily determined that the component stack in the cooling circuit has failed.

[0052] Optionally, in some embodiments, the insulation detection unit 1003 includes: a second resistor R2 and an N+2th switch, one end of the second resistor R2 is connected to the ground node; one end of the N+2th switch is connected to the other end of the second resistor R2, the other end of the N+2th switch is connected to one end of the first to Nth switches, and the control end of the N+2th switch is connected to the control component 200.

[0053] For example, if Figure 4 As shown, the insulation detection unit 1003 may include a second resistor R2 and a seventh switch K7, wherein the second resistor R2 is a high-resistance resistor, one end of the second resistor R2 is connected to the ground node, and is used to detect whether there are components in the cooling circuit of the fuel cell system that are in an insulation failure state, one end of the seventh switch K7 is connected to the other end of the second resistor R2, the other end of the seventh switch K7 is connected to one end of the first to fifth switches K1~K5, and the control end of the seventh switch K7 is connected to the control component 200, and the seventh switch K7 is controlled to be on and off by the control component 200.

[0054] It can be understood that after preliminarily determining that there are functionally failed components in the cooling circuit through the first resistor R1, the second resistor R2 (high-resistance resistor) can be used to further check whether the functionally failed components are in an insulation failure state. When the resistance value of the second resistor R2 is detected to be abnormal, it can be determined that the insulation fault is an insulation failure of the cooling circuit.

[0055] Among them, the first resistor R1 and the second resistor R2 are both grounding resistors, and a metal groundable troubleshooting node is set at the port of the cooling circuit component to connect the first resistor R1 and the second resistor R2 to determine the insulation failure of the cooling circuit component.

[0056] The following describes in detail how to perform insulation failure fault diagnosis based on the fault detection component 100.

[0057] Specifically, Figure 5A schematic diagram of an exemplary fuel cell system electrical framework of an embodiment of the utility model is proposed, including: a fuel cell system and a power battery, wherein the fuel cell system includes a fuel cell stack, a fuel cell system power distribution unit, a PTC heater, a water pump and a heat dissipation system. When the current insulation value of the fuel cell system detected by the insulation detector is less than or equal to the preset fault insulation value, it indicates that there is an insulation fault in the fuel cell system. After the fault is triggered, it is first confirmed whether there is an insulation failure fault in the cooling circuit. First, a component of the cooling circuit (such as the stack) is selected, and then the sixth switch K6 is controlled to be closed and its insulation value is detected through the control component 200. When the insulation value of the first resistor R1 is detected to be abnormal (such as the insulation value of the first resistor R1 is close to or the same as the current insulation value of the fuel cell system detected above (that is, the deviation does not exceed 10%)), it can be preliminarily determined that the component in the cooling circuit (such as the stack) is in a functional failure state. The seventh switch K7 is further controlled to be closed and its insulation value is detected through the control component 200. When the insulation value of the second resistor R2 is detected to be abnormal (such as the insulation value of the second resistor R2 is close to or the same as the current insulation value of the fuel cell system detected above (that is, the deviation does not exceed 10%)), then it can be determined that the insulation fault of the fuel cell system is the insulation failure of the cooling circuit, and the specific component with insulation failure is the stack. Similarly, the next component can be selected to perform insulation fault detection in sequence until all components in the cooling circuit are confirmed to be completed.

[0058] If all components in the cooling circuit have been confirmed to have no insulation failure in the cooling circuit, it is determined that the insulation failure in the cooling circuit does not exist. It is then further determined whether the insulation failure in the high-voltage circuit exists.

[0059] Furthermore, each component in the high-voltage circuit can be troubleshooted in turn through the troubleshooting component. For example, the water pump high-voltage connector is disconnected first, and the first switch K1 is controlled to be disconnected through the control component 200, and the insulation value of the resistance R110 at the point to be checked in the water pump interface pipeline is detected. If the insulation value of the resistance R110 at the point to be checked in the water pump interface pipeline is close to or the same as the current insulation value of the fuel cell system detected above (that is, the deviation does not exceed 10%), it is determined that the water pump has an insulation failure fault; otherwise, the water pump high-voltage connector is restored, the PTC high-voltage connector is disconnected, and the second switch K2 is controlled to be disconnected through the control component 200, and the insulation value of the resistance R105 at the point to be checked in the PTC interface pipeline is detected. If the insulation value of the resistance R105 at the point to be checked in the PTC interface pipeline is close to or the same as the current insulation value of the fuel cell system detected above, it is determined that the PTC has a fault. In case of insulation failure; otherwise, restore the PTC high-voltage connector, disconnect the radiator high-voltage connector, control the fourth switch K4 to be disconnected through the control component 200, detect the insulation value of the resistance R108 at the point to be checked in the radiator interface pipeline, if the insulation value of the resistance R108 at the point to be checked in the radiator interface pipeline is close to or the same as the current insulation value of the fuel cell system detected above, it is determined that there is an insulation fault in the radiator; otherwise, restore the radiator connector, disconnect the thermostat high-voltage connector, control the fifth switch K5 to be disconnected through the control component 200, detect the insulation value of the resistance R104 at the point to be checked in the thermostat interface pipeline, if the insulation value of the resistance R104 at the point to be checked in the thermostat interface pipeline is close to or the same as the current insulation value of the fuel cell system detected above, it is determined that there is an insulation fault in the thermostat; otherwise, directly determine that there is an insulation failure fault inside the fuel cell system DCDC (Direct Current-Direct Current, converter).

[0060] Therefore, when an insulation failure occurs in the fuel cell system, it is possible to accurately identify whether the insulation failure of the fuel cell system is caused by insulation failure in the cooling circuit or insulation failure in the high-voltage circuit, and after the insulation failure, it is also possible to accurately identify whether the insulation failure occurs in the internal insulation of the fuel cell system distribution unit or in the stack insulation.

[0061] Optionally, in some embodiments, the control component 200 includes: first to M+2th control units, and the first to M+2th control units are respectively connected to one end of the first to N+2th switches in a one-to-one correspondence.

[0062] For example, if Figure 4As shown, the control component 200 may include multiple control units (such as the first to seventh control units C1~C7), each control unit is respectively connected to the first to fifth switches K1~K5 in the switch matrix 1001, and one end of the sixth switch K6 in the failure detection unit 1002 and the seventh switch K7 in the insulation detection unit in a one-to-one correspondence to control the connection state of the switch.

[0063] Optionally, in some embodiments, the first to N+2 th switches are MOS tubes.

[0064] It can be understood that a MOS tube is an electronic switch that controls current through voltage. It includes three electrodes: source, gate, and drain. When an appropriate voltage is applied to the gate, it can form a conductive channel between the source and drain, allowing current to pass. In combination with low-resistance and high-resistance test methods, MOS tubes can be used to detect and isolate faulty components. For example, by controlling the switching state of a specific MOS tube, the resistance and insulation performance of the relevant components can be tested.

[0065] Optionally, in some embodiments, Figure 4 As shown, the fuel cell system insulation fault diagnosis system 10 further includes: a display component 300, which is connected to the control component 200 and is used to display components in the fuel cell system that are in an insulation failure state.

[0066] That is to say, in the present invention, the display component 300 can display the names, locations, etc. of these components on the interface based on the information of the components that are determined to be in a state of insulation failure, so that the operator can intuitively understand which parts of the fuel cell system have problems and take corresponding maintenance or replacement measures in a timely manner.

[0067] According to the insulation fault diagnosis system of the fuel cell system proposed in the embodiment of the utility model, the fault troubleshooting component adjusts the connection status between multiple troubleshooting nodes and multiple points to be checked according to the current troubleshooting requirements; the control component sends the current troubleshooting requirements to the fault troubleshooting component, and after the fault troubleshooting component adjusts the connection status between multiple troubleshooting nodes and multiple points to be checked, the components in the fuel cell system that are in an insulation failure state are determined according to the troubleshooting results of each point to be checked. Therefore, the insulation fault diagnosis system can solve the problem that the existing technology cannot automatically locate the specific faulty components when performing insulation fault diagnosis, and cannot distinguish whether the insulation fault is caused by high-voltage circuit failure or cooling circuit failure, accurately locate the source of the insulation problem, reduce the problem location time, and improve service efficiency.

[0068] Secondly, an embodiment of the utility model provides a fuel cell system, which includes the insulation fault diagnosis system of the fuel cell system mentioned above.

[0069] According to the fuel cell system proposed in the embodiment of the utility model, through the insulation fault diagnosis system of the above-mentioned fuel cell system, it is possible to solve the problems that the prior art cannot automatically locate the specific faulty components when diagnosing insulation faults, and cannot distinguish whether the insulation fault is caused by failure of the high-voltage circuit or failure of the cooling circuit, accurately locate the source of the insulation problem, reduce the problem locating time, and improve service efficiency.

[0070] An embodiment of the utility model further provides a vehicle, which includes the above-mentioned fuel cell system.

[0071] The vehicle proposed in the embodiment of the utility model, through the above-mentioned fuel cell system, can solve the problem that the prior art cannot automatically locate the specific faulty components when diagnosing insulation faults, and cannot distinguish whether the insulation fault is caused by failure of the high-voltage circuit or failure of the cooling circuit, accurately locate the source of the insulation problem, reduce the problem locating time, and improve service efficiency.

[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0074] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An insulation fault diagnosis system for a fuel cell system, characterized in that: include: A troubleshooting component (100) and a control component (200), wherein: The fault troubleshooting component (100) comprises a plurality of troubleshooting nodes, each of which is connected to a plurality of points to be troubleshooted of the fuel cell system in a one-to-one correspondence, and is used to adjust the connection status between the plurality of troubleshooting nodes and the plurality of points to be troubleshooted according to current troubleshooting requirements; The control component (200) is respectively connected to the multiple troubleshooting nodes, and is used to send the current troubleshooting requirement to the fault troubleshooting component (100), and after the fault troubleshooting component (100) adjusts the connection status between the multiple troubleshooting nodes and the multiple points to be troubleshooted based on the current troubleshooting requirement, the component in the fuel cell system that is in an insulation failure state is determined according to the troubleshooting result of each point to be troubleshooted.

2. The insulation fault diagnosis system of the fuel cell system according to claim 1, characterized in that: The fault troubleshooting component (100) comprises: A switch matrix (1001), one end of the switch matrix (1001) is connected to the control component (200), the other end of the switch matrix (1001) is connected to the multiple points to be checked of the fuel cell system through the multiple check nodes in a one-to-one correspondence, the switch matrix (1001) has multiple switch states, the multiple switch states correspond to multiple check requirements, and the switch matrix (1001) adjusts the connection state between the multiple check nodes and the multiple points to be checked according to the current check requirements; a failure detection unit (1002), one end of the failure detection unit (1002) being connected to one end of the switch matrix (1001), and the other end of the failure detection unit (1002) being connected to a ground node, and the failure detection unit (1002) being used to detect components in a functional failure state in the fuel cell system; An insulation detection unit (1003), one end of the insulation detection unit (1003) is respectively connected to one end of the switch matrix (1001) and one end of the failure detection unit (1002), and the other end of the insulation detection unit (1003) is connected to the ground node. The insulation detection unit (1003) is used to detect components in the fuel cell system that are in the insulation failure state.

3. The insulation fault diagnosis system of the fuel cell system according to claim 2, characterized in that: The switch matrix (1001) comprises: first to Nth switches, wherein: One end of each of the first to Nth switches is connected to one end of the failure detection unit (1002) and one end of the insulation detection unit (1003); the other end of each of the first to Nth switches is connected one-to-one with a plurality of points to be checked in the fuel cell system through the plurality of check nodes; and the control ends of the first to Nth switches are respectively connected to the control component (200).

4. The insulation fault diagnosis system of the fuel cell system according to claim 3, characterized in that: The failure detection unit (1002) comprises: a first resistor (R1), one end of the first resistor (R1) being connected to the ground node; An N+1th switch, one end of the N+1th switch is connected to the other end of the first resistor (R1), the other end of the N+1th switch is connected to one end of the first to Nth switches, and the control end of the N+1th switch is connected to the control component (200).

5. The insulation fault diagnosis system of the fuel cell system according to claim 4, characterized in that: The insulation detection unit (1003) comprises: a second resistor (R2), one end of the second resistor (R2) being connected to the ground node; An N+2th switch, one end of the N+2th switch is connected to the other end of the second resistor (R2), the other end of the N+2th switch is connected to one end of the first to Nth switches, and the control end of the N+2th switch is connected to the control component (200).

6. The insulation fault diagnosis system of the fuel cell system according to claim 5, characterized in that: The control component (200) comprises: The first to M+2th control units are respectively connected to one end of the first to N+2th switches in a one-to-one correspondence.

7. The insulation fault diagnosis system of the fuel cell system according to claim 5, characterized in that: The first to N+2 th switches are MOS tubes.

8. The insulation fault diagnosis system of the fuel cell system according to claim 1, characterized in that: Also includes: A display component (300), the display component (300) is connected to the control component (200) and is used to display components in the fuel cell system that are in an insulation failure state.

9. A fuel cell system, characterized in that: include: An insulation fault diagnosis system for a fuel cell system as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: include: The fuel cell system as claimed in claim 9.

Images