Fuel cell system and high voltage interlock detection method

Abstract

The invention discloses a fuel cell system and a high-voltage interlock detection method. The fuel cell system comprises a plurality of circuit structures, a plug connector and a controller. The at least two circuit structures are connected through a plug connector. A first test point position and a second test point position of the plug connector are connected in series, and two ends of the first switch are respectively connected with the first test point position and the second test point position to form a first test circuit; a third test point position and a fourth test point position of the plug connector are connected in series, and the two ends of the second switch are electrically connected with the third test point position and the fourth test point position respectively to form a second test circuit; and the controller is connected in series with the first test circuit and the second test circuit to form an interlocking signal loop for outputting a detection signal and receiving the detection signal returned by the interlocking signal. According to the embodiment of the invention, the fault detection efficiency of the plug connector can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of high-voltage interlock detection, and in particular, relates to a fuel cell system and a high-voltage interlock detection method. Background Art

[0002] Fuel cell systems usually use connectors to connect wiring harnesses and devices. During system operation, detecting whether the connectors are properly plugged in plays an important role in the safe and stable operation of the system.

[0003] In the related art, a multimeter, an oscilloscope and other devices are mainly used to assist in detecting whether the connector is properly plugged in. The operation process is cumbersome and the detection efficiency is poor. Summary of the invention

[0004] The embodiments of the present application provide a fuel cell system and a high-voltage interlock detection method, thereby improving the efficiency of connector plug-in fault detection at least to a certain extent.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0006] A first aspect of an embodiment of the present application provides a fuel cell system, comprising:

[0007] Multiple circuit configurations;

[0008] A plug connector, through which at least two of the circuit structures are connected, and the plug connector comprises:

[0009] A first plug-in structure and a second plug-in structure are arranged opposite to each other, wherein the first plug-in structure comprises a first test point, a second test point and a first switch, wherein the first test point and the second test point are connected in series, a first end of the first switch is electrically connected to the first test point, and a second end of the first switch is electrically connected to the second test point to form a first test circuit;

[0010] The second plug-in structure includes a third test point, a fourth test point and a second switch, the third test point and the fourth test point are connected in series, a first end of the second switch is electrically connected to the third test point, and a second end of the second switch is electrically connected to the fourth test point to form a second test circuit;

[0011] A controller is connected in series with the first test circuit and the second test circuit to form an interlock signal loop, and the controller is used to output a detection signal and receive the detection signal transmitted back through the interlock signal.

[0012] Optionally, the first test point includes a first contact and a second contact, the second test point includes a third contact and a fourth contact, and the second contact and the fourth contact are closer to one of the two circuit structures than the first contact and the third contact;

[0013] The first contact and the third contact are connected in series, a first end of the first switch is electrically connected to the second contact, and a second end of the first switch is electrically connected to the fourth contact.

[0014] Optionally, the third test point includes a fifth contact and a sixth contact, the fourth test point includes a seventh contact and an eighth contact, and the second contact and the fourth contact are closer to the other of the two circuit structures than the first contact and the third contact;

[0015] The fifth contact and the seventh contact are connected in series, the first end of the second switch is electrically connected to the sixth contact, and the second end of the first switch is electrically connected to the eighth contact.

[0016] Optionally, the circuit structure includes a battery stack, a DC / DC converter and high-voltage accessories;

[0017] The connector includes a first connector and a second connector. The battery stack and the DC / DC converter are electrically connected via the first connector, and the DC / DC converter and the high-voltage accessory are electrically connected via the second connector.

[0018] Optionally, the controller further includes:

[0019] A third switch, wherein a first end of the third switch is electrically connected to the output end of the controller, and a second end of the third switch is electrically connected to the input end of the controller.

[0020] A second aspect of an embodiment of the present application provides a high-voltage interlock detection method, which is applied to a fuel cell system as described in any one of the first aspects, and the method is executed in the controller of the fuel cell system, and the method includes:

[0021] When the first switch and the second switch are in an off state, outputting a first detection signal;

[0022] Determining whether there is a high-voltage interlock fault according to the transmission condition of the first detection signal in the interlock signal loop;

[0023] In the event of a high-voltage interlock fault, whether the connector has a plug-in fault is detected by switching the on / off state of the first switch and / or the second switch.

[0024] Optionally, the first detection signal has a first frequency and a first duty cycle when output, and determining whether there is a high-voltage interlock fault according to a transmission condition of the first detection signal in the interlock signal loop includes:

[0025] Acquire a second frequency and a second duty cycle of the first detection signal transmitted back through the interlock signal loop;

[0026] If the difference between the first frequency and the second frequency is greater than or equal to a first threshold, and / or the difference between the first duty cycle and the second duty cycle is greater than or equal to a second threshold, the high voltage interlock fault exists.

[0027] Optionally, the detecting whether the connector has a plugging fault by switching the on / off state of the first switch and / or the second switch includes:

[0028] When the first switch and the second switch are closed, outputting a second detection signal;

[0029] If the second detection signal transmitted back through the interlock signal loop is received, a third detection signal is outputted when the first switch or the second switch is disconnected;

[0030] If the third detection signal transmitted back by the interlock signal loop is not received, then there is a plug-in fault in the connector.

[0031] Optionally, after outputting the second detection signal, the method further includes:

[0032] If the second detection signal transmitted back through the interlock signal loop is not received, a line fault exists in the interlock signal loop.

[0033] Optionally, when the controller further includes a third switch, a first end of the third switch is electrically connected to the output end of the controller, and a second end of the third switch is electrically connected to the input end of the controller, before detecting whether the connector has a plug-in fault by switching the on / off state of the first switch and / or the second switch, the method further includes:

[0034] When the third switch is closed, outputting a fourth detection signal;

[0035] If the fourth detection signal is received, the step of detecting whether the connector has a plug-in fault by switching the on / off state of the first switch and / or the second switch is performed.

[0036] According to a third aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which at least one computer program instruction is stored. The at least one computer program instruction is loaded and executed by a processor to implement the operations performed by any method described in the first aspect.

[0037] According to a fourth aspect of an embodiment of the present application, an electronic device is provided, comprising one or more processors and one or more memories, wherein at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement the operations performed by any of the methods described in the first aspect.

[0038] One or more technical solutions provided by the embodiments of the present invention achieve at least the following technical effects or advantages:

[0039] The fuel cell system of the present application, based on the electrical connection relationship between the first switch and the first test point and the second test point, it can be known that the first switch can short-circuit the first test point and the second test point when closed; based on the electrical connection relationship between the second switch and the third test point and the fourth test point, it can be known that the second switch can short-circuit the third test point and the fourth test point when closed. Then, when the controller outputs a detection signal, if the first switch is disconnected, the detection signal will normally be transmitted from the first test point and the second test point and returned to the controller, otherwise there is a plug-in fault between the first test point and the second test point; if the first switch is closed, the detection signal will be returned from the first switch to the controller. Similarly, if the second switch is disconnected, the detection signal will normally be transmitted from the third test point and the fourth test point and returned to the controller, otherwise there is a plug-in fault between the third test point and the fourth test point; if the second switch is closed, the detection signal will be returned from the second switch to the controller. Therefore, by switching the on-off state of the first switch and the second switch, it is possible to detect whether the connector has a plug-in fault, without providing auxiliary detection equipment, thereby improving the plug-in fault detection efficiency of the connector.

[0040] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0042] Figure 1 A schematic structural diagram of a high voltage interlock detection device in an embodiment of the present application is shown;

[0043] Figure 2 A first structural schematic diagram of a plug connector according to an embodiment of the present application is shown;

[0044] Figure 3 A second structural schematic diagram of the connector according to an embodiment of the present application is shown;

[0045] Figure 4 A flow chart of a high voltage interlock detection method according to an embodiment of the present disclosure is shown;

[0046] Figure 5 A detailed schematic diagram of the high voltage interlock detection method according to an embodiment of the present application is shown;

[0047] Figure 6 A schematic diagram of the structure of a computer system suitable for implementing an electronic device of an embodiment of the present application is shown.

[0048] Among them, 1-battery stack; 2-controller; 21-third switch; 3-connector; 31-first plug structure; 32-second plug structure; 311-first test point; 312-second test point; 311A-first contact, 311B-second contact; 312A-third contact; 312B-fourth contact; 313-first switch; 321-third test point; 322-fourth test point; 323-second switch; 321A-fifth contact; 321B-sixth contact; 322A-seventh contact; 322B-eighth contact; 3A-first connector; 3B-second connector; 33-male plug; 34-first female plug; 35-second female plug; 36-high-voltage signal line contact; 4-DC / DC converter; 5-air compressor; 6-water pump; 7-hydrogen pump; 8-heater; 9-high-voltage fan. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0051] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0052] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may depend on the actual situation.

[0053] It should also be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those shown or described.

[0054] It should be noted that the fuel cell system includes a stack, a controller, a DC / DC (DC-DC converter) converter, and multiple high-voltage accessories. When the fuel cell system is working, the stack generates electricity to supply power to the outside, and high-voltage accessories such as air compressors also need to consume electricity to provide suitable air flow and pressure for the stack. In addition, the current and voltage output by the stack need to be converted into a constant voltage by a DC / DC converter to supply the air compressor and other internal power-consuming devices and external power-consuming devices of the system, and the transmission of electricity is achieved through high-voltage wiring harnesses. Usually, the connection between the wiring harness and the equipment is achieved through connectors, and during the operation of the fuel cell system, detecting whether the connector is plugged in place plays an important role in the safe and stable operation of the system.

[0055] In the related art, a multimeter, an oscilloscope and other devices are mainly used to assist in detecting whether the connector is properly plugged in. The operation process is cumbersome and the detection efficiency is poor.

[0056] In view of this, an embodiment of the present application provides a high-voltage interlock detection device, in order to improve the fault detection efficiency of the connector to a certain extent.

[0057] The high voltage interlock detection device in the embodiment of the present application will be described in detail below with reference to the specific drawings.

[0058] See also Figure 1 , showing a schematic diagram of the structure of the fuel cell system in the embodiment of the present application; see Figure 2 , shows a first structural schematic diagram of the connector of an embodiment of the present application; see Figure 3 , shows a second structural schematic diagram of the connector of an embodiment of the present application.

[0059] Combination Figures 1 to 3 A first aspect of an embodiment of the present application provides a fuel cell system, including: multiple circuit structures, a connector 3 and a controller 2.

[0060] At least two of the circuit structures are connected through the connector 3, and the connector 3 includes: a first plug-in structure 31 and a second plug-in structure 32 that are relatively arranged, the first plug-in structure 31 includes a first test point 311, a second test point 312 and a first switch 313, the first test point 311 and the second test point 312 are connected in series, the first end of the first switch 313 is electrically connected to the first test point 311, and the second end of the first switch 313 is electrically connected to the second test point 312 to form a first test circuit; the second plug-in structure 32 includes a third test point 321, a fourth test point 322 and a second switch 323, the third test point 321 and the fourth test point 322 are connected in series, the first end of the second switch 323 is electrically connected to the third test point 321, and the second end of the second switch 323 is electrically connected to the fourth test point 322 to form a second test circuit.

[0061] The controller 2 is connected in series with the first test circuit and the second test circuit to form an interlock signal loop. The controller 2 is used to output a detection signal and receive the detection signal transmitted back through the interlock signal.

[0062] Based on the electrical connection relationship between the first switch 313 and the first test point 311 and the second test point 312, it can be known that the first switch 313 can short-circuit the first test point 311 and the second test point 312 when closed; based on the electrical connection relationship between the second switch 323 and the third test point 321 and the fourth test point 322, it can be known that the second switch 323 can short-circuit the third test point 321 and the fourth test point 322 when closed. When the controller 2 outputs a detection signal, if the first switch 313 is disconnected, the detection signal will be transmitted from the first test point 311 and the second test point 312 and returned to the controller 2 under normal circumstances, otherwise there is a plug-in fault between the first test point 311 and the second test point 312; if the first switch 313 is closed, the detection signal will be returned from the first switch 313 to the controller 2. Similarly, if the second switch 323 is disconnected, the detection signal will normally be transmitted between the third test point 321 and the fourth test point 322 and transmitted back to the controller 2, otherwise there is a plug-in fault between the third test point 321 and the fourth test point 322; if the second switch 323 is closed, the detection signal will be transmitted back from the second switch 323 to the controller 2. Therefore, by switching the on and off states of the first switch 313 and the second switch 323, it is possible to detect whether there is a plug-in fault in the plug connector 3 without setting up auxiliary detection equipment, thereby improving the plug-in fault detection efficiency of the plug connector 3.

[0063] Exemplarily, the first switch 313 and the second switch 323 may be manual switches or electric switches. When the first switch 313 and the second switch 323 are electric switches, the opening and closing of the electric switches may be controlled by an electrical signal output by the controller 2, which is not limited here.

[0064] Continue to see Figure 3 For example, the first connector 3A and the second connector 3B may be connectors 3 with low voltage interlocking signal lines added on the basis of the traditional high voltage connector 3. Figure 2 As shown, the connector 3 includes a male plug 33, a first female plug 34 and a second female plug 35. The first female plug 34 can be set on one of the circuit structures, and the second female plug 35 can be set on the other circuit structure. A high-voltage signal line and a high-voltage signal line contact 36 are set in the male plug 33, and a high-voltage signal line and a high-voltage signal line contact 36 are also set in the first female plug 34 and the second female plug 35. Therefore, when the first end of the male plug 33 is plugged into the first female plug 34, and when the second end of the male plug 33 is plugged into the second female plug 35, if the plugs are in place, the various high-voltage signal line contacts 36 can contact each other, thereby realizing the electrical connection of the two circuit structures. Therefore, the high-voltage signal line contact 36 is located at the effective plugging position of the connector 3.

[0065] Continue to see Figure 3 In some embodiments, the first test point 311 includes a first contact 311A ​​and a second contact 311B, the second test point 312 includes a third contact 312A and a fourth contact 312B, the second contact 311B and the fourth contact 312B are closer to one of the two circuit structures than the first contact 311A ​​and the third contact 312A; the first contact 311A ​​and the third contact 312A are connected in series, the first end of the first switch 313 is electrically connected to the second contact 311B, and the second end of the first switch 313 is electrically connected to the fourth contact 312B.

[0066] It can be understood that when the first end of the male plug 33 is plugged into the first female plug 34, and when the second end of the male plug 33 is plugged into the second female plug 35, if the plugging is in place, the first contact 311A ​​and the second contact 311B can contact each other, and the third contact 312A and the fourth contact 312B can effectively contact each other. When the first switch 313 is disconnected, the detection signal output by the controller 2 can be transmitted from the first contact 311A ​​(the second contact 311B) and the third contact 312A. (fourth) contacts pass normally; if the connection is not in place, the first contact 311A ​​and the second contact 311B may have poor contact or no contact, and the third contact 312A and the fourth contact 312B may have poor contact or no contact, then when the first switch 313 is disconnected, the detection signal output by the controller 2 may not pass normally between the first contact 311A ​​(second contact 311B) and the third contact 312A (fourth contact 312B), for example, there is a deviation in the signal, or the signal cannot be transmitted. Therefore, by closing the second switch 323 and disconnecting the first switch 313, it can be detected whether there is a connection fault between the first test point 311 and the second test point 312, that is, whether the connector 3 is plugged into one of the two circuit structures.

[0067] Continue to see Figure 3 In some embodiments, the third test point 321 includes a fifth contact 321A and a sixth contact 321B, the fourth test point 322 includes a seventh contact 322A and an eighth contact 322B, the second contact 311B and the fourth contact 312B are closer to the other of the two circuit structures than the first contact 311A ​​and the third contact 312A; the fifth contact 321A and the seventh contact 322A are connected in series, the first end of the second switch 323 is electrically connected to the sixth contact 321B, and the second end of the first switch 313 is electrically connected to the eighth contact 322B.

[0068] It can be understood that when the first end of the male plug 33 is plugged into the first female plug 34, and when the second end of the male plug 33 is plugged into the second female plug 35, if the plugging is in place, the fifth contact 321A and the sixth contact 321B can contact each other, and the seventh contact 322A and the eighth contact 322B can effectively contact each other. When the second switch 323 is disconnected, the detection signal output by the controller 2 can be transmitted from the fifth contact 321A (sixth contact 321B) and the seventh contact 322A (the eighth contact 322B). If the plug-in is not in place, the fifth contact 321A and the sixth contact 321B may have poor contact or no contact, and the seventh contact 322A and the eighth contact 322B may have poor contact or no contact. Then, when the second switch 323 is disconnected, the detection signal output by the controller 2 may not be able to pass normally between the fifth contact 321A (sixth contact 321B) and the seventh contact 322A (eighth contact 322B), for example, there is a deviation in the signal, or the signal cannot be transmitted. Therefore, by closing the first switch 313 and disconnecting the second switch 323, it is possible to detect whether there is a plug-in fault between the third test point 321 and the fourth test point 322, that is, whether the plug-in connector 3 is plugged into the other circuit structure of the two circuit structures.

[0069] In some embodiments, the circuit structure includes a battery stack 1, a DC / DC converter 4 and a high-voltage accessory;

[0070] The connector 3 includes a first connector 3A and a second connector 3B. The battery stack 1 and the DC / DC converter 4 are electrically connected via the first connector 3A, and the DC / DC converter 4 and the high-voltage accessory are electrically connected via the second connector 3B.

[0071] It is understandable that there may be multiple high-voltage accessories, including but not limited to: air compressor 5, water pump 6, hydrogen pump 7, heater 8 and high-voltage cooling fan, etc. There may also be multiple corresponding second connectors 3B, and the DC / DC converter 4 and one of the high-voltage accessories may be electrically connected through one second connector 3B.

[0072] Continue to see Figure 1 In the first connector 3A and the second connector 3B, each connector 3 includes a first test circuit and a second test circuit. The first test circuit and the second test circuit are connected in series to form a test circuit of the connector 3. Then, the test circuits are connected in series with the controller 2 to form a complete interlocking signal loop.

[0073] It can be understood that when multiple connectors 3 are provided, multiple first switches 313 and second switches 323 are also provided accordingly, for example: the first switch 313 of the first connector 3A is located on the side of the first connector 3A close to the battery stack 1, and the second switch 323 is located on the side of the first connector 3A close to the DC / DC converter 4; the first switch 313 of the second connector 3B is located on the side of the second connector 3B close to the DC / DC converter 4, and the second switch 323 is located on the side of the second connector 3B close to the high-voltage accessories. Thus, by switching the on-off state of the first switch 313 and the second switch 323, the plug-in validity of the first connector 3A with the battery stack 1 and the plug-in validity with the DC / DC converter 4 can be detected, and the plug-in validity of the second connector 3B with the DC / DC converter 4 and the plug-in validity with the high-voltage accessories can be detected.

[0074] Continue to see Figure 1 In some embodiments, the controller 2 further includes:

[0075] A third switch 21 , wherein a first end of the third switch 21 is electrically connected to an output end of the controller 2 , and a second end of the third switch 21 is electrically connected to an input end of the controller 2 .

[0076] It should be noted that the first end of the third switch 21 is electrically connected to the output end of the controller 2, and the second end of the third switch 21 is electrically connected to the input end of the controller 2, which essentially means that the third switch 21 partially short-circuits the controller 2. When the third switch 21 is closed, the controller 2 is short-circuited, and the detection signal sent by the controller 2 will be received by itself, so that it can be determined whether the controller 2 itself has a fault based on the signal reception situation, thereby eliminating the interference of the controller 2 fault on the connector 3 fault detection.

[0077] See also Figure 4 , shows a flow chart of a high voltage interlock detection method according to an embodiment of the present disclosure.

[0078] like Figure 4 As shown, the second aspect of the embodiment of the present application provides a high-voltage interlock detection method, which is applied to the fuel cell system as described in any one of the first aspects, and the method is executed in the controller of the fuel cell system, and the method includes but is not limited to:

[0079] Step S100. When the first switch and the second switch are in an off state, output a first detection signal;

[0080] Exemplarily, the first detection signal may be a pulse signal, and the pulse signal may be output at a first frequency and a second duty cycle.

[0081] Step S200. Determine whether there is a high-voltage interlock fault according to the transmission of the first detection signal in the interlock signal loop;

[0082] It can be understood that when the first switch and the second switch of the controller are in the disconnected state, after the controller outputs the first detection signal, if the connector is plugged into the circuit structure, the first contact and the second contact can contact each other, the third contact and the fourth contact can effectively contact each other, the fifth contact and the sixth contact can contact each other, and the seventh contact and the eighth contact can effectively contact each other. Then the first detection signal will be transmitted back to the controller input terminal through the first test point, the second test point, the third test point and the fourth test point in sequence. If the connector and the circuit structure are not plugged into place, for example, the contact is poor or not released, the first detection signal will deviate greatly from the output after being transmitted back, and the controller may even be unable to receive the first detection signal, thereby determining that there is a high-voltage interlock fault.

[0083] In some embodiments, the first detection signal has a first frequency and a first duty cycle when output, and determining whether there is a high-voltage interlock fault according to the transmission condition of the first detection signal in the interlock signal loop includes:

[0084] Step S201. Acquire a second frequency and a second duty cycle of the first detection signal transmitted back through the interlock signal loop;

[0085] Step S202: If the difference between the first frequency and the second frequency is greater than or equal to a first threshold, and / or the difference between the first duty cycle and the second duty cycle is greater than or equal to a second threshold, the high voltage interlock fault exists.

[0086] It is understandable that the first threshold and the second threshold can be obtained by calibration, and the first threshold and the second threshold can be the maximum difference between the first detection signal transmitted back and the first detection signal output due to the influence of the interference signal when the first detection signal is transmitted in the interlocking signal loop. Then, when the difference between the first frequency and the second frequency is greater than or equal to the first threshold, it means that the difference is not only caused by the interference signal, and it is likely that a high-voltage interlock fault has occurred; similarly, when the difference between the first duty cycle and the second duty cycle is greater than or equal to the second threshold, it means that the difference is not only caused by the interference signal, and it is likely that a high-voltage interlock fault has occurred.

[0087] It should be noted that after determining that the interlock signal circuit has a high-voltage interlock fault, the fuel cell system can be controlled to lower the high voltage, maintain the low voltage, and keep the controller powered on.

[0088] Step S300: In the event of a high-voltage interlock fault, whether the connector has a plug-in fault is detected by switching the on / off state of the first switch and / or the second switch.

[0089] In some embodiments, when the controller further includes a third switch, a first end of the third switch is electrically connected to an output end of the controller, and a second end of the third switch is electrically connected to an input end of the controller, before detecting whether the connector has a plug-in fault by switching the on / off state of the first switch and / or the second switch, the method further includes:

[0090] When the third switch is closed, outputting a fourth detection signal;

[0091] If the fourth detection signal is received, the step of detecting whether the connector has a plug-in fault by switching the on / off state of the first switch and / or the second switch is performed.

[0092] It should be noted that the first end of the third switch is electrically connected to the output end of the controller, and the second end of the third switch is electrically connected to the input end of the controller, which essentially means that the third switch partially short-circuits the controller. When the third switch is closed, the controller is short-circuited, and the detection signal sent by the controller will be received by itself, so that it can be determined whether the controller itself has a fault based on the signal reception situation, thereby eliminating the interference of the controller fault on the connector fault detection.

[0093] In some embodiments, the detecting whether the connector has a plug-in fault by switching the on / off state of the first switch and / or the second switch includes:

[0094] Step S301. When the first switch and the second switch are closed, output a second detection signal;

[0095] In some embodiments, after outputting the second detection signal, the method further includes:

[0096] If the second detection signal transmitted back through the interlock signal loop is not received, a line fault exists in the interlock signal loop.

[0097] It can be understood that when the first switch and the second switch are in a closed state, the first test point and the second test point are short-circuited, and the third test point and the fourth test point are short-circuited, then the output second detection signal is transmitted back to the input end of the controller through the first switch and the second switch connected in series. Therefore, if the second signal is not received, it means that there is a fault in the interlock signal circuit itself.

[0098] Therefore, before performing plug-in fault detection on the plug-in connector, it is possible to first detect whether there is a fault in the interlock signal line, so as to eliminate the interference of the signal line fault on the plug-in fault detection of the plug-in connector.

[0099] Step S302. If the second detection signal transmitted back through the interlock signal loop is received, a third detection signal is output when the first switch or the second switch is disconnected;

[0100] Step S303: If the third detection signal transmitted back by the interlock signal loop is not received, then there is a plug-in fault in the connector.

[0101] It can be understood that, when the first switch is disconnected and the second switch is closed, the third detection signal will be transmitted back to the controller through the first test point, the second test point and the second switch. If the third detection signal is not transmitted back to the controller, it means that the first test point and the second test point have poor contact, and there is a plug-in fault on one side of the connector. Similarly, when the first switch is closed and the second switch is disconnected, the third detection signal will be transmitted back to the controller after passing through the first switch, the fourth test point and the third test point. If the third detection signal is not transmitted back to the controller, it means that the third test point and the fourth test point have poor contact, and there is a plug-in fault on the other side of the connector. In this way, it is possible to locate which side of the connector has a plug-in fault, thereby improving the detection accuracy.

[0102] On the basis of the above, if there are multiple connectors, multiple first switches, and multiple second switches, and each switch is sequentially connected in series in the interlock signal loop, then by disconnecting one of the switches each time and keeping the other switches in a closed state, it is possible to locate whether the connector corresponding to the disconnected switch has a plug-in fault, so that when the fuel cell system has multiple connectors, it is also possible to locate one or more faulty connectors, thereby improving the positioning accuracy.

[0103] In order to fully understand the process of the high-voltage interlock detection method of the embodiment of the present application, the following is an exemplary description of the work flow in combination with the accompanying drawings and specific embodiments.

[0104] See also Figure 5 , shows a detailed flow chart of the high voltage interlock detection method of an embodiment of the present application.

[0105] To simplify the explanation, Figure 5 In the embodiment, the third switch is defined as KO, and a plurality of first switches and a plurality of second switches connected in series from the output end of the controller are defined as K1-K12 in sequence. The detailed process of the method is described below.

[0106] S1: fuel cell system starts working;

[0107] S2: The controller (e.g. FCCU, Fuel Cell Control Unit, fuel cell system controller) sends a PWM (Pulse-Width Modulation) wave signal with a frequency of f and a duty cycle of λ;

[0108] S3: The PWM wave signal is transmitted back to the controller via the interlock signal line, and the received signal frequency is recorded as f' and the duty cycle is λ';

[0109] S4: Calculate the frequency difference f-f' and the duty cycle difference λ-λ' between the signal frequency and duty cycle sent by the controller and the signal frequency and duty cycle received;

[0110] S5: If the frequency difference is greater than the first threshold value Δf, and the duty cycle difference is also greater than the first threshold value Δλ, a high voltage interlock fault occurs;

[0111] S6: When a high-voltage interlock fault occurs, the fuel cell system reduces the high voltage, maintains the low voltage, and keeps the controller powered on;

[0112] S7: Close the second switch K0 to check for problems with the controller itself;

[0113] S8: After closing the second switch K0, determine whether the high-voltage interlock fault alarmed by the controller is eliminated;

[0114] S9: If the fault is eliminated, it proves that the controller itself has a signal receiving and sending problem;

[0115] S10: After S8, if the fault is still not eliminated, the second switch K0 is opened and the first switches K1-K12 are closed;

[0116] S11: Determine whether the high voltage interlock fault is eliminated;

[0117] S12: If the fault is still not eliminated after S11, it proves that there is a circuit break in the line or abnormal connection of the non-connector;

[0118] S13: If the fault is eliminated after S11, it proves that there are one or more abnormal connections in the high-voltage connectors. Then, disconnect one switch at a time and determine whether the high-voltage interlock fault occurs again. If so, the corresponding connectors are abnormally connected.

[0119] According to a third aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which at least one computer program instruction is stored. The at least one computer program instruction is loaded and executed by a processor to implement the operations performed by any method described in the first aspect.

[0120] The computer readable storage medium may be a portable compact disk read-only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the computer readable storage medium of the present application is not limited thereto, and in the present application, the readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, apparatus, or device.

[0121] The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection with one or more conductors, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0122] Program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0123] See also Figure 6 , which is a schematic diagram of the structure of a computer system suitable for implementing an electronic device of an embodiment of the present application.

[0124] According to the fourth aspect of an embodiment of the present application, an electronic device is provided, comprising one or more processors and one or more memories, wherein at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors to implement operations performed by any method of the first aspect.

[0125] like Figure 6 As shown, the electronic device 400 is in the form of a general computing device. The components of the electronic device 400 may include but are not limited to: at least one processing unit 410, at least one storage unit 420, and a bus 430 connecting different system components (including the storage unit 420 and the processing unit 410).

[0126] The storage unit stores program codes, which can be executed by the processing unit 410, so that the processing unit 410 executes the steps described in the above “Embodiment Method” section of this specification according to various exemplary implementations of the present application.

[0127] The storage unit 420 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 421 and / or a cache 422 , and may further include a read-only memory unit (ROM) 423 .

[0128] The storage unit 420 may also include a program / utility 424 having a set (at least one) of program modules 425, such program modules 425 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0129] Bus 430 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0130] The electronic device 400 may also communicate with one or more external devices 500 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 400, and / or communicate with any device that enables the electronic device 400 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed through an I / O (input / output) interface 450, wherein the I / O interface 450 may also be connected to a display unit 440 to display the communication content through the display unit 440. In addition, the electronic device 400 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter 460. As shown in the figure, the network adapter 460 communicates with other modules of the electronic device 400 through the bus 430. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 400, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0131] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0132] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0133] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0134] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-On l yMemory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc., various media that can store program codes.

[0135] The above description is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A fuel cell system, characterized in that: include: Multiple circuit configurations; A plug connector, through which at least two of the circuit structures are connected, and the plug connector comprises: A first plug-in structure and a second plug-in structure are arranged opposite to each other, wherein the first plug-in structure comprises a first test point, a second test point and a first switch, wherein the first test point and the second test point are connected in series, a first end of the first switch is electrically connected to the first test point, and a second end of the first switch is electrically connected to the second test point to form a first test circuit; The second plug-in structure includes a third test point, a fourth test point and a second switch, the third test point and the fourth test point are connected in series, a first end of the second switch is electrically connected to the third test point, and a second end of the second switch is electrically connected to the fourth test point to form a second test circuit; A controller is connected in series with the first test circuit and the second test circuit to form an interlock signal loop, and the controller is used to output a detection signal and receive the detection signal transmitted back through the interlock signal.

2. The system according to claim 1, characterized in that The first test point includes a first contact and a second contact, the second test point includes a third contact and a fourth contact, and the second contact and the fourth contact are closer to one of the two circuit structures than the first contact and the third contact; The first contact and the third contact are connected in series, a first end of the first switch is electrically connected to the second contact, and a second end of the first switch is electrically connected to the fourth contact.

3. The system according to claim 1, characterized in that The third test point includes a fifth contact and a sixth contact, the fourth test point includes a seventh contact and an eighth contact, and the second contact and the fourth contact are closer to the other circuit structure of the two circuit structures than the first contact and the third contact; The fifth contact and the seventh contact are connected in series, the first end of the second switch is electrically connected to the sixth contact, and the second end of the first switch is electrically connected to the eighth contact.

4. The system according to claim 1, characterized in that The circuit structure includes a battery stack, a DC / DC converter and high-voltage accessories; The connector includes a first connector and a second connector. The battery stack and the DC / DC converter are electrically connected via the first connector, and the DC / DC converter and the high-voltage accessory are electrically connected via the second connector.

5. The system according to any one of claims 1 to 4, characterized in that: The controller further comprises: A third switch, wherein a first end of the third switch is electrically connected to the output end of the controller, and a second end of the third switch is electrically connected to the input end of the controller.

6. A high voltage interlock detection method, characterized in that: Applied to the fuel cell system according to any one of claims 1 to 5, the method is executed in the controller of the fuel cell system, and the method comprises: When the first switch and the second switch are in an off state, outputting a first detection signal; Determining whether there is a high-voltage interlock fault according to the transmission condition of the first detection signal in the interlock signal loop; In the event of a high-voltage interlock fault, whether the connector has a plug-in fault is detected by switching the on / off state of the first switch and / or the second switch.

7. The method according to claim 6, characterized in that The first detection signal has a first frequency and a first duty cycle when output, and determining whether there is a high-voltage interlock fault according to the transmission condition of the first detection signal in the interlock signal loop includes: Acquire a second frequency and a second duty cycle of the first detection signal transmitted back through the interlock signal loop; If the difference between the first frequency and the second frequency is greater than or equal to a first threshold, and / or the difference between the first duty cycle and the second duty cycle is greater than or equal to a second threshold, the high voltage interlock fault exists.

8. The method according to claim 6, characterized in that The detecting whether the connector has a plugging fault by switching the on / off state of the first switch and / or the second switch includes: When the first switch and the second switch are closed, outputting a second detection signal; If the second detection signal transmitted back through the interlock signal loop is received, a third detection signal is outputted when the first switch or the second switch is disconnected; If the third detection signal transmitted back by the interlock signal loop is not received, then there is a plug-in fault in the connector.

9. The method according to claim 8, characterized in that After outputting the second detection signal, the method further includes: If the second detection signal transmitted back through the interlock signal loop is not received, a line fault exists in the interlock signal loop.

10. The method according to claim 7, characterized in that When the controller further includes a third switch, a first end of the third switch is electrically connected to the output end of the controller, and a second end of the third switch is electrically connected to the input end of the controller, before detecting whether the connector has a plug-in fault by switching the on / off state of the first switch and / or the second switch, the method further includes: When the third switch is closed, outputting a fourth detection signal; If the fourth detection signal is received, the step of detecting whether the connector has a plug-in fault by switching the on / off state of the first switch and / or the second switch is performed.

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