Automobile charging and discharging circuit fault diagnosis system and method

Abstract

The invention relates to the technical field of automobile charging and discharging, in particular to an automobile charging and discharging circuit fault diagnosis system and method, and the system comprises a power distribution unit, a power interface, a relay switch, a drive circuit, a sampling module and a controller. The power interface is electrically connected with the input / output end of the power distribution unit; the relay switch is arranged between the power distribution unit and the power interface so as to control the on-off state of the charging and discharging circuit; the driving circuit is used for driving the relay switch to act; the sampling module is used for collecting circuit information of the charging and discharging circuit; the controller is used for controlling the working state of the driving circuit, obtaining fault information and circuit information of the driving circuit and judging the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information. The automobile charging and discharging circuit fault diagnosis system provided by the invention can carry out accurate and comprehensive diagnosis on the automobile charging and discharging circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile charging and discharging, and in particular to a system and method for diagnosing automobile charging and discharging circuit faults. Background Art

[0002] With the increasing popularity of cars as another living space concept, the functions of cars are no longer limited to means of transportation. In addition to the necessary charging function, plug-in hybrid vehicles / pure electric vehicles also have more and more external discharge usage scenarios. At present, the external output interface and charging interface of the car are often reused, and more complex models also support in-car discharge. For these charging and discharging circuits, relays (switching devices used to control larger currents through smaller currents) are needed to control the on and off of the charging and discharging circuits to ensure the normal operation of the charging and discharging functions and ensure the safety of electricity use.

[0003] However, in the prior art, the vehicle control system only performs drive-level diagnosis on the relay drive circuit (such as ground short circuit, power short circuit), and is unable to perform fault diagnosis (sticking, open circuit, etc.) on the relay secondary circuit; therefore, the current vehicle control system still has limitations such as low diagnostic accuracy and relatively one-sided diagnostic results when performing relay fault diagnosis. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a system and method for diagnosing automobile charging and discharging circuit faults with more accurate and comprehensive diagnostic results.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a vehicle charging and discharging circuit fault diagnosis system, comprising:

[0006] Power distribution unit;

[0007] A power interface, electrically connected to an input / output terminal of the power distribution unit;

[0008] A relay switch is provided between the power distribution unit and the power interface to control the on / off state of the charge and discharge circuit;

[0009] A driving circuit, used for driving the relay switch action;

[0010] A sampling module, used for collecting circuit information of the charging and discharging circuit;

[0011] A controller, used to control the working state of the driving circuit, obtain the fault information of the driving circuit and the circuit information, and determine the fault type of the vehicle charging and discharging circuit according to the fault information and the circuit information;

[0012] Wherein, the fault type of the automobile charging and discharging circuit at least includes relay switch failure and / or charging and discharging circuit open circuit and / or drive circuit short circuit and / or drive circuit open circuit.

[0013] In an optional embodiment of the present invention, the power interface includes an external charging and discharging interface and / or an internal discharging interface.

[0014] In an optional embodiment of the present invention, the relay switch includes a first relay switch arranged between the external charging and discharging interface and the power distribution unit, and / or a second relay switch arranged between the internal discharging interface and the power distribution unit.

[0015] In an optional embodiment of the present invention, the sampling module includes at least a first sampling unit for collecting circuit information between the relay switch and the power interface, and a second sampling unit for collecting circuit information between the power distribution unit and the relay switch.

[0016] In an optional embodiment of the present invention, the charging and discharging circuit includes:

[0017] A bus, electrically connected to the power distribution unit;

[0018] Branch lines, including a first branch line electrically connecting the bus and the off-vehicle charging and discharging interface, and a second branch line electrically connecting the bus and the on-vehicle discharging interface;

[0019] The first relay switch is arranged on the first branch line, and the second relay switch is arranged on the second branch line;

[0020] The first sampling unit includes a first sub-sampling unit and a second sub-sampling unit, the first sub-sampling unit is arranged between the first relay switch of the first branch line and the off-vehicle charging and discharging interface, and the second sub-sampling unit is arranged between the second relay switch of the second branch line and the on-vehicle discharging interface;

[0021] The second sampling unit is disposed at an electrical connection junction of the bus, the first branch line and the second branch line.

[0022] In an optional embodiment of the present invention, the sampling module further includes a third sampling unit for collecting circuit information at the input / output end of the power distribution unit.

[0023] To achieve the above-mentioned purpose and other related purposes, the present invention provides a method for diagnosing faults in an automobile charging and discharging circuit, which is applied to a controller of the automobile charging and discharging circuit fault diagnosis system, the system comprising a power distribution unit, a power interface, a relay switch, a drive circuit, a sampling module and a controller; the power interface is electrically connected to the input / output end of the power distribution unit; the relay switch is arranged between the power distribution unit and the power interface to control the on-off state of the charging and discharging circuit; the drive circuit is used to drive the relay switch to operate; the sampling module is used to collect circuit information of the charging and discharging circuit, and the sampling module at least includes a first sampling unit for collecting circuit information between the relay switch and the power interface, and a second sampling unit for collecting circuit information between the power distribution unit and the relay switch, and / or a third sampling unit for collecting circuit information at the input / output end of the power distribution unit; the controller is used to control the working state of the drive circuit; the method comprises the following steps:

[0024] Acquiring fault information of the driving circuit and circuit information collected by the sampling module;

[0025] Determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information;

[0026] Wherein, the fault type of the automobile charging and discharging circuit at least includes relay switch failure and / or charging and discharging circuit open circuit and / or drive circuit short circuit and / or drive circuit open circuit.

[0027] In an optional embodiment of the present invention, the step of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information includes:

[0028] When the circuit information collected by the first sampling unit and the second sampling unit both indicate that voltage exists, and the driving circuit is not driven and no other faults are reported, it is determined that the fault type of the automobile charging and discharging circuit is a relay switch fault;

[0029] In an optional embodiment of the present invention, the step of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes:

[0030] When one of the circuit information collected by the first sampling unit and the second sampling unit indicates that there is no voltage and the other indicates that there is voltage, and the driving circuit is driven normally and no other faults are reported, it is determined that the fault type of the automobile charging and discharging circuit is that the charging and discharging circuit between the power distribution unit and the power interface is open;

[0031] In an optional embodiment of the present invention, when one of the circuit information collected by the first sampling unit and the second sampling unit indicates that there is no voltage and the other indicates that there is voltage, and the drive circuit is driven normally and no other faults are reported, the step of determining that the fault type of the automobile charging and discharging circuit is that the charging and discharging circuit between the voltage distribution unit and the power interface is open also includes:

[0032] When the circuit information collected by the first sampling unit indicates that there is no voltage, and the circuit information collected by the second sampling unit indicates that there is voltage, and the driving circuit is driven normally and no other faults are reported, it is determined that the fault type of the automobile charging and discharging circuit is that the charging and discharging circuit between the relay switch and the power interface is open;

[0033] When the circuit information collected by the first sampling unit shows that voltage exists, and the circuit information collected by the second sampling unit shows that no voltage exists, and the driving circuit is driven normally and no other faults are reported, it is determined that the fault type of the automobile charging and discharging circuit is that the charging and discharging circuit between the relay switch and the power distribution unit is open.

[0034] In an optional embodiment of the present invention, the step of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes:

[0035] When the circuit information collected by the first sampling unit and the second sampling unit indicates that voltage exists, and the fault information of the driving circuit is a circuit short circuit, it is determined that the fault type of the automobile charging and discharging circuit is a driving circuit short circuit;

[0036] In an optional embodiment of the present invention, the step of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes:

[0037] When one of the circuit information collected by the first sampling unit and the second sampling unit indicates that there is no voltage and the other indicates that there is voltage, and the fault information of the drive circuit is open circuit, it is determined that the fault type of the vehicle charging and discharging circuit is open circuit of the drive circuit.

[0038] In an optional embodiment of the present invention, the step of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes:

[0039] When the controller detects that the power distribution unit is in a discharging state and the circuit information collected by the third sampling unit indicates that there is no voltage, it is determined that the fault type of the automobile charging and discharging circuit is a power distribution unit output failure.

[0040] In an optional embodiment of the present invention, the step of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes:

[0041] When the controller detects that the power distribution unit is in a charging state, the circuit information collected by the second sampling unit shows that voltage exists, and the circuit information collected by the third sampling unit shows that no voltage exists, it is determined that the fault type of the vehicle charging and discharging circuit is that the charging and discharging circuit between the second sampling unit and the third sampling unit is open.

[0042] To achieve the above-mentioned object and other related objects, the present invention provides a vehicle, including the above-mentioned automobile charging and discharging circuit fault diagnosis system.

[0043] The technical effect of the present invention is that the driving circuit is controlled by the controller, the relay switch is controlled by the driving circuit, and the on-off state of the charging and discharging circuit is controlled by the relay switch, so as to ensure the normal operation of the charging and discharging function and guarantee the safety of electricity use; the circuit information of the charging and discharging circuit is collected by the sampling module, the controller is electrically connected with the driving circuit and the sampling module, and the working state of the driving circuit is controlled by the controller, and the fault information of the driving circuit and the circuit information collected by the sampling module are obtained, and the fault type of the automobile charging and discharging circuit is judged according to the fault information and the circuit information; thereby, the automobile charging and discharging circuit fault diagnosis system of this case can not only perform drive-level diagnosis on the driving circuit of the relay switch, but also perform fault (such as adhesion, open circuit) diagnosis on the secondary circuit of the relay switch and the relay switch itself, so as to achieve more comprehensive and accurate fault diagnosis of the automobile charging and discharging circuit, and guarantee the safety of electricity use of the automobile charging and discharging circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of a vehicle charging and discharging circuit fault diagnosis system in one embodiment of the present invention;

[0045] Figure 2 is a schematic structural diagram of a vehicle charging and discharging circuit fault diagnosis system in another embodiment of the present invention;

[0046] Figure 3 is a structural relationship diagram between a sampling module and a controller in one embodiment of the present invention;

[0047] Figure 4 is a method flow chart of a method for diagnosing faults in a charging and discharging circuit of an automobile in one embodiment of the present invention;

[0048] Figure 5 is a method flow chart of a method for diagnosing faults in an automobile charging and discharging circuit in another embodiment of the present invention;

[0049] Reference numerals:

[0050] Power distribution unit 1, power interface 2, external charging and discharging interface 21, internal discharging interface 22, relay switch 3, first relay switch 31, second relay switch 32, drive circuit 4, first drive circuit 41, second drive circuit 42, sampling module 5, first sampling unit 51, first sub-sampling unit 511, second sub-sampling unit 512, second sampling unit 52, third sampling unit 53, controller 6, charging and discharging circuit 7, bus 71, branch line 72, first branch line 721, second branch line 722, sampling board 8. DETAILED DESCRIPTION

[0051] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0052] It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention in a schematic manner, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0053] like Figure 1 As shown, the present invention provides a vehicle charging and discharging circuit fault diagnosis system, comprising a power distribution unit 1, a power interface 2, a relay switch 3, a drive circuit 4, a sampling module 5 and a controller 6; the power interface 2 is electrically connected to the input / output end of the power distribution unit 1; the relay switch 3 is arranged between the power distribution unit 1 and the power interface 2 to control the on-off state of the charging and discharging circuit 7; the drive circuit 4 is electrically connected to the relay switch 3 to drive the relay switch 3 to operate; the sampling module 5 is used to collect circuit information corresponding to the charging and discharging circuit 7; the controller 6 is electrically connected to the drive circuit 4 and the sampling module 5, and is used to control the working state of the drive circuit 4, and to obtain the fault information of the drive circuit 4 and the circuit information collected by the sampling module 5, and to judge the fault type of the vehicle charging and discharging circuit according to the fault information and the circuit information, wherein the fault type of the vehicle charging and discharging circuit at least includes relay switch 3 fault and / or charging and discharging circuit 7 open circuit and / or drive circuit 4 short circuit and / or drive circuit 4 open circuit.

[0054] It should be noted that the core function of the power distribution unit 1 is to manage and distribute the electric energy in the voltage system to ensure the safety and efficiency of the whole vehicle during the charging and discharging process; in addition, the power distribution unit 1 can also have a series of protection and monitoring functions, for example, the power distribution unit 1 includes controlling the power on of the voltage components, preventing circuit overload and short circuit, realizing high voltage sampling and low voltage control, etc. These functions work together to protect and monitor the operating status of the high voltage system to maintain the electrical safety and system stability of the vehicle. The power distribution unit 1 can also integrate multiple key functions such as the battery management system main control, charging module, DC conversion module and positive temperature coefficient heating control module; the battery management system main control is responsible for monitoring and managing the battery pack to ensure that it works in the best state; the charging module handles the conversion of electric energy to ensure efficient and safe charging of the battery; the DC conversion module converts high voltage DC into low voltage DC to provide stable power for the low voltage equipment inside the vehicle; and the positive temperature coefficient heating control module focuses on regulating the temperature inside the vehicle and ensuring that key components work normally at low temperatures. The power distribution unit 1 is generally connected to a battery pack and an on-board charger, and the battery pack is used to store or release electric energy; the bidirectional charging and discharging device can convert the direct current of the battery pack into alternating current for use by external devices, and can also convert alternating current into direct current to charge the battery pack. The power interface 2 is electrically connected to the input / output end of the power distribution unit 1 through the automobile charging and discharging circuit. The wires of the automobile charging and discharging circuit generally include a live wire, a neutral wire and a ground wire. The relay switch 3 in this case can be a switch on the live wire to control the on and off of the live wire, or a switch on the neutral wire to control the on and off of the neutral wire. The relay switch 3 in this case is generally a normally open relay. The sampling module 7 in this case is mainly used to collect voltage information of the live wire. It should be understood that the circuit information can include current information, voltage information, resistance information, circuit on and off information, short circuit information, etc. of the circuit; the input end of the power distribution unit 1 is mainly used for charging the automobile battery, and the output end is mainly used for discharging the automobile battery; the power interface 2 mainly refers to an interface for connecting charging and discharging equipment, such as an AC charging and discharging interface, to meet different charging needs. In some charging and discharging circuits, it is necessary to control the on and off of the charging and discharging circuits through relays to ensure the normal operation of the charging and discharging functions and to ensure the safety of electricity use. The relay switch 3 is a switching device used to control a larger current through a smaller current; the driving circuit 4 of the relay switch 3 usually includes basic electronic components such as transistors, resistors and diodes, and mainly drives the relay coil to be energized and de-energized by controlling the conduction and cutoff of the transistor, so that its contacts are attracted or released. For example, the TD62003AP chip is a chip that integrates multiple driving transistors and is specifically used to drive relays.The sampling module 5 is used to collect the on / off state of the charge-discharge circuit 7 to ensure the safety and stable operation of the circuit. For example, the voltage information of the charge-discharge circuit 7 can be determined by collecting the voltage of the charge-discharge circuit 7. The sampling module 5 can be implemented in a variety of ways, such as a resistor voltage divider circuit, an integrated chip solution (using an analog-to-digital converter on the voltage side to complete voltage sampling), a single voltage accumulation method, and insulation detection. The controller 6 is a vehicle controller or a programmable controller, an electronic control unit, etc., which can be selected according to actual needs.

[0055] The fault information of the driving circuit 4 mainly includes short to ground SCG, short to power SCB and open circuit OL; short to ground SCG refers to a short circuit to ground, that is, an unnecessary direct connection path appears between the power side and the ground side of the circuit, which may cause the current to bypass the load that should flow through, thereby possibly causing circuit failure or damage. Short power SCB refers to a short circuit to the power supply, that is, an unnecessary direct connection occurs between the power lines. In this case, the current may exceed the safety range, causing overheating or even damage to the circuit components. Open circuit OL means that the circuit is interrupted and the current cannot flow. This may be caused by broken wires, loose joints, etc. The open circuit diagnosis is used to detect whether the circuit is complete and ensure that the current can flow smoothly. The fault diagnosis in this case is mainly aimed at the fault diagnosis of the secondary circuit, including detection of problems such as relay contact adhesion (sticking together to cause it to be always on) or open circuit (open circuit caused by the failure of the relay contacts to close). Adhesion may cause the power supply and the load to be disconnected, while the open circuit will cause the power supply to be unable to be delivered to the load even if the relay is activated.

[0056] In this case, the drive-level diagnosis of the drive circuit 4 of the relay refers to the inspection of the circuit of the relay control part, that is, the inspection of the primary circuit of the relay to determine whether the circuit of the control part of the relay is working normally. When performing the drive-level diagnosis, for example, the power supply and control signal, circuit element status, etc. can be checked. The power supply and control signal are mainly to confirm whether the power supply and control signal provided to the relay coil meet the requirements to ensure that the relay can work normally; the circuit element status mainly checks whether the components in the circuit (such as transistors, resistors, diodes, etc.) are intact.

[0057] In this case, the driving circuit 4 is controlled by the controller 6, the relay switch 3 is controlled by the driving circuit 4, and the on and off of the charging and discharging circuit is controlled by the relay switch 3, so as to ensure the normal operation of the charging and discharging function and ensure the safety of electricity use; the voltage information of the charging and discharging circuit 7 is collected by the sampling module 5, and the controller 6 is electrically connected to the driving circuit 4 and the sampling module 5, and the working state of the driving circuit 4 is controlled and the fault information of the driving circuit 4 and the circuit information collected by the sampling module 5 are obtained, and the fault type of the automobile charging and discharging circuit is determined according to the fault information and the circuit information; thus, the fault diagnosis system of this case can perform driving-level diagnosis on the driving circuit 4 of the relay switch 3, and can also perform fault (such as adhesion, open circuit) diagnosis on the secondary circuit of the relay switch 3, so as to achieve more comprehensive and accurate fault diagnosis on the automobile charging and discharging circuit, and ensure the safety of electricity use of the automobile charging and discharging circuit; wherein, the secondary circuit refers to the target circuit controlled by the relay switch 3, that is, the downstream circuit operated by the relay switch 3. When the relay contact is closed or disconnected, it will affect the equipment or system connected to the load side, that is, the circuit where the charging and discharging circuit 7 of this case is located.

[0058] like Figure 2 As shown, as an optional embodiment of the present case, the power interface 2 includes an external charging and discharging interface 21 and / or an internal charging and discharging interface 22 and / or an internal charging and discharging interface; the external charging and discharging interface 21 and the internal charging and discharging interface can be connected to both the load and the charging device, and the internal discharging interface 22 is mainly used to connect to the load, such as mobile phones, computers and other electrical or electronic devices.

[0059] like Figure 2 As shown, as an optional embodiment of the present case, the relay switch 3 includes a first relay switch 31 arranged between the external charging and discharging interface 21 and the power distribution unit 1, and / or a second relay switch 32 arranged between the internal discharge interface 22 and the power distribution unit 1; it should be understood that the internal discharge interface 22 can also be replaced by an internal charging and discharging interface, and the external charging and discharging interface 21 can also be replaced by an external discharge interface / external charging interface.

[0060] like Figure 1As shown, as an optional embodiment of the present case, the sampling module 5 at least includes a first sampling unit 51 for collecting circuit information between the relay switch 3 and the power interface 2, and a second sampling unit 52 for collecting circuit information between the power distribution unit 1 and the relay switch 3. It should be noted that by collecting the circuit information of the charge-discharge circuit 7 between the relay switch 3 and the power interface 2 by the first sampling unit 51, it is possible to determine whether the charge-discharge circuit 7 between the relay switch 3 and the power interface 2 has a predetermined available voltage, so that it is possible to determine to a certain extent whether the relay switch 3 is in a working state. If the collection result of the first sampling unit 51 is that there is no voltage in the corresponding charge-discharge circuit 7, the automobile charge-discharge circuit may be a fault of the relay switch 3 or the charge-discharge circuit 7 between the relay switch 3 and the power interface 2 is in an open circuit state. By collecting the circuit information of the charge and discharge circuit 7 between the power distribution unit 1 and the relay switch 3 by the second sampling unit 52, it can be determined whether the charge and discharge circuit 7 between the power distribution unit 1 and the relay switch 3 has power. If the collection result of the second sampling unit 52 is that there is no voltage in the corresponding charge and discharge circuit 7, the fault of the automobile charge and discharge circuit may be a fault of the power distribution unit 1 or a fault that the charge and discharge circuit 7 between the power distribution unit 1 and the relay switch 3 is in an open circuit state.

[0061] like Figure 2 As shown, as an optional embodiment of the present case, the charging and discharging circuit 7 includes a bus 71 and a branch line 72; the bus 71 is electrically connected to the power distribution unit 1; the branch line 72 includes a first branch line 721 electrically connecting the bus 71 and the external charging and discharging interface 21, and a second branch line 722 electrically connecting the bus 71 and the internal discharge interface 22; the branch line 72 can also be provided with a third branch line, a fourth branch line or more branches, the third branch line is used to electrically connect the bus 71 and other required power interfaces 2, and the fourth branch line can be provided similarly; the first relay switch 31 is provided on the first branch line 721, and the second relay switch 32 is provided on the second branch line 722; please refer to Figure 2It should be understood that the line between the second sampling unit 52 and the external charging and discharging interface 21 in the figure is the first branch line 721; the line between the second sampling unit 52 and the internal discharge interface 22 in the figure is the second branch line 722. The first sampling unit 51 includes a first sub-sampling unit 511, a second sub-sampling unit 512 and / or a third sub-sampling unit and a fourth sub-sampling unit set according to actual needs. The first sub-sampling unit 511 is set between the first relay switch 31 of the first branch line 721 and the external charging and discharging interface 21, and the second sub-sampling unit 512 is set between the second relay switch 32 of the second branch line 722 and the internal discharge interface 22; the second sampling unit 52 is set at the electrical connection intersection of the bus 71, the first branch line 721 and the second branch line 722.

[0062] It should be understood that the power distribution unit 1 in this case and the branch line 72 do not need to be connected by the bus 71, and the branch line 72 can be directly electrically connected to the power distribution unit 1, which can be specifically set according to actual needs; it should be understood that the second sampling unit 52 is set at the intersection of the three electrical connections of the bus 71, the first branch line 721 and the second branch line 722, or is set on the bus 71 and adjacent to the intersection of the three electrical connections of the bus 71, the first branch line 721 and the second branch line 722, which can reduce the number of second sampling units 52 set and reduce the difficulty of arranging the sampling module 5. Otherwise, it will be necessary to set a second sampling unit 52 separately for each branch line 72, which is more troublesome and costly; in this case, through the setting of the bus 71, the branch line 72, the first sub-sampling unit 511, the second sub-sampling unit 512 and the second sampling unit 52, it is possible to realize fault detection of the charging and discharging circuit 7 where the external charging and discharging interface 21 is located and the charging and discharging circuit 7 where the internal discharge interface 22 is located.

[0063] like Figure 2 As shown, as an optional embodiment of the present case, the sampling module 5 also includes a third sampling unit 53 for collecting circuit information at the input / output end of the power distribution unit 1.

[0064] It should be noted that, by setting the third sampling unit 53, an additional fault diagnosis function can be added. For example, if the power distribution unit 1 is in a discharging state, and the third sampling unit 53 detects that there is no voltage in the charge and discharge circuit 7, it means that the output of the power distribution unit 1 has failed; if the power distribution unit 1 is in a charging state, the second sampling unit 52 detects that there is voltage, and the third sampling unit 53 detects that there is no voltage, it means that the bus 71 between the second sampling unit 52 and the third sampling unit 53 has an open circuit fault.

[0065] like Figure 3As shown, as an optional embodiment of the present case, the sampling module 5 samples the voltage of the charging and discharging circuit 7 through the sampling board 8. It should be noted that, generally, the controller 6 is a low-voltage controller, and it is impossible to directly sample the voltage of the charging and discharging circuit 7 with a high voltage such as 220V, because directly connecting the charging and discharging circuit 7 may damage the low-voltage controller, and may even cause a safety accident. At the same time, the voltage level of the charging and discharging circuit 7 may greatly exceed the range that the low-voltage controller 6 can safely handle, so a special circuit is required to reduce and stabilize these voltages to a suitable level for accurate measurement; therefore, a sampling board 8 is used to sample the voltage of each sampling point, and the sampling information is fed back to the controller 6 in the form of a level digital signal, such as feedback to the vehicle controller. The sampling board 8 is a device for collecting and processing high-voltage signals. It usually includes components such as voltage divider resistors, filter circuits, voltage regulator protection, and possible channel switching circuits. The main function of the sampling board 8 is to reduce the high-voltage signal to a level suitable for sampling by an analog-to-digital converter.

[0066] like Figure 4 As shown, the present invention provides a method for diagnosing a fault in a charging and discharging circuit of an automobile, which is applied to a controller 6 of a fault diagnosis system for a charging and discharging circuit of an automobile, the system comprising a power distribution unit 1, a power interface 2, a relay switch 3, a drive circuit 4, a sampling module 5 and a controller 6; the power interface 2 is electrically connected to the input / output end of the power distribution unit 1; the relay switch 3 is arranged between the power distribution unit 1 and the power interface 2 to control the on / off state of the charging and discharging circuit; the drive circuit 4 is used to drive the relay switch 3 to operate; the sampling module 5 is used to collect circuit information of the charging and discharging circuit 7, and the sampling module 5 at least comprises a first sampling unit 51 for collecting circuit information between the relay switch 3 and the power interface 2, and a second sampling unit 52 for collecting circuit information between the power distribution unit 1 and the relay switch 31, and / or a third sampling unit 53 for collecting circuit information at the input / output end of the power distribution unit 1; the controller 6 is used to control the working state of the drive circuit 4; the method comprises the following steps:

[0067] S1: Acquire the fault information of the driving circuit 4 and the circuit information collected by the sampling module 5;

[0068] S2: Determine the fault type of the vehicle charging and discharging circuit according to the fault information and the circuit information;

[0069] Among them, the fault types of the automobile charging and discharging circuit at least include relay switch 3 failure and / or charging and discharging circuit 7 open circuit and / or drive circuit 4 short circuit and / or drive circuit 4 open circuit; thus, the automobile charging and discharging circuit fault diagnosis method is within the protection of this case.

[0070] like Figure 2 and Figure 5 As shown in the figure, and in combination with the following Table 1, as an optional embodiment of the present invention, the step S2 of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information includes:

[0071] S21: When the circuit information collected by the first sampling unit 51 and the second sampling unit 52 both indicate that voltage exists, and the fault information of the drive circuit 4 indicates that the relay switch 3 is not driven and no other faults are reported, it is determined that the fault type of the automobile charging and discharging circuit is a relay switch 3 fault. For example, the relay switch 3 fault may be a relay switch 3 adhesion fault, such as K1 adhesion and / or K2 adhesion. The fault affects electricity safety. The fault information only needs to express that the relay switch 3 is not driven, and there may be multiple ways of expression.

[0072] For example, when the circuit information of the first sub-sampling unit 511 and the second sampling unit 52 both show that voltage exists, and the fault information of the first drive circuit 41 of the first relay switch 31 is that the first relay switch 31 is not driven and no other faults are reported, it is determined that the fault type of the automobile charging and discharging circuit is a first relay switch 31 fault, for example, the first relay switch 31 fault may be a first relay switch 31 adhesion, wherein the first relay switch 31 adhesion is referred to as K1 adhesion, and the fault impact is electricity safety;

[0073] For example, when the circuit information of the second sub-sampling unit 512 and the second sampling unit 52 both show that voltage exists, and the fault information of the second drive circuit 42 of the second relay switch 32 is that the second relay switch 32 is not driven and no other faults are reported, it is determined that the fault type of the automobile charging and discharging circuit is a second relay switch 32 fault, for example, the second relay switch 32 fault may be a second relay switch 32 adhesion, wherein the second relay switch 32 adhesion is referred to as K2 adhesion, and the fault impact is electricity safety;

[0074] like Figure 2 and Figure 5 As shown in the figure, and in combination with the following Table 1, as an optional embodiment of the present case, the step S2 of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes:

[0075] S22: When one of the circuit information collected by the first sampling unit 51 and the second sampling unit 52 indicates that there is no voltage and the other indicates that there is voltage, and the fault information of the drive circuit 4 indicates that the drive circuit 4 is driven normally and no other faults are reported, that is, the drive circuit 4 does not report or display a fault, then it is determined that the fault type of the automobile charging and discharging circuit is that the charging and discharging circuit 7 between the voltage distribution unit 1 and the power interface 2 is open, and the fault impact is a functional failure; wherein, the fault information only needs to express that the relay switch 3 is in normal driving, and there can be multiple expressions;

[0076]

[0077] In an optional embodiment of the present invention, when one of the circuit information collected by the first sampling unit 51 and the second sampling unit 52 indicates that there is no voltage and the other indicates that there is voltage, and the drive circuit 4 is driven normally and no other faults are reported, the step of determining that the fault type of the automobile charging and discharging circuit is that the charging and discharging circuit between the voltage distribution unit 1 and the power interface 2 is open 7 also includes:

[0078] When the circuit information collected by the first sampling unit 51 indicates that there is no voltage, and the circuit information collected by the second sampling unit 52 indicates that there is voltage, and the drive circuit 7 is driven normally and no other faults are reported, it is determined that the fault type of the automobile charging and discharging circuit is that the charging and discharging circuit 7 between the relay switch 3 and the power interface 2 is open;

[0079] When the circuit information collected by the first sampling unit 51 shows that there is voltage, the circuit information collected by the second sampling unit 52 shows that there is no voltage, and the driving circuit 7 is driven normally and no other faults are reported, it is determined that the fault type of the automobile charging and discharging circuit is that the charging and discharging circuit 7 between the relay switch 3 and the power distribution unit 1 is open.

[0080] For example, when the controller 6 detects that the power distribution unit 1 is in a discharging state, and the circuit information collected by the first sub-sampling unit 511 is that there is no voltage, the circuit information collected by the second sampling unit 52 is that there is voltage, and the fault information of the first drive circuit 41 of the first relay switch 31 is that the first relay switch 31 is driven normally and no other faults are reported, that is, the first drive circuit 41 of the first relay switch 31 does not report or display a fault, then it is determined that the fault type of the automobile charging and discharging circuit is that the first branch line 721 between the first relay switch 31 and the external charging and discharging interface 21 is open or the wire between the armature and the moving contact of the first relay switch 31 is open;

[0081] For example, when the controller 6 detects that the power distribution unit 1 is in a charging state, and the circuit information collected by the first sub-sampling unit 511 is that there is voltage, the circuit information collected by the second sampling unit 52 is that there is no voltage, and the fault information of the first drive circuit 41 of the first relay switch 31 is that the first relay switch 31 is driven normally and no other faults are reported, that is, the first drive circuit 41 of the first relay switch 31 does not report or display a fault, then it is determined that the fault type of the automobile charging and discharging circuit is that the first branch line 721 between the first relay switch 31 and the external charging and discharging interface 21 is open or the wire between the armature and the moving contact of the first relay switch 31 is open;

[0082] For example, when the controller 6 detects that the power distribution unit 1 is in a discharging state, and the circuit information collected by the second sub-sampling unit 512 is that there is no voltage, the circuit information collected by the second sampling unit 52 is that there is voltage, and the second drive circuit 42 of the second relay switch 32 is driven normally and no other faults are reported, that is, the second drive circuit 42 of the second relay switch 32 does not report or display a fault, then it is determined that the fault type of the automobile charging and discharging circuit is that the second branch line 722 between the second relay switch 32 and the in-vehicle discharge interface 22 is open or the wire between the armature and the moving contact of the second relay switch 32 is open;

[0083] For example, when the controller 6 detects that the power distribution unit 1 is in a charging state, and the circuit information collected by the second sub-sampling unit 512 is that there is voltage, the circuit information collected by the second sampling unit 52 is that there is no voltage, and the second drive circuit 42 of the second relay switch 32 is driven normally and no other faults are reported, that is, the second drive circuit 42 of the second relay switch 32 does not report or display a fault, then it is determined that the fault type of the automobile charging and discharging circuit is that the second branch line 722 between the second relay switch 32 and the in-vehicle discharge interface 22 is open or the wire between the armature and the moving contact of the second relay switch 32 is open;

[0084] like Figure 2 and Figure 5 As shown in the figure, and in combination with the following Table 2, as an optional embodiment of the present invention, the step S2 of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes:

[0085] S23: When the circuit information collected by the first sampling unit 51 and the second sampling unit 52 both indicate that there is voltage, and the fault information of the drive circuit 4 is a circuit short circuit, it is determined that the fault type of the vehicle charging and discharging circuit is that the drive circuit 4 is short-circuited to the power supply or short-circuited to the ground, the short-circuit to the power supply is referred to as SCB, and the short-circuit to the ground is referred to as SCG. The impact of the fault is electricity safety. The fault information only needs to express that the relay switch 3 is in a power short circuit fault, and there can be multiple expressions;

[0086] For example, when the circuit information collected by the first sub-sampling unit 511 and the second sampling unit 52 both indicate that voltage exists, and the fault information of the first drive circuit 41 of the first relay switch 31 is a circuit short circuit, then it is determined that the fault type of the automobile charging and discharging circuit is a short circuit of the first drive circuit 41 of the first relay switch 31. The short circuit of the first drive circuit 41 includes a short circuit of the live wire (high side) to the power supply or a short circuit of the neutral wire (low side) to the ground. The impact of this fault is electricity safety, while the neutral wire (low side) is short-circuited to the power supply or the live wire (high side) is short-circuited to the ground. This fault is a functional failure. Generally, the voltage after the live wire is connected is a voltage of 220V or fluctuates within a certain threshold above and below 220V and meets the voltage for use. The voltage of the neutral wire is a voltage of 0V or fluctuates within a certain threshold at 0V and meets the voltage for use. It should be understood that the voltages of the live wire and the neutral wire can also be other voltages that meet the use requirements.

[0087] For example, when the circuit information collected by the second sub-sampling unit 512 and the second sampling unit 52 both indicate that voltage exists, and the fault information of the second drive circuit 42 of the second relay switch 32 is a circuit short circuit, it is determined that the fault type of the automobile charging and discharging circuit is a short circuit of the second drive circuit 42 of the second relay switch 32. The short circuit of the second drive circuit 42 includes a live wire (high side) short circuit to the power supply or a neutral wire (low side) short circuit to the ground. The impact of this fault is electricity safety, while a neutral wire (low side) short circuit to the power supply or a live wire (high side) short circuit to the ground is a functional failure.

[0088] like Figure 2 and Figure 5 As shown in the figure, and in combination with the following Table 2, as an optional embodiment of the present invention, the step S2 of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes:

[0089] S24: When one of the circuit information collected by the first sampling unit 51 and the second sampling unit 52 indicates that there is no voltage and the other indicates that there is voltage, and the fault information of the drive circuit 4 is open circuit, referred to as OL, it is determined that the fault type of the vehicle charging and discharging circuit is open circuit of the drive circuit 4, wherein the fault information only needs to express that the relay switch 3 is in an open circuit fault, and there can be multiple expressions;

[0090] For example, when the controller 6 detects that the power distribution unit 1 is in a discharging state, and when the circuit information collected by the first sub-sampling unit 511 is that there is no voltage, the circuit information collected by the second sampling unit 52 is that there is voltage, and the fault information of the first drive circuit 41 of the first relay switch 31 is open circuit, abbreviated as OL, then it is determined that the fault type of the automobile charging and discharging circuit is that the first drive circuit 41 of the first relay switch 31 is open circuit.

[0091]

[0092] For example, when the controller 6 detects that the power distribution unit 1 is in a charging state, and when the circuit information collected by the first sub-sampling unit 511 is that voltage exists, the circuit information collected by the second sampling unit 52 is that no voltage exists, and the fault information of the first drive circuit 41 of the first relay switch 31 is open circuit, abbreviated as OL, then it is determined that the fault type of the vehicle charging and discharging circuit is that the first drive circuit 41 of the first relay switch 31 is open circuit.

[0093] For example, when the controller 6 detects that the power distribution unit 1 is in a discharging state, and when the circuit information collected by the second sub-sampling unit 511 is that there is no voltage, the circuit information collected by the second sampling unit 52 is that there is voltage, and the fault information of the drive circuit 4 of the second relay switch 31 is open circuit, abbreviated as OL, then it is determined that the fault type of the automobile charging and discharging circuit is that the second drive circuit 42 of the second relay switch 32 is open circuit.

[0094] For example, when the controller 6 detects that the power distribution unit 1 is in a charging state, and when the circuit information collected by the second sub-sampling unit 511 is that there is voltage, the circuit information collected by the second sampling unit 52 is that there is no voltage, and the fault information of the drive circuit 4 of the second relay switch 31 is open circuit, abbreviated as OL, then it is determined that the fault type of the vehicle charging and discharging circuit is that the second drive circuit 42 of the second relay switch 32 is open circuit.

[0095] It should be noted that the display of voltage generally refers to the voltage corresponding to the charging and discharging circuit 7 being a first voltage that can be used, such as a voltage of 220V or a voltage that fluctuates within a certain threshold above and below 220V and meets the requirements for use. The display of no voltage generally refers to the voltage corresponding to the charging and discharging circuit 7 being a second voltage that cannot meet the requirements for use, such as a 0V voltage or a 0.5V voltage that cannot meet the requirements for use. At this time, the charging and discharging circuit 7 is generally in a power-off state. The controller 6 described in this case is generally a vehicle controller, in which the vehicle controller is responsible for driving the first relay switch 31 and the second relay switch 32 to turn on and off the driving circuit 4 to control the on-off state of the external charging and discharging interface 21, the internal discharge interface 22 and the power distribution unit 1. When K1 is closed, the user can connect the car through a slow charging gun and charge the car battery; or can also discharge other vehicles or external loads through a compatible discharge gun. When K2 is closed, the user can use the internal discharge interface 22 to discharge the car battery outward. In addition, K1 and K2 can be closed at the same time, and the car battery supports discharging to the discharge interface inside / outside the car at the same time. At the same time, the vehicle controller of this case supports short-to-ground SCG, short-to-power SCB and open-circuit OL diagnosis of the drive circuit 4 of the relays K1 and K2. In order to ensure normal functions and ensure electricity safety, the real working state of the K1 and K2 relays is monitored in this case. For example, three sampling points are added, such as the first sub-sampling unit 511, the second sub-sampling unit 512 and the second sampling unit 52, to sample the voltage in the charge and discharge circuit 7 (the circuit where the relay switch 3 is located). Generally, through circuit design, when there is a voltage at the sampling point of the sampling unit 5 (such as a 220V voltage that meets the use requirements), the feedback signal outputs a high level to the vehicle controller, and when there is no voltage at the sampling point, the feedback signal outputs a low level to the vehicle controller. By combining the voltage information of the three sampling points with the driving state of the drive circuit 4 of the K1 and K2 relays obtained by the vehicle controller, the fault of the entire system can be monitored more completely.

[0096] It should be pointed out that the normal driving state indicated in Table 1 means that the driving circuit 4 of the relay is in the output state and cannot report other faults (such as SCB and OL faults). For example, when the vehicle driver drives the driving circuit 4 of the K1 relay, but the output end of the K1 relay reports an OL fault, the voltage collected by the second sampling unit 52 should be 220V, while the voltage collected by the first sub-sampling unit 511 is 0V, which will also make the function of the external charging and discharging interface 21 invalid. However, the cause of the fault at this time is that the driving circuit 4 of the first relay switch 31 is open, not the charging and discharging circuit is open, which is different from the cause of the fault in Table 1, and the fault judgment should be distinguished; therefore, in combination with Table 1 and Table 2, through the above scheme, combined with the driving state of the driving circuit 4, the driving level diagnosis, and the sampling of the sampling module, the cause of the fault in the charging and discharging circuit of the vehicle can be comprehensively judged.

[0097] As an optional embodiment of the present case, the step S2 of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes:

[0098] S25: When the controller 6 detects that the power distribution unit 1 is in a discharging state, and the circuit information collected by the third sampling unit 53 shows that there is no voltage, such as the voltage is 0V, it is determined that the fault type of the automobile charging and discharging circuit is output failure of the power distribution unit 1, which can also be called power pipeline system output failure.

[0099] As an optional embodiment of the present case, the step S2 of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes:

[0100] S26: When the controller 6 detects that the power distribution unit 1 is in the charging state, and the circuit information collected by the second sampling unit 52 shows that there is voltage, such as the voltage is 220V, and the circuit information collected by the third sampling unit 53 shows that there is no voltage, such as the voltage is 0V, then it is determined that the fault type of the vehicle charging and discharging circuit is that the charging and discharging circuit 7 between the second sampling unit 52 and the third sampling unit 53 is open.

[0101] As an optional embodiment of the present case, during discharge, when the circuit information collected by the first sampling unit 51 is that there is no voltage, the circuit information collected by the second sampling unit 52 is that there is voltage, or during charging, when the circuit information collected by the first sampling unit 51 is that there is voltage, the circuit information collected by the second sampling unit 52 is that there is no voltage; that is, when one of the circuit information collected by the first sampling unit 51 and the second sampling unit 52 is that there is no voltage and the other is that there is voltage, and the fault information of the drive circuit 4 is that the relay switch 3 is driven normally and no other faults are reported, that is, when the drive circuit 4 does not report or display a fault, then determining that the fault type of the automobile charging and discharging circuit is that the charging and discharging circuit 7 between the relay switch 3 and the power interface 2 is an open circuit fault S22 step includes:

[0102] S221: Acquiring fault information of the driving circuit 4 through the controller 6;

[0103] S222: Obtain the output state of the relay switch 3;

[0104] S223: When the fault information of the driving circuit 4 is no fault, and the output state of the relay switch 3 itself is normal, it is determined that the relay switch 3 is driven normally. The fault information here is no fault, which only needs to express the meaning of no fault.

[0105] As an optional embodiment of the present case, the output state of the relay switch 3 may be obtained by the following steps:

[0106] Obtaining the voltage across the primary coil of the relay switch 3, where the primary coil is the coil of the relay switch 3 itself;

[0107] Comparing the voltage across the primary coil of the relay switch 3 with the rated voltage across the relay switch 3;

[0108] When the voltage across the coil of the relay switch 3 is equal to the rated voltage across the relay switch 3 , it is determined that the relay switch 3 is in a normal driving state; otherwise, it is determined that the relay switch 3 is in a non-driving state.

[0109] The driving state of the relay control terminal refers to the closing and opening state of the contacts when the relay coil is not energized or energized. In this case, each relay refers to the normally open state. Normally open contacts, when the relay coil is not energized, the moving contacts and the normally open static contacts are in the open state. Only when the coil is energized to generate a magnetic field to attract the moving contacts, will these contacts close, thereby allowing current to pass.

[0110] The present invention also provides an automobile charging and discharging circuit fault diagnosis device, comprising a memory and a processor, wherein the memory stores a computer-readable program, and when the computer-readable program is called by the processor, the steps of the automobile charging and discharging circuit fault diagnosis method can be executed.

[0111] The present invention also provides a computer-readable storage medium on which computer-readable instructions are stored. When the computer-readable instructions are executed by a processor of a computer, the computer executes the steps of the automobile charging and discharging circuit fault diagnosis method.

[0112] The present invention also provides a vehicle, comprising the automobile charging and discharging circuit fault diagnosis system, so that the vehicle having the automobile charging and discharging circuit fault diagnosis system is also within the protection scope of this case.

[0113] Among them, the memory includes at least one type of readable storage medium, and the readable storage medium includes flash memory, mobile hard disk, multimedia card, card-type memory, magnetic memory, disk, optical disk, etc. The memory can be an internal storage unit of an electronic device in some embodiments, such as a mobile hard disk of the electronic device. The memory can also be an external storage device of an electronic device in other embodiments, such as a plug-in mobile hard disk, smart memory card, secure digital (SD) card, flash memory card, etc. equipped on the electronic device. Further, the memory can also include both an internal storage unit of the electronic device and an external storage device. The memory can not only be used to store application software and various types of data installed in the electronic device, such as a car charging and discharging circuit fault diagnosis system, but also can be used to temporarily store data that has been output or is to be output.

[0114] In some embodiments, the processor may be composed of an integrated circuit, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units, microprocessors, digital processing chips, graphics processors, and a combination of various control chips. The processor is the control core of the electronic device, and uses various interfaces and lines to connect the various components of the entire electronic device. It runs or executes programs or modules stored in the memory (for example, executing the automotive charging and discharging circuit fault diagnosis system program, etc.), and calls the data stored in the memory to execute various functions of the electronic device and process data.

[0115] The processor executes the operating system of the electronic device and various installed application programs. The processor executes the application programs to implement the steps in the above-mentioned embodiments of the automobile charging and discharging circuit fault diagnosis method, such as the steps shown in the figure.

[0116] Exemplarily, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program in the electronic device.

[0117] The above-mentioned integrated unit implemented in the form of a software function module can be stored in a computer-readable storage medium. The above-mentioned software function module is stored in a storage medium, and includes a number of instructions for enabling a computer device (which can be a personal computer, a computer device, or a network device, etc.) or a processor to perform part of the functions of the automobile charging and discharging circuit fault diagnosis method described in various embodiments of the present invention.

[0118] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

[0119] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or with other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0120] The above description of the illustrated embodiments of the present invention (including that described in the Abstract) is not intended to be exhaustive or to limit the present invention to the precise form disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention as will be recognized and appreciated by those skilled in the art. As noted, these modifications may be made to the present invention in accordance with the above description of the embodiments described in the present invention, and these modifications will be within the spirit and scope of the present invention.

[0121] Systems and methods have been generally described herein as details that aid in understanding the present invention. In addition, various specific details have been given to provide an overall understanding of embodiments of the present invention. However, those skilled in the relevant art will recognize that embodiments of the present invention may be practiced without one or more of the specific details, or may be practiced using other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid confusion with various aspects of embodiments of the present invention.

[0122] Thus, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the foregoing disclosure, and it should be understood that in some cases, some features of the invention will be employed without the corresponding use of other features without departing from the scope and spirit of the proposed invention. Thus, many modifications may be made to adapt a particular environment or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terms used in the claims below and / or the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Thus, the scope of the invention will be determined solely by the appended claims.

Claims

1. A vehicle charging and discharging circuit fault diagnosis system, characterized in that: include: Power distribution unit; A power interface, electrically connected to an input / output terminal of the power distribution unit; A relay switch is provided between the power distribution unit and the power interface to control the on / off state of the charge and discharge circuit; A driving circuit, used for driving the relay switch action; A sampling module, used for collecting circuit information of the charging and discharging circuit; A controller, used to control the working state of the driving circuit, obtain the fault information of the driving circuit and the circuit information, and determine the fault type of the vehicle charging and discharging circuit according to the fault information and the circuit information; Wherein, the fault type of the automobile charging and discharging circuit at least includes relay switch failure and / or charging and discharging circuit open circuit and / or drive circuit short circuit and / or drive circuit open circuit.

2. The automotive charging and discharging circuit fault diagnosis system according to claim 1, characterized in that: The power supply interface includes an external charging and discharging interface and / or an internal discharging interface.

3. The automobile charging and discharging circuit fault diagnosis system according to claim 2, characterized in that: The relay switch includes a first relay switch arranged between the off-vehicle charging and discharging interface and the power distribution unit, and / or a second relay switch arranged between the on-vehicle discharging interface and the power distribution unit.

4. The automobile charging and discharging circuit fault diagnosis system according to claim 3, characterized in that: The sampling module at least includes a first sampling unit for collecting circuit information between the relay switch and the power interface, and a second sampling unit for collecting circuit information between the power distribution unit and the relay switch.

5. The automobile charging and discharging circuit fault diagnosis system according to claim 4, characterized in that: The charging and discharging circuit comprises: A bus, electrically connected to the power distribution unit; Branch lines, including a first branch line electrically connecting the bus and the off-vehicle charging and discharging interface, and a second branch line electrically connecting the bus and the on-vehicle discharging interface; The first relay switch is arranged on the first branch line, and the second relay switch is arranged on the second branch line; The first sampling unit includes a first sub-sampling unit and a second sub-sampling unit, the first sub-sampling unit is arranged between the first relay switch of the first branch line and the off-vehicle charging and discharging interface, and the second sub-sampling unit is arranged between the second relay switch of the second branch line and the on-vehicle discharging interface; The second sampling unit is disposed at an electrical connection junction of the bus, the first branch line and the second branch line.

6. The automobile charging and discharging circuit fault diagnosis system according to claim 5, characterized in that: The sampling module further includes a third sampling unit for collecting circuit information at the input / output terminal of the power distribution unit.

7. A method for diagnosing faults in automobile charging and discharging circuits, characterized in that: A controller for a fault diagnosis system of an automobile charging and discharging circuit, the system comprising a power distribution unit, a power interface, a relay switch, a drive circuit, a sampling module and a controller; the power interface is electrically connected to an input / output terminal of the power distribution unit; the relay switch is arranged between the power distribution unit and the power interface to control the on / off state of the charging and discharging circuit; the drive circuit is used to drive the relay switch to operate; The sampling module is used to collect circuit information of the charging and discharging circuit, and the sampling module at least includes a first sampling unit for collecting circuit information between the relay switch and the power interface, and a second sampling unit for collecting circuit information between the power distribution unit and the relay switch, and / or a third sampling unit for collecting circuit information at the input / output end of the power distribution unit; the controller is used to control the working state of the driving circuit; the method comprises the following steps: Acquiring fault information of the driving circuit and circuit information collected by the sampling module; Determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information; Wherein, the fault type of the automobile charging and discharging circuit at least includes relay switch failure and / or charging and discharging circuit open circuit and / or drive circuit short circuit and / or drive circuit open circuit.

8. The method for diagnosing faults in a vehicle charging and discharging circuit according to claim 7, characterized in that: The step of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information comprises: When the circuit information collected by the first sampling unit and the second sampling unit both indicate that voltage exists, and the driving circuit is not driven and no other faults are reported, it is determined that the fault type of the automobile charging and discharging circuit is a relay switch fault.

9. The method for diagnosing faults in a vehicle charging and discharging circuit according to claim 7, characterized in that: The step of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes: When one of the circuit information collected by the first sampling unit and the second sampling unit shows that there is no voltage and the other shows that there is voltage, and the driving circuit is driven normally and no other faults are reported, it is determined that the fault type of the automobile charging and discharging circuit is that the charging and discharging circuit between the power distribution unit and the power interface is open.

10. The method for diagnosing faults in a vehicle charging and discharging circuit according to claim 8, characterized in that: When one of the circuit information collected by the first sampling unit and the second sampling unit indicates that there is no voltage and the other indicates that there is voltage, and the driving circuit is driven normally and no other faults are reported, the step of determining that the fault type of the automobile charging and discharging circuit is that the charging and discharging circuit between the voltage distribution unit and the power interface is open also includes: When the circuit information collected by the first sampling unit indicates that there is no voltage, and the circuit information collected by the second sampling unit indicates that there is voltage, and the driving circuit is driven normally and no other faults are reported, it is determined that the fault type of the automobile charging and discharging circuit is that the charging and discharging circuit between the relay switch and the power interface is open; When the circuit information collected by the first sampling unit shows that voltage exists, and the circuit information collected by the second sampling unit shows that no voltage exists, and the driving circuit is driven normally and no other faults are reported, it is determined that the fault type of the automobile charging and discharging circuit is that the charging and discharging circuit between the relay switch and the power distribution unit is open.

11. The method for diagnosing faults in a vehicle charging and discharging circuit according to claim 7, characterized in that: The step of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes: When the circuit information collected by the first sampling unit and the second sampling unit both indicate that voltage exists, and the fault information of the drive circuit is a circuit short circuit, it is determined that the fault type of the vehicle charging and discharging circuit is a drive circuit short circuit.

12. The method for diagnosing faults in a vehicle charging and discharging circuit according to claim 7, characterized in that: The step of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit voltage also includes: When one of the circuit information collected by the first sampling unit and the second sampling unit indicates that there is no voltage and the other indicates that there is voltage, and the fault information of the drive circuit is open circuit, it is determined that the fault type of the vehicle charging and discharging circuit is open circuit of the drive circuit.

13. The method for diagnosing faults in a vehicle charging and discharging circuit according to claim 7, characterized in that: The step of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes: When the controller detects that the power distribution unit is in a discharging state and the circuit information collected by the third sampling unit indicates that there is no voltage, it is determined that the fault type of the automobile charging and discharging circuit is a power distribution unit output failure.

14. The method for diagnosing faults in a vehicle charging and discharging circuit according to claim 7, characterized in that: The step of determining the fault type of the automobile charging and discharging circuit according to the fault information and the circuit information further includes: When the controller detects that the power distribution unit is in a charging state, the circuit information collected by the second sampling unit shows that voltage exists, and the circuit information collected by the third sampling unit shows that no voltage exists, it is determined that the fault type of the vehicle charging and discharging circuit is that the charging and discharging circuit between the second sampling unit and the third sampling unit is open.

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