Fault processing method and device of fuel cell vehicle system and vehicle

Abstract

The invention discloses a fault processing method and device of a fuel cell vehicle system and a vehicle, and relates to the technical field of vehicle control. A specific embodiment of the method comprises the following steps: in response to detection of a fault of a storage battery, controlling a fuel cell converter, a boost converter and a vehicle auxiliary engine except a low-voltage buck converter and a storage battery temperature control box to stop running; controlling the fuel cell to continue to operate, so that the fuel cell directly supplies power to the load; the first inverter, the second inverter, the step-down converter, the fuel cell auxiliary machine, the low-voltage step-down converter and the storage battery temperature control box are controlled to stop running; a relay of the storage battery is cut off; the boost converter, the buck converter, the fuel cell auxiliary machine, the vehicle auxiliary machine, the first inverter and the second inverter are controlled to be started again, so that the vehicle enters the limping mode; and detecting whether the relay is sintered. The fault processing method of the fuel cell vehicle system can respond to the driving demand of the user as soon as possible.

Description

Technical Field

[0001] The present invention relates to the field of fuel cell technology, and in particular to a method, device and vehicle for troubleshooting a fuel cell vehicle system. Background Art

[0002] In the prior art, there is a load between the battery and the boost converter. If a battery failure is detected, the power system needs to be stopped for a very short time to detect whether the relay is sintered. Then the user will feel that some vehicle auxiliary equipment has failed for a short time and the throttle has temporarily lost response. Therefore, the user's driving needs cannot be met for a period of time, resulting in a poor user experience and possible danger. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a fault handling method, device and vehicle for a fuel cell vehicle system to solve the technical problem that if a battery fault is detected, the power system needs to be stopped to detect whether the relay is sintered.

[0004] To achieve the above object, an embodiment of the present invention provides a method for troubleshooting a fuel cell vehicle system, comprising the following steps:

[0005] In response to detecting a battery failure, controlling a fuel cell converter, a boost converter, and vehicle auxiliary machines other than a low-voltage buck converter and a battery temperature control box to stop operating;

[0006] Controlling the fuel cell to continue to operate so that the fuel cell directly supplies electricity to the load;

[0007] Control the first inverter, the second inverter, the buck converter, the fuel cell auxiliary machine, the low-voltage buck converter, and the battery temperature control box to stop running;

[0008] Cut off the battery relay;

[0009] Controlling the boost converter, the buck converter, the fuel cell auxiliary machine, the vehicle auxiliary machine, the first inverter, and the second inverter to restart so that the vehicle enters a limp home mode;

[0010] Detect whether the relay is sintered.

[0011] Optionally, detecting whether the relay is sintered includes:

[0012] Determining whether an input current of the boost converter is less than or equal to a current threshold, and whether an input voltage of the boost converter is less than or equal to a voltage threshold;

[0013] In response to the input current of the boost converter being less than or equal to a current threshold and the input voltage of the boost converter being less than or equal to a voltage threshold, controlling the boost converter and the battery temperature control box to stop operating, and controlling the vehicle to continue to be in limp home mode;

[0014] In response to an input current of the boost converter being greater than a current threshold or an input voltage of the boost converter being greater than a voltage threshold, power to the vehicle is shut down.

[0015] Optionally, after the vehicle enters the limp home mode, the fault handling method further includes:

[0016] In response to receiving a power-off instruction submitted by a user, power of the vehicle is turned off.

[0017] Optionally, after the vehicle enters the limp home mode, the fault handling method further includes:

[0018] In response to detecting a failure of a component other than the battery, power to the vehicle is shut down.

[0019] Optionally, the fuel cell vehicle system comprises:

[0020] A fuel cell for supplying power to the load; wherein the load includes an electric motor, an air compressor and an auxiliary machine, and the auxiliary machine includes a vehicle auxiliary machine and a fuel cell auxiliary machine;

[0021] a fuel cell converter connected between the fuel cell and the load, for increasing the voltage output from the fuel cell;

[0022] A battery for supplying electric power to the load;

[0023] a boost converter, connected between the battery and the load, for boosting the voltage output from the battery;

[0024] a buck converter connected between the boost converter and the auxiliary machine and configured to reduce a voltage output from the boost converter and a voltage output from the fuel cell converter;

[0025] a first inverter connected between the fuel cell converter and the motor, and connected between the boost converter and the motor;

[0026] a second inverter connected in parallel with the first inverter and connected to the air compressor;

[0027] Among them, the vehicle auxiliary machine includes a low-voltage buck converter and a battery temperature control box, the low-voltage buck converter is connected to the output end of the buck converter, and the battery temperature control box is connected to the output end of the fuel cell converter and the output end of the boost converter.

[0028] Optionally, the boost converter is used to increase the voltage output by the battery from a first voltage to a second voltage, and the buck converter is used to reduce the voltage output by the boost converter from the second voltage to a third voltage, wherein the third voltage is higher than the first voltage.

[0029] In addition, according to another aspect of an embodiment of the present invention, a fault handling device for a fuel cell vehicle system is provided, the device comprising:

[0030] a first control unit, for controlling the fuel cell converter, the boost converter, and the vehicle auxiliary machines except the low-voltage buck converter and the battery temperature control box to stop running in response to detecting a battery failure; controlling the fuel cell to continue running so that the fuel cell directly supplies power to the load; controlling the first inverter, the second inverter, the buck converter, the fuel cell auxiliary machine, the low-voltage buck converter, and the battery temperature control box to stop running; disconnecting the battery relay; controlling the boost converter, the buck converter, the fuel cell auxiliary machine, the vehicle auxiliary machine, the first inverter, and the second inverter to start again so that the vehicle enters a limp home mode;

[0031] The second control unit is used to detect whether the relay is sintered.

[0032] Optionally, the second control unit is further used for:

[0033] Determining whether an input current of the boost converter is less than or equal to a current threshold, and whether an input voltage of the boost converter is less than or equal to a voltage threshold;

[0034] In response to an input current of the boost converter being less than or equal to a current threshold and an input voltage of the boost converter being less than or equal to a voltage threshold, controlling the boost converter and the battery temperature control box to stop operating, and continuing to control the vehicle to be in a limp home mode;

[0035] In response to an input current of the boost converter being greater than a current threshold or an input voltage of the boost converter being greater than a voltage threshold, power to the vehicle is shut down.

[0036] Optionally, the second control unit is further used for:

[0037] After the vehicle enters the limp home mode, in response to receiving a power off command submitted by a user, the power of the vehicle is turned off.

[0038] Optionally, the second control unit is further used for:

[0039] After the vehicle enters the limp home mode, in response to detecting a failure of a component other than the battery, power to the vehicle is shut down.

[0040] Optionally, the fuel cell vehicle system comprises:

[0041] A fuel cell for supplying power to the load; wherein the load includes an electric motor, an air compressor and an auxiliary machine, and the auxiliary machine includes a vehicle auxiliary machine and a fuel cell auxiliary machine;

[0042] a fuel cell converter connected between the fuel cell and the load, for increasing the voltage output from the fuel cell;

[0043] A battery for supplying electric power to the load;

[0044] a boost converter connected between the battery and the motor and configured to boost the voltage output from the battery;

[0045] a buck converter connected between the boost converter and the auxiliary machine and configured to reduce a voltage output from the boost converter and a voltage output from the fuel cell converter;

[0046] a first inverter connected between the fuel cell converter and the motor, and connected between the boost converter and the motor;

[0047] a second inverter connected in parallel with the first inverter and connected to the air compressor;

[0048] Among them, the vehicle auxiliary machine includes a low-voltage buck converter and a battery temperature control box, the low-voltage buck converter is connected to the output end of the buck converter, and the battery temperature control box is connected to the output end of the fuel cell converter and the output end of the boost converter.

[0049] Optionally, the boost converter is used to increase the voltage output by the battery from a first voltage to a second voltage, and the buck converter is used to reduce the voltage output by the boost converter from the second voltage to a third voltage, wherein the third voltage is higher than the first voltage.

[0050] In addition, according to another aspect of an embodiment of the present invention, a vehicle is provided, including a fuel cell vehicle system and a fault handling device for the fuel cell vehicle system described in any one of the above embodiments.

[0051] According to another aspect of an embodiment of the present invention, there is further provided an electronic device, including:

[0052] one or more processors;

[0053] a storage device for storing one or more programs,

[0054] When the one or more programs are executed by the one or more processors, the one or more processors implement the method described in any one of the above embodiments.

[0055] According to another aspect of an embodiment of the present invention, a computer-readable medium is provided, on which a computer program is stored. When the program is executed by a processor, the method described in any one of the above embodiments is implemented.

[0056] The fault handling method of the fuel cell vehicle system provided by the embodiment of the present invention controls the vehicle to enter the limp home mode when a battery fault is detected, and detects whether the relay is sintered after the vehicle enters the limp home mode, without the need to control the power system to stop to detect the relay, so that the user's driving needs can be responded to as soon as possible. Compared with the prior art, which requires a certain amount of time for relay sintering detection before entering the limp home mode, the embodiment of the present invention performs relay sintering detection in the limp home mode, thereby achieving the goal of responding to the user's driving needs more quickly.

[0057] The further effects of the above-mentioned non-conventional optional manner will be described below in conjunction with the specific implementation manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0059] Figure 1 is a schematic structural diagram of a fuel cell vehicle system according to an embodiment of the present invention;

[0060] Figure 2 is a flow chart of a method for troubleshooting a fuel cell vehicle system according to a first embodiment of the present invention;

[0061] Figure 3 is a flow chart of a method for troubleshooting a fuel cell vehicle system according to a second embodiment of the present invention;

[0062] Figure 4 is a schematic diagram of a fault handling device for a fuel cell vehicle system according to an embodiment of the present invention.

[0063] The reference numerals are as follows:

[0064] 11- Fuel cell;

[0065] 12- Fuel cell converter;

[0066] 13-Battery;

[0067] 14- Electric motor;

[0068] 15-Boost converter;

[0069] 16- Buck converter;

[0070] 17- Fuel cell auxiliary machine;

[0071] 18-Vehicle auxiliary machine;

[0072] 19-Battery temperature control box;

[0073] 20- low voltage buck converter;

[0074] 21- Air compressor;

[0075] 22- first inverter;

[0076] 23- second inverter;

[0077] 24-Relay. DETAILED DESCRIPTION

[0078] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0079] Figure 1 1 is a schematic diagram of the structure of a fuel cell vehicle system according to an embodiment of the present invention. The fuel cell system is installed in a fuel cell electric vehicle as a system for supplying power for driving. The fuel cell system supplies power to a load, which includes an electric motor 14 and an auxiliary machine, which may include a fuel cell auxiliary machine 17, an air compressor (ACP) 21, and a vehicle auxiliary machine 18.

[0080] like Figure 1As shown, the fuel cell vehicle system includes a fuel cell 11, a fuel cell converter 12, a battery 13, a boost converter 15, a buck converter 16, a first inverter 22 and a second inverter 23; wherein the fuel cell 11 is used to supply power to the load, the fuel cell converter 12 is connected between the fuel cell 11 and the load, and is used to increase the voltage output from the fuel cell 11 (for example, from 300V to 600V); the battery 13 is used to supply power to the load; the boost converter 15 is connected between the battery 13 and the motor 14, and is used to increase the voltage output from the battery 13; the buck converter 16 is connected between the boost converter 15 and the auxiliary machine 17, and is used to reduce the voltage output from the boost converter 15 and the voltage output from the fuel cell converter 12; the first inverter 22 is connected between the fuel cell converter 12 and the motor 14, and, is connected between the boost converter 15 and the motor 14; the second inverter 23 is connected in parallel with the first inverter 22, and is connected to the air compressor 21.

[0081] The first inverter 22 and the second inverter 23 convert the DC power supplied from the fuel cell 11 and the battery 13 into three-phase AC power, and the first inverter 22 supplies the converted power to the motor 14 , and the second inverter 23 supplies the converted power to the air compressor 21 .

[0082] The fuel cell auxiliary machine 17 includes a hydrogen pump, a coolant pump, and a coolant heater, wherein the fuel cell auxiliary machine 17 such as the hydrogen pump, the fuel cell coolant pump, and the fuel cell coolant heater are connected to the output end of the buck converter 16, but the air compressor 21 is connected to the output end of the fuel cell converter 12 and the output end of the boost converter 15 through the second inverter 23. The second inverter 23 converts direct current into alternating current for use by the air compressor 21. The air compressor 21 pumps the oxidant gas to the fuel cell 11.

[0083] The vehicle auxiliary machine 18 includes an air conditioning compressor, an air conditioning coolant heater, an air conditioning coolant pump, a low-voltage buck converter (DCDC) 20, and a battery temperature control box 19, wherein the vehicle auxiliary machine 18 such as the air conditioning compressor, the air conditioning coolant heater, the low-voltage buck converter 20, etc. are connected to the output end of the buck converter 16, but the battery temperature control box 19 is connected to the output end of the fuel cell converter 12 and the output end of the boost converter 19. The battery temperature control box 19 is used to keep the temperature of the battery 13 within the optimal operating range. Among them, the low-voltage buck converter 20 is connected to the low-voltage battery, and the low-voltage battery provides power for the low-voltage components, including but not limited to ECU, low-pressure liquid pump, lights and instruments.

[0084] The fuel cell converter 12 increases the output voltage of the fuel cell 11 according to a command from the PCU (power control unit), and the increased voltage is supplied to the first inverter 22 and the second inverter 23. The fuel cell converter 12 adjusts the output power of the fuel cell 11 by adjusting the current passing through the fuel cell converter 12. Figure 1 As shown, the step-down converter 16 , the first inverter 22 , and the second inverter 23 together with the low-voltage step-down converter 20 constitute a PCU.

[0085] In the embodiment of the present invention, the boost converter 15 is used to increase the voltage output by the battery 13 from the first voltage to the second voltage, and the buck converter 16 is used to reduce the voltage output by the boost converter 15 from the second voltage to the third voltage, so the voltage output by the battery 13 has only undergone one boost and one buck. Compared with the two-stage boost method in the prior art, the embodiment of the present invention can reduce energy loss, and the three levels of voltage, namely, the output voltage (high voltage VH) of the fuel cell converter 12, the output voltage (low voltage VB) of the battery 13, and the input voltage (medium voltage VL) of each auxiliary machine, can coexist, thereby maximizing the performance of each device and allowing each device to operate normally.

[0086] The power source (i.e., fuel cell 11) of the fuel cell vehicle system is a polymer electrolyte fuel cell, which generates electricity by receiving a supply of fuel gas and oxidant gas. Instead of being a polymer electrolyte fuel cell, the fuel cell 11 may be another type of fuel cell, such as a solid oxide fuel cell. The fuel cell 11 has a stacked structure in which a plurality of single cells are stacked.

[0087] The battery 13 is used as a power source of the fuel cell vehicle system together with the fuel cell 11, and supplies power to the load. In an embodiment of the present invention, the battery 13 is a rechargeable and dischargeable lithium-ion battery. Instead of being a lithium-ion battery, the battery 13 can be any other type of secondary battery, such as a nickel-metal hydride battery.

[0088] Optionally, the third voltage is higher than the first voltage, that is, the output voltage of the battery 13 is converted into a high voltage (i.e., the second voltage) by the boost converter 15 and the buck converter 16 to be input into the motor 14, and the high voltage is also converted into a medium voltage (i.e., the third voltage) to be input into each fuel cell auxiliary machine 17 and the vehicle auxiliary machine 18, so that the performance of each device can be maximized so that each device can operate normally. For example, the low voltage can be 200-220V, the medium voltage can be 300-400V, and the high voltage can be 600-750V, and the embodiment of the present invention is not limited to this.

[0089] Figure 2FIG. 1 is a flow chart of a method for troubleshooting a fuel cell vehicle system according to an embodiment of the present invention. Figure 2 As shown, the fault handling method of the fuel cell vehicle system includes the following steps:

[0090] In step S201 , in response to detection of a failure in the battery 13 , the fuel cell converter 12 , the boost converter 15 , and the vehicle auxiliary machines 18 except the low voltage buck converter 20 and the battery temperature control box 19 are controlled to stop operating.

[0091] like Figure 1 As shown, if a fault is detected in the battery 13, the fuel cell converter 12 is controlled to stop running, the boost converter 15 is controlled to stop running, and the vehicle auxiliary equipment 18 such as the air-conditioning compressor, air-conditioning coolant heater, and air-conditioning coolant pump are controlled to stop running, but the low-voltage buck converter 20 and the battery temperature control box 19 are not controlled to stop running, and the low-voltage buck converter 20 and the battery temperature control box 19 are still in operation.

[0092] It should be noted that the fuel cell converter 12, boost converter 15, vehicle auxiliary equipment 18 except the low-voltage buck converter 20 and the battery temperature control box 19 and other components can be controlled to stop at the same time, or they can be stopped one by one in a preset order, and the embodiment of the present invention does not limit this.

[0093] Step S202 , controlling the fuel cell 11 to continue to operate so that the fuel cell 11 directly supplies power to the load.

[0094] After the fuel cell converter 12, the boost converter 15, and the vehicle auxiliary machines 18 except the low voltage step-down converter 20 and the battery temperature control box 19 are stopped, the fuel cell 11 is forcibly controlled to continue operating, so that the fuel cell 11 directly supplies power to the load.

[0095] Step S203, controlling the first inverter 22, the second inverter 23, the buck converter 16, the fuel cell auxiliary machine 17, the low voltage buck converter 20, and the battery temperature control box 19 to stop running.

[0096] Since the fuel cell 11 is forced to continue running, the first inverter 22, the second inverter 23, the buck converter 16, the fuel cell auxiliary machine 17, the low-voltage buck converter 20, and the battery temperature control box 19 are controlled to stop running in step S203, so that the connection time of these components can be extended as long as possible.

[0097] Since the low-voltage buck converter 20 is connected to the low-voltage battery, if the low-voltage buck converter 20 stops running for a long time, the low-voltage battery will be depleted, which will lead to control confusion caused by insufficient power supply to the vehicle ECU. Therefore, the embodiment of the present invention extends the connection time of the low-voltage buck converter 20 as long as possible. In order to ensure that the fuel cell 11 continues to supply power without affecting the driving of the vehicle, the embodiment of the present invention controls the first inverter 22, the second inverter 23, the buck converter 16, and the fuel cell auxiliary machine 17 to stop running in step S203. Since the relay 24 of the battery 13 has not been cut off at this time, the battery temperature control box 19 is controlled to stop running in step S203.

[0098] Step S204, disconnecting the relay 24 of the battery 13.

[0099] like Figure 1 As shown, the relay 24 of the battery 13 is disconnected, and the battery 13 is no longer used as a power source, and the fuel cell 11 is used as the only power source.

[0100] Step S205 , controlling the boost converter 15 , the buck converter 16 , the fuel cell auxiliary machine 17 , the vehicle auxiliary machine 18 , the first inverter 22 , and the second inverter 23 to restart so that the vehicle enters the limp home mode.

[0101] After the relay 24 of the battery 13 is cut off, the buck converter 16, the fuel cell auxiliary machine 17, the vehicle auxiliary machine 18 (such as the air-conditioning compressor, the air-conditioning coolant heater, the air-conditioning coolant pump, the low-voltage buck converter 20, the battery temperature control box 19, etc.), the first inverter 22, and the second inverter 23 are controlled to start again to put the vehicle into limp mode.

[0102] Starting the battery temperature control box 19 in step S204 helps to accelerate the consumption of the electric energy stored in the capacitor of the boost converter 15, so that the electric energy stored in the capacitor of the boost converter 15 is consumed by the battery temperature control box 19 and other loads in a shorter time.

[0103] Optionally, after the battery temperature control box 19 is started, the battery temperature before the failure of the battery 13 is first obtained, and then the battery temperature control box 19 is determined to heat or cool the battery 13 according to the battery temperature. For example, if the battery temperature before the failure of the battery 13 is lower than the first temperature threshold, the battery temperature control box 19 heats the battery 13 at full power; if the battery temperature before the failure of the battery 13 is higher than the second temperature threshold, the battery temperature control box 19 cools the battery 13 at full power.

[0104] After the vehicle enters the limp home mode, the fuel cell converter 12 no longer has a voltage boost requirement, and the fuel cell converter 12 cannot independently control the boosted voltage, so some performance of the load components (in a lower voltage operating range) is sacrificed to simplify the vehicle's control logic. This does not require a large number of software and hardware changes, so the fuel cell converter 12 does not need to be restarted again.

[0105] When the battery 13 is abnormal, the relay 24 is disconnected, so that only the fuel cell 11 outputs the high voltage of 300 V.

[0106] Step S206, detecting whether the relay 24 is sintered.

[0107] After the vehicle enters the limp home mode, the vehicle has basic driving functions, which can ensure that the vehicle's driving is not affected when a local component of the vehicle system fails. After the vehicle enters the limp home mode, it detects whether the relay 24 is sintered, so as to respond to the user's driving needs as soon as possible.

[0108] Optionally, step S206 may include: determining whether the input current of the boost converter 15 is less than or equal to the current threshold, and whether the input voltage (BVL) of the boost converter 15 is less than or equal to the voltage threshold; in response to the input current of the boost converter 15 being less than or equal to the current threshold and the input voltage of the boost converter 15 being less than or equal to the voltage threshold, controlling the boost converter 15 and the battery temperature control box 19 to stop running, and continuing to control the vehicle in limp mode; in response to the input current of the boost converter 15 being greater than the current threshold or the input voltage of the boost converter 15 being greater than the voltage threshold, turning off the power supply of the vehicle. After the vehicle enters the limp mode, a current sensor (the boost converter 15 itself includes a current sensor) is used to detect the input current of the boost converter 15, and it is determined whether the input current of the boost converter 15 is less than or equal to the current threshold, and a current sensor is used to detect the input voltage of the boost converter 15, and it is determined whether the input voltage of the boost converter 15 is less than or equal to the voltage threshold. Among them, the current threshold is set to be close to zero, and the voltage threshold is set to be close to zero. If the input current of the boost converter 15 is less than or equal to the current threshold and the input voltage of the boost converter 15 is less than or equal to the voltage threshold, the vehicle is controlled to continue in the limp home mode. Otherwise, the power supply of the vehicle is turned off, that is, the vehicle is powered off.

[0109] It should be noted that only when the input current of the boost converter 15 is close to zero and the input voltage of the boost converter 15 is also close to zero, can it be determined that the relay 24 is not sintered. On the contrary, even if the input current of the boost converter 15 is close to zero or the input voltage of the boost converter 15 is close to zero, the relay 24 may also be sintered.

[0110] Therefore, after detecting a battery failure, the embodiment of the present invention controls the vehicle to enter the limp mode, and detects whether the relay is sintered after the vehicle enters the limp mode, without the need to control the power system to stop to detect the relay. Therefore, the user's driving needs can be responded to as quickly as possible, thereby improving the user experience and avoiding danger.

[0111] Figure 3 FIG. 1 is a flowchart of a method for troubleshooting a fuel cell vehicle system according to a second embodiment of the present invention. Figure 3 As shown, the fault handling method of the fuel cell vehicle system may include:

[0112] Step S301 , detecting whether the battery 13 fails; if so, executing step S302 ; if not, executing step S310 .

[0113] In step S302, the fuel cell converter 12, the boost converter 15, and the vehicle auxiliary machines 18 except the low voltage buck converter 20 and the battery temperature control box 19 are controlled to stop operating.

[0114] Step S303 , controlling the fuel cell 11 to continue to operate, so that the fuel cell 11 directly supplies power to the load.

[0115] Step S304, controlling the first inverter 22, the second inverter 23, the buck converter 16, the fuel cell auxiliary machine 17, the low voltage buck converter 20, and the battery temperature control box 19 to stop running.

[0116] Step S305 , disconnecting the relay 24 of the battery 13 .

[0117] Step S306, controls the boost converter 15, the buck converter 16, the fuel cell auxiliary machine 17, the vehicle auxiliary machine 18 (including the air-conditioning compressor, the air-conditioning coolant heater, the air-conditioning coolant pump, the low-voltage buck converter 20, the battery temperature control box 19, etc.), the first inverter 22, and the second inverter 23 to start again to put the vehicle into limp mode.

[0118] Step S307 , determining whether the input current of the boost converter 15 is less than or equal to the current threshold and whether the input voltage of the boost converter 15 is less than or equal to the voltage threshold; if so, executing step 308 ; if not, executing step 311 .

[0119] Step S308, controlling the boost converter 15 and the battery temperature control box 19 to stop running.

[0120] Step S309 , determining whether a power off instruction submitted by the user is received, or detecting whether other components except the battery 13 fail; if so, executing step S311 ; if not, executing step 307 .

[0121] Step S310, controlling the vehicle to maintain a normal driving state.

[0122] Step S311, turn off the power of the vehicle.

[0123] It should be noted that during the execution of step S307 and step S309, the vehicle is always in limp mode. In addition, step S307 may be executed at regular intervals according to a preset rule. When step S307 is executed again, if the boost converter 15 and the battery temperature control box 19 have been controlled to stop running, step S309 or step S311 is directly executed.

[0124] The embodiment of the present invention controls the vehicle to enter the limp home mode after detecting a battery failure, so that it is possible to detect whether the relay 24 of the battery 13 is sintered during vehicle driving, thereby responding to the user's driving needs as soon as possible.

[0125] Figure 4 Schematic diagram of a fault handling device for a fuel cell vehicle system according to an embodiment of the present invention. Figure 4 As shown, the fault handling device of the fuel cell vehicle system includes a first control unit 401 and a second control unit 402; wherein the first control unit 401 is used to control the fuel cell converter, the boost converter, and the vehicle auxiliary machines except the low-voltage buck converter and the battery temperature control box to stop running in response to detecting a battery fault; control the fuel cell to continue running so that the fuel cell directly supplies power to the load; control the first inverter, the second inverter, the buck converter, the fuel cell auxiliary machine, the low-voltage buck converter, and the battery temperature control box to stop running; cut off the battery relay; control the boost converter, the buck converter, the fuel cell auxiliary machine, the vehicle auxiliary machine, the first inverter, and the second inverter to start again so that the vehicle enters the limp mode; the second control unit 402 is used to detect whether the relay is sintered.

[0126] Optionally, the second control unit 402 is further configured to:

[0127] Determining whether an input current of the boost converter is less than or equal to a current threshold, and whether an input voltage of the boost converter is less than or equal to a voltage threshold;

[0128] In response to an input current of the boost converter being less than or equal to a current threshold and an input voltage of the boost converter being less than or equal to a voltage threshold, controlling the boost converter and the battery temperature control box to stop operating, and continuing to control the vehicle to be in a limp home mode;

[0129] In response to an input current of the boost converter being greater than a current threshold or an input voltage of the boost converter being greater than a voltage threshold, power to the vehicle is shut down.

[0130] Optionally, the second control unit 402 is further configured to:

[0131] After the vehicle enters the limp home mode, in response to receiving a power off command submitted by a user, the power of the vehicle is turned off.

[0132] Optionally, the second control unit 402 is further configured to:

[0133] After the vehicle enters the limp home mode, in response to detecting a failure of a component other than the battery, power to the vehicle is shut down.

[0134] Optionally, the fuel cell vehicle system comprises:

[0135] A fuel cell for supplying power to the load; wherein the load includes an electric motor, an air compressor and an auxiliary machine, and the auxiliary machine includes a vehicle auxiliary machine and a fuel cell auxiliary machine;

[0136] a fuel cell converter connected between the fuel cell and the load, for increasing the voltage output from the fuel cell;

[0137] A battery for supplying electric power to the load;

[0138] a boost converter connected between the battery and the motor and configured to boost the voltage output from the battery;

[0139] a buck converter connected between the boost converter and the auxiliary machine and configured to reduce a voltage output from the boost converter and a voltage output from the fuel cell converter;

[0140] a first inverter connected between the fuel cell converter and the motor, and connected between the boost converter and the motor;

[0141] a second inverter connected in parallel with the first inverter and connected to the air compressor;

[0142] Among them, the vehicle auxiliary machine includes a low-voltage buck converter and a battery temperature control box, the low-voltage buck converter is connected to the output end of the buck converter, and the battery temperature control box is connected to the output end of the fuel cell converter and the output end of the boost converter.

[0143] Optionally, the boost converter is used to increase the voltage output by the battery from a first voltage to a second voltage, and the buck converter is used to reduce the voltage output by the boost converter from the second voltage to a third voltage, wherein the third voltage is higher than the first voltage.

[0144] It should be noted that the specific implementation content of the fault handling device of the fuel cell vehicle system of the present invention has been described in detail in the fault handling method of the fuel cell vehicle system described above, so the repeated content will not be described here.

[0145] As another aspect, the present invention further provides a vehicle, which includes a fuel cell vehicle system and the fault handling device for the fuel cell vehicle system described in the above embodiment.

[0146] The flow chart and block diagram in the figure illustrate the possible implementation architecture, function and operation of the system, method and computer program according to various embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a module, program segment or part of the code, and the above-mentioned module, program segment or part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flow chart, and the combination of the boxes in the block diagram or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0147] The units involved in the embodiments of the present invention may be implemented by software or hardware. The units described may also be arranged in a processor, for example, it may be described as follows: a processor includes a first control unit and a second control unit, wherein the names of these units do not constitute limitations on the units themselves in some cases.

[0148] As another aspect, an embodiment of the present invention further provides an electronic device, comprising: one or more processors; a storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the following method: in response to detecting a battery failure, controlling the fuel cell converter, the boost converter, and the vehicle auxiliary machines except the low-voltage buck converter and the battery temperature control box to stop running; controlling the fuel cell to continue running so that the fuel cell directly supplies power to the load; controlling the first inverter, the second inverter, the buck converter, the fuel cell auxiliary machine, the low-voltage buck converter, and the battery temperature control box to stop running; cutting off the battery relay; controlling the boost converter, the buck converter, the fuel cell auxiliary machine, the vehicle auxiliary machine, the first inverter, and the second inverter to start again so that the vehicle enters limp mode; detecting whether the relay is sintered.

[0149] As another aspect, the present invention also provides a computer-readable medium, which may be included in the device described in the above embodiment; or it may exist independently without being assembled into the device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by a device, the device implements the following method: in response to detecting a battery failure, control the fuel cell converter, the boost converter, and the vehicle auxiliary machines except the low-voltage buck converter and the battery temperature control box to stop running; control the fuel cell to continue running so that the fuel cell directly supplies power to the load; control the first inverter, the second inverter, the buck converter, the fuel cell auxiliary machine, the low-voltage buck converter, and the battery temperature control box to stop running; cut off the battery relay; control the boost converter, the buck converter, the fuel cell auxiliary machine, the vehicle auxiliary machine, the first inverter, and the second inverter to start again so that the vehicle enters the limp mode; detect whether the relay is sintered. The computer-readable medium may include ROM, RAM, magnetic disk, optical disk, or USB flash drive, etc.

[0150] The fault handling method of the fuel cell vehicle system provided in the embodiment of the present invention controls the vehicle to enter the limp home mode when a battery fault is detected, and detects whether the relay is sintered after the vehicle enters the limp home mode, without the need to control the power system to stop in order to detect the relay, thereby being able to respond to the user's driving needs as quickly as possible.

[0151] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for troubleshooting a fuel cell vehicle system, characterized in that: The following steps are involved: In response to detecting a battery failure, controlling a fuel cell converter, a boost converter, and vehicle auxiliary machines other than a low-voltage buck converter and a battery temperature control box to stop operating; Controlling the fuel cell to continue to operate so that the fuel cell directly supplies electricity to the load; Control the first inverter, the second inverter, the buck converter, the fuel cell auxiliary machine, the low-voltage buck converter, and the battery temperature control box to stop running; Cut off the battery relay; Controlling the boost converter, the buck converter, the fuel cell auxiliary machine, the vehicle auxiliary machine, the first inverter, and the second inverter to restart so that the vehicle enters a limp home mode; Detect whether the relay is sintered.

2. The method for troubleshooting a fuel cell vehicle system according to claim 1, characterized in that: Detecting whether the relay is sintered includes: Determining whether an input current of the boost converter is less than or equal to a current threshold, and whether an input voltage of the boost converter is less than or equal to a voltage threshold; In response to an input current of the boost converter being less than or equal to a current threshold and an input voltage of the boost converter being less than or equal to a voltage threshold, controlling the boost converter and the battery temperature control box to stop operating, and continuing to control the vehicle to be in a limp home mode; In response to an input current of the boost converter being greater than a current threshold or an input voltage of the boost converter being greater than a voltage threshold, power to the vehicle is shut down.

3. The method for troubleshooting a fuel cell vehicle system according to claim 1 or 2, characterized in that: After the vehicle enters limp home mode, it also includes: In response to receiving a power-off instruction submitted by a user, power of the vehicle is turned off.

4. The method for troubleshooting a fuel cell vehicle system according to claim 1 or 2, characterized in that: After the vehicle enters limp home mode, it also includes: In response to detecting a failure of a component other than the battery, power to the vehicle is shut down.

5. The method for troubleshooting a fuel cell vehicle system according to claim 1, characterized in that: The fuel cell vehicle system comprises: A fuel cell for supplying power to the load; wherein the load includes an electric motor, an air compressor and an auxiliary machine, and the auxiliary machine includes a vehicle auxiliary machine and a fuel cell auxiliary machine; a fuel cell converter connected between the fuel cell and the load, for increasing the voltage output from the fuel cell; A battery for supplying electric power to the load; a boost converter, connected between the battery and the load, for boosting the voltage output from the battery; a buck converter connected between the boost converter and the auxiliary machine and configured to reduce a voltage output from the boost converter and a voltage output from the fuel cell converter; a first inverter connected between the fuel cell converter and the motor, and connected between the boost converter and the motor; a second inverter connected in parallel with the first inverter and connected to the air compressor; Among them, the vehicle auxiliary machine includes a low-voltage buck converter and a battery temperature control box, the low-voltage buck converter is connected to the output end of the buck converter, and the battery temperature control box is connected to the output end of the fuel cell converter and the output end of the boost converter.

6. The method for troubleshooting a fuel cell vehicle system according to claim 5, characterized in that: The boost converter is used to increase the voltage output by the battery from a first voltage to a second voltage, and the buck converter is used to reduce the voltage output by the boost converter from the second voltage to a third voltage, wherein the third voltage is higher than the first voltage.

7. A fault handling device for a fuel cell vehicle system, characterized in that: include: a first control unit, for controlling the fuel cell converter, the boost converter, and the vehicle auxiliary machines except the low-voltage buck converter and the battery temperature control box to stop running in response to detecting a battery failure; controlling the fuel cell to continue running so that the fuel cell directly supplies power to the load; controlling the first inverter, the second inverter, the buck converter, the fuel cell auxiliary machine, the low-voltage buck converter, and the battery temperature control box to stop running; disconnecting the battery relay; controlling the boost converter, the buck converter, the fuel cell auxiliary machine, the vehicle auxiliary machine, the first inverter, and the second inverter to start again so that the vehicle enters a limp home mode; The second control unit is used to detect whether the relay is sintered.

8. A vehicle, characterized in that: The invention comprises a fuel cell vehicle system and a fault handling device for the fuel cell vehicle system as claimed in claim 7.

9. An electronic device, characterized in that: include: one or more processors; a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the fault handling method of the fuel cell vehicle system as described in any one of claims 1-6.

10. A computer readable medium having a computer program stored thereon, characterized in that: When the program is executed by the processor, the fault handling method of the fuel cell vehicle system as described in any one of claims 1 to 6 is implemented.

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