Vehicle safety control method and system and vehicle

Abstract

The invention relates to the technical field of fuel cells, in particular to a safety control method and system of a vehicle and the vehicle. When the first insulation state information and / or the second insulation state information are / is abnormal, a first operation instruction of a user is obtained, when the first operation instruction indicates removal of a fault, a conduction control valve between a fuel cell cooling system and a power cell cooling system is controlled to be opened, and whether the abnormity of the second insulation state information is removed or not is detected; in the application, through interaction of the cooling liquid between the fuel cell and the power cell, the insulation fault of the power cell is removed, so that the power cell is recovered to a normal state, the interaction conductivity control between the fuel cell and the power cell is realized, and the purposes of early prevention of fault occurrence, delay of fault occurrence and reduction of equipment damage are realized; therefore, the safety and the reliability of the vehicle are improved.

Description

Technical Field

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

[0002] In the power system of fuel cell vehicles, the hybrid system of fuel cell plus lithium-ion battery is widely used. However, for these two batteries, the control of coolant conductivity is crucial. If the battery coolant conductivity is too high, it may cause serious safety problems such as short circuit and electric shock to users. However, current research mainly focuses on the control of coolant conductivity and insulation fault handling of a single battery, while ignoring the handling of insulation faults in hybrid mode. As a result, when the vehicle is in hybrid mode, insulation faults cannot be effectively prevented, causing safety problems. Therefore, how to safely control the vehicle when insulation faults occur in hybrid mode has become an urgent problem to be solved. Summary of the invention Based on this, it is necessary to provide a vehicle safety control method, system and vehicle to address the above technical issues, so as to solve the safety problems caused by insulation failure in hybrid mode.

[0003] A first aspect of an embodiment of the present application provides a vehicle safety control method, including: collecting first insulation state information of a fuel cell cooling system and second insulation state information of a power battery cooling system in real time, and obtaining a first operation instruction of a user when an abnormality occurs in the first insulation state information and / or the second insulation state information; When the first operation instruction indicates to remove the fault, controlling to open the conduction control valve between the fuel cell cooling system and the power battery cooling system, and detecting whether the abnormality in the second insulation state information is removed; If it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to restrict driving; if it is detected that the abnormality of the second insulation state information has been resolved, the vehicle is controlled to drive according to the second insulation state information collected in real time.

[0004] A second aspect of an embodiment of the present application provides a vehicle insulation failure safety control system, characterized in that it includes: a fuel cell cooling system, a power battery cooling system, a conduction valve and a controller, the fuel cell cooling system is connected to the power battery cooling system via the conduction valve, the controller connects the fuel cell cooling system, the power battery cooling system and the conduction valve, and the controller is used to execute the vehicle safety control method described in any one of the first aspects.

[0005] A third aspect of an embodiment of the present application provides a vehicle, comprising a vehicle safety control system.

[0006] Compared with the prior art, the present invention has the following beneficial effects: The first insulation state information of the fuel cell cooling system and the second insulation state information of the power battery cooling system are collected in real time. When the first insulation state information and / or the second insulation state information are abnormal, the user's first operation instruction is obtained. When the first operation instruction indicates to remove the fault, the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to open, and the abnormality of the second insulation state information is detected to be removed. If it is detected that the abnormality of the second insulation state information is not removed, the vehicle is controlled to be restricted from driving. If it is detected that the abnormality of the second insulation state information is removed, the vehicle is controlled to drive according to the second insulation state information collected in real time. In the present application, the insulation fault of the power battery is removed by the interaction of the coolant between the fuel cell and the power battery, so that the power battery is restored to a normal state, and the interactive conductivity control between the fuel cell and the power battery is realized, so as to achieve the purpose of preventing the occurrence of faults in advance, delaying the occurrence of faults, and reducing equipment damage, thereby improving the safety and reliability of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0008] Figure 1 is a flow chart of a vehicle safety control method provided in Embodiment 1 of the present invention; Figure 2 is a flow chart of a vehicle safety control method provided by Embodiment 2 of the present invention; Figure 3 is a flow chart of a vehicle safety control method provided by Embodiment 3 of the present invention; Figure 4 is a flow chart of a vehicle safety control method provided by a fourth embodiment of the present invention; Figure 5 is a flow chart of a vehicle safety control method provided in Embodiment 5 of the present invention; Figure 6 is a flow chart of a vehicle safety control method provided by Embodiment 6 of the present invention; Figure 7 is a flow chart of a vehicle safety control method provided by Embodiment 7 of the present invention; Figure 8 is a schematic structural diagram of a vehicle safety control system provided by Embodiment 9 of the present invention; Fig. 9 It is a schematic diagram of a vehicle provided in Embodiment 10 of the present invention. DETAILED DESCRIPTION

[0009] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are 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 are within the scope of protection of the present invention.

[0010] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0011] It should also be understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0012] As used in the present specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]", depending on the context.

[0013] In addition, in the description of the present specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0014] References to "one embodiment" or "some embodiments" etc. described in the present specification mean that one or more embodiments of the present invention include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0015] It should be understood that the order of execution of the steps in the following embodiments does not imply a precedence of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0016] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for illustration.

[0017] See also Figure 1 , is a flow chart of a vehicle safety control method provided by Embodiment 1 of the present invention, such as Figure 1 As shown, the vehicle safety control method may include the following steps.

[0018] S101: collecting first insulation state information of a fuel cell cooling system and second insulation state information of a power battery cooling system in real time, and obtaining a first operation instruction of a user when an abnormality occurs in the first insulation state information and / or the second insulation state information.

[0019] In step S101, first insulation status information of a fuel cell cooling system and second insulation status information of a power battery cooling system in a vehicle are collected in real time, wherein the first insulation status information includes the insulation resistance of a fuel cell in the fuel cell cooling system, and the second insulation status information includes the insulation resistance of the power battery. Based on the first insulation status information and the second insulation status information, when an abnormality occurs in the first insulation status information and / or the second insulation status information, a first operation instruction of the user is obtained, wherein the first operation instruction is an operation instruction indicating whether to relieve the insulation fault of the power battery.

[0020] In this embodiment, first insulation status information of the fuel cell cooling system and second insulation status information of the power battery cooling system in the vehicle are collected in real time to determine whether there is an abnormality in the first insulation status information and the second insulation status information, that is, whether there is an abnormality in the insulation resistance values ​​in the fuel cell cooling system and the power battery cooling system.

[0021] It should be noted that when the first insulation state information of the fuel cell cooling system and the second insulation state information of the power battery cooling system in the vehicle are collected in real time, the collection is performed by receiving the first insulation state information and the second insulation state information sent by the fuel cell cooling system and the power battery cooling system.

[0022] It should be noted that the abnormality in the first insulation state information may be that the insulation resistance of the fuel cell cooling system is less than a certain threshold value, and the abnormality in the second insulation state information may be that the insulation resistance of the power battery cooling system is less than a certain threshold value.

[0023] When the first insulation state information and / or the second insulation state information is abnormal, a first operation instruction of the user is obtained, wherein the first operation instruction is an operation instruction indicating whether to remove the power battery insulation fault.

[0024] S102: When the first operation instruction indicates to clear the fault, control to open the conduction control valve between the fuel cell cooling system and the power battery cooling system to detect whether the abnormality in the second insulation state information is cleared.

[0025] In step S102, the first operation instruction is to indicate fault removal, that is, to control the vehicle to remove the power battery insulation fault. When the first operation instruction is to indicate fault removal, the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to open, so that the coolant in the fuel cell cooling system flows to the power battery cooling system, thereby increasing the insulation resistance of the coolant in the power battery cooling system to achieve the purpose of removing the insulation fault.

[0026] In this embodiment, the fuel cell cooling system and the power battery cooling system are connected via a conduction valve. When the first operating instruction indicates to clear the fault, the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to open, so that the coolant of the fuel cell cooling system flows to the power battery cooling system. The coolant of the fuel cell cooling system dilutes the coolant in the power battery cooling system, reduces the conductivity of the coolant in the power battery cooling system, and achieves the purpose of clearing the insulation fault.

[0027] After the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to be opened, it is detected whether the abnormality of the second insulation state information is resolved. When detecting whether the abnormality of the second insulation state information is resolved, the insulation resistance value in the second insulation state information can be detected. For example, when the insulation resistance value of the second insulation state information is greater than a certain threshold value, it is considered that the abnormality of the second insulation state information is resolved. Otherwise, it is considered that the abnormality of the second insulation state information is not resolved.

[0028] S103: If it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to be restricted from traveling; if it is detected that the abnormality of the second insulation state information has been resolved, the vehicle is controlled to travel according to the second insulation state information collected in real time.

[0029] In step S103, if it is detected that the abnormality of the second insulation state information has not been resolved, that is, the insulation resistance in the second insulation state information has not met the requirement, that is, the insulation resistance in the second insulation state information is less than a certain threshold. If the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to be restricted from driving. If it is detected that the abnormality of the second insulation state information has been resolved, that is, the insulation resistance in the second insulation state information has also met the requirement. After the abnormality is resolved, the vehicle is controlled to drive according to the first insulation state information and the second insulation state information collected in real time.

[0030] In this embodiment, if it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to limit its driving, that is, the vehicle's running speed and power are limited, and the vehicle's speed and power are limited to a certain range, so that the vehicle can be in a safe state when driving according to the corresponding speed and power.

[0031] If it is detected that the abnormality in the second insulation status information is resolved, the second insulation status information of the power battery cooling system is collected in real time, and the vehicle driving is controlled according to the second insulation status information collected in real time, that is, different control strategies are used to control the vehicle driving according to whether there is an abnormality in the first insulation status information and the second insulation status information collected in real time.

[0032] See also Figure 2 , is a flow chart of a vehicle safety control method provided by Embodiment 2 of the present invention, such as Figure 2 As shown, after collecting the first insulation state information of the fuel cell cooling system and the second insulation state information of the power battery cooling system in real time, it also includes: S201: when the abnormality in the first insulation state information is a fuel cell insulation fault and the abnormality in the second insulation state information is a power battery insulation fault warning, judging the difference between the first insulation resistance value of the fuel cell in the fuel cell cooling system and the preset first threshold value according to the first insulation state information; S202: When the first insulation resistance is greater than a preset first threshold, control the conduction control valve between the fuel cell cooling system and the power battery cooling system to open, and detect whether the abnormality in the second insulation state information is resolved; S203: If it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to be restricted from traveling; if it is detected that the abnormality of the second insulation state information has been resolved, the vehicle is controlled to travel according to the second insulation state information collected in real time.

[0033] In this embodiment, after collecting the first insulation status information of the fuel cell cooling system and the second insulation status information of the power battery cooling system in real time, it is judged whether there is an abnormality in the first insulation status information and the second insulation status information according to the corresponding first insulation status information and the second insulation status information. When judging, the judgment is made according to the insulation resistance value of the fuel cell in the first insulation status information and the insulation resistance value of the power battery in the second insulation status information.

[0034] For example, when the insulation resistance of the fuel cell in the first insulation state information is less than the first preset resistance and greater than the second preset resistance, it is considered that the fuel cell cooling system has a fuel cell insulation fault warning, when the insulation resistance of the power battery in the second insulation state information is less than the third preset resistance and greater than the fourth preset resistance, it is considered that the power battery cooling system has a power battery insulation fault warning, when the insulation resistance of the fuel cell in the first insulation state information is not greater than the second preset resistance, it is considered that the fuel cell cooling system has a fuel cell insulation fault, when the insulation resistance of the power battery in the second insulation state information is not greater than the fourth preset resistance, it is considered that the power battery cooling system has a power battery insulation fault. Wherein, the first preset resistance is greater than the second preset resistance, and the third preset resistance is greater than the fourth preset resistance.

[0035] It should be noted that, in this embodiment, the early warning of insulation fault includes no insulation fault early warning, fuel cell insulation fault early warning, power battery insulation fault early warning, and dual battery insulation fault. Among them, if the insulation resistance of the fuel cell in the first insulation state information is not less than the first preset resistance, and the insulation resistance of the power battery in the second insulation state information is not less than the third preset resistance, it is determined to be no insulation fault early warning. If the insulation resistance of the fuel cell in the first insulation state information is less than the first preset resistance and greater than the second preset resistance, it is determined to be a fuel cell insulation fault early warning. If the insulation resistance of the power battery in the second insulation state information is less than the third preset resistance and greater than the fourth preset resistance, it is determined to be a power battery insulation fault early warning. If the insulation resistance of the fuel cell in the first insulation state information is less than the first preset resistance and greater than the second preset resistance, and the insulation resistance of the power battery in the second insulation state information is less than the third preset resistance and greater than the fourth preset resistance, it is determined to be a dual battery insulation fault early warning.

[0036] In the hybrid output mode, if there is no insulation fault warning, that is, the first insulation state information and the second insulation state information are normal, the vehicle is controlled to operate in the hybrid output mode, wherein the hybrid output mode is that the fuel cell and the power battery provide power to the vehicle at the same time.

[0037] In the hybrid power output mode, if a fuel cell insulation fault warning occurs, that is, the insulation resistance of the fuel cell in the first insulation status information is less than the first preset resistance and greater than the second preset resistance, the display shows whether to switch to the pure electric power output mode, where the pure electric power output mode is a mode that uses a power battery to provide power for the vehicle, and the user selects it according to the actual scenario. If the user chooses not to switch to the pure electric power output mode, the vehicle is controlled to limit driving, that is, limit the vehicle's running speed and power, and limit the vehicle's speed and power to a certain range, so that the vehicle can be in a safe state when driving according to the corresponding speed and power.

[0038] The user chooses not to switch to the pure electric power output mode, that is, the vehicle still operates in the hybrid power output mode. If a fuel cell insulation failure occurs, that is, the insulation resistance of the fuel cell is not greater than the second preset resistance, the vehicle is controlled to switch to the pure electric power output mode, that is, the power battery is used to provide power for the vehicle.

[0039] In the pure electric power output mode, if there is a power battery insulation fault warning, that is, the insulation resistance of the power battery is less than the third preset resistance and greater than the fourth preset resistance, the display will show whether to stop for maintenance. The user can choose according to the actual scenario. If the vehicle is stopped for maintenance, the vehicle will be stopped and powered off. If the vehicle is not stopped for maintenance, the vehicle will be controlled to limit driving, that is, the vehicle's running speed and power will be limited to a certain range, so that the vehicle can be in a safe state when driving according to the corresponding speed and power.

[0040] After the vehicle is restricted from driving, the abnormality in the first insulation state information is a fuel cell insulation fault, and the abnormality in the second insulation state information is a power battery insulation fault warning. When the vehicle is driving in the pure electric power output mode, the first insulation resistance of the fuel cell in the fuel cell cooling system and the preset first threshold value are judged according to the first insulation state information, wherein the preset first threshold value is not greater than the second preset resistance value. When the first insulation resistance value is greater than the preset first threshold value, that is, when the insulation resistance value after the fuel cell insulation fault is greater than the preset first threshold value, the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to open, so that the coolant of the fuel cell cooling system flows to the power battery cooling system, and the coolant of the fuel cell cooling system dilutes the coolant in the power battery cooling system, reduces the conductivity of the coolant in the power battery cooling system, and achieves the purpose of eliminating the insulation fault.

[0041] After the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to be opened, the restricted driving of the vehicle is cancelled, and it is detected whether the abnormality of the second insulation state information is resolved. When detecting whether the abnormality of the second insulation state information is resolved, the insulation resistance value in the second insulation state information can be detected. For example, when the insulation resistance value of the second insulation state information is greater than a certain threshold value, it is considered that the abnormality of the second insulation state information is resolved. Otherwise, it is considered that the abnormality of the second insulation state information is not resolved.

[0042] If the abnormality of the second insulation status information is not resolved, in the pure electric power output mode, if a power battery insulation fault warning appears, the display will show whether to stop for maintenance. The user will make a choice based on the actual scenario. If the vehicle is stopped for maintenance, the vehicle will be stopped and powered off. If the vehicle is not stopped for maintenance, the vehicle will be restricted, that is, the vehicle's running speed and power will be limited to a certain range, so that the vehicle can be in a safe state when driving according to the corresponding speed and power. If a power battery insulation fault occurs after the vehicle is restricted, the vehicle will be stopped and powered off. If the vehicle is started again, the shutdown will continue.

[0043] If it is detected that the abnormality of the second insulation state information is resolved, the vehicle is controlled to travel according to the second insulation state information collected in real time.

[0044] See also Figure 3 , is a flow chart of a vehicle safety control method provided by Embodiment 3 of the present invention, such as Figure 3 As shown, after determining the difference between the first insulation resistance of the fuel cell in the fuel cell cooling system and the preset first threshold, the method further includes: S301: When the first insulation resistance is not greater than a preset first threshold, controlling the vehicle to limit driving; S302: When the abnormality in the second insulation state information is a power battery insulation fault, the control executes a step of obtaining a first operation instruction from the user.

[0045] In this embodiment, when the abnormality in the first insulation status information is a fuel cell insulation failure and the abnormality in the second insulation status information is a power battery insulation failure warning, the vehicle travels in a pure electric power output mode, and after judging the difference between the first insulation resistance of the fuel cell in the fuel cell cooling system and the preset first threshold value according to the first insulation status information, when the first insulation resistance value is not greater than the preset first threshold value, that is, the insulation resistance value of the fuel cell is small, the conduction control valve between the fuel cell cooling system and the power battery cooling system cannot be opened, and the vehicle is controlled to limit its driving, that is, limit the vehicle's operating speed and power, and limit the vehicle's speed and power to a certain range, so that the vehicle can be in a safe state when driving according to the corresponding speed and power.

[0046] When the vehicle is driving in the pure electric power output mode, if an abnormality of power battery insulation fault occurs, the user's first operation instruction is obtained. When the first operation instruction indicates to remove the fault, the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to open, and it is detected whether the abnormality of the second insulation state information is removed. If it is detected that the abnormality of the second insulation state information has not been removed, the vehicle is controlled to limit driving. If it is detected that the abnormality of the second insulation state information has been removed, the vehicle is controlled to drive according to the second insulation state information collected in real time.

[0047] See also Figure 4 , is a flow chart of a vehicle safety control method provided by Embodiment 4 of the present invention, such as Figure 4 As shown, after collecting the first insulation state information of the fuel cell cooling system and the second insulation state information of the power battery cooling system in real time, it also includes: S401: when the abnormality in the second insulation state information is a power battery insulation fault warning, obtaining the amount of fuel in the fuel cell cooling system; S402: When the amount of fuel in the fuel cell cooling system is less than a preset threshold, controlling the vehicle to enter the pure electric power output mode, opening the conduction control valve between the fuel cell cooling system and the power battery cooling system, and detecting whether the abnormality in the second insulation state information is resolved; S403: If it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to be restricted from traveling; if it is detected that the abnormality of the second insulation state information has been resolved, the vehicle is controlled to travel according to the second insulation state information collected in real time.

[0048] In this embodiment, the abnormality in the second insulation status information is a warning of power battery insulation failure. When there is no abnormality in the second insulation status information, the amount of fuel in the fuel cell cooling system is obtained. When the amount of fuel in the fuel cell cooling system is less than a preset threshold, that is, the amount of fuel is small and cannot meet the requirement of providing power for the vehicle, the vehicle is controlled to enter the pure electric power output mode. In the pure electric power output mode, the vehicle is controlled to restrict driving, and the conduction control valve between the fuel cell cooling system and the power battery cooling system is opened to allow the coolant of the fuel cell cooling system to flow to the power battery cooling system. The coolant of the fuel cell cooling system dilutes the coolant in the power battery cooling system, reduces the conductivity of the coolant in the power battery cooling system, and ensures that the pure electric power output mode can operate normally.

[0049] After opening the conduction control valve between the fuel cell cooling system and the power battery cooling system, the fuel stack in the fuel cell cooling system is closed, and the restriction on vehicle driving is cancelled, the vehicle's driving speed and power can be restored. In the pure electric power output mode, if a power battery insulation fault warning appears, the display will show an option to stop for repairs. The user can choose according to the actual scenario. If the vehicle stops for repairs, the vehicle will be stopped and powered off. If the vehicle does not stop for repairs, the vehicle will be restricted, that is, the vehicle's running speed and power will be limited to a certain range, so that the vehicle can be in a safe state when driving according to the corresponding speed and power.

[0050] See also Figure 5 , is a flow chart of a vehicle safety control method provided by Embodiment 5 of the present invention, such as Figure 5 As shown, after collecting the first insulation state information of the fuel cell cooling system and the second insulation state information of the power battery cooling system in real time, it also includes: S501: when the abnormality in the first insulation state information is a fuel cell insulation fault warning, and the abnormality in the second insulation state information is a power battery insulation fault warning, obtaining the amount of fuel in the fuel cell cooling system; S502: When the amount of fuel in the fuel cell cooling system is less than a preset threshold, controlling the vehicle to switch into a pure electric power output mode, and controlling the vehicle to limit driving; S503: in the pure electric power output mode, judging, according to the first insulation state information, the magnitude between the first insulation resistance of the fuel cell in the fuel cell cooling system and a preset first threshold value; S504: When the first insulation resistance is greater than a preset first threshold, control the conduction control valve between the fuel cell cooling system and the power battery cooling system to open, and detect whether the abnormality in the second insulation state information is resolved; S505: If it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to be restricted from traveling; if it is detected that the abnormality of the second insulation state information has been resolved, the vehicle is controlled to travel according to the second insulation state information collected in real time.

[0051] In this embodiment, when the abnormality in the first insulation status information is a fuel cell insulation fault warning and the abnormality in the second insulation status information is a power battery insulation fault warning, that is, a dual battery warning, the amount of fuel in the fuel cell cooling system is obtained, and when the amount of fuel in the fuel cell cooling system is less than a preset threshold, the vehicle is controlled to switch to a pure electric power output mode, and the vehicle is controlled to restrict driving.

[0052] In the pure electric power output mode, after the vehicle is controlled to be restricted from running, the first insulation state information is used to determine the difference between the first insulation resistance of the fuel cell in the fuel cell cooling system and the preset first threshold, wherein the preset first threshold is not greater than the second preset resistance. When the first insulation resistance is greater than the preset first threshold, that is, when the insulation resistance after the fuel cell insulation failure is greater than the preset first threshold, the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to be opened, so that the coolant of the fuel cell cooling system flows to the power battery cooling system, and the coolant of the fuel cell cooling system dilutes the coolant in the power battery cooling system, thereby reducing the conductivity of the coolant in the power battery cooling system, and achieving the purpose of eliminating the insulation failure.

[0053] After the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to be opened, the restricted driving of the vehicle is cancelled, and it is detected whether the abnormality of the second insulation state information is resolved. When detecting whether the abnormality of the second insulation state information is resolved, the insulation resistance value in the second insulation state information can be detected. For example, when the insulation resistance value of the second insulation state information is greater than a certain threshold value, it is considered that the abnormality of the second insulation state information is resolved. Otherwise, it is considered that the abnormality of the second insulation state information is not resolved.

[0054] If it is detected that the abnormality of the second insulation status information has not been resolved, in the pure electric power output mode, if a power battery insulation fault warning appears, the display will show whether to stop for maintenance. The user will make a choice based on the actual scenario. If the vehicle is stopped for maintenance, the vehicle will be stopped and powered off. If the vehicle is not stopped for maintenance, the vehicle will be controlled to limit its driving, that is, the vehicle's running speed and power will be limited to a certain range, so that the vehicle can be in a safe state when driving according to the corresponding speed and power. If a power battery insulation fault occurs after the vehicle is controlled to limit its driving, the vehicle will be stopped and powered off. If the vehicle is started again, the parking and power-off will continue. If it is detected that the abnormality of the second insulation status information has been resolved, the vehicle will be controlled to drive according to the second insulation status information collected in real time.

[0055] In the pure electric power output mode, the vehicle is controlled to be restricted in running. After judging the size of the first insulation resistance of the fuel cell in the fuel cell cooling system and the preset first threshold value according to the first insulation state information, when the first insulation resistance value is not greater than the preset first threshold value, that is, the insulation resistance value of the fuel cell is small, the conduction control valve between the fuel cell cooling system and the power battery cooling system cannot be opened, and the vehicle is controlled to be restricted in running, that is, the running speed and power of the vehicle are limited, and the speed and power of the vehicle are limited to a certain range, so that the vehicle can be in a safe state when running according to the corresponding speed and power.

[0056] When the vehicle is driving in the pure electric power output mode, if an abnormality of power battery insulation fault occurs, the user's first operation instruction is obtained. When the first operation instruction indicates to remove the fault, the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to open, and it is detected whether the abnormality of the second insulation state information is removed. If it is detected that the abnormality of the second insulation state information has not been removed, the vehicle is controlled to limit driving. If it is detected that the abnormality of the second insulation state information has been removed, the vehicle is controlled to drive according to the second insulation state information collected in real time.

[0057] Optionally, after collecting the first insulation state information of the fuel cell cooling system and the second insulation state information of the power battery cooling system in real time, the method further includes: When the first insulation state information and the second insulation state information are normal, the vehicle is controlled to travel in a hybrid power output mode.

[0058] In this embodiment, in the hybrid power output mode, if the first insulation state information and the second insulation state information are normal, that is, the fuel cell cooling system and the power battery cooling system are normal, the vehicle is controlled to operate in the hybrid power output mode, wherein the hybrid power output mode is that the fuel cell and the power battery provide power to the vehicle at the same time.

[0059] See also Figure 6 , is a flow chart of a vehicle safety control method provided by Embodiment 6 of the present invention, such as Figure 7 As shown, after collecting the first insulation state information of the fuel cell cooling system and the second insulation state information of the power battery cooling system in real time, it also includes: S601: when the abnormality in the first insulation state information is a fuel cell insulation fault warning, and the abnormality in the second insulation state information is a power battery insulation fault warning, obtaining a second operation instruction of the user; S602: When the second operation instruction is not to switch out of the hybrid power output mode, controlling the vehicle to limit driving; S603: When the abnormality in the second insulation state information is a power battery insulation fault, controlling the vehicle to switch into a fuel cell power output mode and an electric power output mode, and obtaining a first operation instruction from a user; S604: When the first operation instruction indicates to remove the fault, control to open the conduction control valve between the fuel cell cooling system and the power battery cooling system to detect whether the abnormality in the second insulation state information is removed; S605: If it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to be restricted from traveling; if it is detected that the abnormality of the second insulation state information has been resolved, the vehicle is controlled to travel according to the second insulation state information collected in real time.

[0060] In this embodiment, when the abnormality in the first insulation status information is a fuel cell insulation fault warning, and the abnormality in the second insulation status information is a power battery insulation fault warning, that is, a dual-electric warning, a choice of whether to stop the vehicle and power off appears in the display. If the user chooses not to stop the vehicle and power off, that is, the user's second operation instruction is to power off the vehicle without stopping, the vehicle is controlled to limit its driving, that is, the vehicle's operating speed and power are limited to a certain range, so that the vehicle can be in a safe state when driving according to the corresponding speed and power.

[0061] After the vehicle is restricted from driving, the vehicle continues to drive in the hybrid power output mode. When the abnormality in the second insulation state information is a power battery insulation fault, the vehicle is controlled to switch to the fuel cell power output mode. The display shows whether to stop for maintenance. The user makes a choice according to the actual scenario. If the vehicle is stopped for maintenance, the vehicle is stopped and powered off. If the vehicle is not stopped for maintenance, the vehicle is controlled to be restricted from driving. In the fuel cell power output mode, the fuel cell cooling system of the vehicle is tested for insulation faults. If the fuel cell cooling system has a fuel cell insulation fault, the user's first operation instruction is obtained. When the first operation instruction indicates to remove the fault, the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to open, and the abnormality in the second insulation state information is detected to be removed. If it is detected that the abnormality in the second insulation state information is not removed, the vehicle is controlled to be restricted from driving. If it is detected that the abnormality in the second insulation state information is removed, the vehicle is controlled to drive according to the second insulation state information collected in real time.

[0062] It should be noted that when it is detected that the abnormality of the second insulation state information has not been resolved, if the abnormality of the second insulation state information is a power battery insulation failure, the vehicle is stopped and powered off. If the vehicle is started again, the stopping and powering off are continued.

[0063] See also Figure 7 , is a flow chart of a vehicle safety control method provided by Embodiment 7 of the present invention, such as Figure 7 As shown, when the second operation instruction is not to switch out of the hybrid power output mode, after controlling the vehicle to limit running, the method further includes: S701: When the abnormality in the first insulation state information is a fuel cell insulation fault, controlling the vehicle to switch into a pure electric power output mode, and determining, based on the first insulation state information, a difference between a first insulation resistance value of a fuel cell in a fuel cell cooling system and a preset first threshold value; S702: When the first insulation resistance is greater than a preset first threshold, control the opening of a conduction control valve between the fuel cell cooling system and the power battery cooling system to detect whether the abnormality in the second insulation state information is resolved; S703: If it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to be restricted from traveling; if it is detected that the abnormality of the second insulation state information has been resolved, the vehicle is controlled to travel according to the second insulation state information collected in real time.

[0064] In this embodiment, when the second operation instruction is not to switch out of the hybrid power output mode, after the vehicle is controlled to restrict driving, when the abnormality in the first insulation state information is a fuel cell insulation failure, the vehicle is controlled to switch into the pure electric power output mode, and when there is an insulation fault warning in the power battery, the first insulation resistance of the fuel cell in the fuel cell cooling system and the preset first threshold value are judged according to the first insulation state information. When the first insulation resistance value is greater than the preset first threshold value, that is, the insulation resistance value after the fuel cell insulation failure is greater than the preset first threshold value, the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to open, so that the coolant of the fuel cell cooling system flows to the power battery cooling system, and the coolant of the fuel cell cooling system dilutes the coolant in the power battery cooling system, reduces the conductivity of the coolant in the power battery cooling system, and achieves the purpose of eliminating the insulation fault.

[0065] After controlling and opening the conduction control valve between the fuel cell cooling system and the power battery cooling system, the restricted driving of the vehicle is cancelled, and it is detected whether the abnormality of the second insulation state information is lifted, that is, whether the power battery insulation fault warning is lifted. If it is detected that the abnormality of the second insulation state information is not lifted, in the pure electric power output mode, the display will show whether to stop for maintenance. The user selects according to the actual scenario. If the vehicle is stopped for maintenance, the vehicle is stopped and powered off. If it is not stopped for maintenance, the vehicle is controlled to be restricted, that is, the running speed and power of the vehicle are limited, and the speed and power of the vehicle are limited to a certain range, so that the vehicle can be in a safe state when driving according to the corresponding speed and power. If a power battery insulation fault occurs after the vehicle is controlled to be restricted, the vehicle is stopped and powered off. If the vehicle is started again, the parking and power-off will continue. If it is detected that the abnormality of the second insulation state information is lifted, the vehicle is controlled to drive according to the second insulation state information collected in real time.

[0066] After the vehicle is controlled to enter the pure electric power output mode, when the first insulation resistance is not greater than the preset first threshold value, that is, the insulation resistance of the fuel cell is small, the conduction control valve between the fuel cell cooling system and the power battery cooling system cannot be opened, and the vehicle is controlled to limit its driving, that is, to limit the vehicle's running speed and power, and limit the vehicle's speed and power to a certain range, so that the vehicle can be in a safe state when driving according to the corresponding speed and power.

[0067] When the vehicle is driving in the pure electric power output mode, if an abnormality of power battery insulation fault occurs, the user's first operation instruction is obtained. When the first operation instruction indicates to remove the fault, the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to open, and it is detected whether the abnormality of the second insulation state information is removed. If it is detected that the abnormality of the second insulation state information has not been removed, the vehicle is controlled to limit driving. If it is detected that the abnormality of the second insulation state information has been removed, the vehicle is controlled to drive according to the second insulation state information collected in real time.

[0068] It should be noted that when it is detected that the abnormality of the second insulation state information has not been resolved, if the abnormality of the second insulation state information is a power battery insulation failure, the vehicle is stopped and powered off. If the vehicle is started again, the stopping and powering off are continued.

[0069] The first insulation state information of the fuel cell cooling system and the second insulation state information of the power battery cooling system are collected in real time. When the first insulation state information and / or the second insulation state information are abnormal, the user's first operation instruction is obtained. When the first operation instruction indicates to remove the fault, the conduction control valve between the fuel cell cooling system and the power battery cooling system is controlled to open, and the abnormality of the second insulation state information is detected to be removed. If it is detected that the abnormality of the second insulation state information is not removed, the vehicle is controlled to be restricted from driving. If it is detected that the abnormality of the second insulation state information is removed, the vehicle is controlled to drive according to the second insulation state information collected in real time. In the present application, the insulation fault of the power battery is removed by the interaction of the coolant between the fuel cell and the power battery, so that the power battery is restored to a normal state, and the interactive conductivity control between the fuel cell and the power battery is realized, so as to achieve the purpose of preventing the occurrence of faults in advance, delaying the occurrence of faults, and reducing equipment damage, thereby improving the safety and reliability of the vehicle.

[0070] See also Figure 8 , is a schematic diagram of the structure of a vehicle safety control system 80 provided in Embodiment 9 of the present invention, such as Figure 8 As shown, the vehicle safety control system 80 includes a fuel cell cooling system 81, a power battery cooling system 82, a conduction valve 83 and a vehicle controller 84. The fuel cell cooling system 81 is connected to the power battery cooling system 82 via the conduction valve 83. The controller connects the fuel cell cooling system 81, the power battery cooling system 82 and the conduction valve 83. The vehicle controller 84 is used to execute the above-mentioned vehicle safety control method.

[0071] In this embodiment, the fuel cell cooling system 81 and the power battery cooling system 82 detect the insulation status information of the corresponding batteries within a preset interval time period, and send the corresponding insulation status information to the vehicle controller 84, so as to control the real-time acquisition of the first insulation status information of the fuel cell cooling system 81 and the second insulation status information of the power battery cooling system 82, and judge whether the first insulation status information and the second insulation status information are abnormal according to the first insulation status information and the second insulation status information.

[0072] It should be noted that the fuel cell cooling system 81 and the power battery cooling system 82 send corresponding signals to the vehicle controller 84 as insulation status information. The vehicle controller 84 determines whether the first insulation status information and the second insulation status information are abnormal based on the received signals. Among them, the fuel cell insulation status signal includes a fuel cell no abnormality signal "0", a fuel cell insulation fault warning signal "1" and a fuel cell insulation fault signal "2". The fuel cell insulation fault status signal includes a fuel cell no insulation fault signal "0" and a fuel cell insulation fault signal "1".

[0073] The power battery cooling system 82 sends a power battery insulation status signal and a power battery insulation fault status signal to the vehicle controller 84. The power battery insulation status signal includes a power battery normal abnormality signal "0", a power battery insulation fault warning signal "1" and a power battery insulation fault signal "2". The power battery insulation fault status signal includes a power battery no insulation fault signal "0" and a power battery insulation fault signal "1".

[0074] The vehicle controller 84 determines whether the first insulation state information and the second insulation state information are abnormal according to the received signal, the first insulation state information and the second insulation state information. Among them, the abnormality includes the vehicle insulation state and the vehicle insulation fault state, and the vehicle insulation state corresponding signal includes the signal "00" of the vehicle insulation state without abnormality, the signal "11" of the fuel cell insulation fault warning in the fuel power output mode, the signal "12" of the power battery insulation fault warning in the pure electric power output mode, the signal "13" of the fuel cell insulation fault warning in the hybrid power output mode, the signal "14" of the power battery insulation fault warning in the hybrid power output mode, the signal "15" of the fuel cell and power battery insulation fault warning in the hybrid power output mode, the signal "21" of the fuel cell insulation fault in the fuel power output mode, the signal "22" of the power battery insulation fault in the pure electric power output mode, the signal "23" of the fuel cell insulation fault in the hybrid power output mode, the signal "24" of the power battery insulation fault in the hybrid power output mode, and the signal "25" of the dual battery insulation fault in the hybrid power output mode. The vehicle insulation fault state signal includes the signal "0" of no insulation fault, the signal "1" of the fuel cell insulation fault warning, the signal "2" of the power battery insulation fault, and the signal "3" of the dual battery insulation fault.

[0075] The vehicle's safety control system also includes an instrument display, which is used for user interaction. The instrument display prompt signals include an instrument display no prompt signal "0x0", a fuel cell insulation fault warning, whether to switch to the pure electric power output mode signal "0x1", a power battery insulation fault warning, whether to switch to the fuel power output mode signal "0x2", a fuel cell insulation fault warning, whether to stop for maintenance signal "0x3", a power battery insulation fault warning, whether to stop for maintenance signal "0x4", a dual battery insulation fault warning, whether to stop and power off signal "0x5", a fuel cell insulation fault, switch to the pure electric power output mode signal "1x1", a power battery insulation fault, switch to the fuel power output mode signal "1x2", a fuel cell insulation fault, stop and power off "1x3", a power battery insulation fault, stop and power off signal "1x4", a dual battery insulation fault, stop and power off signal "1x5", whether to switch to the pure electric power output mode signal "2x1", whether to switch to the fuel power output mode signal "2x2", a failure signal to switch to the pure electric power output mode "2x3", and a failure signal to switch to the fuel power output mode "2x4".

[0076] It should be noted that the instrument display includes corresponding prompt lights, and the prompt lights give prompts according to the corresponding prompt signals. If there is no insulation fault, the corresponding prompt signal is "0", and the prompt light is off. If there is an insulation fault warning, the corresponding prompt signal is "1", and the prompt light is yellow. If there is an insulation fault, the corresponding prompt signal is "2", and the prompt light is red.

[0077] When the vehicle controller 84 controls the corresponding mode, it uses the corresponding mode signal to indicate the switch-in and switch-out. For example, the hybrid power output mode signal includes the switch-out hybrid power output mode signal as "0" and the switch-on hybrid power output mode signal as "1". The fuel power output mode signal includes the shut-off fuel cell signal as "0" and the switch-on fuel cell signal as "1". The pure electric power output mode signal includes the shut-off power battery signal as "0" and the switch-on power battery signal as "1".

[0078] In the process of controlling the restricted driving of the vehicle, the signal for controlling the restricted driving of the vehicle includes a signal "0" for not reducing the running speed and power of the vehicle, and a signal "1" for reducing the running speed and power of the vehicle. The signals corresponding to the process of stopping and powering off include a start-up power-on signal and a stop-power-off signal, the start-up power-on signal is "0", and the stop-power-off signal is "1". The signals corresponding to the process of starting and powering on include a stop-power-off signal and a start-up power-on signal, the stop-power-off signal is "0", and the start-power-on signal is "1".

[0079] When the vehicle controller 84 controls the on / off valve, it is turned on and off according to the corresponding on / off, wherein the on signal may be a signal "1" and the off signal may be a signal "0".

[0080] See also Fig. 9 , is a schematic diagram of the structure of a vehicle 90 provided in a tenth embodiment of the present invention, wherein the vehicle 90 includes a vehicle safety control system 80.

Claims

1. A vehicle safety control method, characterized in that: include: collecting first insulation state information of a fuel cell cooling system and second insulation state information of a power battery cooling system in real time, and obtaining a first operation instruction of a user when an abnormality occurs in the first insulation state information and / or the second insulation state information; When the first operation instruction indicates to remove the fault, controlling to open the conduction control valve between the fuel cell cooling system and the power battery cooling system, and detecting whether the abnormality in the second insulation state information is removed; If it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to restrict driving; if it is detected that the abnormality of the second insulation state information has been resolved, the vehicle is controlled to drive according to the second insulation state information collected in real time.

2. The vehicle safety control method according to claim 1, characterized in that: After the real-time acquisition of the first insulation state information of the fuel cell cooling system and the second insulation state information of the power battery cooling system, the method further includes: When the abnormality in the first insulation state information is a fuel cell insulation fault and the abnormality in the second insulation state information is a power battery insulation fault warning, judging the difference between the first insulation resistance value of the fuel cell in the fuel cell cooling system and the preset first threshold value according to the first insulation state information; When the first insulation resistance is greater than a preset first threshold, controlling to open a conduction control valve between the fuel cell cooling system and the power battery cooling system, and detecting whether the abnormality of the second insulation state information is resolved; If it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to restrict driving; if it is detected that the abnormality of the second insulation state information has been resolved, the vehicle is controlled to drive according to the second insulation state information collected in real time.

3. The vehicle safety control method according to claim 2, characterized in that: After determining the difference between the first insulation resistance of the fuel cell in the fuel cell cooling system and the preset first threshold, the method further includes: When the first insulation resistance is not greater than a preset first threshold, controlling the vehicle to limit running; When the abnormality occurring in the second insulation state information is a power battery insulation fault, the control executes a step of obtaining a first operation instruction of the user.

4. The vehicle safety control method according to claim 1, characterized in that: After the real-time acquisition of the first insulation state information of the fuel cell cooling system and the second insulation state information of the power battery cooling system, the method further includes: When the abnormality in the second insulation state information is a power battery insulation fault warning, obtaining the amount of fuel in the fuel cell cooling system; When the amount of fuel in the fuel cell cooling system is less than a preset threshold, controlling the vehicle to enter a pure electric power output mode, opening a conduction control valve between the fuel cell cooling system and the power battery cooling system, and detecting whether the abnormality in the second insulation state information is resolved; If it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to restrict driving; if it is detected that the abnormality of the second insulation state information has been resolved, the vehicle is controlled to drive according to the second insulation state information collected in real time.

5. The vehicle safety control method according to claim 4, characterized in that: After the real-time acquisition of the first insulation state information of the fuel cell cooling system and the second insulation state information of the power battery cooling system, the method further includes: When the abnormality in the first insulation state information is a fuel cell insulation fault warning, and the abnormality in the second insulation state information is a power battery insulation fault warning, obtaining the amount of fuel in the fuel cell cooling system; When the amount of fuel in the fuel cell cooling system is less than the preset threshold, controlling the vehicle to switch into a pure electric power output mode and controlling the vehicle to limit driving; In the pure electric power output mode, judging the difference between a first insulation resistance value of a fuel cell in a fuel cell cooling system and a preset first threshold value according to the first insulation state information; When the first insulation resistance is greater than a preset first threshold, controlling to open a conduction control valve between the fuel cell cooling system and the power battery cooling system, and detecting whether the abnormality of the second insulation state information is resolved; If it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to restrict driving; if it is detected that the abnormality of the second insulation state information has been resolved, the vehicle is controlled to drive according to the second insulation state information collected in real time.

6. The vehicle safety control method according to claim 1, characterized in that: After the real-time acquisition of the first insulation state information of the fuel cell cooling system and the second insulation state information of the power battery cooling system, the method further includes: When the first insulation state information and the second insulation state information are normal, the vehicle is controlled to travel in a hybrid output mode.

7. The vehicle safety control method according to claim 1, characterized in that: After the real-time acquisition of the first insulation state information of the fuel cell cooling system and the second insulation state information of the power battery cooling system, the method further includes: When the abnormality in the first insulation state information is a fuel cell insulation fault warning, and the abnormality in the second insulation state information is a power battery insulation fault warning, obtaining a second operation instruction of the user; When the second operation instruction is not to switch out of the hybrid power output mode, controlling the vehicle to limit running; When the abnormality in the second insulation state information is a power battery insulation fault, controlling the vehicle to switch into a fuel cell power output mode, and obtaining a first operation instruction from a user; When the first operation instruction indicates to remove the fault, controlling to open the conduction control valve between the fuel cell cooling system and the power battery cooling system, and detecting whether the abnormality in the second insulation state information is removed; If it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to restrict driving; if it is detected that the abnormality of the second insulation state information has been resolved, the vehicle is controlled to drive according to the second insulation state information collected in real time.

8. The vehicle safety control method according to claim 7, characterized in that: After controlling the vehicle to limit running when the second operation instruction is not to switch out of the hybrid power output mode, the method further includes: When the abnormality in the first insulation state information is a fuel cell insulation fault, controlling the vehicle to switch into a pure electric power output mode, and judging the difference between a first insulation resistance value of a fuel cell in a fuel cell cooling system and a preset first threshold value according to the first insulation state information; When the first insulation resistance is greater than a preset first threshold, controlling to open a conduction control valve between the fuel cell cooling system and the power battery cooling system, and detecting whether the abnormality of the second insulation state information is resolved; If it is detected that the abnormality of the second insulation state information has not been resolved, the vehicle is controlled to restrict driving; if it is detected that the abnormality of the second insulation state information has been resolved, the vehicle is controlled to drive according to the second insulation state information collected in real time.

9. A safety control system for vehicle insulation failure, characterized in that: include: A fuel cell cooling system, a power battery cooling system, a conduction valve and a controller, wherein the fuel cell cooling system is connected to the power battery cooling system via the conduction valve, the controller connects the fuel cell cooling system, the power battery cooling system and the conduction valve, and the controller is used to execute the vehicle safety control method according to any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle includes a safety control system for vehicle insulation failure.

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