CN114074552A - Fuel cell automobile insulation detection method and vehicle control unit - Google Patents
Fuel cell automobile insulation detection method and vehicle control unit Download PDFInfo
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- CN114074552A CN114074552A CN202010847911.3A CN202010847911A CN114074552A CN 114074552 A CN114074552 A CN 114074552A CN 202010847911 A CN202010847911 A CN 202010847911A CN 114074552 A CN114074552 A CN 114074552A
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- 239000000446 fuel Substances 0.000 title claims abstract description 350
- 238000009413 insulation Methods 0.000 title claims abstract description 144
- 238000001514 detection method Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 63
- 230000002159 abnormal effect Effects 0.000 claims abstract description 46
- 230000005856 abnormality Effects 0.000 claims description 39
- 238000007726 management method Methods 0.000 description 35
- 239000000306 component Substances 0.000 description 18
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- 229910052739 hydrogen Inorganic materials 0.000 description 2
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- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
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- 230000009347 mechanical transmission Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0069—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to the isolation, e.g. ground fault or leak current
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/40—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for controlling a combination of batteries and fuel cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention provides a fuel cell automobile insulation detection method, which comprises the steps that in the process that a fuel cell automobile is switched from a pure electric driving mode to a fuel cell system and pure electric common driving mode, if a vehicle controller judges that the vehicle insulation value detected by a battery management system is smaller than or equal to a first threshold value, a battery part is determined to be abnormal and is powered down; or if the vehicle insulation value detected by the battery management system is larger than the second threshold value and the fuel cell system meets the preset starting condition, sending a request instruction for starting the fuel cell system to the fuel cell controller, and in the starting of the fuel cell system, after insulation abnormal information generated when the vehicle insulation value detected by the battery management system by the fuel cell controller is smaller than or equal to a third threshold value is obtained, determining that the fuel cell system is abnormal, and enabling the fuel cell controller to close the fuel cell system. By implementing the invention, the problem that abnormal parts cannot be positioned when the insulation is abnormal in the switching of the EV mode and the FEV mode of the fuel cell vehicle can be solved.
Description
Technical Field
The invention relates to the technical field of fuel cell automobiles, in particular to a fuel cell automobile insulation detection method and a whole vehicle controller.
Background
The fuel cell automobile is one of electric automobiles, and the core component of the fuel cell automobile is directly changed into electric energy power through the chemical action of hydrogen and oxygen (rather than through combustion). The fuel cell automobile works on the principle that hydrogen as fuel is subjected to oxidation-reduction chemical reaction with oxygen in the atmosphere in the fuel cell to generate electric energy to drive a motor to work, and the motor drives a mechanical transmission structure in the automobile to further drive a front axle (or a rear axle) and other walking mechanical structures of the automobile to work, so that the electric automobile is driven to move forward.
However, since the fuel cell vehicle uses both the fuel cell and the high-voltage battery, if the insulation resistance between the fuel cell and the high-voltage battery is reduced to less than a certain level, it may cause a risk that the driver receives an electric shock. Therefore, it is necessary to detect the fuel cell vehicle insulation.
At present, the insulation detection of a fuel cell vehicle mainly comprises the steps that the insulation value of the vehicle is detected by a Battery Management System (BMS) and fed back to a Vehicle Control Unit (VCU) and is logically judged by the VCU, but the insulation value changes obviously in the switching process of a pure electric drive mode (EV mode) and a fuel cell system and a pure electric common drive mode (FEV mode) of the fuel cell vehicle operation mode, so that the VCU cannot accurately position the cause of the insulation abnormality, such as the insulation abnormality of EV components or the insulation abnormality of fuel cell system components.
Therefore, a method for detecting insulation of a fuel cell vehicle is needed to solve the problem that abnormal components cannot be located when insulation abnormality occurs during switching between an EV mode and an FEV mode of the fuel cell vehicle.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a fuel cell vehicle insulation detection method and a vehicle controller, which can solve the problem that an abnormal component cannot be positioned when an insulation abnormality occurs in a fuel cell vehicle switching process between an EV mode and a FEV mode, and save cost.
In order to solve the technical problem, an embodiment of the present invention provides a fuel cell vehicle insulation detection method, including the following steps:
in the process that the pure electric drive mode of the fuel cell vehicle is switched to the fuel cell system and pure electric common drive mode, if the vehicle controller judges that the vehicle insulation value detected by the battery management system is smaller than or equal to a first threshold value, the vehicle controller determines that a battery component of the fuel cell vehicle is abnormal, and enables the battery of the fuel cell vehicle to be powered off to stop running;
during the process of switching the fuel cell automobile from the pure electric driving mode to the fuel cell system and pure electric co-driving mode, if the vehicle controller judges that the vehicle insulation value detected by the battery management system is larger than a second threshold value and the fuel cell system meets the preset starting condition, a request instruction for starting the fuel cell system is sent to a fuel cell controller, and during the starting of the fuel cell system, after the insulation abnormality information generated when the fuel cell controller receives and determines that the vehicle insulation value detected by the battery management system is equal to or less than the third threshold value is acquired, and determining that the fuel cell system is abnormal, and further sending a command for emergency shutdown of the fuel cell system to the fuel cell controller to enable the fuel cell controller to shut down the fuel cell system and enable the fuel cell vehicle to return to the pure electric driving mode for driving.
Wherein the method further comprises:
in the process that the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode, if the vehicle controller determines that the vehicle insulation value detected by the battery management system is greater than the first threshold value and less than or equal to the second threshold value, a prompt warning message is sent to the fuel cell vehicle, and the fuel cell vehicle is allowed to keep running in the pure electric drive mode.
Wherein the method further comprises:
in the process that the fuel cell automobile is switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode, if the vehicle controller sends a request instruction for starting the fuel cell system to the fuel cell controller, and in the starting process of the fuel cell system, after abnormal warning information generated when the vehicle insulation value detected by the battery management system is received and judged by the fuel cell controller to be greater than the third threshold value and less than or equal to the fourth threshold value is obtained, warning prompting information is sent to the fuel cell automobile.
Wherein the method further comprises:
in the process that the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode, if the vehicle controller sends a request instruction for starting the fuel cell system to the fuel cell controller, and in the starting process of the fuel cell system, after switching information generated when the fuel cell controller receives and determines that the vehicle insulation value detected by the battery management system is greater than the fourth threshold value is acquired, the fuel cell controller is determined to normally start the fuel cell system, and the fuel cell vehicle is allowed to run in the fuel cell system and pure electric common drive mode.
Wherein the first threshold is 50K Ω, the second threshold is 250K Ω, and the third threshold is 50K Ω; the fourth threshold is 100K Ω.
Wherein the method further comprises:
when the fuel cell vehicle runs in the pure electric drive mode, if the vehicle controller judges that the vehicle insulation value detected by the battery management system is smaller than or equal to a fifth threshold value, the vehicle controller determines that a battery component of the fuel cell vehicle is abnormal, and enables the battery of the fuel cell vehicle to be powered off to stop running.
Wherein the method further comprises:
when the fuel cell vehicle runs in the fuel cell system and pure electric common driving mode, if the vehicle controller judges that the vehicle insulation value detected by the battery management system is smaller than or equal to a sixth threshold value, the vehicle controller determines that the fuel cell system is abnormal, and further sends an instruction for emergency shutdown of the fuel cell system to the fuel cell controller, so that the fuel cell controller shuts down the fuel cell system, and the fuel cell vehicle returns to the pure electric driving mode to run.
The embodiment of the invention also provides a vehicle control unit, which comprises a first insulation abnormality detection unit and a second insulation abnormality detection unit; wherein,
the first insulation abnormality detection unit is used for determining that a battery component of the fuel cell vehicle is abnormal and powering down a battery of the fuel cell vehicle to stop running if the vehicle controller determines that the vehicle insulation value detected by the battery management system is less than or equal to a first threshold value in the process that the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode;
the second insulation abnormality detection unit is configured to, in a process that the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and the pure electric common drive mode, send a request instruction for starting the fuel cell system to the fuel cell controller if the vehicle controller determines that the vehicle insulation value detected by the battery management system is greater than a second threshold and the fuel cell system meets a preset starting condition, and in a starting process of the fuel cell system, determine that the fuel cell system is abnormal after obtaining insulation abnormality information generated when the fuel cell controller receives and determines that the vehicle insulation value detected by the battery management system is less than or equal to a third threshold, and further send an instruction for emergency shutdown of the fuel cell system to the fuel cell controller to enable the fuel cell controller to shut down the fuel cell system, and enabling the fuel cell vehicle to return to the pure electric driving mode for running.
The vehicle control unit further comprises a third insulation abnormality detection unit; wherein,
and the third insulation abnormality detection unit is used for sending a prompt warning message to the fuel cell vehicle if the vehicle controller determines that the vehicle insulation value detected by the battery management system is greater than the first threshold value and less than or equal to the second threshold value in the process that the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode, so that the fuel cell vehicle keeps running in the pure electric drive mode.
The vehicle control unit further comprises a fourth insulation abnormality detection unit; wherein,
and the fourth insulation abnormality detection unit is used for sending prompt warning information to the fuel cell vehicle if the vehicle controller sends a request instruction for starting the fuel cell system to the fuel cell controller in the process of switching the fuel cell vehicle from the pure electric drive mode to the fuel cell system and pure electric common drive mode, and after abnormal warning information generated when the vehicle insulation value detected by the battery management system is received and judged by the fuel cell controller to be greater than the third threshold value and less than or equal to the fourth threshold value is obtained in the starting process of the fuel cell system.
The embodiment of the invention has the following beneficial effects:
1. the invention solves the problems that the EV component can not be positioned or the fuel cell system component has abnormal insulation when the current fuel cell vehicle has abnormal insulation, thereby not only accurately detecting the insulation value of the vehicle, but also saving the cost;
2. when the whole vehicle is insulated due to the fuel cell system, the Fuel Cell Controller (FCCU) can report the insulation fault so as to switch the whole vehicle into the EV mode, ensure the normal running of the vehicle while ensuring the safety, and solve the problem that the vehicle cannot run once the insulation abnormality occurs.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a flowchart of a method for detecting insulation of a fuel cell vehicle according to an embodiment of the present invention;
fig. 2 is an application scenario diagram of a fuel cell vehicle insulation detection method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a vehicle control unit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, in an embodiment of the present invention, a method for detecting insulation of a fuel cell vehicle is provided, where the method includes the following steps:
step S1, in the process that the fuel cell vehicle is switched from the pure electric driving mode to the fuel cell system and pure electric common driving mode, if the vehicle controller judges that the vehicle insulation value detected by the battery management system is less than or equal to a first threshold value, the vehicle controller determines that the battery part of the fuel cell vehicle is abnormal, and enables the battery of the fuel cell vehicle to be powered off to stop driving;
step S2, in the process of switching the fuel cell vehicle from the pure electric drive mode to the fuel cell system and pure electric common drive mode, if the vehicle controller determines that the vehicle insulation value detected by the battery management system is greater than the second threshold and the fuel cell system meets the preset start condition, then sending a request instruction for starting the fuel cell system to the fuel cell controller, and in the process of starting the fuel cell system, after obtaining insulation abnormality information generated when the fuel cell controller receives and determines that the vehicle insulation value detected by the battery management system is less than or equal to a third threshold, then determining that the fuel cell system is abnormal, and further sending an instruction for emergency shutdown of the fuel cell system to the fuel cell controller, so that the fuel cell controller shuts down the fuel cell system, and enabling the fuel cell vehicle to return to the pure electric driving mode for running.
The specific process is that the mode switching between the pure electric drive mode (namely EV mode) and the fuel cell system and pure electric common drive mode (namely FEV mode) in the fuel cell vehicle can be carried out manually or automatically. The fuel cell vehicle is manually or actively switched from the pure electric driving mode to the fuel cell system and pure electric common driving mode according to the vehicle insulation value detected by the battery management system. If the vehicle controller judges that the vehicle insulation value detected by the battery management system is larger than a second threshold value (such as more than 250K omega), the vehicle controller actively switches from the pure electric driving mode to the fuel cell system and pure electric common driving mode; for another example, if the vehicle control unit determines that the vehicle insulation value detected by the battery management system is less than or equal to the second threshold value (e.g., < ═ 250K Ω), the vehicle control unit manually switches from the pure electric drive mode to the fuel cell system and the pure electric common drive mode.
As long as the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and the pure electric common drive mode, the risk that a driver receives an electric shock due to the fact that the fuel cell and the high-voltage battery are used in the fuel cell system at the same time exists, and therefore the insulation change value of the fuel cell vehicle in the process of switching from the pure electric drive mode to the fuel cell system and the pure electric common drive mode must be detected.
In step S1, the fuel cell vehicle is manually switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode, and in the process that the fuel cell vehicle enters the fuel cell system and pure electric common drive mode from the pure electric drive mode, if the vehicle controller determines that the vehicle insulation value detected by the battery management system is less than or equal to the first threshold (e.g., 50K Ω), it is determined that the battery component of the fuel cell vehicle is abnormal, and the battery of the fuel cell vehicle is powered off to stop running.
In addition, there is also a case where the vehicle insulation value is not large enough when the battery component is not abnormal but the manual switching is performed, so that the fuel cell vehicle continues to maintain the running in the pure electric drive mode, specifically as follows:
the fuel cell vehicle enters a fuel cell system and pure electric common driving mode from a pure electric driving mode through manual switching, and in the process that the fuel cell vehicle is switched to the fuel cell system and pure electric common driving mode from the pure electric driving mode, if the vehicle controller judges that the vehicle insulation value detected by the battery management system is larger than a first threshold (such as 50K omega) and smaller than or equal to a second threshold (such as 250K omega), the vehicle controller sends prompt warning information to the fuel cell vehicle, and meanwhile, the fuel cell vehicle keeps running in the pure electric driving mode.
In step S2, the fuel cell vehicle is actively switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode (for example, the vehicle insulation value detected by the battery management system > the second threshold value 250K Ω), and in the process that the fuel cell vehicle enters the fuel cell system and pure electric common drive mode from the pure electric drive mode, first, if the fuel cell system meets a preset starting condition (for example, the conditions that the electric power of a high voltage battery in a battery part of the fuel cell vehicle is too low, the SOC is less than 30%, and the like), the vehicle controller sends a request instruction for starting the fuel cell system to the fuel cell controller;
secondly, the added fuel cell controller starts to receive an insulation detection signal detected by the cell management system, and in the process of starting the fuel cell system, the fuel cell controller judges the insulation value, which is as follows:
(1) during the starting process of the fuel cell system, the fuel cell controller receives and judges that insulation abnormal information is generated when the vehicle insulation value detected by the battery management system is smaller than or equal to a third threshold (such as 50K omega);
(2) during the starting process of the fuel cell system, the fuel cell controller receives and judges that abnormal warning information is generated when the vehicle insulation value detected by the battery management system is larger than a third threshold (such as 50K omega) and smaller than or equal to a fourth threshold (such as 100K omega);
(3) during the starting process of the fuel cell system, the fuel cell controller receives and judges that the vehicle insulation value detected by the battery management system is larger than a fourth threshold (such as 100K omega) to generate switching information;
finally, the vehicle control unit receives the relevant information generated by the fuel cell controller, and issues different instructions according to the received relevant information, specifically as follows:
(a) aiming at the insulation abnormal information generated by the fuel cell controller under the condition of the (1), after the vehicle controller obtains the insulation abnormal information generated by the fuel cell controller, the vehicle controller determines that the fuel cell system is abnormal, and further sends an instruction for emergency shutdown of the fuel cell system to the fuel cell controller, so that the fuel cell controller shuts down the fuel cell system, and the fuel cell vehicle returns to the pure electric driving mode to run;
(b) aiming at the insulation abnormal information generated by the fuel cell controller under the condition of (2), after the vehicle controller obtains the abnormal warning information generated by the fuel cell controller, the vehicle controller sends prompt warning information to the fuel cell vehicle;
(c) and (3) aiming at the insulation abnormal information generated by the fuel cell controller under the condition of the (3), after the vehicle controller obtains the switching information generated by the fuel cell controller, determining that the fuel cell controller normally starts the fuel cell system, and enabling the fuel cell vehicle to run in the common driving mode of the fuel cell system and the pure electric vehicle.
It is understood that there is no simultaneous use of the fuel cell and the high-voltage battery in the fuel cell system if the fuel cell vehicle is running in the single driving mode. Although not risking the driver receiving an electric shock, it is necessary to locate whether the EV components or the fuel cell system components of the fuel cell vehicle are isolated in a single drive mode for subsequent troubleshooting and maintenance.
For example, when the fuel cell vehicle is running in the pure electric drive mode, if the vehicle controller determines that the vehicle insulation value detected by the battery management system is equal to or less than a fifth threshold value (e.g., 50K Ω), it determines that an abnormality occurs in the battery component of the fuel cell vehicle, and causes the battery of the fuel cell vehicle to be powered off to stop running.
For another example, when the fuel cell vehicle runs in the fuel cell system and pure electric common drive mode, if the vehicle controller determines that the vehicle insulation value detected by the battery management system is less than or equal to the sixth threshold (e.g., 50K Ω), it is determined that the fuel cell system is abnormal, and further sends an instruction for emergency shutdown of the fuel cell system to the fuel cell controller, so that the fuel cell controller shuts down the fuel cell system, and the fuel cell vehicle returns to the pure electric drive mode to run. It should be noted that, by adding a fuel cell controller to perform logic judgment, whether insulation abnormality is caused by intervention of a fuel cell system can be accurately positioned, and stable operation is ensured on the premise of vehicle safety.
As shown in fig. 2, an application scenario of the fuel cell vehicle insulation detection method in the embodiment of the present invention is further described, specifically as follows:
1) the fuel cell vehicle firstly goes into the EV mode after getting high voltage. When the fuel cell automobile enters the FEV mode from the EV mode, the battery management system BMS detects the current vehicle insulation value and sends the current vehicle insulation value to the vehicle control unit VCU.
2) And the VCU of the vehicle control unit receives the insulation value and judges:
if the vehicle insulation value is larger than 250K omega and other conditions (low SOC of a power battery and the like) for starting the fuel cell system are met, the VCU sends a command for starting the fuel cell system to the FCCU;
if the insulation value of the vehicle is more than 250K omega and more than 50K omega, the VCU of the vehicle control unit does not request the fuel cell system to work, and sends out a prompt warning to the fuel cell vehicle, so that the vehicle control unit can maintain running in an EV mode;
if 50K omega is larger than the vehicle insulation value, the VCU of the vehicle controller does not request the fuel cell system to work, the EV part has insulation problem, and the fuel cell vehicle can not run
3) When the VCU of the whole vehicle controller requests the fuel cell to operate, the FCCU starts to receive an insulation detection signal initiated by the BMS, and judges the insulation value in the process of starting the fuel cell system;
if the vehicle insulation value is larger than 100K omega, the fuel cell controller FCCU normally starts the fuel cell system;
if the insulation value of the vehicle is more than 100K omega and more than 50K omega, the fuel cell controller FCCU sends an abnormal warning of the insulation value of the fuel cell system to the VCU;
if 50K omega is larger than the vehicle insulation value, the fuel cell controller FCCU sends the fuel cell system insulation abnormal information to the vehicle control unit VCU, and the fuel cell system is shut down emergently, so that the condition that the components of the fuel cell system have insulation problems can be confirmed.
4) And the VCU of the vehicle controller receives the abnormal insulation information of the fuel cell system sent by the FCCU, immediately sends a command of emergency shutdown of the fuel cell system, and the vehicle enters an EV mode.
As shown in fig. 3, in an embodiment of the present invention, a vehicle control unit is provided, which includes a first insulation abnormality detection unit 110 and a second insulation abnormality detection unit 120; wherein,
the first insulation abnormality detection unit 110 is configured to, in a process that the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode, if the vehicle controller determines that a vehicle insulation value detected by the battery management system is less than or equal to a first threshold value, determine that a battery component of the fuel cell vehicle is abnormal, and power down a battery of the fuel cell vehicle to stop driving;
the second insulation abnormality detection unit 120 is configured to, in a process that the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and the pure electric common drive mode, send a request instruction for starting the fuel cell system to the fuel cell controller if the vehicle controller determines that the vehicle insulation value detected by the battery management system is greater than a second threshold and the fuel cell system meets a preset starting condition, and in a starting process of the fuel cell system, after insulation abnormality information generated when the fuel cell controller receives and determines that the vehicle insulation value detected by the battery management system is less than or equal to a third threshold is obtained, determine that the fuel cell system is abnormal, and further send an instruction for emergency shutdown of the fuel cell system to the fuel cell controller, so that the fuel cell controller shuts down the fuel cell system, and enabling the fuel cell vehicle to return to the pure electric driving mode for running.
The vehicle control unit further comprises a third insulation abnormality detection unit 130; wherein,
and the third insulation abnormality detection unit is used for sending a prompt warning message to the fuel cell vehicle if the vehicle controller determines that the vehicle insulation value detected by the battery management system is greater than the first threshold value and less than or equal to the second threshold value in the process that the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode, so that the fuel cell vehicle keeps running in the pure electric drive mode.
The vehicle control unit further comprises a fourth insulation abnormality detection unit 140; wherein,
and the fourth insulation abnormality detection unit is used for sending prompt warning information to the fuel cell vehicle if the vehicle controller sends a request instruction for starting the fuel cell system to the fuel cell controller in the process of switching the fuel cell vehicle from the pure electric drive mode to the fuel cell system and pure electric common drive mode, and after abnormal warning information generated when the vehicle insulation value detected by the battery management system is received and judged by the fuel cell controller to be greater than the third threshold value and less than or equal to the fourth threshold value is obtained in the starting process of the fuel cell system.
The embodiment of the invention has the following beneficial effects:
1. the invention solves the problems that the EV component can not be positioned or the fuel cell system component has abnormal insulation when the current fuel cell vehicle has abnormal insulation, thereby not only accurately detecting the insulation value of the vehicle, but also saving the cost;
2. when the whole vehicle is insulated due to the fuel cell system, the Fuel Cell Controller (FCCU) can report the insulation fault so as to switch the whole vehicle into the EV mode, ensure the normal running of the vehicle while ensuring the safety, and solve the problem that the vehicle cannot run once the insulation abnormality occurs.
It should be noted that, in the foregoing system embodiment, each included system unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A fuel cell automobile insulation detection method is characterized by comprising the following steps:
in the process that the pure electric drive mode of the fuel cell vehicle is switched to the fuel cell system and pure electric common drive mode, if the vehicle controller judges that the vehicle insulation value detected by the battery management system is smaller than or equal to a first threshold value, the vehicle controller determines that a battery component of the fuel cell vehicle is abnormal, and enables the battery of the fuel cell vehicle to be powered off to stop running;
during the process of switching the fuel cell automobile from the pure electric driving mode to the fuel cell system and pure electric co-driving mode, if the vehicle controller judges that the vehicle insulation value detected by the battery management system is larger than a second threshold value and the fuel cell system meets the preset starting condition, a request instruction for starting the fuel cell system is sent to a fuel cell controller, and during the starting of the fuel cell system, after the insulation abnormality information generated when the fuel cell controller receives and determines that the vehicle insulation value detected by the battery management system is equal to or less than the third threshold value is acquired, and determining that the fuel cell system is abnormal, and further sending a command for emergency shutdown of the fuel cell system to the fuel cell controller to enable the fuel cell controller to shut down the fuel cell system and enable the fuel cell vehicle to return to the pure electric driving mode for driving.
2. The fuel cell vehicle insulation detection method of claim 1, wherein the method further comprises:
in the process that the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode, if the vehicle controller determines that the vehicle insulation value detected by the battery management system is greater than the first threshold value and less than or equal to the second threshold value, a prompt warning message is sent to the fuel cell vehicle, and the fuel cell vehicle is allowed to keep running in the pure electric drive mode.
3. The fuel cell vehicle insulation detection method of claim 1, wherein the method further comprises:
in the process that the fuel cell automobile is switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode, if the vehicle controller sends a request instruction for starting the fuel cell system to the fuel cell controller, and in the starting process of the fuel cell system, after abnormal warning information generated when the vehicle insulation value detected by the battery management system is received and judged by the fuel cell controller to be greater than the third threshold value and less than or equal to the fourth threshold value is obtained, warning prompting information is sent to the fuel cell automobile.
4. The fuel cell vehicle insulation detection method of claim 3, wherein the method further comprises:
in the process that the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode, if the vehicle controller sends a request instruction for starting the fuel cell system to the fuel cell controller, and in the starting process of the fuel cell system, after switching information generated when the fuel cell controller receives and determines that the vehicle insulation value detected by the battery management system is greater than the fourth threshold value is acquired, the fuel cell controller is determined to normally start the fuel cell system, and the fuel cell vehicle is allowed to run in the fuel cell system and pure electric common drive mode.
5. The fuel cell vehicle insulation detection method of claim 4, wherein the first threshold value is 50K Ω, the second threshold value is 250K Ω, and the third threshold value is 50K Ω; the fourth threshold is 100K Ω.
6. The fuel cell vehicle insulation detection method of claim 1, wherein the method further comprises:
when the fuel cell vehicle runs in the pure electric drive mode, if the vehicle controller judges that the vehicle insulation value detected by the battery management system is smaller than or equal to a fifth threshold value, the vehicle controller determines that a battery component of the fuel cell vehicle is abnormal, and enables the battery of the fuel cell vehicle to be powered off to stop running.
7. The fuel cell vehicle insulation detection method of claim 1, wherein the method further comprises:
when the fuel cell vehicle runs in the fuel cell system and pure electric common driving mode, if the vehicle controller judges that the vehicle insulation value detected by the battery management system is smaller than or equal to a sixth threshold value, the vehicle controller determines that the fuel cell system is abnormal, and further sends an instruction for emergency shutdown of the fuel cell system to the fuel cell controller, so that the fuel cell controller shuts down the fuel cell system, and the fuel cell vehicle returns to the pure electric driving mode to run.
8. The vehicle control unit is characterized by comprising a first insulation abnormality detection unit and a second insulation abnormality detection unit; wherein,
the first insulation abnormality detection unit is used for determining that a battery component of the fuel cell vehicle is abnormal and powering down a battery of the fuel cell vehicle to stop running if the vehicle controller determines that the vehicle insulation value detected by the battery management system is less than or equal to a first threshold value in the process that the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode;
the second insulation abnormality detection unit is configured to, in a process that the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and the pure electric common drive mode, send a request instruction for starting the fuel cell system to the fuel cell controller if the vehicle controller determines that the vehicle insulation value detected by the battery management system is greater than a second threshold and the fuel cell system meets a preset starting condition, and in a starting process of the fuel cell system, determine that the fuel cell system is abnormal after obtaining insulation abnormality information generated when the fuel cell controller receives and determines that the vehicle insulation value detected by the battery management system is less than or equal to a third threshold, and further send an instruction for emergency shutdown of the fuel cell system to the fuel cell controller to enable the fuel cell controller to shut down the fuel cell system, and enabling the fuel cell vehicle to return to the pure electric driving mode for running.
9. The vehicle control unit according to claim 8, further comprising a third detection insulation abnormality unit; wherein,
and the third insulation abnormality detection unit is used for sending a prompt warning message to the fuel cell vehicle if the vehicle controller determines that the vehicle insulation value detected by the battery management system is greater than the first threshold value and less than or equal to the second threshold value in the process that the fuel cell vehicle is switched from the pure electric drive mode to the fuel cell system and pure electric common drive mode, so that the fuel cell vehicle keeps running in the pure electric drive mode.
10. The vehicle control unit according to claim 8, wherein the vehicle control unit further comprises a fourth detection insulation abnormality unit; wherein,
and the fourth insulation abnormality detection unit is used for sending prompt warning information to the fuel cell vehicle if the vehicle controller sends a request instruction for starting the fuel cell system to the fuel cell controller in the process of switching the fuel cell vehicle from the pure electric drive mode to the fuel cell system and pure electric common drive mode, and after abnormal warning information generated when the vehicle insulation value detected by the battery management system is received and judged by the fuel cell controller to be greater than the third threshold value and less than or equal to the fourth threshold value is obtained in the starting process of the fuel cell system.
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