CN114074552B - Fuel cell automobile insulation detection method and whole automobile controller - Google Patents
Fuel cell automobile insulation detection method and whole automobile controller Download PDFInfo
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- CN114074552B CN114074552B CN202010847911.3A CN202010847911A CN114074552B CN 114074552 B CN114074552 B CN 114074552B CN 202010847911 A CN202010847911 A CN 202010847911A CN 114074552 B CN114074552 B CN 114074552B
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- 239000000446 fuel Substances 0.000 title claims abstract description 347
- 238000009413 insulation Methods 0.000 title claims abstract description 154
- 238000001514 detection method Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 63
- 230000002159 abnormal effect Effects 0.000 claims abstract description 45
- 230000005856 abnormality Effects 0.000 claims abstract description 33
- 239000000306 component Substances 0.000 description 16
- 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
- 238000010586 diagram Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 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
- 230000005611 electricity Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Fuel Cell (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a fuel cell vehicle insulation detection method, which comprises the steps that in the process of switching a fuel cell vehicle from a pure electric driving mode to a fuel cell system and a pure electric common driving mode, if a vehicle insulation value detected by a battery management system is less than or equal to a first threshold value, a whole vehicle controller determines that a battery part is 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, a request instruction for starting the fuel cell system is sent to the fuel cell controller, and in the starting process of the fuel cell system, after insulation abnormality information generated when the vehicle insulation value detected by the battery management system of the fuel cell controller is smaller than or equal to the third threshold value is obtained, the fuel cell system is determined to be abnormal, and the fuel cell controller is enabled to shut down the fuel cell system. By implementing the invention, the problem that abnormal parts cannot be positioned when insulation is abnormal in switching between EV mode and FEV mode of the fuel cell automobile 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 an entire automobile controller.
Background
A fuel cell vehicle is one of electric vehicles, and its core component, a fuel cell, is directly changed into electric power by chemical action (rather than through combustion) of hydrogen and oxygen. The working principle of the fuel cell automobile is 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 drive a front axle (or a rear axle) and other travelling mechanical structures of the automobile to work, so that the electric automobile is driven to advance.
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, there is a possibility that the driver receives an electric shock. Therefore, it is necessary to detect fuel cell vehicle insulation.
At present, the insulation detection of the fuel cell vehicle mainly detects the insulation value of the whole vehicle through a Battery Management System (BMS) and feeds back the insulation value to a whole Vehicle Controller (VCU) and carries out logic judgment by the VCU, but the insulation value changes obviously in the process of switching the fuel cell vehicle running mode between a pure electric driving mode (EV mode) and a combined electric driving mode (FEV mode) of the fuel cell system, so that the VCU cannot accurately position the insulation abnormality, such as the insulation abnormality of EV components or the insulation abnormality of components of the fuel cell system.
Therefore, there is a need for a fuel cell vehicle insulation detection method to solve the problem that abnormal components cannot be located when insulation abnormality occurs in a fuel cell vehicle during switching between EV mode and FEV mode.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide the insulation detection method of the fuel cell automobile and the whole automobile controller, which can solve the problem that abnormal parts cannot be positioned when the insulation abnormality occurs in the switching process of the EV mode and the FEV mode of the fuel cell automobile, and save the cost.
In order to solve the technical problems, an embodiment of the invention provides a fuel cell automobile insulation detection method, which comprises the following steps:
in the process that the fuel cell automobile is switched from a pure electric driving mode to a fuel cell system and a pure electric common driving mode, if the whole automobile controller judges that the vehicle insulation value detected by the battery management system is smaller than or equal to a first threshold value, the abnormal state of a battery part of the fuel cell automobile is judged, and the battery of the fuel cell automobile is powered down to stop running;
in the process of switching the fuel cell vehicle from the pure electric driving mode to the fuel cell system and the pure electric common driving mode, if the whole 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 a preset starting condition, a request instruction for starting the fuel cell system is sent to the fuel cell controller, in the starting process of the fuel cell system, after insulation abnormality information which is received by the fuel cell controller and is generated when the vehicle insulation value detected by the battery management system is smaller than or equal to a third threshold value is obtained, the abnormality of the fuel cell system is identified, and further, an instruction for emergency shutdown of the fuel cell system is sent to the fuel cell controller, so that the fuel cell controller shuts down the fuel cell system and the fuel cell vehicle runs in the pure electric driving mode.
Wherein the method further comprises:
and in the process that the fuel cell vehicle is switched from the pure electric driving mode to the fuel cell system and the pure electric common driving mode, if the whole vehicle controller judges that the vehicle insulation value detected by the battery management system is larger than the first threshold value and smaller than or equal to the second threshold value, a prompt warning message is sent to the fuel cell vehicle, so that the fuel cell vehicle keeps running in the pure electric driving mode.
Wherein the method further comprises:
and in the process of switching the fuel cell vehicle from the pure electric driving mode to the fuel cell system and the pure electric common driving mode, if the whole 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 which is received by the fuel cell controller and is generated when the vehicle insulation value detected by the battery management system is larger than the third threshold and smaller than or equal to the fourth threshold is obtained, the whole vehicle controller sends prompt warning information to the fuel cell vehicle.
Wherein the method further comprises:
and in the process of switching the fuel cell vehicle from the pure electric driving mode to the fuel cell system and the pure electric common driving mode, if the whole 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 which is received by the fuel cell controller and is generated when the vehicle insulation value detected by the battery management system is greater than the fourth threshold value is obtained, determining that the fuel cell controller has normally started the fuel cell system, so that the fuel cell vehicle runs in the fuel cell system and the pure electric common driving mode.
Wherein the first threshold is 50kΩ, the second threshold is 250kΩ, and the third threshold is 50kΩ; the fourth threshold is 100kΩ.
Wherein the method further comprises:
when the fuel cell vehicle runs in the pure electric mode, if the vehicle insulation value detected by the battery management system is smaller than or equal to a fifth threshold value, the whole vehicle controller determines that the battery component of the fuel cell vehicle is abnormal, and enables the battery of the fuel cell vehicle to be powered down to stop running.
Wherein the method further comprises:
when the fuel cell vehicle runs in the mode that the fuel cell system and the pure electric vehicle drive together, if the whole 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 abnormal state of the fuel cell system is judged, and further an instruction for emergently closing the fuel cell system is sent to the fuel cell controller, so that the fuel cell controller closes the fuel cell system, and the fuel cell vehicle returns to the pure electric vehicle drive mode to run.
The embodiment of the invention also provides a vehicle controller, which comprises a first insulation detection abnormal unit and a second insulation detection abnormal unit; wherein,,
the first detection insulation abnormality unit is used for determining that the battery component of the fuel cell vehicle is abnormal and enabling the battery of the fuel cell vehicle to be powered down to stop running if the whole vehicle controller determines that the vehicle insulation value detected by the battery management system is smaller than or equal to a first threshold value in the process of switching the fuel cell vehicle from a pure electric driving mode to a combined electric driving mode of the fuel cell system and the pure electric driving mode;
the second detection abnormal insulation unit is configured to send a request instruction for starting the fuel cell system to the fuel cell controller if the whole 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 in the process of switching the fuel cell vehicle from the pure electric driving mode to the fuel cell system and pure electric common driving mode, and identify that the fuel cell system is abnormal after insulation abnormal information generated when the vehicle insulation value received by the fuel cell controller and determined that the vehicle insulation value detected by the battery management system is less than or equal to a third threshold is obtained in the starting process of the fuel cell system, and further send an instruction for emergency shutdown of the fuel cell system to the fuel cell controller, so that the fuel cell controller returns to the pure electric driving mode for running.
The whole vehicle controller further comprises a third insulation abnormality detection unit; wherein,,
the third detection abnormal insulation unit is configured to send a prompt warning message to the fuel cell vehicle when the vehicle insulation value detected by the battery management system is greater than the first threshold and less than or equal to the second threshold in the process of switching the fuel cell vehicle from the pure electric driving mode to the fuel cell system and pure electric common driving mode, so that the fuel cell vehicle is kept running in the pure electric driving mode.
The whole vehicle controller further comprises a fourth insulation abnormality detection unit; wherein,,
the fourth insulation detecting abnormal unit is configured to send a prompt warning message to the fuel cell vehicle if the whole 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 driving mode to the fuel cell system and pure electric common driving mode, and if the vehicle insulation value detected by the battery management system is greater than the third threshold and less than or equal to the fourth threshold after the vehicle insulation value is received and determined to be greater than the third threshold by the fuel cell controller in the process of starting the fuel cell system.
The embodiment of the invention has the following beneficial effects:
1. the invention solves the problem that the EV component or the fuel cell system component cannot be positioned when the insulation abnormality occurs in the prior fuel cell automobile, thereby not only accurately detecting the insulation value of the automobile, but also saving the cost;
2. when the insulation problem of the whole vehicle is caused by the fuel cell system, the Fuel Cell Controller (FCCU) can report the insulation fault so as to enable the whole vehicle to cut into an EV mode, ensure the safety, ensure the normal operation of the vehicle, and solve the problem that the vehicle cannot operate once the insulation abnormality occurs due to the single detection of the vehicle insulation value.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
FIG. 1 is a flow chart of a fuel cell vehicle insulation detection method according to an embodiment of the present invention;
fig. 2 is an application scenario diagram of a fuel cell automobile insulation detection method provided by an embodiment of the invention;
fig. 3 is a schematic structural diagram of a vehicle controller according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
As shown in fig. 1, in an embodiment of the present invention, a method for detecting insulation of a fuel cell automobile is provided, including the following steps:
step S1, in the process of switching the fuel cell vehicle from a pure electric driving mode to a fuel cell system and a pure electric common driving mode, if the whole 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 abnormal state of a battery part of the fuel cell vehicle is judged, and the battery of the fuel cell vehicle is powered down to stop running;
step S2, in the process of switching the fuel cell vehicle from the pure electric driving mode to the fuel cell system and the pure electric common driving mode, if the whole 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 a preset starting condition, a request instruction for starting the fuel cell system is sent to the fuel cell controller, in the starting process of the fuel cell system, after insulation abnormality information generated when the vehicle insulation value received and judged by the fuel cell controller is smaller than or equal to a third threshold value is obtained, the abnormality of the fuel cell system is judged, and an instruction for emergency shutdown of the fuel cell system is further sent 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 specific process is that the mode switching between the pure electric mode (i.e. EV mode) and the mode switching between the fuel cell system and the pure electric common drive mode (i.e. FEV mode) in the fuel cell automobile can be performed manually or automatically. The vehicle insulation value detected by the battery management system determines whether the fuel cell vehicle is manually or actively switched from the pure electric driving mode to the common driving mode of the fuel cell system and the pure electric driving mode. If the whole vehicle controller determines that the vehicle insulation value detected by the battery management system is greater than a second threshold (such as more than 250KΩ), actively switching from the pure electric mode to the common driving mode of the fuel cell system and the pure electric mode; for another example, if the vehicle insulation value detected by the battery management system is less than or equal to a second threshold (e.g., <=250kΩ), the whole vehicle controller is manually switched from the pure electric mode to the common electric mode.
If the fuel cell vehicle is switched from the pure electric mode to the fuel cell system and the pure electric common mode, there is a risk that the fuel cell system uses both the fuel cell and the high-voltage battery, resulting in electric shock to the driver, so that the insulation change value of the fuel cell vehicle in the process of switching from the pure electric mode to the fuel cell system and the pure electric common mode must be detected.
In step S1, the fuel cell vehicle is manually switched from the pure electric mode to enter a fuel cell system and a pure electric mode, and in the process that the fuel cell vehicle enters the fuel cell system and the pure electric mode from the pure electric mode, if the vehicle insulation value detected by the battery management system is determined to be less than or equal to a first threshold value (such as 50kΩ), the whole vehicle controller determines that the battery component of the fuel cell vehicle is abnormal, and lets the battery of the fuel cell vehicle power down to stop running.
In addition, there are cases where abnormality does not occur in the battery parts but the vehicle insulation value is not large enough at the time of manual switching, so that the fuel cell vehicle continues to maintain running in the pure electric mode, specifically as follows:
the fuel cell vehicle is manually switched from the pure electric mode to enter the fuel cell system and the pure electric common driving mode, and in the process of switching the fuel cell vehicle from the pure electric mode to the fuel cell system and the pure electric common driving mode, if the whole vehicle controller judges that the vehicle insulation value detected by the battery management system is greater than a first threshold value (such as 50KΩ) and less than or equal to a second threshold value (such as 250KΩ), prompt warning information is sent to the fuel cell vehicle, and meanwhile, the fuel cell vehicle is kept running in the pure electric mode.
In step S2, the fuel cell vehicle is actively switched from the pure electric mode to enter the fuel cell system and the pure electric mode (for example, the vehicle insulation value detected by the battery management system is greater than the second threshold value 250kΩ), and in the process that the fuel cell vehicle enters the fuel cell system and the pure electric mode from the pure electric mode, if the fuel cell system meets a preset starting condition (for example, the conditions that the electric power of the high voltage battery in the battery component of the fuel cell vehicle is too low, the SOC is less than 30%, etc.), the whole 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 battery management system, and in the process of starting the fuel cell system, the fuel cell controller judges an insulation value, specifically as follows:
(1) In the starting process of the fuel cell system, the fuel cell controller receives and judges that insulation abnormality information is generated when the vehicle insulation value detected by the battery management system is smaller than or equal to a third threshold value (such as 50KΩ);
(2) 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 third threshold value (such as 50KΩ) and smaller than or equal to a fourth threshold value (such as 100KΩ), and generates abnormal warning information;
(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 greater than a fourth threshold value (such as 100KΩ) to generate switching information;
finally, the whole vehicle controller receives the related information generated by the fuel cell controller and issues different instructions according to the received related information, and the specific steps are as follows:
(a) Aiming at insulation abnormality information generated by a fuel cell controller under the condition (1), after the vehicle controller obtains the insulation abnormality information generated by the fuel cell controller, determining that the fuel cell system is abnormal, and further sending an instruction for emergently closing the fuel cell system to the fuel cell controller to enable the fuel cell controller to close the fuel cell system so as to enable the fuel cell vehicle to run in a back-to-back pure electric driving mode;
(b) Aiming at the insulation abnormal information generated by the fuel cell controller under the condition (2), the whole vehicle controller sends prompt warning information to the fuel cell automobile after acquiring the abnormal warning information generated by the fuel cell controller;
(c) Aiming at the insulation abnormal information generated by the fuel cell controller under the condition (3), after the whole vehicle controller acquires the switching information generated by the fuel cell controller, the fuel cell controller is determined to normally start the fuel cell system, so that the fuel cell vehicle runs in the common driving mode of the fuel cell system and the pure electricity.
It will be appreciated 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 traveling in a single drive mode. Although there is no risk of the driver receiving an electric shock, it is still necessary to locate insulation anomalies in the EV components or in the fuel cell system components of the fuel cell vehicle in the single drive mode for subsequent investigation and maintenance.
For example, when the fuel cell vehicle is running in the pure electric 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 (e.g., 50kΩ), it is determined that an abnormality occurs in a battery part of the fuel cell vehicle, and the battery of the fuel cell vehicle is powered down to stop running.
For another example, when the fuel cell vehicle is in the mode of driving the fuel cell system and the pure electric vehicle, if the whole vehicle controller determines that the vehicle insulation value detected by the battery management system is less than or equal to a sixth threshold (for example, 50kΩ), it is determined that the fuel cell system is abnormal, and further an instruction for emergency shutdown of the fuel cell system is sent 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 vehicle to drive. It should be noted that, by adding the fuel cell controller to perform logic judgment, whether insulation abnormality is caused by intervention of the fuel cell system or not can be accurately positioned, and stable operation is ensured under the premise of ensuring safety of the vehicle.
As shown in fig. 2, an application scenario of a fuel cell automobile insulation detection method in an embodiment of the present invention is further described, which is specifically as follows:
1) The fuel cell vehicle first goes up to high voltage and then enters EV mode. When the fuel cell vehicle 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) The VCU receives the insulation value and judges:
if the vehicle insulation value is more than 250KΩ and other conditions for starting the fuel cell system (such as lower power cell SOC) are satisfied, the whole vehicle controller VCU sends a command for starting the fuel cell system to the fuel cell controller FCCU;
if the vehicle insulation value is more than 250KΩ and more than 50KΩ, the whole vehicle controller VCU does not request the fuel cell system to work, and sends a prompt warning to the fuel cell vehicle, so that the vehicle can maintain running in EV mode;
if 50KΩ is greater than vehicle insulation value, the vehicle controller VCU will not request the fuel cell system to work, insulation problem occurs in EV components, and the fuel cell vehicle can not run
3) When the whole vehicle controller VCU requests the fuel cell to operate, the fuel cell controller FCCU starts to receive an insulation detection signal started by the battery management system BMS, and the fuel cell controller FCCU judges an insulation value in the process of starting the fuel cell system;
if the vehicle insulation value is more than 100KΩ, the fuel cell controller FCCU normally starts the fuel cell system;
if the insulation value of 100KΩ & gtvehicle & gt50KΩ, the fuel cell controller FCCU sends an abnormal warning of the insulation value of the fuel cell system to the whole vehicle controller VCU;
if 50kΩ > vehicle insulation value, the fuel cell controller FCCU sends out fuel cell system insulation abnormality information to the whole vehicle controller VCU, and promptly shuts down the fuel cell system, and it can be confirmed that there is insulation problem in the fuel cell system components.
4) The vehicle control unit VCU receives the insulation abnormality information of the fuel cell system sent by the fuel cell controller FCCU, and then sends out an emergency shutdown fuel cell system command, and the vehicle enters an EV mode.
As shown in fig. 3, in an embodiment of the present invention, a vehicle controller is provided, which includes a first insulation detecting abnormal unit 110 and a second insulation detecting abnormal unit 120; wherein,,
the first detecting insulation abnormality unit 110 is configured to determine that an abnormality occurs in a battery component of the fuel cell vehicle and enable a battery of the fuel cell vehicle to be powered down to stop running if the vehicle insulation value detected by the battery management system is determined to be less than or equal to a first threshold in a process of switching the fuel cell vehicle from a pure electric driving mode to a combined electric driving mode of the fuel cell system and the pure electric driving mode;
the second detection abnormal insulation unit 120 is configured to send a request instruction for starting the fuel cell system to the fuel cell controller if the whole 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 in the process of switching the fuel cell vehicle from the pure electric driving mode to the fuel cell system and pure electric common driving mode, and identify that the fuel cell system is abnormal after insulation abnormality information generated when the vehicle insulation value received by the fuel cell controller and determined that the vehicle insulation value detected by the battery management system is less than or equal to a third threshold is obtained in the process of starting the fuel cell system, and further send an instruction for emergency shutdown of the fuel cell system to the fuel cell controller, so that the fuel cell controller returns to the pure electric driving mode.
Wherein, the whole vehicle controller further comprises a third insulation abnormality detection unit 130; wherein,,
the third detection abnormal insulation unit is configured to send a prompt warning message to the fuel cell vehicle when the vehicle insulation value detected by the battery management system is greater than the first threshold and less than or equal to the second threshold in the process of switching the fuel cell vehicle from the pure electric driving mode to the fuel cell system and pure electric common driving mode, so that the fuel cell vehicle is kept running in the pure electric driving mode.
Wherein, the whole vehicle controller further comprises a fourth insulation abnormality detection unit 140; wherein,,
the fourth insulation detecting abnormal unit is configured to send a prompt warning message to the fuel cell vehicle if the whole 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 driving mode to the fuel cell system and pure electric common driving mode, and if the vehicle insulation value detected by the battery management system is greater than the third threshold and less than or equal to the fourth threshold after the vehicle insulation value is received and determined to be greater than the third threshold by the fuel cell controller in the process of starting the fuel cell system.
The embodiment of the invention has the following beneficial effects:
1. the invention solves the problem that the EV component or the fuel cell system component cannot be positioned when the insulation abnormality occurs in the prior fuel cell automobile, thereby not only accurately detecting the insulation value of the automobile, but also saving the cost;
2. when the insulation problem of the whole vehicle is caused by the fuel cell system, the Fuel Cell Controller (FCCU) can report the insulation fault so as to enable the whole vehicle to cut into an EV mode, ensure the safety, ensure the normal operation of the vehicle, and solve the problem that the vehicle cannot operate once the insulation abnormality occurs due to the single detection of the vehicle insulation value.
It should be noted that, in the above system embodiment, each included system unit is only divided according to the functional logic, but not limited to the above division, so long as the corresponding function can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in implementing the methods of the above embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. A fuel cell vehicle insulation detection method, characterized by comprising the steps of:
in the process that the fuel cell automobile is switched from a pure electric driving mode to a fuel cell system and a pure electric common driving mode, if the whole automobile controller judges that the vehicle insulation value detected by the battery management system is smaller than or equal to a first threshold value, the abnormal state of a battery part of the fuel cell automobile is judged, and the battery of the fuel cell automobile is powered down to stop running;
in the process of switching the fuel cell vehicle from the pure electric driving mode to the fuel cell system and the pure electric common driving mode, if the whole 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 a preset starting condition, a request instruction for starting the fuel cell system is sent to the fuel cell controller, in the starting process of the fuel cell system, after insulation abnormality information which is received by the fuel cell controller and is generated when the vehicle insulation value detected by the battery management system is smaller than or equal to a third threshold value is obtained, the abnormality of the fuel cell system is identified, and further, an instruction for emergency shutdown of the fuel cell system is sent to the fuel cell controller, so that the fuel cell controller shuts down the fuel cell system and the fuel cell vehicle runs in the pure electric driving mode.
2. The fuel cell vehicle insulation detection method according to claim 1, characterized in that the method further comprises:
and in the process that the fuel cell vehicle is switched from the pure electric driving mode to the fuel cell system and the pure electric common driving mode, if the whole vehicle controller judges that the vehicle insulation value detected by the battery management system is larger than the first threshold value and smaller than or equal to the second threshold value, a prompt warning message is sent to the fuel cell vehicle, so that the fuel cell vehicle keeps running in the pure electric driving mode.
3. The fuel cell vehicle insulation detection method according to claim 1, characterized in that the method further comprises:
and in the process of switching the fuel cell vehicle from the pure electric driving mode to the fuel cell system and the pure electric common driving mode, if the whole 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 which is received by the fuel cell controller and is generated when the vehicle insulation value detected by the battery management system is larger than the third threshold and smaller than or equal to the fourth threshold is obtained, the whole vehicle controller sends prompt warning information to the fuel cell vehicle.
4. The fuel cell vehicle insulation detection method according to claim 3, characterized in that the method further comprises:
and in the process of switching the fuel cell vehicle from the pure electric driving mode to the fuel cell system and the pure electric common driving mode, if the whole 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 which is received by the fuel cell controller and is generated when the vehicle insulation value detected by the battery management system is greater than the fourth threshold value is obtained, determining that the fuel cell controller has normally started the fuel cell system, so that the fuel cell vehicle runs in the fuel cell system and the pure electric common driving mode.
5. The fuel cell vehicle insulation detection method according to claim 4, wherein the first threshold is 50kΩ, the second threshold is 250kΩ, and the third threshold is 50kΩ; the fourth threshold is 100kΩ.
6. The fuel cell vehicle insulation detection method according to claim 1, characterized in that the method further comprises:
when the fuel cell vehicle runs in the pure electric mode, if the vehicle insulation value detected by the battery management system is smaller than or equal to a fifth threshold value, the whole vehicle controller determines that the battery component of the fuel cell vehicle is abnormal, and enables the battery of the fuel cell vehicle to be powered down to stop running.
7. The fuel cell vehicle insulation detection method according to claim 1, characterized in that the method further comprises:
when the fuel cell vehicle runs in the mode that the fuel cell system and the pure electric vehicle drive together, if the whole 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 abnormal state of the fuel cell system is judged, and further an instruction for emergently closing the fuel cell system is sent to the fuel cell controller, so that the fuel cell controller closes the fuel cell system, and the fuel cell vehicle returns to the pure electric vehicle drive mode to run.
8. The whole vehicle controller is characterized by comprising a first insulation detection abnormal unit and a second insulation detection abnormal unit; wherein,,
the first detection insulation abnormality unit is used for determining that the battery component of the fuel cell vehicle is abnormal and enabling the battery of the fuel cell vehicle to be powered down to stop running if the whole vehicle controller determines that the vehicle insulation value detected by the battery management system is smaller than or equal to a first threshold value in the process of switching the fuel cell vehicle from a pure electric driving mode to a combined electric driving mode of the fuel cell system and the pure electric driving mode;
the second detection abnormal insulation unit is configured to send a request instruction for starting the fuel cell system to the fuel cell controller if the whole 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 in the process of switching the fuel cell vehicle from the pure electric driving mode to the fuel cell system and pure electric common driving mode, and identify that the fuel cell system is abnormal after insulation abnormal information generated when the vehicle insulation value received by the fuel cell controller and determined that the vehicle insulation value detected by the battery management system is less than or equal to a third threshold is obtained in the starting process of the fuel cell system, and further send an instruction for emergency shutdown of the fuel cell system to the fuel cell controller, so that the fuel cell controller returns to the pure electric driving mode for running.
9. The vehicle controller of claim 8, further comprising a third detection insulation anomaly unit; wherein,,
the third detection abnormal insulation unit is configured to send a prompt warning message to the fuel cell vehicle when the vehicle insulation value detected by the battery management system is greater than the first threshold and less than or equal to the second threshold in the process of switching the fuel cell vehicle from the pure electric driving mode to the fuel cell system and pure electric common driving mode, so that the fuel cell vehicle is kept running in the pure electric driving mode.
10. The vehicle controller of claim 8, further comprising a fourth detection insulation anomaly unit; wherein,,
the fourth insulation detecting abnormal unit is configured to send a prompt warning message to the fuel cell vehicle if the whole 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 driving mode to the fuel cell system and pure electric common driving mode, and if the vehicle insulation value detected by the battery management system is greater than the third threshold and less than or equal to the fourth threshold after the vehicle insulation value is received and determined to be greater than the third threshold by the fuel cell controller in the process of starting the fuel cell system.
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