CN112255552B - Fault diagnosis method and device for temperature acquisition device of fuel cell and vehicle - Google Patents
Fault diagnosis method and device for temperature acquisition device of fuel cell and vehicle Download PDFInfo
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- CN112255552B CN112255552B CN202011494872.XA CN202011494872A CN112255552B CN 112255552 B CN112255552 B CN 112255552B CN 202011494872 A CN202011494872 A CN 202011494872A CN 112255552 B CN112255552 B CN 112255552B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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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
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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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
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0432—Temperature; Ambient temperature
- H01M8/04365—Temperature; Ambient temperature of other components of a fuel cell or fuel cell stacks
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/545—Temperature
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—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
Abstract
The invention discloses a fault diagnosis method for a temperature acquisition device of a fuel cell, which comprises the following steps: acquiring a first temperature difference of a gas bottle in the fuel cell at every interval of a preset time period; judging whether the first temperature differences acquired by the current temperature acquisition device for N times are all larger than a preset fault temperature difference threshold value; if so, judging that the current temperature acquisition device has a fault; if not, judging that the current temperature acquisition device does not have a fault; obtaining the pin voltage of the current temperature acquisition device after judging that the current temperature acquisition device has a fault; judging whether the voltage of the pin is within an abnormal threshold range; if so, judging that the current temperature acquisition device has a contact fault; if not, the current temperature acquisition device is judged to have distortion fault. The invention also discloses a fault diagnosis device of the temperature acquisition device of the fuel cell and a vehicle. By adopting the embodiment of the invention, misdiagnosis caused by the fault of the temperature acquisition device can be effectively avoided, and the stable work of the fuel cell system is ensured.
Description
Technical Field
The invention relates to the field of fuel cells, in particular to a fault diagnosis method and device for a temperature acquisition device of a fuel cell and a vehicle.
Background
For a hydrogen fuel cell, the temperature in a hydrogen bottle is related to the safety of the use of high-pressure hydrogen, and generally, after the temperature in the bottle is detected to exceed a reasonable range, a vehicle-mounted controller closes a bottle valve, the hydrogen supply is cut off, and a fuel cell system stops working. In view of the fact that the hydrogen cylinder temperature sensor works in a high-pressure environment, the hydrogen cylinder temperature sensor has higher requirements on process and reliability compared with a common temperature sensor. In the driving and running process of the fuel cell automobile, the phenomenon of distortion caused by abnormal jumping of the signal of the hydrogen cylinder temperature sensor cannot be completely avoided. When the temperature of the hydrogen cylinder abnormally jumps out of the diagnosis threshold range, the vehicle-mounted controller considers that the temperature of the fuel cell is abnormal at the moment and needs to close the cylinder valve, so that the fuel cell system stops working and the power of the vehicle is lost.
Disclosure of Invention
The embodiment of the invention aims to provide a fault diagnosis method and device for a temperature acquisition device of a fuel cell and a vehicle, which can effectively avoid misdiagnosis caused by faults of the temperature acquisition device and ensure stable operation of a fuel cell system.
In order to achieve the above object, an embodiment of the present invention provides a method for diagnosing a fault of a temperature acquisition device of a fuel cell, including:
acquiring a first temperature difference of a gas bottle in the fuel cell at every interval of a preset time period; the fuel cell comprises at least one fuel gas bottle, at least one temperature acquisition device is arranged on the fuel gas bottle, and the first temperature difference is obtained by the difference between the current temperature of the corresponding fuel gas bottle acquired by the current temperature acquisition device and the temperature of the corresponding fuel gas bottle in the previous time period;
judging whether the first temperature differences acquired by the current temperature acquisition device for N times are all larger than a preset fault temperature difference threshold value, wherein N is an integer larger than 1;
if so, judging that the current temperature acquisition device has a fault; if not, judging that the current temperature acquisition device does not have a fault;
obtaining the pin voltage of the current temperature acquisition device after judging that the current temperature acquisition device has a fault;
judging whether the voltage of the pin is within an abnormal threshold range;
if so, judging that the current temperature acquisition device has a contact fault; if not, the current temperature acquisition device is judged to have distortion fault.
As an improvement of the above scheme, after it is determined that the current temperature acquisition device has a fault, the method further includes:
judging whether all temperature acquisition devices in the fuel cell have faults or not;
if yes, controlling the fuel cell to stop working; if not, correcting the abnormal temperature acquired by the current temperature acquisition device according to a preset temperature correction strategy.
As an improvement of the above scheme, the correcting the temperature acquired by the current temperature acquisition device according to a preset temperature correction strategy includes:
taking the ratio of the abnormal temperature acquired by the current temperature acquisition device to a preset temperature relation coefficient as the corrected normal temperature of the current temperature acquisition device; the temperature relation coefficient is obtained by fitting the temperatures measured under different abnormal working conditions applied to the gas bottle and the temperatures measured under normal working conditions applied to the gas bottle in advance.
As an improvement of the above scheme, after the temperature collected by the current temperature collection device is corrected according to a preset temperature correction strategy, the method further includes:
acquiring a second temperature difference between different gas bottles in response to the power-on operation of the vehicle;
judging whether the second temperature difference is larger than a preset restart temperature difference threshold value or not;
if yes, determining that at least one temperature acquisition device in the fuel cell is in an abnormal state; and if not, judging that all the temperature acquisition devices in the fuel cell are recovered to a normal state.
In order to achieve the above object, an embodiment of the present invention further provides a fault diagnosis device for a temperature acquisition device of a fuel cell, including:
the temperature difference acquisition module is used for acquiring a first temperature difference of a gas bottle in the fuel cell at preset time intervals; the fuel cell comprises at least one fuel gas bottle, at least one temperature acquisition device is arranged on the fuel gas bottle, and the first temperature difference is obtained by the difference between the current temperature of the corresponding fuel gas bottle acquired by the current temperature acquisition device and the temperature of the corresponding fuel gas bottle in the previous time period;
the fault judgment module is used for judging whether the first temperature difference obtained by the current temperature acquisition device for N times is greater than a preset fault temperature difference threshold value or not, wherein N is an integer greater than 1; if so, judging that the current temperature acquisition device has a fault; if not, judging that the current temperature acquisition device does not have a fault; the current temperature acquisition device is also used for acquiring the pin voltage of the current temperature acquisition device after judging that the current temperature acquisition device has a fault; judging whether the voltage of the pin is within an abnormal threshold range; if so, judging that the current temperature acquisition device has a contact fault; if not, the current temperature acquisition device is judged to have distortion fault.
As an improvement of the above solution, the failure determination module is further configured to:
judging whether all temperature acquisition devices in the fuel cell have faults or not; then, the fault diagnosis device for the temperature collection device of the fuel cell further includes:
the fuel cell control module is used for controlling the fuel cell to stop working when all the temperature acquisition devices in the fuel cell have faults;
and the temperature correction module is used for correcting the abnormal temperature acquired by the current temperature acquisition device according to a preset temperature correction strategy when not all the temperature acquisition devices in the fuel cell have faults.
In order to achieve the above object, an embodiment of the present invention further provides a fault diagnosis device for a temperature acquisition device of a fuel cell, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor implements the fault diagnosis method for the temperature acquisition device of the fuel cell according to any one of the above embodiments when executing the computer program.
In order to achieve the above object, an embodiment of the present invention further provides a vehicle, including a fuel cell and the fault diagnosis device for the temperature acquisition device of the fuel cell according to any of the above embodiments.
Compared with the prior art, the method and the device for diagnosing the fault of the temperature acquisition device of the fuel cell and the vehicle provided by the embodiment of the invention have the advantages that the first temperature difference of the gas bottle in the fuel cell is acquired at every preset time interval, and then whether the first temperature differences acquired by the current temperature acquisition device for N times are all larger than the preset fault temperature difference threshold value is judged, wherein N is an integer larger than 1; if so, judging that the current temperature acquisition device has a fault; if not, judging that the current temperature acquisition device does not have a fault. The first temperature difference and the fault temperature difference threshold value are compared, whether the temperature acquisition device breaks down or not can be confirmed, the problem that when the fuel cell stops working due to the fact that the temperature of the gas cylinder of the existing fuel cell system exceeds the physical diagnosis threshold value, whether the signal of the temperature acquisition device is abnormal or the fault really exists cannot be located is solved, misdiagnosis caused by the fault of the temperature acquisition device can be effectively avoided, and stable working of the fuel cell system is guaranteed. In addition, when the temperature acquisition device breaks down, the authenticity reconstruction of the temperature signal can be realized, and the fuel gas SOC can be accurately calculated and the normal operation of the fuel cell system can be ensured on the premise of ensuring the safety.
Drawings
Fig. 1 is a flowchart of a fault diagnosis method for a temperature acquisition device of a fuel cell according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for diagnosing faults of a temperature acquisition device of a fuel cell according to an embodiment of the invention;
fig. 3 is a block diagram of a fault diagnosis device for a temperature acquisition device of a fuel cell according to an embodiment of the present invention;
fig. 4 is a block diagram of another fault diagnosis device for a temperature acquisition device of a fuel cell according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a fault diagnosis method for a temperature acquisition device of a fuel cell according to an embodiment of the present invention, where the fault diagnosis method for the temperature acquisition device of the fuel cell includes:
s1, acquiring a first temperature difference of a gas bottle in the fuel cell at preset time intervals; the fuel cell comprises at least one fuel gas bottle, at least one temperature acquisition device is arranged on the fuel gas bottle, and the first temperature difference is obtained by the difference between the current temperature of the corresponding fuel gas bottle acquired by the current temperature acquisition device and the temperature of the corresponding fuel gas bottle in the previous time period;
s2, judging whether the first temperature differences obtained by the current temperature acquisition device for N times are all larger than a preset fault temperature difference threshold value, wherein N is an integer larger than 1;
s3, if yes, judging that the current temperature acquisition device has a fault; if not, judging that the current temperature acquisition device does not have a fault;
s4, obtaining the pin voltage of the current temperature acquisition device after judging that the current temperature acquisition device has a fault;
s5, judging whether the pin voltage is in an abnormal threshold range;
s6, if yes, judging that the current temperature acquisition device has a contact fault; if not, the current temperature acquisition device is judged to have distortion fault.
It is worth to be noted that the fault diagnosis method for the temperature acquisition device of the fuel cell according to the embodiment of the present invention can be implemented by a vehicle-mounted controller in a vehicle, where the vehicle-mounted controller is a front-end device of a vehicle monitoring and management system, integrates multiple functions such as data processing and data communication, and has a strong service scheduling function and data processing capability.
Optionally, the gas cylinder is a hydrogen cylinder, and the temperature acquisition device is a temperature sensor.
Specifically, before step S1 is executed, it is necessary to perform condition simulation on the fuel cell to establish the temperature relationship coefficient k between the gas bottles. Exemplary operating conditions that may be simulated include: adding fuel gas, normally running (idling, load pulling and load shedding) and stopping. And acquiring volume parameters of the gas bottle under corresponding working conditions, wherein k corresponds to the volume of the gas bottle and the working conditions one to one. On the premise of knowing the working condition and the volume of the gas bottle, the corresponding normal temperature can be obtained by carrying out redundancy calculation according to the abnormal temperature of the gas bottle and the temperature relation coefficient k.
And recording the fault temperature difference threshold value c of the temperature signal change at the moment in the process of working condition simulation. Illustratively, under the working conditions of gas heating, running temperature drop, abnormal temperature and burning temperature, the temperature difference of the temperature acquisition device at the moment when a fault exists is recorded. When the gas cylinder is subjected to gas adding operation under different pressures, the normal temperature range of the gas cylinder can be obtained, the gas cylinder is subjected to gas burning in different degrees, the temperature change condition of the burning gas cylinder can be determined, and the abnormal diagnosis threshold value of the gas cylinder can be determined.
Specifically, in step S1, the current temperature measurement value Y of the current gas bottle is read in real time, the temperature measurement value X is read after a delay for a preset time period, and the first temperature difference Z = X-Y is calculated.
Specifically, in step S2, if | Z | > c, the counter N (initial value is 0) increments by 1, otherwise the counter N is set to 0. And judging whether the first temperature difference obtained by the current temperature acquisition device for N times is greater than a fault temperature difference threshold value c, wherein N is an integer greater than 1.
Specifically, in step S3, when the first temperature differences acquired N times are greater than the fault temperature difference threshold value c, it is determined that the current temperature acquisition device has a fault; and when the first temperature difference which is not greater than the fault temperature difference threshold value c exists in the first temperature differences obtained for N times continuously, judging that the current temperature acquisition device does not have a fault.
In the embodiment of the invention, the first temperature difference and the fault temperature difference threshold are compared, so that whether the temperature acquisition device breaks down or not can be confirmed, the problem that the signal abnormality of the temperature acquisition device or the real fault cannot be positioned when the fuel cell stops working due to the fact that the temperature of the gas cylinder of the fuel cell system exceeds the physical diagnosis threshold at present is solved, misdiagnosis caused by the fault of the temperature acquisition device can be effectively avoided, and the stable working of the fuel cell system is ensured.
Specifically, in steps S4-S6, after the current temperature acquisition device is judged to have a fault, the fault type of the current temperature acquisition device needs to be confirmed; wherein the fault types include a contact fault and a distortion fault. And acquiring the pin voltage of the current temperature acquisition device. Then judging whether the voltage of the pin is in an abnormal threshold range; if so, judging that the current temperature acquisition device has a contact fault; if not, the current temperature acquisition device is judged to have distortion fault.
Specifically, the contact fault includes a short-circuit fault and an open-circuit fault. The open-circuit and short-circuit diagnosis of the temperature acquisition device is diagnosed according to the pin voltage, and when the pin voltage is greater than a preset first voltage threshold value, the temperature acquisition device is judged to be in short circuit with a power supply; when the pin voltage is smaller than or equal to a first voltage threshold and larger than or equal to a preset second voltage threshold, judging that the temperature acquisition device has distortion fault; when the pin voltage is smaller than a second voltage threshold value, judging that the temperature acquisition device is short-circuited or open-circuited to the ground; wherein the first voltage threshold is greater than the second voltage threshold. It should be noted that values of the first voltage threshold and the second voltage threshold need to be determined according to a model of the temperature acquisition device and a hardware configuration, and are not specifically limited herein.
For example, taking a temperature acquisition device powered by 5V as an example, when the pin voltage is greater than 4.5V, it is diagnosed that the power supply is short-circuited; when the pin voltage is less than 0.5V, the short circuit or the open circuit to the ground is diagnosed; when the pin voltage is less than or equal to 4.5V and greater than or equal to 0.5V, a distortion fault is diagnosed.
In the embodiment of the invention, the fault reason of the temperature acquisition device is determined by the pin voltage of the temperature acquisition device, so that the fault type of the temperature acquisition device can be accurately obtained, and a basis is provided for subsequent maintenance/replacement of the temperature acquisition device.
Further, after determining that the temperature acquisition device of the fuel cell has a fault, the method also comprises steps S7-S8:
s7, judging whether all temperature acquisition devices in the fuel cell have faults or not;
s8, if yes, controlling the fuel cell to stop working; if not, correcting the abnormal temperature acquired by the current temperature acquisition device according to a preset temperature correction strategy.
Specifically, when all the temperature acquisition devices are in fault, the fault condition of all the temperature acquisition devices is reported, so that the number of the temperature acquisition devices in fault is large, and the fuel cell system needs to be shut down to ensure the safety of the vehicle. And when all the temperature acquisition devices in the fuel cell are not in fault, correcting the abnormal temperature acquired by the current temperature acquisition device according to a preset temperature correction strategy.
Specifically, the correcting the temperature acquired by the current acquisition device according to a preset temperature correction strategy includes:
and taking the ratio of the abnormal temperature acquired by the current temperature acquisition device to a preset temperature relation coefficient k as the corrected normal temperature of the current temperature acquisition device. It is worth mentioning that, because there are a plurality of temperature relation coefficients k, the volume of the gas bottle and the current working condition of the vehicle need to be obtained to determine the corresponding temperature relation coefficient k, and then the corrected normal temperature of the current temperature acquisition device is obtained. At the moment, the SOC of the abnormal gas bottle is calculated according to the corrected normal temperature, the bottle valve of the gas bottle does not need to be closed, and the normal operation of the fuel cell system is ensured.
In the embodiment of the invention, when the temperature acquisition device fails, the authenticity reconstruction of the temperature signal can be realized, the temperature acquisition device does not need to be replaced, the SOC of the fuel gas is accurately calculated and the normal operation of a fuel cell system is ensured on the premise of ensuring the safety, and the temperature in the fuel gas bottle can be accurately detected and the cost can be saved.
Further, when the temperature acquisition device fails, whether the temperature acquisition device is normal or not can be confirmed by restarting the temperature acquisition device, and at the moment, the vehicle needs to be controlled to be powered on and off again, and the method further comprises S9-S11:
s9, responding to the power-on operation of the vehicle, and acquiring a second temperature difference between different gas bottles;
s10, judging whether the second temperature difference is larger than a preset restarting temperature difference threshold value;
s11, if yes, determining that at least one temperature acquisition device in the fuel cells is in an abnormal state; and if not, judging that all the temperature acquisition devices in the fuel cell are recovered to a normal state.
In particular, since gas bottles of a fuel cell in a vehicle are closely connected together, the temperature difference between the respective gas bottles is not large under normal conditions. If the second temperature difference between the gas bottles is larger than the restart temperature difference threshold value S, indicating that a temperature acquisition device fault still exists at the moment, and repeatedly executing the steps S4-S6; if the second temperature difference between the gas cylinders is less than or equal to the restart temperature difference threshold value s, it indicates that the temperature acquisition device is recovered to be normal after the restart, and the fuel cell system can work normally.
In the embodiment of the invention, the vehicle is powered on and restarted, whether the temperature acquisition device recovers to a normal state is judged according to the temperature difference between the gas bottles acquired by the temperature acquisition device, whether the temperature acquisition device recovers to a normal state can be rapidly confirmed, if the temperature acquisition device still fails after the vehicle is powered on and powered off, the condition that the temperature acquisition device fails is indicated, but the temperature acquisition device may temporarily fail according to the actual condition, and the temperature acquisition device may recover to a normal state after a period of time. Therefore, the embodiment of the invention can identify the abnormality of the temperature acquisition device, ensure the normal running of the vehicle and avoid the vehicle from being anchored on the road due to the temporary failure of the temperature acquisition device.
Further, the process of the above steps S1-S11 can refer to FIG. 2.
Compared with the prior art, the fault diagnosis method for the temperature acquisition device of the fuel cell, provided by the embodiment of the invention, comprises the steps of acquiring the first temperature difference of a gas bottle in the fuel cell at intervals of a preset time period, and then judging whether the first temperature difference acquired by the current temperature acquisition device for N times is greater than a preset fault temperature difference threshold value or not, wherein N is an integer greater than 1; if so, judging that the current temperature acquisition device has a fault; if not, judging that the current temperature acquisition device does not have a fault. The first temperature difference and the fault temperature difference threshold value are compared, whether the temperature acquisition device breaks down or not can be confirmed, the problem that when the fuel cell stops working due to the fact that the temperature of the gas cylinder of the existing fuel cell system exceeds the physical diagnosis threshold value, whether the signal of the temperature acquisition device is abnormal or the fault really exists cannot be located is solved, misdiagnosis caused by the fault of the temperature acquisition device can be effectively avoided, and stable working of the fuel cell system is guaranteed. In addition, when the temperature acquisition device breaks down, the authenticity reconstruction of the temperature signal can be realized, and the fuel gas SOC can be accurately calculated and the normal operation of the fuel cell system can be ensured on the premise of ensuring the safety.
Referring to fig. 3, fig. 3 is a block diagram of a fault diagnosis device 10 for a temperature acquisition device of a fuel cell according to an embodiment of the present invention, where the fault diagnosis device 10 for a temperature acquisition device of a fuel cell includes:
the temperature difference acquisition module 11 is used for acquiring a first temperature difference of a gas bottle in the fuel cell at preset time intervals; the fuel cell comprises at least one fuel gas bottle, at least one temperature acquisition device is arranged on the fuel gas bottle, and the first temperature difference is obtained by the difference between the current temperature of the corresponding fuel gas bottle acquired by the current temperature acquisition device and the temperature of the corresponding fuel gas bottle in the previous time period;
the fault judgment module 12 is configured to judge whether the first temperature differences obtained by the current temperature acquisition device for N consecutive times are all greater than a preset fault temperature difference threshold, where N is an integer greater than 1; if so, judging that the current temperature acquisition device has a fault; if not, judging that the current temperature acquisition device does not have a fault; the current temperature acquisition device is also used for acquiring the pin voltage of the current temperature acquisition device after judging that the current temperature acquisition device has a fault; judging whether the voltage of the pin is within an abnormal threshold range; if so, judging that the current temperature acquisition device has a contact fault; if not, the current temperature acquisition device is judged to have distortion fault.
Further, the failure determination module is further configured to:
judging whether all temperature acquisition devices in the fuel cell have faults or not; then, the temperature collection device failure diagnosis device 10 for a fuel cell further includes:
the fuel cell control module 13 is used for controlling the fuel cell to stop working when all the temperature acquisition devices in the fuel cell have faults;
and the temperature correction module 14 is configured to correct the abnormal temperature acquired by the current temperature acquisition device according to a preset temperature correction strategy when not all temperature acquisition devices in the fuel cell have faults.
Further, the temperature correction module 14 is configured to:
taking the ratio of the abnormal temperature acquired by the current temperature acquisition device to a preset temperature relation coefficient as the corrected normal temperature of the current temperature acquisition device; the temperature relation coefficient is obtained by fitting the temperatures measured under different abnormal working conditions applied to the gas bottle and the temperatures measured under normal working conditions applied to the gas bottle in advance.
Further, after the temperature correction module 14 corrects the temperature collected by the current temperature collection device according to a preset temperature correction strategy,
the temperature difference obtaining module 11 is further configured to: acquiring a second temperature difference between different gas bottles in response to the power-on operation of the vehicle;
the failure determination module 12 is further configured to: judging whether the second temperature difference is larger than a preset restart temperature difference threshold value or not; if yes, determining that at least one temperature acquisition device in the fuel cell is in an abnormal state; and if not, judging that all the temperature acquisition devices in the fuel cell are recovered to a normal state.
It should be noted that, for the working process of each module in the fault diagnosis device 10 for the temperature acquisition device of the fuel cell according to the embodiment of the present invention, please refer to the working process of the fault diagnosis method for the temperature acquisition device of the fuel cell according to the above embodiment, which is not described herein again.
Compared with the prior art, the fault diagnosis device 10 for the temperature acquisition device of the fuel cell obtains the first temperature difference of the gas bottle in the fuel cell at intervals of the preset time period, and then judges whether the first temperature differences obtained by the current temperature acquisition device for N times are all larger than the preset fault temperature difference threshold value, wherein N is an integer larger than 1; if so, judging that the current temperature acquisition device has a fault; if not, judging that the current temperature acquisition device does not have a fault. The first temperature difference and the fault temperature difference threshold value are compared, whether the temperature acquisition device breaks down or not can be confirmed, the problem that when the fuel cell stops working due to the fact that the temperature of the gas cylinder of the existing fuel cell system exceeds the physical diagnosis threshold value, whether the signal of the temperature acquisition device is abnormal or the fault really exists cannot be located is solved, misdiagnosis caused by the fault of the temperature acquisition device can be effectively avoided, and stable working of the fuel cell system is guaranteed. In addition, when the temperature acquisition device breaks down, the authenticity reconstruction of the temperature signal can be realized, and the fuel gas SOC can be accurately calculated and the normal operation of the fuel cell system can be ensured on the premise of ensuring the safety.
Fig. 4 is a block diagram of a fault diagnosis device 20 for a temperature acquisition device of a fuel cell according to another embodiment of the present invention, where the fault diagnosis device 20 for a temperature acquisition device of a fuel cell includes: a processor 21, a memory 22 and a computer program, such as a driving control program, stored in said memory and executable on said processor. The processor 21, when executing the computer program, implements the steps of the above-mentioned method for diagnosing a fault of a temperature acquisition device of a fuel cell, such as the steps S1 to S6 shown in fig. 1. Alternatively, the processor implements the functions of the modules in the device embodiments described above when executing the computer program, for example, the temperature difference acquiring module 11.
Illustratively, the computer program may be divided into one or more modules, which are stored in the memory 22 and executed by the processor 21 to accomplish the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions for describing the execution process of the computer program in the temperature-collecting device failure diagnosis device 20 of the fuel cell. For example, the computer program may be divided into a temperature difference obtaining module 11, a fault determining module 12, a fuel cell control module 13, and a temperature correcting module 14, and specific functions of each module may refer to functions of each module in the fault diagnosis device 10 of the temperature acquisition device of the fuel cell described in the foregoing embodiment, which are not described herein again.
The fault diagnosis device 20 of the temperature acquisition device of the fuel cell may be a desktop computer, a notebook computer, a palm computer, a cloud server, or other computing devices. The fuel cell temperature acquisition device fault diagnosis device 20 may include, but is not limited to, a processor 21 and a memory 22. It will be understood by those skilled in the art that the schematic diagram is merely an example of the image enhancement device, and does not constitute a limitation to the failure diagnosis apparatus 20 for the temperature acquisition device of the fuel cell, and may include more or less components than those shown, or combine some components, or different components, for example, the failure diagnosis apparatus 20 for the temperature acquisition device of the fuel cell may further include an input/output device, a network access device, a bus, etc.
The Processor 21 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, and the processor 21 is a control center of the temperature collection device fault diagnosis device 20 of the fuel cell, and various interfaces and lines are used to connect various parts of the temperature collection device fault diagnosis device 20 of the entire fuel cell.
The memory 22 may be used to store the computer programs and/or modules, and the processor 21 implements various functions of the temperature collection device fault diagnosis device 20 of the fuel cell by operating or executing the computer programs and/or modules stored in the memory 22 and calling up data stored in the memory 22. The memory 22 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory 22 may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The integrated module of the fuel cell temperature acquisition device fault diagnosis device 20 may be stored in a computer readable storage medium if it is implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like.
The embodiment of the invention also provides a vehicle, which comprises a fuel cell and the fault diagnosis device 10 of the temperature acquisition device of the fuel cell in the embodiment. The temperature acquisition device fault diagnosis device 10 of the fuel cell is used for diagnosing whether the temperature acquisition device in the fuel cell is in fault.
For a detailed working process of the fault diagnosis device 10 for the temperature acquisition device of the fuel cell, reference is made to the above embodiment, which is not repeated herein.
Compared with the prior art, the vehicle provided by the embodiment of the invention obtains the first temperature difference of the gas bottle in the fuel cell at preset time intervals, and then judges whether the first temperature differences obtained by the current temperature acquisition device for N times are all larger than a preset fault temperature difference threshold value, wherein N is an integer larger than 1; if so, judging that the current temperature acquisition device has a fault; if not, judging that the current temperature acquisition device does not have a fault. The first temperature difference and the fault temperature difference threshold value are compared, whether the temperature acquisition device breaks down or not can be confirmed, the problem that when the fuel cell stops working due to the fact that the temperature of the gas cylinder of the existing fuel cell system exceeds the physical diagnosis threshold value, whether the signal of the temperature acquisition device is abnormal or the fault really exists cannot be located is solved, misdiagnosis caused by the fault of the temperature acquisition device can be effectively avoided, and stable working of the fuel cell system is guaranteed. In addition, when the temperature acquisition device breaks down, the authenticity reconstruction of the temperature signal can be realized, and the fuel gas SOC can be accurately calculated and the normal operation of the fuel cell system can be ensured on the premise of ensuring the safety.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A fault diagnosis method for a temperature acquisition device of a fuel cell is characterized by comprising the following steps:
acquiring a first temperature difference of a gas bottle in the fuel cell at every interval of a preset time period; the fuel cell comprises at least one fuel gas bottle, at least one temperature acquisition device is arranged on the fuel gas bottle, and the first temperature difference is obtained by the difference between the current temperature of the corresponding fuel gas bottle acquired by the current temperature acquisition device and the temperature of the corresponding fuel gas bottle in the previous time period;
judging whether the first temperature differences acquired by the current temperature acquisition device for N times are all larger than a preset fault temperature difference threshold value, wherein N is an integer larger than 1;
if so, judging that the current temperature acquisition device has a fault; if not, judging that the current temperature acquisition device does not have a fault;
obtaining the pin voltage of the current temperature acquisition device after judging that the current temperature acquisition device has a fault;
judging whether the voltage of the pin is within an abnormal threshold range;
if so, judging that the current temperature acquisition device has a contact fault; if not, the current temperature acquisition device is judged to have distortion fault.
2. The fuel cell temperature-collecting device failure diagnosis method according to claim 1, wherein after it is determined that the current temperature-collecting device has failed, the method further comprises:
judging whether all temperature acquisition devices in the fuel cell have faults or not;
if yes, controlling the fuel cell to stop working; if not, correcting the abnormal temperature acquired by the current temperature acquisition device according to a preset temperature correction strategy.
3. The method for diagnosing the fault of the temperature acquisition device of the fuel cell according to claim 2, wherein the correcting the temperature acquired by the current temperature acquisition device according to a preset temperature correction strategy comprises:
taking the ratio of the abnormal temperature acquired by the current temperature acquisition device to a preset temperature relation coefficient as the corrected normal temperature of the current temperature acquisition device; the temperature relation coefficient is obtained by fitting the temperatures measured under different abnormal working conditions applied to the gas bottle and the temperatures measured under normal working conditions applied to the gas bottle in advance.
4. The method for diagnosing the failure of the temperature collecting device of the fuel cell according to claim 2, wherein after the temperature collected by the current temperature collecting device is corrected according to a preset temperature correction strategy, the method further comprises:
acquiring a second temperature difference between different gas bottles in response to the power-on operation of the vehicle;
judging whether the second temperature difference is larger than a preset restart temperature difference threshold value or not;
if yes, determining that at least one temperature acquisition device in the fuel cell is in an abnormal state; and if not, judging that all the temperature acquisition devices in the fuel cell are recovered to a normal state.
5. A failure diagnosis device for a temperature acquisition device of a fuel cell, comprising:
the temperature difference acquisition module is used for acquiring a first temperature difference of a gas bottle in the fuel cell at preset time intervals; the fuel cell comprises at least one fuel gas bottle, at least one temperature acquisition device is arranged on the fuel gas bottle, and the first temperature difference is obtained by the difference between the current temperature of the corresponding fuel gas bottle acquired by the current temperature acquisition device and the temperature of the corresponding fuel gas bottle in the previous time period;
the fault judgment module is used for judging whether the first temperature difference obtained by the current temperature acquisition device for N times is greater than a preset fault temperature difference threshold value or not, wherein N is an integer greater than 1; if so, judging that the current temperature acquisition device has a fault; if not, judging that the current temperature acquisition device does not have a fault; the current temperature acquisition device is also used for acquiring the pin voltage of the current temperature acquisition device after judging that the current temperature acquisition device has a fault; judging whether the voltage of the pin is within an abnormal threshold range; if so, judging that the current temperature acquisition device has a contact fault; if not, the current temperature acquisition device is judged to have distortion fault.
6. The fuel cell temperature-collecting device failure diagnosis device according to claim 5, wherein the failure determination module is further configured to:
judging whether all temperature acquisition devices in the fuel cell have faults or not; then, the fault diagnosis device for the temperature collection device of the fuel cell further includes:
the fuel cell control module is used for controlling the fuel cell to stop working when all the temperature acquisition devices in the fuel cell have faults;
and the temperature correction module is used for correcting the abnormal temperature acquired by the current temperature acquisition device according to a preset temperature correction strategy when not all the temperature acquisition devices in the fuel cell have faults.
7. A temperature collection device fault diagnosis device for a fuel cell, characterized by comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the temperature collection device fault diagnosis method for a fuel cell according to any one of claims 1 to 4 when executing the computer program.
8. A vehicle comprising a fuel cell and the fuel cell temperature acquisition device failure diagnosis device according to any one of claims 5 to 6.
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| CN113161585A (en) * | 2021-04-02 | 2021-07-23 | 武汉众宇动力系统科技有限公司 | Fault diagnosis method for fuel cell test bench |
| CN113071373B (en) * | 2021-04-25 | 2022-07-29 | 北京新能源汽车股份有限公司 | Temperature prediction and device based on cloud intelligent interconnected big data |
| CN114670712A (en) * | 2022-03-24 | 2022-06-28 | 东风汽车集团股份有限公司 | Temperature control method, vehicle, and storage medium |
| CN115931155A (en) * | 2022-11-28 | 2023-04-07 | 浙江凌骁能源科技有限公司 | Battery temperature rise fault diagnosis method and device, computer equipment and storage medium |
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| JPH10197359A (en) * | 1997-01-16 | 1998-07-31 | Daikin Ind Ltd | Apparatus for diagnosing failure of thermistor |
| CN101216356A (en) * | 2007-01-04 | 2008-07-09 | 海尔集团公司 | Temperature sensor failure testing method and apparatus |
| CN105043593B (en) * | 2015-06-30 | 2017-10-24 | 株洲南车时代电气股份有限公司 | A kind of locomotive temperature sensor fault diagnosis and fault-tolerant method of estimation |
| CN104990644A (en) * | 2015-07-06 | 2015-10-21 | 湖北美的电冰箱有限公司 | Fault detection device and method of temperature sensor for refrigerator |
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