CN115628128A - Automatic fault detection method, device and system for gas drive urea system and storage medium - Google Patents
Automatic fault detection method, device and system for gas drive urea system and storage medium Download PDFInfo
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 196
- 239000004202 carbamide Substances 0.000 title claims abstract description 196
- 238000001514 detection method Methods 0.000 title claims abstract description 103
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 191
- 238000012360 testing method Methods 0.000 claims abstract description 117
- 239000007789 gas Substances 0.000 claims abstract description 89
- 238000002347 injection Methods 0.000 claims abstract description 53
- 239000007924 injection Substances 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 39
- 238000011056 performance test Methods 0.000 claims abstract description 39
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 64
- 238000009825 accumulation Methods 0.000 claims description 41
- 238000011144 upstream manufacturing Methods 0.000 claims description 33
- 229910021529 ammonia Inorganic materials 0.000 claims description 32
- 230000008929 regeneration Effects 0.000 claims description 28
- 238000011069 regeneration method Methods 0.000 claims description 28
- 238000006477 desulfuration reaction Methods 0.000 claims description 25
- 230000023556 desulfurization Effects 0.000 claims description 25
- 239000000243 solution Substances 0.000 claims description 21
- 230000033116 oxidation-reduction process Effects 0.000 claims description 20
- 239000000498 cooling water Substances 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 238000013024 troubleshooting Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 description 11
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
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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
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a method, a device and a system for automatically detecting faults of a gas drive urea system and a storage medium. The method comprises the following steps: receiving a urea nozzle injection test instruction, and executing a urea nozzle injection test to determine whether the urea nozzle has a blockage fault; receiving a deviation test signal of the NOx sensor, and detecting an output value of the NOx sensor to determine whether the output value of the NOx sensor has deviation or not; wherein the NOx sensor includes a front end NOx sensor and a rear end NOx sensor; receiving a nitrogen oxide redox carrier performance test instruction, executing a nitrogen oxide redox carrier performance test, calculating the nitrogen oxide redox efficiency, and determining whether the nitrogen oxide redox carrier has a fault. According to the technical scheme of the embodiment of the invention, the automatic fault detection of the gas drive urea system is realized, the difficulty in troubleshooting is reduced, and the troubleshooting efficiency is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of vehicle exhaust aftertreatment, in particular to a method, a device and a system for automatically detecting faults of a gas drive urea system and a storage medium.
Background
According to the pollutant emission limit value of the heavy diesel vehicle and the requirement of a measuring method (the pollutant emission standard of a national sixth-stage motor vehicle), nitrogen oxide emitted by the diesel engine needs to be treated. The urea solution is used for carrying out oxidation reduction on nitrogen oxides, and the gas-driven urea aftertreatment system can effectively reduce the concentration of the nitrogen oxides in vehicle emissions.
However, during the whole life cycle of vehicle operation, the nitrogen oxide oxidation-Reduction efficiency (SCR efficiency) of the gas-driven urea aftertreatment system is affected by various factors such as oil, urea solution quality, sensors, actuators, and aftertreatment structure design. In the prior art, when a vehicle has a fault of low SCR efficiency, a maintenance worker is required to manually detect a sensor and an actuator of an aftertreatment system, so that the difficulty of troubleshooting is high, and the time consumption is long.
Disclosure of Invention
The invention provides a method, a device and a system for automatically detecting a fault of a gas drive urea system and a storage medium, which are used for automatically detecting the fault of a vehicle with low SCR (selective catalytic reduction) efficiency, effectively reducing the difficulty of troubleshooting and improving the troubleshooting efficiency.
According to one aspect of the invention, an automatic fault detection method for a gas drive urea system is provided, which comprises the following steps:
receiving an injection test instruction of a urea nozzle, and executing an injection test of the urea nozzle to determine whether the urea nozzle has a blockage fault; if not, entering a NOx sensor deviation test;
receiving a deviation test signal of the NOx sensor, and detecting an output value of the NOx sensor to determine whether the output value of the NOx sensor has deviation or not; if not, performing a performance test on the oxynitride redox carrier; wherein the NOx sensors include a front end NOx sensor and a rear end NOx sensor;
receiving a nitrogen oxide redox carrier performance test instruction, executing a nitrogen oxide redox carrier performance test, calculating the nitrogen oxide redox efficiency, and determining whether the nitrogen oxide redox carrier has a fault.
Optionally, before the receiving the NOx sensor deviation test signal and detecting the output value of the NOx sensor to determine whether there is a deviation in the output value of the NOx sensor, the method further includes:
receiving a desulfurization regeneration command, entering a service desulfurization regeneration mode, and executing desulfurization regeneration operation;
and detecting the ammonia storage amount in the oxynitride redox carrier, and automatically entering a NOx sensor deviation test when the ammonia storage amount is 0.
Alternatively, the detecting an output value of the NOx sensor and determining whether there is a deviation in the output value of the NOx sensor includes:
calculating an output difference between the front end NOx sensor and the rear end NOx sensor based on the output value of the front end NOx sensor and the output value of the rear end NOx sensor;
outputting the output difference value to enable a user to look up a table to determine whether the output difference value is within a difference value threshold range; if so, there is no deviation in the output value of the NOx sensor.
Optionally, the performing a nitrogen oxide redox carrier performance test, calculating a nitrogen oxide redox efficiency, and determining whether the nitrogen oxide redox carrier is faulty comprises:
controlling the urea nozzle to spray urea solution according to a first preset feeding ratio, establishing ammonia storage, and entering a nitrogen oxide oxidation-reduction efficiency testing stage when the calculated ammonia storage ratio is larger than an ammonia storage ratio threshold;
in the stage of testing the oxidation-reduction efficiency of the oxynitride, controlling the urea nozzle to inject urea solution at a second preset feeding ratio, and detecting the upstream NOx accumulated amount output by the front-end NOx sensor and the downstream NOx accumulated amount output by the rear-end NOx sensor;
and calculating the oxidation-reduction efficiency of the nitrogen oxide according to the upstream NOx accumulated amount and the downstream NOx accumulated amount, and judging whether the oxidation-reduction carrier of the nitrogen oxide has faults or not.
Alternatively, the detecting an upstream NOx accumulation amount output by the front end NOx sensor and a downstream NOx accumulation amount output by the rear end NOx sensor includes:
and controlling the vehicle to be in a preset working condition, and detecting the upstream NOx accumulated amount and the downstream NOx accumulated amount within a first preset time period.
Optionally, the preset operating condition includes: the normal high-rotation-speed working condition and the plateau row peak working condition are respectively and alternately carried out for a second preset time;
the first preset time comprises a plurality of second preset times;
the upstream NOx accumulation amount includes a plurality of upstream NOx masses for the second preset period, and the downstream NOx accumulation amount includes a plurality of downstream NOx masses for the second preset period.
Optionally, before the receiving the urea nozzle injection test instruction, and executing the urea nozzle injection test to determine whether there is a blockage fault in the urea nozzle, the method further includes:
acquiring the current state of a vehicle, and judging whether the current state of the vehicle meets the preset condition for automatically detecting the fault of the gas drive urea system;
wherein the current vehicle state includes a vehicle speed, an engine cooling water temperature, an ambient temperature, an engine state, a urea tank state, and a state of a particulate trap regeneration switch.
According to another aspect of the invention, an automatic fault detection device for a gas-driven urea system is provided, and the device comprises:
the urea nozzle control module is used for receiving an injection test instruction of the urea nozzle and executing an injection test of the urea nozzle so as to determine whether the urea nozzle has a blockage fault; if not, entering a NOx sensor deviation test;
the sensor deviation testing module is used for receiving a NOx sensor deviation testing signal and detecting an output value of the NOx sensor so as to determine whether the output value of the NOx sensor has deviation; wherein the NOx sensors include a front end NOx sensor and a rear end NOx sensor; if not, performing a performance test on the oxynitride redox carrier;
and the nitrogen oxide redox carrier performance test module is used for receiving the nitrogen oxide redox carrier performance test instruction, executing the nitrogen oxide redox carrier performance test, calculating the nitrogen oxide redox efficiency and determining whether the nitrogen oxide redox carrier has faults or not.
According to another aspect of the present invention, there is also provided an automatic fault detection system for a gas-driven urea system, including: an automatic diagnostic instrument and an automatic fault detection device of the gas drive urea system in the second aspect;
the automatic diagnostic instrument is connected with the automatic fault detection device of the gas drive urea system;
the automatic diagnostic instrument is used for receiving a test instruction input by a user and outputting the test instruction to the automatic fault detection device of the gas drive urea system; and receiving and displaying the test signal and the test result output by the automatic fault detection device of the gas drive urea system.
According to another aspect of the present invention, there is also provided a storage medium containing computer executable instructions for performing the automatic gas drive urea system fault detection method according to the first aspect when executed by a computer processor.
According to the technical scheme of the embodiment of the invention, the urea nozzle injection test is executed by receiving the urea nozzle injection test instruction, and whether the urea nozzle has a blockage fault is determined; receiving a deviation test signal of the NOx sensor, and detecting an output value of the NOx sensor to determine whether the output value of the NOx sensor has deviation or not; receiving a nitrogen oxide oxidation-reduction carrier performance test instruction, executing a nitrogen oxide oxidation-reduction carrier performance test, calculating the nitrogen oxide oxidation-reduction efficiency, and determining whether the SCR efficiency is low due to the fault of the nitrogen oxide oxidation-reduction carrier. The automatic fault detection method for the gas drive urea system, provided by the embodiment of the invention, can realize automatic detection on whether the gas drive urea system has a fault or not, and accurately determine the fault type.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for automatically detecting a fault in a gas driven urea system according to an embodiment of the invention;
FIG. 2 is a schematic flow chart of another automatic fault detection method for a gas-driven urea system, provided by an embodiment of the invention;
FIG. 3 is a flowchart illustrating a specific method of step S130 in an automatic fault detection method for a gas-driven urea system according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of another automatic fault detection method for a gas driven urea system, provided by an embodiment of the invention;
FIG. 5 is a schematic structural diagram of an automatic fault detection device for a gas-driven urea system, provided according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an automatic fault detection system for a gas-driven urea system, provided according to an embodiment of the present invention;
fig. 7 is a schematic signal transmission diagram of the automatic detection device side of the gas drive urea system fault in the automatic detection system of the gas drive urea system fault according to the embodiment of the invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides an automatic fault detection method for a gas drive urea system. Fig. 1 is a flowchart of an automatic fault detection method for a gas drive urea system according to an embodiment of the present invention, where this embodiment is applicable to a case of fault detection for a gas drive urea system, and the method may be implemented by software and/or hardware, and specifically includes the following steps:
s110, receiving a urea nozzle injection test instruction, and executing a urea nozzle injection test to determine whether the urea nozzle has a blockage fault; if not, entering a NOx sensor deviation test.
Specifically, before starting the automatic fault detection of the gas drive urea system, the engine of the vehicle is started and the fault detection of the gas drive urea system is waited. When the engine controller receives a urea nozzle injection test instruction sent by the automatic diagnostic instrument, the automatic diagnostic instrument displays an operation method of the injection test so as to prompt a user to execute preparation work, and the urea nozzle injection test is started to be executed after the preparation work is finished. The preparation work before the injection test comprises the steps of preparing a measuring cup with a specified measuring range, detaching a urea nozzle and aligning the urea nozzle with the measuring cup. The range of the measuring cup to be prepared is related to the model of the vehicle, and the range of the measuring cup can comprise a larger range and a smaller range. The vehicle model with larger displacement corresponds to the measuring cup with larger measuring range, and the vehicle model with smaller displacement corresponds to the measuring cup with smaller measuring range. The automatic diagnostic instrument can automatically prompt the preparation of the measuring cup with a large measuring range according to the input vehicle model.
After the preparation before the urea nozzle injection test is completed, the automatic diagnostic apparatus sends a signal to start the urea nozzle injection test to the engine controller. The engine controller controls the urea nozzle to spray the urea solution until the urea solution is sprayed, and sends a urea nozzle spraying test completion signal to the automatic diagnostic instrument so as to prompt a user that the spraying is finished, and whether the urea nozzle is blocked can be judged according to the actual urea spraying amount.
And comparing the actual urea injection amount indicated in the measuring cup with a preset urea injection amount corresponding to the vehicle model. Whether the urea nozzle has a fault is determined by judging whether the difference value between the actual urea injection quantity and the preset urea injection quantity is within the range of the difference value threshold value. Illustratively, if the difference between the actual urea injection quantity and the preset urea injection quantity is within the range of the difference threshold, the urea nozzle is in a normal state, and no blockage fault exists; if the difference value between the actual urea injection quantity and the preset urea injection quantity is lower than the lower limit value of the difference threshold range, indicating that the urea nozzle is blocked; and if the difference value between the actual urea injection quantity and the preset urea injection quantity is higher than the upper limit value of the difference threshold range, indicating that the urea nozzle has over-injection. If the urea nozzle is in a normal state, continuing to perform subsequent fault tests; and stopping fault detection when the urea nozzle is blocked, and continuing to perform fault detection after a new urea nozzle is replaced.
In addition, if the user can judge whether a fault exists by directly detaching the urea nozzle, the urea nozzle injection test is not needed, and therefore the fault troubleshooting efficiency can be improved.
S120, receiving a deviation test signal of the NOx sensor, and detecting an output value of the NOx sensor to determine whether the output value of the NOx sensor has deviation; if not, performing a performance test on the oxynitride redox carrier; wherein the NOx sensors include a front end NOx sensor and a rear end NOx sensor.
Specifically, after the urea nozzle injection test is completed, the engine controller performs a NOx sensor bias test based on the NOx sensor bias test signal. The front end NOx sensor is arranged at the upstream of the SCR carrier and used for detecting the NOx mass at the upstream of the SCR carrier; a rear NOx sensor is disposed downstream of the SCR carrier for detecting NOx mass downstream of the SCR carrier. The engine controller respectively acquires the NOx mass value output by the front end NOx sensor and the NOx mass value output by the rear end NOx sensor, and judges whether the detection values of the front end NOx sensor and the rear end NOx sensor have deviation or not, so that the false alarm phenomenon of the fault that the SCR efficiency is low occurs.
And the engine controller sends the deviation test data of the NOx sensor to the automatic diagnostic instrument for displaying so that a user can judge the test data to obtain a test result. And if the NOx quality value output by the NOx sensor is determined to have no deviation, continuing to test the performance of the SCR carrier. And if the deviation of the NOx mass value output by the NOx sensor is determined, stopping the automatic fault detection, and continuing to perform fault detection after the front-end NOx sensor and the rear-end NOx sensor are replaced with new ones.
S130, receiving a performance test instruction of the nitrogen oxide redox carrier, executing a performance test of the nitrogen oxide redox carrier, calculating the redox efficiency of the nitrogen oxide, and determining whether the nitrogen oxide redox carrier has a fault.
Specifically, after the deviation test of the NOx sensor is completed, the engine controller receives a nitrogen oxide compound oxidation reduction carrier performance test instruction sent by an automatic diagnostic instrument, namely an SCR carrier performance test instruction, and starts to execute the SCR carrier performance test. During the test, the nitrogen oxide redox efficiency, i.e., SCR efficiency, was calculated. And judging the SCR efficiency to determine whether the SCR carrier is low in SCR efficiency caused by the fault.
According to the technical scheme, the urea nozzle injection test is executed by receiving the urea nozzle injection test instruction, and whether the urea nozzle has a blockage fault is determined; receiving a deviation test signal of the NOx sensor, and detecting the output value of the NOx sensor to determine whether the output value of the NOx sensor has deviation or not; receiving a nitrogen oxide redox carrier performance test instruction, executing a nitrogen oxide redox carrier performance test, calculating nitrogen oxide redox efficiency, and determining whether SCR efficiency is low due to the fact that the nitrogen oxide redox carrier has faults. The automatic fault detection method for the gas drive urea system, provided by the embodiment, can realize automatic detection on whether the gas drive urea system has faults or not, accurately determine the fault type, greatly reduce the difficulty of troubleshooting and improve the troubleshooting efficiency compared with manual detection.
Optionally, fig. 2 is a schematic flow chart of another automatic fault detection method for a gas-driven urea system according to an embodiment of the present invention. On the basis of the above embodiment, as shown in fig. 2, before receiving the NOx sensor deviation test signal, detecting the output value of the NOx sensor to determine whether there is a deviation in the output value of the NOx sensor, the method further includes:
and S111, receiving a desulfurization regeneration command, entering a service desulfurization regeneration mode, and executing desulfurization regeneration operation.
Specifically, in order to ensure the accuracy of the deviation test of the NOx sensor, the ammonia storage amount in the SCR carrier needs to be emptied before the deviation test is performed, so that the problem that the accuracy of the deviation test is affected due to the fact that the quality values of NOx detected by the front end NOx sensor and the rear end NOx sensor are inconsistent because urea solution is consumed by the residual ammonia storage amount in the deviation test is avoided. The desulfurization regeneration mode comprises a driving desulfurization regeneration mode, a parking desulfurization regeneration mode and a service desulfurization regeneration mode. The service desulfurization regeneration mode is a scenario in which desulfurization regeneration is performed under the condition that an automatic diagnostic device is connected with an engine controller and is applied to fault detection. After the engine controller receives a desulfurization regeneration instruction sent by the automatic diagnostic instrument, the vehicle automatically enters a service desulfurization regeneration state, a desulfurization interface is called, and a control system executes desulfurization regeneration operation.
And S112, detecting the ammonia storage amount in the nitrogen oxide oxidation reduction carrier, and automatically entering a NOx sensor deviation test when the ammonia storage amount is 0.
Specifically, during service regeneration desulfurization, the amount of ammonia stored inside the SCR carrier is detected. When the ammonia storage amount is detected to be 0, the ammonia storage amount in the SCR carrier is emptied, the service desulfurization regeneration is completed, and then the NOx sensor deviation test is automatically carried out. It can be seen that the ammonia storage amount of 0 is the NOx sensor deviation test signal. Illustratively, the entire service desulfurization regeneration process lasts about 30 to 40 minutes, and can be adjusted according to actual conditions, and is not limited herein.
Alternatively, with continuing reference to fig. 2 on the basis of the above embodiments, detecting the output value of the NOx sensor and determining whether there is a deviation in the output value of the NOx sensor includes:
and S1201, calculating the output difference value of the front end NOx sensor and the rear end NOx sensor according to the output value of the front end NOx sensor and the output value of the rear end NOx sensor.
Specifically, after entering the NOx sensor deviation test, the urea nozzle is controlled to stop injecting urea solution, the opening degree of a throttle valve is controlled, and whether the ammonia storage amount in the SCR carrier is 0 or not is determined again. When the ammonia storage amount is 0, the NOx sensor bias test is started. In the test process, when it is detected that the front end NOx sensor output value reaches a preset NOx accumulation test value, the front end NOx sensor output value is compared with the NOx accumulation amount at the exhaust emission outlet of the engine. And if the output value of the front end NOx sensor is consistent with the accumulated NOx amount at the exhaust outlet of the engine, subtracting the output value of the front end NOx sensor and the output value of the rear end NOx sensor obtained by detection to obtain the absolute value of the output difference value of the front end NOx sensor and the rear end NOx sensor, and judging whether the detection values of the front end NOx sensor and the rear end NOx sensor have deviation or not according to the absolute value of the output difference value.
S1202, outputting the output difference value to enable a user to check a table to determine whether the output difference value is within the range of the difference value threshold value; if so, there is no deviation in the output value of the NOx sensor.
And the engine controller outputs the output value of the front end NOx sensor, the output value of the rear end NOx sensor and the absolute value of the output difference value of the NOx sensor to an automatic diagnostic instrument for displaying so that a user can check a table according to the absolute value of the tested output difference value to determine whether the NOx sensor has deviation. If the absolute value of the output difference is within the range of the difference threshold, the NOx quality values detected by the front end NOx sensor and the rear end NOx sensor are not deviated, and subsequent fault detection can be continuously carried out; if the absolute value of the output difference is outside the range of the difference threshold, the deviation of the NOx quality values detected by the front end NOx sensor and the rear end NOx sensor is shown, the front end NOx sensor and the rear end NOx sensor need to be replaced, and then subsequent fault detection is carried out.
Optionally, fig. 3 is a flowchart illustrating a specific method in step S130 of the method for automatically detecting a fault of a gas-driven urea system according to an embodiment of the present invention. On the basis of the above embodiments, as shown in fig. 3, the performing a performance test on the oxynitride redox carrier, calculating the oxynitride redox efficiency, and determining whether the oxynitride redox carrier has a fault includes:
s1301, controlling a urea nozzle to spray urea solution according to a first preset feeding ratio, establishing ammonia storage, and entering a nitrogen oxide oxidation-reduction efficiency testing stage when the calculated ammonia storage ratio is larger than an ammonia storage ratio threshold value.
Specifically, after entering the SCR carrier performance test, it is first determined whether the state of the SCR carrier meets the requirements of the performance test. Illustratively, the exhaust flow and the exhaust temperature need to be detected, and if the exhaust flow and the exhaust temperature meet the requirements of the SCR carrier performance test, the SCR carrier performance test can be performed.
Since the ammonia storage amount inside the SCR carrier has been emptied by the service desulfurization regeneration operation in order to ensure the accuracy of the deviation test before the NOx sensor deviation test is performed. When the redox efficiency test of the oxynitride is carried out, namely the SCR efficiency test, a certain ammonia storage amount needs to be arranged in the SCR carrier. Therefore, prior to conducting the SCR efficiency test, a certain amount of ammonia storage must first be injected into the SCR carrier quickly. In order to quickly establish a certain ammonia storage ratio in the SCR carrier, a urea nozzle is controlled to spray urea solution into the SCR carrier at a first preset feeding ratio. For example, the first preset feeding ratio is a relatively large feeding ratio, and can be set according to practical situations, and is not limited herein. Preferably, the first predetermined feed ratio may be selected to be any value in the range of 1.5 to 2.
The calculation of the ammonia storage ratio inside the SCR carrier is continued during the urea solution injection from the urea injection nozzle. And when the calculated ammonia storage ratio is larger than the ammonia storage ratio threshold value, the ammonia storage amount in the SCR carrier at the moment is indicated to meet the requirement of SCR efficiency test, and the SCR efficiency test stage can be started. For example, the ammonia storage ratio threshold may be set by a user according to actual conditions, and is not limited herein.
S1302, in the stage of testing the oxidation-reduction efficiency of the oxynitride, controlling a urea nozzle to inject urea solution at a second preset feeding ratio, and detecting the upstream NOx accumulation amount output by the front-end NOx sensor and the downstream NOx accumulation amount output by the rear-end NOx sensor.
Specifically, in the SCR efficiency testing process, the urea nozzle continuously and stably injects the urea solution into the SCR carrier at a second preset feeding ratio so as to ensure that the SCR carrier fully converts nitrogen oxides in tail gas and keep higher SCR efficiency. Illustratively, the second predetermined feed ratio is a relatively small feed ratio to provide a continuous and smooth injection of urea solution into the interior of the SCR carrier. The second preset feed ratio can be set by the user according to actual conditions, and is not limited herein. Preferably, the second predetermined feed ratio may be any value within the range of 1 to 1.1. During the urea injection, the nitrogen oxide redox reaction continues.
The upstream NOx cumulative amount is the cumulative amount of nitrogen oxides upstream of the SCR substrate over the time of the test period, and the downstream NOx cumulative amount is the cumulative amount of nitrogen oxides downstream of the SCR substrate over the time of the test period. And detecting the upstream NOx accumulation amount output by the front end NOx sensor and the downstream NOx accumulation amount output by the rear end NOx sensor, and under the condition that the NOx quality value output by the front end NOx sensor and the NOx quality value output by the rear end NOx sensor are accurate, obtaining the SCR efficiency by using the upstream NOx accumulation amount and the downstream NOx accumulation amount.
And S1303, calculating the oxidation-reduction efficiency of the nitrogen oxide according to the upstream NOx accumulation amount and the downstream NOx accumulation amount, and judging whether the nitrogen oxide oxidation-reduction carrier has faults or not.
Specifically, using the upstream NOx accumulation amount and the downstream NOx accumulation amount, the SCR efficiency can be calculated according to the following formula:
SCR efficiency = (upstream NOx cumulative amount-downstream NOx cumulative amount)/upstream NOx cumulative amount
If the calculated SCR efficiency is greater than or equal to the SCR efficiency threshold, the SCR efficiency is normal, and therefore, the SCR carrier does not have faults. If the calculated SCR efficiency is smaller than the SCR efficiency threshold, which indicates that the SCR efficiency is low, the reason that the SCR efficiency is low is that the SCR carrier has a fault after the faults of the urea nozzle and the NOx sensor are removed in the above embodiments. For example, the failure of the SCR carrier may include poisoning of the SCR carrier (most of the SCR carrier is sulfur poisoning), large area crystallization or aging shedding inside the SCR carrier, and the like. Therefore, the automatic gas drive urea system fault detection method provided by the embodiment is used for fault troubleshooting, the fault type can be accurately determined, the fault troubleshooting accuracy is improved, and the fault troubleshooting difficulty is reduced.
Alternatively, on the basis of the above-described embodiments, detecting the upstream NOx accumulation amount output from the front end NOx sensor and the downstream NOx accumulation amount output from the rear end NOx sensor includes:
and controlling the vehicle to be in a preset working condition, and detecting the upstream NOx accumulation amount and the downstream NOx accumulation amount within a first preset time period.
Specifically, the preset condition is a running state of the vehicle at the time of NOx accumulation amount detection to simulate detection of the SCR efficiency while the vehicle is running. The first preset duration is a time during which the NOx accumulation amount is detected while the vehicle is in a preset condition. Optionally, the preset operating conditions include: the normal high-rotation-speed working condition and the plateau row peak working condition are respectively and alternately carried out for a second preset time; the first preset time length comprises a plurality of second preset time lengths; the upstream NOx accumulation amount includes upstream NOx masses for a plurality of second preset time periods, and the downstream NOx accumulation amount includes downstream NOx masses for a plurality of second preset time periods.
Specifically, when detecting the upstream NOx accumulation amount and the downstream NOx accumulation amount, the vehicle needs to be controlled to be in a certain preset working condition, the upstream NOx accumulation amount and the downstream NOx accumulation amount of the SCR carrier are detected according to the fact that the vehicle continues for a first preset time period under the preset working condition, SCR efficiency is calculated, and whether the calculated SCR efficiency is smaller than an SCR efficiency threshold value under the preset working condition is judged. For example, the SCR efficiency threshold may be set by a user according to an actual operation condition of the simulated vehicle under a preset operating condition, which is not limited herein. The preset working conditions include a normal high-rotation-speed working condition and a plateau peak elimination working condition, wherein the plateau peak elimination working condition is a working condition that the engine has higher rotation speed compared with the normal high-rotation-speed working condition and is close to an extreme condition. The NOx accumulation amount is detected under the condition that the two working conditions are alternately carried out, so that the accuracy of the calculation result of the SCR efficiency can be improved, and whether the SCR efficiency is low or not is judged accurately due to the fact that the SCR carrier has faults or not is judged.
And simulating the vehicle to alternately operate under two working conditions, operating each working condition for the same second preset time, ending the detection of the NOx accumulation amount until the accumulated time of the second preset time reaches the time of the first preset time, and calculating the SCR efficiency. For example, the first predetermined period may be 40 minutes and the second predetermined period may be 10 minutes for the simulated vehicle to operate at each operating condition. First, the vehicle is simulation-controlled to operate under a normal high-speed condition, and the upstream NOx accumulation amount and the downstream NOx accumulation amount are detected. And after 10 minutes of operation, controlling the vehicle to be switched to the operation under the high exhaust peak working condition, and detecting the upstream NOx accumulated amount and the downstream NOx accumulated amount. After 10 minutes of operation, the operation is switched back to the normal high-speed working condition to be alternately carried out. And when the accumulated running time of the vehicle reaches 40 minutes, stopping the simulation running of the vehicle under the preset working condition, and detecting the final upstream NOx accumulated amount and downstream NOx accumulated amount. Therefore, the upstream NOx accumulation amounts for the second preset periods and the downstream NOx accumulation amounts for the second preset periods are included in the first preset period. According to the plurality of NOx accumulation amount data, the SCR efficiency of the vehicle in the simulated operation can be calculated, so that whether the SCR carrier has a fault or not can be accurately judged.
Alternatively, fig. 4 is a schematic flow chart of another automatic fault detection method for a gas-driven urea system according to an embodiment of the present invention. On the basis of the above embodiments, as shown in fig. 4, before receiving a urea nozzle injection test command and performing a urea nozzle injection test to determine whether a blockage fault exists in a urea nozzle, the method further includes:
s100, acquiring the current state of the vehicle, and judging whether the current state of the vehicle meets the preset condition for automatically detecting the fault of the gas drive urea system; wherein the current vehicle state includes a vehicle speed, an engine cooling water temperature, an ambient temperature, an engine state, a urea tank state, and a state of a particulate trap regeneration switch.
Specifically, the current state of the vehicle comprises various states related to the fault detection of the gas-driven urea system, and the preset condition is a necessary condition required by the vehicle for carrying out the automatic fault detection of the gas-driven urea system. Before automatic fault detection of the gas drive urea system is carried out, whether the current state of a vehicle meets the requirement of a preset condition for fault detection needs to be determined. For example, the vehicle speed included in the current state of the vehicle may be less than 2km/h, i.e. the vehicle is actually in a powered-on and undriven state; the temperature of the cooling water can be more than 20 ℃, and the temperature of the environment where the vehicle is located is more than-20 ℃ so as to ensure that the cooling water or the urea solution can keep a flowing state and cannot be frozen and frozen; the engine is in a starting state to control the vehicle to simulate running under a preset working condition; the pressure build-up of the gas-driven urea tank is completed and a particle trap (DPF) forbids a regeneration switch to be in a closed state so as to ensure that the DPF can be opened in time in a desulfurization regeneration stage. When the current state of the vehicle meets the requirements of the preset conditions, the automatic detection of the fault of the gas drive urea system can be started.
The embodiment of the invention also provides an automatic fault detection device for the gas drive urea system. Fig. 5 is a schematic structural diagram of an automatic fault detection device for a gas-driven urea system according to an embodiment of the present invention. As shown in fig. 5, the automatic detection device 200 for failure of gas-driven urea system includes:
the urea nozzle control module 10 is configured to receive a urea nozzle injection test instruction, and execute a urea nozzle injection test to determine whether a blockage fault exists in a urea nozzle; if not, entering a NOx sensor deviation test;
a sensor deviation test module 20, configured to receive a NOx sensor deviation test signal and detect an output value of the NOx sensor to determine whether there is a deviation in the output value of the NOx sensor; if not, performing a performance test on the oxynitride redox carrier; wherein the NOx sensors include a front end NOx sensor and a rear end NOx sensor;
and the nitrogen oxide redox carrier performance testing module 30 is configured to receive a nitrogen oxide redox carrier performance testing instruction, execute a nitrogen oxide redox carrier performance test, calculate a nitrogen oxide redox efficiency, and determine whether the nitrogen oxide redox carrier has a fault.
The automatic fault detection device for the gas drive urea system, provided by the embodiment of the invention, can execute the automatic fault detection method for the gas drive urea system, provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
The embodiment of the invention also provides an automatic fault detection system for the gas drive urea system. Fig. 6 is a schematic structural diagram of an automatic detection system for a failure of a gas drive urea system according to an embodiment of the present invention, and fig. 7 is a schematic signal transmission diagram of an automatic detection device for a failure of a gas drive urea system in an automatic detection system for a failure of a gas drive urea system according to an embodiment of the present invention. With reference to fig. 6 and 7, the automatic fault detection system for the gas drive urea system comprises: the automatic diagnostic instrument 100 and the automatic detection device 200 for the fault of the gas drive urea system in the embodiment are provided.
The automatic diagnostic apparatus 100 is connected with the automatic fault detection device 200 of the gas drive urea system;
the automatic diagnostic apparatus 100 is used for receiving a test instruction input by a user and outputting the test instruction to the automatic fault detection device 200 of the gas drive urea system; and receiving and displaying the test signal and the test result output by the automatic gas drive urea system fault detection device 200.
Specifically, referring to fig. 7, the automatic gas drive urea system failure detection device 200 is started, and the automatic gas drive urea system failure detection device 200 is in an initial state. Before the automatic fault detection, the automatic gas drive urea system fault detection device 200 enters a test preparation state to determine whether the automatic gas drive urea system fault detection device 200 meets the requirement for automatic fault detection. And after the automatic fault detection requirement is determined to be met, the automatic gas drive urea system fault detection device 200 waits for a test instruction. After the automatic gas drive urea system fault detection device 200 receives the urea nozzle injection test instruction sent by the automatic diagnostic apparatus 100, the automatic gas drive urea system fault detection device 200 executes an injection test. Illustratively, if an abnormal condition occurs or a blockage fault of the urea nozzle is detected in the process of carrying out the injection test, the detection is stopped, the gas-driven urea system is cooled, and the automatic fault detection is finished. The service desulfurization regeneration, the NOx sensor deviation test and the SCR carrier performance test are the same as the urea nozzle injection test, and if an abnormality occurs in the detection process or the detection result shows that a fault exists, the fault detection is immediately ended, which is not described herein again. And if the abnormal condition occurs or the vehicle state does not meet the preset condition of fault detection in the preparation working process before detection, immediately ending the fault detection.
The automatic detection system for the gas drive urea system fault is further provided with a fault detection protection mechanism, namely a stop button is arranged on a display interface of the automatic diagnostic apparatus 100. In the process of automatic fault detection, if the accelerator, the brake or the clutch pedal is operated by mistake or an abnormal condition occurs during automatic fault detection, a stop button on a display interface of the automatic diagnostic apparatus 100 can be directly pressed to terminate the automatic fault detection process of the gas drive urea system, so that the safety of a vehicle in the automatic fault detection process is ensured.
The automatic diagnostic apparatus 100 cooperates with the automatic fault detection device 200 of the gas drive urea system to realize the automatic fault detection of the gas drive urea system and visualize the detection data, so that the user can more intuitively judge the fault type causing the low efficiency of the SCR of the gas drive urea system.
Embodiments of the present invention also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, perform a method for automatic detection of a failure in a gas drive urea system, the method comprising:
receiving a urea nozzle injection test instruction, and executing a urea nozzle injection test to determine whether the urea nozzle has a blockage fault; if not, entering a NOx sensor deviation test;
receiving a deviation test signal of the NOx sensor, and detecting an output value of the NOx sensor to determine whether the output value of the NOx sensor has deviation or not; wherein the NOx sensors include a front end NOx sensor and a rear end NOx sensor; if not, performing a performance test on the oxynitride redox carrier;
receiving a nitrogen oxide redox carrier performance test instruction, executing a nitrogen oxide redox carrier performance test, calculating the nitrogen oxide redox conversion efficiency, and determining whether the nitrogen oxide redox carrier has a fault.
Of course, the storage medium provided by the embodiment of the present invention contains computer-executable instructions, and the computer-executable instructions are not limited to the operations of the method described above, and may also execute the relevant operations in the automatic fault detection method for gas-driven urea system provided by any embodiment of the present invention.
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable on and/or interpret gas drive urea system fault autodetection methods on a programmable system including at least one programmable processor, which may be special purpose or general purpose programmable processor, that receives data and instructions from, and transmits data and instructions to, a storage system, at least one input device, and at least one output device.
Computer programs for implementing the methods of the present invention can be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a machine, partly on a machine, as a stand-alone software package partly on a machine and partly on a remote machine or entirely on a remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for automatically detecting the fault of a gas drive urea system is characterized by comprising the following steps:
receiving an injection test instruction of a urea nozzle, and executing an injection test of the urea nozzle to determine whether the urea nozzle has a blockage fault; if not, entering a NOx sensor deviation test;
receiving a deviation test signal of the NOx sensor, and detecting an output value of the NOx sensor to determine whether the output value of the NOx sensor has deviation or not; if not, performing a performance test on the oxynitride redox carrier; wherein the NOx sensors include a front end NOx sensor and a rear end NOx sensor;
receiving a nitrogen oxide redox carrier performance test instruction, executing a nitrogen oxide redox carrier performance test, calculating the nitrogen oxide redox efficiency, and determining whether the nitrogen oxide redox carrier has a fault.
2. The automatic detection method for faults of the gas-driven urea system according to claim 1, wherein before receiving the deviation test signal of the NOx sensor and detecting the output value of the NOx sensor to determine whether the output value of the NOx sensor has the deviation, the method further comprises the following steps:
receiving a desulfurization regeneration instruction, entering a service desulfurization regeneration mode, and executing desulfurization regeneration operation;
and detecting the ammonia storage amount in the oxynitride redox carrier, and automatically entering a NOx sensor deviation test when the ammonia storage amount is 0.
3. The automatic gas drive urea system fault detection method according to claim 2, wherein the detecting an output value of a NOx sensor and determining whether there is a deviation in the output value of the NOx sensor comprises:
calculating an output difference value of the front end NOx sensor and the rear end NOx sensor according to the output value of the front end NOx sensor and the output value of the rear end NOx sensor;
outputting the output difference value to enable a user to check a table to determine whether the output difference value is within a difference threshold range; if so, there is no deviation in the output value of the NOx sensor.
4. The automatic fault detection method for the gas drive urea system as claimed in claim 1, wherein the performing a performance test of the nox redox carrier, calculating the nox redox efficiency, and determining whether the nox redox carrier has a fault comprises:
controlling the urea nozzle to spray urea solution according to a first preset feeding ratio, establishing ammonia storage, and entering a nitrogen oxide oxidation-reduction efficiency testing stage when the calculated ammonia storage ratio is larger than an ammonia storage ratio threshold;
in the stage of testing the oxidation-reduction efficiency of the oxynitride, controlling the urea nozzle to inject urea solution at a second preset feeding ratio, and detecting the upstream NOx accumulated amount output by the front-end NOx sensor and the downstream NOx accumulated amount output by the rear-end NOx sensor;
and calculating the oxidation-reduction efficiency of the oxynitride according to the upstream NOx accumulation amount and the downstream NOx accumulation amount, and judging whether the oxynitride oxidation-reduction carrier has faults or not.
5. The automatic gas drive urea system fault detection method according to claim 4, wherein the detecting upstream NOx accumulation amount output by the front end NOx sensor and downstream NOx accumulation amount output by the rear end NOx sensor comprises:
and controlling the vehicle to be in a preset working condition, and detecting the upstream NOx accumulated amount and the downstream NOx accumulated amount within a first preset time period.
6. The automatic fault detection method for the gas drive urea system according to claim 5, wherein the preset working conditions comprise: the normal high-rotation-speed working condition and the plateau row peak working condition are respectively working conditions which are alternately carried out for a second preset duration;
the first preset time comprises a plurality of second preset times;
the upstream NOx accumulation amount includes a plurality of upstream NOx masses for the second preset period, and the downstream NOx accumulation amount includes a plurality of downstream NOx masses for the second preset period.
7. The method for automatically detecting the fault of the gas drive urea system according to claim 1, wherein before the receiving the urea nozzle injection test command and executing the urea nozzle injection test to determine whether the urea nozzle has the blockage fault, the method further comprises the following steps:
acquiring the current state of a vehicle, and judging whether the current state of the vehicle meets the preset condition for automatically detecting the fault of the gas drive urea system;
wherein the current vehicle state includes a vehicle speed, an engine cooling water temperature, an ambient temperature, an engine state, a urea tank state, and a state of a particulate trap regeneration switch.
8. The utility model provides a gas drive urea system trouble automatic checkout device which characterized in that includes:
the urea nozzle control module is used for receiving an injection test instruction of the urea nozzle and executing an injection test of the urea nozzle so as to determine whether the urea nozzle has a blockage fault; if not, entering a NOx sensor deviation test;
the sensor deviation testing module is used for receiving a NOx sensor deviation testing signal and detecting an output value of the NOx sensor so as to determine whether the output value of the NOx sensor has deviation or not; wherein the NOx sensors include a front end NOx sensor and a rear end NOx sensor; if not, performing a performance test on the oxynitride redox carrier;
and the nitrogen oxide redox carrier performance test module is used for receiving the nitrogen oxide redox carrier performance test instruction, executing the nitrogen oxide redox carrier performance test, calculating the nitrogen oxide redox efficiency and determining whether the nitrogen oxide redox carrier has faults or not.
9. The automatic fault detection system for the gas drive urea system is characterized by comprising: the automatic diagnostic instrument and the automatic fault detection device for the gas drive urea system as claimed in claim 8;
the automatic diagnostic instrument is connected with the automatic fault detection device of the gas drive urea system;
the automatic diagnostic instrument is used for receiving a test instruction input by a user and outputting the test instruction to the automatic fault detection device of the gas drive urea system; and receiving and displaying the test signal and the test result output by the automatic fault detection device of the gas drive urea system.
10. A storage medium containing computer executable instructions for performing the gas drive urea system fault automatic detection method of any one of claims 1-7 when executed by a computer processor.
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