CN116950812A - High-load pipeline desorption flow diagnosis method, device and storage medium - Google Patents
High-load pipeline desorption flow diagnosis method, device and storage medium Download PDFInfo
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- CN116950812A CN116950812A CN202310969687.9A CN202310969687A CN116950812A CN 116950812 A CN116950812 A CN 116950812A CN 202310969687 A CN202310969687 A CN 202310969687A CN 116950812 A CN116950812 A CN 116950812A
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- 238000003795 desorption Methods 0.000 title claims abstract description 134
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000003745 diagnosis Methods 0.000 title abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 88
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 88
- 238000002405 diagnostic procedure Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000001704 evaporation Methods 0.000 description 14
- 230000008020 evaporation Effects 0.000 description 14
- 238000012544 monitoring process Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 4
- 238000012790 confirmation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 241000976924 Inca Species 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0809—Judging failure of purge control system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/003—Adding fuel vapours, e.g. drawn from engine fuel reservoir
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- 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)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Testing Of Engines (AREA)
Abstract
The invention discloses a desorption flow diagnosis method of a high-load pipeline, which comprises the following steps: controlling the carbon tank valve to be opened; judging whether the difference between the air pressure value after the carbon tank valve is opened and the air pressure value before the carbon tank valve is opened is larger than a preset first air pressure threshold value; when the difference between the air pressure value after the carbon tank valve is opened and the air pressure value before the carbon tank valve is opened is not more than a first air pressure threshold value, further judging whether the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is more than a preset second air pressure threshold value or not; when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than a preset second air pressure threshold value. Corresponding apparatus and storage medium are also included. The invention has the beneficial effects that the fault diagnosis comprises a plurality of diagnosis paths, can effectively distinguish the fault from one or two of the situations of normally closed carbon tank valve clamping, high-load desorption pipeline blockage, normally open carbon tank valve clamping and high-load desorption pipeline disconnection, and has good guiding effect on the maintenance of vehicles.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a desorption flow diagnosis method and device for a high-load pipeline and a storage medium.
Background
Automobiles include evaporative systems for temporarily retaining evaporative contaminants lost from the fuel system of the automobile, preventing them from escaping to the atmosphere, and delivering the evaporative contaminants to the engine for combustion when appropriate. Fig. 1 is a schematic diagram of a system arrangement structure of a dual desorption pipeline in an evaporation system, in fig. 1, P1 is pressure of a pressure sensor of a high-load desorption pipeline, P2 is pressure in a venturi tube, calculated, P3 is boost pressure, and P4 is pressure before turbocharging.
From state VI, regulations mandate that OBD systems (on-board automatic diagnostic systems, computer systems inside automobiles) be able to monitor evaporation systems, including specifically both desorption flow monitoring and leakage monitoring. The OBD system acquires corresponding data through a sensor arranged on the evaporation system, and realizes the monitoring through data processing.
For desorption flow monitoring, regulations require that the OBD system be able to detect evaporation system failure when: (1) When the OBD system does not monitor the desorption flow from the fuel vaporization system to the engine (to the area where the engine intake system is closed); (2) For high load desorption lines on supercharged air-intake engine vehicles (e.g., canister vaporization system desorption lines at intake manifold pressures greater than ambient pressure), the OBD system should be able to monitor for failure if there is no desorption airflow from the vaporization system to the engine. As shown in fig. 1, the right (downstream) desorption line (excluding the engine intake system line) is a desorption flow diagnostic section bounded by the carbon canister valve CPV. The condition (1) corresponds to the low-load pipeline desorption flow monitoring, and the condition (2) corresponds to the high-load desorption pipeline desorption flow monitoring.
For a supercharged engine, the manifold pressure under the supercharging condition is greater than the atmospheric pressure, and at this time, desorption of the carbon canister cannot be performed. In order to meet the requirement of the type IV test, an additional desorption pipeline is needed to be added to improve the desorption capacity of the carbon tank of the whole system, and the carbon tank can be desorbed under a pressurized state by the pipeline, which is called a high-load desorption pipeline, such as a C pipe in fig. 1, and the pressure acquired at a pressure sensor on the high-load desorption pipeline is recorded as P1. The high-load desorption pipeline is blocked or disconnected, so that the desorption function of the carbon tank cannot be realized, and related faults are reported. The desorption power for the high load desorption line (C-line) is typically derived from the negative pressure generated downstream of the air cleaner or upstream of the turbocharger during high load operation of the engine. Since the negative pressure is not as great and stable as the negative pressure in the intake manifold, a venturi is usually added to fully develop the capability of the high-load desorption line, and the pressure in the venturi is calculated according to the pressure before and after pressurization and the characteristic curve of the venturi and recorded as P2.
The existing OBD system has the following defects when monitoring a high-load desorption pipeline:
1) The existing high-load desorption pipeline fault only has one fault path, and cannot distinguish whether the carbon tank valve is stuck normally closed (or the high-load desorption pipeline is blocked) or is stuck normally open (or the high-load desorption pipeline is disconnected);
2) The current diagnosis strategy can not accurately distinguish different fault phenomena of the high-load desorption pipeline and can not guide maintenance well; repair may be misled.
Disclosure of Invention
In order to solve the above problems, one of the purposes of the present invention is to provide a method for diagnosing desorption flow of a high-load pipeline, which comprises the following steps:
a method for diagnosing desorption flow of a high-load pipeline, comprising:
controlling the carbon tank valve to be opened;
judging whether the difference between the air pressure value after the carbon tank valve is opened and the air pressure value before the carbon tank valve is opened is larger than a preset first air pressure threshold value;
when the difference between the air pressure value after the carbon tank valve is opened and the air pressure value before the carbon tank valve is opened is not more than the first air pressure threshold value, further judging whether the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is more than a preset second air pressure threshold value or not;
and when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than a preset second air pressure threshold value and the duration time is larger than a preset first time threshold value, judging that the carbon tank valve is stuck normally open or the high-load desorption pipeline is disconnected.
In some preferred embodiments, the step of determining whether the difference between the real-time air pressure value in the high-load desorption line and the real-time air pressure value in the venturi is greater than the second air pressure threshold value comprises:
and when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is not more than the second air pressure threshold value, or the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is more than the second air pressure threshold value but the duration time is not more than the first time threshold value, judging that the carbon tank valve is stuck normally closed or the high-load desorption pipeline is blocked.
In some preferred embodiments, the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is greater than a preset second air pressure threshold value, the duration is greater than a preset first time threshold value, and when at least one occurrence occurs, the carbon tank valve is judged to be stuck normally open or the high-load desorption pipeline is judged to be disconnected.
In some preferred embodiments, when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is not greater than the second air pressure threshold value at least once, the carbon tank valve is judged to be stuck normally closed or the high-load desorption pipeline is judged to be blocked.
In some preferred embodiments, when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is greater than the second air pressure threshold value but the duration is not greater than the first time threshold value at least once, the carbon tank valve is judged to be stuck normally closed or the high-load desorption pipeline is judged to be blocked.
In some preferred embodiments, the canister valve is judged to be normal when the difference between the air pressure values after and before opening is greater than the first air pressure threshold.
Another object of the present invention is to provide a desorption flow diagnosis device, comprising:
the control module is used for controlling the opening of the carbon tank valve;
the judging module is used for judging whether the difference between the air pressure values after the carbon tank valve is opened and before the carbon tank valve is opened is larger than a preset first air pressure threshold value;
the fault confirming module is used for confirming a fault state according to whether the difference between the air pressure values after the carbon tank valve is opened and before the carbon tank valve is opened is larger than the first air pressure threshold value;
the fault type identification module is used for identifying a specific fault type according to whether the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than a preset second air pressure threshold value or not and whether the duration time is larger than a preset first time threshold value or not.
In some preferred embodiments, further comprising:
the counting module is used for calculating the occurrence times of the events, and the events comprise:
the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than a preset second air pressure threshold value, and the duration time is larger than a preset first time threshold value;
the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is not more than the second air pressure threshold value;
the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than the second air pressure threshold value but the duration is not larger than the first time threshold value.
In some preferred embodiments, the event further comprises:
the difference between the air pressure value after and before the opening of the carbon tank valve is greater than the first air pressure threshold.
It is a further object of the present invention to provide a non-transitory computer readable storage medium storing computer instructions for causing a computer to execute the desorption flow diagnosis method according to any one of the preceding claims.
The beneficial effects are that: the invention comprises a plurality of diagnosis paths aiming at fault diagnosis, can effectively distinguish the fault from one or two of the conditions of normally closed carbon tank valve clamping, high-load desorption pipeline blockage, normally open carbon tank valve clamping and high-load desorption pipeline disconnection, and has good guiding effect on vehicle maintenance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a vehicle evaporation system.
Fig. 2 is a schematic structural view of the diagnostic device of the present invention.
FIG. 3 is a flow chart of an embodiment of the diagnostic method of the present invention.
FIG. 4 is a detailed flow chart illustrating steps of an embodiment of the diagnostic method of the present invention.
FIG. 5 is a flow chart illustrating further detailed steps of an embodiment of the diagnostic method of the present invention.
FIG. 6 is a flow chart illustrating further detailed steps of an embodiment of the diagnostic method of the present invention.
Fig. 7 is a signal variation display diagram corresponding to a diagnosis method performed by the diagnosis device in the normally closed failure of the carbon tank valve according to an embodiment of the present invention.
Fig. 8 is a signal variation display diagram corresponding to a diagnosis method executed by the diagnosis device in the normally open failure of the carbon tank valve according to an embodiment of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Fig. 1 is a schematic diagram of a vehicle evaporation system, and it can be seen from the diagram that the pressure sensor of the high-load desorption pipeline is arranged at the C pipe to obtain the air pressure value P1 in the C pipe.
The data of the venturi air pressure value P2 in the figure are obtained through calculation. In fig. 1, the air pressure data in the D pipe is the boost pressure air pressure value P3 generated by the turbocharger, and the air pressure data in the E pipe is the pre-turbo pressure value P4. In the specific implementation process, the calculation and the processing of data are completed through an engine controller ECU, after the closing of a carbon tank valve is ensured, under each steady-state working condition, P_cut data serving as calibration data are adjusted through INCA, so that P1 and P2 are basically equal, and then the air pressure value P2 in the venturi tube is obtained through P4-P_cut.
The OBD system is a vehicle-mounted computer system, and is equipped with a desorption flow diagnosis device 10, and the desorption flow diagnosis device 10 includes a control module 100, a judgment module 200, a fault confirmation module 300, and a fault type identification module 400, as shown in fig. 2, for a high-load pipeline of the evaporation system. Wherein the control module 100 is configured to control opening of the carbon canister valve; the judging module 200 is used for judging whether the difference between the air pressure values after the carbon tank valve is opened and before the carbon tank valve is opened is larger than a preset first air pressure threshold value; the fault confirmation module 300 is configured to confirm a fault state according to whether a difference between the air pressure values after and before the carbon canister valve is opened is greater than the first air pressure threshold; the fault type identification module 400 is configured to identify a specific fault type according to whether a difference between a real-time air pressure value in the high-load desorption pipeline and a real-time air pressure value in the venturi tube is greater than a preset second air pressure threshold value, and whether the duration is greater than a preset first time threshold value.
In some preferred embodiments, the desorption flow diagnostic device 10 further includes a counting module 500, the counting module 500 being configured to count the number of occurrences of events including: the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than a preset second air pressure threshold value, and the duration time is larger than a preset first time threshold value; the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is not more than a second air pressure threshold value; the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than the second air pressure threshold value but the duration is not larger than the first time threshold value.
Further, the foregoing event further includes: the difference between the air pressure values after and before the opening of the carbon canister valve is greater than a first air pressure threshold.
For diagnosis by the aforementioned evaporation system, the desorption flow diagnosis device 10 further includes a data acquisition module for acquiring air pressure data and time data in the evaporation system. The barometric pressure data includes a barometric pressure value P1, a boost pressure barometric pressure value P3, and a pre-turbo pressure value P4 in the C-tube as shown in fig. 1. The time data is the time when each air pressure is in the corresponding pressure value state.
In the specific implementation process, the calculation and the processing of data are completed through an engine controller ECU, after the closing of a carbon tank valve is ensured, under each steady-state working condition, P_cut data serving as calibration data are adjusted through INCA, so that P1 and P2 are basically equal, and then the air pressure value P2 in the venturi tube is obtained through P4-P_cut.
In some preferred embodiments, the desorption flow diagnostic device further includes a condition diagnostic module for diagnosing physical conditions and working conditions of the vehicle evaporation system and acquiring status data of the high-load desorption line. Physical conditions include engine temperature, ambient temperature, battery voltage, altitude, and canister flush closed loop control activation, and engine temperature. The ambient temperature, the battery voltage and the altitude can be diagnosed by setting a sensor when the method is specifically implemented, and the diagnosis can be realized by verifying the state instruction of the corresponding device by activating the closed loop control of the carbon tank flushing. The working conditions comprise an engine speed range, an engine load range, a gas mixture self-learning value, a carbon tank flushing accumulated integral and a vacuum degree. The related working conditions can be used for diagnosis by generating data through sensors, circuits and the like of the vehicle; wherein the vacuum degree is calculated in such a manner that the vacuum degree value Pv is equal to the difference between the atmospheric pressure value Pu and the venturi internal pressure value P2.
Based on the desorption flow diagnosis device, the invention discloses a desorption flow diagnosis method of a high-load pipeline, which is applied to a vehicle evaporation system, is used for diagnosis by actively controlling the working condition of an engine to the diagnosis working condition, and is applicable to a hybrid electric vehicle. The carbon tank valve mentioned in the method is shown in fig. 1, and the real-time air pressure in the high-load desorption pipeline refers to the air pressure which can be obtained by the pressure sensor of the high-load desorption pipeline in fig. 1, and the real-time air pressure in the venturi refers to the air pressure value in the venturi in fig. 1.
When the method is implemented, whether the physical condition and the working condition of the evaporation system are met or not is diagnosed. Wherein the physical conditions include engine temperature, ambient temperature, battery voltage, altitude, and canister flush closed loop control activation, and engine temperature. The ambient temperature, the battery voltage and the altitude can be diagnosed by setting a sensor when the method is specifically implemented, and the diagnosis can be realized by verifying the state instruction of the corresponding device by activating the closed loop control of the carbon tank flushing. The working conditions comprise an engine speed range, an engine load range, a gas mixture self-learning value, a carbon tank flushing accumulated integral and a vacuum degree. The related working conditions can be used for diagnosis by the data generated by the sensors and circuits and the like of the vehicle.
As shown in fig. 3, the method comprises the following steps:
a method for diagnosing desorption flow of a high-load pipeline, comprising:
s10, controlling the carbon tank valve to be opened.
Referring to fig. 1, when the canister valve is opened, the air pressure state of the piping of the evaporation system is affected, thereby facilitating diagnosis by the air pressure state in the piping. The carbon tank valve is in a closed state before and after the open state. Multiple sets of corresponding diagnostic data may be generated by multiple turns on and off.
For example, the canister valve is cycled on and off, and there is a continuous change and behavior of the corresponding air pressure conditions. Meanwhile, in some implementation cases, the purpose of obtaining accurate changes can be achieved by controlling the opening and closing time.
And S20, judging whether the difference between the air pressure value after the carbon tank valve is opened and the air pressure value before the carbon tank valve is opened is larger than a preset first air pressure threshold value.
For example, the pressure change condition of the carbon tank valve before and after opening is used for judging whether the pipeline of the whole evaporation device has faults, and specifically, the judgment is quantitatively realized by comparing the difference between the pressure values after opening and before opening with a preset first pressure threshold value.
And S30, when the difference between the air pressure value after the carbon tank valve is opened and the air pressure value before the carbon tank valve is opened is not more than the first air pressure threshold value, further judging whether the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is more than a preset second air pressure threshold value or not.
In this scheme, two links need to be passed through to the judgement of trouble, and in this step, in advance in the first link to the carbon tank valve open after with open the difference of atmospheric pressure value be greater than first atmospheric pressure threshold value has judged, only the carbon tank valve open after with open before the atmospheric pressure value difference be greater than first atmospheric pressure threshold value can follow-up entering first judgement link.
In some embodiments, the method further comprises determining that the canister valve is normal when the difference between the air pressure value after opening and the air pressure value before opening is greater than the first air pressure threshold.
Therefore, the qualification of whether the fault is completed in step S30, specifically, by the fault confirmation module 300.
And S40, judging that the carbon tank valve is stuck normally open or the high-load desorption pipeline is disconnected when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than a preset second air pressure threshold value and the duration time is larger than a preset first time threshold value.
In the step, a second link of judgment is entered for specifically judging the type of the fault. That is, only when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than a preset second air pressure threshold value and the duration time is larger than a preset first time threshold value, the carbon tank valve is judged to be stuck normally open or the high-load desorption pipeline is judged to be disconnected.
In the specific fault type determination, the fault type is identified by the fault type identification module 400.
In other embodiments, when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is not greater than the second air pressure threshold, or the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is greater than the second air pressure threshold, but the duration is not greater than the first time threshold, the carbon tank valve is judged to be stuck normally closed or the high-load desorption pipeline is judged to be blocked.
In particular, in order to ensure the reliability of diagnosis, the number of times of occurrence of the air pressure comparison and the time comparison in the above steps may be introduced to make a judgment.
In some preferred embodiments, the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is greater than a preset second air pressure threshold value, the duration is greater than a preset first time threshold value, and when at least one occurrence occurs, the carbon tank valve is judged to be stuck normally open or the high-load desorption pipeline is judged to be disconnected.
In some preferred embodiments, when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is not greater than the second air pressure threshold value at least once, the carbon tank valve is judged to be stuck normally closed or the high-load desorption pipeline is judged to be blocked.
In some preferred embodiments, when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is greater than the second air pressure threshold value but the duration is not greater than the first time threshold value at least once, the carbon tank valve is judged to be stuck normally closed or the high-load desorption pipeline is judged to be blocked.
In the above embodiments, the occurrence of at least one time means that a plurality of comparisons are performed during the judgment, and the occurrence of the event is limited to the lowest occurrence. And in the specific implementation, three times, five times, nine times and the like can be defined as judgment standards.
In order to more clearly illustrate this aspect, a number of specific embodiments are set forth below for further illustration.
S1, controlling the carbon tank to be opened;
s2, based on the fact that the air pressure value of the air pressure in the high-load desorption pipeline before the carbon tank valve is opened is P10, the air pressure value after the opening is P11, the P10 is subtracted from the P11 to serve as an air pressure change value dP, and if the air pressure change value dP is larger than a first air pressure threshold Y, the high-load desorption pipeline is judged to be normal; and if the pressure change value dP is smaller than or equal to the first pressure threshold Y, judging that the high-load desorption pipeline is faulty.
Further, in step S1, the canister is controlled to be opened for multiple times, and a closing operation is performed between each opening operation, and in step S2, a plurality of air pressure variation values dP are correspondingly generated, and if the variation values dP are all greater than the first air pressure threshold value Y, it is judged that the high-load desorption pipeline is normal; and if the air pressure change values dP are smaller than or equal to the first air pressure threshold Y, judging that the high-load desorption pipeline is faulty. The case where the number of times is the smallest is one.
Thus, further, in one embodiment, referring to FIG. 5, the method comprises the steps of:
s3, based on the real-time air pressure value P1 in the high-load desorption pipeline and the real-time air pressure value P2 in the venturi tube, subtracting P1 from the real-time air pressure value P2 to serve as a vacuum degree value error P delta, and judging that the carbon tank valve is blocked and normally opened or the high-load desorption pipeline is disconnected if the vacuum degree value error P delta is larger than a preset second air pressure threshold Z. By the method, the specific type of the fault is normally open due to clamping stagnation of the carbon tank valve or disconnection of the high-load desorption pipeline.
Further, introducing a vacuum degree value error Pdelta larger than a preset second air pressure threshold Z state duration time T1 as a judgment basis, and judging that the carbon tank valve is stuck normally open or a high-load desorption pipeline is disconnected if the duration time T1 is larger than a preset first time threshold T.
Further, introducing the number of times that the vacuum degree value error P delta is larger than the preset second air pressure threshold Z as a judgment basis, and then subtracting P1 from the real-time air pressure value P1 in the high-load desorption pipeline and the real-time air pressure value P2 in the venturi tube as the vacuum degree value error P delta, wherein the number of times that the vacuum degree value error P delta is larger than the preset second air pressure threshold Z is at least one, and the duration time T1 is larger than the preset first time threshold T each time, judging that the carbon tank valve is stuck normally open or the high-load desorption pipeline is disconnected.
Thus, further, in one embodiment, referring to FIG. 6, the method comprises the steps of:
s3', subtracting P1 from the real-time air pressure value P1 in the high-load desorption pipeline and the real-time air pressure value P2 in the venturi tube to serve as a vacuum degree value error P delta, and judging that the carbon tank valve is blocked and normally closed or the high-load desorption pipeline is blocked if the vacuum degree value error P delta is smaller than or equal to a preset second air pressure threshold Z.
Further, introducing the number of times that the vacuum degree value error P delta is smaller than or equal to the preset second air pressure threshold Z as a judgment basis, wherein the real-time air pressure value P1 in the high-load desorption pipeline and the real-time air pressure value P2 in the venturi tube minus P1 are used as the vacuum degree value error P delta, and the number of times that the vacuum degree value error P delta is smaller than or equal to the preset second air pressure threshold Z is at least one, and judging that the carbon tank valve is stuck normally closed or the high-load desorption pipeline is blocked.
Further, the duration of the introduction state is taken as a judging basis, the real-time air pressure value P1 in the high-load desorption pipeline and the real-time air pressure value P2 in the venturi tube are taken as vacuum degree value errors P delta, the difference of the vacuum degree value errors P delta is at least once larger than the occurrence frequency of the preset second air pressure threshold Z, and the duration time T1 of each time is smaller than the preset first time threshold T, so that the carbon tank valve is judged to be blocked normally or the high-load desorption pipeline is judged to be blocked.
In specific implementation, the above embodiments and examples may be combined with each other. In actual diagnosis, the corresponding signal results are shown in fig. 7 and 8.
A non-transitory computer readable storage medium storing computer instructions for causing the computer to perform the aforementioned desorption flow diagnostic method.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. A method for diagnosing desorption flow of a high-load pipeline, comprising:
controlling the carbon tank valve to be opened;
judging whether the difference between the air pressure value after the carbon tank valve is opened and the air pressure value before the carbon tank valve is opened is larger than a preset first air pressure threshold value;
when the difference between the air pressure value after the carbon tank valve is opened and the air pressure value before the carbon tank valve is opened is not more than the first air pressure threshold value, further judging whether the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is more than a preset second air pressure threshold value or not;
and when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than a preset second air pressure threshold value and the duration time is larger than a preset first time threshold value, judging that the carbon tank valve is stuck normally open or the high-load desorption pipeline is disconnected.
2. The method for diagnosing a desorption flow of a high-load line according to claim 1, wherein said step of determining whether the difference between the real-time air pressure value in the high-load desorption line and the real-time air pressure value in the venturi is greater than said second air pressure threshold value comprises:
and when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is not more than the second air pressure threshold value, or the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is more than the second air pressure threshold value but the duration time is not more than the first time threshold value, judging that the carbon tank valve is stuck normally closed or the high-load desorption pipeline is blocked.
3. A method of diagnosing a desorption flow of a high load line according to claim 1, wherein:
and when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than a preset second air pressure threshold value and the duration time is larger than a preset first time threshold value at least once, judging that the carbon tank valve is stuck normally open or the high-load desorption pipeline is disconnected.
4. A method of diagnosing a desorption flow of a high load line according to claim 2, wherein:
and when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is not larger than the second air pressure threshold value at least once, judging that the carbon tank valve is blocked normally or the high-load desorption pipeline is blocked.
5. A method of diagnosing a desorption flow of a high load line according to claim 2, wherein:
and when the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than the second air pressure threshold value but the duration is not longer than the first time threshold value at least once, judging that the carbon tank valve is stuck normally closed or the high-load desorption pipeline is blocked.
6. A method of diagnosing a desorption flow of a high load line according to any one of claims 1 to 5, wherein:
and judging that the carbon tank valve is normal when the difference between the air pressure value after the carbon tank valve is opened and the air pressure value before the carbon tank valve is opened is larger than the first air pressure threshold value.
7. A desorption flow diagnostic device, comprising:
the control module is used for controlling the opening of the carbon tank valve;
the judging module is used for judging whether the difference between the air pressure values after the carbon tank valve is opened and before the carbon tank valve is opened is larger than a preset first air pressure threshold value;
the fault confirming module is used for confirming a fault state according to whether the difference between the air pressure values after the carbon tank valve is opened and before the carbon tank valve is opened is larger than the first air pressure threshold value;
the fault type identification module is used for identifying a specific fault type according to whether the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than a preset second air pressure threshold value or not and whether the duration time is larger than a preset first time threshold value or not.
8. The desorption flow diagnostic device of claim 7, further comprising:
the counting module is used for calculating the occurrence times of the events, and the events comprise:
the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than a preset second air pressure threshold value, and the duration time is larger than a preset first time threshold value;
the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is not more than the second air pressure threshold value;
the difference between the real-time air pressure value in the high-load desorption pipeline and the real-time air pressure value in the venturi tube is larger than the second air pressure threshold value but the duration is not larger than the first time threshold value.
9. A desorption flow diagnostic device as set forth in claim 8, wherein said event further includes:
the difference between the air pressure value after and before the opening of the carbon tank valve is greater than the first air pressure threshold.
10. A non-transitory computer readable storage medium storing computer instructions for causing the computer to perform the desorption flow diagnostic method of any one of the preceding claims 1-6.
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