CN112412667B - Low desorption pipeline diagnosis method, diagnosis terminal, vehicle and storage medium - Google Patents
Low desorption pipeline diagnosis method, diagnosis terminal, vehicle and storage medium Download PDFInfo
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- CN112412667B CN112412667B CN202011421153.5A CN202011421153A CN112412667B CN 112412667 B CN112412667 B CN 112412667B CN 202011421153 A CN202011421153 A CN 202011421153A CN 112412667 B CN112412667 B CN 112412667B
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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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Abstract
The invention discloses a diagnosis method, a diagnosis terminal and a storage medium of a low desorption pipeline, wherein the method comprises the following steps: acquiring working parameters of a vehicle; judging whether a diagnosis boundary condition is met or not according to the working parameters; when the diagnosis boundary condition is met, controlling an electromagnetic valve on the low desorption pipeline to be opened at a preset opening value; acquiring voltage change values of a front oxygen sensor on an engine exhaust pipe before and after the electromagnetic valve is opened; judging whether the voltage change value of the front oxygen sensor is greater than or equal to a preset change threshold value or not; if so, determining that the low desorption pipeline has no fault; and if not, determining that the low desorption pipeline has a fault. The method solves the problem that the accuracy of the diagnosis result is reduced due to the fact that the existing scheme for diagnosing the low desorption pipeline through the pressure change of the intake manifold when the carbon tank solenoid valve is opened is easily influenced by other factors.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a low desorption pipeline diagnosis method, a diagnosis terminal, a vehicle and a computer readable storage medium.
Background
The low desorption pipeline system is a system commonly used on a natural suction engine, can transmit oil-gas mixed gas absorbed by a carbon tank to an air inlet manifold to participate in combustion in a cylinder, and prevents the carbon tank from being damaged due to oil-gas saturation and preventing oil gas from leaking into atmosphere and other hazards, so that the low desorption pipeline system is particularly important for diagnosis of a low-load desorption pipeline.
In the prior art, whether leakage exists in a low desorption pipeline is judged according to the pressure change of an air inlet manifold when a carbon tank electromagnetic valve is opened. Many factors can cause changes in intake manifold pressure during actual travel. Such as the non-human actively controlled opening and closing of an air conditioner, the opening and closing of a blower, etc., which require corresponding action by a throttle valve, which in turn can cause changes in intake manifold pressure. Thereby affecting the result of the judgment and even causing false alarm failure.
Disclosure of Invention
The invention mainly aims to provide a low desorption pipeline diagnosis method, a diagnosis terminal, a vehicle and a computer readable storage medium, and aims to solve the problem that the accuracy of a diagnosis result is reduced due to the fact that the existing scheme for diagnosing the low desorption pipeline through the pressure change of an intake manifold when a carbon tank solenoid valve is opened is easily influenced by other factors.
In order to achieve the above object, the present invention provides a method for diagnosing a low desorption pipeline, comprising the steps of:
acquiring working parameters of a vehicle;
judging whether a diagnosis boundary condition is met or not according to the working parameters;
when the diagnosis boundary condition is met, controlling an electromagnetic valve on the low desorption pipeline to be opened at a preset opening value;
acquiring voltage change values of a front oxygen sensor on an engine exhaust pipe before and after the electromagnetic valve is opened;
judging whether the voltage change value of the front oxygen sensor is greater than or equal to a preset change threshold value or not;
if so, determining that the low desorption pipeline has no fault;
and if not, determining that the low desorption pipeline has a fault.
Optionally, the operating parameters include an engine water temperature, an engine operating condition, a carbon canister concentration, an opening degree of an electromagnetic valve, and an electromagnetic valve state, and the step of determining whether the diagnostic boundary condition is satisfied according to the operating parameters includes:
judging whether the water temperature of the engine is greater than or equal to a preset temperature threshold, whether the working condition of the engine is a deceleration fuel cut-off working condition, whether the concentration of the carbon tank is greater than or equal to a preset concentration threshold, whether the opening of the electromagnetic valve is 0 and whether the electromagnetic valve is normal;
and if the water temperature of the engine is greater than or equal to the preset temperature threshold value, the working condition of the engine is a deceleration fuel cut-off working condition, the concentration of the carbon tank is greater than or equal to the preset concentration threshold value, the opening of the electromagnetic valve is 0 and the electromagnetic valve is normal, determining that the diagnosis boundary condition is met.
Optionally, when the diagnostic boundary condition is satisfied, the step of controlling the solenoid valve on the low desorption pipeline to open at a preset opening value includes:
when the diagnosis boundary condition is met, controlling the electromagnetic valve to open for a preset time at a preset opening value;
acquiring voltage change values of the front oxygen sensor before and after the electromagnetic valve is opened;
acquiring a first voltage value of the front oxygen sensor before the electromagnetic valve is opened and a second voltage value of the front oxygen sensor when the electromagnetic valve is opened for a preset time at a preset opening value;
and taking the difference value of the first voltage value and the second voltage value as the voltage change value of the front oxygen sensor before and after the electromagnetic valve is opened.
Optionally, the step of determining that the low desorption pipeline has a fault further comprises:
adding 1 to the abnormal cumulative frequency, and judging whether the abnormal cumulative frequency reaches a first preset frequency;
and when the abnormal accumulation frequency reaches a first preset frequency, determining that the low desorption pipeline has a fault, and resetting the abnormal accumulation frequency.
Optionally, the step of determining that the low desorption pipeline has a fault further comprises:
acquiring a pressure value of an intake manifold, and judging whether the pressure value is greater than a preset pressure threshold value;
if so, determining that the low desorption pipeline has leakage;
and if not, determining that the low desorption pipeline is blocked.
Optionally, the step of determining that the low desorption pipeline has a leak comprises:
adding 1 to the accumulated number of abnormal leakage, and judging whether the accumulated number of abnormal leakage reaches a second preset number;
when the abnormal accumulated times of leakage reach a second preset time, determining that the low desorption pipeline has leakage, and resetting the abnormal accumulated times of leakage and the abnormal accumulated times of blockage;
the step of determining that the low desorption pipeline is blocked comprises the following steps:
adding 1 to the accumulation frequency of the abnormal blockage, and judging whether the accumulation frequency of the abnormal blockage reaches a third preset frequency;
and when the blockage abnormal accumulation frequency reaches a third preset frequency, determining that the low desorption pipeline is blocked, and resetting the blockage abnormal accumulation frequency and the leakage abnormal accumulation frequency.
Optionally, after the step of determining that the low desorption pipeline has a fault, the method further includes:
and sending a fault alarm message and lightening a fault lamp of the engine.
In order to achieve the above object, the present invention further provides a diagnostic terminal comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the computer program, when executed by the processor, implements the steps of the diagnostic method for a low desorption line as described above.
To achieve the above object, the present invention also provides a vehicle including the diagnostic terminal as described above.
To achieve the above object, the present invention further provides a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, implements the steps of the method for diagnosing a low desorption line as described above.
According to the low desorption pipeline diagnosis method, the diagnosis terminal and the computer readable storage medium, the working parameters of the vehicle are obtained; judging whether a diagnosis boundary condition is met or not according to the working parameters; when the diagnosis boundary condition is met, controlling an electromagnetic valve on the low desorption pipeline to be opened at a preset opening value; acquiring voltage change values of a front oxygen sensor on an engine exhaust pipe before and after the electromagnetic valve is opened; judging whether the voltage change value of the front oxygen sensor is greater than or equal to a preset change threshold value or not; if so, determining that the low desorption pipeline has no fault; and if not, determining that the low desorption pipeline has a fault. Therefore, whether fuel oil enters the engine at the moment when the carbon tank electromagnetic valve is opened can be more directly monitored by monitoring the change of the air-fuel ratio through the oxygen sensor signal, and compared with the method that the pressure change of the air inlet manifold is used as a judgment standard, the method is not easy to be influenced by other factors, and whether the low-load desorption pipeline has the faults of disconnection and blockage can be more accurately judged.
Drawings
FIG. 1 is a schematic diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a method for diagnosing a low desorption pipeline according to the present invention;
FIG. 3 is a schematic flow chart of a second embodiment of the method for diagnosing a low desorption pipeline according to the present invention;
fig. 4 is a detailed flowchart of step S70 in the third embodiment of the diagnosis method for low desorption pipelines according to the present invention;
fig. 5 is a detailed flowchart of step S70 in the fourth embodiment of the diagnosis method for low desorption pipelines according to the present invention;
fig. 6 is a detailed flowchart of step S70 in the fifth embodiment of the diagnosis method for low desorption pipelines according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of a diagnostic terminal provided in various embodiments of the present invention. The diagnosis terminal comprises a communication module 01, a memory 02, a processor 03 and the like. Those skilled in the art will appreciate that the diagnostic terminal shown in fig. 1 may also include more or fewer components than shown, or combine certain components, or a different arrangement of components. The processor 03 is connected to the memory 02 and the communication module 01, respectively, and the memory 02 stores a computer program, which is executed by the processor 03 at the same time.
The communication module 01 may be connected to an external device through a network. The communication module 01 may receive data sent by an external device, and may also send data, instructions, and information to the external device, where the external device may be an electronic device such as a mobile phone, a tablet computer, a notebook computer, and a desktop computer.
The memory 02 may be used to store software programs and various data. The memory 02 may mainly include a stored program area and a stored data area, wherein the stored program area may store an operating system, an application program required by at least one function (obtaining a voltage change value of a front oxygen sensor on an engine exhaust pipe before and after the electromagnetic valve is opened), and the like; the storage data area may store data or information created according to the use of the diagnosis terminal, or the like. Further, the memory 02 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The processor 03, which is a control center of the diagnostic terminal, connects various parts of the entire diagnostic terminal using various interfaces and lines, and performs various functions of the diagnostic terminal and processes data by running or executing software programs and/or modules stored in the memory 02 and calling data stored in the memory 02, thereby performing overall monitoring of the diagnostic terminal. Processor 03 may include one or more processing units; preferably, the processor 03 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 03.
Although not shown in fig. 1, the diagnosis terminal may further include a circuit control module, where the circuit control module is used for being connected to a mains supply to implement power control and ensure normal operation of other components.
It will be appreciated by those skilled in the art that the diagnostic terminal configuration shown in fig. 1 does not constitute a limitation of the diagnostic terminal and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
Various embodiments of the method of the present invention are presented in terms of the above-described hardware architecture.
Referring to fig. 2, in a first embodiment of the method for diagnosing a low desorption line of the present invention, the method for diagnosing a low desorption line includes the steps of:
step S10, obtaining the working parameters of the vehicle;
in this scheme, the carbon tank in the vehicle is connected with the intake manifold through low desorption pipeline, and the solenoid valve sets up on low desorption pipeline, and the first output of diagnosis terminal links to each other with the control end of solenoid valve, and diagnosis terminal sends control signal to solenoid valve to control solenoid valve open or close, and then control carbon tank and intake manifold switch on or break off, and diagnosis terminal still can acquire the state of solenoid valve simultaneously, acquires whether the solenoid valve is in the fault condition or normal condition promptly. The exhaust pipe of the engine is provided with a front oxygen sensor, the output end of the front oxygen sensor is connected with the second input end of the diagnosis terminal, the front oxygen sensor is used for detecting the air-fuel ratio in the exhaust pipe and feeding back the air-fuel ratio to the diagnosis terminal through a voltage signal, and therefore the diagnosis terminal can obtain the voltage value of the front oxygen sensor. The diagnosis terminal can also obtain the oil gas concentration of the carbon tank and the water temperature of the engine.
Step S20, judging whether the diagnosis boundary condition is satisfied according to the working parameters;
the diagnosis terminal can obtain the water temperature of the engine, the working condition of the engine, the concentration of the carbon tank, the opening degree of the electromagnetic valve and the state of the electromagnetic valve in real time, judge whether the water temperature of the engine is larger than or equal to a preset temperature threshold value, whether the working condition of the engine is a deceleration fuel cut-off working condition, whether the concentration of the carbon tank is larger than or equal to a preset concentration threshold value, whether the opening degree of the electromagnetic valve is 0 and whether the electromagnetic valve is normal, and determine that the condition of the current vehicle meets the diagnosis boundary condition if the water temperature of the engine is larger than or equal to the preset temperature threshold value, the working condition of the engine is the deceleration fuel cut-off working condition, the concentration of the carbon tank is larger than or equal to the preset concentration threshold value, the opening degree of the electromagnetic valve is 0 and the electromagnetic valve is normal. If the water temperature of the engine is smaller than the preset temperature threshold value, the working condition of the engine is not the deceleration fuel cut-off working condition, the concentration of the carbon tank is smaller than the preset concentration threshold value, the opening degree of the electromagnetic valve is not 0, and the electromagnetic valve is abnormal, the diagnosis terminal can determine that the diagnosis boundary condition is not met.
It should be noted that the diagnostic terminal may further obtain the external atmospheric pressure, and use the atmospheric pressure as a determination condition in the diagnostic boundary conditions, that is, determine whether the atmospheric pressure is greater than or equal to a preset pressure threshold, and determine that the current vehicle condition meets the diagnostic boundary conditions when the engine water temperature is greater than or equal to the preset temperature threshold, the engine operating condition is a deceleration fuel cut-off operating condition, the canister concentration is greater than or equal to the preset concentration threshold, the opening of the electromagnetic valve is 0, the electromagnetic valve is normal, and the atmospheric pressure is greater than or equal to the preset pressure threshold.
Step S30, when the diagnosis boundary condition is met, controlling the electromagnetic valve on the low desorption pipeline to be opened by a preset opening value;
step S40, acquiring voltage change values of a front oxygen sensor on an engine exhaust pipe before and after the electromagnetic valve is opened;
when the diagnosis terminal determines that the current vehicle condition meets the diagnosis boundary condition, the electromagnetic valve is controlled to be opened by a preset opening value, the preset opening value is preset, and one optimal value of the preset opening value is 70%.
The diagnosis terminal can acquire the voltage value of the oxygen sensor before the electromagnetic valve is opened and the voltage value of the oxygen sensor after a preset opening value is opened, and then the difference value of the voltage value and the voltage value is used as the voltage change value of the oxygen sensor before and after the electromagnetic valve is opened.
Step S50, judging whether the voltage change value of the front oxygen sensor is larger than or equal to a preset change threshold value; if yes, go to step S60; if not, go to step S70;
step S60, determining that the low desorption pipeline has no fault;
and step S70, determining that the low desorption pipeline has a fault.
After the voltage change value is obtained, the diagnosis terminal can judge whether the voltage change value is larger than or equal to a preset change threshold value, when the voltage change value is larger than or equal to the preset change threshold value, the diagnosis terminal can determine that the low desorption pipeline has no fault, and when the voltage change value is smaller than the preset change threshold value, the diagnosis terminal can determine that the low desorption pipeline has the fault. When the diagnosis terminal determines that the low desorption pipeline has a fault, the diagnosis terminal is also connected with the combination instrument through the CAN bus and sends a fault alarm message to the combination instrument, so that the combination instrument displays and/or broadcasts fault information through voice according to the fault alarm message, and meanwhile, an engine fault lamp is controlled to be turned on.
It should be noted that after the diagnostic terminal determines whether the low desorption pipeline has a fault, the solenoid valve is closed again, that is, the opening of the solenoid valve is controlled to be 0.
The embodiment obtains the working parameters of the vehicle; judging whether a diagnosis boundary condition is met or not according to the working parameters; when the diagnosis boundary condition is met, controlling an electromagnetic valve on the low desorption pipeline to be opened at a preset opening value; acquiring voltage change values of a front oxygen sensor on an engine exhaust pipe before and after the electromagnetic valve is opened; judging whether the voltage change value of the front oxygen sensor is greater than or equal to a preset change threshold value or not; if so, determining that the low desorption pipeline has no fault; and if not, determining that the low desorption pipeline has a fault. Therefore, whether fuel oil enters the engine at the moment when the carbon tank electromagnetic valve is opened can be more directly monitored by monitoring the change of the air-fuel ratio through the oxygen sensor signal, and compared with the method that the pressure change of the air inlet manifold is used as a judgment standard, the method is not easy to be influenced by other factors, and whether the low-load desorption pipeline has the faults of disconnection and blockage can be more accurately judged.
Further, referring to fig. 3, fig. 3 is a diagram illustrating a second embodiment of the low desorption pipeline diagnostic method according to the first embodiment of the present application, in which step S30 includes:
step S31, when the diagnosis boundary condition is satisfied, controlling the electromagnetic valve to open for a preset time at a preset opening value;
step S40 includes:
step S41, acquiring a first voltage value of the front oxygen sensor before the electromagnetic valve is opened and a second voltage value of the front oxygen sensor when the electromagnetic valve is opened for a preset time at a preset opening value;
in step S42, the difference between the first voltage value and the second voltage value is used as the voltage change value of the front oxygen sensor before and after the solenoid valve is opened.
In this embodiment, when the diagnostic terminal determines that the diagnostic boundary condition is satisfied, the solenoid valve is controlled to open for a preset time with a preset opening value, where the preset time may be 1s, 2s, or 3s, and preferably 2s, where the preset time is not limited, and then the diagnostic terminal obtains a first voltage value of the front oxygen sensor before the solenoid valve opens and a second voltage value of the front oxygen sensor when the solenoid valve opens for the preset time with the preset opening value, and then uses a difference between the first voltage value and the second voltage value, where the difference is an absolute difference, as a voltage change value of the front oxygen sensor before and after the solenoid valve opens. And then the diagnosis terminal judges whether the low desorption pipeline has faults or not by taking the voltage change value as a judgment standard.
Because the low desorption pipeline has certain length, the fuel steam in the carbon tank needs certain time after the solenoid valve opens, and the voltage value of preceding oxygen sensor is stable also needs certain time, so this embodiment is through opening the solenoid valve after certain time, reachs the voltage variation value of preceding oxygen sensor to avoid the fuel steam that reachs the engine not stable, lead to the judgement result error, improve the accuracy of judging the fault result.
Further, referring to fig. 4, fig. 4 is a diagram illustrating a third embodiment of the low desorption pipeline diagnostic method according to the first and second embodiments of the present application, wherein in this embodiment, step S70 includes:
step S71, adding 1 to the abnormal cumulative frequency and judging whether the abnormal cumulative frequency reaches a first preset frequency;
and step S72, when the abnormal accumulated times reach a first preset time, determining that the low desorption pipeline has a fault.
In the embodiment, a parameter of the abnormal accumulation frequency is set by the diagnosis terminal, when the diagnosis terminal determines that the voltage variation value of the oxygen sensor before and after the electromagnetic valve is opened is smaller than a preset variation threshold value in the process of diagnosing the low desorption pipeline once, the abnormal accumulation frequency is added by 1, then whether the abnormal accumulation frequency reaches a first preset frequency is judged, the first preset frequency is any integer value larger than 1, preferably 3, when the first preset frequency is reached, the diagnosis terminal determines that the low desorption pipeline has a fault and clears the abnormal accumulation frequency, and when the first preset frequency is not reached, the diagnosis terminal determines that the low desorption pipeline has no fault.
It should be noted that, the diagnosis terminal further sets a parameter of the normal cumulative number, and step S60 includes: when the diagnosis terminal determines that the voltage change value of the oxygen sensor before and after the electromagnetic valve is opened is larger than or equal to a preset change threshold value, the low desorption pipeline is determined to have no fault, the parameter of the normal accumulation frequency is added by 1, then whether the normal accumulation frequency reaches a first preset frequency or not is judged, and when the first preset frequency is reached, the normal accumulation frequency and the abnormal accumulation frequency are reset; in step S72, when the abnormal cumulative count reaches the first preset count, it is determined that the low desorption pipeline has a fault, and the normal cumulative count is also cleared in addition to the clearing of the abnormal cumulative count.
In this embodiment, the result of the first judgment is not taken as the final fault judgment result, but the judgment results of the previous times and the judgment result of the current time are integrated to determine the final fault judgment result, so that the error caused by the result of the first judgment is avoided, and the accuracy of the fault judgment is improved.
Further, referring to fig. 5, fig. 5 is a fourth embodiment of the low desorption pipeline diagnostic method according to the first and second embodiments of the present application, and in this embodiment, step S70 further includes:
step S73, acquiring a pressure value of the intake manifold, and judging whether the pressure value is greater than a preset pressure threshold value;
if yes, go to step S74; if not, go to step S75;
step S74, determining that the low desorption pipeline has leakage;
and step S75, determining that the low desorption pipeline is blocked.
In this embodiment, the fault of low desorption pipeline includes two kinds of faults of revealing and blockking up, and the diagnostic terminal has still preset the pressure threshold value of an air intake manifold, can open the pressure value of back air intake manifold and air intake manifold's pressure threshold value through the solenoid valve with the preset aperture threshold value and carry out the comparison to further judge the fault type of low desorption pipeline. Specifically, when the diagnosis terminal determines that the voltage change value of the pre-oxygen sensor before and after the electromagnetic valve is opened is smaller than a preset change threshold value, the pressure value of the intake manifold after the electromagnetic valve is opened by the preset opening threshold value is obtained, whether the pressure value is larger than the preset pressure value or not is judged, if the pressure value of the intake manifold is larger than the preset pressure value at the moment, it is determined that the low desorption pipeline has a fault and the fault type is leakage, and if the pressure value of the intake manifold is smaller than the preset pressure value at the moment, it is determined that the low desorption pipeline has a fault and the fault type is blockage.
According to the embodiment, the fault type of the low desorption pipeline is further refined and judged by combining the change of the front oxygen sensor before and after the electromagnetic valve is opened and the pressure value of the air inlet manifold after the electromagnetic valve is opened.
Further, referring to fig. 6, fig. 6 is a fifth embodiment of the diagnostic method for a low desorption pipeline according to the foregoing embodiment of the diagnostic method for a low desorption pipeline of the present application, and in this embodiment, the step S74 further includes:
step S741, adding 1 to the accumulated leakage anomaly frequency, and judging whether the accumulated leakage anomaly frequency reaches a second preset frequency;
step S742, when the abnormal accumulated number of leakage reaches a second preset number, determining that the low desorption pipeline has leakage, and resetting the abnormal accumulated number of leakage and the abnormal accumulated number of blockage;
step S75 includes:
step S751, adding 1 to the accumulation frequency of the blockage abnormity, and judging whether the accumulation frequency of the blockage abnormity reaches a third preset frequency;
and step S752, when the blockage abnormal accumulation frequency reaches a third preset frequency, determining that the low desorption pipeline is blocked, and resetting the blockage abnormal accumulation frequency and the leakage abnormal accumulation frequency.
The diagnosis terminal of the embodiment sets the parameter of the number of accumulation of leakage abnormality and the parameter of the time of accumulation of clogging abnormality, when the diagnosis terminal determines that the voltage change value of the oxygen sensor before and after the electromagnetic valve is opened is smaller than the preset change threshold value in the process of one-time low desorption pipeline diagnosis, and when the pressure value of the intake manifold is greater than the preset pressure threshold after the electromagnetic valve is opened by the preset opening threshold, the accumulated number of abnormal leakage is added by 1, and then determining whether the cumulative number of abnormal leaks reaches a second preset number, where the second preset number is any integer value greater than 1, preferably 3, when reaching the second preset times, the diagnosis terminal can determine that the low desorption pipeline has leakage fault, and clearing the leakage abnormal accumulation frequency and the blockage abnormal accumulation frequency, wherein when the leakage abnormal accumulation frequency and the blockage abnormal accumulation frequency do not reach a second preset frequency, the diagnosis terminal can determine that the low-desorption pipeline has no fault.
Similarly, the diagnosis terminal determines that the voltage change value of the front oxygen sensor before and after the electromagnetic valve is opened is smaller than a preset change threshold, and when the pressure value of the air manifold after the electromagnetic valve is opened by the preset opening threshold is smaller than or equal to the preset pressure threshold, the accumulated times of abnormal blockage is added with 1, then whether the accumulated times of abnormal blockage reaches a third preset time is judged, the third preset time is any integer value larger than 1, preferably 3, when the third preset time is reached, the diagnosis terminal determines that the low desorption pipeline has the blockage fault, and clears the accumulated times of abnormal blockage and the accumulated times of abnormal leakage to zero, and when the third preset time is not reached, the diagnosis terminal determines that the low desorption pipeline has no fault.
It should be noted that, the diagnosis terminal further sets a parameter of the normal cumulative number, and step S60 includes: when the diagnosis terminal determines that the voltage change value of the oxygen sensor before and after the electromagnetic valve is opened is larger than or equal to a preset change threshold value, the low desorption pipeline is determined to have no fault, the parameter of the normal accumulation frequency is added by 1, then whether the normal accumulation frequency reaches a first preset frequency or not is judged, and when the normal accumulation frequency, the abnormal accumulation frequency and the leakage abnormal accumulation frequency are cleared when the first preset frequency is reached; in step S742, when the abnormal leakage accumulation frequency reaches a second preset frequency, it is determined that the low desorption pipeline has a leakage fault, and the normal accumulation frequency, the abnormal accumulation frequency, and the abnormal leakage accumulation frequency are cleared at the same time. In step S752, when the number of times of abnormal blockage accumulation reaches a third preset number, it is determined that a blockage fault exists in the low desorption pipeline, and the number of times of normal accumulation, the number of times of abnormal accumulation, and the number of times of abnormal leakage accumulation are cleared at the same time.
In this embodiment, the result of the first judgment is not taken as the final fault judgment result, but the judgment results of the previous times and the judgment result of the current time are integrated to determine the final fault judgment result, so that the error caused by the result of the first judgment is avoided, and the accuracy of the fault judgment is improved.
The invention also proposes a vehicle comprising a diagnostic terminal implementing the method according to the various embodiments of the invention.
The invention also proposes a computer-readable storage medium on which a computer program is stored. The computer-readable storage medium may be the Memory 02 in the diagnostic terminal of fig. 1, and may also be at least one of a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, and an optical disk, and the computer-readable storage medium includes several pieces of information for enabling the diagnostic terminal to perform the method according to the embodiments of the present invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A method of diagnosing a low desorption line, comprising the steps of:
acquiring working parameters of a vehicle;
judging whether a diagnosis boundary condition is met or not according to the working parameters;
when the diagnosis boundary condition is met, controlling an electromagnetic valve on the low desorption pipeline to be opened at a preset opening value;
acquiring voltage change values of a front oxygen sensor on an engine exhaust pipe before and after the electromagnetic valve is opened;
judging whether the voltage change value of the front oxygen sensor is greater than or equal to a preset change threshold value or not;
if so, determining that the low desorption pipeline has no fault;
if not, determining that the low desorption pipeline has a fault;
the step of determining that the low desorption pipeline has a fault further comprises:
acquiring a pressure value of an intake manifold, and judging whether the pressure value is greater than a preset pressure threshold value;
if so, determining that the low desorption pipeline has leakage;
and if not, determining that the low desorption pipeline is blocked.
2. The method for diagnosing the low desorption pipeline according to claim 1, wherein the working parameters comprise an engine water temperature, an engine working condition, a carbon tank concentration, an opening degree of an electromagnetic valve and an electromagnetic valve state, and the step of judging whether the diagnosis boundary condition is met according to the working parameters comprises the steps of:
judging whether the water temperature of the engine is greater than or equal to a preset temperature threshold, whether the working condition of the engine is a deceleration fuel cut-off working condition, whether the concentration of the carbon tank is greater than or equal to a preset concentration threshold, whether the opening of the electromagnetic valve is 0 and whether the electromagnetic valve is normal;
and if the water temperature of the engine is greater than or equal to the preset temperature threshold value, the working condition of the engine is a deceleration fuel cut-off working condition, the concentration of the carbon tank is greater than or equal to the preset concentration threshold value, the opening of the electromagnetic valve is 0 and the electromagnetic valve is normal, determining that the diagnosis boundary condition is met.
3. The method for diagnosing the low desorption pipeline according to claim 2, wherein the step of controlling the solenoid valve on the low desorption pipeline to be opened at a preset opening value when the diagnosis boundary condition is met comprises the following steps:
when the diagnosis boundary condition is met, controlling the electromagnetic valve to open for a preset time at a preset opening value;
acquiring voltage change values of the front oxygen sensor before and after the electromagnetic valve is opened;
acquiring a first voltage value of the front oxygen sensor before the electromagnetic valve is opened and a second voltage value of the front oxygen sensor when the electromagnetic valve is opened for a preset time at a preset opening value;
and taking the difference value of the first voltage value and the second voltage value as the voltage change value of the front oxygen sensor before and after the electromagnetic valve is opened.
4. The method for diagnosing a low desorption line according to any one of claims 1 to 3, wherein the step of determining that the low desorption line is faulty further comprises:
adding 1 to the abnormal cumulative frequency, and judging whether the abnormal cumulative frequency reaches a first preset frequency;
and when the abnormal accumulation frequency reaches a first preset frequency, determining that the low desorption pipeline has a fault, and resetting the abnormal accumulation frequency.
5. The method of claim 1, wherein the step of determining that a leak exists in the low desorption line comprises:
adding 1 to the accumulated number of abnormal leakage, and judging whether the accumulated number of abnormal leakage reaches a second preset number;
when the abnormal accumulated times of leakage reach a second preset time, determining that the low desorption pipeline has leakage, and resetting the abnormal accumulated times of leakage and the abnormal accumulated times of blockage;
the step of determining that the low desorption pipeline is blocked comprises the following steps:
adding 1 to the accumulation frequency of the abnormal blockage, and judging whether the accumulation frequency of the abnormal blockage reaches a third preset frequency;
and when the blockage abnormal accumulation frequency reaches a third preset frequency, determining that the low desorption pipeline is blocked, and resetting the blockage abnormal accumulation frequency and the leakage abnormal accumulation frequency.
6. The method for diagnosing a low desorption line according to any one of claims 1 to 3, wherein the step of determining that the low desorption line has a fault is followed by the steps of:
and sending a fault alarm message and lightening a fault lamp of the engine.
7. A diagnostic terminal, characterized in that it comprises a memory, a processor and a computer program stored on said memory and executable on said processor, said computer program, when executed by said processor, implementing the steps of the diagnostic method of a low desorption circuit according to any one of claims 1 to 6.
8. A vehicle characterized in that it comprises a diagnostic terminal according to claim 7.
9. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the method for diagnosing a low desorption line according to one of claims 1 to 6.
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| CN112924166B (en) * | 2021-03-17 | 2023-01-06 | 潍柴动力股份有限公司 | Overflow valve fault detection method and device, electronic equipment and storage medium |
| CN113063582B (en) * | 2021-03-26 | 2023-11-03 | 东风汽车集团股份有限公司 | EGR valve diagnosis method, device, equipment and readable storage medium |
| CN115217624B (en) * | 2021-04-27 | 2023-08-15 | 广州汽车集团股份有限公司 | Crankcase ventilation pipeline falling diagnosis method and device, vehicle and storage medium |
| CN114263550B (en) * | 2021-09-29 | 2023-06-02 | 联合汽车电子有限公司 | Desorption diagnosis method and device for hybrid electric vehicle, medium, monitor and vehicle |
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