CN114962031B

CN114962031B - Method and system for detecting coking of pipeline of air inlet system of internal combustion engine and vehicle

Info

Publication number: CN114962031B
Application number: CN202210642657.2A
Authority: CN
Inventors: 吴同; 徐宁宁; 宋庆文; 刘泽华; 杨航; 张亮; 董立冬; 刁旭; 闫涛
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2022-06-08
Filing date: 2022-06-08
Publication date: 2023-07-07
Anticipated expiration: 2042-06-08
Also published as: CN114962031A

Abstract

The invention discloses a detection method for coking of a pipeline of an air inlet system of an internal combustion engine, a system and a vehicle thereof, wherein the detection method comprises the following steps: and acquiring target working condition information of an engine of the target vehicle in the running process, determining a target diagnosis standard based on historical data information under the condition that the target working condition information does not meet a preset standard state, or determining the target diagnosis standard as a first diagnosis standard under the condition that the target working condition information meets the preset standard state, comparing the target working condition information with the preset information based on the target diagnosis standard to obtain a comparison result, and outputting fault information under the condition that the comparison result indicates that the engine of the target vehicle has coking faults of an air inlet system pipeline. The invention solves the technical problem of lower reliability of the engine caused by the fact that coking faults of the air inlet system pipeline of the engine cannot be detected in real time in the related art.

Description

Method and system for detecting coking of pipeline of air inlet system of internal combustion engine and vehicle

Technical Field

The invention relates to the technical field of engines, in particular to a method and a system for detecting coking of a pipeline of an air inlet system of an internal combustion engine and a vehicle.

Background

Currently, direct injection gasoline engines are widely used, when the air pipeline of an air inlet system of the direct injection gasoline engine is poor in tightness or slow leakage exists in a heat exchange pipeline of an air inlet intercooler, the problem that coking is generated on the air inlet system pipeline close to an air inlet valve is caused, and the combustion characteristic of the engine is affected by the coking generated on the air inlet system pipeline, so that the running stability of the whole vehicle is affected.

In the related art, the method for diagnosing the coking of the air inlet system pipeline of the engine is as follows: (1) Detaching an air inlet system pipeline of the engine for visual inspection; (2) Installing additional test instrumentation (e.g., humidity sensors, etc.) in the intake system piping of the engine; (3) The engine is controlled to run under a special running condition preset in the electronic control unit of the engine, and the current corresponding sensor signals are collected and compared with the preset data in the electronic control unit of the engine so as to judge whether coking problems exist in the air inlet system pipeline of the engine. For example, a test method based on a specific engine operation condition is used for two times, an actual measurement value and a control target value of the air-fuel ratio of the engine acquired in the two tests are used for data processing by a certain calculation method, and whether coking exists in an air inlet channel of the internal combustion engine or not is identified according to the data processing. However, the method needs to control the engine to run under a special running condition in a special application scene, requires operators to have certain technical expertise and has certain space-time limitation, and can not detect whether the pipeline coking problem exists in the air inlet system of the engine in real time, so that the reliability of the engine is lower.

In view of the above problems, no effective solution has been proposed at present.

Disclosure of Invention

The embodiment of the invention provides a method, a system and a vehicle for detecting coking of an air inlet system pipeline of an internal combustion engine, which at least solve the technical problem that the reliability of the engine is lower because the coking fault of the air inlet system pipeline of the engine cannot be detected in real time in the related technology.

According to one aspect of the embodiment of the invention, a method for detecting coking of an air inlet system pipeline of an internal combustion engine is provided, which comprises the following steps: collecting target working condition information of an engine of a target vehicle in the running process; determining a target diagnosis standard based on historical data information under the condition that the target working condition information does not meet a preset standard state, or determining the target diagnosis standard as a first diagnosis standard under the condition that the target working condition information meets the preset standard state; comparing the target working condition information with preset information based on the target diagnosis standard to obtain a comparison result; and outputting fault information under the condition that the comparison result indicates that the engine of the target vehicle has coking faults of an air inlet system pipeline.

Optionally, the step of collecting target working condition information of the engine of the target vehicle during running includes: collecting all working condition information of an engine of the target vehicle in the running process; determining an engine working condition area of the engine based on a preset detection working condition area, wherein the engine working condition area is a working condition area judged by enabling an engine diagnosis function; screening out the target working condition information of which the time length of the engine running in the working condition area of the engine is longer than a preset time length threshold value from all the working condition information, wherein the target working condition information comprises at least one of the following components: knock signal data of each cylinder of the engine, a spark advance angle retardation angle value of each cylinder of the engine, an engine spark advance angle, an engine speed, an engine air intake amount, an engine air intake temperature, an engine coolant temperature, and a vehicle accelerator pedal opening signal.

Optionally, the step of determining a target diagnostic criteria based on the historical data information includes: determining the correlation between the history working condition information in the history data information and the target working condition information; determining the target diagnosis standard as a second diagnosis standard under the condition that the correlation degree is a first correlation degree; determining that the target diagnostic criteria is a third diagnostic criteria if the correlation is a second correlation, wherein the third diagnostic criteria is divided into a third strict diagnostic criteria and a third non-strict diagnostic criteria; and determining that the target diagnosis standard is a fourth diagnosis standard in the case that the correlation degree is the third correlation degree.

Optionally, the step of determining a correlation between the history operating condition information and the target operating condition information in the history data information includes: obtaining an engine speed value, an engine air inlet temperature value and an engine coolant temperature value in the history working condition information, and obtaining variables and values describing engine load in the history working condition information, wherein the variables and values describing the engine load comprise at least one of the following: engine intake air amount, engine intake air flow, engine intake manifold pressure, engine boost pressure; and determining the relevance by adopting a preset relevance strategy based on the engine speed value, the engine air inlet temperature value, the engine coolant temperature value, the variable and the value describing the engine load and the target working condition information.

Optionally, after determining that the target diagnostic criterion is the third diagnostic criterion in the case that the correlation is the second correlation, the method further includes: executing the third non-rigorous diagnostic criteria if the engine intake air temperature value in the target operating condition information is higher than the engine intake air temperature value in the history operating condition information indicated by the second correlation, or if the engine coolant temperature value in the target operating condition information is higher than the engine coolant temperature value in the history operating condition information indicated by the second correlation; the third strict diagnostic criteria is performed if the engine intake air temperature value in the target operating condition information is lower than the engine intake air temperature value in the history operating condition information indicated by the second correlation, and if the engine coolant temperature value in the target operating condition information is lower than the engine coolant temperature value in the history operating condition information indicated by the second correlation.

Optionally, the first diagnostic criterion is that the value of the ignition advance retardation angle of each cylinder of the engine is compared with a first ignition advance retardation angle lower limit threshold; the second diagnosis standard is that the ignition advance angle retardation angle value of each cylinder of the engine is compared with the ignition advance angle latest retardation angle value of each cylinder of the engine in the history working condition information indicated by the first relativity; the third non-strict diagnosis standard is that the ignition advance angle retardation angle value of each cylinder of the engine is compared with the latest ignition advance angle retardation angle value of each cylinder of the engine in the history working condition information indicated by the second correlation degree; the third strict diagnosis standard is that the ignition advance angle retardation angle value of each cylinder of the engine is compared with a second ignition advance angle retardation lower limit threshold value; the fourth diagnosis standard is that the ignition advance retardation angle value of each cylinder of the engine is compared with a third ignition advance retardation angle lower limit threshold, wherein the second ignition advance retardation angle lower limit threshold is the sum of the latest ignition advance retardation angle value of each cylinder of the engine and a preset strict addition angle value in the history working condition information indicated by the second correlation, and the influence factor of the preset strict addition angle value comprises at least one of the following: engine coolant temperature, engine intake temperature.

Optionally, the preset information includes at least one of: the engine target working condition information meets the judgment standard of a preset standard state, the correlation degree judgment standard of the engine target working condition information and historical data information, the first diagnosis standard, the second diagnosis standard, the third diagnosis standard, the fourth diagnosis standard, the working condition area judged by enabling an engine diagnosis function, the first ignition advance angle delay angle lower limit threshold value, the second ignition advance angle delay angle lower limit threshold value, the third ignition advance angle delay angle lower limit threshold value, the engine target air inlet temperature corresponding to the target working condition information and the engine target cooling liquid temperature corresponding to the target working condition information, wherein the engine target working condition information meets the judgment standard of the preset standard state: the absolute value of the difference between the engine coolant temperature value in the target working condition information and the preset engine target coolant temperature is smaller than the lower limit threshold of the deviation of the engine coolant temperature value in the preset standard state, and the absolute value of the difference between the engine air inlet temperature value in the target working condition information and the preset engine target air inlet temperature is smaller than the lower limit threshold of the deviation of the engine air inlet temperature value in the preset standard state.

According to another aspect of the embodiment of the present invention, there is also provided a system for detecting coking of a pipeline of an intake system of an internal combustion engine, including: the diagnosis information processing unit is used for collecting target working condition information of the engine of the target vehicle in the running process; determining a target diagnosis standard based on historical data information under the condition that the target working condition information does not meet a preset standard state, or determining the target diagnosis standard as a first diagnosis standard under the condition that the target working condition information meets the preset standard state; comparing the target working condition information with preset information based on the target diagnosis standard to obtain a comparison result; under the condition that the comparison result indicates that the engine of the target vehicle has coking faults of an air inlet system pipeline, fault information is sent to an engine electronic control unit; and the engine electronic control unit is connected with the diagnosis information processing unit and used for controlling the operation of the engine and each component thereof, receiving the fault information and adjusting the numerical value of each control parameter of the engine and each component thereof based on the fault information.

According to another aspect of the embodiment of the invention, a vehicle is further provided, which comprises a vehicle-mounted electronic control unit, wherein the vehicle-mounted electronic control unit is used for executing the method for detecting the coking of the air inlet system pipeline of the internal combustion engine.

According to another aspect of the embodiment of the invention, a vehicle-mounted readable storage medium is provided, the vehicle-mounted readable storage medium comprises a stored computer program, and equipment where the vehicle-mounted readable storage medium is located is controlled to execute the method for detecting the coking of the pipeline of the air inlet system of the internal combustion engine when the computer program runs.

In the invention, target working condition information of an engine of a target vehicle in a running process is acquired, a target diagnosis standard is determined based on historical data information under the condition that the target working condition information does not meet a preset standard state, or the target diagnosis standard is determined to be a first diagnosis standard under the condition that the target working condition information meets the preset standard state, the target working condition information is compared with the preset information based on the target diagnosis standard, a comparison result is obtained, and fault information is output under the condition that the comparison result indicates that the engine of the target vehicle has coking faults of an air inlet system pipeline. In the application, the target working condition information of the engine of the target vehicle in the running process can be acquired, the target diagnosis standard is determined based on the historical data information, then, the target working condition information and the preset information can be compared according to the target diagnosis standard, the fault information is output under the condition that the comparison result indicates that the engine has pipeline coking faults, and the user is timely reminded of the pipeline coking problems of the engine, so that the pipeline coking faults of the engine can be detected in real time, the reliability of the engine is improved, and the technical problem that the reliability of the engine is lower due to the fact that the pipeline coking faults of an air inlet system of the engine cannot be detected in real time in the related technology is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:

FIG. 1 is a flow chart of an alternative method for detecting coking in an air intake system of an internal combustion engine according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an alternative internal combustion engine air induction system line coking detection system according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a diagnostic flow of an alternative diagnostic information processing unit according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an alternative real-time operating condition information collection procedure according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an alternative real-time operating condition information comparison flow in accordance with an embodiment of the present invention;

FIG. 6 is a schematic diagram of an alternative instruction generation flow in accordance with an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, 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 following embodiments of the invention can be applied to various application scenarios for detecting coking of the engine air inlet system pipeline. The invention can be internally provided with a created diagnosis program and a diagnosis method in the electronic control unit of the vehicle engine, when the engine is in a preset operation condition, signals collected by the electronic control unit of the engine and the sensor are received, processed and stored to be used as a basis for diagnosing coking of an air inlet system pipeline of the engine caused by abnormal liquid infiltration, and whether coking faults exist in the air inlet system pipeline of the current engine is judged by comparing the signals collected by the electronic control unit of the current engine and the sensor with historical engine operation condition data stored by the diagnosis program or the diagnosis module.

According to the invention, the air inlet system pipeline of the engine is not required to be disassembled for visual inspection, an additional testing instrument is not required to be installed in the air inlet system pipeline of the engine, the engine is not required to be controlled to operate under a certain specific operation condition, the data of the engine operation condition when the user vehicle runs daily can be used as a data reference for judging whether the coking problem exists in the air inlet system pipeline of the engine, the technical difficulty for diagnosing the coking problem of the engine pipeline can be effectively reduced, and the application scene of the technology can be expanded.

The present invention will be described in detail with reference to the following examples.

Example 1

In accordance with an embodiment of the present invention, there is provided an embodiment of a method for detecting coking of an air intake system of an internal combustion engine, it being noted that the steps illustrated in the flow chart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical sequence is illustrated in the flow chart, in some cases the steps illustrated or described may be performed in a different order than that illustrated herein.

FIG. 1 is a flow chart of an alternative method for detecting coking in an air intake system of an internal combustion engine, according to an embodiment of the present invention, as shown in FIG. 1, the method comprising the steps of:

Step S101, collecting target working condition information of an engine of a target vehicle during running.

Step S102, determining a target diagnosis standard based on the historical data information when the target working condition information does not meet the preset standard state, or determining the target diagnosis standard as a first diagnosis standard when the target working condition information meets the preset standard state.

And step S103, comparing the target working condition information with preset information based on the target diagnosis standard to obtain a comparison result.

Step S104, outputting fault information when the comparison result indicates that the engine of the target vehicle has coking faults of the air inlet system pipeline.

Through the steps, the target working condition information of the engine of the target vehicle in the running process can be acquired, the target diagnosis standard is determined based on the historical data information under the condition that the target working condition information does not meet the preset standard state, or the target diagnosis standard is determined to be the first diagnosis standard under the condition that the target working condition information meets the preset standard state, the target working condition information is compared with the preset information based on the target diagnosis standard, a comparison result is obtained, and fault information is output under the condition that the comparison result indicates that the coking fault of the air inlet system pipeline of the engine of the target vehicle occurs. In the embodiment of the invention, the target working condition information of the engine of the target vehicle in the running process can be acquired, the target diagnosis standard is determined based on the historical data information, then the target working condition information and the preset information can be compared according to the target diagnosis standard, the fault information is output under the condition that the comparison result indicates that the engine has pipeline coking faults, and the user is timely reminded of the pipeline coking problems of the engine, so that the pipeline coking faults of the engine can be detected in real time, the reliability of the engine is improved, and the technical problem that the reliability of the engine is lower due to the fact that the pipeline coking faults of an air inlet system of the engine cannot be detected in real time in the related art is solved.

Embodiments of the present invention will be described in detail with reference to the following steps.

Optionally, the step of collecting target working condition information of the engine of the target vehicle during running includes: collecting all working condition information of an engine of a target vehicle in the running process; determining an engine working condition area of an engine based on a preset detection working condition area, wherein the engine working condition area is a working condition area judged by enabling an engine diagnosis function; screening target working condition information of the time length of the engine running in the working condition area of the engine, which is longer than a preset time length threshold value, from all the working condition information, wherein the target working condition information comprises at least one of the following components: knock signal data of each cylinder of the engine, a spark advance angle retardation angle value of each cylinder of the engine, an engine spark advance angle, an engine speed, an engine air intake amount, an engine air intake temperature, an engine coolant temperature, and a vehicle accelerator pedal opening signal.

In the embodiment of the invention, all the working condition information of the engine in the running process of the target vehicle can be collected first, then, the engine working condition area of the engine is determined based on the preset detection working condition area, the engine working condition area is the working condition area judged by the enabling of the engine diagnosis function, and the target working condition information that the time length of the engine running in the engine working condition area is longer than the preset time length threshold (which can be set according to the actual situation) is screened out from all the working condition information.

In this embodiment, the target operating condition information includes at least one of: real-time knock signal data of each cylinder of the engine, a real-time delay angle value of an ignition advance angle of each cylinder of the engine caused by knocking, a real-time ignition advance angle of the engine, a real-time rotating speed of the engine, a real-time relative air inflow of the engine, a real-time air inflow temperature of the engine, a real-time cooling liquid temperature of the engine, a real-time accelerator pedal opening signal of a vehicle driver and the like.

In the present embodiment, knocking of each cylinder of the engine means abnormal combustion of the gasoline engine under a certain condition (e.g., a compression ratio is too high), a pressure curve is high-frequency and fluctuates greatly, and at this time, a flame propagation speed and a flame front shape are drastically changed, which is called knocking, which is an external reaction of knocking.

In this embodiment, in order to enable the gasoline engine to obtain the maximum power possible after the compression stroke is completed, the ignition coil and the ignition plug of the engine are generally controlled to perform discharge ignition in advance before the piston reaches the top dead center (because there is a fire delay period).

In this embodiment, the accelerator pedal is also called an accelerator pedal, and is used to express the acceleration requirement of the user on the vehicle and the torque requirement on the engine, and the electronic control unit of the engine controls the opening of the throttle valve of the gasoline engine and the control parameters related to the supercharger according to the numerical value of the opening signal of the accelerator pedal of the vehicle, so as to control the power output of the engine.

In this embodiment, the preset detection working condition area is a preset coking diagnosis working condition area of the engine air intake system, and the preset method of the coking diagnosis working condition area of the engine air intake system is various, and this embodiment is described by the following examples: (1) The region can be an engine operation working condition region determined by an engine air inlet system coking diagnosis rotating speed lower limit threshold value, an engine air inlet system coking diagnosis rotating speed upper limit threshold value, an engine air inlet system coking diagnosis load lower limit threshold value and an engine air inlet system coking diagnosis load upper limit threshold value; (2) The region may be an engine operating condition region described by a series of engine intake system coking diagnostic speed arrays and lower and upper engine intake system coking diagnostic engine relative intake air amount thresholds corresponding to each engine intake system coking diagnostic speed value, or lower and upper engine intake system coking diagnostic load thresholds corresponding to each engine intake system coking diagnostic speed value. The engine intake system coking diagnostic load may be represented by or replaced by an engine torque (or an engine relative air intake amount, an engine intake air flow, an engine intake manifold pressure, a load factor, etc.), an engine intake system coking diagnostic rotational speed lower threshold, an engine intake system coking diagnostic rotational speed upper threshold, an engine intake system coking diagnostic load lower threshold, an engine intake system coking diagnostic load upper threshold (or a series of engine intake system coking diagnostic rotational speed arrays, and an engine intake system coking diagnostic engine relative air intake amount lower threshold and an engine intake system coking diagnostic load upper threshold corresponding to each engine intake system coking diagnostic rotational speed value, or an engine intake system coking diagnostic load lower threshold and an engine intake system coking diagnostic load upper threshold corresponding to each engine intake system coking diagnostic rotational speed value may be selected for different engine models, which is not limited in this embodiment.

For example, two preset methods for the above engine intake system coking diagnostic operating condition region are described for a particular engine model example: aiming at the preset method (1), the lower limit threshold value of the coking diagnosis rotating speed of the engine air inlet system is 3500r/min, the upper limit threshold value of the coking diagnosis rotating speed of the engine air inlet system is 5500r/min, the lower limit threshold value of the coking diagnosis engine of the engine air inlet system relative to the air inflow is 60%, and the upper limit threshold value of the coking diagnosis engine of the engine air inlet system relative to the air inflow is 170%; for the preset method (2), a series of engine air inlet system coking diagnosis rotating speed arrays shown in table 1, a lower limit threshold and an upper limit threshold of relative air inflow of an engine air inlet system coking diagnosis engine corresponding to the coking diagnosis rotating speed values of each engine air inlet system, different lower limit thresholds of engine air inlet system coking diagnosis loads and different upper limit thresholds of engine air inlet system coking diagnosis loads can be selected.

TABLE 1

In this embodiment, the engine operating condition area of the engine indicates that the engine is operating in the diagnostic operating condition area, and specifically indicates that the engine real-time operating condition point (including an engine real-time rotational speed value and an engine real-time load value, where the engine real-time load value may be represented by or replaced by an engine real-time relative intake air amount, an engine real-time intake air flow, and an engine real-time intake manifold pressure value) is within the coking diagnostic operating condition area of the engine intake system. For example, the method (1) is preset aiming at an engine air inlet system coking diagnosis working condition area, wherein the engine working condition area of the engine represents that the real-time rotating speed value of the engine is larger than or equal to the lower limit threshold value of the coking diagnosis rotating speed of the engine air inlet system, the real-time rotating speed value of the engine is smaller than or equal to the upper limit threshold value of the coking diagnosis rotating speed of the engine air inlet system, the real-time load value of the engine is larger than or equal to the lower limit threshold value of the coking diagnosis load of the engine air inlet system, and the real-time load value of the engine is smaller than or equal to the upper limit threshold value of the coking diagnosis load of the engine air inlet system; according to the method (2) for presetting the coking diagnosis working condition area of the engine air inlet system, if the condition that the engine runs in the diagnosis working condition area is required to be judged to be met, firstly, the engine air inlet system coking diagnosis working condition area of the engine is required to be inquired about a position between certain two groups of elements of the coking diagnosis working condition array of the engine air inlet system according to the real-time engine speed value, and then according to the lower coking diagnosis load limit threshold value of the engine air inlet system, the upper coking diagnosis load limit threshold value of the engine air inlet system and the linear interpolation method corresponding to the two groups of elements, the lower coking diagnosis load limit threshold value of the engine air inlet system and the upper coking diagnosis load limit threshold value of the engine air inlet system according to the real-time engine speed value are obtained, and on the basis, the engine working condition area of the engine represents that the real-time engine load value is larger than or equal to the lower coking diagnosis load limit threshold value of the engine air inlet system which is inquired by the linear interpolation method, and the real-time engine load value is smaller than or equal to the upper coking diagnosis load limit threshold value of the engine air inlet system which is inquired by the linear interpolation method.

In an alternative embodiment, after the target working condition information of the engine during the driving process of the target vehicle is collected, whether the target working condition information meets a preset standard state or not is judged first, and under the condition that the target working condition information meets the preset standard state, the target diagnosis standard can be directly determined to be a first diagnosis standard, wherein the preset standard state represents a standard value of a working condition parameter variable of an engine working condition point, the value of the working condition parameter variable of the engine working condition point is equal to or within a preset value range of the standard value, and the first diagnosis standard is that the value of the ignition advance angle of each cylinder of the engine is compared with a lower limit threshold value of the first ignition advance angle.

In the embodiment of the invention, the preset standard state can be expressed as a standard state of an engine working condition, specifically, the real-time value describing the parameter variable of the working condition of the engine such as the real-time air inlet temperature of the engine, the real-time cooling liquid temperature of the engine (which can also comprise the real-time air inlet humidity of the engine, the real-time engine oil pressure of the engine, the real-time engine oil temperature of the engine and the like) is equal to the preset value range of the parameter variable standard (or benchmark) of the working condition of the engine aiming at the real-time operation working condition point (comprising the real-time engine speed value and the real-time engine load value of the engine, wherein the real-time load value of the engine can be represented by or replaced by the real-time relative air inlet amount of the engine, the real-time air inlet flow of the engine and the pressure value of an air inlet manifold of the engine) in a corresponding state describing the parameter variable standard (or benchmark) of the working condition of the engine or the standard (or benchmark) value is within the preset value range of the standard (or benchmark) value. In this embodiment, the standard (or reference) value and the above-mentioned preset value range may be preset or set by the engine electronic control data calibration engineer during the engine electronic control data calibration development stage, or may be updated by using an Over-the-Air Technology (OTA) in the vehicle operation stage through a wireless network communication manner (a wireless network or a vehicle networking manner or a medium provided by a communication provider), so as to update an online database of the standard (or reference) value or the standard (or reference) value range of the parameter variable of the engine working condition "standard state" in the vehicle operation stage, which is not limited herein.

The first diagnostic criteria may be expressed in particular as: if the value of the ignition timing advance real-time retardation angle value iac_knkrtd_a of each cylinder of the engine caused by knocking is smaller than or equal to the value of the first ignition timing advance retardation angle lower limit threshold value iac_knkrtd_c01_v_l (i.e., iac_knkrtd_a is smaller than or equal to iac_knkrtd_c01_v_l), the determination result is: the coking problem exists in the pipeline of the engine air inlet system; if the value of the ignition timing advance real-time retardation angle value iac_knkrtd_a of each cylinder of the engine caused by knocking is greater than the value of the first ignition timing advance retardation angle lower limit threshold value iac_knkrtd_c01_v_l (i.e., iac_knkrtd_a > iac_knrtd_c01_v_l), the determination result is: no coking problem is found in the engine air inlet system pipeline. For example, a first ignition-advance-angle-retard lower threshold iac_knkrtd_c01_v_l= -2 ° CA (° CA represents the crank angle degrees, -2 ° CA represents the 2-degree crank angle retarded relative to the ignition advance angle corresponding to the engine operating condition in the calibrated preset electronic control data) may be selected.

Optionally, the step of determining the target diagnostic criteria based on the historical data information includes: determining the correlation between the history working condition information and the target working condition information in the history data information; under the condition that the correlation degree is the first correlation degree, determining that the target diagnosis standard is a second diagnosis standard; determining that the target diagnostic criteria is a third diagnostic criteria in the case that the correlation is the second correlation, wherein the third diagnostic criteria is divided into a third strict diagnostic criteria and a third non-strict diagnostic criteria; in the case where the correlation is the third correlation, the target diagnosis criterion is determined to be the fourth diagnosis criterion.

In the embodiment of the invention, the historical working condition information similar to the target working condition information can be searched according to the historical data information (namely, the correlation between the historical working condition information in the historical data information and the target working condition information is determined), and if the historical working condition information with high correlation (namely, the correlation is the first correlation) with the target working condition information is searched (namely, under the condition that the correlation is the first correlation), the target diagnosis standard can be determined to be the second diagnosis standard; if the historical working condition information in the correlation with the target working condition information (namely, the correlation is the second correlation) is searched (namely, in the case that the correlation is the second correlation), the target diagnosis standard is determined to be a third diagnosis standard; if historical operating condition information having a lower degree of correlation with the target operating condition information (i.e., the degree of correlation is the third degree of correlation) is searched (i.e., in the case where the degree of correlation is the third degree of correlation), the target diagnostic criteria may be determined to be fourth diagnostic criteria.

Optionally, the step of determining a correlation between the history operating condition information and the target operating condition information in the history data information includes: acquiring an engine speed value, an engine air inlet temperature value and an engine coolant temperature value in the history working condition information, and acquiring a variable and a value describing engine load in the history working condition information, wherein the variable and the value describing the engine load comprise at least one of the following: engine intake air amount, engine intake air flow, engine intake manifold pressure, engine boost pressure; and determining the relevance by adopting a preset relevance strategy based on the engine speed value, the engine air inlet temperature value, the engine coolant temperature value, the variables and values describing the engine load and the target working condition information.

In the embodiment of the invention, the correlation between the history working condition information and the target working condition information (namely, the engine working condition correlation) is specifically expressed as: the similarity between the real-time working condition (namely, target working condition information) of the engine and the engine operation working condition (namely, history working condition information) in the searched historical data information of the engine operation working condition, and the variables for describing the engine operation working condition representing the similarity comprise at least one of the following: the real-time rotating speed of the engine, the real-time relative air inflow of the engine, the real-time air inflow temperature of the engine, the real-time cooling liquid temperature of the engine, the real-time accelerator pedal opening degree of a vehicle driver and the like can judge that the engine real-time working condition is high in engine working condition correlation degree or medium in engine working condition correlation degree or low in engine working condition correlation degree according to different similar degrees compared with the searched engine operation working condition historical data information.

In this embodiment, the engine speed value, the engine intake air temperature value, the engine coolant temperature value, and the variable and the value describing the engine load in the history information may be obtained first, where the variable and the value describing the engine load include at least one of: the method comprises the steps of determining the relevance by adopting a preset relevance strategy according to the engine speed value, the engine load, the engine air inlet temperature value, the engine coolant temperature value, the variable and the value describing the engine load and target working condition information. The preset correlation policy in this embodiment includes: the judging conditions that the engine working condition correlation is high, the judging conditions that the engine working condition correlation is medium, and the like are specifically:

Judging condition that the engine working condition correlation degree is high: the following determination conditions are satisfied at the same time: comparing the real-time working condition of the engine with the engine operation working condition in the engine operation working condition historical data information obtained by searching, wherein the working condition equal to the real-time rotating speed of the engine (or the rotating speed difference is smaller than or equal to a preset threshold (such as 50 r/min)) exists in the engine operation working condition historical data information obtained by searching; and the absolute value of the relative difference between the real-time load value of the engine in the working condition and the engine load value of the corresponding working condition in the searched historical data information of the engine operation working condition is smaller than or equal to a preset threshold (for example, 5 percent); and the absolute value of the difference between the real-time air inlet temperature of the engine in the working conditions and the engine air inlet temperature value of the corresponding working condition in the searched historical data information of the engine operation working conditions is smaller than or equal to a preset threshold (for example, 5 ℃); and the absolute value of the difference between the real-time engine coolant temperature in the working conditions and the engine coolant temperature value of the corresponding working condition in the searched historical data information of the engine operation working conditions is smaller than or equal to a preset threshold (e.g. 5 ℃). In this embodiment, additional other determination conditions and preset rules may be added according to the product application scene difference and the product function difference, which is not limited herein.

Judging conditions in the engine working condition relativity are as follows: the following determination conditions are satisfied at the same time: firstly, a judging condition that the correlation degree of the working condition of an engine is high is not satisfied; and the real-time working condition of the engine is compared with the engine operation working condition in the engine operation working condition historical data information obtained by searching, and the working condition equal to the real-time rotating speed of the engine (or the rotating speed difference is smaller than or equal to a preset threshold (such as 50 r/min)) exists in the engine operation working condition historical data information obtained by searching; and the absolute value of the relative difference between the real-time load value of the engine in the working condition and the engine load value of the corresponding working condition in the searched historical data information of the engine operation working condition is smaller than or equal to a preset threshold (for example, 5%). In this embodiment, additional other determination conditions and preset rules may be added according to the product application scene difference and the product function difference, which is not limited herein.

In this embodiment, when the determination condition that the degree of correlation is high or medium is not satisfied, it is determined that the degree of correlation of the engine operating condition is low.

Alternatively, when the degree of similarity between the searched historical working condition information and the target working condition information is low according to the historical data information, the target working condition information can be classified and stored.

Optionally, in the case that the correlation is the second correlation, after determining that the target diagnostic criterion is the third diagnostic criterion, the method further includes: executing a third non-stringent diagnostic criterion if the engine intake air temperature value in the target operating condition information is higher than the engine intake air temperature value in the history operating condition information indicated by the second correlation, or if the engine coolant temperature value in the target operating condition information is higher than the engine coolant temperature value in the history operating condition information indicated by the second correlation; the third strict diagnostic criteria is performed in the case where the engine intake air temperature value in the target operating condition information is lower than the engine intake air temperature value in the history operating condition information indicated by the second correlation, and in the case where the engine coolant temperature value in the target operating condition information is lower than the engine coolant temperature value in the history operating condition information indicated by the second correlation.

In the embodiment of the invention, the third diagnosis standard can be divided into two sub-diagnosis standards according to the comparison result of the severity of the engine operation condition with the engine operation condition relevance being medium (namely, the relevance is the second relevance) obtained by the engine real-time working condition and the search: a third stringent diagnostic criterion and a third non-stringent diagnostic criterion, respectively. If the engine real-time operating condition is worse than the engine operating condition for which the search results in the second correlation, then a third non-rigorous diagnostic criteria is performed (i.e., the third non-rigorous diagnostic criteria is performed if the engine intake temperature value in the target operating condition information is higher than the engine intake temperature value in the history operating condition information indicated by the second correlation, or if the engine coolant temperature value in the target operating condition information is higher than the engine coolant temperature value in the history operating condition information indicated by the second correlation); if the engine operating condition of the second correlation is found to be worse than the engine real-time condition, a third strict diagnostic criterion is performed (i.e., the third strict diagnostic criterion is performed if the engine intake air temperature value in the target condition information is lower than the engine intake air temperature value in the history condition information indicated by the second correlation and if the engine coolant temperature value in the target condition information is lower than the engine coolant temperature value in the history condition information indicated by the second correlation).

Optionally, the first diagnostic criterion is that a value of the spark advance retard angle for each cylinder of the engine is compared to a first spark advance retard angle lower threshold; the second diagnosis standard is that the ignition advance angle retardation angle value of each cylinder of the engine is compared with the latest ignition advance angle retardation angle value of each cylinder of the engine in the history working condition information indicated by the first relativity; the third non-strict diagnosis standard is that the ignition advance angle retardation angle value of each cylinder of the engine is compared with the latest ignition advance angle retardation angle value of each cylinder of the engine in the history working condition information indicated by the second correlation degree; the third strict diagnostic criterion is that the ignition advance retardation angle value of each cylinder of the engine is compared with a second ignition advance retardation angle lower limit threshold value; the fourth diagnosis standard is that the ignition advance angle retardation value of each cylinder of the engine is compared with a third ignition advance angle retardation lower limit threshold, wherein the second ignition advance angle retardation lower limit threshold is the sum of the latest ignition advance angle retardation value of each cylinder of the engine and a preset strict addition angle value in the history working condition information indicated by the second correlation, and the influence factor of the preset strict addition angle value comprises at least one of the following components: engine coolant temperature, engine intake temperature.

In an embodiment of the present invention, the second diagnostic criteria may be defined as: if the value of the ignition timing real-time retardation angle value iac_knkrtd_a of each cylinder of the engine caused by knocking is smaller than or equal to the value of the ignition timing latest retardation angle value iac_knkrtd_hscdat_wst of each cylinder of the engine caused by knocking in the engine operation condition history data information of which the engine condition correlation is high obtained by searching (i.e., iac_knkrtd_hscdat_wst is smaller than or equal to the value of the ignition timing latest retardation angle value iac_knkrtd_a of each cylinder of the engine caused by knocking), the determination result is: the coking problem exists in the pipeline of the engine air inlet system; if the value of the ignition timing real-time retardation angle value iac_knkrtd_a of each cylinder of the engine caused by knocking is larger than the value of the latest retardation angle value iac_knkrtd_hscdat_wst of each cylinder of the engine caused by knocking in the engine operation condition history data information of which the engine condition correlation is high obtained by searching (i.e. iac_knkrtd_a > iac_knrtd_hscdat_wst), the judgment result is that: no coking problem is found in the engine air inlet system pipeline (namely, the second diagnosis standard is that the ignition advance angle retardation angle value of each cylinder of the engine is compared with the latest ignition advance angle retardation angle value of each cylinder of the engine in the historical working condition information indicated by the first correlation degree).

The third non-rigorous diagnostic criteria may be defined as: if the value of the ignition timing real-time retardation angle value iac_knkrtd_a of each cylinder of the engine caused by knocking is smaller than or equal to the value of the ignition timing latest retardation angle value iac_knkrtd_hscdat_wst of each cylinder of the engine caused by knocking in the engine operation condition history data information of which the engine condition correlation is the middle is searched, the judgment result is that: the coking problem exists in the pipeline of the engine air inlet system; if the value of the real-time retardation angle value iac_knkrtd_a of the ignition advance angle caused by knocking of each cylinder of the engine is larger than the value of the latest retardation angle value iac_knkrtd_hscdat_wst of the ignition advance angle caused by knocking of each cylinder of the engine in the engine operation condition history data information of which the engine condition correlation is the middle is searched, the judgment result is that: no coking problem is found in the air inlet system pipeline of the engine (namely, the third non-strict diagnosis standard is that the ignition advance angle retardation angle value of each cylinder of the engine is compared with the latest ignition advance angle retardation angle value of each cylinder of the engine in the history working condition information indicated by the second correlation degree).

The third stringent diagnostic criteria may be defined as: if the value of the ignition timing advance real-time retardation angle value iac_knkrtd_a of each cylinder of the engine caused by knocking is smaller than or equal to the value of the second ignition timing advance lower limit threshold value iac_knkrtd_c03_strc_v_l (i.e., iac_knkrtd_a is smaller than or equal to iac_knrtd_c03_strc_v_l), the determination result is: the coking problem exists in the pipeline of the engine air inlet system; if the value of the ignition timing advance real-time retardation angle value iac_knkrtd_a of each cylinder of the engine caused by knocking is greater than the value of the second ignition timing advance retardation angle lower limit threshold value iac_knkrtd_c03_strc_v_l (i.e., iac_knkrtd_a > iac_knkrtd_c03_strc_v_l), the determination result is: the engine air intake system pipeline has the problem of coking (namely, the third strict diagnosis standard is that the ignition advance angle retardation angle value of each cylinder of the engine is compared with a second ignition advance angle retardation angle lower limit threshold value), wherein the value of the second ignition advance angle retardation angle lower limit threshold value IAC_KnkRtd_C03_Strc_V_L is equal to the algebraic sum of two variables: the first variable is a latest ignition angle retardation angle value iac_knkrtd_hscdat_wst of each cylinder of the engine caused by knocking in the engine operation condition history data information of which the engine condition correlation is middle, and the second variable is a preset strict addition angle iac_knkrtd_c03_strad (or iac_knrtd_c03_stradd_sum), that is, iac_knkrtd_c03_strac_v_l=iac_knkrtd_hscdat_wst+iac_knrtd_c03_stradd (that is, the second ignition angle retardation angle lower threshold is the Sum of the latest ignition angle retardation angle value of each cylinder of the engine and the preset strict addition angle value in the history data indicated by the second correlation).

In this embodiment, the preset strict addition angle iac_knkrtd_c03_strcoadd_sum may be selected according to the model of different engines, which is not limited herein. For example, the preset strict addition angle iac_knkrtd_c03_strcoadd_sum may be selected according to the addition rules as shown in tables 2 and 3. It should be further noted that, the addition rule of the preset strict addition angle iac_knkrtd_c03_strcadd_sum may be not limited to those based on the two influencing factors (engine real-time coolant temperature, engine real-time intake temperature) listed in tables 2 and 3, but may also add additional influencing factors and preset rules according to the product application scene difference and the product function difference; in addition, when a plurality of influence factors are different in the process of comparing the real-time working condition of the engine with the engine working condition of which the engine working condition relativity is the middle obtained by searching, the addition value of IAC_KnkRtd_C03_StrcAdd_Sum (IAC\u) knkrtd_c03_strcoadd_sum=iac_knkrtd_c03_strcoadd EngW+IAC_KnkRtd_C03_StrcAdd_Intk+ …).

Table 2 Preset strict addition angle IAC_KnkRtd_C03_StrcAdd_EngW preset rules example (based on Engine real time coolant temperature)

T_EngW_a-T_EngW_HscDat_Wst	0	-5	-10	-15	-20
						IAC_KnkRtd_C03_StrcAdd_EngW	0	+2	+4	+6	+8

Table 3 preset strict addition angle IAC_KnkRtd_C03_StrcAdd_Intk preset rules example (based on Engine real time intake temperature)

T_Intk_a-T_Intk_HscDat_Wst	0	-8	-15	-22	-30
						IAC_KnkRtd_C03_StrcAdd_Intk	0	+2	+4	+6	+8

Wherein, T_EngW_a-T_EngW_HscDat_Wst represents the latest delay angle value when the influence factor of the preset strict addition angle value is the real-time cooling liquid temperature of the engine, and T_Intk_a-T_Intk_HscDat_Wst represents the latest delay angle value when the influence factor of the preset strict addition angle value is the real-time air intake temperature of the engine.

The fourth diagnostic criteria may be defined as: if the value of the ignition timing advance real-time retardation angle value iac_knkrtd_a of each cylinder of the engine caused by knocking is smaller than or equal to the value of the third ignition timing advance retardation angle lower limit threshold value iac_knkrtd_c04_v_l (i.e., iac_knkrtd_a is smaller than or equal to iac_knkrtd_c04_v_l), the determination result is: the coking problem exists in the pipeline of the engine air inlet system; if the value of the ignition timing advance angle real-time retardation value iac_knkrtd_a of each cylinder of the engine caused by knocking is greater than the value of the third ignition timing advance angle lower limit threshold value iac_knkrtd_c04_v_l (i.e., iac_knkrtd_a > iac_knkrtd_c04_v_l), the determination result is: no coking problem is found in the engine air intake system pipeline (namely, the fourth diagnosis standard is that the ignition advance angle retardation angle value of each cylinder of the engine is compared with the third ignition advance angle retardation lower limit threshold value). For example, a third spark advance angle retard lower threshold iac_knkrtd_c04_v_l= -8 ° CA may be selected.

Optionally, the preset information includes at least one of: the engine target working condition information meets the judgment standard of a preset standard state, the correlation degree judgment standard of the engine target working condition information and the historical data information, the first diagnosis standard, the second diagnosis standard, the third diagnosis standard, the fourth diagnosis standard, the working condition area judged by enabling an engine diagnosis function, the first ignition advance angle delay angle lower limit threshold value, the second ignition advance angle delay angle lower limit threshold value, the third ignition advance angle delay angle lower limit threshold value, the engine target air inlet temperature corresponding to the target working condition information and the engine target cooling liquid temperature corresponding to the target working condition information, wherein the judgment standard of the engine target working condition information meets the preset standard state is as follows: the absolute value of the difference between the engine coolant temperature value in the target working condition information and the preset engine target coolant temperature is smaller than the lower limit threshold of the deviation of the engine coolant temperature value in the preset standard state, and the absolute value of the difference between the engine air inlet temperature value in the target working condition information and the preset engine target air inlet temperature is smaller than the lower limit threshold of the deviation of the engine air inlet temperature value in the preset standard state.

In the embodiment of the invention, the target working condition information and the preset information (the preset information comprises a judging standard that the engine target working condition information meets a preset standard state, a correlation judging standard of the engine target working condition information and the historical data information, a first diagnosis standard, a second diagnosis standard, a third diagnosis standard, a fourth diagnosis standard, a working condition area judged by enabling an engine diagnosis function, a first ignition advance angle delay angle lower limit threshold, a second ignition advance angle delay angle lower limit threshold, a third ignition advance angle delay angle lower limit threshold, an engine target air inlet temperature corresponding to the target working condition information, an engine target cooling liquid temperature corresponding to the target working condition information and the like, wherein the judging standard that the engine target working condition information meets the preset standard state is that the absolute value of the difference value between the engine cooling liquid temperature value in the target working condition information and the preset engine target cooling liquid temperature is smaller than a preset standard state engine cooling liquid temperature value deviation lower limit threshold, and the absolute value between the engine air inlet temperature value in the target working condition information and the preset engine target air inlet temperature is smaller than a preset standard state engine temperature deviation lower limit threshold) can be compared, and therefore a comparison result is obtained.

In the embodiment of the invention, under the condition that the comparison result indicates that the engine of the target vehicle has the coking fault of the air inlet system pipeline (namely, under the condition that the comparison result meets the diagnosis preset condition, the problem of the coking of the air inlet system pipeline of the engine of the target vehicle is determined, wherein the diagnosis preset condition is a preset condition for judging that the parameter variable value of the engine does not meet the value or the threshold value when the pipeline normally works, for example, the value of the relevant parameter of the target working condition information exceeds the threshold value range of the target diagnosis standard, and the preset range can be set by the target diagnosis standard), fault information is output, so that a user is reminded of the problem of the coking of the air inlet system pipeline of the engine caused by the penetration of liquid into the air inlet system of the engine is reminded, and the user is reminded of going to a designated maintenance place to carry out fault treatment.

In the embodiment of the invention, the coking diagnosis working condition area, the first diagnosis standard, the second diagnosis standard, the third diagnosis standard (comprising a third strict diagnosis standard and a third non-strict diagnosis standard), the fourth diagnosis standard, the engine working condition relativity judgment standard and other diagnosis preset conditions of the engine air inlet system related in the engine pipeline coking detection flow can be updated in the vehicle using stage by utilizing an over-the-air technology in a wireless network communication mode. In addition, the engine condition history data information in the embodiment can also be data-shared with the vehicles which are assembled with the same type of engine and are already put into use through a wireless network communication mode (or the internet of vehicles), namely, the engine condition history data information of other vehicles which are assembled with the same type of engine and are already put into use is searched and received through the wireless network communication mode (or the internet of vehicles).

In the embodiment of the invention, visual inspection is not required to be carried out by disassembling an air inlet system pipeline of the engine, an additional testing instrument is not required to be installed in the air inlet system pipeline of the engine, the engine is not required to be controlled to operate under a certain specific operating condition, the data of the operating condition of the engine can be used as a data reference for judging whether coking problems exist in the air inlet system pipeline of the engine or not only by collecting the data of the operating condition of the engine when a user vehicle runs daily, the technical difficulty of detecting pipeline coking can be reduced, and the application scene of the pipeline coking detection technology can be expanded.

Example two

FIG. 2 is a schematic diagram of an alternative internal combustion engine air induction system conduit coking detection system, according to an embodiment of the present invention, as shown in FIG. 2, which may include: a diagnosis information processing unit 1, an engine electronic control unit 2, a sensor 3, an actuator 4, and an in-vehicle information control display 5, wherein the diagnosis information processing unit 1 includes: acquisition unit 101, comparison unit 102, generation unit 103, storage unit 104.

In this embodiment, the direct injection gasoline engine has a problem that coking is generated in the air inlet system pipeline adjacent to the air inlet valve due to poor tightness of the air inlet system pipeline or slow leakage of the heat exchange pipeline of the air inlet intercooler, and after the coking problem occurs, the combustion characteristic of the engine is affected, so that the engine operates under the condition of a specific working condition area, and knocking combustion phenomenon of the engine is caused by using a calibration control parameter data value preset in an electronic control unit of the engine in a product development stage. When knocking combustion phenomenon occurs, the electronic control unit of the engine delays a preset ignition advance angle by a corresponding angle (crank angle) according to a knocking signal acquired by the knocking sensor, so that a diagnosis program and a diagnosis method can be built in the electronic control unit of the vehicle engine, and aiming at the fact that the engine runs in a specific working condition area, the real-time delay angle value of the ignition advance angle caused by knocking of each cylinder of the engine is acquired, and the real-time delay angle value of the ignition advance angle caused by knocking of each cylinder of the engine is compared with a corresponding preset value, a preset condition or historical data information of the engine running condition, so that whether the coking problem exists in the current engine air inlet system pipeline can be diagnosed. In the implementation process of this embodiment, an electronic diagnostic device or a program built in the electronic control unit of the engine may be constructed, and this embodiment may be referred to as a "diagnostic information processing unit" in general.

The following describes in detail, with reference to fig. 2, the logical signal connection relationship and the working principle between the diagnostic information processing unit and other related systems or components of the vehicle and the electronic control unit of the engine in the detection system for coking of the air intake system of the internal combustion engine according to the present embodiment:

the diagnosis information processing unit 1 is used for collecting target working condition information of an engine of a target vehicle in the running process; determining a target diagnosis standard based on the historical data information under the condition that the target working condition information does not meet the preset standard state, or determining the target diagnosis standard as a first diagnosis standard under the condition that the target working condition information meets the preset standard state; comparing the target working condition information with preset information based on the target diagnosis standard to obtain a comparison result; and sending fault information to an engine electronic control unit under the condition that the comparison result indicates that the engine of the target vehicle has coking faults of an air inlet system pipeline.

In this embodiment, there is transmission of control or data signals between the diagnostic information processing unit 1 and the engine electronic control unit 2, the diagnostic information processing unit 1 is used to collect real-time working condition information of the engine and the engine electronic control unit 2 when the engine is operated in the diagnostic working condition area during the driving process of the vehicle (wherein, the collected information in the engine electronic control unit 2 is the processing process data or result data of the real-time working condition information of the engine), evaluate the validity of the real-time working condition information (i.e. whether the engine is operated in the diagnostic working condition area for a preset time period), compare with the preset information in the diagnostic information processing unit to obtain a comparison result, classify the real-time working condition information according to the difference of the comparison result and store the data, and meanwhile, when the comparison result meets the preset condition, generate a control instruction set, send fault information to the engine electronic control unit 2 to remind the user of the coking problem of the engine air inlet system caused by the liquid penetrating into the engine air inlet system, and remind the user to go to the designated maintenance place to perform fault treatment. In the present embodiment, the different sub-units in the diagnostic information processing unit 1 function as follows:

The acquisition unit 101 is part of a (logical or physical) component of the diagnostic information processing unit 1. There is a transmission of control or data signals between the acquisition unit 101 and the engine electronic control unit 2. The function of the acquisition unit 101 is to acquire real-time operating condition information of the engine and the engine electronic control unit 2 when the engine is operating in the diagnostic operating condition region during running of the vehicle.

The comparison unit 102 is part of a (logical or physical) component of the diagnostic information processing unit 1. There is a transmission of control or data signals between the comparing unit 102 and the acquisition unit 101, the generating unit 103, the storage unit 104. The comparing unit 102 is used for evaluating the effectiveness of the real-time working condition information of the engine when the engine runs in the diagnosis working condition area during the running process of the vehicle, and comparing the real-time working condition information with the preset information in the diagnosis information processing unit to obtain a comparison result.

The generation unit 103 belongs to one (logical or physical) component of the diagnostic information processing unit 1. There is a transmission of control or data signals between the generation unit 103 and the engine electronic control unit 2. The generating unit 103 is used for generating a control instruction set when the comparison result meets the preset condition, wherein the control instruction set is used for controlling the diagnosis information processing unit 1 to send fault information to the engine electronic control unit 2, reminding a user of the problem of coking of an engine air inlet system pipeline caused by liquid penetrating into the engine air inlet system, and reminding the user of going to a designated maintenance place to perform fault processing.

The memory unit 104 is part of one (logical or physical) component of the diagnostic information processing unit 1. There is a transmission of control or data signals between the memory unit 104 and the comparison unit 102. The storage unit 104 is used for receiving the data processed by the comparison unit 102, classifying the data according to the difference of the comparison results, and storing the data; meanwhile, during the data processing of the comparing unit 102, corresponding historical data information can be transmitted to the comparing unit 102 according to the requirement.

And the engine electronic control unit 2 is connected with the diagnosis information processing unit and is used for controlling the operation of the engine and each component thereof and receiving fault information, and adjusting the numerical value of each control parameter of the engine and each component thereof based on the fault information. The method comprises the following steps: there is a transmission of control or data signals between the engine electronic control unit 2 and the diagnostic information processing unit 1, the sensors 3, the actuators 4, the on-board information control display 5. The electronic engine control unit 2 is used for collecting data signals from the sensor 3 for describing real-time working condition information of the engine, and sending control signals to the actuator 4 through data processing and operation so as to control the engine and accessories thereof to normally operate under the condition of meeting the use requirements of vehicle users. In addition, the engine electronic control unit 2 transmits data signals describing real-time working condition information of the engine and components thereof to the vehicle-mounted information control display 5 according to the requirements of a vehicle user through control or data signal transmission with the vehicle-mounted information control display 5, and simultaneously receives instructions from the vehicle-mounted information control display 5, and adjusts operation control parameters of the engine and components thereof according to the requirements of the vehicle user.

There is a transmission of control or data signals between the sensor 3 and the engine electronic control unit 2, the on-board information control display 5. The sensor 3 is used for collecting data signals describing real-time working condition information of the engine, transmitting all the data signals to the engine electronic control unit 2, and transmitting part of the data signals to the vehicle-mounted information control display 5 according to the requirements of a vehicle user. The sensor 3 comprises at least one of the following: an engine knock sensor, an engine rotational speed phase sensor, an engine intake manifold pressure and temperature sensor, an engine boost pressure sensor, an engine intake air flow sensor, an engine oil pressure sensor, an engine coolant temperature sensor, a vehicle driver accelerator pedal opening sensor, and the like.

There is a transmission of control or data signals between the actuator 4 and the engine electronic control unit 2, the on-board information control display 5. The actuator 4 is operative to receive control signals from the engine electronic control unit 2 and the telematics control display 5 and to execute and perform corresponding programs or actions in accordance with the needs of the vehicle user. The actuator 4 includes at least one of: an engine throttle valve body actuator, an engine supercharging bypass valve body actuator, an engine ignition coil and a spark plug, an engine air intake system tumble ratio adjusting actuator, an engine water pump, an engine oil pump and the like.

There is a transmission of control or data signals between the telematics display 5 and the engine electronic control unit 2, the sensors 3, and the actuators 4. The in-vehicle information control display 5 may be a touch screen display or a Graphical User Interface (GUI). The on-vehicle information control display 5 is used for displaying part of the real-time working condition information necessary for describing the vehicle, the engine and the components thereof to the vehicle user, and at the same time, can receive various instructions expressed by operations (gestures, voices and the like) from the vehicle user, and transmit control signals to the engine electronic control unit 2 and the actuator 4 according to the requirements or the instructions of the vehicle user so as to execute and complete corresponding programs or actions.

Fig. 3 is a schematic diagram of a diagnostic flow of an alternative diagnostic information processing unit according to an embodiment of the present invention, as shown in fig. 3, comprising the steps of:

step S301: and acquiring real-time working condition information of the engine and the engine electronic control unit 2 when the engine runs in the diagnosis working condition area during running of the vehicle, wherein the real-time working condition information comprises at least one of the following components: real-time knock signal data of each cylinder of the engine, a real-time delay angle value of an ignition advance angle of each cylinder of the engine caused by knocking, a real-time ignition advance angle of the engine, a real-time rotating speed of the engine, a real-time relative air inflow of the engine, a real-time air inflow temperature of the engine, a real-time cooling liquid temperature of the engine, a real-time accelerator pedal opening signal of a vehicle driver and the like.

Step S302: and comparing the real-time working condition information of the engine when the engine runs in the diagnosis working condition area in the running process of the vehicle with preset information and historical data information in the diagnosis information processing unit 1 to obtain a comparison result, classifying according to the difference of the comparison result, and storing data. Wherein the preset information in the diagnostic information processing unit 1 includes at least one of: a lower limit threshold value of a difference value of a spark advance angle retardation angle value of one cylinder of the engine and other cylinders caused by knocking, a target air inlet temperature of the engine, a target cooling liquid temperature of the engine, an upper limit threshold value of an accelerator pedal opening signal when the vehicle is in a quasi-steady state running state, and the like.

Step S303: under the condition that the comparison result meets the diagnosis preset condition, a control instruction set is generated, and the control instruction set is used for controlling the diagnosis information processing unit 1 to send fault information to the engine electronic control unit 2, so that a user is reminded of the problem of coking of a pipeline of an engine air inlet system caused by liquid infiltration into the engine air inlet system, and the user is reminded of going to a designated maintenance place to perform fault treatment.

FIG. 4 is a schematic diagram of an alternative real-time condition information collection procedure according to an embodiment of the present invention, as shown in FIG. 4, including the following steps: after the flow starts, a judgment step SJ0401 is performed: is the engine electronic control unit in a "power-on" state? If the determination result is yes, step S0401 is executed: initializing a diagnostic information processing unit; executing a judging step SJ0402: determine whether the engine is in an "on" state? If the determination result is yes, step S0402 is executed: collecting real-time working condition information of an engine and an electronic control unit of the engine; executing a judging step SJ0403: determining whether the condition of "engine operating within the diagnostic operating region" is satisfied? If the determination result is yes, step S0403 is executed: accumulating time t_InDgConZonC continuously meeting the condition of 'engine operation in the diagnosis working condition area'; executing a judging step SJ0404: judging that t_indgconzonc is not less than t_indgconzonc_v_l? If the determination result is yes, step S0404 is executed: transmitting the collected real-time working condition information of the engine and the electronic control unit of the engine to a comparison unit; and returning to and sequentially executing the judging step SJ0401 and subsequent flow steps according to the steps of the acquisition flow.

After the flow starts, a judgment step SJ0401 is performed: is the engine electronic control unit 2 in a "power-on" state? If the determination result is yes, step S0401 is executed: initializing the diagnostic information processing unit 1; executing a judging step SJ0402: is the engine in an "on" state? If the determination result is yes, step S0402 is executed: collecting real-time working condition information of the engine and the engine electronic control unit 2; executing a judging step SJ0403: is the condition of "engine operating within the diagnostic operating region" met? If the determination result is yes, step S0403 is executed: accumulating time t_InDgConZonC continuously meeting the condition of 'engine operation in the diagnosis working condition area'; executing a judging step SJ0404: t_InDgConZonC is greater than or equal to t_InDgConZonC_V_L? If the judgment result is "no", returning and sequentially executing the judgment step SJ0403 and the subsequent flow steps according to the steps of the acquisition flow.

After the flow starts, a judgment step SJ0401 is performed: is the engine electronic control unit 2 in a "power-on" state? If the determination result is yes, step S0401 is executed: initializing the diagnostic information processing unit 1; executing a judging step SJ0402: is the engine in an "on" state? If the determination result is yes, step S0402 is executed: collecting real-time working condition information of the engine and the engine electronic control unit 2; executing a judging step SJ0403: is the condition of "engine operating within the diagnostic operating region" met? If the determination result is "no", step S0405 is executed: resetting the value of t_indgconzonc to 0; and returning to and sequentially executing the judging step S0402 and subsequent flow steps according to the steps of the acquisition flow.

After the flow starts, a judgment step SJ0401 is performed: is the engine electronic control unit 2 in a "power-on" state? If the determination result is yes, step S0401 is executed: initializing the diagnostic information processing unit 1; executing a judging step SJ0402: is the engine in an "on" state? If the judgment result is "no", returning and sequentially executing the judgment step SJ0401 and the subsequent flow steps according to the steps of the acquisition flow.

After the flow starts, a judgment step SJ0401 is performed: is the engine electronic control unit 2 in a "power-on" state? If the determination result is "no", step S0406 is executed: resetting all control variable values, and stopping all relevant functions of the diagnostic information processing unit 1; ending the flow.

Wherein the engine electronic control unit 2 being in a "power-on" state is represented as: under the condition that the engine electronic control unit 2 is in the state, a vehicle-mounted power supply (or a storage battery, or a vehicle-mounted power battery and the like) supplies stable voltage and electric energy for the engine electronic control unit 2 to meet the normal operation of the engine electronic control unit, and part of communication functions and diagnosis functions of the engine electronic control unit 2 can keep normal operation.

The initialization diagnostic information processing unit 1 is represented as: the diagnostic information processing unit 1 is started and brought into a normal operating state. In the initialization process of the diagnostic information processing unit 1, the data communication function between the diagnostic information processing unit 1 and the electronic engine control unit 2 needs to be successfully established and checked, the data communication function between the internal logic components (the acquisition unit 101, the comparison unit 102, the generation unit 103, and the storage unit 104) of the diagnostic information processing unit 1 needs to be successfully established and checked, and the relevant fault flag bit of the diagnostic information processing unit 1 is reset and the fault checking function is restarted.

The engine being in an "on" state is represented as: under the condition that the engine is in the state, the engine electronic control unit 2 sends out an engine ignition signal, the engine rotating speed can be stabilized and kept above the normal operation lower limit threshold value n_Eng_V_L of the engine (the value of n_Eng_V_L can be selected according to the types of different engines, for example, different values of n_Eng_V_L are required to be selected for the special engine type of a hybrid electric vehicle, the alternative fuel engine type and the traditional fuel engine type, and n_Eng_V_L=300 r/min can be selected for the traditional fuel engine type).

t_indgconzonc is expressed as: the accumulated time for continuously satisfying the condition of "the engine is operated in the diagnostic operating condition region".

t_indgconzonc_v_l is expressed as: the lower threshold value of the condition accumulation time of the "engine operating in the diagnostic condition region" is effectively and continuously satisfied by the presets in the diagnostic information processing unit 1.

Resetting all control variable values is expressed as: the variable values describing the failure in all the diagnostic information processing units 1 are reset (or reset), and the control variable values in all the diagnostic information processing units 1 are reset (or reset).

FIG. 5 is a schematic diagram of an alternative real-time operating condition information comparison flow according to an embodiment of the present invention, as shown in FIG. 5, including the following steps:

After the flow starts, step S0501: reading preset information in the diagnostic information processing unit 1; step S0502 is performed: receiving real-time working condition information of the engine and the electronic engine control unit 2 acquired by the acquisition unit 101; executing a judging step SJ0501: whether the engine real-time operating condition information satisfies the "standard state"? If the determination result is yes, step S0503 is executed: comparing the real-time working condition information with preset information according to a first diagnosis standard; step S0504: find the comparison result and transmit the comparison result to the generation unit 103; ending the flow.

After the flow starts, step S0501: reading preset information in the diagnostic information processing unit 1; step S0502 is performed: receiving real-time working condition information of the engine and the electronic engine control unit 2 acquired by the acquisition unit 101; executing a judging step SJ0501: whether the engine real-time operating condition information satisfies the "standard state"? If the determination result is "no", step S0505 is executed: reading and searching historical data information in the diagnosis information processing unit 1; executing a judging step SJ0502: whether the engine working condition relativity can be searched and obtained: high "history data information? If the determination result is yes, step S0506 is executed: comparing the real-time working condition information with preset information according to a second diagnosis standard; step S0504: find the comparison result and transmit the comparison result to the generation unit 103; ending the flow.

After the flow starts, step S0501: reading preset information in the diagnostic information processing unit 1; step S0502 is performed: receiving real-time working condition information of the engine and the electronic engine control unit 2 acquired by the acquisition unit 101; executing a judging step SJ0501: whether the engine real-time operating condition information satisfies the "standard state"? If the determination result is "no", step S0505 is executed: reading and searching historical data information in the diagnosis information processing unit 1; the judgment step S0502: whether the engine working condition relativity can be searched and obtained: high "history data information? If the determination result is "no", the determination step SJ0503 is executed: whether the engine working condition relativity can be searched and obtained: is "history data information? If the determination result is yes, step S0507 is executed: comparing the real-time working condition information with preset information according to a third diagnosis standard; step S0504: find the comparison result and transmit the comparison result to the generation unit 103; ending the flow.

After the flow starts, step S0501: reading preset information in the diagnostic information processing unit 1; step S0502 is performed: receiving real-time working condition information of the engine and the electronic engine control unit 2 acquired by the acquisition unit 101; executing a judging step SJ0501: whether the engine real-time operating condition information satisfies the "standard state"? If the determination result is "no", step S0505 is executed: reading and searching historical data information in the diagnosis information processing unit 1; executing a judging step SJ0502: whether the engine working condition relativity can be searched and obtained: high "history data information? If the determination result is "no", the determination step SJ0503 is executed: whether the engine working condition relativity can be searched and obtained: is "history data information? If the determination result is "no", step S0508 is executed: comparing the real-time working condition information with preset information according to a fourth diagnosis standard; step S0509 is performed: transmitting the real-time working condition information of the engine acquired by the diagnosis information processing unit 1 and the engine electronic control unit 2 to the storage unit 104; step S0504: find the comparison result and transmit the comparison result to the generation unit 103; ending the flow.

FIG. 6 is a schematic diagram of an alternative instruction generation flow, as shown in FIG. 6, according to an embodiment of the invention, including the steps of:

after the flow starts, step S0601 is performed: reading a diagnosis preset condition in the diagnosis information processing unit 1; step S0602 is performed: receiving the comparison result transmitted by the comparison unit 103; executing a judging step SJ0601: is the comparison result satisfying the diagnostic preset condition? If the determination result is yes, step S0603 is executed: the generating unit 103 generates a control instruction set, sends fault information to the engine electronic control unit 2, reminds a user of the problem of coking of an engine air inlet system pipeline caused by liquid infiltration into the engine air inlet system, and reminds the user to go to a designated maintenance place for fault treatment; ending the flow.

After the flow starts, step S0601 is performed: reading a diagnosis preset condition in the diagnosis information processing unit 1; step S0602 is performed: receiving the comparison result transmitted by the comparison unit 103; executing a judging step SJ0601: is the comparison result satisfying the diagnostic preset condition? If the determination result is "no", step S0604 is executed: the generation unit 103 generates a control instruction set, and transmits a signal indicating "diagnosis result" to the engine electronic control unit 2: data information of failure not found; ending the flow.

In the present embodiment, the diagnosis preset condition is expressed as: after comparing the data information describing the real-time working condition of the engine acquired by the diagnostic information processing unit 1 with the preset information and the historical data information in the diagnostic information processing unit 1, whether the compared judging result is that coking exists in the pipeline of the air inlet system of the engine or not is obtained.

The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims

1. The method for detecting the coking of the pipeline of the air inlet system of the internal combustion engine is characterized by comprising the following steps of:

collecting target working condition information of an engine of a target vehicle in the running process;

under the condition that the target working condition information meets a preset standard state, determining a target diagnosis standard as a first diagnosis standard; or alternatively, the process may be performed,

determining a target diagnosis standard based on historical data information under the condition that the target working condition information does not meet a preset standard state, wherein the target diagnosis standard is a second diagnosis standard, a third diagnosis standard or a fourth diagnosis standard, and the third diagnosis standard is divided into: a third non-stringent diagnostic criterion, a third stringent diagnostic criterion;

based on the target diagnosis standard, comparing the target working condition information with preset information to obtain a comparison result, wherein the preset information comprises: the engine target working condition information meets the judgment standard of a preset standard state, the correlation degree judgment standard of the engine target working condition information and historical data information, the first diagnosis standard, the second diagnosis standard, the third diagnosis standard, the fourth diagnosis standard, the working condition area judged by enabling an engine diagnosis function, the first ignition advance angle delay angle lower limit threshold value, the second ignition advance angle delay angle lower limit threshold value, the third ignition advance angle delay angle lower limit threshold value, the engine target air inlet temperature corresponding to the target working condition information and the engine target cooling liquid temperature corresponding to the target working condition information, wherein the engine target working condition information meets the judgment standard of the preset standard state: the absolute value of the difference between the engine coolant temperature value in the target working condition information and the preset engine target coolant temperature is smaller than a preset standard state engine coolant temperature value deviation lower limit threshold value, and the absolute value of the difference between the engine air inlet temperature value in the target working condition information and the preset engine target air inlet temperature is smaller than a preset standard state engine air inlet temperature value deviation lower limit threshold value; the first diagnosis standard is that the ignition advance angle retardation value of each cylinder of the engine is compared with a first ignition advance angle retardation lower limit threshold; the second diagnosis standard is to compare the ignition advance angle retardation angle value of each cylinder of the engine with the latest ignition advance angle retardation angle value of each cylinder of the engine in the history working condition information indicated by the first relativity; the third non-strict diagnosis standard is that the ignition advance angle retardation angle value of each cylinder of the engine is compared with the latest ignition advance angle retardation angle value of each cylinder of the engine in the history working condition information indicated by the second correlation degree; the third strict diagnosis standard is that the ignition advance angle retardation angle value of each cylinder of the engine is compared with a second ignition advance angle retardation lower limit threshold value; the fourth diagnosis standard is that the ignition advance retardation angle value of each cylinder of the engine is compared with a third ignition advance retardation angle lower limit threshold, wherein the second ignition advance retardation angle lower limit threshold is the sum of the latest ignition advance retardation angle value of each cylinder of the engine and a preset strict addition angle value in the history working condition information indicated by the second correlation, and the influence factor of the preset strict addition angle value comprises at least one of the following: engine coolant temperature, engine intake temperature;

And outputting fault information under the condition that the comparison result indicates that the engine of the target vehicle has coking faults of an air inlet system pipeline.

2. The method according to claim 1, wherein the step of collecting target condition information of an engine of the target vehicle during traveling includes:

collecting all working condition information of an engine of the target vehicle in the running process;

determining an engine working condition area of the engine based on a preset detection working condition area, wherein the engine working condition area is a working condition area judged by enabling an engine diagnosis function;

screening out the target working condition information of which the time length of the engine running in the working condition area of the engine is longer than a preset time length threshold value from all the working condition information, wherein the target working condition information comprises at least one of the following components: knock signal data for each cylinder of the engine, a spark advance angle retard angle value for each cylinder of the engine, an engine spark advance angle, an engine speed, a relative load of the engine, an engine intake air temperature, an engine coolant temperature, and a vehicle accelerator opening signal.

3. The method of claim 1, wherein determining a target diagnostic criteria based on the historical data information comprises:

Determining the correlation between the history working condition information in the history data information and the target working condition information;

determining the target diagnosis standard as a second diagnosis standard under the condition that the correlation degree is a first correlation degree;

determining that the target diagnostic criteria is a third diagnostic criteria if the correlation is a second correlation, wherein the third diagnostic criteria is divided into a third strict diagnostic criteria and a third non-strict diagnostic criteria;

and determining that the target diagnosis standard is a fourth diagnosis standard in the case that the correlation degree is the third correlation degree.

4. The detection method according to claim 3, characterized in that the step of determining a correlation between the history condition information in the history data information and the target condition information includes:

obtaining an engine speed value, an engine air inlet temperature value and an engine coolant temperature value in the history working condition information, and obtaining variables and values describing engine load in the history working condition information, wherein the variables and values describing the engine load comprise at least one of the following: engine relative load, engine intake air flow, engine intake manifold pressure, engine boost pressure;

And determining the relevance by adopting a preset relevance strategy based on the engine speed value, the engine air inlet temperature value, the engine coolant temperature value, the variables and values describing the engine load and the target working condition information in the history working condition information.

5. The detection method according to claim 3, wherein, in the case where the correlation is the second correlation, after determining that the target diagnostic criterion is the third diagnostic criterion, further comprising:

executing the third non-rigorous diagnostic criteria if the engine intake air temperature value in the target operating condition information is higher than the engine intake air temperature value in the history operating condition information indicated by the second correlation, or if the engine coolant temperature value in the target operating condition information is higher than the engine coolant temperature value in the history operating condition information indicated by the second correlation;

the third strict diagnostic criteria is performed if the engine intake air temperature value in the target operating condition information is lower than the engine intake air temperature value in the history operating condition information indicated by the second correlation, and if the engine coolant temperature value in the target operating condition information is lower than the engine coolant temperature value in the history operating condition information indicated by the second correlation.

6. A system for detecting coking of an air intake system pipeline of an internal combustion engine, comprising:

the diagnosis information processing unit is used for collecting target working condition information of the engine of the target vehicle in the running process; under the condition that the target working condition information meets a preset standard state, determining a target diagnosis standard as a first diagnosis standard; or under the condition that the target working condition information does not meet the preset standard state, determining a target diagnosis standard based on the historical data information, wherein the target diagnosis standard is a second diagnosis standard, a third diagnosis standard or a fourth diagnosis standard, and the third diagnosis standard is divided into: a third non-stringent diagnostic criterion, a third stringent diagnostic criterion; based on the target diagnosis standard, comparing the target working condition information with preset information to obtain a comparison result, wherein the preset information comprises: the engine target working condition information meets the judgment standard of a preset standard state, the correlation degree judgment standard of the engine target working condition information and historical data information, the first diagnosis standard, the second diagnosis standard, the third diagnosis standard, the fourth diagnosis standard, the working condition area judged by enabling an engine diagnosis function, the first ignition advance angle delay angle lower limit threshold value, the second ignition advance angle delay angle lower limit threshold value, the third ignition advance angle delay angle lower limit threshold value, the engine target air inlet temperature corresponding to the target working condition information and the engine target cooling liquid temperature corresponding to the target working condition information, wherein the engine target working condition information meets the judgment standard of the preset standard state: the absolute value of the difference between the engine coolant temperature value in the target working condition information and the preset engine target coolant temperature is smaller than a preset standard state engine coolant temperature value deviation lower limit threshold value, and the absolute value of the difference between the engine air inlet temperature value in the target working condition information and the preset engine target air inlet temperature is smaller than a preset standard state engine air inlet temperature value deviation lower limit threshold value; the first diagnosis standard is that the ignition advance angle retardation value of each cylinder of the engine is compared with a first ignition advance angle retardation lower limit threshold; the second diagnosis standard is to compare the ignition advance angle retardation angle value of each cylinder of the engine with the latest ignition advance angle retardation angle value of each cylinder of the engine in the history working condition information indicated by the first relativity; the third non-strict diagnosis standard is that the ignition advance angle retardation angle value of each cylinder of the engine is compared with the latest ignition advance angle retardation angle value of each cylinder of the engine in the history working condition information indicated by the second correlation degree; the third strict diagnosis standard is that the ignition advance angle retardation angle value of each cylinder of the engine is compared with a second ignition advance angle retardation lower limit threshold value; the fourth diagnosis standard is that the ignition advance retardation angle value of each cylinder of the engine is compared with a third ignition advance retardation angle lower limit threshold, wherein the second ignition advance retardation angle lower limit threshold is the sum of the latest ignition advance retardation angle value of each cylinder of the engine and a preset strict addition angle value in the history working condition information indicated by the second correlation, and the influence factor of the preset strict addition angle value comprises at least one of the following: engine coolant temperature, engine intake temperature; under the condition that the comparison result indicates that the engine of the target vehicle has coking faults of an air inlet system pipeline, fault information is sent to an engine electronic control unit;

And the engine electronic control unit is connected with the diagnosis information processing unit and used for controlling the operation of the engine and each component thereof, receiving the fault information and adjusting the numerical value of each control parameter of the engine and each component thereof based on the fault information.

7. A vehicle comprising an on-board electronic control unit, wherein the on-board electronic control unit is configured to perform the method for detecting coking of an intake system pipe of an internal combustion engine according to any one of claims 1 to 5.

8. A vehicle-mounted readable storage medium, characterized in that the vehicle-mounted readable storage medium comprises a stored computer program, wherein the device in which the vehicle-mounted readable storage medium is located is controlled to execute the method for detecting the coking of the air inlet system pipeline of the internal combustion engine according to any one of claims 1 to 5 when the computer program runs.