CN114962031A

CN114962031A - Method and system for detecting pipeline coking of air intake system of internal combustion engine and vehicle

Info

Publication number: CN114962031A
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: 2022-08-30
Anticipated expiration: 2042-06-08
Also published as: CN114962031B

Abstract

The invention discloses a method for detecting coking of pipelines of an air intake system of an internal combustion engine, a system and a vehicle thereof, wherein the method comprises the following steps: the method comprises the steps of collecting target working condition information of an engine of a target vehicle in the running process, determining a target diagnosis standard on the basis of 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 to be a first diagnosis standard on the basis of the target 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 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 low reliability of the engine caused by the fact that the coking fault of the pipeline of the air intake system of the engine cannot be detected in real time in the related technology.

Description

Method and system for detecting pipeline coking of air intake 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 pipeline coking of an air intake system of an internal combustion engine and a vehicle.

Background

At present, directly spout gasoline engine by the wide application, when directly spouting gasoline engine's air intake system gas line leakproofness is bad or the air intake intercooler heat transfer pipeline has slow seepage, can lead to the air intake system pipeline that closes on intake valve department to produce the problem of coking, and the air intake system pipeline produces the burning characteristic that the coking can influence the engine to and influence the operation stationarity of whole car.

In the related art, the method for diagnosing coking of the engine intake system pipeline comprises the following steps: (1) disassembling an air inlet system pipeline of the engine for visual inspection; (2) installing additional test instruments (e.g., humidity sensors, etc.) in the intake system piping of the engine; (3) the engine is controlled to operate under a special operating condition preset in an electronic control unit of the engine, and a current corresponding sensor signal is acquired and compared with data preset in the electronic control unit of the engine to judge whether coking exists in a pipeline of an air inlet system of the engine. For example, a test method based on a specific engine operating condition is used twice, an actual measurement value of the air-fuel ratio of the engine and a control target value acquired in the two tests are used, data processing is carried out by using a certain calculation method, and the actual measurement value and the control target value are used as the basis for identifying whether coking exists in an air inlet channel of the internal combustion engine. However, the method needs to control the engine to operate under a special operating condition in a special application scene, requires operators to have certain professional technical knowledge and certain space-time limitations, and cannot detect whether the pipeline coking problem exists in an air inlet system of the engine in real time, so that the reliability of the engine is low.

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

Disclosure of Invention

The embodiment of the invention provides a method, a system and a vehicle for detecting coking of pipelines of an air intake system 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 pipelines of the air intake system of the engine cannot be detected in real time in the related technology.

According to an aspect of the embodiments of the present invention, there is provided a method for detecting coking in an intake system pipe of an internal combustion engine, including: acquiring 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 to be 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 the coking fault of the air intake system pipeline.

Optionally, the step of acquiring target operating condition information of the engine of the target vehicle during driving 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 which can be judged by 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 greater than a preset time length threshold from all the working condition information, wherein the target working condition information comprises at least one of the following: the engine comprises knock signal data of each cylinder of the engine, ignition advance angle postponing values of each cylinder of the engine, an engine ignition advance angle, engine speed, engine air inlet quantity, engine air inlet temperature, engine coolant temperature and a vehicle accelerator pedal opening signal.

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

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

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

Optionally, the first diagnostic criterion is that the ignition advance angle retard value of each cylinder of the engine is compared with a first ignition advance angle retard lower threshold; the second diagnosis standard is to compare the ignition advance angle delay angle value of each cylinder of the engine with the ignition advance angle delay angle value of each cylinder of the engine in the historical working condition information indicated by the first correlation degree; the third non-strict diagnostic standard is to compare the ignition advance angle delay value of each cylinder of the engine with the ignition advance angle delay value of each cylinder of the engine in the historical working condition information indicated by the second correlation degree; the third strict diagnosis standard is that the ignition advance angle postponing angle value of each cylinder of the engine is compared with a second ignition advance angle postponing angle lower limit threshold; the fourth diagnostic criterion is to compare the ignition advance angle postponed value of each cylinder of the engine with a third ignition advance angle postponed lower threshold, where the second ignition advance angle postponed lower threshold is the sum of the latest ignition advance angle postponed value of each cylinder of the engine in the historical working condition information indicated by the second correlation and a preset strict addition angle value, and an influence factor of the preset strict addition angle value includes at least one of: engine coolant temperature, engine intake air 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 judgment standard of the engine target working condition information and historical data information, a first diagnosis standard, a second diagnosis standard, a third diagnosis standard, a fourth diagnosis standard, a working condition region which can be judged by 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 and an engine target cooling liquid temperature corresponding to the target working condition information, wherein the judgment standard that the engine target working condition information meets the preset standard state is as follows: the absolute value of the difference value 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 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 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 embodiments of the present invention, there is also provided a system for detecting coking in a pipeline of an intake system of an internal combustion engine, including: the diagnostic information processing unit is used for acquiring 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 to be 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; sending fault information to an electronic engine control unit under the condition that the comparison result indicates that the engine of the target vehicle has an intake system pipeline coking fault; and the engine electronic control unit is connected with the diagnostic information processing unit and is used for controlling the operation of the engine and each component thereof, receiving the fault information and adjusting the control parameter values 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 an on-board electronic control unit, wherein the on-board electronic control unit is used for executing the method for detecting the coking of the pipelines of the air intake system of the internal combustion engine.

According to another aspect of the embodiment of the invention, a vehicle-mounted readable storage medium is further provided, and the vehicle-mounted readable storage medium comprises a stored computer program, wherein when the computer program runs, the device on which the vehicle-mounted readable storage medium is controlled to execute the method for detecting coking of the pipeline of the air intake system of the internal combustion engine.

The method comprises the steps of collecting target working condition information of an engine of a target vehicle in the running process, determining a target diagnosis standard on the basis of 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 to be 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 on the basis of 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 pipelines of an air intake system. According to the method and the device, the target working condition information of the engine of the target vehicle in the running process can be collected, the target diagnosis standard is determined based on historical data information, then the target working condition information and the preset information can be compared according to the target diagnosis standard, fault information is output under the condition that the comparison result indicates that the engine has pipeline coking faults, and a user is reminded of the problem that the engine has the pipeline coking in time, 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 low due to the fact that the pipeline coking faults of an air intake 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 embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

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

FIG. 2 is a schematic diagram of an alternative engine induction system pipe coking detection system in accordance with an embodiment of the present invention;

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

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

FIG. 5 is a schematic diagram of an alternative real-time condition information comparison process according to an embodiment of the invention;

FIG. 6 is a schematic diagram of an alternative instruction generation flow according to an embodiment of the invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and any other variation 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 embodiments of the invention described below can be applied to various application scenarios for detecting coking of pipelines of an engine air intake system. The invention can embed a created diagnosis program and a diagnosis method in an electronic control unit of an engine for a vehicle, receives signals acquired by the electronic control unit of the engine and a sensor when the engine is in a preset operation working condition, processes and stores the signals to be used as a basis for diagnosing the coking of a pipeline of an air intake system of the engine caused by abnormal liquid infiltration, and judges whether the coking fault exists in the pipeline of the air intake system of the engine at present by comparing the signals acquired by the electronic control unit of the engine and the sensor at present with historical engine operation working condition data stored by the diagnosis program or the diagnosis module.

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

Example one

In accordance with an embodiment of the present invention, there is provided an embodiment of a method for detecting coking in intake system conduits of an internal combustion engine, wherein the steps illustrated in the flowchart of the accompanying drawings may be executed on a computer system, such as a set of computer-executable instructions, and wherein although a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be executed in an order different than that illustrated herein.

FIG. 1 is a flow chart of an alternative method for detecting coking in intake system conduits of an internal combustion engine, as shown in FIG. 1, comprising the steps of:

and step S101, acquiring target working condition information of an engine of a target vehicle in the running process.

And step S102, 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 to be a first diagnosis standard under the condition that the target working condition information meets the preset standard state.

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

And step S104, outputting fault information under the condition that the comparison result indicates that the engine of the target vehicle has the coking fault of the air intake system pipeline.

Through the steps, the target working condition information of the engine of the target vehicle in the running process can be collected, the target diagnosis standard is determined based on 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 and the preset information are compared based on the target diagnosis standard to obtain a comparison result, and the fault information is output under the condition that the comparison result indicates that the engine of the target vehicle has coking faults of the air inlet system pipeline. In the embodiment of the invention, the target working condition information of the engine of the target vehicle in the running process can be collected, 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 a user is reminded of the problem of pipeline coking of the engine in time, 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 because the pipeline coking faults of an air intake system of the engine cannot be detected in real time in the related technology is solved.

The following will explain the embodiments of the present invention in detail with reference to the above steps.

Optionally, the step of acquiring target working condition information of an engine of the target vehicle in the driving process includes: collecting all working condition information of an engine of a 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 which can be judged by an engine diagnosis function; screening target working condition information of which the time length of the engine running in the working condition area of the engine is greater 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: the engine comprises knock signal data of each cylinder of the engine, ignition advance angle postponing values of each cylinder of the engine, an engine ignition advance angle, engine speed, engine air inlet quantity, engine air inlet temperature, engine coolant temperature and a vehicle accelerator pedal opening signal.

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

In this embodiment, the target operating condition information includes at least one of: the method comprises the steps of real-time knocking signal data of each cylinder of the engine, real-time ignition advance angle retarding numerical values of each cylinder of the engine caused by knocking, real-time ignition advance angles of the engine, real-time engine rotating speed, real-time relative engine air inflow, real-time engine air inflow temperature, real-time engine cooling liquid temperature, real-time accelerator pedal opening signals of a vehicle driver and the like.

In this embodiment, the knocking of each cylinder of the engine refers to abnormal combustion of the gasoline engine under certain conditions (e.g., the compression ratio is too high), the pressure curve has high frequency and large fluctuation, and the flame propagation speed and the flame front shape are changed sharply, which is called knocking, and the knocking is an external reaction of the knocking.

In the present embodiment, in order to obtain the maximum power possible in the gasoline engine after the compression stroke is ended, the ignition coil and the spark 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 ignition delay period).

In this embodiment, the accelerator pedal is also called an accelerator pedal and is used for expressing the acceleration demand of a user on the vehicle and the torque demand of the engine, and the electronic engine control unit controls the opening of a throttle valve of the gasoline engine and control parameters related to the supercharger according to the value of an 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 operating condition region is a preset engine intake system coking diagnosis operating condition region, and there are various preset methods for the engine intake system coking diagnosis operating condition region, and this embodiment is described by the following examples: (1) the region can be an engine operation condition region determined by an engine air inlet system coking diagnosis rotating speed lower limit threshold, an engine air inlet system coking diagnosis rotating speed upper limit threshold, an engine air inlet system coking diagnosis load lower limit threshold and an engine air inlet system coking diagnosis load upper limit threshold; (2) the region can be an engine operation condition region described by a series of engine air inlet system coking diagnosis rotating speed arrays, and relative air inlet system coking diagnosis engine lower limit threshold and relative air inlet system upper limit threshold corresponding to each engine air inlet system coking diagnosis rotating speed value, or an engine air inlet system coking diagnosis load lower limit threshold and an engine air inlet system coking diagnosis load upper limit threshold corresponding to each engine air inlet system coking diagnosis rotating speed value. Wherein, the coking diagnosis load of the engine air intake system can be represented or replaced by the engine torque (or the relative air intake quantity of the engine, the air intake flow of the engine, the pressure of an air intake manifold of the engine, the load rate and the like), the coking diagnosis lower limit threshold of the engine air intake system, the coking diagnosis upper limit threshold of the engine air intake system, the coking diagnosis lower limit threshold of the engine air intake system, the coking diagnosis upper limit threshold of the engine air intake system (or a series of coking diagnosis rotating speed arrays of the engine air intake system, and the relative air intake quantity lower limit threshold and the coking diagnosis upper limit threshold of the engine air intake system corresponding to the coking diagnosis rotating speed value of each engine air intake system), or the coking diagnosis lower limit threshold of the engine air intake system corresponding to the coking diagnosis rotating speed value of each engine air intake system, and the coking diagnosis upper limit threshold of the engine air intake system can select different values aiming at different engine models, the present embodiment is not limited thereto.

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

TABLE 1

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

Step S102, under the condition that the target working condition information does not meet the preset standard state, the target diagnosis standard is determined based on the historical data information, or under the condition that the target working condition information meets the preset standard state, the target diagnosis standard is determined to be the first diagnosis standard.

An optional embodiment may be that, after target working condition information of an engine of a target vehicle in a driving process is collected, whether the target working condition information meets a preset standard state is judged, and when the target working condition information meets the preset standard state, the target diagnostic standard may be directly determined to be a first diagnostic standard, where the preset standard state indicates that a value of a parameter variable of an engine working state is equal to a standard value of a working condition parameter variable of a preset engine operating working condition point or is within a preset value range of the standard value, and the first diagnostic standard is to compare a value of an ignition advance angle retard angle of each cylinder of the engine with a lower threshold of the first ignition advance angle retard angle.

In the embodiment of the present invention, the preset standard state may be expressed as an engine operating condition "standard state", the real-time values of the parameters describing the working state of the engine, such as the real-time intake air temperature of the engine, the real-time coolant temperature of the engine (also including the real-time intake air 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), can be expressed specifically to be equal to the corresponding standard (or reference) values describing the parameters describing the working condition of the engine aiming at the real-time operating working points of the engine (including the real-time rotating speed value of the engine and the real-time load value of the engine, wherein the real-time load value of the engine can be represented or replaced by the real-time relative intake air quantity of the engine, the real-time intake air flow of the engine and the real-time intake manifold pressure value of the engine) or be within the preset value range of the standard (or reference) values. In this embodiment, the standard (or reference) value and the preset value range may be preset or set by an engine electronic control data calibration engineer in an engine electronic control data calibration development stage, or may be updated on-line in an Over-the-Air Technology (OTA) vehicle commissioning stage by using a wireless network communication manner (which may use a wireless network or a vehicle networking manner or medium provided by a communication provider), without limitation.

The first diagnostic criterion may be specifically expressed as: if the algebraic value of the ignition advance angle real-time retarding angle value IAC _ KnkRtd _ a caused by knocking of each cylinder of the engine is less than or equal to the algebraic value of the first ignition advance angle retarding angle lower limit threshold value IAC _ KnkRtd _ C01_ V _ L (namely IAC _ KnkRtd _ a is less than or equal to IAC _ KnkRtd _ C01_ V _ L), the judgment result is as follows: the problem of coking of pipelines of an air inlet system of the engine is solved; if the algebraic value of the ignition advance angle real-time retarding angle value IAC _ KnkRtd _ a caused by knocking of each cylinder of the engine is larger than the algebraic value of the first ignition advance angle retarding angle lower limit threshold IAC _ KnkRtd _ C01_ V _ L (namely IAC _ KnkRtd _ a > IAC _ KnkRtd _ C01_ V _ L), the judgment result is as follows: the problem of coking of pipelines of an air inlet system of the engine is not found. For example, the first ignition timing retard angle lower limit threshold value IAC _ knktrd _ C01_ V _ L may be selected to be-2 ° CA (CA represents crank angle degrees, -2 ° CA represents ignition timing retard by 2 crank angle degrees with respect to the engine operating condition in the post-calibration preset electric control data).

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

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

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

In the embodiment of the present invention, the correlation between the historical operating condition information and the target operating condition information (i.e. the engine operating condition correlation) is specifically expressed as: the similarity degree of the engine real-time working condition (namely target working condition information) and the engine operating working condition (namely historical working condition information) in the searched historical data information of the engine operating working condition, and variables which represent the similarity degree and describe the engine operating working condition comprise at least one of the following variables: 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 be judged according to different similar degrees, and the fact that the real-time working condition of the engine is high or the engine working condition is medium or the engine working condition is low compared with the searched historical data information of the engine running working condition is judged.

In this embodiment, the engine speed value, the engine intake air temperature value, the engine coolant temperature value in the historical operating condition information, and the variable and value describing the engine load in the historical operating condition information may be obtained first, where the variable and value describing the engine load includes at least one of: the method comprises the steps of determining the degree of correlation by adopting a preset degree of correlation strategy according to an engine rotating speed value, an engine load, an engine inlet air temperature value, an engine coolant temperature value, a variable and a value for describing the engine load and target working condition information. The preset relevancy policy in this embodiment includes: the engine working condition correlation degree is high, the engine working condition correlation degree is medium, and the like, specifically:

determination conditions under which the degree of correlation of the engine operating condition is high: the following determination conditions need to be satisfied simultaneously: comparing the real-time working condition of the engine with the working condition of the engine in the historical data information of the working condition of the engine obtained by searching, wherein the working condition which is equal to the real-time rotating speed of the engine (or the difference of the rotating speed is less than or equal to a preset threshold (such as 50r/min)) exists in the historical data information of the working condition of the engine obtained by searching; and the absolute value of the relative difference value between the real-time engine load value in the working condition and the engine load value of the corresponding working condition in the historical data information of the engine running working condition obtained by searching is less than or equal to a preset threshold (such as 5 percent); and the absolute value of the difference value between the real-time air inlet temperature of the engine under the working condition and the air inlet temperature value of the engine under the corresponding working condition in the historical data information of the running working condition of the engine obtained by searching is less than or equal to a preset threshold (for example, 5 ℃); and the absolute value of the difference value between the real-time engine coolant temperature in the working condition and the engine coolant temperature value of the corresponding working condition in the searched historical data information of the engine running working condition is less 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 difference of the application scenarios of the products and the difference of the functions of the products, which is not limited herein.

Judging conditions that the correlation degree of the engine working condition is middle: the following determination conditions need to be satisfied simultaneously: firstly, judging conditions with high correlation degree of engine working conditions are not required to be met; comparing the real-time working condition of the engine with the engine running working condition in the historical data information of the engine running working condition obtained by searching, wherein the historical data information of the engine running working condition obtained by searching has the working condition which is equal to the real-time rotating speed of the engine (or the difference of the rotating speed is less than or equal to a preset threshold (such as 50 r/min)); and the absolute value of the relative difference value between the real-time engine load value in the working condition and the engine load value of the corresponding working condition in the searched historical engine operating condition data information is less 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 difference of the application scenarios of the products and the difference of the functions of the products, which is not limited herein.

In the present 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 searched historical operating condition information is low in similarity with the target operating condition information according to the historical data information, the target operating condition information may be classified and stored.

Optionally, when 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 when the engine intake air temperature value in the target operating condition information is higher than the engine intake air temperature value in the historical operating condition information indicated by the second degree of correlation, or when the engine coolant temperature value in the target operating condition information is higher than the engine coolant temperature value in the historical operating condition information indicated by the second degree of correlation; the third stringent diagnostic criterion is executed where the engine intake air temperature value in the target operating condition information is lower than the engine intake air temperature value in the historical operating condition information indicated by the second degree of correlation, and where the engine coolant temperature value in the target operating condition information is lower than the engine coolant temperature value in the historical operating condition information indicated by the second degree of correlation.

In the embodiment of the invention, the third diagnostic standard can be divided into two sub-diagnostic standards according to the severity comparison result of the engine operating condition with the medium engine condition correlation (namely, the correlation is the second correlation) obtained by searching the real-time engine condition: respectively, a third stringent diagnostic criterion and a third non-stringent diagnostic criterion. If the real-time working condition of the engine is worse than the engine running working condition of the second correlation degree obtained by searching, executing a third non-strict diagnosis standard (namely, under the condition that the engine air inlet temperature value in the target working condition information is higher than the engine air inlet temperature value in the historical working condition information indicated by the second correlation degree, or under the condition that the engine coolant temperature value in the target working condition information is higher than the engine coolant temperature value in the historical working condition information indicated by the second correlation degree, executing the third non-strict diagnosis standard); and if the engine operation condition of the second degree of correlation is worse than the real-time engine condition, executing a third strict diagnosis standard (namely, executing the third strict diagnosis standard under the condition that the engine air inlet temperature value in the target condition information is lower than the engine air inlet temperature value in the historical condition information indicated by the second degree of correlation, and under the condition that the engine coolant temperature value in the target condition information is lower than the engine coolant temperature value in the historical condition information indicated by the second degree of correlation).

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

In an embodiment of the present invention, the second diagnostic criterion may be defined as: if the algebraic value of the ignition advance angle real-time retardation angle value IAC _ KnkRtd _ a caused by knocking of each cylinder of the engine is smaller than or equal to the algebraic value of the ignition advance angle value IAC _ KnkRtd _ HscDat _ Wst caused by knocking of each cylinder of the engine in the engine operation condition historical data information of which the correlation degree of the engine operation condition is high (namely IAC _ KnkRtd _ a is smaller than or equal to IAC _ KnkRtd _ HscDat _ Wst), the judgment result is that: the problem of coking of pipelines of an air inlet system of the engine is solved; if the algebraic value of the ignition advance angle real-time retarding angle value IAC _ KnkRtd _ a caused by knocking of each cylinder of the engine is larger than the algebraic value of the ignition advance angle latest retarding angle value IAC _ KnkRtd _ HscDat _ Wst caused by knocking of each cylinder of the engine in the engine operation condition historical data information of which the correlation degree of the engine operation condition is high (namely IAC _ KnkRtd _ a is larger than IAC _ KnkRtd _ HscDat _ Wst), the judgment result is as follows: and the coking problem of pipelines of an engine air inlet system is not found (namely, the second diagnostic standard is to compare the ignition angle delay angle value of each cylinder of the engine with the ignition angle delay angle value of each cylinder of the engine in the historical working condition information indicated by the first correlation degree).

The third non-stringent diagnostic criteria may be defined as: if the algebraic value of the ignition advance angle real-time retarding angle value IAC _ KnkRtd _ a caused by knocking of each cylinder of the engine is smaller than or equal to the algebraic value of the ignition advance angle latest retarding angle value IAC _ KnkRtd _ HscDat _ Wst caused by knocking of each cylinder of the engine in the engine operation condition historical data information of which the correlation degree of the engine operation condition is middle is obtained by searching (namely the algebraic value of the ignition advance angle latest retarding angle value IAC _ KnkRtd _ a is smaller than or equal to IAC _ KnkRtd _ HscDat _ Wst), the judgment result is as follows: the problem of coking of pipelines of an air inlet system of the engine is solved; if the algebraic value of the ignition advance angle real-time retarding angle value IAC _ KnkRtd _ a caused by knocking of each cylinder of the engine is larger than the algebraic value of the ignition advance angle latest retarding angle value IAC _ KnkRtd _ HscDat _ Wst caused by knocking of each cylinder of the engine in the engine operation condition historical data information of which the correlation degree of the engine operation condition is middle is obtained by searching (namely IAC _ KnkRtd _ a is larger than IAC _ KnkRtd _ HscDat _ Wst), the judgment result is as follows: and coking problems of pipelines of an engine air inlet system are not found (namely, the third non-strict diagnostic standard is to compare the ignition advance angle delay value of each cylinder of the engine with the ignition advance angle delay value of each cylinder of the engine in the historical working condition information indicated by the second correlation).

The third stringent diagnostic criteria may be defined as: if the algebraic value of the ignition advance angle real-time retarding angle value IAC _ KnkRtd _ a caused by knocking of each cylinder of the engine is less than or equal to the algebraic value of the second ignition advance angle retarding angle lower limit threshold IAC _ KnkRtd _ C03_ Strc _ V _ L (namely IAC _ KnkRtd _ a is less than or equal to IAC _ KnkRtd _ C03_ Strc _ V _ L), the judgment result is as follows: the problem of coking of pipelines of an air inlet system of the engine is solved; if the algebraic value of the ignition advance angle real-time retarding angle value IAC _ KnkRtd _ a caused by knocking of each cylinder of the engine is larger than the algebraic value of the second ignition advance angle retarding angle lower limit threshold IAC _ KnkRtd _ C03_ Strc _ V _ L (namely IAC _ KnkRtd _ a > IAC _ KnkRtd _ C03_ Strc _ V _ L), the judgment result is as follows: coking exists in the pipelines of the engine air intake system (namely, the third strict diagnostic standard is to compare the ignition angle delay angle value of each cylinder of the engine with a second ignition angle delay angle lower limit threshold value), wherein the value of the second ignition angle delay angle lower limit threshold value IAC _ KnkRtd _ C03_ Strc _ V _ L is equal to the algebraic sum of the following two variables: the first variable is an ignition advance angle latest delay angle value IAC _ KnkRtd _ HscDat _ Wst of each cylinder of the engine caused by knocking in the engine operation condition historical data information of which the correlation degree of the engine operation condition is 'medium', and the second variable is a preset strict addition angle IAC _ KnkRtd _ C03_ StrcAd (or IAC _ KnkRtd _ C03_ StrcAdd _ Sum), namely IAC _ KnkRtd _ C03_ Strc _ V _ L is the Sum of the ignition advance angle latest delay angle value and the preset strict addition angle value of each cylinder of the engine in the historical operation condition information indicated by the second correlation degree (namely, the second ignition advance angle lower limit threshold is the Sum of the ignition advance angle latest delay angle value and the preset strict addition angle value of each cylinder of the engine in the historical operation condition information indicated by the second correlation degree).

In this embodiment, the preset strict addition angle IAC _ knktrd _ C03_ StrcAdd _ Sum may be selected according to different engine models, and is not limited herein. For example, the preset strict addition angle IAC _ knktrd _ C03_ StrcAdd _ Sum can be selected according to the addition rules shown in tables 2 and 3. It should be further noted that the addition rule of the preset strict addition angle IAC _ knktrd _ C03_ StrcAdd _ Sum may not be limited to the two influence factors (engine real-time coolant temperature, engine real-time intake air temperature) listed in tables 2 and 3, but additional other influence factors and preset rules may be added according to the difference of product application scenarios and the difference of product functions; in addition, when a plurality of influence factors are different simultaneously in the comparison process of the real-time engine working condition and the engine running working condition with the medium correlation degree of the engine working condition obtained by searching, the addition value of the IAC _ KnkRtd _ C03_ StrcAdd _ Sum obtained by calculating by superposing the influence factors (namely IAC _ KnkRtd _ C03_ StrcAdd _ Sum is IAC _ KnkRtd _ C03_ StrcAdd _ EngW + IAC _ KnkRtd _ C03_ StrcAdd _ Intk + …).

Table 2 Preset strict addition Angle IAC _ KnkRtd _ C03_ StrcAdd _ EngW Preset rule 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 example of Preset rules (based on Engine real-time intake air 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 that the influence factor of the preset strict addition angle value is the latest delay angle value when the temperature of the engine real-time cooling liquid is measured, and T _ Intk _ a-T _ Intk _ HscDat _ Wst represents that the influence factor of the preset strict addition angle value is the latest delay angle value when the temperature of the engine real-time air inlet is measured.

The fourth diagnostic criteria may be defined as: if the algebraic value of the ignition advance angle real-time retarding angle value IAC _ KnkRtd _ a caused by knocking of each cylinder of the engine is less than or equal to the algebraic value of the third ignition advance angle retarding angle lower limit threshold value IAC _ KnkRtd _ C04_ V _ L (namely IAC _ KnkRtd _ a is less than or equal to IAC _ KnkRtd _ C04_ V _ L), the judgment result is as follows: the problem of coking of pipelines of an air inlet system of the engine is solved; if the algebraic value of the ignition advance angle real-time retarding angle value IAC _ KnkRtd _ a caused by knocking of each cylinder of the engine is larger than the algebraic value of the third ignition advance angle retarding angle lower limit threshold IAC _ KnkRtd _ C04_ V _ L (namely IAC _ KnkRtd _ a > IAC _ KnkRtd _ C04_ V _ L), the judgment result is as follows: and no coking problem exists in the pipeline of the engine air intake system (namely, the fourth diagnosis standard is to compare the ignition advance angle delay angle value of each cylinder of the engine with a third ignition advance angle delay angle lower limit threshold value). For example, the third spark advance angle retard lower limit threshold IAC _ knktrd _ C04_ V _ L may be selected to be-8 ° CA.

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 judgment standard of the engine target working condition information and historical data information, a first diagnosis standard, a second diagnosis standard, a third diagnosis standard, a fourth diagnosis standard, a working condition region which can be judged by 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 and an engine target cooling liquid temperature corresponding to the target working condition information, wherein the judgment standard that 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 target engine 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 target engine 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 judgment standard that the target working condition information of the engine meets the state of the preset standard, a correlation judgment standard of the target working condition information of the engine and historical data information, a first diagnosis standard, a second diagnosis standard, a third diagnosis standard, a fourth diagnosis standard, a working condition region that the diagnosis function of the engine can judge, a lower limit threshold of a first ignition advance angle delay angle, a lower limit threshold of a second ignition advance angle delay angle, a lower limit threshold of a third ignition advance angle delay angle, a target intake air temperature of the engine corresponding to the target working condition information, a target cooling liquid temperature of the engine corresponding to the target working condition information and the like) can be compared according to the determined target diagnosis standard, wherein the judgment standard that the target working condition information of the engine meets the state of the preset standard is that the difference value of the temperature of the cooling liquid in the engine in the target working condition information and the preset target cooling liquid temperature of the engine is obtained The absolute value is smaller than the lower limit threshold of the numerical deviation of the engine coolant temperature in the preset standard state, and the absolute value of the difference value between the engine intake air temperature value in the target working condition information and the preset target engine intake air temperature is smaller than the lower limit threshold of the numerical deviation of the engine intake air temperature in the preset standard state), so that a comparison result is obtained.

And step S104, outputting fault information when the comparison result indicates that the engine of the target vehicle has the coking fault of the air intake system pipeline.

In the embodiment of the invention, when the comparison result indicates that the engine of the target vehicle has the intake system pipeline coking fault (that is, when the comparison result meets the preset diagnosis condition, the engine of the target vehicle is determined to have the intake system pipeline coking problem, the preset diagnosis condition is a preset condition for judging that the variable value of the engine parameter 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), the fault information is output, the user is reminded of having the engine intake system pipeline coking problem caused by the liquid permeating into the engine intake system, and the user is reminded of going to the specified maintenance site to perform fault treatment.

In the embodiment of the invention, the engine air intake system 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 correlation degree judgment standard and other diagnosis preset conditions related in the engine pipeline coking detection process can be updated on line in the vehicle use stage by using an over-the-air technology in a wireless network communication mode. Moreover, the historical data information of the engine working condition in the embodiment can also be shared with the vehicles which are assembled with the engines of the same model and are put into use in a wireless network communication mode (or an internet of vehicles), namely, the historical data information of the engine working condition of other vehicles which are assembled with the engines of the same model and are put into use in a wireless network communication mode (or the internet of vehicles) is searched and received.

In the embodiment of the invention, the pipeline of the air inlet system of the engine does not need to be detached for visual inspection, an additional test instrument does not need to be installed in the pipeline of the air inlet system of the engine, the engine does not need to be controlled to operate under a certain specific operation condition, and the data of the operation condition of the engine when a user vehicle runs daily can be used as a data reference for judging whether the pipeline of the air inlet system of the engine has a coking problem or not only by collecting the data of the operation condition of the engine when the user vehicle runs daily, so that the technical difficulty of detecting the coking of the pipeline 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 detection system for coking in intake system conduits of an internal combustion engine according to an embodiment of the present invention, as shown in FIG. 2, which may include: the device comprises a diagnostic information processing unit 1, an engine electronic control unit 2, a sensor 3, an actuator 4 and an on-board information control display 5, wherein the diagnostic information processing unit 1 comprises: the device comprises an acquisition unit 101, a comparison unit 102, a generation unit 103 and a storage unit 104.

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

The logic signal connection relationship and the operation principle between the diagnostic information processing unit in the system for detecting coking in the pipeline of the internal combustion engine air intake system, other related systems or components of the vehicle and the electronic control unit of the engine according to the embodiment are described in detail with reference to fig. 2 as follows:

the diagnostic information processing unit 1 is used for acquiring 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 to be 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 electronic engine control unit 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.

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, and the diagnostic information processing unit 1 is configured to perform validity evaluation on the real-time operating condition information (i.e. whether the engine operates in the diagnostic operating condition region for a preset duration) by acquiring real-time operating condition information of the engine and the engine electronic control unit 2 when the engine operates in the diagnostic operating condition region during the vehicle driving process (wherein the acquired information in the engine electronic control unit 2 is processing process data or result data of the engine processing the real-time operating condition information), compare the real-time operating condition information with preset information in the diagnostic information processing unit to obtain a comparison result, classify the real-time operating condition information according to a difference in the comparison result and store the data, and, when the comparison result satisfies a preset condition, and generating a control instruction set, sending fault information to the engine electronic control unit 2, reminding a user of the problem of coking of the engine air inlet system pipeline caused by liquid permeating into the engine air inlet system, and reminding the user of going to a specified maintenance site for fault treatment. In this embodiment, the functions of the different sub-units in the diagnostic information processing unit 1 are as follows:

the detection unit 101 is 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 acquisition unit 101 is used for acquiring the real-time working condition information of the engine and the engine electronic control unit 2 when the engine runs in the diagnostic working condition area in the running process of the vehicle.

The comparison unit 102 is 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 acquiring unit 101, the generating unit 103, and the storing unit 104. The comparing unit 102 is used for evaluating the validity of the real-time engine working condition information when the engine runs in the diagnostic working condition area during the running process of the vehicle, and comparing the real-time engine working condition information with the preset information in the diagnostic information processing unit to obtain a comparison result.

The generating unit 103 is a (logical or physical) component of the diagnostic information processing unit 1. There is 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 under the condition that the comparison result meets the preset condition, wherein the control instruction set is used for controlling the diagnostic information processing unit 1 to send fault information to the engine electronic control unit 2, reminding a user of the problem of coking of pipelines of the engine air inlet system caused by liquid permeating into the engine air inlet system, and reminding the user of going to a specified maintenance site for fault processing.

The memory unit 104 is a (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 comparison result and storing the data; meanwhile, during the data processing process performed by the comparing unit 102, the corresponding historical data information may be transmitted to the comparing unit 102 according to the requirement.

And the engine electronic control unit 2 is connected with the diagnostic information processing unit and is used for controlling the operation of the engine and each component thereof, receiving the fault information and adjusting each control parameter value of the engine and each component thereof based on the fault information. The method specifically comprises the following steps: control or data signals are transmitted between the engine electronic control unit 2 and the diagnostic information processing unit 1, the sensor 3, the actuator 4 and the vehicle-mounted information control display 5. The engine electronic control unit 2 is used for collecting data signals from the sensor 3 for describing real-time working condition information of the engine, and simultaneously 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 a data signal describing real-time working condition information of the engine and each component thereof to the vehicle-mounted information control display 5 according to the requirement of a vehicle user through the transmission of a control or data signal between the engine electronic control unit and the vehicle-mounted information control display 5, receives an instruction from the vehicle-mounted information control display 5, and adjusts the operation control parameters of the engine and each component thereof according to the requirement of the vehicle user.

There is 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 electronic engine control unit 2 and transmitting part of the data signals to the vehicle-mounted information control display 5 according to the requirements of vehicle users. The sensor 3 comprises at least one of: the engine comprises an engine knock sensor, an engine speed phase sensor, an engine intake manifold pressure and temperature sensor, an engine supercharging 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.

Control or data signal transmission exists between the actuator 4 and the engine electronic control unit 2 and the vehicle-mounted information control display 5. The actuator 4 is used for receiving control signals from the engine electronic control unit 2 and the vehicle-mounted information control display 5, and executing and completing corresponding programs or actions according to the requirements of a vehicle user. The actuator 4 comprises at least one of: the engine air throttle valve actuator, the engine supercharging bypass valve actuator, the engine ignition coil and the spark plug, the engine air intake system tumble ratio adjusting actuator, the engine water pump, the engine oil pump and the like.

The vehicle-mounted information control display 5 transmits control or data signals with the engine electronic control unit 2, the sensor 3 and the actuator 4. The in-vehicle information control display 5 may be a touch panel display or a Graphical User Interface (GUI). The vehicle-mounted information control display 5 is used for displaying part of necessary real-time working condition information describing the vehicle, the engine and each component of the vehicle to a vehicle user, receiving various instructions expressed by operation (gestures, voice and the like) from the vehicle user, and transmitting 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 diagnosis flow of an alternative diagnosis information processing unit according to an embodiment of the present invention, as shown in fig. 3, including the following steps:

step S301: the method comprises the steps of collecting real-time working condition information of an engine and an engine electronic control unit 2 when the engine runs in a diagnostic working condition area in the running process of a vehicle, wherein the real-time working condition information comprises at least one of the following information: the system comprises real-time knock signal data of each cylinder of the engine, real-time ignition advance angle postponing values caused by knocking of each cylinder of the engine, real-time ignition advance angles of the engine, real-time rotating speed of the engine, real-time relative air inflow of the engine, real-time air inlet temperature of the engine, real-time cooling liquid temperature of the engine, real-time accelerator pedal opening signals of a vehicle driver and the like.

Step S302: and comparing the real-time working condition information of the engine when the engine operates in the diagnosis working condition area in the running process of the vehicle with the preset information and the 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 the data. The preset information in the diagnostic information processing unit 1 includes at least one of the following: the engine control method comprises a lower limit threshold of a difference value of ignition advance angle postponing angle values of a certain cylinder and other cylinders caused by knocking, a target intake air temperature of the engine, a target cooling liquid temperature of the engine, an upper limit threshold of an accelerator pedal opening signal when the vehicle is in a quasi-steady state driving state and the like.

Step S303: and under the condition that the comparison result meets the preset diagnosis condition, generating a control instruction set, 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 pipelines of the engine air inlet system caused by liquid permeating into the engine air inlet system, and reminding the user of going to a specified maintenance site for fault treatment.

Fig. 4 is a schematic diagram of an optional real-time operating condition information acquisition process according to an embodiment of the present invention, as shown in fig. 4, including the following steps: after the flow starts, a decision step SJ0401 is performed: is the engine electronic control unit in the "power on" state? If the determination result is yes, step S0401 is executed: initializing a diagnostic information processing unit; execution judgment step SJ 0402: is it determined whether the engine is in an "on" state? If the determination result is yes, go to step S0402: collecting real-time working condition information of an engine and an engine electronic control unit; executing a judging step SJ 0403: is it determined whether the condition of "the engine is operating in the diagnostic operating condition region" is satisfied? If the determination result is yes, go to step S0403: accumulating the time t _ InDgConZonC continuously satisfying the condition that the engine is operated in the diagnostic operating condition region; execution judgment step SJ 0404: determine t _ InDgConZonc ≧ 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 and executing the judging step SJ0401 and the subsequent flow steps in sequence according to the flow acquisition steps.

After the flow starts, a determination step SJ0401 is performed: is the engine ecu 2 in the "power on" state? If the determination result is yes, step S0401 is executed: initializing the diagnostic information processing unit 1; execution judgment step SJ 0402: is the engine in an "on" state? If the determination result is yes, go to step S0402: collecting real-time working condition information of an engine and an engine electronic control unit 2; executing a judging step SJ 0403: is the condition "engine operating in the diagnostic operating region" satisfied? If the determination result is yes, go to step S0403: accumulating the time t _ InDgConZonC continuously satisfying the condition that the engine is operated in the diagnostic operating condition region; executing a judgment step SJ 0404: t _ InDgConZonc ≧ t _ InDgConZonc _ V _ L? If the judgment result is 'no', returning and executing the judgment step SJ0403 and the subsequent flow steps in sequence according to the steps of the acquisition flow.

After the flow starts, a determination step SJ0401 is performed: is the engine ecu 2 in the "power on" state? If the determination result is yes, step S0401 is executed: initializing the diagnostic information processing unit 1; execution judgment step SJ 0402: is the engine 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 engine electronic control unit 2; executing a judging step SJ 0403: is the condition "engine operating in the diagnostic operating region" satisfied? If the determination result is "no", then step S0405 is executed: resetting the value of t _ InDgConZonC to 0; and returning to and executing the judging step S0402 and subsequent flow steps in sequence according to the steps of the acquisition flow.

After the flow starts, a determination step SJ0401 is performed: is the engine ecu 2 in the "power on" state? If the determination result is yes, step S0401 is executed: initializing the diagnostic information processing unit 1; execution judgment step SJ 0402: is the engine in an "on" state? If the judgment result is 'no', returning and executing the judgment step SJ0401 and the subsequent flow steps in sequence according to the steps of the acquisition flow.

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

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

The initialization diagnostic information processing unit 1 is represented as: starts up and brings the diagnostic information processing unit 1 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 engine electronic 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 in the diagnostic information processing unit 1 is reset and the fault checking function is restarted.

The engine is in the "running" state as follows: under the condition that the engine is in this state, the engine electronic control unit 2 sends an engine ignition signal, and the engine speed can be stabilized and kept above the engine normal operation lower limit threshold value n _ Eng _ V _ L (the value of n _ Eng _ V _ L can be selected according to different engine models, for example, different values of n _ Eng _ V _ L are required to be selected for a hybrid vehicle special engine model, an alternative fuel engine model and a traditional fuel engine model, and n _ Eng _ V _ L can be selected as 300r/min for the traditional fuel engine model).

t _ InDgConZonC is expressed as: the cumulative time that the condition "the engine is operating in the diagnostic operating condition region" is continuously satisfied.

t _ InDgConZonc _ V _ L is expressed as: the lower limit threshold of the condition accumulation time for "the engine is operated in the diagnostic operation region" is continuously satisfied effectively preset in the diagnostic information processing unit 1.

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

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

after the flow starts, step S0501 is performed: reading preset information in the diagnostic information processing unit 1; step S0502: receiving real-time working condition information of the engine and the engine electronic control unit 2, which is acquired by an acquisition unit 101; executing a judgment step SJ 0501: is the engine real-time operating condition information meet "standard status"? If the determination result is yes, the step S0503 is executed: comparing the real-time working condition information with preset information according to a first diagnostic standard; step S0504: obtaining a comparison result and transmitting the comparison result to the generating unit 103; and ending the flow.

After the flow starts, step S0501 is performed: reading preset information in the diagnostic information processing unit 1; step S0502: receiving real-time working condition information of the engine and the engine electronic control unit 2, which is acquired by the acquisition unit 101; executing a judgment step SJ 0501: is the engine real-time operating condition information meet "standard status"? If the determination result is "no", the step S0505 is performed: reading and searching historical data information in the diagnostic information processing unit 1; executing the judging step SJ 0502: whether the correlation degree of the engine working condition can be searched and obtained is as follows: high "historical data information? If the determination result is yes, the step S0506 is executed: comparing the real-time working condition information with preset information according to a second diagnosis standard; step S0504: obtaining a comparison result and transmitting the comparison result to the generating unit 103; and ending the flow.

After the flow starts, step S0501 is performed: reading preset information in the diagnostic information processing unit 1; step S0502: receiving real-time working condition information of the engine and the engine electronic control unit 2, which is acquired by the acquisition unit 101; executing a judgment step SJ 0501: is the engine real-time operating condition information meet "standard status"? If the determination result is "no", the step S0505 is performed: reading and searching historical data information in the diagnostic information processing unit 1; the determination step S0502: whether the correlation degree of the engine working condition can be searched and obtained is as follows: high "historical data information? If the judgment result is 'no', executing a judgment step SJ 0503: whether the correlation degree of the engine working condition can be searched and obtained is as follows: is the "history data information of? If the determination result is yes, the step S0507 is performed: comparing the real-time working condition information with preset information according to a third diagnostic standard; step S0504: obtaining a comparison result and transmitting the comparison result to the generating unit 103; and ending the flow.

After the flow starts, step S0501 is performed: reading preset information in the diagnostic information processing unit 1; step S0502: receiving real-time working condition information of the engine and the engine electronic control unit 2, which is acquired by the acquisition unit 101; executing a judgment step SJ 0501: is the engine real-time operating condition information meet "standard status"? If the determination result is "no", the step S0505 is performed: reading and searching historical data information in the diagnostic information processing unit 1; executing a judgment step SJ 0502: whether the correlation degree of the engine working condition can be searched and obtained is as follows: high "historical data information? If the judgment result is 'no', executing a judgment step SJ 0503: whether the correlation degree of the engine working condition can be searched and obtained is as follows: is the "history data information of? If the determination result is "no", the step S0508: comparing the real-time working condition information with preset information according to a fourth diagnosis standard; step S0509: the real-time working condition information of the engine and the engine electronic control unit 2 collected by the diagnostic information processing unit 1 is transmitted to the storage unit 104; step S0504: obtaining a comparison result and transmitting the comparison result to the generating unit 103; and ending the flow.

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

after the flow starts, step S0601 is executed: reading a diagnosis preset condition in the diagnosis information processing unit 1; step S0602 is executed: receiving the comparison result transmitted by the comparison unit 103; executing a judgment step SJ 0601: is the comparison result satisfied with a preset diagnosis condition? If the determination result is yes, step S0603 is executed: the generation 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 pipelines of an engine air inlet system caused by liquid permeating into the engine air inlet system, and reminds the user of going to a specified maintenance site to perform fault treatment; and ending the flow.

After the flow starts, step S0601 is executed: reading a diagnosis preset condition in the diagnosis information processing unit 1; step S0602 is executed: receiving the comparison result transmitted by the comparison unit 103; executing a judgment step SJ 0601: is the comparison result satisfied with a preset diagnosis condition? If the determination result is "no", the step S0604 is executed: the generation unit 103 generates a control instruction set, and sends a command indicating "diagnosis result: data information of no fault found "; and ending the flow.

In the present embodiment, the diagnosis preset condition is expressed as: after the data information which describes the real-time working condition of the engine and is acquired by the diagnostic information processing unit 1 is compared with the preset information and the historical data information in the diagnostic information processing unit 1, whether the compared judgment result indicates that the pipeline of the engine air intake system has the coking problem or not is obtained.

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

According to another aspect of the embodiment of the invention, an on-board readable storage medium is also provided, and the on-board readable storage medium comprises a stored computer program, wherein when the computer program runs, the device on which the on-board readable storage medium is controlled to execute the above-mentioned method for detecting coking of the air intake system pipeline of the internal combustion engine.

The above-mentioned serial numbers of the embodiments of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.

In the above embodiments of the present invention, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described in detail in a certain embodiment.

In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be an indirect coupling or communication connection through some interfaces, units or modules, and may be electrical or in 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute 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), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

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

acquiring 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 to be 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 the coking fault of the air inlet system pipeline.

2. The detection method according to claim 1, wherein the step of collecting target operating condition information of an engine of the target vehicle during running comprises:

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 which can be judged by 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 greater than a preset time length threshold from all the working condition information, wherein the target working condition information comprises at least one of the following conditions: the engine comprises knock signal data of each cylinder of the engine, ignition advance angle postponing values of each cylinder of the engine, an engine ignition advance angle, engine speed, engine air inlet quantity, engine air inlet temperature, engine coolant temperature and a vehicle accelerator pedal opening signal.

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

determining the correlation degree between the historical working condition information and the target working condition information in the historical data information;

determining the target diagnostic criterion as a second diagnostic criterion if the degree of correlation is a first degree of correlation;

determining the target diagnostic criterion as a third diagnostic criterion in the case that the correlation is a second correlation, wherein the third diagnostic criterion is divided into a third strict diagnostic criterion and a third non-strict diagnostic criterion;

determining the target diagnosis criterion as a fourth diagnosis criterion in a case where the correlation is a third correlation.

4. The detection method according to claim 3, wherein the step of determining the correlation between the historical operating condition information and the target operating condition information in the historical data information comprises:

obtaining an engine speed value, an engine intake temperature value and an engine coolant temperature value in the historical operating condition information, and obtaining variables and values describing engine load in the historical operating condition information, wherein the variables and values describing the engine load comprise at least one of the following variables: the engine air inflow, the engine intake air flow, the engine intake manifold pressure and the engine supercharging pressure;

and determining the degree of correlation by adopting a preset degree of correlation strategy based on the engine speed numerical value, the engine intake temperature numerical value, the engine coolant temperature numerical value, the variable and numerical value describing the engine load and the target working condition information.

5. The detection method according to claim 3, wherein, in a 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-stringent diagnostic criterion in the event that the engine intake air temperature value in the target operating condition information is higher than the engine intake air temperature value in the historical operating condition information indicated by the second degree of correlation, or in the event that the engine coolant temperature value in the target operating condition information is higher than the engine coolant temperature value in the historical operating condition information indicated by the second degree of correlation;

the third severity diagnostic criteria is executed where the engine intake air temperature value in the target operating condition information is lower than the engine intake air temperature value in the historical operating condition information indicated by the second degree of correlation, and where the engine coolant temperature value in the target operating condition information is lower than the engine coolant temperature value in the historical operating condition information indicated by the second degree of correlation.

6. The detection method according to claim 5, characterized in that the first diagnostic criterion is a comparison of a value of an angle of ignition advance retard angle for each cylinder of the engine with a first lower threshold value of the angle of ignition advance retard angle; the second diagnosis standard is to compare the ignition advance angle delay angle value of each cylinder of the engine with the ignition advance angle delay angle value of each cylinder of the engine in the historical working condition information indicated by the first correlation degree; the third non-strict diagnostic standard is to compare the ignition advance angle delay value of each cylinder of the engine with the ignition advance angle delay value of each cylinder of the engine in the historical working condition information indicated by the second correlation degree; the third strict diagnosis standard is that the ignition advance angle postponing angle value of each cylinder of the engine is compared with a second ignition advance angle postponing angle lower limit threshold; the fourth diagnostic criterion is to compare the ignition advance angle postponed value of each cylinder of the engine with a third ignition advance angle postponed lower threshold, where the second ignition advance angle postponed lower threshold is the sum of the latest ignition advance angle postponed value of each cylinder of the engine in the historical working condition information indicated by the second correlation and a preset strict addition angle value, and an influence factor of the preset strict addition angle value includes at least one of: engine coolant temperature, engine intake air temperature.

7. The detection method according to claim 1, wherein 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 judgment standard of the engine target working condition information and historical data information, a first diagnosis standard, a second diagnosis standard, a third diagnosis standard, a fourth diagnosis standard, a working condition region which can be judged by 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 and an engine target cooling liquid temperature corresponding to the target working condition information, wherein the judgment standard that the engine target working condition information meets the preset standard state is as follows: the absolute value of the difference value 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 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 the lower limit threshold of the deviation of the engine air inlet temperature value in the preset standard state.

8. A detection system for internal combustion engine air intake system pipe coking, characterized by comprising:

the diagnostic information processing unit is used for acquiring 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 to be 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; sending fault information to an electronic engine control unit under the condition that the comparison result indicates that the engine of the target vehicle has an intake system pipeline coking fault;

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

9. A vehicle comprising an onboard electronic control unit, wherein the onboard electronic control unit is configured to execute the method for detecting coking in air intake system pipes of an internal combustion engine according to any one of claims 1 to 7.

10. An on-board readable storage medium, comprising a stored computer program, wherein the computer program when executed controls an apparatus in which the on-board readable storage medium is located to perform the method for detecting coking in an intake system conduit of an internal combustion engine according to any one of claims 1 to 7.