CN112096532B - Method and system for limiting fuel injection quantity - Google Patents

Method and system for limiting fuel injection quantity Download PDF

Info

Publication number
CN112096532B
CN112096532B CN201910526489.9A CN201910526489A CN112096532B CN 112096532 B CN112096532 B CN 112096532B CN 201910526489 A CN201910526489 A CN 201910526489A CN 112096532 B CN112096532 B CN 112096532B
Authority
CN
China
Prior art keywords
current
engine
fuel injection
parameter set
parameter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910526489.9A
Other languages
Chinese (zh)
Other versions
CN112096532A (en
Inventor
李达
胡佳富
张海辰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Foton Cummins Engine Co Ltd
Original Assignee
Beijing Foton Cummins Engine Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Foton Cummins Engine Co Ltd filed Critical Beijing Foton Cummins Engine Co Ltd
Priority to CN201910526489.9A priority Critical patent/CN112096532B/en
Publication of CN112096532A publication Critical patent/CN112096532A/en
Application granted granted Critical
Publication of CN112096532B publication Critical patent/CN112096532B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1466—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a soot concentration or content
    • F02D41/1467—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a soot concentration or content with determination means using an estimation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Abstract

The invention provides a method and a system for limiting fuel injection quantity, belonging to the technical field of electric control diesel engines. The method comprises the following steps: determining a parameter set influencing the smoke intensity at the outlet of the engine and determining the influence level of each parameter in the parameter set; determining an influence factor corresponding to each parameter according to the magnitude relation of all influence levels and the change of the smoke intensity at the outlet of the engine caused by the change of each parameter, forming an influence factor set, and constructing an estimation model according to the influence factor set. The control module for the engine considers relevant parameters of the smoke emission of the engine from multiple dimensions, and can solve the technical problems of failure of smoke emission limit of the engine or low accuracy of operation intervention limit and the like.

Description

Method and system for limiting fuel injection quantity
Technical Field
The invention relates to the technical field of electronic control diesel engines, in particular to a method for constructing an engine outlet smoke degree estimation model, a method for limiting fuel injection quantity by using the engine outlet smoke degree estimation model, an engine outlet smoke degree prediction method, a system for limiting fuel injection quantity, equipment for limiting fuel injection quantity and a computer readable storage medium.
Background
According to the scheme of limiting the oil injection quantity of the engine according to the smoke intensity of the engine at present, when the air-fuel ratio of the engine is smaller than a certain value under a certain rotating speed and the oil injection quantity, the oil injection quantity is limited; the existing scheme mainly considers the influence of an air-fuel ratio on the smoke intensity, but the smoke intensity of an engine in practice is also influenced by factors such as an Exhaust Gas Recirculation (EGR) rate, rail pressure, a main jet advance angle and the like; if only considering the air-fuel ratio, the engine has the phenomenon of high air-fuel ratio and low smoke emission during the operation process, but because the fuel injection limiting mechanism of the existing engine scheme directly judges the threshold value of the air-fuel ratio, when the air-fuel ratio is increased and reaches the threshold value of the fuel injection limiting mechanism, the operation of limiting the fuel injection is executed, and the operation not only belongs to the wrong execution operation, but also influences the engine power; or the phenomenon that the air-fuel ratio is small but the smoke emission is large exists, the oil injection amount is not limited because the air-fuel ratio does not reach the threshold value, but the smoke emission amount of the engine is in an interval which needs to be limited by adjusting the oil injection amount, and the smoke emission limit of the engine is invalid.
Disclosure of Invention
The invention aims to provide a method and a system for limiting fuel injection quantity, and the prior art has the technical problems of failure of smoke emission limit of an engine or low accuracy of limited operation intervention and the like.
In order to achieve the above object, an embodiment of the present invention provides a method for constructing an engine outlet smoke degree estimation model, including:
s1) determining a parameter set influencing the smoke intensity at the outlet of an engine and determining the influence level of each parameter in the parameter set;
and S2) determining an influence factor corresponding to each parameter according to the magnitude relation of all the influence levels and the change of the smoke intensity at the outlet of the engine caused by the change of each parameter, forming an influence factor set, and constructing an estimation model according to the influence factor set.
Specifically, the parameter set in step S1) includes:
engine torque and engine speed;
further comprising: at least one of an exhaust gas recirculation rate, a rail pressure, a fuel injection amount, an injection parameter, an air-fuel ratio, and an injection angle.
Specifically, the determining the influence level of each parameter in the parameter set in step S1) includes:
and acquiring the engine outlet smoke degree corresponding to every two parameters, determining relative influence levels, and determining the influence level of each parameter according to all the relative influence levels.
Specifically, the step S2) of constructing an estimation model according to the set of influence factors includes:
and taking the product relation of all the influence factors in the influence factor set as an estimation model, and taking the product value of the quantities of all the influence factors in the influence factor set as the engine outlet smoke degree of the estimation model.
Specifically, still include:
s3) obtaining the estimated engine outlet smoke degree of the estimation model corresponding to the product value of all the current quantities of the influence factors in the influence factor set, obtaining the current parameter of the parameter corresponding to each current quantity of the influence factors in the influence factor set, forming a current parameter set, and measuring the actual engine outlet smoke degree under the working condition of the current parameter set;
and S4) selectively adjusting the current amount of the influence factor according to the estimated engine outlet smoke degree and the actual engine outlet smoke degree by combining the threshold condition.
The embodiment of the invention provides a method for limiting fuel injection quantity by using an engine outlet smoke degree estimation model, which comprises the following steps:
s1) acquiring a current parameter set of a parameter set influencing the smoke intensity at the outlet of an engine, and determining the current quantity of an influencing factor corresponding to the parameters in the parameter set according to the current parameter set;
and S2) obtaining the estimated engine outlet smoke intensity by combining the current quantity of all the influence factors with a preset estimation model, and limiting the fuel injection quantity according to the estimated engine outlet smoke intensity.
Specifically, the step S2) of limiting the fuel injection amount according to the estimated engine outlet smoke intensity includes:
s201) determining the current maximum oil quantity increasing rate according to the estimated engine outlet smoke degree;
s202) obtaining the current fuel injection quantity, and determining the maximum fuel injection quantity according to the current fuel quantity maximum increasing rate and the current fuel injection quantity.
The embodiment of the invention provides a method for predicting smoke intensity at an outlet of an engine, which comprises the following steps:
s1) obtaining sample data, wherein the sample data comprises an actual engine outlet smoke intensity and a parameter set influencing the engine outlet smoke intensity, and each parameter in the parameter set has an actual parameter;
s2) selecting a machine learning model and setting a loss amount, training by combining the sample data with the machine learning model and the loss amount, and obtaining a prediction model for the smoke intensity at the outlet of the engine after training;
and S3) acquiring a current parameter set of the parameter set, and then combining the current parameter set with a prediction model to obtain the predicted engine outlet smoke intensity.
An embodiment of the present invention provides a system for limiting a fuel injection amount, including:
the estimation module is used for receiving a current parameter set of a parameter set influencing the engine outlet smoke intensity and obtaining the estimated engine outlet smoke intensity by combining a preset estimation model according to the current parameter set;
and the limiting module is used for receiving the current fuel injection amount and the estimated engine outlet smoke degree, obtaining the maximum fuel injection amount according to the current fuel injection amount and the estimated engine outlet smoke degree, and updating the maximum fuel injection amount to the current maximum fuel injection amount.
Optionally, the estimating module is configured with a first data table or a first fitted curve, where the first data table or the first fitted curve at least has a numerical correspondence between each parameter of any one parameter in the parameter set and the current quantity of the influence factor;
the estimation module is used for determining all the current quantities of the influence factors by utilizing the first data table or the first fitted curve according to the current parameter set and obtaining the estimated engine outlet smoke degree by combining all the current quantities of the influence factors with a preset estimation model.
Optionally, the limiting module is configured with a second data table or a second fitted curve, wherein the second data table or the second fitted curve has a numerical correspondence of each engine outlet smoke intensity to a maximum rate of increase of the oil mass;
and the limiting module is used for determining the current maximum oil quantity increasing rate by utilizing the second data table or the second fitted curve according to the estimated engine outlet smoke intensity and obtaining the maximum fuel injection quantity by combining the current maximum oil quantity increasing rate and the current fuel injection quantity with a preset mapping relation.
In still another aspect, an embodiment of the present invention provides an apparatus for limiting a fuel injection amount, including:
at least one processor;
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the at least one processor implements the aforementioned method by executing the instructions stored by the memory.
In yet another aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer instructions, which, when executed on a computer, cause the computer to perform the foregoing method.
Corresponding to the content, the method comprises the steps of establishing an estimated smoke intensity model by introducing a parameter set with a plurality of parameters and determining an influence factor (importance) of each parameter;
the invention additionally increases the rotating speed torque of the engine, the exhaust gas recirculation rate, the rail pressure, the injection parameter, the rotating speed of the engine and the injection angle, and has the multidimensional characteristic and the accuracy of limiting the operation intervention;
the invention provides a way to determine the impact factor;
the method can obtain the estimated smoke intensity by combining the quantity of all the influence factors with the product relationship;
the method can adjust the current quantity of the influence factors which are not suitable for estimating the smoke intensity by estimating the smoke intensity difference between the smoke intensity and the actual smoke intensity corresponding to the actual parameter set and combining with the threshold condition;
the maximum fuel injection quantity can be obtained through the relation between the maximum oil quantity increasing rate and the smoke intensity, so that the purpose of limiting the fuel injection quantity is achieved;
the invention provides a mode for predicting smoke intensity by using machine learning;
the invention can directly inquire the corresponding relation through a data table or a fitting curve form to obtain the smoke value and the maximum oil quantity increasing rate, and has high practicability and low cost on the basis of overcoming the problem of smoke emission limit failure of an engine compared with the scheme of complex rule calculation and multi-strategy threshold judgment.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a schematic diagram of a main system architecture according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a corresponding relationship between torque and influence factor based on rotational speed according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating the relationship between the air-fuel ratio and the influence factor thereof according to the embodiment of the present invention;
FIG. 4 is a diagram illustrating the relationship between the EGR rate and the influence factor thereof according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating the relationship between the fuel injection amount and the influence factor thereof according to the embodiment of the present invention;
FIG. 6 is a diagram illustrating a relationship between rail pressure and an influence factor thereof according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating a relationship between a rotation speed and an influence factor thereof according to an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating the relationship between the injection angle and the influence factor thereof according to the embodiment of the present invention;
FIG. 9 is a diagram illustrating a relationship between smoke and a maximum increase rate of oil in an embodiment of the present invention;
FIG. 10 is a graph showing a curve fitted between the smoke and the maximum rate of increase in oil according to an embodiment of the present invention;
FIG. 11 is a diagram illustrating the deviation between the estimated smoke level and the reference smoke level according to the embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Example 1
The embodiment provides a method for constructing an engine outlet smoke degree estimation model, which comprises the following steps:
s1) determining a parameter set influencing the smoke intensity at the outlet of an engine and determining the influence level of each parameter in the parameter set;
s2) determining influence factors corresponding to all parameters according to the magnitude relation of all the influence levels and the change of the smoke intensity at the outlet of the engine caused by the change of each parameter, forming an influence factor set, and constructing an estimation model according to the influence factor set;
specifically, the parameter set in step S1) includes:
engine torque and engine speed;
further comprising: at least one of an exhaust gas recirculation rate, a rail pressure, a fuel injection quantity (present), an injection parameter, an air-fuel ratio, and an injection angle;
the injection parameters can also comprise each injection point position angle and each injection point position oil quantity (main injection oil quantity and advance angle, pilot injection oil quantity and advance angle, post injection oil quantity and injection angle) according to specific engine conditions, and the parameter set can also increase parameters such as waste gas flow and the like.
Specifically, the determining the influence level of each parameter in the parameter set in step S1) includes:
acquiring the engine outlet smoke degree corresponding to every two parameters, determining relative influence levels, and determining the influence level of each parameter according to all the relative influence levels;
the steady-state and transient data of the engine on the rack can be collected, and the influence factor corresponding to each parameter and the current quantity of the influence factor corresponding to each parameter in a plurality of parameters of each parameter are determined by utilizing the influence level or the relative influence level, as shown in figures 2-8;
specifically, the step S2) of constructing an estimation model according to the set of influence factors includes:
taking the product relation of all the influence factors in the influence factor set as an estimation model, and taking the product value of the quantity continuous multiplication of all the influence factors in the influence factor set and the product value calculated by the basic smoke intensity as the engine outlet smoke intensity S of the estimation model o Namely:
Figure GDA0003908216030000071
wherein S is base Is a base smoke level determined by engine torque and engine speed and has a dimension of mg/m 3 ，F i Is the ith influencing factor, the ith influencing factor F i The method can be characterized in that an AFR influence factor (corresponding to an air-Fuel ratio), an EGR influence factor (corresponding to an EGR rate), a Fuel influence factor (corresponding to a Fuel injection quantity), an RP influence factor (corresponding to a rail pressure), a Speed influence factor (corresponding to a rotating Speed) and an SOI influence factor (corresponding to an injection angle), i is marked as A by { AFR, EGR, fuel, RP, speed, SOI }, { AFR, EGR, fuel, RP, speed, SOI };
the influence level can be measured through transient and steady state data of parameter change of parameters and smoke intensity measured value change, the relative influence level of the injection angle relative to the rail pressure is small (can be obtained through a contrast experiment), the fluctuation range of the influence factor of the injection angle is 1-3 and the rail pressure is 1-60 through carrying out a plurality of times of bench collection experiments and/or simulation experiments, and the influence level of the injection angle is smaller than the influence level of the rail pressure.
Specifically, still include:
s3) obtaining the estimated engine outlet smoke degree of the estimation model corresponding to the product value of all the current quantities of the influence factors in the influence factor set (for example, when the air-fuel ratio is 15, the current quantity of the AFR influence factor is 17), obtaining the current parameter of the parameter corresponding to each current quantity of the influence factors in the influence factor set, forming a current parameter set, and measuring the actual engine outlet smoke degree under the working condition of the current parameter set;
s4) selectively adjusting the current quantity of the influence factors according to the estimated engine outlet smoke degree and the actual engine outlet smoke degree and in combination with the threshold condition;
threshold conditions are set according to actual engine conditions, the threshold conditions can evaluate the difference between smoke emission and actual smoke emission, and the current quantity of the influence factors can be selectively adjusted so as to enable the difference to meet the threshold conditions.
Example 2
Based on embodiment 1, the present embodiment provides a method of limiting a fuel injection amount using an engine outlet smoke degree estimation model, the method including:
s1) acquiring a current parameter set of a parameter set influencing the smoke intensity at the outlet of an engine, and determining the current quantity of an influencing factor corresponding to the parameters in the parameter set according to the current parameter set;
s2) obtaining an estimated engine outlet smoke intensity by combining the current quantity of all the influence factors with a preset estimation model, and limiting the fuel injection quantity according to the estimated engine outlet smoke intensity;
specifically, the step S2) of limiting the fuel injection amount according to the estimated engine outlet smoke intensity includes:
s201) determining the current maximum oil quantity increasing rate according to the estimated engine outlet smoke degree;
s202) obtaining the current fuel injection quantity, and determining the maximum fuel injection quantity according to the maximum increasing rate of the current fuel quantity and the current fuel injection quantity;
for example, the current engine speed is 1000rpm, the torque is 150 N.m, the air-fuel ratio is 25, the EGR rate is 0.4, the fuel injection amount is 10mg/stroke, the rail pressure is 800bar, no pre-injection and post-injection are carried out, and the main injection advance angle is 2.5deg; then, with reference to fig. 2-8, the smoke intensity at the outlet of the engine can be obtained as follows:
S o ＝S base ×F AFR ×F EGR ×F Fuel ×F RP ×F Speed ×F SOI
＝1.7×3×2×1.2×2×0.755×1.05(mg/m 3 )
≈19.4mg/m 3
the maximum increase rate R of the current oil amount can be obtained by fitting the curve 10 determined in FIG. 9 0 =0.384, units 1/s, s is seconds;
the preset map is configured such that the maximum fuel injection amount F is made at a system step size of 0.1 second(s) max Satisfies the following conditions:
F max ＝F 0 ×(1+R 0 ×0.1)
wherein, F 0 Is the current fuel injection amount, then
F max ＝10×(1+0.384×0.1)＝10.384mg/stroke
FIG. 11 is a diagram illustrating the deviation between the estimated smoke level and the Reference smoke level, wherein the abscissa Reference PM Out Rate is the Reference smoke level and the ordinate is the Simulated PM Out Rate is the estimated smoke level.
Example 3
For smoke intensity prediction, an embodiment of the present invention provides an engine outlet smoke intensity prediction method, including:
s1) obtaining sample data, wherein the sample data comprises an actual engine outlet smoke intensity and a parameter set influencing the engine outlet smoke intensity, and each parameter in the parameter set has an actual parameter; the sample data can also be divided into a test set and a training set, the test set has an actual engine outlet smoke intensity with a corresponding relation and a parameter set influencing the engine outlet smoke intensity, and the training set can have the corresponding relation or a random corresponding relation;
s2) selecting a machine learning model and setting a loss amount, training by combining the sample data with the machine learning model and the loss amount, and obtaining a prediction model for the smoke intensity at the outlet of the engine after training; the loss amount is used for describing the difference between the predicted smoke degree of the test set and the predicted smoke degree of the training set in the training process;
and S3) acquiring a current parameter set of the parameter set, and then combining the current parameter set with a prediction model to obtain the predicted engine outlet smoke intensity.
Example 4
An embodiment of the present invention provides a system for limiting a fuel injection amount, including:
the estimation module is used for receiving a current parameter set of a parameter set influencing the engine outlet smoke intensity and obtaining the estimated engine outlet smoke intensity by combining a preset estimation model according to the current parameter set;
the limiting module is used for receiving the current fuel injection amount and the estimated engine outlet smoke degree, obtaining the maximum fuel injection amount according to the current fuel injection amount and the estimated engine outlet smoke degree, and updating the maximum fuel injection amount to the current maximum fuel injection amount;
the system can be arranged on an engine control module; the system can also be provided with a configuration module used for debugging the estimation module relative to the current engine, modifying the current quantity of the influence factors or increasing or decreasing the parameter set during operation and maintenance;
optionally, the estimating module is configured with a first data table or a first fitted curve, where the first data table or the first fitted curve at least has a numerical correspondence between each parameter of any one parameter in the parameter set and the current quantity of the influence factor;
the estimation module is used for determining all the current quantities of the influence factors by utilizing the first data table or the first fitted curve according to the current parameter set and obtaining the estimated engine outlet smoke degree by combining all the current quantities of the influence factors with a preset estimation model.
Optionally, the limiting module is configured with a second data table or a second fitted curve, wherein the second data table or the second fitted curve has a numerical correspondence of each engine outlet smoke intensity to a maximum rate of increase of oil mass;
and the limiting module is used for determining the current maximum oil quantity increasing rate by utilizing the second data table or the second fitted curve according to the estimated engine outlet smoke intensity and obtaining the maximum fuel injection quantity by combining the current maximum oil quantity increasing rate and the current fuel injection quantity with a preset mapping relation.
The system of the invention is used for a control module of a diesel engine, and engine smoke emission related parameters are considered from multiple dimensions, such as: the smoke intensity of the outlet of the engine is comprehensively simulated and calculated by using the parameters of the engine speed, the engine torque, the engine injection oil quantity, the air-fuel ratio, the EGR rate, the main injection oil quantity and the advance angle, the pilot injection oil quantity and the advance angle, the post injection oil quantity and the injection angle, the rail pressure, the exhaust gas flow and the like, and the smoke intensity of the outlet of the engine is limited when the smoke intensity calculated by simulation is larger than a certain limit value, so that the smoke intensity emission is limited.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.

Claims (11)

1. A method of constructing an engine outlet smoke estimation model, the method comprising:
s1) determining a parameter set influencing the smoke intensity at the outlet of an engine and determining the influence level of each parameter in the parameter set;
s2) determining influence factors corresponding to all parameters according to the magnitude relation of all influence levels and the change of the engine outlet smoke degree caused by the change of each parameter, forming an influence factor set, constructing an estimation model according to the influence factors in a combination mode, and estimating the engine outlet smoke degree S in the estimation model o Namely:
Figure FDA0004057289160000011
in the formula, S base Is a base smoke determined by engine torque and engine speed and has a dimension of mg/m 3 ，F i Is the ith influencing factor, the ith influencing factor F i The Fuel injection amount is any one of an AFR influence factor corresponding to an air-Fuel ratio, an EGR influence factor corresponding to an EGR rate, a Fuel influence factor corresponding to a Fuel injection amount, an RP influence factor corresponding to a rail pressure, a Speed influence factor corresponding to a rotating Speed and an SOI influence factor corresponding to an injection angle, wherein A is AFR, EGR, fuel, RP, speed and SOI;
wherein the estimated engine outlet smoke intensity is used for determining a current maximum fuel increase rate, and the current maximum fuel increase rate is used for determining a maximum fuel injection amount together with the obtained current fuel injection amount;
determining the influence level of each parameter in the parameter set in step S1), including:
and acquiring the engine outlet smoke degree corresponding to each two parameters, determining relative influence levels, and determining the influence level of each parameter according to all the relative influence levels.
2. The method of constructing an engine outlet smoke estimation model according to claim 1, wherein the parameter set in step S1) comprises:
engine torque and engine speed;
further comprising: at least one of an exhaust gas recirculation rate, a rail pressure, an injection parameter, a fuel injection amount, an air-fuel ratio, and an injection angle.
3. The method of constructing an engine exit smoke estimation model according to claim 1, further comprising:
s3) obtaining the estimated engine outlet smoke degree of the estimation model corresponding to the product value of all the current quantities of the influence factors in the influence factor set, obtaining the current parameter of the parameter corresponding to each current quantity of the influence factors in the influence factor set, forming a current parameter set, and measuring the actual engine outlet smoke degree under the working condition of the current parameter set;
and S4) selectively adjusting the current quantity of the influence factor according to the estimated engine outlet smoke degree and the actual engine outlet smoke degree in combination with a threshold condition.
4. A method of limiting a fuel injection amount using an engine-out smoke degree estimation model, wherein the estimation model used is the estimation model in the method of constructing the engine-out smoke degree estimation model according to any one of claims 1 to 3, characterized by comprising:
s1) acquiring a current parameter set of a parameter set influencing the smoke intensity at the outlet of an engine, and determining the current quantity of an influencing factor corresponding to the parameters in the parameter set according to the current parameter set;
and S2) obtaining the estimated engine outlet smoke intensity by combining the current quantity of all the influence factors with the estimation model, and limiting the fuel injection quantity according to the estimated engine outlet smoke intensity.
5. The method of limiting a fuel injection quantity using an engine-out smoke degree estimation model according to claim 4, wherein limiting a fuel injection quantity based on the estimated engine-out smoke degree in step S2) comprises:
s201) determining the current maximum oil quantity increasing rate according to the estimated engine outlet smoke degree;
s202) obtaining the current fuel injection quantity, and determining the maximum fuel injection quantity according to the current fuel quantity maximum increasing rate and the current fuel injection quantity.
6. A method of predicting engine-out smoke density, wherein a set of parameters used in the method of constructing an engine-out smoke density estimation model according to any one of claims 1 to 3 is the set of parameters, the method comprising:
s1) obtaining sample data, wherein the sample data comprises an actual engine outlet smoke intensity and a parameter set influencing the engine outlet smoke intensity, and each parameter in the parameter set has an actual parameter;
s2) selecting a machine learning model and setting a loss amount, training by combining the sample data with the machine learning model and the loss amount, and obtaining a prediction model for the smoke intensity at the outlet of the engine after training;
and S3) acquiring a current parameter set of the parameter set, and then combining the current parameter set with a prediction model to obtain the predicted engine outlet smoke intensity.
7. A system for limiting a fuel injection amount, wherein an estimation model used by the system is an estimation model in the method of constructing an engine outlet smoke degree estimation model according to any one of claims 1 to 3, characterized by comprising:
the estimation module is used for receiving a current parameter set of a parameter set influencing the engine outlet smoke intensity and combining the current parameter set with the estimation model to obtain the estimated engine outlet smoke intensity;
and the limiting module is used for receiving the current fuel injection amount and the estimated engine outlet smoke degree, obtaining the maximum fuel injection amount according to the current fuel injection amount and the estimated engine outlet smoke degree, and updating the maximum fuel injection amount to the current maximum fuel injection amount.
8. The system for limiting fuel injection quantity according to claim 7,
the estimation module is configured with a first data table or a first fitting curve, wherein the first data table or the first fitting curve at least has a numerical correspondence of each parameter of any one parameter in the parameter set and the current quantity of the influence factor;
the estimation module is used for determining all the current quantities of the influence factors by utilizing the first data table or the first fitted curve according to the current parameter set and obtaining the estimated engine outlet smoke degree by combining all the current quantities of the influence factors with a preset estimation model.
9. The system of limiting a fuel injection quantity according to claim 7 or 8,
the limiting module is configured with a second data table or a second fitted curve, wherein the second data table or the second fitted curve has a numerical correspondence of each engine outlet smoke intensity to a maximum rate of increase of oil mass;
and the limiting module is used for determining the current maximum oil quantity increasing rate by utilizing the second data table or the second fitted curve according to the estimated engine outlet smoke intensity and obtaining the maximum fuel injection quantity by combining the current maximum oil quantity increasing rate and the current fuel injection quantity with a preset mapping relation.
10. An apparatus for limiting a fuel injection quantity, characterized by comprising:
at least one processor;
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the at least one processor implementing the method of any one of claims 1 to 6 by executing the instructions stored by the memory.
11. A computer readable storage medium storing computer instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1 to 6.
CN201910526489.9A 2019-06-18 2019-06-18 Method and system for limiting fuel injection quantity Active CN112096532B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910526489.9A CN112096532B (en) 2019-06-18 2019-06-18 Method and system for limiting fuel injection quantity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910526489.9A CN112096532B (en) 2019-06-18 2019-06-18 Method and system for limiting fuel injection quantity

Publications (2)

Publication Number Publication Date
CN112096532A CN112096532A (en) 2020-12-18
CN112096532B true CN112096532B (en) 2023-03-14

Family

ID=73748716

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910526489.9A Active CN112096532B (en) 2019-06-18 2019-06-18 Method and system for limiting fuel injection quantity

Country Status (1)

Country Link
CN (1) CN112096532B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113326992B (en) * 2021-06-30 2022-03-29 广西大学 Optimization method for smoke limit value of electric control diesel engine under working condition of rapidly increasing accelerator
CN114810390A (en) * 2022-04-12 2022-07-29 潍柴动力股份有限公司 Diesel engine, fuel injection quantity control method and device thereof and vehicle

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2090767A1 (en) * 2008-02-13 2009-08-19 GM Global Technology Operations, Inc. Estimation of the soot load of a particulate filter
WO2011018918A1 (en) * 2009-08-10 2011-02-17 三菱重工業株式会社 Pm emission amount estimation device for diesel engine
CN102159804A (en) * 2008-05-16 2011-08-17 丰田自动车株式会社 Soot discharge estimating device for internal combustion engines
CN103032142A (en) * 2011-09-30 2013-04-10 沃尔沃汽车公司 Soot emission estimation method and arrangement
CN103790721A (en) * 2014-02-24 2014-05-14 吉林大学 EGR control system and method for instantaneous conditions of internal combustion engine
JP2015124622A (en) * 2013-12-25 2015-07-06 株式会社デンソー Soot emission amount estimation device
CN109162817A (en) * 2018-10-31 2019-01-08 潍柴动力股份有限公司 A kind of controlling method for diesel engine and device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2090767A1 (en) * 2008-02-13 2009-08-19 GM Global Technology Operations, Inc. Estimation of the soot load of a particulate filter
CN102159804A (en) * 2008-05-16 2011-08-17 丰田自动车株式会社 Soot discharge estimating device for internal combustion engines
WO2011018918A1 (en) * 2009-08-10 2011-02-17 三菱重工業株式会社 Pm emission amount estimation device for diesel engine
CN103032142A (en) * 2011-09-30 2013-04-10 沃尔沃汽车公司 Soot emission estimation method and arrangement
JP2015124622A (en) * 2013-12-25 2015-07-06 株式会社デンソー Soot emission amount estimation device
CN103790721A (en) * 2014-02-24 2014-05-14 吉林大学 EGR control system and method for instantaneous conditions of internal combustion engine
CN109162817A (en) * 2018-10-31 2019-01-08 潍柴动力股份有限公司 A kind of controlling method for diesel engine and device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
增压中冷柴油机排放预测和控制;关荣;《中国优秀硕士学位论文全文数据库（电子期刊）工程科技Ⅱ辑》;20050315;第18页 *

Also Published As

Publication number Publication date
CN112096532A (en) 2020-12-18

Similar Documents

Publication Publication Date Title
CN112096532B (en) Method and system for limiting fuel injection quantity
US20130085733A1 (en) NOx EMISSION ESTIMATION METHOD AND ARRANGEMENT
EP2574762B1 (en) Soot emission estimation method and arrangement
DE102020121687A1 (en) FUEL INJECTION CONTROL USING A NEURONAL NETWORK
CN109992916A (en) A kind of engineering outfield aircraft engine failure prediction method based on flight data, terminal and readable storage medium storing program for executing
US20150262434A1 (en) Performance of experiments
CN105300699B (en) A kind of assessment method of motor power transient performance
CN103089460A (en) Engine exhaust gas recirculation (EGR) valve closed-loop control system
CN112228234A (en) Transient fuel control method and system of gas engine for power generation
CN102374094A (en) Engine fire fault diagnosis method
KR20060073959A (en) Method and system for adaptation of transient engine performance
CN103994005A (en) Fuel economy calibrating method of electronic control monoblock pump diesel engine model
CN101761407B (en) Gray system theory-based method for actively controlling fuel injection of internal combustion engine
DE102014211162B4 (en) Method and device for filling detection in a cylinder of an internal combustion engine
JP2004068729A (en) Adapting method for engine control parameter and its system
CN116591846A (en) Fuel injection control method and device, electronic equipment and storage medium
JP2012013637A (en) Adaptation method and adaptation device for engine control parameter
CN114839869B (en) ADRC gas injection amount closed-loop control method based on high-pressure natural gas circulating gas injection amount real-time detection
CN110594068B (en) Method, device and equipment for detecting fuel injection quantity and storage medium
JP5825663B2 (en) Lambda sensor extremely lean region responsiveness diagnosis method and common rail fuel injection control device
CN113326992B (en) Optimization method for smoke limit value of electric control diesel engine under working condition of rapidly increasing accelerator
CN204041250U (en) For engine intelligent controller and the Bench Test System of stand test
Jean et al. Trustworthy estimation and control of engine knocking level for transient operation
CN113803174B (en) Engine control method and device
CN105651323A (en) Active prediction method for soft fault of sensor based on GM (1, 1) model

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant