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A Method for Determining Optimum EGR Rate of Supercharged Diesel Engine

A determination method and technology for diesel engines, applied in design optimization/simulation, special data processing applications, CAD numerical modeling, etc., can solve problems such as lack of theoretical guidance and difference in results, and achieve the effect of strong operability and improved rationality

Active Publication Date: 2022-04-12
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has a common shortcoming, that is, lack of clear theoretical guidance, and different researchers will have great differences in results due to differences in subjective judgments

Method used

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  • A Method for Determining Optimum EGR Rate of Supercharged Diesel Engine
  • A Method for Determining Optimum EGR Rate of Supercharged Diesel Engine
  • A Method for Determining Optimum EGR Rate of Supercharged Diesel Engine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Such as figure 1 , a method for determining the optimal EGR rate of a supercharged diesel engine:

[0055] Step (1): Construct the effect sample matrix for initial modeling:

[0056] Collect test data corresponding to different EGR rates under each working condition to form an effect sample matrix The situational decision-making of each EGR rate scheme is carried out under the same experimental conditions; the main EGR performance parameters are selected as the decision-making objectives, and the lower-limit effect measurement is adopted for each decision-making objective:

[0057]

[0058] pair effect sample matrix The form is optimized, and the sample matrix based on the optimization effect is obtained Use the traditional gray decision model for initial modeling:

[0059]

[0060] In the above formula, the matrix u ij 'The row vector represents the decision target, the matrix u ij ' The column vector represents the EGR rate, Represents the effect samp...

Embodiment 2

[0094] Embodiment 2: A method for determining the optimal EGR rate of a supercharged diesel engine:

[0095] Step (1): Obtain the main operating parameters of the supercharged diesel engine under different working conditions and different EGR rates through experiments. This implementation mode selects the test data of the TBD234V12 type sequential supercharged diesel engine of Harbin Engineering University, respectively selects the test data of 5 different EGR rates under 9 working conditions, and mainly selects parameters such as fuel consumption, in-cylinder explosion pressure, NOX, CO and soot, the specific test data are shown in Table 1:

[0096] Table 1 Partial operating point test data

[0097]

[0098] Step (2): Using the multi-objective gray situation decision-making method to initially model the EGR decision-making problem. Taking the OP1 working condition as an example, the specific steps are as follows:

[0099] Step (2.1): First determine the decision-making ...

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Abstract

The invention discloses a method for determining the optimal EGR rate of a supercharged diesel engine, which belongs to the field of diesel engine control and solves the problem of inaccurate EGR rates in the prior art. Modeling; step (2): define the optimal sequence and subsequence, construct the optimal correlation analysis model, and solve the optimal correlation degree; step (3): assign NOX weight according to the different loads of diesel engines; step (4): solve the comprehensive weight Vector; Step (5): Substituting the initial modeling to obtain the comprehensive evaluation value, sorting the performance of different EGR rates, and obtaining the best EGR rate under the current working condition. The invention takes both subjectivity and objectivity into account, improves the rationality of decision-making results, theoretically ensures that the decision-making results are closer to actual conditions, has strong operability, and is easy to apply in actual operations.

Description

technical field [0001] The invention belongs to the field of diesel engine control, in particular to a method for determining the optimal EGR rate of a supercharged diesel engine. Background technique [0002] EGR is the abbreviation of Exhaust Gas Recirculation, which is a technology that separates a part of the exhaust gas after combustion in the internal combustion engine, and introduces it into the intake side to make it burn again. The main purpose is to reduce the nitrogen oxides in the exhaust gas and improve the fuel consumption rate when sharing part of the load. [0003] Exhaust gas recirculation is currently the main measure to reduce NOX emissions from diesel engines. Its realization process is mainly to introduce part of the exhaust gas into the intake pipe, mix with fresh air and enter the cylinder to participate in the combustion process again. The key to EGR technology is to make enough exhaust gas return to the intake pipe, overcome the difficulty of EGR ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F111/10
CPCG06F2111/10G06F30/20
Inventor 王银燕祖象欢崔欣洁杨传雷王贺春史明伟
Owner HARBIN ENG UNIV