Weber self single/even recognition and automatic combustion-rule empirical parameter calibration method

A technology of empirical parameters and automatic calibration, which is applied in the direction of internal combustion engine testing, engine testing, measuring devices, etc., can solve the problem of high difficulty in calibration

Inactive Publication Date: 2017-06-30
HARBIN ENG UNIV
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Problems solved by technology

Studies have shown that the single-Wiebe combustion rule is only suitable for the combustion process simulation of one combustion phase or two combustion phases with slight mixing, but it cannot achieve good simulation for the combustion process with obvious two combustion phases mixed
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  • Weber self single/even recognition and automatic combustion-rule empirical parameter calibration method
  • Weber self single/even recognition and automatic combustion-rule empirical parameter calibration method
  • Weber self single/even recognition and automatic combustion-rule empirical parameter calibration method

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Embodiment Construction

[0018] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0019] combine figure 1 , the single and double Wiebe combustion rules commonly used in the zero-dimensional combustion modeling of internal combustion engines, respectively, the parameter equations shown in formula (1) and formula (2).

[0020]

[0021]

[0022] In formula (1): x b is the percentage of burned fuel; m is the combustion quality index; a is the combustion efficiency factor; — Instantaneous crankshaft angle; — combustion duration angle; - The starting point of combustion. where m, a, and and are empirical parameters to be calibrated. In formula (2): x b is the percentage of burned fuel; m 1 and m 2 are the combustion quality indices of the first and second Wiebe equations respectively; a 1 and a 2 are the combustion efficiency factors of the first Weber (Wiebe) and second Weber (Wiebe) equations; — Instantaneous crankshaft an...

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Abstract

The purpose of the present invention is to provide an automatic calibration method for empirical parameters of self-identifying single and double Weber combustion rules. The present invention judges the number of Weber equations to be selected according to the burnt fraction test data: when the number of Weber equations is 1, algebraic analysis is used to obtain the preliminary estimated value of the Weber parameter, and then the least square algorithm is used to obtain the final estimated value. When the number of Weber's equations is 2, the combustion phase separation point is obtained by using the combustion phase separation point determination method, and the burned fraction test data is divided into two parts according to the combustion phase separation point and processed accordingly. The preliminary estimated value of Weber parameter was obtained through analysis, and then the final estimated value was obtained by using the least squares algorithm. The invention can realize the self-identification of the number of Weber equations and automatically calibrate the parameters of the Weber equations, so that a zero-dimensional combustion model based on Weber's combustion rules can be quickly and accurately built, and the stability and optimality of the calibration results can be guaranteed.

Description

technical field [0001] The invention relates to a method for calibrating combustion parameters of an internal combustion engine. Background technique [0002] In order to solve the increasingly serious environmental pollution problem, the international emission regulations are becoming more and more stringent, restricting the harmful emissions of the engine, so that the manufacturers regard the emission control of the engine as particularly important. The emission characteristics of diesel engines are closely related to the combustion process in the cylinder, so realizing the real-time control of the combustion process is of great significance to the emission control of the engine. With the rapid development of computer technology, computer simulation technology has a vigorous vitality. Through the abstract imitation of the real system, the system model is abstracted, and people conduct simulation experiments on such models on the computer, which saves scientific research an...

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Application Information

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IPC IPC(8): G01M15/04
CPCG01M15/042
Inventor 王银燕胡松王贺春杨传雷袁帅周鹏程吕游刘晓梅杨鹏
Owner HARBIN ENG UNIV
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