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Self-adaptive correction method for differences of fuel compositions of natural gas engine

A fuel composition and engine technology, applied in engine control, machine/engine, fuel injection control, etc., can solve the problems of increasing engine misfire, difficulty in guaranteeing engine rated power, limiting the operating range and operating quality of natural gas vehicles, etc., to achieve improved control horizontal effect

Active Publication Date: 2016-11-23
CHINA FIRST AUTOMOBILE
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Problems solved by technology

However, the composition of natural gas energy varies greatly due to different production areas. This compositional difference increases the risk of engine misfire, and the rated power of the engine is difficult to guarantee, thus limiting the operating range and quality of natural gas vehicles.

Method used

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  • Self-adaptive correction method for differences of fuel compositions of natural gas engine
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  • Self-adaptive correction method for differences of fuel compositions of natural gas engine

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Embodiment 1

[0041] In this embodiment, a natural gas engine fuel composition difference self-adaptive method relies on the composition of a nozzle 1 for gas fuel injection, a wide-area oxygen sensor 2 for mixed gas ratio feedback control, and an engine control unit (ECU) 3 A hardware device, the method specifically includes the following steps (such as image 3 shown):

[0042] 1. According to the engine speed and load conditions, the working condition area for activating the adaptive algorithm is divided:

[0043] A. When the speed is lower than the engine idle speed × 110%, and the load is lower than 20% of the maximum torque, it is divided into low speed and low load industrial and mining area (ArLk), which is recorded as working condition area 1;

[0044] B. When the rotational speed is higher than or equal to the engine rated rotational speed × 90%, and the load is lower than 20% of the maximum torque, it is divided into a high rotational speed and low load area (IjLk), which is rec...

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Abstract

The invention relates to a self-adaptive correction method for differences of fuel compositions of a natural gas engine. According to the method, on the basis of closed-loop control of mixed gas concentration, feedback parameters of closed-loop control of the mixed gas concentration serve as input of the self-adaption function, unidirectional control deviation existing for a long time serves as an independent correction in a self-adaption mode for adjusting gas feeding of the target fuel amount, and finally the closed-loop control parameters can be basically maintained at the original value level all the time. Firstly, working condition areas activating the self-adaptive algorithms are divided according to the rotation speed of the engine and the load conditions, then self-learning is carried out according to the feedback parameters of closed-loop control of the mixed gas concentration Lambda selected by the different working condition areas, and finally self-adaptive correction is carried out on the differences of the fuel compositions of the natural gas engine. The appropriate use condition of the engine can be reasonably selected according to the deviation generation mechanism of the mixed gas concentration, the running range of natural gas vehicles is expanded, and the running quality of the vehicles is improved.

Description

technical field [0001] The invention belongs to the field of engine control method development. Background technique [0002] Domestic heavy-duty natural gas engines for road vehicles adopt lean combustion technology. In order to meet better economy and emission levels, the set point of the general mixture concentration is close to the edge of misfire. However, the composition of natural gas energy varies greatly due to different production areas. This compositional difference increases the risk of engine misfire, and the rated power of the engine is difficult to guarantee, thus limiting the operating range and quality of natural gas vehicles. Contents of the invention [0003] In order to be able to reasonably select a suitable engine operating condition according to the mechanism of the deviation of the mixed gas concentration, the present invention provides a method for self-adapting to the difference in fuel composition of a natural gas engine. The method specifically ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14F02D41/24F02D41/18
CPCF02D41/0027F02D41/1459F02D41/1475F02D41/18F02D41/2445F02D41/2454F02D2200/0611F02D2200/101
Inventor 曹包华华东旭杨雪珠张俊杰祝浩李军张贵铭王超
Owner CHINA FIRST AUTOMOBILE
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