基于氧传感器模型的空燃比精确控制器开发

李捷辉; 刘婧; 吴兵兵; 张隆基; 胡立

doi:10.3969/j.issn.1001-2222.2018.04.003

车用发动机 >

2018 , Vol. 0 >Issue 4: 11 - 16

DOI: https://doi.org/10.3969/j.issn.1001-2222.2018.04.003

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基于氧传感器模型的空燃比精确控制器开发

李捷辉 ,
刘婧 ,
吴兵兵 ,
张隆基 ,
胡立

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（江苏大学汽车与交通工程学院，江苏镇江 212013）

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Development of AFR Accurate Controller Based on Oxygen Sensor Model

LI Jiehui ,
LIU Jing ,
WU Bingbing ,
ZHANG Longji ,
HU Li

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(School of Automotive and Traffic Engineering,Jiangsu University,Zhenjiang 212013,China)

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摘要

氧传感器在发动机运行过程中由于长期使用或环境恶劣等因素将导致其信号失真，为此提出模型算法替代氧传感器实物的思路，根据模型设计理念，设计一种实现空燃比精确控制的控制器。在Matlab/Simulink环境下，搭建空燃比控制器算法模型，主要包括氧传感器信号计算模块、模式调度模块和PI控制器模块。将由空燃比算法模型所得空燃比输入氧传感器模型，得到氧传感器信号值，将该信号值反馈到PI控制器模块中，进行喷油量修正，使空燃比控制在14.7附近。试验结果表明，该控制系统在没有使用氧传感器的条件下可将空燃比精确控制在14.31~15.01范围内。与装有氧传感器的电控原机相比，排放性能相似。

关键词： 氧传感器; 模型; 空燃比; 控制器; 汽油机

本文引用格式

李捷辉 , 刘婧 , 吴兵兵 , 张隆基 , 胡立 . 基于氧传感器模型的空燃比精确控制器开发[J]. 车用发动机, 2018 , 0(4) : 11 -16 . DOI: 10.3969/j.issn.1001-2222.2018.04.003

Abstract

In order to avoid the unstable performance of oxygen sensor due to bad environment or longtime working, the idea of replacing oxygen sensor with algorithm model was put forward and then the controller for the precise control of airfuel ratio(AFR) was designed. Under the environment of Matlab/Simulink, the AFR controller model was established including AFR calculating module, model scheduling module and PI control module. The signal of oxygen sensor was calculated in oxygen sensor model according to the AFR calculated by the AFR calculating model and was then fed back to the PI controller to correct the fuelinjection quantity. The results show that the control system can accurately control the airfuel ratio within the range of 14.31-15.01 without using an oxygen sensor. Compared with the original electrically controlled engine with oxygen sensor, the emission performance is similar.

Key words： oxygen sensor; model; air fuel ratio; controller; gasoline engine

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