基于喷射量波动的燃气发动机空燃比自适应控制器设计

孔雪艳¹，杨君¹，王明杰²，王健¹，黄万友¹

1.山东交通学院汽车工程学院，山东 济南  250357；2.山东交通学院机动车检测实验中心，山东 济南  250357

摘要：为降低燃气喷射量波动对空燃比的影响，设计基于喷射量波动的燃气发动机空燃比自适应控制器。采用李雅普诺夫方法来确定控制律参数，利用Matlab/Simulink仿真平台，搭建天然气发动机空燃比控制模型。通过仿真验证3种运行工况下该自适应控制器的有效性。结果表明，当发动机燃气喷射量波动时，自适应控制器可以将燃气发动机的空燃比控制在理想值附近，有效降低燃气喷射量不确定对空燃比控制精度的影响。

关键词：燃气发动机；喷射量波动；空燃比；自适应控制

Design of air-fuel ratio adaptive controller based on injection quantity fluctuation for gas engine

KONG Xueyan¹, YANG Jun¹, WANG Mingjie², WANG Jian¹, HUANG Wanyou¹

1.School of Automotive Engineering, Shandong Jiaotong University, Jinan 250357，China；

2. Motor Vehicle Testing Center, Shandong Jiaotong University, Jinan 250100，China

Abstract：In order to reduce the influence of the uncertainty of fuel injection quantity on the air-fuel ratio, an adaptive air-fuel ratio controller based on the fluctuation of fuel injection quantity is designed. Lyapunov method is used to determine the parameters of the control law, and Matlab/Simulink simulation platform is used to build the air-fuel ratio control model of natural gas engine. The effectiveness of the adaptive controller under three operating conditions is verified by simulation. The results show that the adaptive controller can control the air-fuel ratio of the gas engine near the ideal value when the fuel injection quantity of the engine fluctuates, and effectively reduce the influence of the uncertainty of the fuel injection quantity on the control accuracy of the air-fuel ratio.

Keywords:gas engine; injection quantity fluctuation; air-fuel ratio; adaptive control