基于ETAS系统的车用氧传感器综合性能测试

Experimental Research on ETAS System for Automobile Oxygen Sensor Performance Testing

为减少汽车尾气对环境造成的污染,通过对发动机空燃比的控制方式和控制要求的研究,制定了发动机在3个工况下空燃比的控制策略:稳态部分负荷工况,采用开环与闭环控制相结合,开环环节采用查MAP图的形式,确定基本喷油量,以EGO信号为反馈信号,实行空燃比闭环控制;瞬态工况,运用开环控制,采用进气管压力观察器理论和动态油膜补偿模型,精确计算进气量和对燃油的补偿;怠速工况,转速稳定性采用闭环控制,以转速为反馈信号,喷油控制采用空燃比闭环控制。在Matlab/Simulink环境中分别进行建模,最后通过搭建的试验台进行了测试实验。结果表明,被测氧传感器的测试性能与标准氧传感器的参考数据相同。

In order to reduce the environmental pollution caused by automobile exhaust,through the research of the engine air-fuel ratio control methods and control requirements,this paper developed three air-fuel ratio control strategies required by the experimental conditions： steady-state and part-loaded conditions,transient conditions,idling conditions. The paper modeled the air-fuel ratio control in the three modules in the Matlab / Simulink environment,and designed different PID control laws. On this basis,the test bench system of oxygen sensor performance testing was developed and detailed analysis on the relevant characteristic curve of the oxygen sensors was conducted. The oxygen sensor performance testing experiment was carried out. By comparing the experiment measured data with the standard data of the oxygen sensor performance,they matched well each other. Also the developed test bench has certained reference values for oxygen sensor performance testing and experimental study.