摘要
宽域废气氧传感器在汽车发动机空燃比控制系统中应用广泛,它对工作温度有严格要求,可通过控制泵电流实现空燃比测量。笔者研究温度和泵电流控制方法。将冷启动和PI控制方法相结合,缩短了传感器冷启动时间并提高了温度控制精度;针对泵电流模型参数的不确定性,研究了基于H∞回路成形的鲁棒PID参数整定方法。仿真实验结果表明:宽域废气氧传感器冷启动速度快,温度控制精度较高;泵电流控制调节时间短,稳态精度高。
The universal exhaust gas oxygen （UEGO） sensor widely used in air-fuel ratio control system of the automobile engines has strict request for working temperature and has air/fuel ratio measured by controlling the pump current. In this paper, the control methods for both working temperature and pump current were dis- cussed, in which, having cool start control and PI control combined to shorten sensor＇ s cool start time and to improve temperature control precision. Considering uncertainty of the pump＇ s current model parameter, a ro- bust PID parameter tuning method based on H∞ loop shaping was studied. The simulation experiment shows that, the universal exhaust gas oxygen sensor has shorter start-up time and higher temperature control preci- sion; and the setting time of pump current control is short together with a high static accuracy.
出处
《化工自动化及仪表》
CAS
2017年第2期156-160,共5页
Control and Instruments in Chemical Industry
