增程器用天然气发动机转速双闭环自适应控制

CNG engine dual closed speed control with adaptive strategy in range-extended electric vehicles

针对增程器用天然气发动机参数不确定,输出扭矩难以精确计算,存在未知干扰,且需要大范围调速等问题,设计发动机转速的双闭环自适应控制策略,并分析系统的稳定性.所提策略的外环为发动机转速环,控制器输出为目标进气压力,内环为进气歧管压力环,控制器输出为节气门开度.该策略结构简单,不需要知道发动机各个参数的具体值,抗干扰性能强,能够满足增程器发动机大范围调速的特点.分别在Matlab/Simulink平台和增程器台架上验证了所提策略的有效性和实用性.

This paper presents an adaptive dual closed loop speed control strategy for natural gas engine used in a range extender to improve the robustness against parameter uncertainties,unmodeled dynamics and unknown disturbance.The outer loop of the strategy is the speed control,the output of which is the target intake manifold pressure.The inner loop is the adaptive control of intake manifold pressure,and the output is the angle of the throttle valve.The strategy is realized in simple structure without the knowledge of the specific values of the engine parameters.Theoretical analysis indicates that the controller can meet the demands of the wide range speed regulation of the range extender engine in the presence of model errors and unknown disturbance.Finally,the effectiveness and practicability of the controller are verified in both simulation in the environment of Matlab/Simulink and experiment in a range extender.