王都，王俊席，任鹏飞，冒晓建   

     摘要：点燃式天然气发动机的空气流量计算精度决定了发动机空燃比控制精度，常用的速度密度法计算空气流量时，计算偏差较大，瞬态时发动机响应滞后。采用节气门流量模型是改善发动机瞬态控制的有效方法，试验表明，采用节气门流量模型后，发动机加速响应性能大大提高。

    关键词：电子节气门；流量模型；天然气发动机

    Abstract: The air-fuel ratio control effect of a spark-ignition (SI) natural gas engine depends on the air flow calculation accuracy. When air flow is calculated with the speed-density method, the deviation is large and the engine retards to response in the transient state. The throttle flow model is an effective method to improve engine transient response. The experiment indicates that the engine acceleration response performance is greatly improved with the throttle flow model

    Key words: Electronic Throttle; Flow Model; Natural Gas Engine