关键词: 电子节气门；状态空间模型；传递函数；非线性因素

Abstract: There are many nonlinear factors in the mechanical structure of electronic throttle, which is the key technical problem affecting throttle control. The control principle of the electronic throttle control system is analyzed. The torque transmission process of the electronic throttle body is deducted. The nonlinear factors and their respective characteristics in the throttle mechanical structure, such as return spring, air flow impact, coulomb stick slip friction and so on, are puts forward. The key parameters of electronic throttle are identified, and the dynamic equation throttle drive motor, motor shaft, throttle shaft and state space model of electronic throttle system are established. The coefficients in the state space model of typical throttle actuator are calculated. Various parameters in a certain electronic throttle state space model were identified through dynamic characteristic analysis. The state space model of throttle actuator provides a theoretical basis and method for rapid and accurate control of electronic throttle.

Key words: Electronic throttle; State space model; Transfer function; Nonlinear factors