With increasing demand for high fuel efficiency, better exhaust control measures, comfort and high performance on current vehicles, electronic control of the throttle chamber, which decides the engine output, is getting advanced day by day. This trend is expected to continue for future as well. Highly accurate and high performance systems can be constructed by the use of electronic control of the throttle chamber, in idle air quantity control, torque control, traction control, etc.
In this paper, precise modeling, identification, and position control of an electronically controlled throttle system, that has heavy nonlinear characteristics of gear, negative pressure, and spring, was shown. System identification was carried out using GA, and using disturbance VSS observers. Sliding mode nonlinear control was proposed for stable and better control of the identified system considering the practical application. The effectiveness of the control method was verified using simulation and experimental results on an experimental system.