Technical Paper
Investigation on the Highly Precise Air Fuel Ratio Adaptive Control in Transient States under Changes in the Intake Valve Opening Timing
2014-04-01
2014-01-1162
This paper investigated highly precise control of the air fuel ratio (AFR) of a gasoline engine in a transient state acceleration or deceleration at several starting engine speeds and several intake valve opening (IVO) timings. First, a two-input and one-output linearized engine model was developed for the design of the AFR control system. In order to compensate for the AFR deterioration caused by the actuation of the throttle valve during acceleration or deceleration, a feed-forward (FF) controller was developed based on the model. In order to add adaptability to the FF controller, a compensation using an error value from the AFR target value was equipped. The feedback (FB) system was designed using a backstepping method that is well known as an adaptive controller for a non-linear system.
