A Simulation for Indentifying Influence of The VVT Effect on The SI Engine Performance Using WAVE

WAVE 를 이용한 VVT 효과가 SI 엔진성능에 미치는 영향에 관한 시뮬레이션

Variable Valve Timing (VVT) system can be used to improve fuel economy, performance and emissions. This study is identified the effect of VVT in terms of wide open throttle torque, Residual gas fraction, volume efficiency. Engine cycle simulations are performed on 2.0L DOHC in-line 4-cylinder SI engine by using WAVE of Ricardo. Results of the simulations had good agreement with WOT torque experimental data, and helped to predict the tendency of performance as the valve timings change. WOT torque was higher when intake valves were closed early for low rpm and late for high rpm.