Influence of VVT on Engine Fuel Economy under Low Speed and Low Load

The B15 DVVT engine VVT working point was selected as an example to outline the principle of VVT working point selection for intake and exhaust through comparing engine performance before and after VVT working point selection.Under the engines low speed and middle-low load condition,a series of experiments illustrated VVT working point selections effect on power,fuel economy and emissions performance.After a comprehensive analysis,the goal of optimizing the performance was finally achieved for this engine working zone through proper VVT working point selection.