Study on a Novel Variable Valve Timing and Lift Mechanism for a Miller Cycle Diesel Engine

Thermal efficiency and power density improvement are the main research foci of literature on diesel engines. The Miller cycle is considered to be one most promising methods engine operation. In this study, a fully variable valve timing lift mechanism (CD-HFVVS) was studied determine possibility Firstly, seat impact buffer in tested, which proved that can effectively eliminate impact. Then influences different speeds oil temperatures were studied. results show opening duration prolonged when speed increases, reduced while temperature increased. adjusted by changing discharge position initial plunger position, further proves CD-HFVVS achieve performance optimization cycle. By using mechanism, single cylinder test performed. inlet timing, fuel improved peak pressure in-cylinder average both suppressed.