关键词: 电控单元, 均质充量压缩燃烧, 控制策略, 全可变气门机构

Abstract: In order to study homogeneous charge compression ignition HCCI combustion, a fully variable valve train is developed. It includes four independent variable parameters of both inlet and exhaust variable valve timing & lift. Meanwhile, with the aim of investigating variable valve actuation (VVA) control strategy, a research platform which includes an AC motor, a 16-bit elec-tronic control unit, avhydraulic system and a PC for experiment management is established to simulate engine operation. VVA control strategy is researched and evaluat- ed detailedly for the platform can simulate engine’s operation. After deep ex-perimental investigation of a close loop control strategy for variable valve timing and variable valve lift is achieved. It can adjust the inlet & exhaust valve lift between 0 mm and 9.7 mm continuously. Furthermore, the valve timing can vary within 60° continuously. Experimental results show that the control strategy can control the dynamic process quickly, precisely and stably, which establishes the foundation of improving gasoline engine’s efficiency and controlling HCCI combustion.

Key words: Control strategy, Electronic control unit, Homogeneous charge compression ignition, Variable valve actuation