基于新型点火方式和燃烧循环内离子电流/缸压协同控制实现汽油机50%热效率的超稀薄燃烧基础研究

针对高效汽油机超稀薄燃烧的关键科学问题，围绕新型点火和缸内燃烧诊断控制方法，以直喷汽油机燃烧过程为研究对象，基于高背压定容燃烧弹，试验及仿真研究超稀混合气的基础燃烧特性、稳定着火边界以及不同因素的影响规律；基于高压缩比VVA直喷汽油机试验平台，研究不同新型预燃室火花塞、多极点火方式对超稀薄燃烧的失火和爆震边界拓展及稳定燃烧控制的影响因素和实现的新方式；同时研究新型基于缸内离子电流和缸压信号协同的智能信息融合实现着火及燃烧的实时反馈控制的方法，探索超稀薄燃烧效率优化及稳定性控制的新途径，研究拓宽高压缩比汽油机超稀薄燃烧的当量比边界及爆震边界的影响因素和控制方法；通过新型点火和缸内燃烧循环的实时智能反馈控制，探索汽油机热效率50%达成的方法，为工业界的工程样机设计提供新的燃烧基础数据和技术支撑。项目申请人及所在课题组及实验室所开展的前期基础研究工作为本项目的实施和完成提供了良好的条件和保障。

Aiming at the key scientific problems of ultra-lean combustion in high-efficiency gasoline engines, the new ignition and in-cylinder combustion diagnosis and control methods are used to study the combustion process of a direct-injection gasoline （GDI）engine. Based on a high-backpressure constant-volume combustion bomb, experiments and simulations are conducted to study the basic combustion characteristics of ultra-lean gasoline mixtures, then the ignition boundary conditions and the effect of different operating factors will be studied based on the high compression ratio direct injection gasoline engine with a VVA system, the research on different novel spark plugs with pre-combustion chamber, and the spark plug with multi-electrodes will be conducted to study their effect on expanding the mixture lean limit and achieving the stable in-cylinder combustion control; a novel intelligent in-cylinder combustion detecting method based on the synergy of ion current and cylinder pressure signals will be developed to realize a real-time feedback control of ignition and combustion event on the GDI engine, then the stabilization the ultra-lean combustion and the engine efficiency improvement can be achieved through this feedback control, and then the control strategy can be developed to broaden the equivalence ratio limit and detonation limit of the ultra-lean combustion on high compression ratio gasoline engines; Finally, a method which achieving 50% thermal efficiency on gasoline engines through novel ignition system and the intelligent in-cylinder combustion feedback control will be investigated, and the method can be applied to support the development of the 50% thermal efficiency gasoline engine prototype for the IC engine industry by providing the fundamental data and technique solutions. The preliminary research carried out by the project applicant and his research team can provide good conditions and guarantees for the implementation and completion of this project.