目前,我国汽油机的热效率低,指示热效率η只有24～33%,有效热效率η.也仅20～30%,因此提高热效率是汽油机节能的根本措施,而提高压缩比又是提高汽油机热效率的重要途径. 提高汽油机的压缩比可以提高汽油机的动力性与经济性,但提高压缩比受到爆震的限制,压缩比过高,产生爆震,动力性和经 At present, the thermal efficiency of gasoline engines in our country is low, indicating only 24-33% of the thermal efficiency η and only 20-30% of the effective thermal efficiency η, so improving the thermal efficiency is the fundamental measure to save energy of the gasoline engine, and increasing the compression ratio is an important way to improve the thermal efficiency of the gasoline engine. Increasing the compression ratio of the gasoline engine can improve the power and economy of the gasoline engine, but increasing the compression ratio is limited by the detonation, the compression ratio is too high, and the detonation, the power and the