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In this paper, a calculation model of 491Q gasoline engine working process was established using the engine one-dimensional simulation software BOOST, and through the analysis on the curve of pressure fluctuation in the front of the inlet valve at the speeds, the relationship between the late closed angle of the inlet valve and the performance parameters of the engine was concluded, and the late closed angle of the inlet valve on the basis of the principle of camshaft phase modulation was determined and optimized. After the simulated calculation of the engine adopting the optimized late closed angle of the inlet valve was done again, the results show that when the late closed angle of the inlet valve on the engine lagged by 10°CA, the maximum power increased by 3.6%, the power and torque in the high speed zone were on average increased by 3% ~ 7%, and the fuel economy was also much improved.

Optimized Analysis on the Working Process of Engine Variable Gas Distribution Phase