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通过对４９２ＱＳ汽油机进气管的结构分析，设计带有节门的新型进气管，使其随转速的变化能自动打开或关闭，利用模拟计算的结果，在理论上进行分析对比，优化出最佳进气管．同时对原机的进气管也进行模拟计算．在此基础上对不同长度的进气管进行模拟计算，然后按优化的长度加工进气管，并设计了节门控制电路．最后对原机进气管和新设计的进气管装机进行实测．试验结果表明利用节门的打开和关闭可使发动机能兼顾高低转速时的性能指标．新设计的进气管优于原机的进气管，节门打开时使发动机的最大功率提高９．６７％，最大扭矩提高了１２．４％．研究结果表明这种带有节门的进气管是可行的，具有实际运用的价值．
Through the structural analysis of the inlet pipe of 492QS gasoline engine, a new type of intake pipe with a throttle is designed so that it can be automatically turned on or off with the change of speed. Based on the results of simulation calculation, the theoretical analysis and comparison are optimized to optimize trachea. At the same time, the intake pipe of the original machine is also simulated. On this basis, the intake pipe with different length is simulated and then the intake pipe is processed according to the optimized length, and the door control circuit is designed. Finally, the original machine intake pipe and the new design of the intake pipe installed for actual measurement. Test results show that the use of door opening and closing the engine can take into account both high and low speed performance. The newly designed intake pipe is better than the intake pipe of the original machine, when the door is opened, the maximum power of the engine is increased by 9.67% and the maximum torque is increased by 12.4%. The results show that this kind of door with throttle is feasible and has practical value.