多缸汽油机空燃比测量与研究

Measurement and Research of Air Fuel Ratio for Multicylinder Gasoline Engine

Air fuel ratio is the criterion to evaluate mixture concentration, and also an important sensitive factor to effect combustion process. The efficient operation of gasoline engine is markedly dependent on the air fuel ratio of the charged mixture. With respect to automotive multi-cylinder gasoline engine, in order to achieve optimum performance, maximum fuel economy and minimum emission, greater attention must be paid to the characteristic of engine air fuel ratio and its distribution evencss of cylinder to cylinder. This paper mainly describes the method and theery of air fuel ratio measurement, analyses the characteristic of engine air fuel ratio and its distribution eveness of cylinder to cylinder, proposes the detailed means to improve fuel economy of automotive multi-cylinder gasoline engine.