汽车发动机怠速抖动机理研究

Studies on Automobile Engine Idle Wobbling Mechanism

汽车发动机怠速抖动是实际运用中的一个难题。讨论了发动机机体正常振动时的激振源和振动形式,并运用机械振动理论,研究了怠速抖动时它们的变化。指出,由于发动机的各种故障会引起个别气缸气体作用力减小,导致总的反倒力矩平衡性恶化,致使发动机横向摆动加大,出现怠速抖动。对发动机进行了振动试验,验证了结论。为解决发动机怠速抖动问题及改进设计提供了理论指导。

Idling engine wobble is a trouble in applications of automobile.The paper discusses the exciting vibration sources and forms while engine normal vibrating,and studies how they change when idling engine is wobbling by means of mechanic vibration theory.It is pointed that engine's various faults can make the gas acting pressure lower in individual cylinders,resulting in the unbalance of gross overturn moment,with more engine side vibration,so comes idling engine wobble.An engine is tested and the test results validate the conclusions that offer a theoretical guidance for solving idling engine wobble and improving engine's design.