Analysis and Improvement of Squeak and Knock Noise of Diesel Engine Idling Acceleration
The high compression ratio of the diesel engine causes rough combustion and a strong combus-tion sound.This paper analyzes the causes of the abnormal knocking sound caused by the rapid accelera-tion of diesel engine idling in detail.It is found that for naturally aspirated diesel engines,adjusting the pre-injection advance angle and rail pressure rise rate under the special condition of rapid acceleration of no-load has great benefits in improving the combustion knock squeak noise.When the injection advance angle is controlled in the range of 5-11°and the rail pressure rise rate is controlled at 100 MPa,the com-bustion sound becomes soft,the knocking noise disappears,and the pre-injection amount contributes less to the sound improvement.
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