Experimental study on sound quality improvement of a diesel engine for forklift trucks under acceleration conditions
In order to reduce the noise in the acceleration process of a forklift diesel engine,the causes of the abnormal sound of the diesel engine and the influence of the fuel injection regularity on the acceleration noise are studied experimentally.The sound quality parameters are analyzed and the improvement scheme is proposed.The test results show that the"rattling"sound during rapid acceleration of the diesel engine is caused by the excessive pressure rise rate in the cylinder during the combustion process.Increasing the pre-injection fuel quantity can reduce the noise level to a certain extent,but it has little effect on the accelerating abnormal noise.Reducing the fuel injection advance angle can slightly reduce the acceleration abnormal noise.Reducing the rail pressure rise rate can significantly reduce the acceleration abnormal noise.The rail pressure rise rate is reduced from 150 MPa/s to 100 MPa/s.The abnormal noise disappears when the diesel engine is accelerating.The change trend of loudness is basically consistent with the sound pressure level.The sharpness and roughness are reduced,and the sound quality is significantly improved.
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