Reduction of Pump Pulsation Noise by Using Robust Design Method

Abstract

In the past decade, high-pressure direct injection systems in petrol engines have widely penetrated in the market supported by the raising environmental consciousness. The essential component of a gasoline direct injection system is the high-pressure fuel pump, which pressurizes the petrol as high as 20MPa. High-pressure fuel pump commonly used is single-cylinder type driven mechanically by the cam-shaft. This typically generates inherent undesirable high pressure pulsation noise which renders the sound of the traditionally petrol engine similar to that of a common-rail diesel engine. In this paper, we will describe the method we deployed to mitigate the high pressure pulsation noise. We applied Taguchi methodology to search for the sensitive design parameters. As a result, by modifying design parameters of the outlet valve, we confirmed 48% reduction of pulsation noise.