Study on the pressure fluctuation characteristics of the high-pressure common rail system with a distributor

Abstract In allusion to the problem of common rail pressure fluctuation when the high-pressure common rail system (CRS) using double rails, a numerical simulation model of a V-type 8-cylinder engine CRS was established by using AMESim software, and the suppression of pressure fluctuation with and without distributor was studied. The optimum structure dimension of the distributor with length of 100 mm and inner diameter of 9 mm was obtained by uniform design method. Then the pressure surge characteristics of CRS was researched. The research results showed that the installation of the distributor cut down the amplitude of the pressure oscillation of the common rail by more than 62.28%. Therefore, the designed distributor can effectively suppress the rail pressure fluctuation and improve CRS stability.