Effect of engine speed and high pressure common rail fuel system parameters on pressure fluctuation of common rail pipe
In order to reduce the pressure fluctuation in the common rail pipe of the high-pressure common rail system of diesel engine,a one-dimensional simulation model of the high-pressure oil pump and common rail pipe of a diesel engine is established by AVL Boost Hydsim software,and the influence of the structural parameters of the high-pressure common rail system,such as the speed of the diesel engine,the diameter of the plunger,the volume of the plunger cavity,the number of plungers and the inner diameter of the common rail tube,the pressure fluctuation of the common rail tube is analyzed.The simulation results show that increasing the speed of the diesel engine,increasing the diameter of the plunger of the high-pressure oil pump,and decreasing the volume of the plunger cavity of the high-pressure oil pump can reduce the fluctuation of rail pressure.Increasing the inner diameter of the common rail tube can effectively suppress the pressure fluctuation.When the number of plungers changes so that the number of oil supply times is the same as the number of fuel injections of the injector,the degree of rail pressure fluctuation can also be reduced.
common rail tubepressure fluctuationfuel systemrotate speedplunger