Patent ID: 6401691
Filing Date: 2002-06-11
Classification: F02M

Abstract:
A method of designing a fuel supply system for an internal combustion engine including a fuel pump for pressurizing fuel, a high pressure fuel pipe for delivering the pressurized fuel to a plurality of injectors, and at least one delivery pipe installed in the high pressure fuel pipe for distributing the pressurized fuel to the injectors, for reducing pressure pulsation of the fuel in the high pressure fuel pipe, said designing method comprising the steps of:determining a target frequency, for preventing a resonance among harmonics of the pressure pulsation in the high pressure fuel pipe, from the largest number of speed of the fuel pump and an order frequency of the harmonics whose resonance should be prevented; calculating a resonance frequency corresponding to a predetermined design data of the system; changing design data of the system such that said calculated resonance frequency becomes greater than said target frequency; calculating a waveform of the pressure pulsation of the fuel in the high pressure pipe by a numerical analysis; determining said order frequency of said harmonics, whose resonance should be prevented, from a peak of an amplitude of said calculated waveform of the pressure pulsation; calculating a magnitude of a pulsation pressure from a height of said amplitude; and changing design data of the system such that said pulsation pressure becomes less than a predetermined target value.