초록 ▼

A damping chamber is formed in a pressure relaxation device connected to a high pressure fuel pipe. Valve bodies are provided at openings of partitions, and a spring force is applied to the valve bodies by a spring in a valve closing direction. When a high pressure portion reaches an inlet of the da

A damping chamber is formed in a pressure relaxation device connected to a high pressure fuel pipe. Valve bodies are provided at openings of partitions, and a spring force is applied to the valve bodies by a spring in a valve closing direction. When a high pressure portion reaches an inlet of the damping chamber, the valve body opens to hold and absorb the high pressure portion in the damping chamber. When a low pressure portion reaches the inlet of the damping chamber, the high pressure portion held in the damping chamber is gradually released via a restricted orifice to cancel the low pressure portion, thereby reducing the pressure pulsation of fuel.

대표청구항 ▼

1. 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 distribu

1. 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.