Patent ID: 6016790
Filing Date: 2000-01-25
Classification: F02B,F02D,F02M,F04B

Abstract:
A high-pressure pump comprising:a pump body;an inlet port provided in said pump body into which fluid is sucked;an outlet port provided in said pump body from which the fuel is discharged;a chamber formed within said pump body;a plunger slidably disposed within said chamber to define a pressure chamber whose volume is changed according to sliding movement of said plunger, the pressure chamber communicating with said inlet and outlet ports, pressurizing the fluid sucked from said inlet port, and discharging the pressurized fluid out of said outlet port;a fluid inlet line extending from said inlet port to said pressure chamber;a first valve disposed within said fluid inlet line, establishing fluid communication between said inlet port and said pressure chamber during a fluid suction operation wherein the fluid is sucked into said pressure chamber, while blocking the fluid communication between said inlet port and said pressure chamber during a fluid feeding operation wherein the fluid sucked into said pressure chamber is pressurized and discharged from said outlet port;a solenoid valve disposed within said fluid inlet line upstream of said first valve, electrically establishing and blocking fluid communication between said inlet port and said pressure chamber to control a flow rate of the fluid sucked into the pressure chamber through said first valve; anda control unit which controls a time when said solenoid valve is energized so that said solenoid valve starts to open a part of said fluid inlet line upstream of said first valve for establishing the fluid communication between said inlet port and said pressure chamber when said plunger reaches a position where the volume of said pressure chamber is minimized.