Fuel injection pump for an internal combustion engine

Details Fuel injection pump for an internal combustion engine Fuel injection pump for an internal combustion engine

1987-09-02

1988-12-27

Miller, Carl S.

Internal-combustion engines

Charge forming device

With fuel pump

123498, 123500, F02M 3900

Patent

active

047933143

ABSTRACT:
A fuel injection pump including a valve opening and closing an overflow passage formed in a body of the pump to connect a high pressure chamber to a low pressure chamber. The low pressure chamber is provided for reserving low pressure fuel, and the high pressure chamber is provided for pressurizing fuel sent from the low pressure chamber and for discharging the pressurized fuel to fuel injectors. A plunger has intake grooves which open the feed passage to communicate the high pressure chamber with the low pressure chamber on an intake action of the pump. The body of the pump has a feed passage formed therein which connects the high pressure chamber to a control chamber. The pressure in the control chamber is changed by the expansion and contaction of a piezoelectric actuator, and the pressure in the control chamber urges the valve in a direction in which the valve closes the overflow passage. A start and end of a fuel injection period, and a fuel injection ratio (a pilot fuel injection), can be controlled by the opening and closing of the valve.

REFERENCES:
patent: 3465732 (1969-09-01), Kattchee
patent: 3589345 (1971-06-01), Benson
patent: 4562810 (1986-01-01), Miyaki
patent: 4610427 (1986-09-01), Igashira et al.
patent: 4622942 (1986-11-01), Nozaki
patent: 4643155 (1987-02-01), O'Neill
patent: 4697565 (1987-10-01), Kobayashi

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