Common-rail fuel injection system for an engine

Details Common-rail fuel injection system for an engine Common-rail fuel injection system for an engine

1992-02-27

1994-01-11

Miller, Carl S.

Internal-combustion engines

Accessories

Covers, trays, vibrators, corrosion inhibitors, air filters

123456, 123333, F02B 7700, F02M 4100

Patent

active

052771563

ABSTRACT:
A common-rail fuel injection system for an engine includes a fuel injection device for injecting high pressure fuel from a common rail into the engine. A pumping chamber is connected to the common rail. A fuel feed device serves to feed fuel to the pumping chamber. A plunger moves upward and downward in accordance with rotation of an output shaft of the engine. The plunger defines a part of the pumping chamber. A relief valve serves to selectively return fuel from the pumping chamber to a low pressure side via a fuel return passage. The relief valve is urged toward its closed position by a pressure of the fuel in the pumping chamber. A valve closing device serves to close the relief valve. A fuel pumping control device serves to drive and control the valve closing device at a given timing to close the relief valve, thereby enabling a pressure in the pumping chamber to increase in accordance with upward movement of the plunger and pumping a given amount of fuel from the pumping chamber to the common rail. An engine speed detecting device serves to detect a rotational speed of the output shaft of the engine. In cases where an engine rotational speed detected by the engine speed detecting means is equal to or higher than a predetermined reference speed, a fuel feed suspending device serves to suspend fuel feed to the pumping chamber by the fuel feed means.

REFERENCES:
patent: 4083346 (1978-04-01), Eheim
patent: 4195610 (1980-04-01), Bastenhof
patent: 4403580 (1983-09-01), Bader
patent: 4565170 (1986-01-01), Grieshaber
patent: 4597369 (1986-07-01), Yasuhara
patent: 4777921 (1988-10-01), Miyaki et al.
patent: 4807583 (1989-02-01), Thornwaite
patent: 4862849 (1989-09-01), Wilson
patent: 4940034 (1990-07-01), Heim et al.
patent: 5058553 (1991-10-01), Kondo
patent: 5070848 (1991-12-01), Mitsuyasu

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