Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1996-08-21
1998-01-27
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Fuel injection system
123511, 12317917, F02M 4100
Patent
active
057112754
ABSTRACT:
A fuel pump is driven by a variable, constant current, control circuit. A pressure control valve disposed between the fuel pump and a fuel rail includes a downstream pressure control valve and a bypass valve bypassing the downstream pressure control valve. The downstream pressure control valve sets the fuel pressure in the fuel rail to a predetermined value by opening or closing a passage from a fuel pipe to the fuel rail. If the fuel pump discharge pressure is sufficiently increased, the bypass valve is opened when the upstream fuel pressure is larger than the downstream fuel pressure by at least a predetermined differential pressure. In this way, fuel is supplied to raise the fuel rail fuel pressure. Therefore, it is possible during other times to reduce the consumed electric power of the fuel pump and thus prolong its life.
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USSN 08/694065 F. Aug. 1996 Appln. of Minagawa et al.
Arai Katsumi
Minagawa Kazuji
Oi Kiyotoshi
Kyosan Denki Co. Ltd.
Moulis Thomas N.
Nippondenso Co. Ltd.
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