Internal-combustion engines – Charge forming device – With fuel pump
Patent
1986-06-11
1988-04-05
Cox, Ronald B.
Internal-combustion engines
Charge forming device
With fuel pump
123499, 417322, 417259, F02B 1500
Patent
active
047351853
ABSTRACT:
A fuel injection control apparatus includes a booster apparatus, in which a cylinder chamber is divided into first and second fluid chambers by a piston. The operative area of the piston facing the first fluid chamber is sufficiently greater than that facing the second fluid chamber. Pressurized fuel is supplied to the first fluid chamber through a first check valve. The fluid is delivered from a second fluid chamber to a fuel injection valve via a second check valve. A fluid passage is formed between the first and second fluid chambers. A third check valve is set in the fluid passage, whereby the fuel is allowed to flow only from the first fluid chamber toward the second fluid chamber. The booster piston is located by means of a first piezoelectric device which includes a plurality of piezoelectric elements stacked in layers. When high voltage is applied to the first piezoelectric device to extend it, the piston is moved toward the first fluid chamber. High-voltage power from a second piezoelectric device, which faces the inside of an engine cylinder, is supplied to the first piezoelectric device via a backflow-preventing element. The first piezoelectric device is controlled for discharge in response to the injecting timing.
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Imoto Yuzo
Sekiguchi Kiyonori
Wakata Hideo
Cox Ronald B.
Nippondenso Co. Ltd.
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