Fuel injection control device for internal combustion engine

Details Fuel injection control device for internal combustion engine Fuel injection control device for internal combustion engine

1994-01-19

1995-12-26

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

310316, F02D 4120

Patent

active

054778310

ABSTRACT:
An excess voltage applied to a piezoelectric element is detected and controlled to improve durability and reliability of the piezoelectric element. A fuel injection control device for an internal combustion engine in which a power source voltage is boosted by a dc-dc converter and the so-boosted output voltage is supplied via a first choke coil and a first thyristor to a piezoelectric element for charging the piezoelectric element, the electric charge of which is subsequently discharged via a second thyristor and a second choke coil. The fuel injection control device includes a positive voltage detection unit for detecting an excess voltage arranged between the first choke coil and the first thyristor and a positive voltage control unit controlled by an output signal of the positive voltage detection unit and adapted for shorting both ends of the first choke coil. The current through the first thyristor is cutoff to prevent the excess voltage from being applied to the piezoelectric element.

REFERENCES:
patent: 4644212 (1987-02-01), Moritugu et al.
patent: 5013955 (1991-05-01), Hara et al.
patent: 5053668 (1991-10-01), Mitsuyasu
patent: 5057734 (1991-10-01), Tsuzuki et al.
patent: 5208505 (1993-05-01), Mitsuyasu
patent: 5214340 (1993-05-01), Suzuki
"Patent Abstracts of Japan", Group M751, vol. 12, No. 378, Oct. 11, 1988, abstract of JP-63-130356.

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