System for driving solenoid valve for internal combustion engine

Details System for driving solenoid valve for internal combustion engine System for driving solenoid valve for internal combustion engine

1986-04-01

1987-04-14

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

361154, F02M 5100

Patent

active

046569898

ABSTRACT:
The present invention is directed to a system for driving a solenoid valve for an internal combustion engine in which the period of a solenoid valve holding pulse signal is preset, and even if an output time of an injector ON control signal changes in response to some particular engine operating conditions, the end of the output time of the injector ON control signal and that of a solenoid valve holding pulse signal are rendered completely coincident with each other. Therefore, the solenoid valve can be controlled accurately at a predetermined injector ON time, thus permitting an appropriate fuel injection. A solenoid valve holding time which is shorter than a difference obtained by subtracting the shortest time Tomin required for lifting a solenoid valve from a predetermined output time Ti of the injector ON control signal and which is an integer (N) multiple of a period T of a solenoid valve holding pulse, and an actual solenoid valve lifting time Tone is obtained from the difference between the Ti and the solenoid valve holding time.

REFERENCES:
patent: 3579052 (1971-05-01), Kato
patent: 4134367 (1979-01-01), Ferry et al.
patent: 4234903 (1980-11-01), Harper
patent: 4452210 (1984-06-01), Sasayama et al.
patent: 4511945 (1985-04-01), Nielsen
patent: 4604675 (1986-08-01), Pflederer
patent: 4605983 (1986-08-01), Harvey
patent: 4607311 (1986-08-01), Brown et al.

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