Injector drive circuit

Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...

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361153, 123490, H01H 4732

Patent

active

043608558

ABSTRACT:
An injector drive circuit in which the injector is opened in response to a pulse signal with a time width which determines the quantity of the fuel to be supplied to the engine. To the injector, a circuit for supplying a peak current at the time of fuel injection and a field effect transistor for supplying a holding current after supply of the peak current are connected in parallel. In response to the control signal from a fuel injection amount control circuit, the peak current is supplied to the injector, and upon detection that a predetermined peak current has been supplied to the injector, the peak current is stopped. Thereafter, by controlling the gate of the field effect transistor, the holding current is supplied to the injector through the field effect transistor, until the control signal is stopped.

REFERENCES:
patent: 4092717 (1978-05-01), Dinunzio
patent: 4134367 (1979-01-01), Ferry et al.
patent: 4158149 (1979-06-01), Otofuji
patent: 4173030 (1979-10-01), Rabe
patent: 4180026 (1979-11-01), Schulzke et al.
patent: 4225898 (1980-09-01), Weber et al.
patent: 4234903 (1980-11-01), Harper

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