Circuit for energizing a fuel injector valve coil

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

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361156, H01H 4732

Patent

active

041124774

ABSTRACT:
A circuit for energizing a fuel injector valve coil in response to a fuel injection pulse including a storage capacitor which is charged from a relatively high voltage source and which is discharged through the fuel injector valve coil through a controlled rectifier gated conductive upon the initiation of a fuel injection pulse signal. The charging circuit for the capacitor is disabled upon initiation of capacitor discharge for a time period at least greater than the time for the capacitor discharge current to decrease to a value to effect commutation of the controlled rectifier after which capacitor charging is reinitiated. A holding circuit is provided for holding the fuel injector valve coil energized for the duration of the fuel injection pulse signal.

REFERENCES:
patent: 3140428 (1964-07-01), Shepard, Jr.
patent: 3374402 (1968-03-01), Derc

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