Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1994-11-09
1996-03-12
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361172, H01H 4700
Patent
active
054991579
ABSTRACT:
An electronic fuel injection control system having a plurality of fuel injection valves, wherein each valve is operated by an electromagnetic solenoid. The control system includes at least one driver circuit for supplying current limited power to the solenoid, at least one control circuit for controlling the current passing through the solenoid, and a multiplexing means for selectively interconnecting the at least one driver circuit and the at least one control circuit to the terminals of a selected solenoid for selectively energizing the solenoid. The multiplexing means includes two switch arrays. The first switch array has at least one switch that selectively interconnects at least one driver circuit to a first terminal of the solenoids. The second switch array has at least one switch selectively interconnecting at least one control circuit to a second terminal of the solenoids. The multiplexing means is further characterized in that the two switch arrays are interconnected among the at least one driver circuit, the at least one control circuit, and the solenoids so that closure of any single switch from each switch bank uniquely selects and energizes a single solenoid.
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Beckman Dale A.
Younessi Ramin
Gaffin Jeffrey A.
Woodward Governor Company
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