Control circuit

Details Control circuit Control circuit

1975-01-27

1976-03-30

Envall, Jr., R. N.

317131, H03H 900

Patent

active

039477339

ABSTRACT:
A temperature-actuated circuit for controlling the application of an electronic circuit. In a typical application, the control circuit shunts a circuit which effects enrichment of the fuel mixture for the cold-starting of internal combustion engines. In a preferred embodiment, the control circuit comprises a temperature-dependent resistance, such as a thermistor, which supplies changing voltage with increasing engine temperature to the gate of an SCR. After an interval necessary to attain a predetermined engine temperature, the altered gate voltage triggers the SCR, thereby actuating a relay associated with the enrichment circuit for shunting the enrichment circuit from the fuel injection circuit. Typically, the enrichment circuit alters the width of square wave signals which control fuel delivery, so that bypassing the circuit eliminates the altered wave characteristics and provides leaner, more economical operation.
The control circuit components may be selected to provide time delay operation, rather than operation controlled by an external temperature. Also, the control circuit can include features such as manual override and visual and/or audible operation displays.

REFERENCES:
patent: 3258655 (1966-06-01), Pinckuers
patent: 3417305 (1968-12-01), Russell

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