Engine speed limiting control circuit

Details Engine speed limiting control circuit Engine speed limiting control circuit

G - Physics

05

D

341/94

G05D 13/62 (2006.01) B60K 31/10 (2006.01) F02D 17/04 (2006.01) F02D 31/00 (2006.01) G01P 1/10 (2006.01)

Patent

CA 1048623

ENGINE SPEED LIMITING CONTROL CIRCUIT Abstract of the Disclosure A system for limiting the speed of a gasoline engine includes a circuit responsive to the engine speed which provides control signals to a solenoid valve which in turn controls a vacuum actuator. The vacuum actuator then overrides a manual throttle control to move the throttle towards closed position when a governed engine speed is approached. The control circuit provides a signal having three components: one proportional to engine speed, a second proportional to engine acceleration and a third which is the integrated difference between the engine speed and a preset governed speed. In addition, the third signal is high at low engine speed and gradually diminishes as engine speed increases to intermediate or high values. The control signal controls a duty cycle oscillator which actuates the solenoid valve. The duty cycle oscillator is inhibited at low speeds to prevent interference with manual throttle control.

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