Engine speed limiting control circuit

Details Engine speed limiting control circuit Engine speed limiting control circuit

1977-10-03

1979-01-16

Lucas, Jay P.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

180105E, 361239, F02D 1110

Patent

active

041343735

ABSTRACT:
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 toward closed position when a governed engine speed is approached. A control circuit provides a signal having four components; one proportional to engine speed, second and third proportional to engine acceleration and a fourth which is the integrated difference between the engine speed and a preset governed speed. In addition a speed switch actuated when an overspeed condition occurs is effective to inhibit the third component and to increase the fourth component to its maximum value to effect maximum governing action and system stability. The control signal controls a duty cycle oscillator which actuates the solenoid valve.

REFERENCES:
patent: 3340883 (1967-09-01), Peternel
patent: 3568059 (1971-03-01), Sordello
patent: 3581720 (1971-06-01), Hemphill
patent: 3695242 (1972-10-01), Tada et al.
patent: 3715006 (1973-02-01), Walsh
patent: 3868548 (1975-02-01), Grundy
patent: 3998191 (1976-12-01), Beyerlein
patent: 4071109 (1978-01-01), Ezoe

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