Engine speed limiting control circuit
US3998191A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1975 |
| Grant date | Dec 21, 1976 |
| Priority date | — |
| Expiry date | Mar 27, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P1/103
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.