Ignition timing correcting system for internal combustion engine
US4373487A · kind A · utility
Inventors
Key dates
| Filing date | Mar 31, 1981 |
| Grant date | Feb 15, 1983 |
| Priority date | — |
| Expiry date | Mar 31, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An ignition timing correcting system generate a reference signal at a reference angular position of a rotating internal combustion engine and an ignition signal leading it by a constant phase. A phase shifter normally responds to a control signal from a movable tap on a potentiometer, to retard the ignition signal to form a retarded ignition signal. The phase comparison of the two signals produces an advance or a retardation correcting signal formed of a pulse train having a pulse-width corresponding to a phase difference between the two ignition signals. During the idling of the engine, the correcting signal drives forwardly or reversely an electric reversible motor to move the tap on the potentiometer to adjust the control signal. During the warm-up of the engine, the phase shifter is supplied with the sum of the control signal and a signal with a predetermined voltage to further retard the ignition signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.