High resolution electronic ignition control system
US4494509A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1982 |
| Grant date | Jan 22, 1985 |
| Priority date | — |
| Expiry date | Oct 22, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An electronic ignition system is disclosed for controlling as a function of a selected engine parameter the ignition instant of an internal combustion engine having at least one cylinder and a piston disposed therein and coupled to a rotatable crankshaft of the engine to define a first reference position with respect to the crankshaft. The ignition instant occurs upon the termination of an arc of crankshaft rotation at a second variable position with respect to the first reference position. The arc of crankshaft rotation is initiated at a third reference position fixedly disposed before said first reference position considering the rotational direction of the crankshaft. More specifically, the electronic ignition system comprises a first sensor responsive to crankshaft rotation for providing a first train of signals of a first frequency, each first signal occurring in time when the crankshaft rotates past its third reference position, and a second sensor responsive to crankshaft rotation for providing a second train of signals of a second frequency greater than the first frequency and proportional to the speed of angular rotation of the crankshaft. A counter is coupled to receive t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.