Control of ignition timing upon occurrence of abnormality in a reference crank angle position sensing system
US4690123A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1986 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | May 21, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of controlling ignition timing of an internal combustion engine when an abnormality develops in a system for sensing a reference crank angle position of a crankshaft of the engine, in which the timing at which an ignition coil starts and stops conducting is controlled on the basis of a first pulse signal generated once per at least two revolutions of the crankshaft at a predetermined crank angle position associated with a particular cylinder of the engine, a second pulse signal indicative of a predetermined reference crank angle position of the crankshaft for each cylinder, and a third pulse signal indicative of a predetermined angular position of the crankshaft. The method comprises the steps of sensing an abnormality in the reference crank angle position sensing system for sensing the predetermined reference crank angle position, generating a pseudo-signal pulse having a predetermined pulse width in place of the second pulse signal on the basis of the first and third pulse signals when the second pulse signal fails to be generated because of the abnormality in the reference crank angle position sensing system, starting conduction of the ignition coil at a leading edge of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.