Ignition timing control device for an internal combustion engine
US4077373A · kind A · utility
4Cited by
11References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1974 |
| Grant date | Mar 7, 1978 |
| Priority date | — |
| Expiry date | Dec 10, 1994 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P5/103
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A spark-advance mechanism for an internal combustion engine is operated by vacuum pressure in the engine intake manifold. A conduit connecting the spark-advance mechanism to the intake manifold includes a solenoid operated valve which is normally open, and which is closed by either of two switches connected in parallel. One of the switches is closed when the engine temperature is low, and the other is closed when the engine RPM is high. When the solenoid valve is energized by either or both switches to close the conduit, atmospheric air is bled through an orifice to cause slow advance of the spark timing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.