Ignition timing control for engine
US4133324A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1977 |
| Grant date | Jan 9, 1979 |
| Priority date | — |
| Expiry date | Jun 29, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P5/106
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Spark timing control apparatus for an internal combustion engine having a throttle controlled intake passage for an air-fuel mixture. A vehicle is powered by the engine. A vacuum line from the intake passage downstream from the throttle valve is connected to a three-way valve which, in turn, has one conduit connected to a spark advance chamber and another conduit connected to a spark retard chamber. Another valve closes the vacuum line when the engine temperature is low. An electrical switch sensitive to velocity of the vehicle actuates the three-way valve electromagnetically to connect the vacuum line to either of said chambers for actuating a movable member which controls the ignition timing of the engine. The conduit leading to the spark retard chamber also leads to a vacuum chamber in an additional fuel supply system having a valve, so that when the spark is retarded the additional fuel supply is cut off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.