Vacuum retard delay valve
US3995607A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1975 |
| Grant date | Dec 7, 1976 |
| Priority date | — |
| Expiry date | Apr 14, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7847
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An internal combustion engine for automotive vehicles is started and operated with decreased fuel enrichment when the engine is cold by delaying spark retard as the vehicle is accelerated to save fuel and reduce accumulated pollutants collected during warm up. A valve is provided between the carburetor spark port and the distributor vacuum advance cylinder to permit unrestricted airflow from the vacuum advance cylinder to the spark port at all temperatures and to restrict airflow from the spark port to the vacuum advance cylinder when the engine operating temperature is below a predetermined temperature. When the engine operating temperature attains the predetermined temperature airflow is unrestricted in both directions and the vacuum advance operates in a normal manner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.