Nonlinear vacuum spark advance system
US3935843A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 2, 1973 |
| Grant date | Feb 3, 1976 |
| Priority date | — |
| Expiry date | Feb 2, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2693
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A vacuum control assembly for regulating the vacuum servo mechanism of an internal combustion engine's distributor including a vacuum sensitive device located between the carburetor spark and EGR vacuum ports and the distributor breaker plate servo mechanism, the device containing two parallel flow circuits connected to the servo, one being connected to the spark port and containing a servo operated cut-off valve, the other being connected to the EGR port and containing a servo operated switching valve that connects the distributor servo mechanism to the EGR port once the engine has reached a predetermined speed. The vacuum sensitive device provides immediate spark advance as the engine begins to accelerate by being in communication with the carburetor spark port until an operative vacuum level is reached; after the engine has accelerated to a predetermined speed the device is operative to change the spark advance signal to the continuously increasing EGR vacuum signal; a check valve is included between the servo mechanism and carburetor spark port so that during heavy accelerations the spark advance setting is quickly lowered to avoid engine detonation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.