Enrichment apparatus for internal combustion engines
US5904124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1997 |
| Grant date | May 18, 1999 |
| Priority date | — |
| Expiry date | May 8, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L13/08
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The automatic enrichment mechanism for an internal combustion engine is thermally-responsive and may also be centrifugally-responsive. The invention increases engine startability and minimizes stumbling and stalling of the engine during engine warmup. The thermally-responsive mechanism allows an additional reverse gas flow through the intake manifold to thereby increase the fuel discharged by the carburetor fuel nozzle. In several embodiments, the thermally-responsive mechanism, at low engine temperatures, causes a blocking or retaining member to keep an auxiliary cam member engaged with the cam follower of the valve assembly. As a result, the intake valve is partially unseated at low engine temperatures and a portion of the air/fuel mixture is fed back to the intake manifold. In these embodiments, when the engine temperature reaches a predetermined level, the thermally-responsive mechanism allows the auxiliary cam member to disengage from the cam follower in response to centrifugal force on the flyweights. In other embodiments, the thermally-responsive device allows crankcase gases to be fed to the intake manifold downstream of the fuel nozzle, causing a reverse flow of gas throug…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.