Internal-combustion engines – Starting device – With fuel or intake air control
Patent
1997-05-08
1999-05-18
Dolinar, Andrew M.
Internal-combustion engines
Starting device
With fuel or intake air control
1231821, F01L13/08
Patent
active
059041242
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 through the carburetor. The thermally-responsive member may be made from a thermal actuating polymer, commercial wax, bimetallic material, or from a nickel-titanium alloy which contracts at a predetermined engine temperature.
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Gracyalny Gary J.
Mitchell Robert K.
Poehlman Arthur G.
Briggs & Stratton Corporation
Dolinar Andrew M.
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