Multi-poppet valve type two cycle engine

Details Multi-poppet valve type two cycle engine Multi-poppet valve type two cycle engine

1990-11-27

1992-07-28

Nelli, Raymond A.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123 52M, F02B 7502

Patent

active

051333090

ABSTRACT:
In an engine wherein there is only one exhaust valve per cylinder, the single exhaust valve is maintained closed while an inlet valve, via which an air-fuel mixture is exclusively admitted to the combustion chamber, is open. A second inlet valve, via which only air is supplied into the combustion chamber, is arranged to open when the exhaust valve is opened. In this manner, fuel is prevented from passing through the combustion chamber to the exhaust system. While the second inlet valve is open, air which contains no fuel is used to scavenge the combustion gases. In engines wherein there are two exhaust valves per cylinder, it is possible for a stoichiometric air-fuel mixture to be formed in the combustion chamber. In this configuration one of the two exhaust valves is opened during an initial stage of the exhaust phase, and the combustion gases are exhausted into a three-way catalytic converter. The first exhaust valve can then be closed and the other exhaust valve opened for essentially the same time period that the inlet valve, via which only air is supplied is open. A mixture of combustion gases and scavenging air can accordingly be exhausted into an oxidizing type converter.

REFERENCES:
patent: 2474879 (1949-07-01), Winfield
patent: 2476477 (1949-07-01), Lucke
patent: 4834048 (1989-05-01), Adamis et al.
patent: 4995354 (1991-02-01), Morikawa

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