Two-stroke-cycle engine with variable valve timing

Details Two-stroke-cycle engine with variable valve timing Two-stroke-cycle engine with variable valve timing

1991-10-08

1993-03-02

Okonsky, David A.

Internal-combustion engines

Two-cycle

Whirl through piston-controlled ports

123 65BA, F02B 2504

Patent

active

051899965

ABSTRACT:
A two-stroke-cycle spark ignited internal combustion engine operates with an exhaust valve that is controlled independently of crankshaft position and optimally for high power and low pollutant output in combination with a scavenging pump and fuel injector. The volume of combustible mixture is established at the point in the cycle when the exhaust valve is selectably closed with the piston traveling upwardly and decreasing the volume of the cylinder. Throttling losses are eliminated since the piston forces the scavenging air out of the cyclinder through the wide-open exhaust valve rather than the air being drawn into the cylinder against the reduced pressure caused by a conventional partially closed throttle plate. The volume of combustible air in the cylinder is determined by the point in the cycle at which the exhaust valve is closed and a correspondingly appropriate charge of fuel is thereafter injected into the cylinder.

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patent: 4993372 (1991-02-01), Mott et al.
patent: 4995350 (1991-02-01), Kumagai et al.
patent: 5000133 (1991-03-01), Kawamura

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