Internal-combustion engines – Four-cycle – Scavenging
Patent
1991-05-09
1992-07-21
Okonsky, David A.
Internal-combustion engines
Four-cycle
Scavenging
123 65VC, 123 73C, F02B 7502, F02B 3304, F02B 2500
Patent
active
051313545
ABSTRACT:
Method for operating an engine having a piston reciprocable in a cylinder, an intake port for admitting air, an exhaust valve controlled by a valve actuator independently of crankshaft position, spark ignition, and fuel injection. During a first stroke the piston moves from BDC to TDC, the intake port is closed, the exhaust valve is closed, and fuel is injected. During a second stroke (TDC to BDC) the exhaust valve remains closed, lowering the pressure and causing some evaporation of the fuel-air mixture. During a third stroke (BDC to TDC), the fuel air mixture is again increased and finally ignited. During a fourth stroke (TDC to BDC) the ignited mixture expands, followed by opening the exhaust valve and the intake port. The second and third strokes enhance evaporation thus permit ignition of low vapor pressure fuel in a cold engine. Once the engine is hot, the valve actuators permit transition to a two-stroke-cycle.
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Moulis Thomas N.
North American Philips Corporation
Okonsky David A.
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