Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1997-05-08
1999-09-21
Yuen, Henry C.
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9021, 123 9026, 123198F, F01L 100
Patent
active
059540184
ABSTRACT:
A cylinder of a mode selective internal combustion engine is operable in two modes, including one active mode with conventional operations of cylinder valves and another passive mode with continuously closed or open engine valves. By creating ideal combustion conditions in all active cylinder cycles throughout a range of loads, the engine has improved brake thermal efficiency and produces less effluents. A mode camshaft turned at or close to an integer fractional speed of the primary camshaft synchronizes change of mode of each cylinder valve within its inactive phase in the working cycle, and further provides for change of mode of suction and exhaust valves in the same cycle.
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Huynh Hai
Yuen Henry C.
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