Variable cycle engine

Details Variable cycle engine Variable cycle engine

1992-12-10

1993-08-10

Wolfe, Willis R.

Internal-combustion engines

Six-cycle

123 9015, 123 9016, 123 9017, 123432, F01L 902

Patent

active

052339483

ABSTRACT:
A method of phaseshifting a variable cycle engine utilizing the Otto cycle engine timing schedule for full-load and the Atkinson cycle engine timing schedule for part-load operation, the engine having multiple intake valves and an exhaust valve, phaseshifting of the intake and exhaust events coupled with adjustment of the clearance volume and the use of residual gas in the cylinder as a determinant of the intake charge volume and the compression end temperature level, to provide a high engine operating efficiency while concurrently lowering nitrogen oxide emissions and eliminating the need for an external exhaust gas recirculating system.

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SAE Technical Paper Series 890677, Saunders et al, "Variable Value Closure Timing for Load Control and the Otto Atkinson Cycle Engine", Feb. 27-Mar. 3, 1989.

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