Compression ratio control for internal combustion engine

Details Compression ratio control for internal combustion engine Compression ratio control for internal combustion engine

1994-01-24

1995-09-19

Macy, Marguerite

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

F02D 1500

Patent

active

054508240

ABSTRACT:
An internal combustion engine has an intake valve and an exhaust valve. When the engine operates at low speed with low and medium load, the intake valve is operated to close at a relatively advanced timing for increased volumetric effeciency and increased real compression ratio. When the engine operates at low speeds with high load, the exhaust valve is operated to close at a relatively retarded timing with the intake valve being operated to close at the relatively advanced timing, whereby the volumetric efficiency is subject to a drop to prevent occurrence of knocking.

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F001637, "Nissan Infinity Q45" (Oct. 1989), pp. B-41 and B-42.

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