Engine valve performance controller

Details Engine valve performance controller Engine valve performance controller

2006-12-26

2006-12-26

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090170, C123S406290

Reexamination Certificate

active

07152560

ABSTRACT:
A valve performance controller for use in an engine that performs ignition timing retardation control to prevent knocking. The controller variably controls valve performance of an intake valve in accordance with an operation state of the engine. The controller corrects a control target so that the compression end temperature of a combustion chamber decreases when a retardation amount of the ignition timing obtained through the retardation control is greater than a predetermined value. The correction is performed only when the engine performance degradation that would occur when the ignition timing is retarded in a state in which the control target is uncorrected is predicted to be greater than the engine performance degradation that would occur when the control target is corrected.

REFERENCES:
patent: 5235952 (1993-08-01), Takasuka et al.
patent: 6425357 (2002-07-01), Shimizu et al.
patent: 2001-263015 (2001-09-01), None

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