Internal combustion engine having variable valve lift mechanism

Details Internal combustion engine having variable valve lift mechanism Internal combustion engine having variable valve lift mechanism

2011-01-11

2011-01-11

Cronin, Stephen K (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S179180

Reexamination Certificate

active

07869929

ABSTRACT:
Methods and systems for controlling an internal combustion engine are provided. The method may include opening and closing an intake valve respectively at first opening and closing timings of a cylinder cycle during an engine start when a temperature of the internal combustion engine is below a predetermined temperature, and opening and closing the intake valve respectively at second opening and closing timings of a cylinder cycle during an engine start when a temperature of the internal combustion engine is above the predetermined temperature. The second closing timing may be later than the first closing timing and after a bottom dead center of an intake stroke of the cylinder cycle. The second opening timing may be earlier than the first opening timing, and a difference between the first and second closing timings may be greater than a difference between the first and second opening timings.

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