Internal combustion engine control apparatus

Details Internal combustion engine control apparatus Internal combustion engine control apparatus

2008-03-18

2008-03-18

Solis, Erick (Department: 3747)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090150, C123S339240

Reexamination Certificate

active

11684768

ABSTRACT:
An internal combustion engine control apparatus is provided with a hydraulically operated variable valve operating mechanism for varying the valve timing of air intake valves, and a water temperature sensor for sensing engine coolant temperature to estimate the degree of engine warm-up. The valve operating mechanism is controlled to switch the valve timing from the warm-up idle valve timing with a high idling speed to the post-warm-up idle valve timing with a slower idling speed as the engine temperature approaches the warm-up temperature threshold. The switch in valve timings starts before an engine rotational speed falls below a rotational speed threshold lying between the high idling speed during the warm-up idling and the post-warm-up idling speed during the post-warm-up idling such that a sufficient hydraulic pressure switch the valve timing with a specific degree of responsiveness is attained when the engine rotational speed is at or above the rotational speed threshold.

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