Engine idle speed control device

Details Engine idle speed control device Engine idle speed control device

2006-11-28

2006-11-28

Estremsky, Sherry (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Engine ignition control for transmission change

C477S116000

Reexamination Certificate

active

07141000

ABSTRACT:
An engine idle speed control device set a target idle speed NsetN for a non-traveling range is set to a high value to activate the catalytic converter early, after the engine is started. Upon detecting that the automatic transmission has been shifted from a non-traveling range to a traveling range, the target idle speed is lowered to a first traveling idle speed Nset1for a prescribed period (200 ms). After the prescribed period elapses, the target idle speed is lowered even further to a second traveling target idle speed Nset2. When the target idle speed is set to the first traveling target idle speed Nset1, the ignition timing retardation amount RET is set in accordance with the actual engine rotational speed Ne in such a fashion that the higher the engine rotational speed Ne is, the more the ignition timing ADV is retarded.

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