Engine idle speed control device

Details Engine idle speed control device Engine idle speed control device

2007-01-30

2007-01-30

Wright, Dirk (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Engine ignition control for transmission change

Reexamination Certificate

active

11066257

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 Nset1. A feedback gain G used for feedback control of the ignition timing is then set to a larger gain value. The larger gain value is set such that it varies based on the temperature of the automatic transmission fluid or other parameter indicative of the engine friction and/or automatic transmission friction. As a result, the ignition timing is retarded in a precise manner, the engine speed is reduced, and the clutch engagement shock is reduced.

REFERENCES:
patent: 5199326 (1993-04-01), Iwatsuki et al.
patent: 2002/0124554 (2002-09-01), Majima
patent: 2005/0187069 (2005-08-01), Mori et al.
patent: 1 231 397 (2002-08-01), None
patent: 1 260 691 (2002-11-01), None
patent: 1 348 895 (2003-10-01), None
patent: 5-280398 (1993-10-01), None

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