System and method for improved fuel economy during vehicle...

Details System and method for improved fuel economy during vehicle... System and method for improved fuel economy during vehicle...

2005-07-27

2008-09-16

Marmmor, Charles A. (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Engine controlled by transmission

Reexamination Certificate

active

07425187

ABSTRACT:
A method of operating an engine of a vehicle having a powertrain having a transmission is described. The method includes, during a driver tip-out condition where the vehicle is decelerating, adjusting engine output based on a gear of the transmission, and reducing airflow to reduce engine torque output without reducing torque by retarding spark timing, following the driver tip-out, until airflow reaches a minimum value below which combustion may be degraded; and upon airflow reach said minimum value, retarding spark timing to further reduce engine output.

REFERENCES:
patent: 6178371 (2001-01-01), Light et al.
patent: 6560523 (2003-05-01), Kotwicki et al.
patent: 6701246 (2004-03-01), Riedle et al.

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