Automatic transmission downshifts based on tire adhesion limits

Details Automatic transmission downshifts based on tire adhesion limits Automatic transmission downshifts based on tire adhesion limits

2006-04-18

2006-04-18

Lewis, Tisha (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Control by sensed ambient condition, pattern indicia,...

C701S065000

Reexamination Certificate

active

07029419

ABSTRACT:
A shift control system that controls gear shifts in a vehicle includes a transmission and a controller. The controller detects driving conditions of the vehicle, estimates a traction load of the vehicle and determines a current traction load of the vehicle. The controller shifts the transmission based on the current traction load and the estimated traction load if the driving conditions are met. The current traction load is based on a lateral acceleration signal and a longitudinal acceleration signal. The estimated traction load is based on a curb weight of the vehicle, a weight transfer gain and an acceleration signal.

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