Automatic transmission control system with variable lockup timin

Details Automatic transmission control system with variable lockup timin Automatic transmission control system with variable lockup timin

1995-06-01

1997-01-28

Chin, Gary

Boots, shoes, and leggings

36443104, 477 34, 477120, 477900, 395 22, 395 23, 395905, 395 11, 123361, 123480, G06F 1900, F16H 5948, G06E 100

Patent

active

055983367

ABSTRACT:
An automatic transmission control system for a transmission which is installed in a vehicle and whose torque converter is provided with a lockup mechanism; comprising a vehicle weight estimation device for estimating the weight of the vehicle; a gradient estimation device for estimating a gradient on which the vehicle is running; a standard lockup line selector for storing therein standard lockup lines which correspond respectively to the specified gear shift ratios of a speed change gear included in the transmission, and for selecting that one of the stored standard lockup lines which corresponds to the gear shift ratio in the present state of the vehicle; a lockup line corrector for correcting the selected standard lockup line in accordance with the estimated vehicle weight and the estimated gradient; and a lockup signal output device for deciding a timing of lockup "ON" or lockup "OFF" by the use of the corrected lockup line, and for delivering a lockup signal to the lockup mechanism (a lockup solenoid) at the decided timing. Since the lockup timing is varied in accordance with a running resistance, the drivability of the vehicle is enhanced.

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