Lock-up clutch control apparatus

Details Lock-up clutch control apparatus Lock-up clutch control apparatus

1998-09-25

1999-11-02

Lorence, Richard M.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 358, 477 63, 477 65, F16H 4502

Patent

active

059752629

ABSTRACT:
In order to improve the fuel consumption by maintaining the lock-up clutch as tightly as possible during the down-shift operation, a lock-up clutch control apparatus is provided. The lock-up clutch control apparatus comprises a revolution control device for predicting the number of revolutions of the an input axis of transmission and the number of revolutions of an engine after the speed change before a down-shift operation; a torque converter judgement device for judging the state of the torque converter in terms of whether or not a torque ratio of the torque converter will be in the torque amplification range when the lock-up clutch is turned off, from the number of revolution of the input axis of the transmission and the engine speed obtained by the revolution prediction device; and a control device for turning off the lock-up clutch, if the lock-up clutch before the speed change is in a tight condition, in the case when the judgement device judges that the torque converter will be in the torque amplification range when the lock-up clutch is turned off.

REFERENCES:
patent: 4431095 (1984-02-01), Suga
patent: 4582182 (1986-04-01), Takeda et al.

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