Lock-up control system for an automatic transmission

Details Lock-up control system for an automatic transmission Lock-up control system for an automatic transmission

1985-05-03

1987-02-03

Bonck, Rodney H.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 0092, 192 331, 192 358, F16H 4502, B60K 4128

Patent

active

046403949

ABSTRACT:
A lock-up control system for an automatic transmission including a torque converter coupled with an engine, a power transmitting gear arrangement controlled by a gear ratio control device in accordance with a shifting up or down signal, and a lock-up clutch provided for locking up the output shaft of the torque converter to the output shaft of the engine. The lock-up control system comprises lock-up operation control apparatus causing the lock-up clutch to be in its inoperative state when the gear ratio control device performs the control with the shifting up or down signal, and lock-up command device for preventing the lock-up operation control apparatus from causing the lock-up clutch to be in its inoperative state until a predetermined reductive variation in the speed of the output shaft of the torque converter arises after the shifting up signal is supplied to the gear ratio control device under the condition in which the lock-up clutch is in operation.

REFERENCES:
patent: 4270636 (1981-06-01), Sunohara et al.
patent: 4298105 (1981-11-01), Duhaime
patent: 4373619 (1983-02-01), Schritt et al.
patent: 4386687 (1983-06-01), Chevalier et al.
patent: 4431095 (1984-02-01), Suga
patent: 4448293 (1984-05-01), Maeda
patent: 4457410 (1984-07-01), Suga et al.
patent: 4463842 (1984-08-01), Redzinski
patent: 4531433 (1985-07-01), Suga
patent: 4582182 (1986-04-01), Takeda et al.

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