Control of vehicle automatic transmission

Details Control of vehicle automatic transmission Control of vehicle automatic transmission

1988-03-01

1990-07-17

Gruber, Felix D.

Boots, shoes, and leggings

74866, 74867, B60K 4118, B60K 4116, G05D 1702

Patent

active

049425307

ABSTRACT:
An automatic transmission including a torque converter and a multiple stage transmission gear mechanism. A hydraulically actuated brake and a hydraulically actuated clutch is provided for alternate engagement to select alternately one of two adjacent gear stages. In order to prevent gear shift shock, the engaging of the clutch or the brake is controlled so that the engaging rate is faster for a predetermined time period in an initial period of a gear shifting operation than in a remainder period. A control circuit is provided to monitor the gear shifting operation and modifying the predetermined time period in accordance with the results of the latest gear shifting operation and store the modified value for the use in a next gear shifting operation.

REFERENCES:
patent: 3754482 (1973-08-01), Sanders et al.
patent: 4283970 (1981-08-01), Vukovich
patent: 4633739 (1987-01-01), Ogasawara et al.
patent: 4667540 (1987-05-01), Yagi
patent: 4707789 (1987-11-01), Downs et al.
patent: 4709596 (1987-12-01), Boda et al.
patent: 4730519 (1988-03-01), Nakamura et al.
patent: 4744031 (1988-05-01), Takeda et al.
patent: 4754403 (1988-06-01), Hiramatsu
patent: 4779491 (1988-10-01), Fujiwara et al.

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