Electronically controlled clutch engagement speed correcting for

Details Electronically controlled clutch engagement speed correcting for Electronically controlled clutch engagement speed correcting for

1990-03-26

1992-05-05

Herrmann, Allan D.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 0032, 74862, F16D 2300

Patent

active

051099675

ABSTRACT:
An electronically controlled automatic transmission system including an automatic transmission having a plurality of clutches and brakes activated by application of a fluid pressure to change the gear ratio by engagement and disengagement of the clutches and brakes, a fluid pressure switching device for controlling the application of the fluid pressure to the clutches and brakes, and an electronic controller for changing the engagement and disengagement of the clutches and brakes by driving the fluid pressure switching device in accordance with the running condition of the vehicle, the electronic controller also controlling the speed of engagement of a clutch or brake which is to be engaged. The electronic controller includes a torque sensor for detecting the torque of the output shaft of the automatic transmission, and an engagement speed correcting device for correcting the speed of engagement of a clutch or brake which is to be engaged on the basis of the detected torque. If the condition of double engagement is judged to be improper in the process of gear-shifting, the speed of engagement of the clutch or brake to be engaged is automatically corrected so that the condition of double engagement is shifted to an optimal one by feedback control. Thus, the shock applied to the vehicle during a gear-shifting operation is reduced.

REFERENCES:
patent: 4283970 (1981-08-01), Vukovich
patent: 4507985 (1985-03-01), Morimoto
patent: 4715482 (1987-12-01), Watanabe et al.
patent: 4723644 (1988-02-01), Sakakiyama
patent: 4795011 (1989-01-01), Ushijima et al.
patent: 4880094 (1989-11-01), Ohkumo
patent: 4905801 (1990-03-01), Tezuka

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