Control system for automatic transmission for vehicle

Details Control system for automatic transmission for vehicle Control system for automatic transmission for vehicle

1996-01-31

1997-09-23

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Including fluid drive

477 80, 477904, 192 33, 192 358, F16H 6158

Patent

active

056698488

ABSTRACT:
In order to prevent an increase in engine noise during a kick-down, a timer is set concurrently with a downshifting. When the throttle opening degree becomes equal to or larger than a threshold value YTHNST by a rapid depression of an accelerator pedal before lapse of a predetermined time, a lock-up clutch of a torque converter is brought into an engaged state, thereby preventing a revolution speed of an engine from rising rapidly in order to alleviate the engine noise. After the throttle opening degree TH becomes smaller than the threshold value YTHNST and the engagement of the lock-up clutch is released, the lock-up clutch is not brought into the engaged state even if the throttle opening degree TH again becomes equal to or larger than the threshold value YTHNST. Also, when the throttle opening degree TH becomes equal to or larger than the threshold value YTHNST after lapse of the predetermined time, the lock-up clutch is not brought into the engaged state.

REFERENCES:
patent: 4294140 (1981-10-01), Iwanaga et al.
patent: 4438665 (1984-03-01), Schmidt
patent: 4512212 (1985-04-01), Ishikawa
patent: 5035308 (1991-07-01), Baba et al.
patent: 5086889 (1992-02-01), Nobumoto et al.
patent: 5133232 (1992-07-01), Kikuchi et al.

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