Direct-coupling clutch control method for an automatic transmiss

Details Direct-coupling clutch control method for an automatic transmiss Direct-coupling clutch control method for an automatic transmiss

1992-05-21

1994-01-11

Braun, Leslie A.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 0076, B60K 4116

Patent

active

052772870

ABSTRACT:
A direct-coupling control method capable of improving fuel efficiency by performing slip direct-coupling control of a torque converter, in which a driving force transmission of an automatic transmission is operated under an approximate direct-coupling condition that permits slight slippage of the torque converter, in a predetermined operating range of the automatic transmission such as a low speed range thereof, and capable of positively detecting and preventing direct-coupling vibration caused by deterioration of hydraulic oil or the like. In the slip direct-coupling control, an occurrence of direct-coupling vibration is detected when a variation of a slip amount changing beyond predetermined upper and lower limit values is found a predetermined number of times during a predetermined period of time, or when a variation in the rotational rate of the output shaft of the torque converter still continues even after the slip direct-coupling control is interrupted for the reason that the rotational rate has varied beyond a permissible range. Upon detection of the direct-coupling vibration, the slip direct-coupling control is inhibited.

REFERENCES:
patent: 4428467 (1984-01-01), Hiramatsu
patent: 4582185 (1986-04-01), Grimes et al.
patent: 4660697 (1987-04-01), Yoneda et al.
patent: 4706790 (1987-11-01), Lockhart et al.
patent: 4724939 (1988-02-01), Lockhart et al.
patent: 4940122 (1990-07-01), Fujieda
patent: 5085301 (1992-02-01), Inamura et al.

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