Lock-up type automatic transmission

Details Lock-up type automatic transmission Lock-up type automatic transmission

1981-03-10

1984-02-14

Bonck, Rodney H.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 329, 192 358, F16D 4706, B60K 4122

Patent

active

044310951

ABSTRACT:
A lock-up type automatic transmission having a lock-up clutch between the pump impeller and the turbine runner of the torque converter. Control means for engaging and disengaging the lock-up clutch includes a lock-up control valve, a solenoid valve to control the shifting of the lock-up control valve, lock-up decision circuit means for producing a lock-up permission signal, shifting operation detector circuit means for producing a shift pulse signal, and a solenoid valve control means for controlling the solenoid valve to effect engagement of the lock-up clutch under conditions when the lock-up permission signal is present and the shift signal is not present, but to effect temporal disengagement of the lock-up clutch in response to the presence of the shift signal even when the lock-up permission signal is present. A delay means is provided to retard the appearance of the shift signal from the appearance of a demand for the shifting from one gear ratio to another gear ratio.

REFERENCES:
patent: 2856794 (1958-10-01), Simpson
patent: 3073179 (1963-01-01), Christenson
patent: 3693478 (1972-09-01), Malloy
patent: 3710652 (1973-01-01), Miyazaki
patent: 3752282 (1973-08-01), Espenshied
patent: 3857302 (1974-12-01), Morris
patent: 3985046 (1976-10-01), Morris et al.
patent: 4095486 (1978-06-01), Ohnuma

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