Apparatus and method for controlling lock-up clutch

Details Apparatus and method for controlling lock-up clutch Apparatus and method for controlling lock-up clutch

1995-02-17

1996-11-12

Lorence, Richard M.

Interrelated power delivery controls, including engine control

Transmission control

Including fluid drive

477 65, 192 33, 192 358, 747331, F16H 6114

Patent

active

055734731

ABSTRACT:
A lock-up clutch by way of which input/output shafts of a torque converter are operatively connected to each other is connected to an electronic type pressure control valve. During speed changing in a transmission, the problem of interruption of torque transmission can be solved by turning off the lock-up clutch at the time when filling of one of the speed changing clutches to be next brought into an operatively engaged state with hydraulic oil is completed. Hydraulic pressure (P.sub.t) in the torque converter is exerted on the back 100 pressure portion of a piston of the lock-up clutch while hydraulic pressure (P.sub.t) in the torque converter is exerted on the proportional solenoid side of the pressure control valve, making it possible to reduce the initial hydraulic pressure. During speed changing, the lock-up clutch is not fully released from the engaged state but maintains its operative state at low pressure, causing shock from shifting the lock-up state to be reduced. When hydraulic pressure is gradually increased, the extent of opening the throttle, weight of the vehicle and the current gear ratio are derived so as to vary the rate of gradual increase of hydraulic pressure depending 100 on values of these parameters.

REFERENCES:
patent: 4671139 (1987-06-01), Downs et al.
patent: 5035312 (1991-07-01), Asayama et al.
patent: 5417622 (1995-05-01), Asayama et al.

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