Slip control system for torque converter

Interrelated power delivery controls – including engine control – Clutch control – Condition responsive control

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477169, 477175, F16H 6114

Patent

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06039675&

ABSTRACT:
A slip control system for a torque converter with a lockup clutch comprises a controller from which a slip control signal is outputted to a slip control actuator of the torque converter. The controller is arranged to calculate a reference value of a lockup clutch engagement pressure on the basis of a characteristic of the torque converter, to calculate a difference canceling lockup clutch engagement pressure for adjusting an actual slip rotation speed to the target slip rotation speed, to obtain the sum of the lockup clutch engagement pressure reference value and the difference canceling lockup clutch engagement pressure as a lockup clutch engagement pressure command value, and to output the control signal indicative of the lockup clutch engagement pressure command value to the actuator.

REFERENCES:
patent: 5616099 (1997-04-01), Sakai
patent: 5626536 (1997-05-01), Lpmp et al.
patent: 5637052 (1997-06-01), Hirota et al.
patent: 5683329 (1997-11-01), Kono et al.
patent: 5697479 (1997-12-01), Kono et al.
patent: 5724866 (1998-03-01), Minowa et al.
patent: 5733223 (1998-03-01), Matsubara et al.
patent: 5803868 (1998-09-01), Kono et al.
K. Kono, et al., Scientific Lecture Meeting (Reprint No. 954), "Lock-up Clutch Slip Control System for Automatic Transmissions", pp. 81-84, Toyoto Motor Corporation, (Sep. 1995).

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