Lock-up clutch control system for automatic power transmission

Details Lock-up clutch control system for automatic power transmission Lock-up clutch control system for automatic power transmission

1990-09-06

1992-02-11

Braun, Leslie A.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 331, 192 333, 192 0032, F16D 3300

Patent

active

050868942

ABSTRACT:
A lock-up clutch control system for an automatic power transmission includes a torque converter mode, a full lock-up mode and a clip lock-up mode for controlling operation of a lock-up clutch which is disposed between a pump impeller and a turbine runner of a torque converter. The slip lock-up mode is a transitional mode between the torque converter mode and the full lock-up mode and connects the pump impeller and the turbine runner such that a relative rotation therebetween is allowed. In the system, one of the above-noted three modes is selected based on preselected vehicular operating condition indicative parameters, such as, an engine load and a vehicle speed. When a rapid depression of an accelerator pedal by a driver is detected after the slip lock-up mode is selected, the torque converter mode is executed in place of the slip lock-up mode until the rapid depression of the accelerator pedal is not detected.

REFERENCES:
patent: 4490122 (1990-07-01), Fujieda
patent: 4577737 (1986-03-01), Niikura et al.
patent: 4582185 (1986-04-01), Grimes et al.
patent: 4732245 (1988-03-01), Hiramatsu
patent: 4880091 (1989-11-01), Hasegawa et al.
patent: 4966263 (1990-10-01), Hayasaki
Patent Abstracts of Japan, vol. 13, No. 267 (M-840), Jun. 20, 1989, and JP 1-69859 (Mazda) Mar. 15, 1989.
Patent Abstracts of Japan, vol. 10, No. 307 (M-527), Oct. 18, 1986, and JP 61-119870 (Toyota) Jun. 7, 1986.
Patent Abstracts of Japan, vol. 13, No. 334 (M-855), Jul. 27, 1989, and JP 1-112074 (Mazda) Apr. 28, 1989.

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