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Fine Control System for Multi-plate Lock-up Clutch

Article of Honda R&D Technical Review Vol.21 No.2


Expanding the range of operation of lock-up clutch (LC) control to reconcile the achievement of a drive feel with a directness similar to that available from an MT vehicle and increased fuel efficiency has become a trend in the area of automatic transmissions.
The combination of a multi-plate lock-up clutch torque converter (“multi-plate LC TC” below) and an LC direct control hydraulic circuit that provide LC control in response to driving conditions has enabled the realization of a fine control system for an LC that has enhanced the response, cooling, and control performance of the LC.
The application of this LC control system has enabled the range of LC control to be expanded from the previous low throttle opening range to the high throttle opening, low engine speed range. As a result, the time for acceleration from 0-100 km/h at wide-open throttle has been reduced by 0.2 sec, and fuel efficiency in US06 mode and actual fuel efficiency have been increased by approximately 3%.


(1) Abe, H., Tsuruoka, M., Muto, A., Kato, M., Fujiwara, H.: Development of Super Ultra Flat Torque Converter with Multi Plate Lock-up Clutch, SAE Paper, 2009-01-0141(2009)
(2) Abe, H., Takahashi, T., Tsuruoka, M., Takano, H.: Super Ultra Flat Torque Converter with Multi Plate Lock-up Clutch, Honda R&D Technical Review, April, 2009, p.114-119
(3) Niwa, K.: Toyota’s 8-Speed Automatic Transmission for Passenger Cars, Journal of Society of Automotive Engineers of Japan, Vol. 62, No. 3, p. 53-57 (2008)

Author (organization or company)

Hiroshi TAKEI(Automobile R&D Center)、Yutaka ISHIKAWA(Automobile R&D Center)、Yoshiharu SAITO(Automobile R&D Center)、Yoshimichi TSUBATA(Automobile R&D Center)

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