Title:
DUAL STRATEGY CONTROL FOR A TOROIDAL DRIVE TYPE CONTINUOUSLY VARIABLE TRANSMISSION
Document Type and Number:
WIPO Patent Application WO2001021981
Kind Code:
A9
Abstract:
An apparatus and method for operating a continuously variable transmission (CVT), such as a toroidal drive type transmission, is disclosed. The CVT is selectively operated in either a torque control strategy and a ratio control strategy, depending upon the operating conditions of the vehicle. The transition from the torque control strategy to the ratio control strategy (and vice versa) can be accomplished by simultaneously calculating the control pressures that would result from operation in both the torque and ratio control strategies, and further assigning a weighted value to each of such calculated control pressures based upon the current operating conditions. The summation of such weighted values provides a composite control signal that facilitates a smooth transition between the two control strategies. The transition from the torque control strategy to the ratio control strategy preferably occurs before a mode shift is effected.
Inventors:
MCINDOE GORDON M
LOHR CHARLES B
LOEFFLER JOHN M
LOHR CHARLES B
LOEFFLER JOHN M
Application Number:
PCT/US2000/025888
Publication Date:
October 03, 2002
Filing Date:
September 20, 2000
Export Citation:
Assignee:
TRANSMISSION TECHNOLOGIES CORP (US)
International Classes:
F16H15/38; F16H61/662; F16H61/664; F16H37/08; (IPC1-7): F16H61/00; F16H15/38
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