Revolution speed ratio control system for a continuously variable transmission

Patent · Tue Dec 13 04:00:00 EST 1988

OSTI ID:6410921

Hattori, K; Suzuki, H; Yamaguchi, H; Ogasawara, T

This patient describes revolution speed ratio control system for a continuously variable transmission comprising a driving pulley provided on an input shaft; a driven pulley provided on an output shaft disposed in parallel with the input shaft; an endless belt wound on both the pulleys; each of the pulleys comprising a fixed member secured to the input or output shaft and having a conical surface, and a movable member which has a conical surface facing that of the fixed member and is provided so that the movable member is rotated together with the input or output shaft and can be slid on the shaft in the axial direction thereof; and the endless belt has both its oblique side surfaces frictionally engaged with the conical surfaces of the fixed and movable members; an electronic control circuit including a means for calculating the actual revolution speed ratio between the driving and driven pulleys of the transmission, a means for generating a first electric control signal corresponding to the difference between the actual revolution speed ratio and an aimed revolution speed ratio between the pulleys determined by information of the input torque of the input shaft and required torque for the output shaft, and a means for generating a second electric control signal determined by the sum of an electric signal corresponding to the actual revolution speed ratio and an electric signal corresponding to the difference; and a hydraulic control circuit including a pressure oil source, a first cylinder which is provided on the input shaft and supplied with working oil from the pressure oil source to push the movable member of the driving pulley toward the fixed member thereof.

• Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi
• Patent Number(s): US 4790214
• OSTI ID: 6410921
• Country of Publication: United States
• Language: English

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