Transmission ratio control system of a continuously variable tra

Details Transmission ratio control system of a continuously variable tra Transmission ratio control system of a continuously variable tra

1990-12-21

1992-05-19

Braun, Leslie A.

Machine element or mechanism

Rotary driven device adjustable during operation relative to...

Screw and nut adjusting means

180197, 192 4A, 74862, B60K 4116

Patent

active

051137186

ABSTRACT:
A belt drive continuously variable transmission has a primary pulley operatively connected to an engine and a secondary pulley operatively connected to wheels of a motor vehicle, hydraulic cylinders for changing effective diameters of both pulleys, and a transmission ratio control valve for producing a primary pressure applied to the primary cylinder for controlling transmission ratio. An anti-lock brake system is provided on the vehicle. A deceleration of the vehicle is calculated based on vehicle speed. Time from an end of operation of the antilock brake system until the vehicle stops is calculated based on the calculated deceleration and to the vehicle speed. Furthermore, downshifting speed necessary to increase the actual transmission ratio to a maximum transmission ratio before the vehicle stops is calculated based on the calculated time until the vehicle stops and to the actual transmission ratio. In place of the transmission ratio changing speed, the calculated downshifting speed is used when the operation of the antilock brake system ends.

REFERENCES:
patent: 3331480 (1963-09-01), Christenson et al.
patent: 3426624 (1969-02-01), Karig et al.
patent: 3756358 (1973-09-01), Espenschied et al.
patent: 4113076 (1978-09-01), Lee et al.
patent: 4762196 (1988-08-01), Harada
patent: 4829433 (1989-05-01), Nakano et al.
patent: 4840436 (1989-06-01), Burgdorf et al.
patent: 5015043 (1991-05-01), Resch

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