Method for controlling shift points in a continuously variable t

Details Method for controlling shift points in a continuously variable t Method for controlling shift points in a continuously variable t

1995-06-06

1997-04-29

Ta, Khoi Q.

Planetary gear transmission systems or components

Fluid drive or control of planetary gearing

Fluid pump and motor in one of plural paths to or from...

475 76, 475 78, F16H 3708, F16H 4704

Patent

active

056243391

ABSTRACT:
A method is disclosed for controlling the shift points in a continuously variable transmission having a closed loop control wherein the output of the continuously variable transmission is generated by a hydrostatic transmission or by a combination of the hydrostatic transmission and a mechanical transmission having a summing planetary and high and low speed clutches. The method comprises the steps of sensing the input and output speeds of the continuously variable transmission and the speed of the output from the hydrostatic transmission to monitor the speed ratios therein, comparing an operative transmission speed ratio of the transmissions to a predefined established transmission speed ratio, disengaging the high or low speed clutch once the predefined established transmission speed ratio is reached, increasing or decreasing the speed of the output of the hydrostatic transmission following disengagement of the high or low speed clutch, and engaging the other of the high or low speed clutch once the change in output speed of the hydrostatic transmission has substantially synchronized the speeds relative to the high or low speed clutches so that the output torque and speed of the transmission before and after the shift is substantially equal.

REFERENCES:
patent: 4291592 (1981-09-01), Meyerle et al.
patent: 4896563 (1990-01-01), Manor et al.
patent: 5011463 (1991-04-01), Jarchow et al.
patent: 5337629 (1994-08-01), Kita
patent: 5403241 (1995-04-01), Jarchow et al.
patent: 5406793 (1995-04-01), Maruyama et al.

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