Continuous speed variable transmission control method

Details Continuous speed variable transmission control method Continuous speed variable transmission control method

1990-09-26

1991-12-24

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

3644241, B60K 4122

Patent

active

050741667

ABSTRACT:
A method for controlling a continuously variable transmission having a pair of pulleys each of which includes a groove defined between a stationary pulley element and a movable pulley element, including the step of using hydraulic oil for increasing and decreasing the width of the groove to respectively decrease and increase the radius of rotation of a belt looped around the pulleys to thereby vary the belt ratio. A hydraulic clutch is provided, and connection and disconnection of the clutch is controlled according to various predetermined control modes. Line pressure is controlled with a control device which uses both open loop control, and closed loop feedback control responsive to a signal from a pressure sensor. During open loop control, the line pressure is controlled so as to reflect the clutch pressure during a vehicle start mode.

REFERENCES:
patent: 4648496 (1987-03-01), Petzold et al.
patent: 4665773 (1987-05-01), Hiramatsu et al.
patent: 4670843 (1987-06-01), Matsumura et al.
patent: 4718308 (1988-01-01), Haley
patent: 4729103 (1988-03-01), Oshiage et al.
patent: 4856380 (1989-08-01), Murano et al.
patent: 4958538 (1990-09-01), Yamashita et al.
patent: 4962678 (1990-10-01), Murano et al.
patent: 4964317 (1990-10-01), Murano et al.
patent: 4982822 (1991-01-01), Petzold et al.

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