Control arrangement for a variable pulley transmission

Details Control arrangement for a variable pulley transmission Control arrangement for a variable pulley transmission

1981-04-24

1984-07-03

Gruber, Felix D.

Boots, shoes, and leggings

74866, 474 12, 474 18, 474 28, F16H 918, F16H 1106, F16H 5554, G05D 1702

Patent

active

044583184

ABSTRACT:
A continuously variable transmission (CVT) with adjustable width pulleys has its belt tension and ratio controlled by an electronic-hydraulic system. The CVT also has a fluid-cooled clutch on the output pulley shaft. The engine speed, transmission output speed, throttle position, and gearshift position are sensed, and signals representing this information are passed to a computer. The computer provides set point signals denoting desired engine speed, line pressure, and clutch cooling condition to a control system. An electromechanical valve assembly regulates fluid flow to the CVT primary sheave, to control CVT ratio as a function of the computer provided set engine speed signal. A second electromechanical valve assembly controls the line pressure in the hydraulic system, which is applied to the secondary pulley to maintain belt tension, as a function of the set pressure signal provided by the computer. A solenoid-operated valve, regulated by the control system, either returns waste fluid from the second valve assembly directly to sump, or passes the fluid to the clutch when cooling is indicated.

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