Continuously variable transmission with control arrangement and for reducing transmission belt slippage
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United States of America Patent
Stats
-
Jan 16, 2001
Grant Date -
N/A
app pub date -
Dec 30, 1998
filing date -
Dec 30, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A continuously variable transmission, and particularly a control arrangement thereof and a method for reducing belt slippage in the transmission, are disclosed. A single source of constant hydraulic pressure is operatively connected for driving each of the hydraulically operated actuators for axially movable sheaves of primary and secondary pulleys of the transmission. A hydraulic pressure control loop controls the hydraulic pressure applied to the actuator of the secondary pulley as a function of the sensed load of the device being driven on the transmission and the pitch radius of the secondary pulley. An output speed control loop controls the output speed of the transmission driving the device to be driven. Preferably, the output speed control loop may be set to control the output speed at a constant value for driving an aircraft electric generator. The control arrangement and method are simpler and more robust than previous control arrangements and methods.
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