The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 08, 2000
Filed:
Dec. 30, 1998
Shan-Chin Tsai, Rockford, IL (US);
William G Durtschi, Rockford, IL (US);
Hamilton Sundstrand Corporation, Rockford, IL (US);
Abstract
A continuously variable transmission, and particularly a control arrangement thereof and a method for recovering belt slippage in the transmission, are disclosed. A source of 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 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 during normal operation of the transmission. Preferably, the output speed control loop may be set to control the output speed at a constant value for driving an aircraft electric generator. A belt speed matching loop overrides the output speed control loop for adjusting the transmission ratio when a condition of belt slipping is detected to recover from belt slipping.