Patent ID: 7261672
Filing Date: 2007-08-28
Classification: B60K,B60L,B60W,F16H,Y02T,Y10T

Abstract:
1. An apparatus for controlling the operation of a continuously variable transmission (CVT) having hydraulically operated primary and secondary pulleys with varying effective diameters, and a drive belt coupling the primary pulley to the secondary pulley, comprising: a programmable controller; and means associated with said controller for mapping rate of change of ratio to clamping pressure and/or differential pressure between said pulleys in said CVT, and for dynamically controlling acceleration and deceleration of said vehicle from rate of change of ratio; a primary pump fluidly connected to said primary pulley; a secondary pump fluidly connected to said secondary pulley; wherein said primary and secondary pumps are not fluidly connected; and a torque clipping algorithm is used to throttle back the torque to the primary pulley when the clamping pressure is insufficient to prevent slipping of said drive belt.