Patent ID: 6142908
Filing Date: 2000-11-07
Classification: F16H,Y10T

Abstract:
A speed ratio controller of a continuously variable transmission for a vehicle, said continuously variable transmission continuously changing a speed ratio by displacement of a speed change medium in response to an actuator, said controller comprising:sensors for detecting a real speed ratio, anda microprocessor programmed to:calculate a target speed ratio i* of said transmission,calculate a control amount v of said actuator so that said real speed ratio i coincides with the target speed ratio i*,calculate a command value u by correcting said control amount v based on a non-linear relation between said displacement and said real speed ratio, andcontrol said actuator based on the command value u,wherein said speed change medium comprises a power roller which varies said real speed ratio i according to a variation of a gyration angle .phi. of said power roller, said displacement is represented by said gyration angle .phi., and said microprocessor is programmed to calculate said command value u by multiplying said control amount v by an inverse function h.sup.-1 (i) of a first function h(.phi.), said first function h(.phi.) representing said real speed ratio i by said gyration angle .phi..