Patent ID: 6013006
Filing Date: 2000-01-11
Classification: F16H,Y10T

Abstract:
A speed ratio controller for a continuously variable transmission of a vehicle comprising:a sensor for detecting an output shaft rotation speed of said transmission,a sensor for detecting a degree of accelerator pedal depression, anda microprocessor programmed to:compute a target input shaft rotation speed of said transmission from said output shaft rotation speed and said degree of accelerator pedal depression,compute a target speed ratio from said target input shaft rotation speed and said output shaft rotation speed, andcompute a command speed ratio based on said target speed ratio and a predetermined dynamic characteristic,wherein said microprocessor is further programmed to:compute a deviation between said target speed ratio and said command speed ratio,compute a variation amount of said target input shaft rotation speed,determine whether an upshift characteristic is any of an auto upshift, foot release upshift, and foot return upshift based on said speed ratio deviation, degree of accelerator pedal depression, and variation amount of target input shaft rotation speed, andset said dynamic characteristic according to said determined upshift characteristic.