Speed ratio control for a step-lessly variable vehicle transmission

摘要

A control system for controlling a steplessly variable power transmission device for a motor vehicle. The speed ratio of the transmission mechanism is based upon vehicle operating conditions, and particularly upon the vehicle speed and the engine load, either in terms of throttle setting or engine load pressure. Manual selector means are provided to select one of two control mode patterns for either economical operation or for power operation, and each of the control modes provides a different ratio of transmission input speed to output speed.