Patent ID: 6513611
Filing Date: 2003-02-04
Classification: B60K,F16H

Abstract:
A system for controlling a speed of a vehicle having a continuously variable transmission which transmits output torque generated by an internal combustion engine mounted on the vehicle to drive wheels of the vehicle, and a cruise controller which controls the speed of the vehicle to a desired speed in response to an instruction to cruise control inputted by a vehicle operator, comprising:operating condition detecting means for detecting operating conditions of the engine and the vehicle including at least an opening of a throttle valve and the speed of the vehicle; a throttle actuator which is connected to the throttle valve to move the throttle valve; first shift controlling means for controlling a speed ratio of the continuously variable transmission based at least on the detected opening of the throttle valve and the detected speed of the vehicle; running resistance determining means for determining a running resistance acting on the vehicle; and second shift controlling means for controlling the speed ratio of the continuously variable transmission based at least on the determined running resistance and the detected speed of the vehicle; wherein the second shift controlling means controls the speed ratio of the continuously variable transmission based at least on the determined running resistance and the detected speed of the vehicle until a predetermined condition is met from the instruction inputted to the cruise control.