Patent ID: 6432024
Filing Date: 2002-08-13
Classification: F16H,Y10S,Y10T

Abstract:
A shift control apparatus for a motor vehicle including an internal combustion engine whose output is controlled by an electronic throttle valve for adjusting the flow rate of intake air, and a continuously variable transmission disposed in a power transmission path between the internal combustion engine and drive wheels, and operable to change a speed ratio thereof, comprising:a shift control device configured and connected to control the speed ratio of the continuously variable transmission depending upon operating conditions of the vehicle, such that an input-side rotation speed of the transmission is variable within a first range during normal running of the vehicle; a fault detecting unit configured and connected to determine whether the electronic throttle valve is at fault or not; and a restricting unit configured and connected to restrict the speed ratio of the continuously variable transmission such that the input-side rotation speed of the transmission is variable within a second range when the fault detecting unit determines that the electronic throttle valve is at fault, said second range being set to be narrower than said first range.