Patent ID: 6634982
Filing Date: 2003-10-21
Classification: B60W,F16H,Y10T

Abstract:
An automatic transmission control apparatus for a vehicle comprising:a primary pulley; a secondary pulley; a belt stretched around the primary pulley and the secondary pulley; travel environment determination means for determining at least one parameter related to travel environment of the vehicle; torque variation estimation means for estimating variation in transmission torque during travel, based on the determined travel environment; transmission control means for generating a shift signal; primary pulley regulating means for regulating said primary pulley so as to change effective diameters of the primary and secondary pulleys, responsive to the shift signal; pinching pressure change processing means for determining a pinching pressure in accordance with the estimated variation in transmission torque; and pinching pressure regulating means for regulating said secondary pulley to change pinching pressure exerted on said belt by said secondary pulley in accordance with the determined pinching pressure.