Patent ID: 6695742
Filing Date: 2004-02-24
Classification: F16H,Y10T

Abstract:
A control device for a V belt type continuously variable transmission for a vehicle, the transmission being connected to an engine via a torque converter, and provided with a variable pulley formed from a primary pulley and a secondary pulley and a V belt, in which a contact width of the V belt with the variable pulley is controlled by a transmission control section that controls oil pressure to the variable pulley so as to continuously change a transmission gear ratio between the primary pulley and the secondary pulley, the transmission control section comprising:an engine torque calculation section for calculating output torque from the engine; an input side revolution speed sensor for detecting a revolution speed on an input side of the torque converter; an output side revolution speed sensor for detecting a revolution speed on an output side of the torque converter; a torque converter speed ratio calculation section for calculating a speed ratio between said input and said output of the torque converter based on the respective revolution speeds detected by the input side revolution speed sensor and the output side revolution speed sensor; a torque ratio calculation for calculating from torque converter speed ratio a torque ratio between said input and said output of the torque converter; an input torque estimation section for estimating from the torque ratio and the output torque from the engine an input torque input into the continuously variable transmission; and a line pressure setting section that set oil pressure for the variable pulley based on the input torque estimated by the input torque estimation section, wherein the torque converter speed ratio calculation section is provided with a correction amount calculation section for calculating a correction amount by which the input side revolution speed is to be increased in the initial stages of the depressing of the accelerator pedal relative to a ratio of the respective revolution speeds detected by the output side revolution speed sensor and the input side revolution speed sensor, and outputs the speed ratio in which the ratio has been corrected by the correction amount.