Patent ID: 6317670
Filing Date: 2001-11-13
Classification: F16H,Y10T

Abstract:
A control unit of an automatic transmission having torque estimating means for estimating an output shaft torque in a torque converter using a characteristic of the torque converter and controlling the automatic transmission by using the estimated torque converter output shaft torque,wherein said torque estimating means corrects at least one of a pump capacity characteristic and a torque ration characteristic of the torque converter by using an oil temperature of the automatic transmission and at least one of parameters expressing an operating state, and parameters comprising a torque of an input of the torque converter, an input shaft speed in the torque converter, a relative velocity difference between the input shaft and the output shaft in the torque converter, a velocity change component of the input shaft in the torque converter, a velocity change component of the output shaft in the torque converter, a relative velocity change component of the input shaft and the output shaft in the torque converter, a driving force of the output shaft in the torque converter, and a ratio of the driving forces between the input shaft and the output shaft in the torque converter, thereby estimating the torque converter output shaft torque.