Method of estimating torque of transmission clutch

Abstract

A method of estimating a torque of a transmission clutch may include adjusting an error, deducing an estimated engine angular speed and deducing an estimated clutch torque. The error may be adjusted by deducing an engine transient torque based on an engine angular speed measured using a sensor, an engine static torque deduced using a data map and a load torque depending on a driving load. The estimated engine angular speed may be deduced based on the engine static torque and the engine transient torque. The estimated clutch torque may be deduced by summing an integration value and an error compensation value. The integration value and the error compensation value may be deduced based on a difference between the estimated engine angular speed and the measured engine angular speed.

Description

technical field [0001] The present invention relates generally to a transmission clutch and, more particularly, to a method of accurately estimating the torque of a transmission clutch transmitted through dry clutch slip of a dual clutch transmission. Background technique [0002] Recently, the development of dual clutch transmissions (DCTs) is actively underway because DCTs can achieve not only the driving convenience of automatic transmissions but also the high fuel efficiency and high power efficiency of manual transmissions. DCTs are semi-automatic transmissions based on manual transmission systems in which two torque transmission shafts are provided and clutches are controlled automatically without the need for a torque converter. DCTs have the advantage of high fuel efficiency. However, in a DCT system using a dry clutch, the two working parts of the clutch are directly engaged without a torque converter, so the starting and transmission performance of the vehicle dep...

AI Technical Summary

Problems solved by technology

However, the point in time at which clutch torque information is requested always corresponds to an engine transient (creep, disengagement, etc.), so there is a discrepancy between the engine torque from the ECU and the actual torque

Therefore, the estimated clutch torque based on the uncertain engine torque will also be in error, which is problematic

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