DocumentCode :
1916544
Title :
Online estimation of operating variables for stepped automatic transmissions
Author :
Watechagit, Sarawoot ; Srinivasan, Krishnaswamy
Author_Institution :
Dept. of Mech. Eng., Ohio State Univ., Columbus, OH, USA
Volume :
1
fYear :
2003
fDate :
23-25 June 2003
Firstpage :
279
Abstract :
This paper presents the development of a model-based estimator to provide real-time information about important, but unmeasurable, operating variables in stepped automatic transmissions. Specifically, model-based estimation of the transmission output shaft torque and the clutch pressure for each clutch involved in the gear shifting process is presented. Knowledge of clutch pressures and output shaft torque can be used for online diagnostics or development of closed-loop control in order to improve shift quality. In the approach described here, only speed measurements are used, viz, transmission input and output speeds and the wheel speed. The estimation technique used in this paper is based on the sliding mode observer. The performance of the estimation scheme is evaluated by simulation. Analysis of the accuracy and robustness of the proposed schemes is also presented.
Keywords :
automobiles; closed loop systems; clutches; observers; real-time systems; robust control; variable structure systems; closed loop control development; clutch pressure; gear shifting process; model based estimator; online diagnostics; online estimation; operating variables; real time information; robustness; sliding mode observer; stepped automatic transmissions; transmission input speed measurement; transmission output shaft torque; transmission output speed measurement; wheel speed measurement; Automatic control; Engines; Gears; Power system modeling; Pressure control; Robustness; Shafts; Sliding mode control; Torque control; Wheels;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Control Applications, 2003. CCA 2003. Proceedings of 2003 IEEE Conference on
Print_ISBN :
0-7803-7729-X
Type :
conf
DOI :
10.1109/CCA.2003.1223326
Filename :
1223326
Link To Document :
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