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RESEARCH PAPERS

Estimation of Vehicle Shaft Torque Using Nonlinear Observers

[+] Author and Article Information
R. A. Masmoudi

Mechanical Engineering Department, Massachusetts Institute of Technology, Cambridge, MA 02139

J. K. Hedrick

University of California, Berkeley, Berkeley, CA 94720

J. Dyn. Sys., Meas., Control 114(3), 394-400 (Sep 01, 1992) (7 pages) doi:10.1115/1.2897360 History: Received April 19, 1990; Revised December 01, 1991; Online March 17, 2008

Abstract

Current closed-loop automotive shift control algorithms could greatly benefit if a measurement of the drive axle shaft torque was available. Direct measurements using strain gauges are too expensive for commercial applications. Magnetic pickup sensors that count the passage of gear teeth provide very inexpensive RPM measurements and are currently being used in production vehicles. This paper shows through simulations how these sensors can be used with a nonlinear observer technique (sliding mode) to estimate axle shaft torque from measurements of transmission output speed and driven wheel speed.

Copyright © 1992 by The American Society of Mechanical Engineers
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