Design of An IC Engine Torque Estimator Using Unknown Input Observer

[+] Author and Article Information
Yong Wha Kim, Giorgio Rizzoni

Department of Mechanical Engineering, The Ohio State University, 206 West 18th Avenue, Columbus, OH 43210-1107

Yue-Yun Wang

Cummins Engine Company, M/C 50197 Box 3005, Columbus, IN 47202-3005

J. Dyn. Sys., Meas., Control 121(3), 487-495 (Sep 01, 1999) (9 pages) doi:10.1115/1.2802500 History: Received February 10, 1998; Online December 03, 2007


The torque produced by each combustion in an engine is one of the most important indices tied to internal combustion engine performance. In this paper, an approach is investigated to estimate engine torque. Instead of employing expensive and delicate combustion pressure sensors to directly measure indicated pressure in each cylinder, unknown input observers are exploited to estimate cylinder indicated torque using one or more low-cost measurements of crankshaft angular position. Necessary and sufficient conditions for the existence of such torque estimators for multi-cylinder engines are presented in the paper; these include the number of angular position sensors required and their suggested placement. Model reduction issues and the number of measurements required to obtain an acceptable estimate are also considered. The approach is applied to a six-cylinder industrial diesel engine.

Copyright © 1999 by The American Society of Mechanical Engineers
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