Application of Reduced Order Model to Automotive Engine Control System

[+] Author and Article Information
E. Kamei, H. Namba, K. Osaki, M. Ohba

R&D Dept. (Electronics), Nippondenso Co., Ltd., Aichi 448, Japan

J. Dyn. Sys., Meas., Control 109(3), 232-237 (Sep 01, 1987) (6 pages) doi:10.1115/1.3143850 History: Received November 01, 1986; Online July 21, 2009


This study deals with a multivariable automotive engine control system using a reduced order model. The system controls the engine torque and air fuel rate (A/F) simultaneously using linear quadratic (LQ) control theory. The mathematical model is obtained using a statistical identification method. The instrumental variable method is employed to estimate the parameters of the mathematical model. This model is reduced to an eighth-order one using minimal realization. A 16-bit microprocessor is employed for actual contruction of the control system, and a step response test was conducted. As a result, the system yielded a response similar to the simulation results.

Copyright © 1987 by ASME
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