Title: A nonlinear dynamic modelling of SI engines for controller design

Authors: Paljoo Yoon, Myoungho Sunwoo

Addresses: School of Mechanical Engineering, Hanyang University, 17 Haengdang-Dong, Sungdong-Ku, Seoul 133-791, Republic of Korea. School of Mechanical Engineering, Hanyang University, 17 Haengdang-Dong, Sungdong-Ku, Seoul 133-791, Republic of Korea

Abstract: A control-oriented nonlinear dynamic SI engine model is developed to represent a spark-ignited engine over a wide range of operating conditions. The model includes intake manifold dynamics, fuel film dynamics, and engine rotational dynamics with transport delays inherent in the four-stroke engine cycles. The model is mathematically compact enough to run in real time, and can be used as an embedded model within a control algorithm or an observer. The model is validated with engine-dynamometer experimental data in steady and transient operating conditions, and its accuracy over a wide operating range is proved to be within ±5% Also, the model can be used in the design and development of a powertrain controller.

Keywords: engine control system; MBT (minimum spark advance for best torque); intake manifold pressure dynamics; fuel film dynamics; engine rotational dynamics; AFR (air-to-fuel ratio).

DOI: 10.1504/IJVD.2001.001944

International Journal of Vehicle Design, 2001 Vol.26 No.2/3, pp.277-297

Published online: 15 Aug 2003 *

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