Abstract
In 4-stroke internal combustion engines, air-fuel ratio control is a challenging task due to the rapid changes of engine throttle, especially during transient operation. To improve the transient performance, managing the cycle-to-cycle transient behavior of the mass of the air, the fuel and the burnt gas is a key issue due to the imbalance of cyclic combustion process. This paper address the model-based estimation and control problem for cyclic air-fuel ratio of spark-ignition engines. A discrete-time model of air-fuel ratio is proposed, which represents the cycle-to-cycle transient behavior of in-cylinder state variables under the assumptions of cyclic measurability of the total in-cylinder charge mass, combustion efficiency and the residual gas fraction. With the model, a Kalman filter-based air-fuel ratio estimation algorithm is proposed that enable us to perform a feedback control of air-fuel ratio without using lambda sensor. Finally, experimental validation result is demonstrated to show the effectiveness of proposed estimation and control scheme that is conducted on a full-scaled gasoline engine test bench.
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Madan KUMAR received the M.Sc. degree from Indian Institute of Technology Madras, India, in 2014. He is currently pursuing the Ph.D degree with the Department of Mechanical Engineering, Sophia University, Tokyo, Japan. His current research interests include cyclic control of air-fuel ratio, residual gas fraction and NOx emission control.
Tielong SHEN received the Ph.D. degree in Mechanical Engineering from Sophia University, Tokyo, Japan, in 1992. He has been a faculty member with the Department of Mechanical Engineering, Sophia University, since 1992, where he currently serves as a professor with the Department of Engineering and Applied Sciences. His current research interests include control theory and application in mechanical systems, power systems, and automotive power train.
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Kumar, M., Shen, T. Estimation and feedback control of air-fuel ratio for gasoline engines. Control Theory Technol. 13, 151–159 (2015). https://doi.org/10.1007/s11768-015-4148-9
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DOI: https://doi.org/10.1007/s11768-015-4148-9