A New Development of Internal Combustion Engine Air-Fuel Ratio Control With Second-Order Sliding Mode

[+] Author and Article Information
Shiwei Wang

Control Systems Research Group, School of Engineering, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, UK

D. L. Yu1

Control Systems Research Group, School of Engineering, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, UKd.yu@ljmu.ac.uk


Corresponding author.

J. Dyn. Sys., Meas., Control 129(6), 757-766 (Mar 07, 2007) (10 pages) doi:10.1115/1.2789466 History: Received March 08, 2006; Revised March 07, 2007

A novel application of a second-order sliding mode control (SMC) scheme to the air-fuel ratio (AFR) control of automobile internal combustion engines is developed in this paper. In this scheme, the sliding surface S[x(t)] is steered to zero in finite time by using the discontinuous first-order derivative of a control variable u̇c(t), and the corresponding actual control variable uc(t) turns out to be continuous, which significantly reduces the undesired chattering. Its sliding gain is adjusted by a novel radial basis function network based adaptation method derived using the Lyapunov theory. It not only avoids handling the unavailable parameters and variables, but also saves the unnecessary manual adjusting time of the second-order SMC. The proposed method is applied to a widely used engine benchmark, the mean value engine model for evaluation. The simulation results show substantially improved AFR control performance compared with the conventional SMC.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Schematic of engine dynamic system

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Figure 2

Throttle angle change in simulations

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Figure 3

AFR control result of the conventional SMC

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Figure 4

AFR control result of the second-order SMC scheme

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Figure 5

AFR control result of the adaptive sliding gain

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Figure 6

The adaptive sliding gain



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