Neural network model-based automotive engine air/fuel ratio control and robustness evaluation

Authors:
Yu-Jia Zhai;Ding-Li Yu
Affiliations:
Control Systems Research Group, Liverpool John Moores University, UK;Control Systems Research Group, Liverpool John Moores University, UK
Venue:
Engineering Applications of Artificial Intelligence
Year:
2009

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Abstract

Automotive engines are multivariable system with severe non-linear dynamics, and their modelling and control are challenging tasks for control engineers. Current control of engine used look-up table combined with proportional and integral (PI) control and is not robust to system uncertainty and time varying effects. In this paper the model predictive control strategy is applied to engine air/fuel ratio control using neural network model. The neural network model uses information from multivariables and considers engine dynamics to do multi-step ahead prediction. The model is adapted in on-line mode to cope with system uncertainty and time varying effects. Thus, the control performance is more accurate and robust compared with non-adaptive model based methods. To speed up algorithm calculation, different optimisation algorithms are investigated and performance compared. Finally, the developed method is evaluated on a well-known engine benchmark, a simulated mean value engine model (MVEM). The simulation results demonstrate the effectiveness of the developed method.