Investigation about Air Fuel Ratio Control at Transient State by Fusing Adaptive PID Control and Adaptive Feedforward System

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  • 適応PID制御と適応FF機構が融合した過渡時空燃比制御の検討

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The regulation about emission purification and fuel consumption of an automobile becomes increasingly strict for environmental issue. Especially, the performance while transient state is focused on because transient state was increased in the new JC08 emission test-mode. Emission purification of the gasoline engine is attained both using a three way catalyst and controlling air fuel ratio(AFR) by means of an oxygen sensor while steady state. However, while transient state, AFR is deteriorated because of non-linear character such as a fuel wall-wet flow balance, allowance of each engine, aging and ambient of operation. Therefore, highly performed controller is necessary for AFR control at transient state. Both a feedforward and a feedback control were required to obtain such performance. However, each control system was designed independently. Therefore harmonizing both control system is desired when those were performed at a same time. In this paper, adaptive gain system was respectively equipped to the feedforward system and the feedback control. After some time repeat of a regulate control, those control system were fused and performed as a feedforward controller with a small feedback compensation. Then, the experiment were also carried out at different operating condition. The results showed a good regulating performance as a transient state regulator.

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