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Authors
Rupp, D.; Onder, Ch.; Guzzella, L.

Identifier
10.3182/20070820-3-US-2918.00080

Index Terms
automotive control,air-fuel ratio,adaptive control,iterative feedback tuning,internal model control,identification for control

Abstract
This paper addresses the air-fuel (A/F) ratio control of an SI engine with a wide-range lambda sensor whose time constant may change during operation. For the feedback control of the A/F ratio, an internal model controller (IMC) is employed. Based on the concept of iterative feedback tuning (IFT), the current value of the sensor time constant needed for the adaptation of the IMC-controller is found by doing well-predefined experiments on the closed-loop control system. The effectiveness of this method is demonstrated with simulations and real experiments on an engine test bench.

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