Authors: R Salehi A Alasty M Shahbakhti G Vossoughi
Publish Date: 2015/02/04
Volume: 16, Issue: 1, Pages: 127-138
Abstract
Detection and isolation of faults in the exhaust gas path of a turbocharged spark ignition SI engine is an essential part of the engine control unit ECU strategies to minimize exhaust emission and ensure safe operation of a turbocharger This paper proposes a novel modelbased strategy to detect and isolate an exhaust manifold leakage and a stuckclosed wastegate fault The strategy is based on a globally optimal parameter estimation algorithm which detects a virtual hole area in the exhaust manifold The estimation algorithm requires observation of the exhaust manifold’s input and output flows The input flow is estimated by a nonlinear Luenberger observer which is analytically shown to be robust to the faults in the exhaust manifold The output flow of the exhaust manifold is estimated by a sliding mode observer The designed fault detection and isolation FDI strategy is tested with the experimental data collected from a 17liter turbocharged SI engine The validation results show that the FDI strategy can successfully detect a leakage fault caused by a 5 mm hole in the exhaust manifold and can identify the wastegate stuckclosed fault
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