Detection and isolation of faults in the exhaust path of turbocharged automotive engines

Salehi, R ; Sharif University of Technology

440 Viewed
  1. Type of Document: Article
  2. DOI: 10.1007/s12239-015-0014-5
  3. Abstract:
  4. 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 model-based 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 1.7-liter 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 stuck-closed fault
  5. Keywords:
  6. FDI ; Leakage ; SI engine ; Sliding mode observer ; Turbocharger ; Wastegate ; Compressors ; Control systems ; Diesel engines ; Engines ; Exhaust manifolds ; Fault detection ; Leakage (fluid) ; Sliding mode control ; Superchargers ; Turbomachinery ; SI Engines ; Sliding mode observers ; Automobile engine manifolds
  7. Source: International Journal of Automotive Technology ; Volume 16, Issue 1 , 2015 , Pages 127-138 ; 12299138 (ISSN)
  8. URL: http://link.springer.com/article/10.1007/s12239-015-0014-5