Confidence Level Analysis for On-Board Estimation of SI Engine Catalytic Converter Efficiency

Autor: G. Flauti, Cesare Pianese, Ivan Arsie, Carlo Siviero, Gabriele Serra, C. Barberio, Gianfranco Rizzo, Roberto Flora
Rok vydání: 2000
Předmět:
Zdroj: IFAC Proceedings Volumes. 33:139-144
ISSN: 1474-6670
DOI: 10.1016/s1474-6670(17)37350-0
Popis: For the on-board diagnosis of the catalytic converter for SI engine, the comparison between upstream and downstream catalyst lambda signals is used to derive information about the actual conversion efficiency. In the present work three indices have been computed by means of both deterministic and statistical approaches, allowing to perform confidence analysis concerning the estimation of catalyst efficiency. The proposed approaches have been applied to process experimental data measured during New European Driving Cycle (ECE+EUDC) and to estimate the probability of fault occurrence during intermediate aged catalyst status. Furthermore, the three indices have been compared with respect to the risk levels associated with both undetected catalyst faults and false alarms.
Databáze: OpenAIRE