A switch model approach for uego sensor diagnostics in the presence of asymmetric faults

摘要: A SWITCH MODEL APPROACH FOR UEGO SENSOR DIAGNOSTICS IN THE PRESENCE OF ASYMMETRIC FAULTS Hassene Jammoussi, Matthew A. Franchek, Karolos Grigoriadis Department of Mechanical Engineering University of Houston N207 Engineering Building 1 Houston, TX 77204, USA mfranchek@uh.edu Imad H. Makki, Stephen B. Smith, James M. Kerns PT Controls Research and Advance Engineering Ford Motor Company Research and Innovation Center Dearborn, MI 48126, USA ABSTRACT In this paper a diagnostics approach for the universal ex- haust gas oxygen (UEGO) sensor in spark ignition (SI) in- ternal combustion engines is proposed. Due to possible ad- ditional lag or delay in the transition of the air-fuel ratio (AFR) from lean to rich or rich to lean, the sensor mea- surement affects the closed-loop performance and may lead to instability of the feedback system. The paper discusses …