An Engine-Dynamometer Study of the A/F Compatibility Between a Three-Way Catalyst and an Exhaust Gas Oxygen Sensor 830986
An engine-dynamometer study was performed to quantify the air-fuel ratio (A/F) offset between the window of a three-way catalyst (TWC) and the closed-loop control point of an exhaust gas oxygen (EGO) sensor. In this study, the effects of rpm, torque, EGR, and A/F modulation were explored along with the age of the TWC and EGO sensor. In general, it was determined that the closed-loop EGO sensor control point shifts lean as a function of increasing feedgas NOx concentration, thus causing the engine A/F to move away from the high NOx conversion efficiency regime of the TWC.
Citation: Hamburg, D., Cook, J., Kaiser, W., and Logothetis, E., "An Engine-Dynamometer Study of the A/F Compatibility Between a Three-Way Catalyst and an Exhaust Gas Oxygen Sensor," SAE Technical Paper 830986, 1983, https://doi.org/10.4271/830986. Download Citation
D. R. Hamburg, J. A. Cook, W. J. Kaiser, E. M. Logothetis
Research Staff, Ford Motor Co. Dearborn, MI