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An Engine-Dynamometer Study of the A/F Compatibility Between a Three-Way Catalyst and an Exhaust Gas Oxygen Sensor
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Abstract
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.
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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.Also In
References
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- Kaneko, Y. Kobayashi, H. Komagome, R. Nakagami, T. Fugui, T. “Catalyst System Development.” Paper 770197 presented at SAE International Automotive Engineering Congress and Exposition Detroit February 1977
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