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By-Pass Hydrocarbon Absorber System for ULEV
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English
Abstract
A by-pass zeolite adsorber system consisting of a first catalyst, a by-pass loop containing the zeolite adsorbers followed by a downstream second catalyst was FTP tested using a U.S. vehicle equipped with a 3.8 L, V6 engine. The system exhibited ULEV emissions performance with hydrocarbon adsorption and regeneration (desorption and oxidation) within the FTP cycle and required only a single diversion valve within the exhaust line. Adsorption takes place during the initial 70 seconds of the FTP cycle. The adsorbers were regenerated with the exhaust gas plus injected air.
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Citation
Williams, J., Patil, M., and Hertl, W., "By-Pass Hydrocarbon Absorber System for ULEV," SAE Technical Paper 960343, 1996, https://doi.org/10.4271/960343.Also In
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