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Effects of Engine Operating Conditions on Catalytic Converter Temperature in an SI Engine
Technical Paper
2002-01-1677
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
To meet stringent emission standards, a considerable amount of development work is necessary to ensure suitable efficiency and durability of catalyst systems. The main challenge is to reduce the engine cold-start emissions. Close-coupled catalyst (CCC) provides fast light-off time by utilizing the energy in the exhaust gas. However, if some malfunction occurred during engine operation and the catalyst temperature exceeds 1050°C, the catalytic converter becomes deactivated and shows poor conversion efficiency.
Close-coupled catalyst temperature was investigated under various engine operating conditions. All of the experiments were conducted with a 1.0L SI engine at 1500-4000 rpm. The engine was operated at no load to full load conditions. Exhaust gas temperature and catalyst temperature were measured as a function of lambda value (0.8-1.2), ignition timing (BTDC 30°-ATDC 30°) and misfire rates (0-28%). It was found that ignition retard and misfire can result in the deactivation of the catalytic converter, which eventually leads the drastic thermal aging of the converter. Significant reduction in light-off time can be achieved with proper control of ignition retard and misfire, which can reduce cold-start HC emissions as well. Exhaust gas temperature was also predicted according to engine speed, air/fuel ratio and ignition timing to complement the experimental results.
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Lee, S., Bae, C., Lee, Y., and Han, T., "Effects of Engine Operating Conditions on Catalytic Converter Temperature in an SI Engine," SAE Technical Paper 2002-01-1677, 2002, https://doi.org/10.4271/2002-01-1677.Also In
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