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Effect of Exhaust Valve Timing on Gasoline Engine Performance and Hydrocarbon Emissions
Technical Paper
2004-01-3058
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Despite remarkable progress made over the past 30 years, automobiles continue to be a major source of hydrocarbon emissions. The objective of this study is to evaluate whether variable exhaust valve opening (EVO) and exhaust valve closing (EVC) can be used to reduce hydrocarbon emissions. An automotive gasoline engine was tested with different EVO and EVC timings under steady-state and start-up conditions.
The first strategy that was evaluated uses early EVO with standard EVC. Although exhaust gas temperature is increased and catalyst light-off time is reduced, the rapid drop in cylinder temperature increases cylinder-out hydrocarbons to such a degree that a net increase in hydrocarbon emissions results. The second strategy that was evaluated uses early EVO with early EVC. Early EVO reduces catalyst light-off time by increasing exhaust gas temperature and early EVC keeps the hydrocarbon-rich exhaust gas from the piston crevice from leaving the cylinder. The net result is that start-up hydrocarbon emissions are reduced by 27%.
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Citation
Bohac, S. and Assanis, D., "Effect of Exhaust Valve Timing on Gasoline Engine Performance and Hydrocarbon Emissions," SAE Technical Paper 2004-01-3058, 2004, https://doi.org/10.4271/2004-01-3058.Also In
SI Engine Performance and Additives, Gasoline Engine Cold Start, and Direct Injection
Number: SP-1895 ; Published: 2004-10-25
Number: SP-1895 ; Published: 2004-10-25
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