Abstract
A Diesel vehicle can achieve better fuel-consumption-performance than a gasoline vehicle. The diesel vehicle can become an effective method to reduce carbon dioxide if its emissions can be improved to SULEV category level of US LEV III legislation. However, the diesel vehicle equipped with Urea-Selective Catalyst Reduction (SCR) system cannot meet SULEV category because the Urea-SCR system cannot provide sufficient Nitrogen oxide (NOx) conversion efficiency in transient phase of US06 mode and in warming-up phase of FTP-75 mode. Consequently, this research introduced the stoichiometric air-fuel-ratio mode to the diesel vehicle and used the three-way conversion effect of a Diesel oxidation catalyst to assist the NOx reduction effect of Urea-SCR system. As a result, the diesel vehicle was able to meet SULEV category under medium passenger car condition.
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