Reduction of catalyst light-off time in the cold start period is crucial to reduce the HC and CO emissions and to meet the ULEV emission regulation. In this study, a new approach to solve this problem has been studied experimentally. The UEGI (Unburne...
Reduction of catalyst light-off time in the cold start period is crucial to reduce the HC and CO emissions and to meet the ULEV emission regulation. In this study, a new approach to solve this problem has been studied experimentally. The UEGI (Unburned Exhaust Gas Ignition) technology developed in this study ignites the unburned fuel-air mixture at the exhaust manifold to warmup a CCC (Close-coupled Catalytic Converter) during cold start. The experimental results showed that the UEGI technology can effectively shorten the catalyst light-off time and reduce the HC and CO emissions.