Mitigation of the cold-start emissions using tailor-designed oxidation catalysts and fast idle light-off strategy for Gasoline Compression Ignition engines
Christos Kalamaras, Saudi Aramco
Stricter fuel economy standards have led to the automotive industry moving forward with higher efficiency combustion modes, such as Gasoline Compression Ignition (GCI). These combustion modes need to meet environmental policies placed on the vehicle emissions before they are able to be commercially implemented. Much lower exhaust temperatures and higher CO and hydrocarbon concentrations lead to a significant challenge in reducing the emissions of these advanced combustion modes, especially during cold-start conditions, as current catalytic exhaust systems are not able to give adequate activity. This study evaluates the cold-start performance of a series of tailor-designed GCI oxidation catalysts combined with near stoichiometric air/fuel ratio Spark Ignited late combustion to effectively heat up the catalyst. The design of superior oxidation catalysts under fast idle light-off poses a promising approach in order to meet the increasingly more rigorous emissions regulations and efficiency standards.