Control Technology for a Passenger Car Diesel Engine equipped with the DPNR system

A compact diesel engine with DPNR (Diesel Particulate-NOx Reduction system) has been developed. The new catalytic converter for DPNR has fine porous ceramic wall flow filter similar to a DPF (Diesel Particulate Filter), coated with NOx storage reduction catalyst. It can reduce NOx and particulate matter simultaneously. An exhaust port fuel injection system has been newly developed. It creates rich exhaust gas condition to reduce NOx and SOx, irrespective of lean engine operating conditions. In combination with the exhaust fuel injection and engine improvements, very low exhaust emission level, less than half of the European STEP4 regulation standard, is achieved.