초록 ▼

A heavy duty diesel engine having an exhaust system incorporating a catalyst to convert NO to NO2 and a particulate trap on which soot particles are continuously oxidized, and a portion of the exhaust gases are recirculated through a cooler and exhaust gas flow valve before being mixed with air and

A heavy duty diesel engine having an exhaust system incorporating a catalyst to convert NO to NO2 and a particulate trap on which soot particles are continuously oxidized, and a portion of the exhaust gases are recirculated through a cooler and exhaust gas flow valve before being mixed with air and fed to the engine cylinders. The system also incorporates a sensor to detect the amount of NOx in the exhaust to adjust the gas flow valve, thereby adjusting the portion of recirculated exhaust gas fed to the engine cylinders.

대표청구항 ▼

1. A diesel engine system comprising a diesel engine including engine cylinders, an engine management unit and an exhaust system, said exhaust system incorporating a catalyst effective to convert NO to NO2 under normal operating conditions, a carbonaceous particulate trap mounted downstream of the c

1. A diesel engine system comprising a diesel engine including engine cylinders, an engine management unit and an exhaust system, said exhaust system incorporating a catalyst effective to convert NO to NO2 under normal operating conditions, a carbonaceous particulate trap mounted downstream of the catalyst and adapted to oxidize particulates, an exhaust gas recirculation valve for recirculating a portion of the exhaust gases to said engine cylinders wherein said valve is controlled by said engine management unit and the exhaust gases have a volume, and means for cooling the recirculated exhaust gases wherein said means for cooling is mounted between said trap and said valve, wherein said valve is mounted completely downstream of said means for cooling such that the recirculated exhaust gases are cooled by said means for cooling to a temperature of about 80.degree. C. to about 150.degree. C. before the recirculated exhaust gases pass over said valve.