Partial exhaust gas recirculation system for use in internal combustion engine, has cooler whose walls are in contact with exhaust gases and provided with coating for limiting formation of unburned hydrocarbon deposits output from gases

摘要

The system has an exhaust gases recirculated cooler (3c) whose walls are in contact with exhaust gases and provided with a coating i.e. PTFE, for limiting formation of unburned hydrocarbon deposits output from the exhaust gases. The cooler is connected with a control valve (3e). The coating is placed in frigid zones of the cooler. The cooler includes a stainless steel channel in which the exhaust gases are circulated. The coating is adapted to resist higher temperatures of 500 degrees Celsius and limits adherence of carbonaceous precursors.