UENR0623-02 19 Engine Operation The wall flow Diesel Particulate Filter (DPF) is designed to contain all the ash up to the ash service interval. Refer to Operation and Maintenance Manual for more information. Exhaust gas cooler (NRS) Cylinder head Water temperature regulator (thermostat) No ash service is required for the through flow Diesel Particulate Filter (DPF). The engine aftertreatment system is designed to oxidize the soot in the DPF at the same rate as the soot is produced by the engine. The oxidization of the soot will occur when the engine is operating under normal conditions. The soot in the DPF is constantly monitored.
The regeneration system is passive with an additional Oxy-Exotherm system. The Oxy-Exotherm system operates by injecting fuel after the main fuel injection period. The fuel is then burnt over a catalyst to raise the temperature of the exhaust gases to 650° C (1202° F). If the engine is operated in a way that produces more soot than the oxidized soot, the engine management system will automatically activate systems to raise the exhaust temperature. The raising of the exhaust temperature will ensure that more soot is oxidized than the soot that is produced by the engine. The oxidization of more soot returns the DPF to a reduced level of soot.
The systems are then deactivated when the soot level has been reduced. The engine ECM must know how much soot is in the DPF. Measurement of soot is accomplished through the following means: Soot Load Estimation Model that is based on engine operating conditions Delta pressure measurement across the DPF used to estimate the soot load by evaluation of the flow resistance of the Diesel Particulate Filter (DPF) The Electronic Control Module (ECM) uses the soot measurement information to determine if the engine operating conditions need to be adjusted in order to oxidize the soot at an increased rate. i04169911 Cooling System Introduction The cooling system has the following components:
Radiator Water pump Cylinder block Oil cooler