SPROCKET AS 6C3495 - Caterpillar

Reduction of Particulate Emissions
The diesel particulate filter (DPF) and the ARD work together in order to reduce particulate emissions. The generation of soot is a normal process during engine operation. The DPF collects the soot and the engine oil in the exhaust. The soot is converted into gas and the engine oil is converted into ash.The temperature of the DPF must be above a particular value in order for regeneration to occur. The exhaust gas provides heat for the regeneration process. There are two types of regeneration:Passive regeneration - The engine provides sufficient exhaust gas temperature for regeneration.Active regeneration - The engine's duty cycle does not provide sufficient exhaust temperature for passive regeneration. The ARD operates in order to raise the temperature of the exhaust gas. When the regeneration process is complete, the ARD turns off.
The temperature of the exhaust gas and the temperature of the exhaust system components can reach up to 650 °C (1202 °F) during regeneration. An unexpected failure of the engine or an unexpected failure of the aftertreatment system may increase temperature at the diesel particulate filter to as high as 900 °C (1652 °F) gas temperature. This may result in fire, burn, or explosion hazards, which may result in personal injury or death. Do not expose flammable material or explosive atmospheres to exhaust gas or to exhaust system components during regeneration.
Modes of Active Regeneration
Stationary RegenerationA stationary regeneration is an active regeneration that is initiated by the operator via the ARD force switch. The vehicle must be stopped in order for a stationary regeneration to occur.Engine Warm-UpThe engine control module (ECM) may command the aftertreatment regeneration device (ARD) to operate shortly after the engine is started in order to increase the temperature of the DPF.The ECM checks the coolant temperature and the temperature of the DPF during the first 60 seconds immediately after the engine is started. The ECM activates the ARD if it is necessary to raise the temperature of the DPF. The ARD operates until the temperature of the DPF has risen to an acceptable value. Then, the ARD turns off. If the cooling fan is controlled by the ECM, the cooling fan is engaged while the ARD is operating.Enhanced Passive PlusEnhanced passive plus controls the soot load during long periods of engine operation at idle. Enhanced passive plus causes the ARD to operate at a low temperature for a set duration. Then, the ARD turns off. This process occurs at periodic intervals that depend on the soot load.The High Exhaust System Temperature Lamp (HEST) does not illuminate during enhanced passive plus due to the lower temperature of the exhaust.Regeneration During Power Take-Off Operation
The "Aftertreatment Regeneration Device PTO Mode Stationary Regeneration" parameter must be programmed to "ENABLED" in order for stationary regenerations to occur during PTO operation. Factory passwords are required in order to change the value of this parameter.A stationary regeneration occurs during PTO operation when all of the following conditions are met:
"Level 1" soot load or higher
Coolant temperature is greater