R and M Commercial Diesel Truck Service and Repair. Located a short drive from downtown Little Rock.
Close to I-30 and I-530.
What is Diesel “Regen or Regeneration” and what does it do?
Regeneration applies to Diesel Particulate Filter equipped trucks, cars or equipment.
Regeneration is the process of removing the accumulated soot from the Diesel Particulate Filter (DPF) by increasing the temperature inside the DPF to the point where the particulates will burn up.
Diesel combustion produces soot (particulate matter). The DPF traps most of the soot which would normally be released into the atmosphere. The DPF can hold a certain amount of soot, but not a huge quantity and therefore it needs to go through a process called regeneration in order to clear the soot loading. When the soot goes through a regeneration process it is converted to a much smaller amount of ash. The ash is non-removable.
There are two types of regeneration, Passive and Active.
During long trips passive regeneration will occur. This needs no intervention from the Engine Control Unit (ECU). Due to the raised exhaust temperatures on a long journey (temperatures can reach 600 to 900 degrees° F), the procedure occurs slowly and continuously across the DPF. The soot is burned-off and is converted into a smaller amount of ash.
Active regeneration is when the soot loading in the DPF is calculated to be around 45%. The procedure lasts for about 5 – 10 minutes. Specific measures are taken by the Engine Control Unit (ECU) to raise the engine exhaust temperature to above 600°C, these include switching off the exhaust gas recirculation and increasing the fuel injection period to include a small injection after the main injection. The soot particles are oxidized at this temperature. The ECU will trigger a regeneration process, if for some reason this is aborted, ie. customer slows down, stops etc, the process will be resumed when regeneration conditions are once again met, above (40 mph).
The ECU system will try to run a regeneration process for 15 minutes. If unsuccessful, the system will repeat this process for a further 15 minutes, if still unsuccessful, the DPF light on the driver display panel will then come on.
If after 2 attempts of 15 minutes, a successful regeneration has not been possible, the loading will increase. At around 50% soot loading, the ECU will continue to maintain maximum exhaust temperatures of 1000° F to 1250° F to cause a regeneration process.
The DPF symbol lights up to indicate that the diesel particulate filter has become obstructed with soot. When the warning lamp comes on, you should drive at a constant speed of at least 40 mph for about 10 minutes.
As a result of the increase in temperature the soot in the filter should be burned off.
Understand there is a difference between DPF regeneration and DPF cleaning. At times off-board regeneration is required.
Off-board regeneration requires the truck or equiptment being at a depot or diesel garage either plugged into a wall/floor mounted regeneration station, or removing the Diesel Particulate Filter from the truck and placing in a DPF regeneration station.