How does DPF regeneration occur? The regeneration occurs automatically, usually without the driver being aware that it is taking place. In the majority of cases, the process is carried out when the engine and exhaust system has reached normal operating temperature and the vehicle is travelling at over 40mph.
A forced DPF regen will make sure there is no soot buildup in the DPF / SCR System. Making sure to do this more than once could extend the life of your DPF system. We advise performing a service DPF regeneration once per month. Because your filters are clean and your exhaust is moving air more effectively, you might experience better MPG.
Because the DPF is under the car, not ‘close coupled’ in the exhaust manifold, the car needs to be driven quite a long way (50 miles) at 2000 – 2500 rpm to get the DPF hot enough to promote a passive regeneration.
The regeneration process ‘cleanly’ burns off the particulates/soot with a DPF able to reduce particulate emissions by around 80% compared with your diesel-powered vehicle not having one. In some cases, the regeneration process may not occur or may be interrupted . by certain operating conditions such as low speed, prolonged idling and engine stop / start, etc. 1: PM (soot) threshold met. 2: DPF regeneration. 3: Clean DPF. If the process does not occur or is interrupted, the ECM is programmed to . recommence the regeneration OK - Daft question, but how is my DPF ever going to regenerate. I read everywhere that I need to go for a good 30 minute run at above 2500 RPM, however, to do this in a 330d Auto you need to be tanking it at 90 MPH. That can't be right - do I need to lock it in 4th and do a 30 min run? Not easy on Cornish roads! Passive DPF regeneration: Passive DPF regeneration occurs naturally during normal driving conditions when the temperature of the exhaust gas is high enough to burn off the particulate matter. However, this process is not always effective, especially for vehicles that are used for short trips or in cold weather conditions. Active DPF regeneration:
Active particulate filter regeneration. Because drivers often do not drive on motorways or high-speed roads, manufacturers came up with the idea of active regeneration. The active regeneration of the particulate filter occurs when the soot level in the DPF is around 40-45 % of its capacity.
During most vehicles’ engine cycle, active regeneration occurs approximately every 300 miles and takes 5 to 10 minutes, this however will depend on your particular driving style during this period. Common factors that occur during active regeneration. The engine sounds louder and has a faster idle speed. Your fuel consumption increases. OebjpP.
