Passive regeneration happens automatically. Regeneration may happen one of three ways: passive, active, or forced. The built-up soot is then removed as gaseous carbon dioxide. Diesel Particulate Filter (DPF) RegenĭPF regen happens when the trapped particulates heat up enough to combust and turn to ash. We’ll discuss both of these things in more detail below. In addition to regeneration, periodic DPF cleaning is required, too. A warning light usually shows up, indicating it is time to literally burn out the accumulated soot. Burning the soot out of the filter is called regeneration.ĭPF maintenance is relatively straightforward. It needs to go somewhere and be cleared out. The filter removes a lot of the DPM-so much so, you could place a white handkerchief over the exhaust pipe and it would stay white.īut over time, soot builds up in the DPF filter walls. It’s a wall-flow filter usually made of cordierite, silicon carbide, or a ceramic monolith.Īs the exhaust gasses pass through the filter, it captures somewhere between 85%-100% of diesel particulate matter (DPM). These filters grab soot from your exhaust before it blows out into the environment. Diesel particulate filter regen is a relatively recent issue facing truck and fleet owners.īy “recent,” we mean 2007 diesel trucks from that model year and onward are “blessed” with a diesel particulate filter (DPF).
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