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What is DPF and why is this filter for particulate important

03.4.2023

If you own a car, you have probably heard of the DPF or diesel particulate filter. The DPF is a device that is installed in the exhaust system of cars and aims to reduce the amount of particulate matter (soot) emitted into the atmosphere. Soot particles are microscopic particles that can cause a range of health problems such as asthma, lung cancer, and cardiovascular diseases. That's why it's important to keep the DPF in good condition.

 

The particulate filter works on the principle of the catalyst, passing gases through a porous structure that traps solid particles. However, over time, the filter becomes clogged with these particles and needs to be cleaned or regenerated. DPF regeneration can be passive or active. Passive regeneration occurs automatically when the temperature of the exhaust gases reaches around 600 degrees Celsius. Then the soot begins to burn and is converted into harmless hydrogen oxide and carbon dioxide. However, in order for passive regeneration to occur, you need to drive the car at higher speeds and revs for longer periods of time, such as on highways or mountain roads. Active regeneration occurs when the car's computer detects that the DPF is blocked to a certain extent. Then the computer controls the engine to increase the temperature of the exhaust gases and injects additional fuel into the exhaust system. This helps to burn off the soot and clean the DPF. Active regeneration can also occur during city driving, but you need to allow the process to complete by not stopping or turning off the engine.

 

To function the DPF properly, some conditions should be met, such as:

  • Avoid frequent driving over short distances or at low engine speeds, as this does not allow the filter to heat up enough for regeneration to begin.
  • Use high-quality diesel fuel and oil that do not contain too much sulfur and other impurities that increase the formation of solid particles.
  • Monitor the indicators on the onboard computer that show the status of the DPF and the need for regeneration. If the DPF warning light comes on, continue driving at high engine speeds (around 2500-3000 rpm) for about 20-30 minutes or until the indicator goes off. If this does not help or if the red DPF indicator comes on, seek service immediately.
  • Avoid modifying or removing the DPF, as this is illegal and may result in fines, loss of warranty, or damage to the engine.

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