Diesel Particle Filters

Diesel Particle Filters: How it Works

Diesel particle filter is designed to eliminate almost all small particles from the exhaust then burns them by combustion. There is a catalyst layer in these diesel particle filters which allows regeneration without the use of fuel additives, ensuing better performance. More pressure as well as temperature in the exhaust, effective software enhancements in the engine and the valve in the inlet system work together to make filter regeneration function efficiently when the car is being driven.

Diesel particle filter aims to continuously eliminate diesel particles form the engine without affecting fuel efficiency. Requirement set forth in exhaust standards were achieved by installation of the right diesel particle filter, and there are no other requirements for additional upkeep need by other systems that utilizes additives.

In March 2004, it was BMW that pioneered the installation of particulate reduction systems that paved way to the creation of diesel particle filters as standard for the BMW 5 series. At present, the technology is installed in all BMW diesel vehicles.  This technology makes sure that the requirements of EU exhaust standards are met without the need to add maintenance or increase fuel consumption.

Like other mechanical systems, the diesel particle filters are also prone to wear and tear. Avoid the damage to the diesel particle filters by checking the soot loading and the filter regeneration must be as necessary. Today, different advancements are used by commercial vehicles to make keep the engines clean and functional.

Continuous Regenerating Trap: With this technology, the soot is burnt through the use of nitrogen dioxide which comes from nitric oxide and oxygen in an oxidation catalyst. This combustion happens in slowly yet continuously. For this kind of passive regeneration it is required that the car should always be operated above a certain temperature range.

Active Regeneration: The temperature of the vehicle exhaust should fall below 250°C.  Here, passive CRT will not work and active regen procedures are utilized. Diesel fuel will be put directly into the exhaust system and converted through an oxidation catalyst or will be combusted directly.

Cordierite Wall-Flow: The most popular among diesel particle filters. These are created from cordierite which is a ceramic substance that is also used to make the catalytic converter cores.  This kind of diesel particle filters gives outstanding filtration efficiency, and is generally cheap, and has thermal features that make their installation to different types of vehicle easy.

The only setback is that cordierite uses a low melting point and cordierite substrates are known to break down during regeneration. This usually happens when the filter has become blocked more seriously. Cordiete cores are similar to catalytic converters with plugged channels and these plugs are those that push gas from the exhaust to through the walls as well as those reside which have accumulated in the inlet.


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