Particulate Filters - Everything that You Need to Know!

Particulate filters help stop harmful emissions like ash and soot from the exhaust gas going into the atmosphere. The recent rise in pollution levels and the call for cleaner energy for cars have led to these filters being necessary.

Did you know, a DPF can last for around 100,000 miles if they are maintained properly. However, cleaning these filters can cost a fortune.

Diesel Particulate Filter

DPF is made of ceramic and is in the shape of honeycombs. These filters capture and store the soot coming from the exhaust. These particles must be burned off in regular intervals. The regeneration process burns off the excess particulates, preventing black smoke and harmful emissions from diesel cars. Soot is typically made out of carbon; this is converted to carbon dioxide before release. The removal of the filter removes the ash. A machine with compressed air is used for this purpose.

Petrol Particulate Filter

The PPF is similar to DPF. The interesting fact here is that the soot and ash from the exhaust are far less in the case of petrol cars. So, it is much easier to burn off particulate matter and reduce harmful emissions. This is one of the reasons why petrol cars are much better than diesel cars. However, it must be noted that low-sulfur petrol must be used for the filters to work properly.

What can cause filter blockages

There are a few reasons why these blockages can happen. Firstly, traveling shorter distances at low speeds does not provide the regeneration needed to burn off the soot, which can cause a blockage. Secondly, improper maintenance can lead to blockages since you should regularly get these filters checked. Thirdly, modifications or improper oil usage can also cause blockages.

How do you know when the PF is blocked?

Your car dashboard will display an orange light/symbol, indicating if the filter is blocked and needs to be cleaned.

Cleaning of Particulate Filters

There are mainly two methods for the cleaning of particulate filters:

You have the thermal method, often called the “bake and blow” method, where the filter is placed into an oven which oxidizes the soot. This process uses air to push out the ash coming from the exhaust.

The second process is the aqueous method, which uses “surfactants.” These surround the soot, making it easier for water to clean it. Then, the filter is placed in a special drying cabinet. This is then reinstalled into the car after two hours which all the equipment and checks are thoroughly completed!

Clean filters translate into a smooth riding experience for you and lesser stress on the engine. So, always ensure timely cleaning and servicing of the filters to extend the life of your beloved car.