Learn All About Auto Diesel Particulate Filter

This filter traps and stores soot from the exhaust (also referred to as soot traps) for reducing emissions from diesel cars. It should be noted that due to finite capacity, the soot trapped should be cleaned or burned off periodically in order to regenerate the DPF. This process of regeneration burns off the excessive soot deposited in the filter that further decreases the toxic exhaust emissions, thereby preventing the significant black smoke coming out of the diesel vehicles (especially while accelerating).

Materials used in the diesel particulate filter include ceramic materials because they have good thermal durability. The most common ceramic materials used include cordierite, silicon carbide and aluminum titanate.

Do you know everything about a DPF filter? The diesel particulate filters (DPF) are now greatly used as an effective means for overcoming increasingly severe particle emission regulations. Currently, this has been in the spotlight for the exploitation of passive regeneration of DPFs for decreasing fuel consumption following usual active regeneration. The non-flammable material or ash is extracted from the metallic additives found in the engine lubricants also collects in the DPF over time. Further, this collection of ash leads to an increase in the flow restriction and a significant rise in pressure drop throughout the DPF. Well, this growth of pressure drop negatively affects the engine performance and fuel efficiency. The connection between ash and catalyst plays a crucial role as passive regeneration is dependent on the catalyzed reaction. The procedure of passive regeneration totally relies on exhaust feed gas composition, exhaust conditions that involve temperature, flow rate, catalyst type, configuration and the state of DPF loading prior to passive regeneration. In conclusion, the main objective of this study is to tackle the long-term effects of regeneration parameters on ash depositions and its final effect of ash on the DPF catalyst performance.

Various experiments were performed that focused solely on pressure drop measurements of the diesel particulate filters with a number of regeneration methods paired along post mortem ash characterization. All this helped in providing a helpful insight into how these regeneration methods affected the DPF performance.

In the process known as DPF regeneration, the toxic diesel gases that get trapped by the diesel particulate filter are cleaned regularly. The soot accumulated is burnt off at increased temperatures resulting in an “ash-like” after product. After the regeneration of DPF, this whole cycle starts again. In all there are three types of regeneration:

1. The Active DPF Regeneration - During this, the back pressure of the exhaust or soot load of the filter is read in order to determine the time to begin the regeneration. Now that it has been started, the timing of the fuel injection tends to change resulting in increased exhaust temperatures for burning the soot particles.

While the active DPF regeneration takes place, you are likely to notice:

• Increased idle RPM/Speed
• More functioning of the cooling fan
• Falling fuel economy
• Unusual odour from exhaust
• Changes in the engine note
• Also, passive DPF regeneration

Now, once if the exhaust reaches the ideal temperature, passive will take place that involves the process where the regeneration begins automatically. The exhaust most likely achieves these temperatures mostly on prolonged highway driving. Also, the manufacturers that put to use this passive form of regeneration generally fix in an oxidizing catalytic converter that is near to the engine in order to increase the temperature.

2. A Forced DPF Regeneration - In this, active regeneration fails to take place due to soot levels that reached about 70% and above. The diesel car will mostly likely enter into the limp mode, thereby needing a diagnostic tool to actually force regeneration. The DPF will require complete cleansing/removal, if in case the car reaches 85% soot level.

Don’t know what things can actually harm your DPF? At times, your diesel car might fail to realise the harm it’s causing to the DPF. Mainly, driving into city areas ends up being a major problem leading to this problem. Well, other reasons that might trigger this problem are listed here right below:

• Short distance journeys where the engine fails to reach the ideal temperature required for operations
• Jammed EGR valve leads to a rise in the diesel soot passed to the DPF
• Increased fuel quantities being sent to the air/fuel mixture by damaged fuel injectors
• Wrong engine oil used during the servicing of the car - (low ash + low Sulphur needed for DPF cars)
• Oil leakage into the DPF leading to a failed turbo
• Increased mileage car leading difficult regeneration

It can be seen that most of the DPF installed in latest cars are likely to have a trip computer. Firstly, you will see error codes such as the DPF light or EML (engine management light) that will indicate towards problem with a failure in the DPF.

Although, you can clear these false alarms using OBD-II diagnostic tools. Well, if it continues, to show up, then you might notice the following symptoms:

• Decreased power
• Fall in the fuel economy
• Abnormally bad throttle response
• Failure in starting the vehicle
• The vehicle might enter the limp mode
• Bad odour

If you know which car parts brand suits the best for your Diesel Particulate Filter, then it would save a lot of your decision-making time. What we believe is that picking a particular brand would always be helpful in reducing the clutter, and at the same time would make it easier for the customers to find what they are actually looking for. That’s why we have listed out some top brands for Diesel Particulate Filter below as follows:

Disappointment in the diesel particulate filter arrives in a great deal of structures. Yet, observe that it's anything but a reasonable fix. In some cases, at last you may discover that there is a need of complete Diesel Particulate Filter substitution. There is no quick and hard number with respect to what amount would a Diesel Particulate Filter substitution would cost as it relies on a ton of components like the brand, make, model just as the specialist who is going to fix/replace it. Yes, diesel particulate filters can at times be very expensive. Cost of a new one can range from £1,000 to £3,500.

Don’t know how to go about changing the diesel particulate filter? Don’t worry, Parts Avatar has all the information you need. The diesel particulate filter on the car can confuse you for being an exhaust silencer. You can locate it closer to the engine where it is warm. The PDF will heat up faster and burn off the soot particles easily with the help of the heat provided from the engine. If in case the DPF warning lights are illuminated, make use a cleaner to clear any blockages first as this procedure might solve the problem and is very cheap.

If the cleansing fails to work, then a replacement of the DPF should be performed. Purchase a new DPF filter from Parts Avatar, if you want to install if by yourself keeping the expenditure minimum. Here is a guide that’ll help you replace your DPF:

Step 1 - You Need To Jack Up Your Car

Firstly, park the car on a clear flat surface. Make use of the jacks to raise all four wheels the car off the ground. You will find the DPF under the car (you won’t be able to reach it using the sideways of the vehicle). Lie down right under the middle of the car in order to fully access it. Be cautious with all the preventions as this might take a lot of time.

Step 2 - Find The DPF

Well, note that DPFs often vary in size, shape and color but generally contains a broad section of exhaust tube that is mounted close to the engine, under the car.

Step 3 - The Bolts And Screws Should Be Removed

Be careful while observing the position of the DPF so that you can fit in the new one correctly. Ensure that you remove all of the screws and bolts that fix the DPF right in place and secure them. Also, you won’t be required to change the filter from its heat guards as the new filter will have heat shields of its own. This will make the process of removal easy (take it off in one piece).

Step 4 - Fix In The New Filter

Take time while performing the fittings of the bolts and screws while fitting the new DPF in exactly the same position as the old one. All the nuts and screws and washers which came off the original filter should be removed.

Step 5 - Check That It’s Safely And Properly Done

Test well to see if you have tightened and fixed the DPF right in place to avoid leakages in the exhaust system as a slightly loose fitting between various sections of pipe can lead to major problems like low pressure and more fuel consumption.

Step 6 - Lower Down The Car

It is essential to clear the area underneath the car. Remove any tools that might have been used while removing and replacing the DPF. Lastly, lower the jacks slowly so that the car is put down again.

Step 7 - Test To See This Works

You can take a drive for a short while (prefer quiet, open roads where you can speed up). Then wait to see if the warning light goes off. If in case, any other warning lights illuminate, or if you notice something wrong with the car, stop the engine and take the car back again to figure out the problem. Carefully check any dislodging’s that might have happened while fixing the DPF. If nothing happens, rejoice as your replacement has been done.

Step 8 - Maintenance

We advise you to use a DPF cleaner regularly to ensure that this new filter lasts longer and works efficiently.