Black smoke: unlikely to happen with your semi-truck, right? That’s all thanks to your DPF filter.
You can thank your truck’s DPF filter for clean diesel fuel burns and a cleaner exhaust system. But what is a DPF on a truck, and why is it important?
A diesel particulate filter system, also known as a DPF system, reduces harmful emissions and soot from semi-trucks by capturing soot particles and removing them from the exhaust before the fuel exits the exhaust tail pipe. The result is a more fuel-efficient vehicle.
But the benefits of a DPF system don’t stop there. Wondering what else a DPF system can do for your truck?
Come along for the ride as we explore what’s included in a DPF system, signs that indicate you have a blocked DPF system, the parts of a DPF system, and why DPF system regeneration is crucial to a healthy and clean semi-truck operation.
What a diesel particulate filter is and does
We now know that a diesel particulate filter is crucial in reducing emissions from diesel vehicles by trapping soot, ash, and other particulate matter before storing said particles and burning off the excess soot in a process called regeneration.
In other words, regeneration converts soot into carbon dioxide, thereby preventing harmful emissions and preserving the health of a truck by keeping the engine more fuel-efficient. The DPF helps recycle soot that’s caught in the DPF system, and the soot is then reused for fuel.
So, what’s involved in regeneration?
All about DPF system regeneration
Since regeneration makes up a large part of the DPF system’s efficiency, we figured we’d spend some time talking through it. Regeneration works by raising the temperature of the exhaust high enough so that excess soot burns off.
The regeneration process goes as follows:
- Emissions are caught in a very fine ceramic-like filter called the diesel particulate filter (DPF).
- After some time driving on the road, the filter will fill up with particulate matter.
- Then, through the addition of burning and oxidizing the particulate matter, the particulate matter is removed and turned into carbon dioxide and water.
In other words, when the diesel particulate filter is clogged with soot, the DPF system will regenerate itself as you’re driving to increase fuel efficiency.
Two types of regeneration exist:
- Passive regeneration
- Active regeneration
Passive regeneration occurs on long drives. The reason is that the engine temperature is high enough for soot to burn off on its own. Passive regeneration occurs when you maintain steady highway speeds for 45 minutes or more.
In contrast, active regeneration is for short drives. With active regeneration, you might not be on the road long enough for your engine to heat up and for passive regeneration to occur.
For these shorter drives, your truck’s DPF system will inject excess fuel to raise the exhaust temperature in your vehicle and therefore trigger a more “active” process of regeneration (hence the name “active regeneration”).
By being aware of all the parts of the system, you can avoid blockages that can prevent your DPF from malfunctioning. We’ll take a look at the different parts of the DPF system next to help you avoid signs of blocked DPFs.
5 Signs of a blocked DPF
|
The parts (and repairs) of a DPF system explained
If you think there’s a blockage or an issue with your DPF system, we’ve got the DPF system broken down for you. Diesel particulate filter systems include the following key components:
- The diesel particulate filter
- Diesel oxidation catalyst (DOC) filter
- Fuel dosing injector
- The control module
- DPF pressure differential sensors
- Multiple exhaust gas temperature sensors
- The EGR system (not to be confused with EGR deletes)
- The vehicle’s turbocharger
If you sense there’s an issue with your fuel or DPF system, you’ll know if a warning light stays on after the DPF system regeneration process. If the warning light stays on, you may need to bring your truck in for immediate diesel repair service for a process called forced regeneration.
Forced regeneration involves using a diagnostic scan tool to start the regeneration process. The reason is that the DPF soot load may be so high that passive and active regeneration can’t occur and therefore forced regeneration is needed.
Forced regeneration can help restore the DPF system’s ability to regenerate. You can stop by your local diesel truck repair shop for the tools needed to start forced regeneration.
Better yet, your local diesel repair team can help you do it themselves. Before you make your way to a diesel truck repair shop, consider removing the DPF filter and cleaning it in a compressed air machine to remove excess ash that may have arisen from the regeneration burn process.
Certified trucking fact #3: Fuel efficiency starts with filter maintenance
⛽ Don’t just drive — drive smart.
Did you know the five ways to ensure a more fuel-efficient truck? One of those checks starts by monitoring your fuel filters, and you guessed it, the diesel particulate filter is one of the key filters in a more fuel-efficient vehicle.
Here are five areas of your vehicle to check for a more fuel-efficient vehicle.
- Check fuel caps
- Inspect for leaks
- Monitor fuel filters
- Track miles-per-gallon (MPG)
- Avoid over-idling
Fuel efficiency starts with proper maintenance. When’s the last time you had your truck checked?
For more details about what to check on each of the five areas listed above, check out our post on IG.👈🏼
Choose Certified experts for your next DPF system upgrade
The average fuel economy for a Class 8 truck is 5.7 miles per gallon, according to the U.S. Department of Energy (2024). When you’re hauling thousands of pounds of precious cargo, you can’t afford your DPF filter system to be any less fuel-efficient, given how few miles per gallon your truck gets.
If you’re hoping to increase your mileage per gallon — or if you’re looking to fix a faulty diesel particulate filter (DPF) system — we can help.
The ASE-certified diesel repair technicians at Certified Fleet Services have more than 25 years of dedicated experience working with diesel-powered trucks, vehicles, and equipment. Bring your truck into one of our three, convenient Florida-based locations, or call us for swift, seamless mobile truck repairs.
That’s right: we’ll come to you.
For more information about our repair team, to schedule truck service, or to ask any questions about DPF filters, our team is ready to help with all your diesel engine maintenance needs. Contact us today for immediate support.
We look forward to being of service.
Certified Fleet Services: Let’s Get You Up and Running Faster
