Before answering the question of how to cancel the diesel particulate filter (DPF), it is necessary to give details about the particulate filter so that the page can be understood. For this reason, in this page, besides the principle of operation of the particulate filter, you will be able to find the answer to questions such as why and what is its cost.
What is Diesel Particulate Filter (DPF)?
DPF, Diesel particulate filter is part of engine exhaust systems used to reduce exhaust emission values. Diesel particulate filter is found in some of Euro 4, Euro 5 and Euro 6 cars in accordance with emission standards. Diesel particulate filter, as a principle of operation, holds and traps particles that are harmful to the environment. Due to the particles trapped in the particle filter, the filter fills after a while. If this amount increases, the diesel particulate filter may be clogged. Diesel particle filter pressure sensors measure the amount of particles in the filter and regeneration starts if a high soot level is detected. That is, the diesel particle filter starts cleaning.
When the particles accumulated in the Diesel Particulate filter exceed certain limits, they must be burned and cleaned. In some cases, regeneration may not take place. If the particle filter is filled with soot, warning messages such as the warning lamp or the Diesel Particulate Filter will continue to be filled. You can look under the heading of the particle filter cleaning methods described below although we do not recommend what to do when such a warning is received.
This filter, which is disposable in some brands, changes, in some systems, the particles inside the filter are burned out and this means that the filter cleans itself. To do this cleaning, it includes a sensor and a syringe such as afterburner. Sensing that the filter is full, the sensor sends a warning message on the screen and gives the message that the combustion has started. The driver, who sees this message, must be driving for a period of 20-30 minutes, without falling idle and at a slightly higher speed, the vehicle should not drop, stop and stop until the message is cleared.
Why Diesel Particulate Filter (DPF) Is Clogged?
- Low quality fuel,
- Bad burning due to failures in the fuel or air system,
- Long-term driving in low speed and heavy traffic,
- Running the vehicle at idle for a long time,
- Burning of the engine after using the wrong oil
Should I Have Particulate Filter Cancellation?
You can try cleaning methods before considering particle filter cancellation. But these will be a work around and you will soon encounter the same failures. Therefore, our recommendation will be to either replace the filter with a new one or have it canceled. However, for those who are curious, the cleaning methods are described below. If the problem recurs after performing the cleaning methods respectively, either the filter will need to be renewed or it will need to be cancelled in software. The cancellation method stands out as the cost is too high for filter replacement. The particle filter cancellation process consists of two stages. The first one is the mechanical process and the second one is the software process.
Mechanical process: A cover is opened on the diesel particulate filter and the filter is emptied. In order to prevent sound inside the filter, honeycomb-shaped pieces are welded and the opened cover is closed.
Software Process: The filter to be done after mechanical cancellation of the filter is to cancel the filter together with the software. The software in the engine control unit is read to the computer and the DPF maps in the software are found and the maps are canceled. The cancellation process is completed by writing the updated software on the engine control unit again.
We prepare particulate filter cancellation files on our website online. You can get detailed information about our file services by contacting us. For detailed information, please see our System Cancellation File Service page. You can find the current price of DPF cancellation on our price list page.
Is there any problem in emission values after particle filter cancellation?
The question of whether there is a problem in emission values after particulate filter cancellation is one of the most frequently asked questions.
For systems that are separate units with the catalyst; the cancellation of the diesel particulate filter does not significantly affect the emission values. Since the string particle filter has only soot properties, it does not disturb the emission measurement values. If your vehicle has no problem in air and fuel systems, your exhaust emission values will be good.
For systems with a single unit with catalyst; the cancellation of the diesel particulate filter will increase the emission values. Because its catalyst needs to be emptied. Therefore, emission values increase somewhat.
How To Clean Diesel Particulate Filter?
Diesel particulate filter cleaning process is carried out by 3 different methods. DPF cleaning methods
I – Self Cleaning of Diesel Particulate Filter
When you drive the car at high speed on the long road, the exhaust gas temperature will increase. So the particles in the filter will be burned out by itself. The important point here is not high speed, but high engine speed. Therefore, if you want to clean the diesel particulate filter while driving, you can drive for a while at high engine speed. In other words, you have to drive the vehicle for over 2500 rpm.
II – Diesel Particulate Filter Cleaning Process on the Road by Engine Control Unit (ECU)
When the diesel particle filter is full, the engine control unit (ECU) performs particle filter cleaning by changing the injection quantities with a special process.
The engine control unit ECU rearranges the injection system according to the regeneration mode of the particle filter. The ECU delays (delays) the preliminary injection and the main injection, and makes an additional 3rd post injection. Sub-injection is performed by spraying a small amount of diesel while the piston moves from the top dead center (TDC) to the bottom dead center (BDC) during work.
During the cleaning mode, the EGR system, which lowers the combustion temperature, is disabled. sends more fuel and increases the exhaust temperature. When the exhaust temperature reaches about 600 ° C, regeneration process begins and solid particles are burned and converted to drying. In some cases, this process may not work as well. The vehicle’s DPF or Engine Malfunction Lamp will not go out and the vehicle will lose power. In such a case, the vehicle should be taken to the service and regeneration should be done with the help of the fault detection device.
III – Cleaning Process by Connecting to Computer in Workshop
When the car is checked by workshop due to the particle filter malfunction lamp lit or the particle filter is full-clogged, a computerized cleaning process is carried out with the obd device. This process takes about half an hour. Some companies recommend changing the engine oil at the end of this process. Under computer control, the engine speed is increased and it is operated at high speed, the exhaust line will get very hot in this process. In some services, diesel particulate cleaner spray is also used for cleaning. The temperature sensor is removed and sprayed from there. Awaiting for half an hour, and then cleaning the computer with a diesel particulate filter.
As we said above, our advice for those considering the cleaning method will be that they do not. They are likely to fail again soon. Therefore, there will be unnecessary money expenditure.
Ref: Carstechnic and BTP Online Garage