DPF cleaning - methods and features

One of the most relevant procedures required by modern diesel vehicles is cleaning the unit in stationary conditions at a service station. Only in this way can DPF functionality be effectively and relatively inexpensively restored. A well-performed procedure can be considered a viable alternative to replacement, which is still too expensive to solve the DPF problem. Removing the DPF is also not a solution. The vehicle will have to be reprogrammed to Euro-2 standards, which, besides polluting the atmosphere, poses problems with technical inspections.
There are several methods for cleaning the diesel particulate filter:
● Chemical● Thermal● Ultrasonic● Pneumatic● Hydraulic
The most popular method is to pour highly active chemicals into the filter. Often, in this case, the exhaust system is not disassembled, and the solution enters inside through a sensor hole. The method is quite effective but extremely environmentally unfriendly and hazardous.
Other methods also have their drawbacks. Ultrasonic cleaning is expensive, and it is difficult to remove soot from the unit under the influence of temperature. The use of air and water is much more effective. The combination of these methods is precisely the principle of operation of our equipment for cleaning particulate filters.

MS900 stand, its main properties, and characteristics

The main feature of our stand for cleaning particulate filters is the use of only warm water as a cleaning liquid, circulated in a closed loop. By changing the direction of the flow and additionally enhancing it with compressed air pulses, the device achieves cleanliness similar to that of a new unit.
Another advantage of the MS900 is its versatility. By using fittings of various sizes, different filters can be cleaned, both for passenger cars and commercial vehicles, after removing them from the vehicle's exhaust system. Since the cleaning process is automatic, the operator controlling the DPF cleaning equipment can perform several tasks simultaneously.
The stand consists of three parts:
● MS900A - diagnostics and drying module● MS900B - cleaning module● MS900C - washing and drying chamber
Modules A and B can work autonomously from each other, and two modules C can be installed to increase the number of serviced filters. The functions of the stand are not limited to DPF cleaning - it is also used as equipment for cleaning gasoline engine catalysts.

Stages of stand operation

Cleaning diesel particulate filters using the MS900 takes place in four stages:
● Testing● Cleaning● Drying● Re-testing (final testing)
Before starting work with the filter, it is checked for the presence of motor oil residues in the cells, visually or using an endoscope. If they are present, the unit will need to be placed in an alkaline solution for several hours and then rinsed. If there is no oil, the particulate filter can be immediately placed in the stand.
The first stage begins with the installation of fittings of the required diameter on the filter and connecting a hose to them. Compressed air will be supplied through them to determine the DPF resistance. The unit should be connected to the hole that is the entrance in the vehicle's exhaust system.
The check lasts up to 1 minute, the result is displayed on the screen, and it can also be printed on a Bluetooth printer. If the resistance is higher than 120-160 mBar, you need to move on to the washing stage.
For this, the filter is already connected to two hoses. The connection order is not important. In the menu of the MS900 B module, you need to select the appropriate parameters and start the washing by pressing the Start button. It lasts 20-30 minutes and ends.
The next stage is drying the filter. During this process, the hose is also connected only from one side of the filter. It takes 15 minutes. During this process, a graph (diagram) of the filter resistance change is displayed on the stand's display. Once the graph is leveled, you can proceed to the final part.The last stage of cleaning is the final diagnosis. A well-cleaned diesel particulate filter should have a difference from the initial data of at least 30 mBar for passenger car units and 60 mBar for commercial transport units.
The equipment for cleaning diesel particulate filters, the MS900 stand, provides a unique opportunity to restore the operability of all types of diesel filters - DPF, FAP, GPF, and gasoline catalysts. The vehicle retains all its powerful characteristics while complying with emission standards and modern norms.

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