Difference between a diesel particulate filter and a catalytic converter:

In any, even the most advanced internal combustion engine, fuel never burns completely and remains in the car's exhaust, polluting the atmosphere. The exhaust system of modern gasoline engines is equipped with a catalytic converter for gas cleaning. In its cells, catalyst metals convert harmful substances into nitrogen, carbon dioxide, and oxygen due to the high temperature of the gases themselves (400-800°C). For this, the catalytic converter is installed as close as possible to the combustion chamber.
However, the diesel exhaust system does not allow for such a scheme. The temperature in its cylinders is lower due to a different principle of mixture ignition. Moreover, diesel exhaust's main carcinogen is soot, against which the catalytic converter is powerless. In some cars, a diesel oxidation catalyst (DOC) is present and installed before the diesel particulate filter, but more often it is integrated into it.

The main difference between the DPF (diesel particulate filter) and the gasoline "catalyst" is its ability to regenerate, which is structurally embedded. DPF regeneration can be spontaneous or forced. Sensors indicate the need to burn accumulated soot: temperature and differential pressure. Two of each are installed: before and after the diesel particulate filter.
1. The factory DPF cleaning system provides two scenarios:
2. Burning by raising the gas temperature to 600-800°C ("German" variant).
Using a special fluid that causes soot to burn at standard temperatures (occurs in French cars).
Regular regeneration allows the diesel particulate filter to remain in working condition for a long time – up to 150-180 thousand kilometers of mileage. But that's in theory.

Problems with factory regeneration:

Despite the careful consideration of the process and equipment for DPF cleaning, in practice, its initiation is greatly complicated because it depends on many factors. The ECU will not initiate regeneration in cases of:
● Low fuel level in the tank;● Low temperature of exhaust gases;● Sensor malfunctions;● Malfunction (clogging) of the EGR valve.
Forced initiation of self-cleaning is also impossible by simply pressing a button and consists of artificially creating conditions for it: usually, this means driving uniformly on the highway in a low gear. Significant drawbacks of regeneration, which scare drivers, are accompanying factors: increased fuel consumption, coolant temperature rise, filter heating.

All this leads to the fact that after a certain period of time, the diesel particulate filter becomes clogged – it stops cleaning gases, and over time, it even stops letting them pass. There are three methods to solve the problem:
1. Replacement. The ideal factory method, which has only one drawback – cost.
2. DPF removal. A radical method that automatically lowers the car to lower Euro standards, which may prevent it from passing inspection.
3. DPF cleaning. Restores the system's performance without changing the engine's parameters.
Rinsing the filter is the optimal solution both in terms of operation and from an ecological point of view, but on one condition. The operation must be performed professionally, using professional equipment for cleaning diesel particulate filters.

MS900 Stand as a Solution to DPF Problems:

One of the common methods for cleaning the DPF today is washing with special fluids. This method is highly toxic and unsafe not only for the environment, where the spent composition is poured, but also for the people conducting it. The MS900 filter cleaning stand removes soot without chemicals, using only warm water. The water flow periodically changes direction and flushes the filters with pulses of compressed air. In addition to working with DPF, it can also be used as equipment for cleaning the catalytic converter.
The stand consists of three parts:● MS900A – diagnostics and drying module;● MS900B – washing module;● MS900C – washing and drying chamber.
Due to the modular design, MS900 can simultaneously wash and dry particulate filters, doubling productivity compared to conventional stands with a sequential execution of operations. For the convenience of keeping track of serviced filters, the stand stores the results of washes and can print them on an external Bluetooth printer (included).
The stand is equipped with a wide range of fittings for connecting various particulate filters for both passenger and commercial vehicles. The MS900 DPF cleaning equipment is ideal for facilitating the operation and repair of diesel cars, ensuring their compliance with modern emission standards.

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