Diesel particulate filters

Diesel particulate filters
Diesel particulate filter is technologically designed for a certain mileage of the car. It would be approximately 100-120 thousand kilometers, depending on the car operating conditions and the recommendations of its manufacturer.

Modern cars equipped with diesel engines have pretty strict restrictions on harmful emissions into the atmosphere. That's why manufacturers provide them with special particulate filters, capable of reducing the proportion of pollution of any diesel exhaust by 30-40%, converting the soot particles into water vapor and carbon dioxide.

At the moment "wall-flow" would be the most common filters. They are made of ceramic material and structurally and technologically they are very similar to catalytic converters. Technically these filters are just blocks of several parallel channels::

But they have one fundamental difference from catalytic converters – in particulate filters soot accumulates at the very end of the channels, while catalytic converters let the exhaust gas to pass under pressure through their own porous walls.

Diesel particulate filters: design and usage

The main task of any DPF-filter is to collect soot. Over time, its channels are naturally getting clogged, and the exhaust gases have less and less space for passage, which undoubtedly causes pressure increase. So accumulated soot has to be burned in some way, which means that the particulate filter needs regeneration. And regeneration is precisely the process of removing soot from the DPF filter:

  • passively under the influence of temperature from the exhaust gases;
  • or, conversely, actively with forced high temperature in the diesel exhaust system (for example, through later fuel injection or injection during exhaust).

Modern DPF-filters are all equipped with special sensors. And first of all the pressure sensors, that are located in front of the filter and right behind it. These sensors constantly monitor the exhaust gases flow, and also calculate the amount of accumulated soot. As for the combustion process, temperature and exhaust, they are monitored by a temperature sensor and a lambda probe.

There are 2 types of particulate filters for diesel engines:

  • with catalytic converter (temperature sensor is located between two filters);
  • and without it (temperature sensor is located in front of the filter).

Any particulate filter is equipped with a number of small metal tubes with a refractory ceramic coating. Getting into the car’s filtration system, the spent diesel fuel is being cleaned of soot. And the installed DPF-filter is keeping soot particles, preventing their release into the atmosphere. At the same time, part of the diesel fuel accumulates in the engine oil, negatively affecting its protective and lubricating qualities.

Important: The diesel particulate filter is technologically designed for a certain mileage. It would be approximately 100-120 thousand kilometers, depending on the operating conditions of a particular car and the recommendations of its manufacturer. Once the resource is exhausted, the filter has to be immediately replaced. Also it has to be replaced in case of deformation or other damage.

Possible particulate filter faults and how to fix them

The fact that the filter on a diesel car has failed will be testified by:

  • excessive level of oil in the engine;
  • extraneous noise while the motor is running;
  • motor thrust reduction;
  • increase in fuel consumption;
  • heavy exhaust.

Defective particulate filters can either be replaced or cleaned. They can also be completely removed from the exhaust system (if the car owner wants to save on spare parts). But the best solution would be a complete filter replacement with mandatory disposal of the spent element.

Why utilizing particulate filter in “Exprom” LLC is advantageous?

Spent and broken soot filters can be only recycled by accordingly certified companies. These kind of car parts cannot be "just thrown away", without clogging up the environment. Therefore, the right decision will be to hand them over to "Exprom" LLC, which specializes precisely in this task. Moreover, here the filter will be evaluated by experienced experts, and the car owner will receive the maximum possible monetary reward for it. Also “Exprom” LLC has special conditions for wholesale deliverers.

Purchasing spent catalytic converters and particulate filters is the main Exprom activity. And we can offer our potential and permanent customers wishing to give away the particulate filters in Moscow, a very convenient working scheme and the best payment terms. Customers receive a high-level service, a good price, as well as a cash payment for the delivered filters directly on the day of admission.

Additionally any “Exprom” LLC client can receive:

  1. Certificate of completed analysis.
  2. Official passport-calculation and sample for independent examination.

Technologies used by the company are absolutely transparent. A recycling and disposal of all filters is carried out using the most modern profile equipment. Our customers can deliver their filters to the admission unit independently or arrange delivery (from 5 kg). In addition, the company expert will give the most detailed advice on any matter concerning the diesel particulate filter disposal.

Looking for a right place to sell the particulate filter? Call “Exprom” LLC! We are looking forward to our mutually beneficial long-term cooperation.

If you know the amount of metals in catalytic converter, you can calculate its cost


Insert the amount of Pt in grams.


Insert the amount of Pd in grams.


Insert the amount of Rh in grams.