The information that follows is general. It will be spoken only of the two most common types of filters additive & catalyst. Here are some FAQ discussed in order to clarify some frequently asked questions.
1) What is a diesel particulate filter?
It is a mounted element in the exhaust line, which prevents the exit of the particulates contained in the exhaust gases. It reduces particulate emissions to levels below the limit imposed by the anti-pollution regulations. This equipment is unique to diesel vehicles.
2) How is the diesel particulate filter work?
- Phase 1: Filtering – This phase consists of particles accumulate in the filter itself
- Phase 2: Removal of particles – This phase occurs in the regeneration phase. It is a periodical operation, automatic and transparent to the driver. Simply consists in burning at high temperatures the particles were accumulated.
3) How is the regeneration of FAP?
Regularly and without any driver intervention, the accumulated particles are incinerated, it is the phenomenon of regeneration. To regenerate (ash particles) FAP temperature is high, as in a furnace. The regeneration is carried out independently for each 500km in driving on the road or 50 km in city driving (these values may vary!) It is completely transparent to the client. However, during the first regeneration, an odor and white smoke, both did not harmful, may arise.
In many vehicles, if there were no appropriate conditions for the autonomous regeneration, a warning light or a message may appear appears in the instrument panel, to urge the driver to provide the driving conditions necessary for autonomous regeneration.
4) Under what circumstances regeneration is interrupted?
- After occur the maximum (typically 25 minutes), unless the filter is unobstructed.
- If the engine is turned off or goes down
- If the engine is left idle for a long time (5-10 minutes)
- If EGT‘s are detected too high (1000 ° C)
- If during regeneration a fault in one of the components relevant to combustion is detected.
5) How long does the healing process?
Typically takes about 5 to 10 minutes in case when driving on ordinary roads, there Gastes the temperature required for regeneration. In conductions not ideal for example, in prolonged decreases in that there is an optimum temperature, the regeneration period can take up to 25 minutes.
6) What driving adopt, as prolonged use of the vehicle for low speed prevents autonomous regeneration?
– Typically, after the warning appears on the instrument panel, the driver has 100km to activate regeneration. It is then necessary to move at a speed of 60 km/h in minimal (in accordance with the vehicle) so that the regeneration is effected and off the alert.
Note 1: The speed required for regeneration was initially of 80 km/h. Currently is 60Km/h and there are already some cars that manage to make it to 40 km/h.
Note2: Once regeneration starts, the speed may drop below the suggested threshold promptly, without thereby interrupt the process such as relaxation for collecting the toll ticket.
7) What happens if it is not carried out the regeneration of FAP?
– The FAP continues the filling process, now functioning as a stopper in the exhaust line. The vehicle’s performances are strongly affected.
8) What is a forced regeneration?
– This is a regeneration factory FAP under specified conditions.
9) Is it true that during the forced regeneration carried out in the workshop engine oil loses its properties and must be changed?
In certain cars as (e.g., PSA’s) during the forced regeneration, oil is degraded by diluting diesel, necessitating replacement of the same. The car has sensors that detect the quality of oil and if replacement is necessary, turn on the light “INSP” on the dashboard. If the oil is not replaced may damage the engine.
12) What happens as the FAP collects waste?
45% – Normal Regeneration
50% – regeneration at maximum predetermined temperature
55% – Turns the warning light on the instrument panel and regeneration will be made from the minimum preset speed.
75% – Turns the warning light is activated the torque reduction and disabled the EGR
95% – should be changed FAP
13) Can we put together a particulate filter in After Sales?
Yes, there are countries/states where it is required. Example: California. However, typically the assembly of FAP in spades Sales, does not have the same effectiveness.