The diesel particulate filters (DPF) or soot traps or soot filters are placed in the exhaust pipe. The filters collect soot particles that exist naturally , preventing their release into the atmosphere by keeping the air we breathe clean. The traps soot retain very effectively the soot and the particulate matter resulting from the combustion of diesel and then they oxidize them. The mean particle removal through oxidation is called regeneration. The regeneration of the filter should not be perceived by the driver and take place without his intervention .
The modern filters have very high efficiency (over 95%) and good mechanical and thermal resistance . Generally, the requirements of the construction material of the filter are very demanding. They must be resistant to high temperatures (above 1000 ° C), and sudden changes in temperature. Still, they should have good mechanical strength and durability in the environment of the exhaust gas (oxidizing gases , ash derived from the catalytic fuel additives and lubricants). Furthermore , the filter should have low pressure drop, high catalytic coating ability, small size and weight , low cost, high degree of retention of particles , and a capacity retention of a large amount of soot.
The right choice in the placement , maintenance and filter replacement smoke in a vehicle is the responsibility of all of us, as it helps us to breathe cleaner air and protect the environment.
