EGR – filter-based purity. In EGR technology, a proportion of
the engine exhaust emissions is mixed with fresh air drawn in
separately, reducing the speed of engine combustion and the
temperatures generated. This technology largely eliminates the
accumulation of nitrogen oxides. Soot thresholds, however, can
be met only with the aid of a particulate filter (DPF). The
advantage of EGR is that no second tank or additional resources
are required. *DPF is an abbreviation for diesel particulate
filter. These filters are designed to reduce exhaust particles,
but are more complex than catalytic converters. This is because
one function of the particulate filter is to routinely recombust
accumulated soot (regeneration), something which requires
additional technology.