Diesel : clean ?
Why must diesel fuel tanks comply with pollution standards ?
Eliminatig NOx emitted during the combustion of diesel fuel by diesel cars is a difficult process that concerns automakers. Indeed, compliance with environmental regulations in the country where their diesel models are commercialised is a recurring issue. Since 2012, the diesel exhaust gases are classified as “carcinogenic” by the WHO.
What do manufacturers do to comply with the regulation on diesel?
Mercedes-Benz models were the first to use a technology based on the use of AdBlue® to eliminate harmful particles (NOx) at the output of the engine. This technology, called Bluetec, does not affect the diesel consumption or the power of the engine, but it requires a separate AdBlue® tank; A reservoir that must be filled periodically.
Volkswagen has invested millions to develop a NOx trap instead. The trap absorbs nitrous oxide and nitrogen dioxide like a sponge. Once the trap is full, the system can inject a dose of fuel before exhaust gases are released. The reaction between the fuel and the NOx gives rise to non-polluting substances.
With the hardening of the standard, a large majority of manufacturers have begun to use AdBlue® in order to feed the SCR system which is proven to be the most efficient solution in terms of the reduction of nitrogen oxides.