Clean diesels are a new group of diesels made up of a three part structure which combines cleaner low Sulphur diesel fuel, unconventional engines and effective emissions control technology. Clean diesels are used on a large scale for transport. They are also used to power various equipment in the mining, construction, and agriculture sectors. Clean diesels are cleaner, more fuel efficient and offer more torque than other fuels. The clean diesel market however faces major competition from its gasoline, hybrid, and electrical counterparts.
Low diesel prices, government subsidies, stricter environmental regulations are major drivers for the clean diesel market. Clean diesels though are known to produce nitrous oxide. The use of advanced emission control technologies are helping the clean diesel market cope with this problem. One of the most notable downsides however to diesel engines is that they tend to cost more than gasoline engines.
Common Rail systems supply high injection pressures available at an accumulator directly to the injector thus providing better control, emission reduction, and better efficiency. There are two ULSD standards available, Grade No. 1-D S15 which is a highly unstable fuel with an inferior gelling temperature than regular ULSD and Grade No. 2-D S15 which is regular ULSD. Companies such as Clean diesel Technologies (CDTI) develop catalyst technologies and emissions control systems to meet the requirements of increasingly stringent environmental regulations and decrease emissions.
The state-subsidized incorporation of vehicles by means of tax concessions led to a significant increase in the proportion of diesel engines in privately owned vehicles in Europe. Approximately 50 % cars in Europe run on ULSD. Europe has been the frontrunner on regulations for low-sulfur, “clean” transportation fuels. The use of ULSD since a long time combined with the presence of major car manufactures in Europe will lead to the technological advancement of the clean diesel market.
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