cars with Euro 5 Diesel will be equipped with additional catalysts clean. This is a practical test of the ADAC. Before such systems are ready for series production, could have been the Problem but it is largely done.
comment by Joachim Becker
Can be dirty Diesel clean? A field test of the ADAC shows that Retrofitted SCR catalysts to work even after 50 000 kilometers, reliable. With the built-in for several Thousand euros of three test vehicles achieved the nitrogen oxide(NOx) limit of 270 milligrams per kilometre (mg/km). This Limit was named last autumn as an upgrade target in the Federal Immission control act. In spite of the NOx-reduction rates of 50 to 70 percent, many questions remain open. Because the systems work best if the engines emit the least NOx: at a comfortable room temperature.
it was a Different picture in the case of the German average temperature: ten degrees Celsius, the auto-ignition continued to be a dirty fling: Despite the active SCR catalyst, the emissions were at a minimum of 400 mg/km. Even worse, it was in the winter at less than five degrees. Then the VW T5 Multivan 1900 mg/km uttered, for example, in an SCR operation, there were 1200 mg/km. The Limit of 180 mg/km for Euro 5 diesel models was the first to be exceeded more than ten times. No wonder that the retrofitted flue gas scrubbing could not create pure air.
New laws are to driving bans for Diesel in many places
to prevent problems, the significant prepared more consumption of the tested prototypes. According to the Directive, the fuel consumption may increase by a maximum of six percent, otherwise the approval expires. With values between seven and 13 percent, all three vehicles were in part significantly above the Limit. In everyday life, test some of the constructive weaknesses of the prototype were identified: Mechanical failures, temporary system failures, and a temporarily overloaded power supply. Conclusion of the transport clubs: The defects “require on the way to the further development of Mature work of the Retrofit.” In clear text this means: Feasible, such systems are already, but they are not yet Mature. Especially since only three vehicles were tested, and the adaptation show up in other models to further weaken.
a series of development usually include extensive coverage of trips under all environmental conditions. Depending on the size of the test fleet, they usually take several months to complete. The promise of the rebuilder, the first systems up to the middle of the year to finish, so keep. The systems to be late, especially since the Bundestag has just adopted new diesel laws: driving bans are supposed to be “the rule” disproportionately, if the pollution with nitrogen oxides annual mean 50 micrograms per cubic meter of air does not exceed. This softening of the EU limit value of 40 microgram of power, large driving bans for diesel Tinker is extremely unlikely.
most of The municipalities are now going to try with clean air plans and many of the detailed measures to reach the annual average of 50 micro grams. In addition, the renewal of the vehicle fleet is progressing. We also take into account the announced relaxed controls, then the Hardware retrofitting older diesel models for the majority of vehicle owners interesting.
