IAA visitor with clean diesel?
For the first time in a major scandal involving an automaker, the software is brought into focus. Customers, professionals, communicators of the car world appear disoriented. The sensational recalls for defective cars circled far to mechanical issues, lack of driving stability in avoidance maneuvers of the “elk test”, frayed cables or fuel lines, or in the United States recently to faulty airbags or ignition locks.
Author:. Tobias Piller, economics correspondent for Italy and Greece, with headquarters in Rome
Now, if in scandal involving Volkswagen provides software for the engine control at the center, the new top management can make it the hope that can be solved without major mechanical changes a part of the problem. It is through an updated program.
More and more design freedom
At the same time this scandal also revealed to the engineered software program but that in this manipulation likely intent must have been in the game. Modern technology allows the development engineers increasingly to prioritize performance and engine characteristics. Unless you need while maintaining high performance mechanics on something or on a piece of pulling power, comes more easily to good emission and consumption figures.
A developer who wants to clean the exhaust gases of diesel engines of particulate matter and nitrogen oxides must ensure not only additional filters or catalysts in the engine installed, but can be a piece weigh well over the program for the daily operation if the waste gases more or should be less clean. It is tended: Less exhaust gas will cost more energy
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In the United States Volkswagen is accused of the catalyst for the removal of nitrogen oxides while driving entirely overridden in order to reduce the consumption of diesel engines in everyday use.
© FAZ
The ever greater design freedom even away from the rough manipulation created by the technology of modern diesel engines. Are controlled to mainly the injection in combination with the air supply. The supplier Bosch – which provides the equipment, but not programmed – provides for the diesel engines now plants that inject the fuel with up to 2700 atmospheres pressure. At the same time can be a minute amount of fuel injected within an intake stroke in the meantime up to ten times. The injection times can be clocked at 0.07 to 5 milliseconds duration for breaks is the minimum time just 0.05 milliseconds. Prerequisite for exact dosing of fuel are fine nozzles with openings of less than 35 microns.
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It is so rough that the large pressure brings more power, the large number of small injections reduces the diesel knock. Who can control the injection accurately, thus also affected the more or less complete combustion process and hence the exhaust gases. A late injection of more fuel leads the other hand, approximately every 1000 kilometers on incomplete combustion and a fire in the particulate filter, so there burn the stored Rußteile.
Fewer emissions, more power
Because the diesel engines in Europe could emit until recently much more nitrogen oxides than in the United States, consisting of the Volkswagen Group still hope that in Europe new software many problems can solve. The California regulation for cars with “ultra-low” emissions permits an output of 12.5 milligrams of nitrogen oxides per kilometer, the national American limit for normal diesel 44 milligrams.
In Europe, the diesel engine to be lower emissions of carbon monoxide and dioxide was credited why the limits for the emission of nitrogen oxide were more generous. For the respective diesel engines model years from 2005 to July 2015 far higher limit values of 500 milligrams per kilometer were up to 2006 (after the Euro-3 standard) to 180 milligrams per kilometer until August 2015 (Euro 5). Since September 1st of this year the Euro-6 standard allows for new cars only 80 milligrams of nitrogen oxides per kilometer to.
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If now new software is to make the older diesel engines a little cleaner, however, this might cost a little performance or Consumption data deteriorate. It remains to be whether the data of the old Volkswagen then as far different from the promises of the prospectus that the manufacturer must provide for the clients for damages.
In the future, the question arises how far the engine, developers can afford to put only clean exhaust at the center. So far, the buyers of new models, the combination of lower emissions and consumption was offered along with more power in modified engines ever. Behind this lies the assumption that some customers could not convince them of a new vehicle, if the same poorer with lower exhaust emissions performance features.
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