Bosch allegedly developed the cleanest diesel in the world: With a greatly improved exhaust gas after treatment, the automotive supplier has succeeded in reducing the NOx emissions of a VW Golf in real road traffic to just 13 mg per kilometer. The cost of the components: around 100 euros.
An automotive supplier, of all people, wants to show car manufacturers how a diesel engine can meet even the strictest nitrogen oxide limits that will apply from 2020. “The nitrogen oxide problem in road traffic is technically solvable,” Bosch boss Volkmar Denner assured when he presented the technology on Wednesday. “After our breakthrough, we are certain that no one will be able to prohibit entry into the cities from the diesel engine in the future he will also keep his place in urban traffic, whether for craftsmen or commuters.”
Bosch wants to save the diesel technology
Breakthrough, revolution: Bosch chooses big words for its technology, which the engineers have tried out on a VW Golf. During a standard trip according to the RDE standard (Real Driving Emission), the Golf emitted an average of only 13 mg NOx per kilometer. The 100 engineers Bosch used for the development achieved this through numerous small, unspectacular changes. According to Bosch, the solution is a combination of sophisticated injection technology, a newly developed air system and intelligent temperature management.
Sophisticated thermal management of the diesel engine
They reduced the displacement of the Diesel Golf from 2.0 to 1.7 liters and moved the catalytic converter close to the engine in order to warm it up faster. In order to prevent the catalytic converter from not reaching operating temperature, the Bosch engineers have developed a thermal management system. For optimal nitrogen oxide conversion, the exhaust gases must be over 200 degrees Celsius hot. Such a high temperature is often not even reached when driving stop-and-go in congested cities.
In the converted VW Golf, tiny amounts of unused fuel are added to the catalytic converter immediately after the cold start. This trick brings the Kat to the optimum operating temperature within a maximum of 1.5 kilometers.