Mobile machines operate cleaner than Cars

Mobile machines operate cleaner than Cars

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Stubbornly keeps the prejudice of the exhaust emission standards for agricultural and construction machinery are more lax than those for Cars. A study of the Institute for Mobile machines at the Karlsruhe Institute for technology (KIT) demonstrates the opposite. The specifications must meet exhaust emissions from off-road engines with the same technical effort to be cleaned, such as in the case of Truck. And: The next Grenzwertverschärfung is already in sight.

It is a common cliché: Car meet thanks to high-tech drives the most stringent emission standards, while excavators, tractors and locomotives with old diesel technology makes the air pollute. “The reality has little to do”, contrary to Marcus Geimer, chair of Mobile machines at the Karlsruhe Institute for technology (KIT). In a recent study, he proves his opposition with Numbers.

The study represents the limits of the latest emissions stage Euro 6 for passenger Cars and the since 1. January 2015 current level IV to Directive 97/68/EC for agriculture, construction machinery, ships and Railways, in the power range of 56 kW to 560 kW. Although this comparison only through conversions. While the pollutants in Car exhaust in g/km on the track in relation to be specified, the measurement of the mobile machine in g/kWh – a dredger in use uses fuel, drives it but no routes.

Geimer developed in his study of conversion factors, with which the limit values directly to compare. First, an ideal value is determined. This is required by the EU CO2-Flottenwert of 120 g/km based on the on the real measured CO2Equivalent of 2.70 kg/l diesel fuel to an average of 4.44 l on 100 km is closed. This is in Relation to the specific fuel consumption of modern diesel engines, ideally 200 g/kWh. Sets this ideal value, as well as 0.83 kg/l Kraftstoffgewicht and 4.4 l/100 km consumption based, then an optimally adjusted diesel engine with 1 kWh of exactly 5,42 km far. This value is a first possible conversion factor of streckenbezogenen to energy-related emissions.