Published: Tue, February 20, 2018
Hi-Tech | By Grace Becker

After VW, Mercedes too under scanner for diesel emissions

After VW, Mercedes too under scanner for diesel emissions

The Mercedes-Benz diesel powered cars tested in U.S. by investigators, passed the emission tests without any trouble.

In the aftermath of the Volkswagen dieselgate scandal, US regulators have cracked down on diesel emissions by further investigating diesel vehicles beyond previously accepted testing processes.

Reports are now indicating that Mercedes-Benz parent company Daimler might have used software to help it pass U.S. emission tests.

Daimler has already admitted significant consequences may arise following reports in Germany's Bild am Sonntag newspaper that ongoing USA and German investigations are determining whether multiple functions in the software could be used to cheat tests, and that Daimler's own employees questioned their legality.

According to German paper Bild am Sonntag (via Automotive News) citing emails from Daimler's engineers, company employees were questioning whether two engine management functions could be considered defeat devices.

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A Daimler spokesman declined to comment on the content of the documents, saying the German company was fully cooperating with the US authorities and had agreed upon strict confidentiality with the Department of Justice. "The authorities know about the documents and no complaint has been filed". A second software element allowed the emission system to recognize whether the vehicle was being tested based on speed or acceleration patterns.

If true, it would mean the AdBlue fluid that vehicle makers, including Mercedes, claim makes diesel cleaner than petrol cars is not being injected into the exhaust system. One reportedly reduced or halted emissions scrubbing after 26 km, or 16 miles, stopping the injection of diesel exhaust fluid (AdBlue) that cleansed the exhaust gas.

Joerg Howe, a spokesman for the Stuttgart, Germany-based manufacturer, said the documents have "selectively been released in order to harm Daimler and its 290,000 employees". The software works for exactly the same as the United States highway testing cycle.

Daimler reportedly developed software with several functions to be able to trick U.S. regulators.

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