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Review of results of emission tests by TNO on Mercedes diesel vehicles in relation to recent information on possible defeat devices

Author: Smokers, R.T.M. · Ligterink, N.E. · Gijlswijk, R.N. van · Kadijk, G.
Type:report
Date:2018
Publisher: TNO
Identifier: 805709
Report number: 2018-STL-NOT-0100312677
Keywords: Traffic · Mobility & Logistics · Urbanisation

Abstract

Upon request of the Dutch Ministry of Infrastructure and Water management, TNO has reviewed all its previously performed laboratory and on-road emission measurements on passenger cars and vans from Mercedes Benz to check for possible indications of two types of defeat devices: - one that switches off emission reduction systems after 26 km of driving, and - one that detects whether the vehicle is undergoing a type-approval test or is driving on the road on the basis of speed and acceleration patterns. From this review it is concluded that these on-road emission tests do not provide any indication of switching behaviour in the emission control software related to the driven distance after start of the trip.