VII PTNSS Congress - 27th-29th June 2017
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On-road results from national testing campaigns, and screening technique for in-use testing

In 2013, the ICCT conducted testing on three diesel cars sold in the US market. Even though US-standards are among the most stringent globally, two of these cars – a VW Passat and a Jetta - were found to emit 5 to 35 times the Nitrogen-oxides (NOx) limit on-road, even during routine driving. The Environmental Protection Agency (EPA) and the California Air Resources Board (CARB) then started a long investigation that eventually lead VW to admitting to the use of an illegal defeat device that sensed the when the car was being tested and altered the effectiveness of the emissions control system accordingly. VW also admitted to using similar strategies on 8 Millions vehicles sold in Europe.
Following VW’s admission, several member states of the European Union, including the UK, France, Germany, and The Netherlands initiated their own investigations focused not only on VW but on the entire diesel car fleet. Tests were conducted using a combination of dynamometer and on-road testing. The test protocols varied, but in general they were designed with the purpose of finding suspicious emissions control behavior. In parallel, The ICCT has been conducting our own research with the purpose of developing a methodology to, as conclusively as possible, prove the existence of a defeat device test through vehicle testing. The methodology focuses not only on the testing of individual vehicles, but on techniques for screening the fleet to select vehicles for testing with the highest probability of having a defeat device.
This presentation will provide an overview and critique of the different member states’ testing campaigns and, in addition provide preliminary findings on the ICCT’s research aimed at developing a methodology to screen and test for defeat devices.
Topic: Fuel injection systems and mixture formation
Author: Yoann Bernard