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Real-world emissions testing on four vehicles

We commissioned the Laboratory of Applied Thermodynamics, of the Aristotle University of Thessaloniki, and its spin-off company, Emisia, to investigate real-world emissions of four Euro 6 passenger...
Published 2017.08.29: Publication

Too low to be true? How to measure fuel consumption and CO2 emissions of plug-in hybrid vehicles, today and in the future

The global market for electric vehicles is growing rapidly and plug-in hybrid electric vehicles (PHEVs) play a particularly important role given their relatively high market share – accounting for 13...
Published 2017.07.28: Publication

Laboratory and on-road emission testing of in-use passenger vehicles in India

Considering the overwhelming evidence of high in-use NOx emissions from diesel cars in Europe and the US, the impact of NOx emissions in human health, and the growing numbers of new diesel passenger...
Published 2017.06.26: Publication

Adding to the pile of evidence: Recent on-road testing results for CO2 and exhaust emissions from Euro 6 light-duty vehicles in the EU

In late 2015, in the immediate aftermath of the revelations about Volkwagen's cheating on vehicle certification tests in the United States, we commissioned Emissions Analytics, a commercial testing...Summarizes the Emissions Analytics testing on nitrogen oxides (NOx) and particulates, both of which pose significant health problems, and CO2 which is vehicles' main contribution to climate pollution...
Published 2016.11.14: Blog Post

Official vs. real-world road-load parameters in EU vehicle efficiency testing

On average, real-world fuel consumption and CO2 emissions of new European passenger cars exceeded official vehicle type-approval values by approximately 40 percent in 2014. This paper shows that...
Published 2016.05.09: Publication

The future of vehicle emissions testing in Europe (and beyond)

At the ICCT we have been analyzing the growing gap between official and real-world vehicle fuel consumption and CO2 emissions of passenger cars in Europe for a few years now. We showed for the first...To solve the problem underlying the growing gap between certification-test and in-use CO2 and NOx emissions, we will have to go beyond just introducing a new test procedure.
Published 2015.11.23: Blog Post

The future of vehicle emissions testing and compliance

A growing body of evidence indicates that one of the reasons for a rapidly growing discrepancy between official and real-world fuel consumption and emission values of new passenger cars is...
Published 2015.11.23: Publication

Will a new test procedure solve the problem? Latest developments on EU vehicle testing

Over the last few weeks, we published two major reports on the real-world emission behavior of passenger cars in Europe. The first one talked about air pollutant emissions, specifically nitrogen...Two recent ICCT reports clearly demonstrate the serious on-road problem for CO2 and NOx emissions in Europe. The European Commission is working on it, but the approaches chosen to address the real-...
Published 2014.10.30: Blog Post

The WLTP: How a new test procedure for cars will affect fuel consumption values in the EU

The current European type-approval procedure for fuel consumption and CO2 emissions of cars (the New European Driving Cycle, or NEDC) includes a number of tolerances and flexibilities and no longer...
Published 2014.10.29: Publication

World-Harmonized Light-Duty Vehicles Test Procedure

On November 14, the formal text for the World-Harmonized Light-Duty Vehicles Test Procedure (WLTP) was adopted by the United Nations Working Party on Pollution and Energy (GRPE). That decision must...
Published 2013.11.22: Publication

Discrepancies between type-approval and real-world fuel consumption and CO2 values in 2001-2011 European passenger cars

In order to limit the negative effects of climate change and to reduce dependency on oil imports, the European Union (EU) needs to reduce its GHG emissions by 80-95% below 1990 levels by 2050. A...
Published 2012.04.04: Publication

Inertia classes, vehicle emissions tests, and the dead hand of the past

Test procedures are a key feature of any system of regulating vehicle emissions. Vehicle emissions testing* involves running a vehicle on a chassis dynamometer, which (among other things) simulates...The current system of using inertia classes for vehicle emissions testing is an anachronism, kept in place by force of habit rather than force of logic. And it has the bad effect of allowing...
Published 2011.12.09: Blog Post

Vehicle test mass definition and inertia mass step-less approach

  At the 7th DTP meeting (Sept 12-14, 2011) it was agreed in principle to accept the proposal from the Netherlands (NL), Transport and Environment (T&E) and the International Council on Clean...
Published 2011.10.19: Publication

Estimated Cost of Gasoline Particulate Filters

The gasoline particulate filter (GPF) is a device that can be installed on the tailpipe of a gasoline vehicle to capture and reduce emissions of particulate matter, a common pollutant. The European...
Published 2011.10.19: Publication

Inertia classes proposal

Historically the weight of a vehicle was represented by hanging rotating inertia mass on a dynamometer. This approach required the use of discrete inertia classes and an upper limit for inertia mass...
Published 2011.06.17: Publication

Inertia classes in worldwide harmonized light vehicle test procedure (WLTP) development

The definition of vehicle weight used for testing procedures is an important decision when drafting the regulation on determining emission values under the WLTP. Currently, different inertia class...
Published 2011.05.18: Publication