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Development of specifications for heavy-duty tractor trucks in Canada and the United States

This collaborative study between the International Council on Clean Transportation (ICCT) and the North American Council for Freight Efficiency (NACFE) examines the process of how the features of...
Published 2018.10.23: Publication

Defeat devices under the U.S. and EU passenger vehicle emissions testing regulations

The paper aims to illuminate a paradox: Volkswagen and other automakers have asserted that software managing the emissions control systems on some of their vehicles, which they acknowledge either is...
Published 2016.03.22: Publication

FAQ: In-use NOx emissions from diesel passenger cars

As the story concerning in-use NOx emissions from diesel passenger vehicles continues to unfold, a number of questions concerning the ICCT's past and on-going research into discrepancies between...
Published 2015.09.25: News

Heavy-duty vehicle fuel-efficiency simulation: A comparison of US and EU tools

Vehicle simulation tools can enable a reliable estimation of the fuel efficiency of heavy-duty vehicles while eliminating undesirable sources of variation, such as driver behavior or the influence of...
Published 2015.05.11: Publication

Which vehicle emissions test cycle is most demanding?

After we published our new test cycle conversion factors, a question came up: which of the test cycles is the most demanding, in terms of its impacts on fuel efficiency or CO2 emissions, and how much...Even though it’s a simple enough question, it has no simple answer, since the new conversion factors vary with vehicle efficiency and are different for gasoline and diesel engines. However, in our...
Published 2015.02.06: Blog Post

Comparative assessment of heavy-duty vehicle regulatory design options for U.S. greenhouse gas and efficiency regulation

As regulatory agencies in the U.S. work on the second phase of heavy-duty vehicle greenhouse gas (GHG) and efficiency standards, one of the key decisions they face concerns the regulatory...
Published 2014.10.29: Publication

From laboratory to road: A 2014 update

Europe’s passenger-car efficiency regulation has very effectively driven down the official average CO2 emissions and fuel consumption of new passenger cars in the EU. The 2015 target of 130 grams of...
Published 2014.09.28: Publication

Measuring in-use fuel economy: Summary of pilot studies

Vehicle fuel economy is determined via a type-approval or certification process, which involves testing vehicles under laboratory conditions. But the information obtained via chassis testing under...
Published 2013.12.06: Publication

Of hybrids, metrics, and C-Maxes

The recent spate of news on Ford lowering the mileage rating on its C-Max hybrid (e.g., here and here and here) could lead some to question the in-use fuel economy benefits of hybrids. That would be...The recent spate of news on Ford lowering the mileage rating on its C-Max hybrid could lead some to question the in-use fuel economy benefits of hybrids. That would be a mistake.
Published 2013.08.16: Blog Post

From Laboratory to Road

Fuel consumption and carbon dioxide emission values for new cars in Europe are determined via the so-called type-approval process, which involves testing vehicles under laboratory conditions using...
Published 2013.05.27: Publication

Complexifying the report on the Fusion and C-Max hybrids a little

First Hyundai and Kia, now Ford? Last week Consumer Reports questioned the official estimates of fuel economy for Ford's new Fusion and C-Max hybrids, reporting that in their tests "the Fusion Hybrid...Hyundai, Kia—now Ford? Maybe, but some additional aspects to this situation with the Fusion and C-Max hybrids are worth calling to light.
Published 2012.12.11: Blog Post

Certification procedures for advanced technology heavy-duty vehicles

  Worldwide, commercial vehicles are a growing contributor to air pollution, fuel consumption, and global-warming emissions in the on-road transportation sector. As with passenger vehicles, there are...
Published 2012.02.15: 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

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

A model regulatory program for reducing exhaust and evaporative emissions from heavy-duty vehicles and engines

Commercial truck markets in emerging economies such as China, India, and Brazil now dwarf traditional markets in industrialized economies. Tremendous opportunities exist to improve public health...
Published 2007.11.30: Publication