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DieselNet: Diesel Engine Emissions Online

Engine & emission technology online—since 1997

The Log

30 November 2017: Summary of technical sessions from the 15th FAD Conference held on 8-9 November 2017 in Dresden, Germany [more ...].

28 November 2017: The US EPA has published a chassis dynamometer test report that compares emissions from two newly manufactured (MY 2016 and 2017) glider trucks powered by remanufactured pre-2002 engines, with emissions from two conventionally manufactured MY 2014 and 2015 tractors (see also the regulatory docket). Under highway cruise conditions, NOx emissions from the glider vehicles were approximately 43 times as high, and PM emissions were approximately 55 times as high as those from the conventionally manufactured 2014 and 2015 tractors. Under transient operations, the glider vehicle NOx emissions were 4-5 times higher, and PM emissions were 50-450 times higher than the conventionally manufactured tractors. On November 9, 2017, the EPA Administrator Pruitt signed a proposed rule that would change the current interpretation of the US Clean Air Act, exempting glider trucks from EPA emission regulations. The new EPA data suggests that if the proposed rule is adopted, it could open a major loophole in the US emission regulations for heavy-duty onroad trucks.

20 November 2017: Updated and expanded Technology Guide paper on Methane Oxidation Catalysts.

9 November 2017: The European Commission has proposed new CO2 emission standards for passenger cars and light commercial vehicles (vans) in the European Union for the period after 2020 [more ...].

6 November 2017: The average gap between official fuel consumption figures and actual fuel use for new cars in the EU has reached 42%, according to the International Council on Clean Transportation (ICCT). The 2017 update of From Laboratory to Road study, which covers 1.1 million passenger cars from 14 data sources and eight European countries, shows that the gap between official and real-world CO2 values increased from 9% in 2001 to 42% in 2016. While the average official CO2 emission values of new European passenger cars have decreased by 30% since 2001, the gap between real-world and official CO2 emission values increased over time and effectively cancelled out two-thirds of the on-paper efficiency improvements. However, for the first time, the growth in the gap shows signs of slowing down and is further expected to decrease as the EU adopts the new WLTP test procedure.

31 October 2017: Summary of the technical sessions from ASME Internal Combustion Engine 2017 Fall Technical Conference (ICEF 2017) that was held on October 15-18, 2017 in Seattle, Washington, USA [more ...].

27 October 2017: Sierra Instruments updated its DieselNet presence to reflect the current portfolio of products and services.

13 October 2017: The October issue of Johnson Matthey Technology Review includes a number of topics related to emissions from transport—a summary of China 6 emission standards for light-duty vehicles, using methanol as transportation fuel, control of GDI emissions to meet Euro 6c standards, and an overview of gasoline vehicle aftertreatment technologies.

30 September 2017: Updated paper on Combustion Systems covers new Sandia research on stepped-lip combustion bowls, more information on the Volvo WAVE piston, and other updates. The material on Piston Cooling that used to be a part of this paper is now a stand-alone paper.

25 September 2017: Updated Technology Guide paper on Dimethyl Ether includes more information on standard specifications for fuel-grade DME and other updates.

22 September 2017: In an open letter, Andreas Mayer delivers a strong critique of a recent journal paper on the health effects of excessive NOx emissions from diesel cars [more ...].

9 September 2017: Updated paper on Variable Compression Ratio, with rewritten and expanded sections on the benefits of variable compression ratio in diesel and gasoline engines.

5 September 2017: A new Technology Guide paper describes Gasoline Particulate Filters.

29 August 2017: Emission standards: Updated summary of EU light-duty emission regulations includes more details on the transition to the new WLTP emission test and other changes.

24 August 2017: Updated paper on Diesel Fuel Injector Nozzles features an expanded section on injector sac, with a new video and figures.

12 August 2017: The Technology Guide discussion of diesel combustion has been updated and re-structured into two papers: Combustion in Diesel Engines and Diesel Spray Formation and Mixing. A new section on in-cylinder mixing enhancement was added in the latter paper.

8 August 2017: Updated Technology Guide paper on Soot (PM) Sensors, with revised sections on RF sensors and accumulating electrode soot sensors.

29 July 2017: Summary of the technical sessions from the 21st ETH Conference on Combustion Generated Nanoparticles [more ...].

Diesel Engine & Emissions

The diesel engine is the most efficient power plant among all known types of internal combustion engines. Heavy trucks, urban buses, and industrial equipment are powered almost exclusively by diesel engines all over the world and diesel powered passenger cars are increasingly popular. For the foreseeable future, the world’s transportation needs will continue to rely on the diesel engine and its gasoline counterpart. However, both engine technologies are evolving at an ever increasing pace to meet two major challenges: lower emissions and increased energy efficiency.

Internal combustion engines are significant contributors to air pollution that can be harmful to human health and the environment. In response, clean diesel technologies with near-zero emissions of NOx and PM have been developed and introduced in regions with the most stringent emission standards: North America, Europe and Japan. While new clean diesel engines are gradually replacing the population of older diesel engines in these regions, older engines already in service are being retrofitted with clean diesel technologies to hasten emissions reductions. As this trend spreads to other parts of the world, the environmental focus has shifted to climate changing emissions and energy efficiency. The environmental benefit of low greenhouse gas emissions, traditionally associated with the diesel engine, is no longer sufficient. To meet future greenhouse gas and fuel economy regulations, new technologies are being developed—low temperature combustion, waste heat recovery, powertrain electrification, to name a few—that further increase the efficiency not only of the diesel engine powertrain but the entire vehicle as well. Under low-carbon regulatory policies, the scope for potential improvements is no longer limited to engines and vehicles, but also includes life cycle effects of fuel production and vehicle manufacture.

DieselNet, the only information service exclusively devoted to diesel engines and emissions, is an internet forum for the exchange of technical and business information on diesel engines, fuels, emissions and many of the important technologies required by the clean and efficient diesel engines of the future.