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DieselNet: Diesel Engine Emissions Online

Engine & emission technology online—since 1997

The Log

20 February 2018: BP releases Energy Outlook 2018, expoecting that global energy demand will increase by about a third by 2040 [more ...].

9 February 2018: The IMO has agreed to move forward with a prohibition on the carriage of fuel oil for use on board ships, when that fuel oil is not compliant with a new low sulfur limit which comes into force from 2020 [more ...].

7 February 2018: Shale Reality Check, a report by David Hughes assesses the viability of the US EIA projections of the future shale oil and gas production and concludes that the official figures are overly optimistic. According the the report, the EIA mischaracterizes the source of recent productivity improvements (by assuming it’s mostly technology, not high-grading); extrapolates recent well productivity improvements far into the future, even though evidence suggests this is unwise; assumes that large areas that are not currently being drilled will be highly productive; and ignores price and profitability. The report is also available via Shalebubble.org, and a summary can be found on EcoWatch.

6 February 2018: Volkswagen-funded scientific research using animals and humans triggers undeserved backlash and condemnation [more ...].

30 January 2018: We have introduced a number of updates to the Technology Guide material on urea dosing and control in SCR systems. The former sections on NOx and ammonia sensors are now a stand-alone paper. These are the updated papers:

20 January 2018: Updated summary of Russian emission standards.

18 January 2018: Updated Technology Guide paper on Heavy-Duty Diesel Engines with Aftertreatment, which covers US 2010 and Euro VI engine technology.

12 January 2018: The newly released EPA CO2 emissions and fuel economy report shows that the US auto industry met the 2016 standards using past credits, while the actual CO2 emissions from new vehicles increased for the first time [more ...].

22 December 2017: The Technology Guide coverage of methane emissions has been greatly expanded with the addition of a paper on three-way catalysts for stoichiometric natural gas engines, and more background information on methane emissions from natural gas engines. The material is now covered by three papers:

21 December 2017: Updated Technology Guide paper on Miller Cycle Engines includes a new section on using IVC timing for low load exhaust temperature management in diesel engines, and expanded discussion of the effects of Miller cycle on combustion and engine efficiency in gasoline engines.

20 December 2017: Emission standards: Added summary of EU emission standards for large stationary engines.

15 December 2017: The California Air Resources Board approved 2030 Climate Change Scoping Plan and a $663 million low-carbon transportation funding plan [more ...].

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.

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.