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DieselNet: Diesel Engine Emissions Online

Engine & emission technology online—since 1997

The Log

8 October 2018: The UN Intergovernmental Panel on Climate Change (IPCC) released a Special Report on Global Warming of 1.5°C. The report shows that a number of climate change impacts could be avoided by limiting global warming to 1.5°C, as opposed to 2°C or more. However, limiting global warming to 1.5°C would require “rapid and far-reaching” transitions in land, energy, industry, buildings, transport, and cities. Global net human-caused CO2 emissions would need to fall by about 45% from 2010 levels by 2030, reaching ‘net zero’ around 2050. To achieve these objectives, the average annual investment in the energy system alone is estimated at 2.4 trillion USD2010 between 2016 and 2035, representing 2.5% of the world GDP. But the reality is that at the current level of emission reduction commitments under the Paris agreement, the world is on course for a 3°C of warming, and the global carbon emissions from the energy sector are not being reduced—they continue to increase.

27 September 2018: The updated Technology Guide paper on Engine Fundamentals includes a new section on stroke-to-bore ratio, new discussion of brake thermal efficiency, an example of a commercial application of the Atkinson concept (the actual Atkinson concept of different geometric compression and expansion ratios, not the Miller cycle commonly confused with it), and a number of other updates. The paper includes three new figures and one new video.

25 September 2018: The global oil demand is forecasts to grow to reach 111.7 million barrels per day in 2040, according to the newest edition of the OPEC World Oil Outlook. Oil consumption growth is expected to be faster in the medium-term, driven in part by the IMO marine fuel quality regulations that become effective from 2020 [more ...].

24 September 2018: Updated and expanded Technology Guide paper on Scavenging in Two-Stroke Engines includes four new figures and one new video.

4 September 2018: Updated summary of China’s emission standards for onroad heavy-duty engines and for nonroad engines.

3 September 2018: Updated and expanded Technology Guide paper on Exhaust Particulate Matter discusses particle emissions from diesel and gasoline engines.

27 August 2018: Fossil Fuels and Future Mobility, a new, top-level Technology Guide paper reviews some important concepts relevant to the energy supply of the world’s economy and the transition of the energy system away from fossil fuels.

25 August 2018: John Deere on DieselNet—updated page on John Deere engines and powertrains.

24 August 2018: Updated summary of China’s emission standards for marine engines and diesel and gasoline fuel regulations.

21 August 2018: US EPA proposed to reverse the Obama-era Clean Power Plan (CPP) that imposed GHG emission reduction requirements on coal-fired power plants. The EPA is instead proposing a new rule, entitled the Affordable Clean Energy (ACE) Rule, which delegates any regulation of GHG emissions from the coal industry to the states. While states would be empowered to regulate GHG emissions, they would not be under a mandate to do so. The proposal is intended to counteract the decline of the US coal industry and to facilitate economic growth—the EPA projects the ACE Rule would reduce the coal industry compliance burden by up to $400 million per year when compared to CPP. The emission impact of the proposed rule appears marginal—the EPA estimates that the ACE Rule could reduce 2030 CO2 emissions by up to 1.5% from projected levels without the CPP. The CPP, adopted in 2015, was designed to reduce carbon pollution from the power sector by 32% below 2005 levels by 2030.

9 August 2018: Updated Technology Guide paper on Engine Intake Charge Management provides a more comprehensive coverage of the topic and discusses both diesel and spark-ignited engines.

2 August 2018: The US EPA and NHTSA released a notice of proposed rulemaking to relax the existing GHG emission and CAFE fuel economy standards by freezing them at the 2020 levels. The EPA would also withdraw the California waiver for their LEV III & GHG emission regulations, to prevent the state from enforcing their own, more stringent standards [more ...].

31 July 2018: Cummins to recall 500,000+ heavy-duty truck engines in the United States over SCR catalysts [more ...].

25 July 2018: Summary of the technical sessions from the 5th Conference on Emission Reduction and Emission Sensors, held in Stuttgart, Germany on July 10-12, 2018 [more ...].

20 July 2018: The D.C. Circuit Court issued a temporary stay of the EPA’s decision to stop enforcing production caps on glider trucks after the Center for Biological Diversity, Environmental Defense Fund and Sierra Club filed an emergency motion.

17 July 2018: Global energy investment in 2017 failed to keep up with energy security and sustainability goals, raising concerns about the long-term adequacy of world’s energy supply, according to the World Energy Investment 2018 report released by the IEA [more ...].

9 July 2018: The ETH Conference on Combustion Generated Nanoparticles has posted a video about the 2018 Nanoparticles Conference, including the conference history and several interesting interviews.

5 July 2018: Updated Technology Guide paper on Waste Heat Recovery includes a new section on thermoacoustic converters and 5 new figures.

30 June 2018: Summary of the 22nd ETH Conference on Combustion Generated Nanoparticles, held on June 18-21, 2018 in Zürich, Switzerland [more ...].

28 June 2018: Summary of the 6th International Exhaust Emissions Symposium (IEES) by the BOSMAL Automotive Research & Development Institute, held on June 14-15, 2018 in Bielsko-Biała, Poland [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.