The Log

26 September 2014: Updated paper on Exhaust Gas Recirculation—added sections on dedicated EGR and on EGR in gasoline engines.

25 September 2014: The European Commission proposes Stage V emission standards for mobile nonroad engines. The proposal includes a particle number limit that would force DPF technology on nonroad engines of 19-560 kW [more ...]

23 September 2014: AVL updated their DieselNet content with information on the iGeneration Series II emission testing system.

22 September 2014: Global CO2 emissions last year reached 36.1 billion tonnes, 706 million tonnes or 2.3% more than in 2012, according to a series of new studies. Most of the increased emissions came from India, China and the United States. The scientists predict that CO2 emissions will continue to increase in the future (by 2.5% this year), and estimate that in 30 years the world will warm by about 1.1°C from now.

8 September 2014: Presentations and posters from the 18th ETH Conference on Combustion Generated Nanoparticles, held in Zürich on June 22-25, 2014, are now available for download from the conference website.

2 September 2014: Updated summary of Indian 2- and 3-wheel vehicle emission standards reflects the recently adopted BS IV standards for motorcycles.

25 August 2014: You can now follow us on Twitter to stay updated and to receive notifications about news, site additions, etc. This should be especially useful for those who do not use our RSS feed.

23 August 2014: A new Technology Guide paper titled Powerplants and Drivetrains: Potential Alternatives talks about alternatives to the diesel engine [announcement | paper]

22 August 2014: Emissol—now on DieselNet—is an engineering firm specializing in automotive powertrain technologies, engine emission reduction and aftertreatment technologies.

21 August 2014: Updated Technology Guide paper on PM Measurement: In-Situ Methods—added section on field measurement of particle number concentrations.

20 August 2014: EU Commission will release their real driving emissions (RDE) proposal for light-duty vehicles by the end of this year, according to Reuters. The current European NEDC test underestimates the emissions of CO2 and NOx that are observed under real driving conditions. This discrepancy is believed to be responsible, at least in part, for the fact that the consecutive tiers of EU emission standards have brought less air quality improvement than anticipated. The new RDE testing approach has been under development for a number of years to more accurately represent real world driving. RDE testing requirements could make the existing emission standards significantly more challenging for the automakers.

13 August 2014: Updated Technology Guide paper on Superchargers—added information on Audi’s electrically driven centrifugal supercharger.

7 August 2014: Updated Technology Guide paper on Urea Dosing and Injection Systems.

28 July 2014: Soot (PM) Sensors—a new Technology Guide paper provides an overview of sensors for DPF soot mass estimation and OBD-type sensors for the detection of DPF leaks.

17 July 2014: Updated paper on Turbocharger Durability and Materials—a new section has been added on turbine housing materials.

16 July 2014: Updates in the Technology Guide paper on Particle Oxidation Catalysts.

15 July 2014: CTI has released the final program of the upcoming Emission Challenges Conference to be held in Troy, MI, USA on September 9-10, 2014.

10 July 2014: Summary of technical sessions from the 18th ETH Conference on Combustion Generated Nanoparticles held on June 22-25, 2014 in Zürich [more ...]

8 July 2014: VERT Association—now on DieselNet—aims at promoting best available technologies (BAT) for the reduction of particle number emissions from internal combustion engines and runs an internationally recognized VERT verification program for emission reduction technologies.

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.