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DieselNet: Diesel Engine Emissions Online

Engine & emission technology online—since 1997

The Log

26 April 2017: Cormetech manufactures homogeneous titania-based ceramic honeycomb SCR catalysts and provides catalyst testing and analysis services.

24 April 2017: We’ve updated the Technology Guide material on idle reduction technologies and restructured the idle emission coverage into two papers: Idling Emissions and Idle Reduction Technologies.

11 April 2017: The fuel efficiency and CO2 emissions of European heavy-duty vehicles have improved significantly over the last 20 years, according to a new ACEA report Reducing CO2 from trucks: Progress in practice. While the rate of improvement varies between manufacturers, it has been on the order of 1% per year.

27 March 2017: Updated Technology Guide paper on Valves and Ports in Four-Stroke Engines—we added a new section discussing the impact of cylinder head manufacturing on swirl and flow.

20 March 2017: Updated and expanded Technology Guide paper on Fuel Property Testing: Low Temperature Operability.

15 March 2017: US EPA/NHTSA to re-open Midterm Evaluation of the 2025 GHG emission and fuel economy standards [more ...].

14 March 2017: Updated and expanded summary of the WLTC test cycle.

13 March 2017: A new section on white smoke control has been added in the Technology Guide paper on HD Diesel Engine Technology—US 1990-1998.

28 February 2017: New Technology Guide paper discusses Variable Compression Ratio technologies.

25 February 2017: Environment and Climate Change Canada has released a discussion paper on the Clean Fuel Standard. The objective of the Clean Fuel Standard is to achieve 30 megatonnes of annual reductions in GHG emissions by 2030, contributing to Canada’s effort to achieve its overall GHG mitigation target of a 30% emission reduction below 2005 levels by 2030. The Clean Fuel Standard would be a flexible, performance-based approach to incentivize the use of lower carbon fuels, alternative energy sources and technologies, such as electricity, hydrogen, and renewable fuels, including renewable natural gas—states the discussion paper. Requirements would be set to reduce the lifecycle carbon intensity of fuels supplied in a given year, based on lifecycle analysis. However—in an apparent contradiction—the approach would not differentiate between crude oil types produced in or imported into Canada. The Clean Fuel Standard would address gaseous, solid and liquid fuels, and would go beyond transportation fuels to include those used in industry, homes and buildings. Public comments are accepted until April 25, 2017.

24 February 2017: European truck manufacturers call for action to prevent tampering of emission controls [more ...].

17 February 2017: Fuel regulations: Updated summary of Mexican diesel fuel standards includes the current NOM-016 specification.

2 February 2017: Emission standards: Added summary of Canadian emission standards for stationary spark-ignition engines under the Multi-Sector Air Pollutant Regulations (MSAPR).

1 February 2017: Volkswagen reaches agreements with private plaintiffs and the US Federal Trade Commission to settle 3.0 L diesel vehicle claims in the United States [more ...], while Robert Bosch agrees to pay $327.5 million to settle civil claims in relation to its role in the development of the cycle beating VW software strategy [more ...].

27 January 2017: The European Commission has published a Guidance on the evaluation of Auxiliary Emission Strategies and the presence of Defeat Devices. The document is intended to assist member states in the implementation of Regulation (EC) 715/2007, but by itself is not legally binding.

25 January 2017: Updated summary page of Canadian emission standards.

24 January 2017: New Technology Guide paper Miller Cycle Engines discusses over-expanded engine cycles, often referred to as Miller or Atkinson cycles. The paper covers the definitions, theoretical principles, early and late intake valve closing strategies, as well as diesel and gasoline engine applications—the latter including naturally aspirated engines, boosted engines and high BMEP gasoline engines. Happy Reading!

11 January 2017: Volkswagen pleads guilty to US criminal charges, agrees to pay $4.3 billion in criminal and civil penalties. In addition, six VW executives are indicted with conspiracy to cheat US emission tests [more ...]

23 December 2016: The US EPA intends to initiate the rulemaking process to develop low-NOx emission standards for heavy-duty on-road engines. The new standards would become effective in model year 2024 [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.