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In early 2020, UK-based independent testing firm Emissions Analytics published a study claiming that tire particulate wear emissions were 1,000 times worse than exhaust emissions ( earlier post ). As a result, distance-specific mass and number emissions can be derived, which can then be compared to equivalent tire metrics.
New research by George Mason University found that exposure to certain air pollutants is linked to increased emergency department (ED) visits for respiratory and cardiovascular diseases. We estimated associations between twelve ambient air pollutants of both primary (e.g. The study is published in the journal Environment International.
A new report released by the Air Quality Expert Group ( AQEG ) in the UK recommends as an immediate priority that non-exhaust emissions (NEE) are recognized as a source of ambient concentrations of airborne PM, even for vehicles with zero exhaust emissions of particles. —“Non-Exhaust Emissions from Road Traffic”.
The capability to heat up the catalytic converter rapidly at all times increases the overall efficiency of exhaust-gas aftertreatment. This means that the vehicles will be prepared to meet the future extremely stringent Euro 7 standard. In the Super Clean Electrified Diesel, the efficiency of exhaust gas aftertreatment rises to 97%.
Volvo Trucks unveiled Vera : an autonomous, electric vehicle that can operate with significantly less exhaust emissions and low noise levels. Growing world population and increasing urbanization are leading to significant challenges to solve environmental issues such as congestion, pollution and noise.
Contrary to expectations, exhaust from gasoline vehicles contributes more to the production of secondary organic aerosols (SOA) than exhaust from diesel vehicles, according to a new study by scientists from the Cooperative Institute for Research in Environmental Sciences (CIRES), NOAA’s Earth System Research Laboratory (ESRL) and other colleagues.
They found that the level of emissions of regulated and unregulated pollutants in diesel exhaust depends on fuel, load, engine calibration, and exhaust aftertreatment technology. Unregulated pollutants also include ozone precursors and bioaccumulative and toxic compounds. L) and medium-duty (6.4 —Chin et al.
Emissions from automobile exhaust systems have decreased in recent years due to the introduction of cleaner fuels and new control technologies on internal combustion engines, as well as increases in numbers of hybrid and electric vehicles. The project will be executed as four integrated sub-studies.
Key goals are to further reduce greenhouse gas emissions and toxic air pollutants such as NO x , cut fuel consumption and minimize the engine footprint through an integrated design optimized for both newbuilds and retrofits. technologies will enable improved engine performance with both LNG and future carbon-neutral fuels. development.
An electrically driven compressor for precise exhaust gas recirculation is also used. Then we modify the timing and pressure of the injection, among other things, and look at exhaust emission values and fuel consumption. This is done via exhaust gas recirculation (EGR). —Patrik Soltic. The first results are very promising.
A fleet average nonfuel nonexhaust VOC emission factor of 58 ± 39 mg veh –1 km –1 was calculated for the missing source, which is greater than the total of all VOCs emitted from vehicle exhausts and their associated evaporative fuel losses. While some VOCs are released in exhaust, others may arise from an unexpected source—e.g.,
In 2020, independent global emissions testing company Emissions Analytics reported that pollution from tire wear can be 1,000 times worse than what comes out of a car’s exhaust. Earlier post.) NEEs are currently believed to constitute the majority of primary particulate matter from road transport, according to Emissions Analytics.
Fuel-cycle SO 2 emissions of EVs compared to those of gasoline ICEVs and HEVs in China, current (left) and future (right). The study examined the fuel-cycle CO 2 , SO 2 , and NO x emissions of EVs in China in both current (2008) and future (2030) periods and compared them with those of conventional gasoline vehicles and gasoline hybrids.
To improve fuel efficiency, advanced combustion engines are being designed to minimize the amount of waste heat in the exhaust. As a result, future generations of exhaust after-treatment catalysts must perform at temperatures that are 100 °C lower than current catalysts. —Nie et al.
But, in many high-use areas and remote locations, upgrading grid connections to meet future charging demand is not practical or commercially viable. IPG‘s flameless combustor uses the turbine exhaust and high heat transfer effectiveness through the IPG regenerator unit.
The engine was also equipped with an electrically driven volumetric pump in the exhaust gas recirculation (EGR) path which gives the freedom to set any desired EGR rate, independently from the pressure ratios across the turbocharger. The common rail pump was externally lubricated by engine oil so that it can handle the low fuel lubricity.
These engines produce a high number of fine particulates that pollute the air. As North America continues to strive for cleaner air through tighter regulations, there are strong indicators that GPF technology also may expand to the region in the near future.
Tula Technology is presenting its diesel Dynamic Skip Fire (dDSF) technology ( earlier post ) at the 4 th Future Diesel Powertrain Summit China 2020 on 24-25 September 2020 in Shanghai, China. Cylinder deactivation also reduces excess engine airflow, increasing exhaust temperatures. dDSF Simulation Project.
One of the main groups of pollutants resulting from fuel combustion is the oxides of nitrogen, or NO x. Future fuel economy standards will result in lower exhaust gas temperatures and limit the use of high-temperature SCR. SwRI and UTSA plan to develop a novel catalyst for low-temperature SCR to reduce emissions.
the criteria pollutants and CO 2 that emerge with the exhaust from the tailpipe. However, there is more than 15 years of research showing that the contribution of non-exhaust primary particles to the total traffic generated primary particles is significant in urban areas. Further, a 2013 review by Denier van der Gon et al.
Power management company Eaton’s Vehicle Group has demonstrated cylinder deactivation (CDA) as an effective technology for meeting future global emissions requirements for diesel-engine powered commercial vehicles. Environmental Protection Agency (EPA) and European Commission (EC) are slated for adoption in coming years.
Researchers at Oak Ridge National Laboratory (ORNL) have developed a ternary mixed oxide catalyst composed of copper oxide, cobalt oxide, and ceria (dubbed “CCC”) that outperforms synthesized and commercial platinum group metal (PGM) catalysts for CO oxidation in simulated exhaust streams while showing no signs of inhibition—i.e.,
Thirty-seven globally prominent scientists representing the International Journal of Engine Research have published an open-access editorial addressing the future of the Internal Combustion Engine, and stressing the importance for continued development of more efficient and even lower-emitting technologies. —Reitz et al.
New research from Chalmers University of Technology, Sweden, finds that the discharge water from ships’ exhaust gas treatment systems—i.e., A scrubber is used on ships to clean exhaust gases, primarily to reduce emissions of sulfur oxides to the atmosphere. Marine Pollution Bulletin , Volume 182, doi: 10.1016/j.marpolbul.2022.113904.
While changes in DNA methylation have been associated with traffic-related air pollution in observational studies, the specific mechanisms have not been explored in a controlled study of asthmatics. Usually when we look at the effects of air pollution, we measure things that are clinically obvious—air flow, blood pressure, heart rhythm.
The measurements of the retrofitted Euro III bus were an extension of a study of the Brighton & Hove Bus and Coach company fleet in partnership with HORIBA examining the real-world emissions of buses operating through a known pollution hot spot in Brighton city center.
This work dispels the myth that low carbon vehicles simply displace emissions from the exhaust to other sources. This highlights the importance of deploying low weight, low carbon alternatives to current steels in the ultra-low carbon vehicles of the future. Vehicle Whole Life Carbon Emissions Analysis. Estimated lifecycle.
Additionally, LNG engines are tuned to either emit low nitrogen oxide (NO x ) emissions—at the cost of higher methane emissions in some cases—or to incorporate NO x reduction technologies such as exhaust gas recirculation (EGR) or selective catalytic reduction (SCR). As of November 2019, VLSFO was nearly as expensive as MGO.
Non-exhaust traffic sources of particles. However, traffic-related non-exhaust particles remain largely unchanged, making these emissions increasingly significant contributors to the environmental burden. These non-exhaust vehicle sources include: brake lining, tire and road-surface wear, and resuspension of road dust.
Battery electric cars emit less greenhouse gases and air pollutants over their entire life cycle than petrol and diesel cars, according to a European Environment Agency (EEA) report. In future, with greater use of lower carbon electricity in the European mix the typical GHG emissions saving of BEVs relative to ICEVs will increase.
The first study to conduct a comprehensive evaluation of lifetime exposure to new technology diesel exhaust (NTDE)—i.e., exhaust from heavy-duty diesel engines meeting EPA 2007 and later emissions requirements—has found no evidence of carcinogenic lung tumors. Earlier post.) Earlier post.)
Contribution of gasoline and diesel exhaust to SOA over 0% to 50% diesel fuel use. The study determined that, depending on a region’s fuel use, diesel exhaust is responsible for 65% to 90% of vehicular-derived SOA, with substantial contributions from aromatic and aliphatic hydrocarbons. Gentner et al. Click to enlarge. Earlier post.).
In part it is difficult to identify significant air quality improvements from a specific program—especially one targeted at a small area within a large city—against the backdrop of broader regional pollutant and weather changes. Within the CCZ, the investigators projected a net decline of 1.7 µg/m 3. in PM 10.
The minimum in NO x and NMOG emissions for midlevel ethanol blends points to future opportunities for emission reductions from FFVs. The study thus included the current predominant market fuel (E10); a range of possible future midlevel ethanol blends (E20?E40); Engine-out exhaust contains typically 1?3% Click to enlarge.
Gasoline- and diesel-engine contributions to total on-road vehicle emissions are functions of traffic volumes and vehicle exhaust emission rates, which are both subject to variations in space and time. Of the pollutants measured, gasoline vehicles showed higher emission factors compared to diesel for CO only. —Dallmann et al.
Researchers at the Korea Institute of Machinery and Materials (KIMM) have developed a new hybrid reactor for automotive exhaust aftertreatment that combines plasma and a honeycomb-structured monolith catalyst resulting in an enhanced synergistic effect of low-temperature catalytic activity. catalyst reactor. Credit: ACS, Kang et al.
Previous studies have shown that it is possible to operate diesel engines with 100% DME, but that this requires significant effort (injection components, combustion process, exhaust gas aftertreatment, tank system) in terms of conversion.
If it is required and restarted, the exhaust flow is also cold at first—possibly too cold to convert pollutant gases in the catalyst. The system solution, consisting of heating disc and DC/DC converter, upgrades exhaust-gas aftertreatment systems for even stricter emission standards worldwide in the future.
What isn’t often discussed is the potential for EVs to reduce noise pollution. With that in mind, here’s a closer look at EVs and their impact on noise pollution. How Are Automakers Reducing Noise Pollution? Reducing pollution starts with EV production. Reduced noise and air pollution are excellent public health outcomes.
Higher levels of olefin mean more smog will be formed from tailpipe emissions since hydrocarbons, including olefin, react with sunlight and other pollutants to form smog. Chevron was notified by ARB of the violation, and took immediate steps to find and rectify the cause to prevent future occurrences.
Dr. Martin Winterkorn, Chairman of the Board of Management of Volkswagen AG, gave a forecast of future drive system technologies. Jürgen Leohold, Executive Director Volkswagen Group Research. Click to enlarge. At the International Vienna Motor Symposium Prof.
1) with cooled exhaust gas recirculation (EGR) and high compression ratio (13.3:1 diesel engines are expected to meet significant technical barriers in being able to meet future NO x regulations. The ORNL team conducted engine experiments with both 91 RON E10 gasoline and liquified petroleum gas (LPG). Splitter et al.
Ship engine exhaust emissions make up more than a quarter of nitrogen oxide emissions generated in the Australian region according to a recently-published study by CSIRO and the Australian Maritime College in Launceston. The authors commenced this study with measurements of ship exhaust emissions on the coastal cement carrier MV Goliath.
However, they also found that decreases in emissions of these pollutants appear to be slowing down and may have leveled off. 40%, CO running exhaust emissions from on-road vehicles decreased by ?80?90% Among their findings were that: Despite increases in fuel use of ?10?40%, The ratio of NMHC/CO was found to be 0.24 ± 0.04
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