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Comparison of ISFC (@42.9 The results represent a light-load indicated efficiency improvement of 15-30% (up to 40.9%). The test engine for the paper was a 250cc single-cylinder unit with dual-camshaft-actuated reciprocating sleeve valves for induction and exhaust. Source: Pinnacle. Click to enlarge.
Rolf Reitz of the University of Wisconsin found that reactivity controlled compression ignition (RCCI) ( earlier post ) in a light-duty engine can meet Tier 2 Bin 5 NO x levels without aftertreatment, while offering a 4% improvement in fuel consumption and 7.3% Earlier post.). —Kokjohn and Reitz. Sage L Kokjohn and Rolf D.
Cummins is one year into a four year program (ATLAS, Advanced Technology Light Automotive Systems) to develop, in partnership with the US Department of Energy (DOE), a new light-duty diesel truck engine that will meet Tier 2 Bin 2 (SULEV) emission requirements while achieving at least a 40% fuel economy improvement (26.1 mpg US vs. 18.6
A new study led by researchers at the University of Michigan compared regulated and unregulated emissions from both light-duty passenger car (1.7 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.
Comparison of fuel consumption of Omnivore, homogeneous Gasoline Direct Injection (GDI) and Spray-Guided GDI engines. Downsizing therefore isn’t vital and, due to the improved light-load efficiency and emissions performance we see with Omnivore, this technology approach and ‘upsizing’ could permit a more efficient engine. Displacement.
Given its high efficiency and its performance and in light of climate change, the diesel engine will remain an important technology for years to come, especially for those who travel long distances. Demand for diesel cars was particularly strong among private customers, where the share almost doubled from 15% in 2017 to 27% last year.
The recuperated engine uses isothermal compression via cryogenic injection to enable significant exhaust to compressed gas heat transfer. Recuperator to transfer heat from exhaust gas to compressed air. A recuperated combustion engine transfers exhaust heat to the working gas at the end of compression and at constant volume.
A study by a team from UC Riverside has assessed the potential of increasing ethanol content in California reformulated gasoline (CaRFG) by investigating the exhaust emissions from a fleet of 20 Tier 3 light-duty vehicles. A baseline CaRFG E10 (10% ethanol by volume) fuel was splash-blended with denatured ethanol to create an E15 fuel.
legal light-duty vehicles from 1984 to present. Data has been collected for 23 light-duty vehicles at ORNL’s vehicle research laboratory and a valuable data set for 51 vehicles was loaned to ORNL by Chrysler, LLC under a non-disclosure agreement. Footnotes. [ The other 2 histograms contain data for 74 vehicles. Thomas, H-L.
It provides an air-standard analysis of efficiency, including a comparison to conventional engine technologies. Imagine what you could do with a light weight, quiet, 20 HP diesel engine the size of a shoe box.”. For instance, intake/compression, combustion, expansion/exhaust are occurring simultaneously in separate chambers.
Other research has shown that carbonyls directly influence physiological response to diesel exhaust particles and can also contribute to secondary organic aerosol formation. In the Tianjin study, they team fueled a four-cylinder light-duty diesel engine fueled with CFT and DF, identifying 13 individual carbonyl compounds in the exhaust.
WLTP measurements converted to NEDC values for comparison purposes.) In comparison to its predecessor, the 88 kW/120 hp 1.6-liter In comparison to its predecessor, the 88 kW/120 hp 1.6-liter The NO x adsorber acts as a cold start catalyst, reducing NO x emissions at temperatures below the SCR light-off.
Iveco offers a complete range of light-, medium- and heavy-duty commercial vehicles as well as buses powered by natural gas. Exhaust gas is treated by a standard passive three-way catalyst that does not require the use of any additives. Natural gas PM emissions are 95% lower in comparison to diesel, and 35% lower in NO x.
Their structural characterization was performed at Brookhaven’s Center for Functional Nanomaterials and the National Synchrotron Light Source. Currently, in catalytic convertors used to treat exhaust gases, 5 to 10 grams of platinum is used.
Compared to new diesel engines, the Delphi team found that BSFC for GDCI at light loads was comparable or better, and at high loads was about 5% higher. Due to the lower exhaust enthalpy of lower temperature engines using PPCI, it is difficult to produce intake boost with acceptable boost system parasitis. kWh and FSN 0.1,
As a comparison, in 2007, the first-generation Golf BlueMotion (Volkswagen’s most fuel-efficient version) was regarded as having sensational gas mileage at 52 mpg—4 mpg worse than the new GTD, which has 79 more horsepower and is 25 mph faster. By comparison, the earlier A6 Golf GTD posted 8.1 Variable valve timing.
The data presented in these studies did not show any evidence of deterioration in engine durability or maintenance issues for E15 (or E20) in comparison to E0 and E10 (when tested). Materials compatibility testing provides no evidence that 15 vol% ethanol blends will cause increased rates of metal corrosion in comparison to 10% blends.
For Stingrays equipped with the seven-speed manual transmission, Eco mode enables Active Fuel Management, which disables four of the cylinders for improved fuel economy during light engine loads. The LT1 delivers 460 hp (343 kW) with the available dual-mode exhaust.
Additional benefits in comparison with turbocharger solutions include simpler transient air fuel ration (AFR) control, and reduced thermal inertia in the exhaust, enabling faster catalyst light-off and reduced under hood temperatures.
six-piston) light-duty version of its opposed piston engine (OPE) in both diesel- and gasoline-fueled versions. Achates will demonstrate the engine in 2018 in a driveable light-duty truck. The light-duty engine is a “basic” Achates opposed piston 2-stroke engine, said Redon—i.e., A comparison between the 2.7L
A study by researchers from the University of Denver and the University of Puget Sound indicates that high-mileage light-duty fleets contribute higher emissions and emissions share than expected based on their actual numbers in the fleet. In their study, Bishop et al. —Bishop et al. Bishop, Donald H. Stedman, Daniel A. 6b00717.
At the North American International Auto Show (NAIAS) in Detroit, tier one supplier KSPG is showcasing systems for cars, light and medium-duty commercial vehicles and components for efficient fuel and emission reduction for both gasoline and diesel vehicles. One such measure is cooled exhaust gas recirculation. Click to enlarge.
liter Volkswagen light-duty diesel engine and Klam dynamometer running at various throttle and brake settings over a 9-mode steady-state cycle to enable triplicate time-resolved measurement of particle number distributions with a scanning mobility particle sizer. In the experiments, they used a 4-cylinder, 1.9-liter
The direct comparison of CO 2 or FC standards’ stringencies from different regions not only depends on the different driving cycles applied but also on the technical characteristics of the regional vehicle fleets. WLTC will be replacing NEDC in a few years.). efficient operation strategies such as stop/start systems.
During his presentation at the TDI Efficiency Rally, UMTRI researcher Bruce Belzowski first presented a summary of his analysis of the total cost of ownership of diesels with a comparison to that of their gas vehicle counterparts. Changes in the exhaust manifolds and turbo from Gen 1 to Gen 2. Earlier post.). lbs (4 kg). Q5 hybrid **.
Comparison of Sonata 2.0T Twin-scroll turbocharger designs have two exhaust gas inlets divided by split walls inside the turbine housing, with both gas passages controlled by a waste-gate. A twin-scroll turbo recovers even more energy from the exhaust than a single-scroll turbocharger thanks to a divided manifold. Sonata 2.0T.
Even for consumer light-duty vehicles, particularly larger size passenger vehicles, limited access to charging infrastructure and/or the substantial recharge time may drive continued demand for alternatives. Source-to-Tank cost comparison of carbon-neutral transportation fuels. —Zhao et al. Zhao et al.
Exhaust gases were captured in order to measure the vehicle’s emission of carbon dioxide (CO 2 ) and NO x. Previous testing at SGS provided two sets of baseline results which LH uses for comparison to allow the improvements provided by the hybrid system to be quantified. Source: Lightning Hybrids. Click to enlarge.
Comparison of O 3. In comparison to other iron oxide materials, it has a particularly high proportion of unsaturated and thus reactive iron centers on its surface. removal % of materials at room temperature. A) mesoporous two-line ferrihydrite (M2LFh), B) MSIO, C) CIO, D) g-Fe 2 O 3 , E) 5 wt % Fe/ZSM-5, and F) commercial MnO 2.
A research team from Empa (Swiss Federal Laboratories for Materials Science and Technology) and the University of Applied Sciences Bern, Laboratory for Exhaust Emission Control, reports that ethanol blending appeared to reduce genotoxic emissions from a flex-fuel Euro-5 gasoline direct injection (GDI) vehicle (a Volvo V60 with a 1.6
GM’s eAssist light electrification system—currently offered as the base powertrain in the full-sized 2012 Buick LaCrosse and offered on the 2012 Buick Regal—uses a 115V, 0.5 Calendar life comparison. Input and output power characteristics of 2nd and 3rd generations. Source: Hitachi Review. Click to enlarge.
2WD Pickup truck fuel economy comparisons. To further enhance combustion, the intake and exhaust valve positions have been switched from previous versions, and the valves are now slightly canted toward the cylinder centerline. Fuel economy. Power (hp). Torque (lb-ft). 2014 GMC Sierra. EcoTec3 V-8. 2013 Ford F-150. 2013 Ford F-150.
The recuperated engine uses isothermal compression via cryogenic injection to enable significant exhaust to compressed gas heat transfer. Recuperator to transfer heat from exhaust gas to compressed air. The concept of the Ricardo Split-Cycle engine. Source: Neville Jackson. Click to enlarge.
Comparison of the ML350 BlueTEC diesels. Comparison of the ML350 gasoline engines. A key factor in the diesel engines is also the optimization of the flow and backpressure in the exhaust system with its SCR (Selective Catalytic Reduction) emission control technology. Aerodynamically optimized light-alloy wheels.
The design enables a light, compact unit which provides the strength necessary for the added stresses of diesel combustion, while reducing vibration, noise and internal friction compared to an in-line engine. Cylinder bore spacing is also reduced in comparison—98.4 The boxer diesel is matched to a six-speed manual gearbox.
Emissions from on-road light-duty gasoline vehicles (LDGVs) are a major contributor to secondary organic aerosol (SOA) in urban environments. However, only a small fraction of SOA formed during photo-oxidation of dilute LDGV exhaust in a smog chamber is explained by single-ring aromatic compounds. —Zhao et al. Gutierrez, A.,
A lightweight cylinder head made of pressure-cast aluminum alloy uses front-located exhaust ports that provide greater freedom in the layout of the close-coupled catalytic converter which mounts directly to the cylinder head. included angle between the intake and exhaust valves; the new engine features an included valve angle of 35?.
Ti-VCT gives precise, variable control of valve overlap; such valve overlap management is critical to eliminating intake and exhaust flow compromises. Pistons are cast aluminum, as well, with the light weight helping to reduce reciprocating mass and adding to fuel efficiency.
On 15 Sep, NHTSA and the US EPA proposed a joint rulemaking on fuel economy and greenhouse gas emissions for light duty vehicles: an average new car 34.1 Three of the NHTSA scenarios for penetration of technologies for light trucks for MY 2016. This reduces pumping losses at lighter loads in comparison to a larger engine.
In this study, we present a comprehensive database of emissions from a fleet of GDI- and PFI-equipped light-duty gasoline vehicles tested on a chassis dynamometer over the cold-start unified cycle (UC). Therefore, the secondary organic aerosol and ozone formation potential of the exhaust does not depend on engine technology.
Additionally, suggested one of the speakers, advanced SIDI (spark-ignited, direct-injection) engines can take light-duty market share back from diesels in Europe based on the same trends. Comparison of Emission Standards (g/mi). . don’t think we expect to see a large market share of light duty diesel in the short term.
Comparison of optimized start of injection of advanced diesel combustion for brake thermal efficiency, NO x , PM, THC, and CO of diesel (open bar); HTFT (gray bar); and LTFT (black bar) fuels. In their study, Lilik and Boehman operated a light-duty 2.5L Credit: ACS, Lilik and Boehman. Click to enlarge. —Lilik and Boehman.
Pinnacle says its engine achieves 30-50% better fuel economy in various drive cycle comparisons without the large cost penalty that can be associated with significant fuel economy improvement. The Pinnacle engine using a sliding sleeve valve system: intake liner, exhaust liner, spark plug in the middle.
Further, all the elements of the exhaust aftertreatment system are now configured directly on the engine itself and no longer on the vehicle. All exhaust treatment technologies configured directly on the engine; Significantly lighter and more compact: 168.4 kg vs. 202.8 kg (-17%), two-liter displacement instead of 2.15 Bore (82.0
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