By Doubei - 18.02.2020
Wcx digital summit 2020
Sign-up now to watch a replay of our previously held SAE Leadership Roundtable Series webcasts originally scheduled for WCX World Congress. Title, WCX Digital Summit. Dates, June Location, Online & On-Demand Event. Organised by, SAE International.
The following summary details a number of WCX papers—most of which, but not all, were presented at the Digital Summit—on engines, engine emissions, and related technologies.
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The stage was set for these topics by Ameya Joshi of Corning, who presented a review of recent regulatory and technical developments in vehicle efficiency and emission control technologies . The EU CO2 targets have attracted a lot of attention due to their Wcx digital summit 2020 character, but they also drive advancement in internal combustion engines.
Conference report: SAE WCX 2020 Digital Summit
In both regulations, the focus wcx digital summit 2020 to ensure low emission levels for NOx and other pollutants under all real driving conditions, including slow urban driving. A number of regulatory changes are read more in Wcx digital summit 2020.
Even before the Euro 7 stage, the particle number measurement will likely be modified to include smaller particles, down to 10 nm from the current 23 nm. PFI engines can produce high PN emissions, especially in hybrid powertrains, due to frequent engine stop-starts. If an NH3 emission limit is adopted, gasoline engines may require a passive SCR catalyst or an ammonia slip catalyst.
High Efficiency Engines The summit included a number of presentations on high efficiency engine concepts and various approaches to improving engine efficiency.
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The focus of most of these papers was for light-duty SI engines. Hybridization offers opportunities to further improve ICE efficiency. For wcx digital summit 2020, low speed torque requirements in SI engines are commonly met through compromises such as reduced compression ratio that affect efficiency over the entire engine map.
With a hybrid drive powertrain, even 5 kW of crankshaft assist at these low speeds can reduce the low speed torque required from the ICE that can enable the use of a higher compression ratio and allow the turbocharger to be re-optimized.
Near rated power conditions, the re-optimized wcx digital summit 2020 can lower residual gas fraction and allow combustion phasing to be advanced and enrichment to be reduced to considerably lower fuel consumption and CO just click for source while maintaining rated power and exhaust temperature limits.
Wcx digital summit 2020 1. Thus, while the Hybrid EV strategy may be appropriate for vehicles operating under relatively light engine loads such wcx digital summit 2020 that experienced by passenger vehicles in urban driving, the Hybrid Boost strategy can provide larger fuel economy gains for highly loaded vehicle operation.
GM is developing a pragmatic engine concept that maximizes efficiency and minimizes https://catalog-id.ru/2020/justice-r-all-in.html emissions through aggressive downsizing, exhaust energy recovery and a multi-mode combustion system .
The design has 3-cylinders of which two provide power while the third one is used for exhaust compounding, Figure 2.
Brake thermal efficiency BTE of The wcx digital summit 2020 efficiency was obtained over a wide load range relevant for typical drive cycles.
Figure 2. From about bar Https://catalog-id.ru/2020/ripple-projections-2020.html, the combustion process wcx digital summit 2020 based on a double injection strategy that creates into a quasi-homogeneous background, a richer region that is ignited by the spark-plug mixed-mode https://catalog-id.ru/2020/price-of-bitcoin-january-2020.html. Combustion of the richer region raises the temperature and pressure in the cylinder and triggers autoignition of the background mixture.
Wcx digital summit 2020 phasing is controlled by varying the NVO duration and in the low load region of mixed mode combustion, spark timing can be varied as well. A low-lift cam profile is used for the intake and exhaust and the expander cylinder is bypassed during NVO operation.
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At about 5. Simultaneously, exhaust from the power cylinders is directed into the expander cylinder.
Under these conditions, exhaust re-breathing is used to stabilize combustion. In the higher load range of mixed-mode combustion, rebreathing is no longer required. While dilute combustion modes use a Michigan Technological University and Roth Engine Science summarized click results for wcx digital summit 2020 example implementation of the true 2020 bitcoin 1 million Cycle using a multi-link mechanism in a light-duty SI engine .
Wcx digital summit 2020 light to medium load conditions, the efficiency benefit derives almost exclusively from overexpansion. However, at higher loads, additional benefits arise because spark timing can be better optimized for efficiency while avoiding knock.
This compares with At higher loads, a third benefit arises from the ability to meet exhaust temperature limits with little or no enrichment.
Another overexpansion concept proposed by EcomanIQ uses deactivated cylinders to achieve overexpansion at part load . At part load conditions where some cylinders can wcx digital summit 2020 deactivated, the non-firing cylinders are used to further expand exhaust gas from the firing cylinders.
In a second paper using a passive prechamber, stoichiometric operation over continue reading entire engine load range was targeted while keeping wcx digital summit 2020 cost increases to a minimum .
The concept used increased compression ratio, Miller cycle valve timing and low pressure EGR, port fuel injection and a variable geometry turbocharger. When optimized as an engine for a hybrid wcx digital summit 2020 using a A paper by the University of South Australia demonstrated some interesting aspects of exhaust waste heat recovery for a stationary genset .
GT Presentations at SAE WCX Digital Summit
They carried out some detailed sizing calculations for wcx digital summit 2020 WHR system for a 1. Wcx digital summit 2020 a The mass of the genset is about Thermal Management Thermal management strategies will be critically important for meeting the proposed California lower NOx emission standards for heavy-duty engines.
The LLC cycle provides very wcx digital summit 2020 enthalpy to the aftertreatment system—in fact, the exhaust produced during low load operation will actively cool down components that were initially warm.
Research at the SwRI—conducted as part of the low NOx diesel engine demonstration for California—strongly suggests the NOx emission targets can be met using a dual dosing SCR configuration in combination with cylinder deactivation CDA and additional engine measures to ensure rapid engine warming after cold start  .
Aftertreatment aging is still on-going and final results should budget rig 2020 available later this year.
Wcx digital summit 2020 conducted a simulation study of a heavy-duty aftertreatment system, and proposed an alternative thermal management approach to meet the California lower NOx emission standards .
Two thermal management strategies were examined, including a mini fuel burner and an electric exhaust heater. The fuel burner was able to meet the system objectives on the LLC cycle while utilizing an average 7.
Wcx digital summit 2020 the mini-burner was combined with CDA, the fuel consumed by the mini-burner was reduced by 2.
The electric exhaust heater, even though limited in maximum power relative to wcx digital summit 2020 mini-burner, was also able to satisfy the thermal deficit of the LLC cycle.
These results suggest that the combination of mini-burner or an electric heater and CDA may present a viable alternative to the configuration wcx digital summit 2020 by the SwRI. Of course, the mini-burner consumes more fuel than cylinder deactivation which actually saves fuel.
However, CDA alone is insufficient during cold start, and the additional engine measures that must be used to heat the aftertreatment system may very well consume more fuel than the mini-burner.
In addition to the conventional heavy-duty aftertreatment configuration, the Tenneco study also includes an this web page of a system with dual dosing SCR.
Three cylinders were deactivated using a calibration that was click of some initial performance wcx digital summit 2020 activity for the SuperTruck II program. For most of the low load cycles tested, the engine operated in CDA mode for most of the cycle.
The results presented were for warmed-up engine operation—i. The highest NOx and CO2 reductions tended to be found for the cycles that operated at the lowest loads.
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For the heavy-duty systems being developed, CDA is unable to significantly accelerate aftertreatment system warm-up after a cold start and more conventional strategies that also consume significant amounts of fuel may still be required for this task. Using a light duty 4-cylinder SI engine 1.
DSF increases the load on the firing wcx digital summit 2020 and allows more combustion phasing retard before combustion instability becomes too high.
The higher cylinder load also allows intake cam phasing to be advanced to increase residual fraction and provide some emission benefits without degrading combustion stability. All of the tested, aged configurations could comfortably meet the relevant PN as well as HC emission limits.SAE WCX 20 - \
Bigger TWC volume i. An interesting case study by Cummins evaluated the catalytic performance of a sulfur-poisoned Cu-SSZ SCR catalyst that had been exposed to high sulfur diesel fuel . It was found that both physical poisoning by ammonium bisulfate ABS and chemical poisoning Cu-S species contributed wcx digital summit 2020 the reduced NOx conversion.
Catalyst activity could be partially restored after exposure to high temperatures. Industrial Power Alliance and the University of Michigan investigated EGR cooler deposits from non-road diesel fueled equipment . The EGR coolers from construction vehicles that had accumulated over 10,h of operation were removed and analyzed.
They discovered that the density of the field aged deposit samples was over 5 times higher when compared to typical samples generated on an engine bench and that the mass and density of deposits wcx digital summit 2020 the outlet end wcx digital summit 2020 the cooler was wcx digital summit 2020 than at the inlet side.
More info most cases, the outlet deposits contained a wcx digital summit 2020 proportion of volatiles.
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