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Evaluation of the impacts of adaptive cruise control system on improving fuel efficiency of urban road traffic

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Journal of Southeast University(English Edition) 2017年第2期33卷 230-235页

作者：李烨王炜王昊邢璐刘善文东南大学交通学院南京210096 Department of City and Regional Planning University of North Carolina at Chapel Hill

The impact of the adaptive cruise control（ ACC）system on improving fuel efficiency is evaluated based on the vehicle-specific power. The intelligent driver model was first modified to simulate the ACC system and it was calibrated by using empirical traffic data. Then, a five-step procedure based on the vehicle-specific power was introduced to calculate fuel efficiency. Five scenarios with different ACC ratios were tested in simulation experiments, and sensitivity analyses of two key ACC factors affecting the perception-reaction time and time headway were also conducted. The simulation results indicate that all the scenarios with ACC vehicles have positive impacts on reducing fuel consumption. Furthermore, from the perspective of fuel efficiency, the extremely small value of the perception-reaction time of the ACC system is not necessary due to the fact that the value of 0.5 and 0.1 s can almost lead to the same reduction in fuel consumption. Finally, the designed time headway of the ACC system is also proposed to be large enough for fuel efficiency, although its small value can increase capacity. The findings of this study provide useful information for connected vehicles and autonomous vehicle manufacturers to improve fuel efficiency on roadways.

关键词： intelligent transportation system vehicle-specific power fuel efficiency energy connected vehicle automated vehicle

Research on fuel efficiency Design Standard for Commercial Ships in China

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Research on Fuel Efficiency Design Standard for Commercial S...

作者： PENG Chuansheng Waterborne Transport Research Institute of the Ministry of Transport of China

According to a research report issued by International Marine Organization in 2009,coastal and inland river shipping is estimated to have emitted 176 million tons of CO

关键词： ship design fuel efficiency commercial ship standard

Optimal Periodic Control of Hypersonic Cruise Vehicle

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Optimal Periodic Control of Hypersonic Cruise Vehicle

第36届中国控制会议

作者： Wang Wenkai Hou Zhongxi Shan Shangqiu Guo Tianhao Chen Lili College of Aerospace Science and Technology National University of Defense Technology

ISBN: (纸本)9781538629185

Object of this work is hypersonic cruise vehicle which cruises at Mach number beyond 5 in atmosphere. Range of this vehicle is often restricted by the poor aerodynamic, propulsive and structural performances and severe persistent aerodynamic heating. To extend its range, optimal periodic cruise trajectory has been adopted herein to improve fuel efficiency and remit heat accumulation. The performance measure is a weighted combination of the two factors. The simulations show that the two factors are mutually contradicted with variation of weighting factor, and that improvement of aerodynamic heating is much more distinct than that of fuel efficiency. The study on single period is helpful to design the whole flight envelop in future research.

关键词： Hypersonic cruise vehicle fuel efficiency Heat accumulation Optimal periodic cruise trajectory

What does the future bring?A look at technologies for commercial aircraft in the years 2035-2050

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Propulsion and Power Research 2014年第4期3卷 165-174页

作者： Meyer J.Benzakein The Ohio State University ColumbusOhio 43210United States

Demographics and economics in the next 20 years are being ex *** reflect a significant GDP growth and with this a strong demand for commercial aircraft not only in the US and Europe but across Asia and the Middle East The demand will focus on more fuel efficient and more environmentally friendly *** progress is being made with the new regionals,narrow-body,and wide-body aircraft between now and the year *** beyond,the world will examine new airplane architectures,new changes in propulsion systems,and higher thermal and propulsion *** propulsion options will come into *** them,higher operating pressure gas generators will be developed and great attention will have to be given to highly integrated propulsion/airplane *** transfer requirements will lead to bigger gear systems as well as new hybrid *** new machines are forecasted to offer improvements in fuel efficiencies of over 40%.There are many technical challenges to make all these things *** aerospace engineers and scientists of today and tomorrow face unlimited opportunities to make a difference for what looks like a very exciting future.

关键词： fuel efficiency High bypassratio Distributed systems Turbines Propulsion Engines Airplane

Experimental and Simulated Study on the Cylinder Deactivation of Vehicle Gasoline Engine 1

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2016中国汽车工程学会年会暨展览会

作者： Yu Shuhai Ma Xingxing Ma Zhigang LiuRui Song Dongxian Technical Center Great Wall Motor Co.Ltd. Hebei Automobile Engineering Technology & Research Center

ISBN: (数字)9789811035272

ISBN: (纸本)9789811035265;9789811098963

Cylinder deactivation performance in vehicle gasoline engine is investigated by experimental and simulated methods,this technology is implemented by adjusting the valve system,and furthermore,a simulated model is built in GT- *** results show that,in cylinder deactivation mode,the overlap degree of naturally aspirated and effective region is highly,it can be considered that the cylinder deactivation engine just operates in naturally aspirated *** 2bar@2000rpm,BSFC of cylinder deactivation is 312.7g/kW · h,the fuel efficiency is improved 12.6% than normal *** the reduced engine speed,fuel effieiceny becomes better,however,with the increment speed,engine NVH characteristic has been deteriorated.

关键词： cylinder deactivation gasoline engine fuel efficiency torsional fluctuation simulated study

Ashless Multi-Functional Friction Modifier for Modern Engine Oils

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润滑油 2011年第1期26卷 25-30页

作者： Edward Ng BASF South East Asia Pte Ltd

Automotive manufacturers are currently under pressure to improve fuel efficiency,and at the same time,reduce exhaust gas *** meet new emission requirements,modern vehicles are equipped with exhaust gas after-treatment ***,as sulfated ash,phosphorus and sulfur(SAPS) have a detrimental impact on these after-treatment devices,the use of low-or zero-SAPS additives is *** F 10 A is an additive that does not contain any metal,phosphorus or *** enables formulators to develop ...

关键词： fuel efficiency friction modifier oxidation inhibition deposit formation control

Connect & Drive:design and evaluation of cooperative adaptive cruise control for congestion reduction

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Journal of Modern Transportation 2011年第3期19卷 207-213页

作者： Jeroen PLOEG Alex F.A.SERRARENS Geert J.HEIJENK TNO Automotive DTI Automotive Mechatronics Faculty of Electrical Engineering Mathematics and Computer ScienceTwente University

Road throughput can be increased by driving at small inter-vehicle time gaps. The amplification of velocity disturbances in upstream direction, however, poses limitations to the minimum feasible time gap. This effect is covered by the notion of string stability. String-stable behavior is thus considered an essential requirement for the design of automatic distance control systems, which are needed to allow for safe driving at time gaps well below 1 s. Using wireless inter-vehicle communications to provide real-time information of the preceding vehicle, in addition to the information obtained by common Adaptive Cruise Control （ACC） sensors, appears to significantly decrease the feasible time gap, which is shown by practical experiments with a test fleet consisting of six passenger vehicles. The large-scale deployment of this system, known as Cooperative ACC （CACC）, however, poses challenges with respect to the reliability of the wireless communication system. A solution for this scalability problem can be found in decreasing the transmission power and/or beaconing rate, or adapting the communications protocol. Although the main CACC objective is to increase road throughput, the first commercial application of CACC is foreseen to be in truck platooning, since short distance following is expected to yield significant fuel savings in this case.

关键词： cooperative adaptive cruise control (CACC) string stability cooperative driving traffic congestion fuel efficiency

Future Commercial Vehicle Powertrains:Contributions to Sustainable Transportation

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Future Commercial Vehicle Powertrains:Contributions to Susta...

FISITA 2012 World Automotive Congress--Volume 3:Future Automotive Powertrains

作者： Heimo Schreier Lukas Walter AVL List GmbH GrazAustria

Objective Already for many years,fuel consumption and operating cost were the major technology drivers for commercial ***,in order to achieve agreed CO goals and to reduce the dependency on crude oil,governments are implementing CO or fuel consumption *** more,reduction of fuel consumption and consequently low operating costs are continuously an important focus for manufacturers and owners of commercial *** powertrain technologies,which will further reduce fuel consumption,are able to combine these three drivers,to reduce CO emission,to reduce the dependency on crude oil and to address the need of lower total cost of ownership of the owners of commercial *** The efficiency of commercial powertrains can be significantly increased in *** potentials for improvement are seen specifically in those technologies,which are able to provide a global optimum of the whole powertrain system,from engine to exhaust aftcrtreatment to cooling system up to transmission and the final *** total a fuel efficiency potential of20%is seen for long haul *** AVL has developed a whole line of technologies,which can be implemented to the commercial powertrain in the future to address the requirements *** individual measures are the optimization of the balance between engine and aftertreatment systems,reduced engine friction by advanced thermal management systems,reduced parasitic losses of the auxiliaries in real life driving cycles,conversion of exhaust energy in driving power,application of new and advanced transmission technologies and shift strategies as well as degrees of electrification of the ***,alternative fuels provide another field of CO friendly technologies as well as reduced operating *** specifically,the availability of local resources drive short term *** paper will compare the individual saving potentials of these technologies,will rate it against criteria

关键词： Commercial powertrain fuel efficiency CO2 reduction

Tailor-MadeⅥImprovers for Modern fuel Efficient Transmissions

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Tailor-MadeⅥImprovers for Modern Fuel Efficient Transmissio...

中国汽车工程学会燃料与润滑油分会第十四届年会

作者： Jen-Lung Wang Evonik RohMax Oil Additives 723 Electronic DriveHorshamPennsylvania U.S.A.

With increasing sophistication in transmission technology to address the demand for fuel economy improvement and greenhouse gas reduction,it is well recognized that transmission fluid formulation is an integral part of transmission *** is one of the most critical properties in transmission *** fluid viscosity can effectively reduce friction over a wide temperature range,improve fuel economy,increase lifespan of the fluid,and maximize the mechanical benefit of transmission *** (PAMA) viscosity index improver is currently the predominant solution to optimize fluid viscometric performance characteristics,enabling fluid to meet stringent requirement of conventional manual and automatic transmissions. In addition,with its excellent viscosity/temperature response and flexible chemistry,polyalkyl-methacrylate is well suited for lubricants used in the latest transmission technologies,such as double clutch transmission and continuously variable *** paper will first summarize the trend in transmission technology and transmission fluid *** second part of the paper will showcase the performance benefit of PAMA based viscosity index improvers in the lubricants for various types of transmissions,such as meeting stringent OEM viscometric requirement,maintaining proper working viscosity and providing base oil flexibility to oil *** bench test(ARKL test) results will also be presented to illustrate the advantage of PAMA based transmission formulation in improving operation efficiency.

关键词： Polyalkylmethacrylate Viscosity Index Improver Transmission Fluid fuel efficiency