Browse Topic: Fuel certification

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An Experimental Methodology for Measuring Resistance Forces of Light-Duty Vehicles under Real-World Conditions and the Impact on Fuel Consumption2020-01-038304/14/2020
A vital element of any vehicle-certification test is the use of representative values for the vehicle resistance forces. In most certification procedures, including the WLTP recently adopted by the EU, the latter is achieved mainly through coast down tests. Subsequently, the resistance values measured are used for setting up the chassis-dyno resistances applied during the laboratory measurements. These reference values are obtained under controlled conditions, while a series of corrections are applied to make the test procedure more repeatable and reproducible. In real driving, the actual vehicle road loads are influenced by a series of factors leading to a divergence between the certified fuel consumption values, and the real-world ones. An approach of calculating representative road loads during on-road tests can help to obtain a more unobstructed view of vehicle efficiency and, when needed, confirm the officially declared road loads. This approach is also essential for validating
Komnos, Dimitrios, Fontaras, Georgios, Ntziachristos, Leonidas, Pavlovic, Jelica, Ciuffo, Biagio
Technical Paper
Feasibility Study of Using WLTC for Fuel Consumption Certification of Chinese Light-Duty Vehicles2018-01-065404/03/2018
This paper presents the feasibility study of using the worldwide harmonized light vehicles test cycle (WLTC) for the fuel consumption certification of Chinese Light-duty (LD) vehicles. First, the key steps and the technical routes of the development process of WLTC are summarized. Second, the operation data of 3082 vehicles in 41 typical cities of China are collected throughout the year. Then, the characteristics of the acquisition data are compared with WLTC. Finally, the feasibility of using WLTC for fuel consumption certification of Chinese LD vehicles is analyzed in three aspects, includes operation characteristics, weighting factors and fuel consumption. The result shows that there is obvious difference between WLTC and Chinese reality, and WLTC is not suitable for the fuel consumption certification of Chinese LD vehicles
Liu, Yu, Zhou, Hua, Xu, Yueyun, li, Mengliang, Kongjian, Qin, Yu, Hanzhengnan
Technical Paper
Aviation biofuel effort ramps up10AEMD1013_0110/13/2010
The key to a vibrant aviation biofuels market is a reliable and plentiful supply of nonpetroleum feedstocks. There's a long way to go, but things are coming together for the aviation industry in its push to increase the amount of biofuel it uses. The U.S. agriculture industry is giving the aviation industry an assist in meeting the latter's self-imposed target of carbon-emissions neutrality by 2020. According to Richard Altman, Executive Director of the Commercial Aviation Alternative Fuels Initiative (CAAFI), the goal is to have 10 plants up and running, or close to it, by 2013. There are no production facilities producing aviation biofuel now, though some facilities are producing it in limited amounts for demonstration projects being carried out by airlines and other parties
Ponticel, Patrick
Magazine Article
Straight Alcohol Fuels for General Aviation Aircraft89103804/01/1989
The FAA Technical Center has evaluated straight methanol and ethanol fuels using an aircraft fuel system and engine which were installed on a dynamometer. The results of this program identified the conditions which should be used for hot fuel certification. Stoichiometric air-to-fuel ratios were identified as the most likely to result in either detonation or pre-ignition, and some material compatibility and operational problems were noted. The addition of small amounts of denaturing agents did not adversely affect the vapor lock behavior of the fuels. Straight methyl-tertiary-butyl ether was also evaluated. This material's high octane rating, moderate volatility, and relatively high energy density make it an attractive candidate when compared against either ethanol or methanol
Ferrara, Augusto M.
Technical Paper
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