Assessment of Fuel Economy Technologies for Light-Duty by National Research Council, Division on Engineering and PDF

By National Research Council, Division on Engineering and Physical Sciences, Board on Energy and Environmental Systems, Committee on the Assessment of Technologies for Improving Light-Duty Vehicle Fuel Economy

A number of mixtures of commercially to be had applied sciences may drastically lessen gasoline intake in passenger automobiles, sport-utility autos, minivans, and different light-duty autos with out compromising automobile functionality or security. evaluate of applied sciences for bettering mild responsibility automobile gasoline economic climate estimates the capability gasoline discounts and prices to shoppers of accessible know-how mixtures for 3 forms of engines: spark-ignition gas, compression-ignition diesel, and hybrid. based on its estimates, adopting the complete blend of greater applied sciences in medium and big vehicles and pickup vans with spark-ignition engines may decrease gasoline intake by way of 29 percentage at an extra rate of $2,200 to the patron. changing spark-ignition engines with diesel engines and elements may yield gasoline reductions of approximately 37 percentage at an further rate of roughly $5,900 according to motor vehicle, and changing spark-ignition engines with hybrid engines and parts would scale back gas intake via forty three percentage at a rise of $6,000 in keeping with car. The booklet makes a speciality of gasoline consumption--the quantity of gasoline ate up in a given using distance--because power rate reductions are without delay relating to the volume of gas used. by contrast, gas economic system measures how a long way a automobile will shuttle with a gallon of gasoline. simply because gas intake info point out funds kept on gasoline purchases and savings in carbon dioxide emissions, the publication reveals that automobile stickers should still supply shoppers with gasoline intake facts as well as gasoline economic climate details.

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Extra resources for Assessment of Fuel Economy Technologies for Light-Duty Vehicles

Sample text

The classification of light trucks was based on structural and design considerations 5 Not only the progress ratio, but also the assumed initial cumulative production (or threshold volume) strongly influences estimated future cost reductions.

One needs to keep in mind that this difference in energy content is one of the reasons why CI engines have lower fuel consumption when measured in terms of gallons rather than in terms of weight. 1 Properties of Fuels FUELS The fuels and the SI and CI engines that use them have co-evolved in the past 100 years in response to improved technology and customer demands. Engine efficiencies have improved due to better fuels, and refineries are able to provide the fuels demanded by modern engines at a lower cost.

All rights reserved. 5) Assessment of Fuel Economy Technologies for Light-Duty Vehicles 21 FUNDAMENTALS OF FUEL CONSUMPTION The brake thermal efficiency is ηb, while ηi is the indicated thermal efficiency, and Hf is the lower heating value of the fuel. This equation provides the means for relating pumping losses, engine friction, and auxiliary load to the overall engine efficiency. Equations for fuel use during braking and idling are not shown here but can be found in Sovran and Blaser (2003), as can the equations for average schedule and maximum engine efficiency.

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