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By National Research Council, Transportation Research Board, Division on Engineering and Physical Sciences, Board on Energy and Environmental Systems, Committee to Assess Fuel Economy Technologies for Medium- and Heavy-Duty Vehicles

ISBN-10: 0309149827

ISBN-13: 9780309149822

Applied sciences and techniques to decreasing the gasoline intake of Medium- and Heavy-Duty cars evaluates numerous applied sciences and techniques that can enhance the gasoline economic system of medium- and heavy-duty cars, comparable to tractor-trailers, transit buses, and paintings vans. The booklet additionally recommends ways that federal businesses may well use to manage those automobiles' gas intake. presently there aren't any gas intake criteria for such automobiles, which account for roughly 26 percentage of the transportation gasoline utilized in the united states The miles-per-gallon degree used to manage the gasoline financial system of passenger vehicles. isn't really acceptable for medium- and heavy-duty automobiles, that are designed exceptionally to hold quite a bit successfully. in its place, any law of medium- and heavy-duty cars may still use a metric that displays the potency with which a automobile strikes items or passengers, reminiscent of gallons consistent with ton-mile, a unit that displays the quantity of gas a car could use to hold a ton of products one mile. this is often known as load-specific gasoline intake (LSFC). The publication estimates the advancements that numerous applied sciences may perhaps in attaining over the subsequent decade in seven motor vehicle kinds. for instance, utilizing complicated diesel engines in tractor-trailers may decrease their gasoline intake via as much as 20 percentage by way of 2020, and more desirable aerodynamics might yield an eleven percentage aid. Hybrid powertrains may possibly decrease the gasoline intake of autos that cease usually, akin to rubbish vehicles and transit buses, by way of as a lot 35 percentage within the similar time-frame.

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J1263. 30 TECHNOLOGIES AND APPROACHES TO REDUCING THE FUEL CONSUMPTION OF MEDIUM- AND HEAVY-DUTY VEHICLES Physical Testing—Wind Tunnel: SAE J1252 Test Procedure The SAE J1252 test procedure measures aerodynamic drag force directly, from which the Cd is calculated. A wind tunnel is the only accurate method to measure the yaw force and thereby the Cd in yaw. This TP also provides for the calculation of a wind average drag coefficient. The drag curve for a tractor with a 45-ft trailer in Figure 5-7 would have a wind average Cd about 15 percent higher than the 0° Cd.

The figure also shows that a given percentage improvement in fuel economy saves less and less fuel as the baseline fuel economy increases. Each bar represents an increase in fuel economy by 100 percent, which corresponds to a decrease in fuel consumption by 50 percent. The data on the graph show the resulting decrease in fuel consumption per 100 miles and the total fuel saved in driving 10,000 miles. The dramatic decrease in the impact of increasing fuel economy by 100 percent for a high fuel economy vehicle is most visible in the case of increasing the fuel economy from 40 to 80 mpg, where the total fuel saved in driving 10,000 miles is only 125 gallons, compared to 24 TECHNOLOGIES AND APPROACHES TO REDUCING THE FUEL CONSUMPTION OF MEDIUM- AND HEAVY-DUTY VEHICLES FIGURE 2-2 Fuel consumption (FC) versus fuel economy (FE), showing the effect of a 50 percent decrease in FC and a 100 percent increase 2-2fuel FCsaved versus FE, showing the in FE for various values ofFigure FE, including over 10,000 miles.

4) where FE = fuel economy on a given cycle, miles/gallons. It is important to note that the payload of a vehicle significantly affects the fuel economy (FE), fuel consumption (FC), and LSFC as shown in Figures 2-4, 2-5, and 2-6. These results are from simulations for a line-haul vehicle and an urban delivery vehicle in operations based on real-world routes recorded by Cummins. Table 2-9 shows a few of the variables used for the simulations in Figures 2-4 through 2-6. , communication, June 6, 2009.

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Technologies and Approaches to Reducing the Fuel Consumption of Medium- and Heavy-Duty Vehicles by National Research Council, Transportation Research Board, Division on Engineering and Physical Sciences, Board on Energy and Environmental Systems, Committee to Assess Fuel Economy Technologies for Medium- and Heavy-Duty Vehicles


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