Technologies and Approaches to Reducing the Fuel Consumption by National Research Council, Transportation Research Board,

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

Applied sciences and ways to decreasing the gasoline intake of Medium- and Heavy-Duty autos evaluates quite a few applied sciences and strategies that may enhance the gasoline economic climate of medium- and heavy-duty autos, comparable to tractor-trailers, transit buses, and paintings vans. The publication additionally recommends ways that federal businesses may use to control those cars' gasoline intake. at the moment there aren't any gasoline 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 control the gas financial system of passenger autos. isn't really acceptable for medium- and heavy-duty autos, that are designed in particular to hold rather a lot successfully. as an alternative, any rules of medium- and heavy-duty cars may still use a metric that displays the potency with which a car strikes items or passengers, corresponding to gallons in keeping with ton-mile, a unit that displays the quantity of gasoline a car may use to hold a ton of products one mile. this is often known as load-specific gasoline intake (LSFC). The ebook estimates the advancements that quite a few applied sciences may well in attaining over the following decade in seven motor vehicle forms. for instance, utilizing complicated diesel engines in tractor-trailers may well reduce their gas intake through as much as 20 percentage by means of 2020, and superior aerodynamics may yield an eleven percentage relief. Hybrid powertrains may well decrease the gasoline intake of autos that cease usually, comparable to rubbish vehicles and transit buses, by way of as a lot 35 percentage within the comparable time-frame.

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Extra info for Technologies and Approaches to Reducing the Fuel Consumption of Medium- and Heavy-Duty Vehicles

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It highlights weights, sales volumes and registrations, fuel economy, fuel consumption, mileage, and other information across the various vehicle classes. Even within a class, the range of applications signals the different uses or duty cycles experienced by medium- and heavy-duty vehicles across the transportation sector. These complexities within the industry indicate the difficulties of establishing effective policies to reduce fuel consumption. Medium- and heavy-duty vehicles, defined as Classes 2b through 8, are the workhorses of industry.

Truck and bus manufacturing also accounts for a significant share of national income. According to the same census, light truck and utility vehicle manufacturers have total shipments of $137 billion. Heavy-duty truck manufacturing had sales of $16 billion. Another way to look at the trucking industry’s economic contribution is to compare it with other industries in the transportation sector, in which it accounts for about one-fourth of the sector’s total revenues (see Figure 1-5). 14 TECHNOLOGIES AND APPROACHES TO REDUCING THE FUEL CONSUMPTION OF MEDIUM- AND HEAVY-DUTY VEHICLES FIGURE 1-5 Total revenue of for-hire transportation services compared with revenue of other sectors of the transportation industry, 2002.

This table considers the TABLE 2-10 Validation, Accuracy, and Precision Parameter SAE J1321 EPAMod J1321 Coast Down Wind Tunnel CFD Full-Truck Computer Simulation Accuracy Precision % % % % % % % % % % % % 31 VEHICLE FUNDAMENTALS, FUEL CONSUMPTION, AND EMISSIONS 70 Speed (mph) 60 50 40 30 20 10 0 0 200 400 600 800 1000 1200 Time (s) FIGURE 2-8 The Heavy-Duty Urban Dynamometer Driving Schedule. SOURCE: Clark (2003). Reprinted with permission from SAE. © 2003 SAE International. eps adequacy of influencing parameter control pertinent to each validation process.

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