RE: Các bác giúp em với - về vấn đề đo mức tiêu thụ nhiên liệu
Em tìm được một ít thông tin trên trang www.fueleconomy.gov, bác tham khảo nhé.
Fuel economy is measured under controlled conditions in a laboratory using a standardized test procedure specified by federal law. Manufacturers test their own vehicles—usually pre-production prototypes—and report the results to EPA. EPA reviews the results and confirms about 10-15 percent of them through their own tests at the National Vehicles and Fuel Emissions Laboratory.
Estimating MPG (Miles per gallon) with Laboratory Tests
In the laboratory, the vehicle's drive wheels are placed on a machine called a dynamometer that simulates the driving environment—much like an exercise bike simulates cycling.
The energy required to move the rollers can be adjusted to account for wind resistance and the vehicle's weight.
On the dynamometer, a professional driver runs the vehicle through a standardized driving routine, or schedule, which simulates “typical” trips in the city or on the highway.
Each schedule specifies the speed the vehicle must travel during each second in the test.
Right: The driver watches a computerized display that shows his driving statistics compared to the specified schedule.
A hose is connected to the tailpipe to collect the engine exhaust.
The carbon in the exhaust is measured to calculate the amount of fuel burned during the test. This is more accurate than using a fuel gauge.
Bác tham khảo thêm trên Wikipedia nhé, trên này còn một số link nữa, hy vọng hữu ích cho bác http://en.wikipedia.org/wiki/Fuel_economy_in_automobiles
