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.
Step2:
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.
Step3:
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.
Step4:
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.
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