The Highway Fuel Economy Dynamometer Procedure consists of driving the test vehicle over two highway driving cycles with fifteen seconds of idle between them. The first cycle is for preconditioning and the second is for fuel economy determination. This procedure is designed to follow the Federal Emission Test Procedure. If, however, it cannot be scheduled within three hours of the FTP, the vehicle will be re-driven over one cycle of the EPA Urban Dynamometer Driving Schedule, known as the LA-4, before running the two highway driving cycles. Since the vehicles are driven either over a FTP or a LA-4 prior to the highway fuel economy test, the vehicles may already be in a stabilized condition during the first cycle. Therefore, a study was conducted to determine if it is necessary to run the second highway cycle. This report presents summary statistics of the absolute and relative % differences between the fuel economy determinations of the two cycles and compares these differences to the time elapsed between the end of the FTP (or LA-4) and the start of the highway test.
Comparison of Fuel Economy Values from the Preconditioning and Measuring Cycles of the Highway Fuel Economy Test Procedures
1978
18 pages
Report
No indication
English
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