US06
From Wikipedia, the free encyclopedia
| This article is part of a series on |
| Driving cycles |
|---|
| Europe |
|
NEDC: ECE R15 (1970) / EUDC (1990) (UN ECE regulations 83 and 101) |
| United States |
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City test: UDDS (1972) / FTP-75 (1975) Highway test: HWFET (1974) SFTP: US06 / SC03 (2008) |
| Japan |
| 10 mode (1973) / 10-15 Mode (1991) / JC08 (2008) |
| China |
| CLTC (2021) |
| Global Technical Regulations |
| WLTP (2015) (Addenda 15) |
The US06 is a driving cycle representing high speed and aggressive acceleration conditions. It is used by the US Environmental Protection Agency (EPA) to measure tailpipe emissions and fuel economy of passenger cars on a vehicle dynamometer.[1]
The US06 is part of the "Supplemental Federal Test Procedure" (SFTP), which was developed to test driving conditions beyond those encountered in the standard highway (HWFET) and city (FTP-75) driving cycles.[2] In 2008, the EPA added the US06 and SC03 supplemental tests, as well as a cold FTP-75, to the original city and highway tests for determination of vehicle fuel economy.[3]
The UDDS driving schedule (later adapted to the FTP-75) was originally adopted for federal vehicle emissions testing in 1972.[4] However, this driving cycle had a maximum speed of 57 mph, and the acceleration and deceleration rates were artificially reduced to 3.3 mph/sec (1.5 mps2) due to the limited capabilities of the dynamometers in use at the time.[5] By 1990, it was recognized that these limitations meant that a wide swath of in-use vehicle behavior was not adequately captured by the standard dynamometer tests, and the California Air Resources Board began testing to determine the magnitude of the issue.[6]
Over the next few years, the EPA conducted in-use testing in three different cities (Baltimore, Atlanta, and Spokane, Washington) to analyze the frequency of operations outside the FTP envelope. Multiple cycles based on representative sections of on-road driving data were constructed. Of these, a high speed/load transient control cycle, designated as the US06, was chosen as the best cycle to represent behavior not seen on the FTP.[6]
The use of the SFTP (including the US06) for emissions testing was phased in between 2000 and 2004.[7] In 2008, the US06 was added to the tests used to determine vehicle fuel economy as part of the five-cycle test.[3]