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Federal Test Procedure Revisions
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Summary
On October 22, 1996, the final rule on Motor Vehicle Emissions Federal Test Procedure Revisions was published in the the Federal Register. This rule revises the tailpipe emissions portion of the Federal Test Procedure (FTP) for light–duty vehicles (LDVs) and light–duty trucks (LDTs). The primary new element of the rulemaking is a Supplemental Federal Test Procedure (SFTP) designed to address shortcomings with the current FTP in the representation of aggressive (high speed and/or high acceleration) driving behavior, rapid speed fluctuations, driving behavior following startup, and use of air conditioning. An element of the rulemaking that also affects the preexisting "conventional" FTP is a new set of requirements designed to more accurately reflect real road forces on the test dynamometer.
NOTE: You will need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader.
Information is available on:
- Notice of Proposed Rulemaking
- Phoenix Air Conditioning Study
- FTP Preliminary Technical Report
- Driving cycles
- Emission Standards
Final Rule
- Final Rulemaking, Motor Vehicle Emissions Federal Test Procedure Revisions
Notice of Proposed Rulemaking
- 1/95 FTP Revisions NPRM - Preamble (PDF) (118K)
- 1/95 FTP Revisions NPRM - Proposed Regulations (PDF) (114K)
- 1/95 FTP Revisions- Detailed Support Document (PDF) (225K)
- 1/95 FTP Revisions- Regulatory Impact Analysis (PDF) (78K)
- 4/95 Transcript of public hearing on NPRM
- Volume 1 (PDF) (383K)
- Volume 2 (PDF) (382K)
- 1/95 Technical Support Documents
Phoenix Air Conditioning Study
In order to understand more about customer use of air conditioning and the impact of meteorological parameters (temperature and humidity in particular) on air conditioning use and the air conditioner compressor (and therefore on emissions), an EPA contractor (ATL) performed an in-use survey of air conditioning use in Phoenix, Arizona, in 1994. Twenty vehicles were instrumented with dataloggers for periods of 1-2 weeks, and data was collected on several air conditioner and trip parameters. Data was recorded for more than 1000 trips.
- Air Conditioning Survey Data, Phoenix AZ (XLS) (245K) (also available as CSV file, 94K)
- Ozone/Weather Data - 5yrs 44 cities (TXT) (168K)
FTP Preliminary Technical Report
In May 1993 EPA published a report titled, "Federal Test procedure Review Project: Preliminary Technical Report," ( EPA 420-R-93-007). The title is a slight misnomer in that there was not a "final" report. Rather, the preliminary report served as the technical basis for moving forward with the development of the FTP revisions rulemaking.
- FTP Review: Executive Summary (TXT) (18K)
- FTP Review Preliminary Tech Report (PDF) (1.2MB)
- FTP Review Report Appendices (PDF) (175K)
- Status Report- Review of Federal Test Procedure (PDF) (55K)
Driving cycles
The FTP Revisions regulations include two new driving cycles.
- SC03 Driving Cycle, per 8/96 Final Rule (TXT) (5K) (also available as GIF file, 19K)
- US06 Driving Cycle, per 8/96 Final Rule (TXT) (6K) (also available as GIF file, 19K)
The standard driving cycle, the urban dynamometer driving schedule (UDDS) is still a required element of the federal test procedure (FTP):
- Urban Dynamometer Driving Schedule (TXT) (18K) (also available as GIF file, 19K)
- FTP Driving Schedule (TXT) (18K) (also available as GIF file, 19K and as procedure timeline JPG file, 19K)
