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Dynamometer Driver's Aid
Please Note:
- The Code of Federal Regulations is the official source of vehicle/engine certification test procedures.
- Vehicle Chassis Dynamometer Driving Schedules
- Vehicle Chassis Dynamometer Shift Schedule Formatting Guidance
- Engine Brake Dynamometer Duty Cycles
Quick Graphic Review of Driving Schedules
- See a quick graphical review of vehicle chassis dynamometer driving schedules utilized at the National Vehicle and Fuel Emissions Laboratory.
EPA Dynamometer Driving Schedules (DDS) - files contain tab delimited ASCII columns
- The EPA Inspection and Maintenance (IM240) is often used for road-side vehicle testing.
- im240col.txt (12K)
- The EPA Urban Dynamometer Driving Schedule (UDDS) is commonly called the "LA4" or "the city test" and represents city driving conditions. It is used for light duty vehicle testing. The UN/ECE Regulation 53 refers to the EPA UDDS as the "Test Equivalent to the Type 1 Test (verifying emissions after a cold start)".
- uddscol.txt (12K)
- The Federal Test Procedure(FTP) is composed of the UDDS followed by the first 505 seconds of the UDDS. It is often called the EPA75. The dynamometer portion of the test procedure has a very complex timeline of events.
- ftpcol.txt (18K)One Hertz text file
- ftp10hztable.txt (98K) Ten Hertz text file
- ftp10hztable.xls (193K) Ten Hertz MS Excel file
- The Highway Fuel Economy Driving Schedule (HWFET) represents highway driving conditions
under 60 mph.
- hwycol.txt (8K)
- hwy10hztable.txt (90K) Ten Hertz text file
- hwy10hztable.xls (161K) Ten Hertz MS Excel file
- The New York City Cycle (NYCC) features low speed stop-and-go traffic conditions.
- nycccol.txt (5K)
- The US06 is a high acceleration aggressive driving schedule that is often identified as the "Supplemental FTP" driving schedule.
- us06col.txt (6K, Updated 10/01/99)
- The SC03 is the Air Conditioning "Supplemental FTP" driving schedule.
- sc03col.txt (5K, Updated 10/01/99)
- The EPA The Heavy Duty Urban Dynamometer Driving Schedule is for heavy duty vehicle testing. Be careful! Do not confuse it with the usual UDDS for light duty vehicle testing.
- huddscol.txt (20K)
California EPA Air Resources Board Dynamometer Driving Schedules
- The Air Resources Board LA92 Dynamometer Driving Schedule, often called the Unified driving schedule, was developed as an emission inventory improvement tool. Compared to the FTP, the LA92 has a higher top speed, a higher average speed, less idle time, fewer stops per mile, and a higher maximum rate of acceleration.
- la92dds.txt (26K)
- The LA92Short contains the first 969 seconds of the LA92 (Unified) Dynamometer Driving Schedule.
- la92shortdds.txt (18K)
- For more information, leave the U.S. EPA web site and go to The California EPA Air Resources Board
Economic Commission for Europe Dynamometer Operating Cycles - Official guidance is found in the United Nations Economic Commission for Europe (UN/ECE) WP.29 1958 Agreement and its Addenda. Guidance is specifically found in Regulation 83 of the Regulations for the Construction of Vehicles.
- The UN/ECE Elementary Urban Cycle is Part 1 of the ECE Type 1 Test.
- ececol.txt (20K)
- The UN/ECE Extra-Urban Driving Cycle is Part 2 of the ECE Type 1 Test.
- eudccol.txt (20K)
- The UN/ECE Extra-Urban Driving Cycle (Low Powered Vehicles) is an alternative for Low-Powered Vehicles for Part 2 of the ECE Type 1 Test.
- eudccol.txt (20K)
Driving schedules specified in Japanese Technical Standards - Official guidance is found in the Japanese Industrial Safety and Health Association (JISHA) Technical Standards. The 11 Mode and 13 Mode driving schedules are not yet available for posting. Technical Guidances Include:
- Rev. 11-4-28 Technical Standard for 10¥15-Mode Exhaust Emission Measurement for Gasoline-Fueled Motor Vehicles (Jisha 899, 1983)
- Rev. 11-4-29 Technical Standard for 10-Mode and 11-Mode Exhaust Emission Measurement for Gasoline-Fueled Motor Vehicles (Jisha 899, 1983)
- Rev. 11-4-30 Technical Standard for 13-Mode Exhaust Emission Measurement for Gasoline-Fueled Motor Vehicles (Jisha 899, 1983)
- Rev. 11-4-31 Technical Standard for 10.15-Mode Exhaust Emission Measurement for Diesel-Powered Motor Vehicles (Jisha 899, 1983)
- Rev. 11-4-32 Technical Standard for 10-Mode Exhaust Emission Measurement for Diesel-Powered Motor Vehicles (Jisha 899, 1983)
- Rev. TRIAS 5-2-1990 10-Mode Fuel Economy Test Procedure for Gasoline-Fueled Motor Vehicles
- Rev. TRIAS 5-3-1991 Technical Standard for 10.15- Fuel Economy Test Procedure for Gasoline-Fueled Motor Vehicles
- The Japanese 10 Mode Cycle is used as a component of the total driving schedule for the 10.15 Mode Exhaust Measurement and Fuel Economy Test Procedures.
- jpn10col.txt (7K)
- The Japanese 15 Mode Cycle is used as a component of the total driving schedule for the 10.15 Mode Exhaust Measurement and Fuel Economy Test Procedures.
- jpn15col.txt (2K)
- The Japanese 10.15 Mode Driving Schedule for Exhaust Measurement and Fuel Economy Test Procedures are specified in Jisha Technical Standards (Jisha 899, 1983).
- j1015col.txt (2K)
Shift Schedule Formatting Guidance
- Certification Fuel Economy Information System guidance for the CFEIS Shift Schedule format may be obtained in the document "Shift Schedule Input Data Record Layout (PDF) " (10 pp, 68K, About PDF)
- Graphics images and one hertz text files for the driver's traces for the FTP, HWFET and other drive schedules are available on this page.
- 10 Hertz Text Files for some of traces are also available on this page.
- Sample Formatting Tool (44K, XLS) for putting shift schedule data into the CFEIS shift schedule format.
- Draft Guidance for submission of shift schedules to the NVFEL. (8K, TXT)
- Example EPA 5 speed FTP, HWFET and US06 shift schedules are in the following files.
- ftp5spd.txt (2K)
- hwy5spd.txt (2K)
- us065spd.txt (2K)
EPA Non regulatory Nonroad Engine Duty Cycles
- Engine Duty Schedules (cycles) provide engine speed and torque vs time for agricultural tractor, backhoe, crawler tractor, excavator, arc welder, skid steer loader, and wheel loader.
For further information or assistance regarding this web page, please contact Bill Courtois, phone: (734) 214-4352 or email: courtois.william@epa.gov.