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)." It is used for light duty vehicle testing. The EPA Urban Dynamometer Driving Schedule (UDDS) is commonly called the "LA4" or "the city test" and represents city driving conditions. Graphic Review of Driving SchedulesĮPA Vehicle Chassis Dynamometer Driving Schedules (DDS) - files contain tab delimited ASCII columns The Code of Federal Regulations is the official source of EPA’s vehicle/engine certification test procedures. This page also provides detailed information on those drive schedules in addition to technical information on drive schedules used by states, Europe, and Japan for reference. This page provides the chassis dynamometer driving schedules and shift schedules used by EPA for vehicle emissions and fuel economy testing. Vehicle Chassis Dynamometer Shift Schedule Formatting Guidance.Driving schedules specified in Japanese Technical Standards.Economic Commission for Europe Dynamometer Operating Cycles.California EPA Air Resources Board Dynamometer Driving Schedules. ![]() EPA Vehicle Chassis Dynamometer Driving Schedules.
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