Code of Federal Regulations (Last Updated: November 8, 2024)

Title 40 - Protection of Environment

Chapter I - Environmental Protection Agency

SubChapter U - Air Pollution Controls

Part 1036 - Control of Emissions from New and in-Use Heavy-Duty Highway Engines

Appendix B to Part 1036 - Transient Duty Cycles

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Appendix B to Part 1036 - Transient Duty Cycles

(a) This appendix specifies transient duty cycles for the engine and powertrain testing described in § 1036.510, as follows:

(1) The transient duty cycle for testing engines involves a schedule of normalized engine speed and torque values.

(2) The transient duty cycles for powertrain testing involves a schedule of vehicle speeds and road grade. Determine road grade at each point based on the peak rated power of the powertrain system, P_rated, determined in § 1036.527 and road grade coefficients using the following equation:

(b) The following transient duty cycle applies for spark-ignition engines and powertrains:

(c) The following transient duty cycle applies for compression ignition engines and powertrains:

[86 FR 34408, June 29, 2021]

                    
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