{"data":{"id":"us/40-cfr-appendix-b-to-part-1036","jurisdiction":"us","citation":"40 CFR Appendix B to Part 1036","heading":"Appendix B to Part 1036—Transient Duty Cycles","body":"(a) This appendix specifies transient test intervals and duty cycles for the engine and powertrain testing described in §§ 1036.512 and 1036.514, as follows:\n(1) The transient test intervals and duty cycle for testing engines involves a schedule of normalized engine speed and torque values.\n(2) The transient test intervals and 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, Prated, determined in § 1036.520 and road grade coefficients using the following equation: Road grade = a · P 2rated + b · Prated + c\n(3) The operating schedules in this appendix in some cases eliminate repetitive information by omitting 1 Hz records where there is no change in values. Perform testing by continuing to operate at the last specified values until the operating schedule shows a change in values. The official operating schedule for testing, cycle validation, and other purposes includes both the specified and omitted values.\n(b) The following transient test interval applies for spark-ignition engines and powertrains when testing over the duty cycle specified in § 1036.512:\nTable 1 of Appendix B—Transient Test Interval for Spark-Ignition Engines and Powertrains Under § 1036.512\n(c) The following transient test interval applies for compression-ignition engines and powertrains when testing over the duty cycle specified in § 1036.512:\nTable 2 of Appendix B—Transient Test Interval for Compression-Ignition Engines and Powertrains Under § 1036.512\n(d) The following transient duty cycle applies for compression-ignition engines and powertrains when testing under § 1036.514:\nTable 3 of Appendix B—Transient Duty Cycle for Compression-Ignition Engines and Powertrains Under § 1036.514","path":["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"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"bc7269535db4827007737ee86af830946a2d5af3026e0ab2758eb671799d0153","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-appendix-a-to-part-1036","next":"us/40-cfr-appendix-c-of-part-1036"},"notice":"GroundRules: Original legal text. Not legal advice."}