Duty Cycles for Laboratory Testing

(a) Test handheld engines with the following steady-state duty cycle: Table 1 to Appendix B—Duty Cycle for Handheld Engines G3 mode No. Engine speed a Torque (percent) b Weighting factors 1 Rated speed 100 0.85 2 Warm idle 0 0.15 a Test engines at the specified speeds as described in § 1054.505. b Test engines at 100 percent torque by setting operator demand to maximum. Control torque during idle at its warm idle speed as described in 40 CFR 1065.510. (b) Test nonhandheld engines with one of the following steady-state duty cycles: (1) The following duty cycle applies for engines designed to idle: Table 2 to Appendix B—Duty Cycle for Nonhandheld Engines With Idle G2 Mode No. a Torque (percent) b Weighting factors 1 100 0.09 2 75 0.20 3 50 0.29 4 25 0.30 5 10 0.07 6 0 0.05 a Control engine speed as described in § 1054.505. Control engine speed for Mode 6 as described in § 1054.505(c) for idle operation. b The percent torque is relative to the value established for full-load torque, as described in § 1054.505. (2) The following duty cycle applies for engines that are not designed to idle: Table 3 to Appendix B—Duty Cycle for Nonhandheld Engines Without Idle Mode No. a Torque (percent) b Weighting factors 1 100 0.09 2 75 0.21 3 50 0.31 4 25 0.32 5 10 0.07 a Control engine speed as described in § 1054.505. b The percent torque is relative to the value established for full-load torque, as described in § 1054.505. [88 FR 4668, Jan. 24, 2023]