Steady-State Duty Cycles

(a) The following duty cycles apply as specified in § 1042.505(b)(1): (1) The following duty cycle applies for discrete-mode testing: E3 mode No. Engine speed 1 Percent of maximum test power Weighting factors 1 Maximum test speed 100 0.2 2 91% 75 0.5 3 80% 50 0.15 4 63% 25 0.15 1 Maximum test speed is defined in 40 CFR part 1065. Percent speed values are relative to maximum test speed. (2) The following duty cycle applies for ramped-modal testing: RMC mode Time in mode (seconds) Engine speed 1 3 Power (percent) 2 3 1a Steady-state 229 Maximum test speed 100%. 1b Transition 20 Linear transition Linear transition in torque. 2a Steady-state 166 63% 25%. 2b Transition 20 Linear transition Linear transition in torque. 3a Steady-state 570 91% 75%. 3b Transition 20 Linear transition Linear transition in torque. 4a Steady-state 175 80% 50%. 1 Maximum test speed is defined in 40 CFR part 1065. Percent speed is relative to maximum test speed. 2 The percent power is relative to the maximum test power. 3 Advance from one mode to the next within a 20 second transition phase. During the transition phase, command a linear progression from the torque setting of the current mode to the torque setting of the next mode, and simultaneously command a similar linear progression for engine speed if there is a change in speed setting. (b) The following duty cycles apply as specified in § 1042.505(b)(2): (1) The following duty cycle applies for discrete-mode testing: E5 mode No. Engine speed 1 Percent of maximum test power Weighting factors 1 Maximum test speed 100 0.08 2 91% 75 0.13 3 80% 50 0.17 4 63% 25 0.32 5 Warm idle 0 0.3 1 Maximum test speed is defined in 40 CFR part 1065. Percent speed values are relative to maximum test speed. (2) The following duty cycle applies for ramped-modal testing: RMC mode Time in mode (seconds) Engine speed 1 3 Power (percent) 2 3 1a Steady-state 167 Warm idle 0. 1b Transition 20 Linear transition Linear transition in torque. 2a Steady-state 85 Maximum test speed 100%. 2b Transition 20 Linear transition Linear transition in torque. 3a Steady-state 354 63% 25%. 3b Transition 20 Linear transition Linear transition in torque. 4a Steady-state 141 91% 75%. 4b Transition 20 Linear transition Linear transition in torque. 5a Steady-state 182 80% 50%. 5b Transition 20 Linear transition Linear transition in torque. 6 Steady-state 171 Warm idle 0. 1 Maximum test speed is defined in 40 CFR part 1065. Percent speed is relative to maximum test speed. 2 The percent power is relative to the maximum test power. 3 Advance from one mode to the next within a 20 second transition phase. During the transition phase, command a linear progression from the torque setting of the current mode to the torque setting of the next mode, and simultaneously command a similar linear progression for engine speed if there is a change in speed setting. (c) The following duty cycles apply as specified in § 1042.505(b)(3): (1) The following duty cycle applies for discrete-mode testing: E2 mode No. Engine speed 1 Torque (percent) 2 Weighting factors 1 Engine Governed 100 0.2 2 Engine Governed 75 0.5 3 Engine Governed 50 0.15 4 Engine Governed 25 0.15 1 Speed terms are defined in 40 CFR part 1065. 2 The percent torque is relative to the maximum test torque as defined in 40 CFR part 1065. (2) The following duty cycle applies for ramped-modal testing: RMC mode Time in mode (seconds) Engine speed Torque (percent) 1 2 1a Steady-state 229 Engine Governed 100%. 1b Transition 20 Engine Governed Linear transition. 2a Steady-state 166 Engine Governed 25%. 2b Transition 20 Engine Governed Linear transition. 3a Steady-state 570 Engine Governed 75%. 3b Transition 20 Engine Governed Linear transition. 4a Steady-state 175 Engine Governed 50%. 1 The percent torque is relative to the maximum test torque as defined in 40 CFR part 1065. 2 Advance from one mode to the next within a 20 second transition phase. During the transition phase, command a linear progression from the torque setting of the current mode to the torque setting of the next mode. [81 FR 74156, Oct. 25, 2016]