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Emission Test Cycles

Nonroad Low Load Cycle (Nonroad LLC)

Time-speed-torque data points

The Nonroad Low Load Cycle is an engine dynamometer test developed at the SwRI for the California Air Resources Board (CARB) for use in Tier 5 emission standards for nonroad engines. The cycle was developed based on real world application cycles and represents nonroad equipment operation with low engine loads and extended idling.

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Figure 1. Nonroad Low Load Cycle (Nonroad LLC)

The Nonroad LLC cycle duration is 4570 seconds and the average power is about 8-10% of the engine maximum power. While not shown in Figure 1, the idle load is 3.5% of the maximum engine power.

Acknowledgement: This article is based on information provided by Chris Sharp of the Southwest Research Institute.