Large Spark-Ignition Nonroad Transient Cycle (LSI-NRTC)

The LSI-NRTC test is a transient driving cycle used internationally for emission certification of mobile, spark-ignited nonroad engines such as those used in forklifts and other industrial, agricultural, and construction equipment with a maximum power rating typically between 19 kW (25 hp) and 560 kW (750 hp). The LSI-NRTC test cycle is defined by the ISO 8178-4 standard as well as by the EU Stage V emission regulation and emission regulations in other countries. The test is intended for engines that are also subject to the ISO 8178 C2 steady-state cycle.

The LSI-NRTC is an engine dynamometer transient driving schedule of total duration of 1,209 seconds. The normalized engine speed and torque during the LSI-NRTC test are shown in the following chart.

The transient test cycle is run once, from a hot start, after completion of a pre-conditioning sequence that includes operation of the test engine for the first 180 s of the duty cycle, followed by idle without load for 30 s. Emissions are not measured during this warm-up sequence.

Brake specific emissions are expressed in g/kWh, or number per kilowatt-hour (#/kWh) for particle numbers (PN).