AS 3584.4:2021 Diesel engine systems for underground coal mines Part 4: Emissions.
1.3.9
high speed
highest engine speed at load where 70 % of the rated power is delivered
1.3.10
intermediate speed
speed used in the NRSC test cycle
Note I to entry: See Clause 2.4.1 for more about intermediate speed.
1.3.11
low speed
lowest engine speed at load where 50 % of the rated power is delivered
1.3.12
may
indicates the existence o1an option
1.3.13
mode
engine operating point characterized by a speed and a torque (or a power output)
Note 1 to entry: This is usually a discrete point in a test cycle at which emissions are measured (see Clause 2.4.1).
1.3.14
non-road steady-state test cycle
NRSC
sequence of discrete engine test modes (see Clause 2.4.2) each with defined speed, torque and weighting factor
Note 1 to entry: The weighting factors only apply if the emission test results are expressed as specific emissions (grams per kilowatt hour).
1.3.15
non-road transient test cycle
NRTC
continuous test cycle that includes a sequence of normalized speed and torque values that vary relatively quickly with time
1.3.16
particulate filter
filter that removes particulate matter from an exhaust gas stream
1.3.17
particulate matter
PM
material collected on the filter medium after diluting exhaust with clean filtered air to a temperature of greater than 315 K (42 °C) and less than or equal to 325 K (52 °C)
Note 1 to entry: This includes organic carbon (OC), elemental carbon (EC), condensed hydrocarbons, polycyclic aromatic hydrocarbons (PA H), trace metals and sulphates with associated water.
1.3.18
powerba nd
engine classification with alphabetical labels based on allowable emission levels
Note 1 to entry: A powerband table for labelling engine systems in accordance with their rated power and corresponding levels of maximum allowable specific emissions is shown in Clause 5.2.1 of UNRO96r3:2014.
2.4 Non road steady-state test cycles
2.4.1 Intermediate speed
The intermediate speed shall meet one of the following requirements:
(a) For engines that are designed to operate over a speed range on a full load torque curve, the intermediate speed shall be the maximum torque speed if it occurs between 60 % and 75 % of rated speed.
(b) If the maximum torque speed is less than 60 % of rated speed, then the intermediate speed shall be 60% of the rated speed.
(c) If the maximum torque speed is greater than 75 % of the rated speed then the intermediate speed shall be 75 % of rated speed. Where the engine is only capable of operation at speeds higher than 75 % of rated speed the intermediate speed shall be the lowest speed at which the engine can be operated.
(d) For engines that are not designed to operate over a speed range on a full-load torque curve at steady-state conditions, the intermediate speed will typically be between 60 % and 70 % of the rated speed.
NOTE For the determination of intermediate speed the maximum torque speed shall be obtained from the
maximum torque curve established from the engine mapping test.AS 3584.4 pdf download.