AS ISO 9249 pdf download

AS ISO 9249 pdf download.Earth-moving machinery — Engine test code — Net power
1  Scope
This International Standard specifies a method for testing the net power of internal combustion engines intended for the propulsion of earth-moving machinery as defined in ISO 6165. It is intended to provide a standardized means of reporting net power values to the end user of the earth-moving machines. It is applicable to a) RIC spark- or compression-ignition engines but excluding free piston engines, b) rotary piston engines. These engines may be naturally aspirated or pressure-charged using either a mechanical pressure- charger or a turbocharger. NOTE  This International Standard is a companion standard to ISO 14396. The principle differences between the two is the fitting of certain cooling equipment and pressure-charging equipment auxiliaries (fans) for the test. It is possible to deduct the power requirements of equipment and auxiliaries from the engine ratings of ISO 14396 by test or calculation methods. See Annex A for the preferred calculation method for obtaining the net power ratings according to this International Standard. Both the test and the calculation method comply with this International Standard.
3  Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the symbols and abbreviated terms given in ISO 15550 and the following terms and definitions apply. 3.1 declared engine speed engine speed corresponding to the declared power Note 1 to entry: In some applications, the declared engine speed is named “rated speed”. [SOURCE: ISO 15550:2002, definition 3.2.4] 3.2 declared power value of the power, declared by the manufacturer, which an engine will deliver under a given set of circumstances Note 1 to entry: In some applications, the declared power is named “rated power”. [SOURCE: ISO 15550:2002, definition 3.3.1] 3.3 engine adjustment physical procedure of modifying an engine for the purpose of adapting it to deliver a power adjusted to a different set of ambient conditions, such as by moving the limiting fuel stop, re-matching the turbocharger, changing the fuel injection timing or other physical changes Note 1 to entry: Once the modifications have been completed the engine is an adjusted engine. [SOURCE: ISO 15550:2002, definition 3.2.1] 3.4 engine speed number of revolutions of the crankshaft in a given period of time [SOURCE: ISO 2710-1:2000, definition 11.1] 3.5 fuel delivery metered volume (mass) of fuel delivered by a fuel injection system during one working cycle Note 1 to entry: Adapted from ISO 7876-1:1990, definition 10.24. 3.6 load general term describing the magnitude of the “power” or “torque” demanded from the engine by its driven machinery and usually expressed relative to a declared power or torque Note 1 to entry: The term “load” is physically imprecise and should be avoided. For quantitative purposes the terms “power” or “torque” should be used, instead of “load”, together with a statement of speed. [SOURCE: ISO 15550:2002, definition 3.3.11] 3.7 net power power obtained on a test bed at the end of the crankshaft or its equivalent, at the corresponding engine speed, with the equipment and auxiliaries listed in ISO 15550:2002, Table 1, column 2, and required in column 3 (fitted for engine net power test) Note 1 to entry: If the power measurement can only be carried out with a mounted gearbox, the losses in the gearbox should be added to the measured power to give the net engine power. Note 2 to entry: Adapted from ISO 15550:2002, definition 3.3.3.1. 3.8 net torque torque transmitted on a test bed at the end of the crankshaft or its equivalent, at the corresponding engine speed, with the equipment and auxiliaries listed in ISO 15550:2002, Table 1, column 2, and required in column 3 (fitted for engine net power test)
5  Tests
5.1  Test method The test method shall be test method 2 as specified in ISO 15550:2002, 6.3. 5.2  Test conditions The test conditions shall be in accordance with ISO 15550:2002, 6.3.4, together with the following: a) Equipment and auxiliaries shall be installed in accordance with ISO 15550:2002, Table 1, column 3, including Table 1 footnotes. The fan shall include the entire fan system including the fan and all drive components such as the pump, lines and motor for a hydraulic fan. When the fan system is not fitted for the test then the power absorbed at 25 °C (ambient) shall be determined and subtracted from the measured engine power. b) Other machine accessories connected to the engine but that are only necessary for the operation of the machine should be removed for the test. Where accessories cannot be removed, the power absorbed by them in the unloaded condition shall be determined and added to the measured engine power. The following list of examples is non-exhaustive: 1) machine control system(s) hydraulic system pumps; air compressor for machine systems; 3) air-conditioning system compressor; 4) transmission system pump(s); 5) mounted gearbox(es).