AS ISO 9249:2021 pdf free download - Earth-moving machinery - Engine test code -Net power

AS ISO 9249:2021 pdf free download – Earth-moving machinery – Engine test code -Net power

Posted by

AS ISO 9249:2021 pdf free download – Earth-moving machinery – Engine test code -Net power.
AS ISO 9249 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 lilting 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 I436 by test or calculation methods. See Aniiez.A for the preferred calculation method for obtainIng the net power ratings accordIng Ia this International Standard, lhih the test and the calculation method comply with this International Standard,
2 Normative references
The following referenced documents arc indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6165. Earth-moving machinery — Basic types — Identification and 1erms and definitions
ISO 14396. Reciprocating internal combustion enqines — Determination and method for the measurement of engine power — Additional requirements far exhaust emission tests in accordance with Iso 8178
ISO 15550:2002, Internal combustion engines — Determination and method for the measurement of engine power — General requirements
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the symbols and abbreviated terms given In ISO 15550 and the illowing terms and definitions apply.
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”
LSO1iRC: ISO 15550:2002, definition 3.24J
declared power
value of the power, declared by the manufacturer, which an engine will deliver under a given set of circumstances
Note ito entry: In some applications, the declared power is named ratcd powcr.
[SOURCE: ISO 15550:2002, definition 3.3.1]
Al General
Like this International Standard, ISO 14396 is a *satellite to ISo 15550. It is used to specify the method
and additional requirements for determining the power of reciprocating internal combustion (RIC)
engines when presented for an exhaust emission test in accordance with ISO 8178.
The testing requirements of this International Standard are very similar to those of ISO 14396. as both are basest on the core” standard. ISO 15550. The fundamental difference between them is that the power declared using this International Standard deducts relevant equipment and accessories from the power values of ISO 14396.
A.2 Calculation
For the calculation of net power according to this International Standard, deduct the power absorbed by
— the cooling equipment fan (if equipped).
— the pressure-charging equipment coolant pump or fan (if equipped). and
— equipment and auxiliaries Ilted in Table2.
from the corrected engine power measured in accordance with ISO 14396.
The power of the fan(s) and pump shall be determined at the speeds corresponding to the engine speeds used for the measurement of engine power either by calculation from standard characteristics or by practical tests, corrected to the standard atmospheric conditions (see ISO 15550:2002, Clause 5).
The accuracy of the net power ratings shall satisfy the requirements of Clause 9.
An example and consequence of the calculation (using the example of a liquid cooling fan) is given in Table AJ and shown in Figure AJ.

Leave a Reply

Your email address will not be published. Required fields are marked *