5.1.4 This chapter includes the test and measurement methods, test run and test report as a procedure for a test measurement.
5.1.5 In principle, during emission tests, air engine shall be equipped with its auxiliaries in the same manner as it would be used on board.
5.1.6 For many engine types within the scope of this Code, the auxiliaries which may be fitted to the engine in serve may not be known at the time of manufacture or certification. It is for this reason that the emissions are expressed on the basis of brake power as defined in 1.3.14.
5.1.7 When it is not appropriate to test the engine under the conditions as a defined in 5.2.3, e.g., if the engine and transmission from a single integral unit, the engine may only tested with other auxiliaries fitted. In this case the dynamometer settings shall be determined in accordance with 5.2.3 and 5.9. The auxiliary losses shall not exceed 5% of the maximum observed power. Losses exceeding 5% shall be approved by the Administration involved prior to the test.
5.1.8 All volumes and volumetric flow rates shall be related to 273K (0 ﾟC) and 101.3 kPa.
5.1.9 Except as otherwise specified, all results of measurements, test data or calculations required by this chapter shall be recorded in the engines test report in accordance with 5.10.
5.1.10 Tables 1, 2, 3 and 4 of appendix 3 of this Code summarize the abbreviations, subscripts and symbols used throughout this Code, including specifications for the analytical instruments in appendix 5. calibration requirements for the analytical instruments contained in appendix 6 and the formulae for calculation of gas mass flow as contained in chapter 5 and appendix 7 of this Code.
5.2 TEST CONDITIONS
5.2.1 Test condition parameter and rest validity for engine family approval
Parameter f a shall be determined according to the following provisions:
(1)
(2)
and, for a test so be recognized as valid, parameter f a shall be such that:
MEPC 39/6/1
ANNEX
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0.98≦f a≦1.02 (3)
5.2.2 Engines with charge air ensuing
The temperature of the cooling medium and the temperature of the charge air shall be recorded. The cooling system shall be set with the engine operating at the reference speed and load. The charge air temperature and cooler pressure drop shall be set to within ± 4 K and ± 2 kPa. respectively, of the manufacturer's specification.
5.2.3 Power
5.2.3.1 The basis for the measurement of specific emissions is uncorrected brake power.
5.2.3.2 Auxiliaries not necessary for the operation of the engine and which may be mounted on the engine may be removed for the test. See also 5.1.5 and 5.1.6.
5.2.3.3 Where non-essential auxiliaries have not been removed, the power absorbed by them as the test speeds shall be determined in order to calculate the uncorrected brake power in accordance with formula (18).
5.1.4 Engine air inlet system
The test engine shall be equipped with an air titles system which provides an air inlet restriction, specified by the manufacturer, to represent an unfouled air cleaner at the engine operating conditions, as specified by the manufacturer, and which results in maximum air flow in the respective engine application.
5.2.5 Engine exhaust system
The test engine shall be equipped with an exhaust system which provides an exhaust back pressure as specified by the manufacturer at the engine operating conditions and which results in the maximum declared power in the respective engine application.
5.2.6 Cooling system
An engine cooling system with sufficient capacity to maintain the engine at normal operating temperature as specified by the manufacturer shall be used.
5.2.7 Lubricating oil
Specifications of the lubricating oil used for the test shall be recorded.
5.3 TEST FUELS
5.3.1 Fuel characteristics may influence the engine exhaust gas emission. Therefore, the characteristics of the fuel used for the test shall be determined and recorded. Where reference fuels are used. the reference code or specifications and the analysis of the fuel shall be provided.
