Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:20:p22
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 20 (pt 22/29)
Character Range: 279257–281982

this annex on the test bench, the power absorbed by them shall be determined and subtracted from the measured engine power (reference and actual) over the whole engine speed range of the WHTC and over the test speeds of the WHSC.
6.3.3. Auxiliaries/equipment to be removed for the test
 Where the auxiliaries/equipment not required according to Appendix 6 to this annex cannot be removed, the power absorbed by them may be determined and added to the measured engine power (reference and actual) over the whole engine speed range of the WHTC and over the test speeds of the WHSC. If this value is greater than 3 per cent of the maximum power at the test speed it shall be demonstrated to the Type Approval Authority.
6.3.4. Determination of auxiliary power
 The power absorbed by the auxiliaries/equipment needs only be determined, if:
(a) Auxiliaries/equipment required according to Appendix 6 to this annex, are not fitted to the engine;
 and/or
(b) Auxiliaries/equipment not required according to Appendix 6 to this annex, are fitted to the engine.
 The values of auxiliary power and the measurement/calculation method for determining auxiliary power shall be submitted by the engine manufacturer for the whole operating area of the test cycles, and approved by the Type Approval Authority.
6.3.5. Engine cycle work
The calculation of reference and actual cycle work (see paragraphs 7.4.8. and 7.8.6.) shall be based upon engine power according to paragraph 6.3.1.  In this case, Pf and Pr of equation 4 are zero, and P equals Pm.
If auxiliaries/equipment are installed according to paragraphs 6.3.2. and/or 6.3.3., the power absorbed by them shall be used to correct each instantaneous cycle power value Pm,i, as follows:
  (4)
Where:
Pm,i is the measured engine power, kW
Pf,i is the power absorbed by auxiliaries/equipment to be fitted, kW
Pr,i is the power absorbed by auxiliaries/equipment to be removed, kW.
6.4. Engine air intake system
 An engine air intake system or a test laboratory system shall be used presenting an air intake restriction within 300 Pa of the maximum value specified by the manufacturer for a clean air cleaner at the rated speed and full load. The static differential pressure of the restriction shall be measured at the location specified by the manufacturer.
6.5. Engine exhaust system
 An engine exhaust system or a test laboratory system shall be used presenting an exhaust backpressure within 80 to 100 per cent of the maximum value specified by the manufacturer at the rated speed and full load. If the maximum restriction is 5 kPa or less, the set point shall be no less than 1.0 kPa from the maximum. The exhaust system shall conform to the requirements for exhaust gas sampling, as