UNITED

NATIONS

Distr.

Economic and Social	GENERAL

Council	TRANS/WP.29/652

16 February 1999

ENGLISH

Original: ENGLISH and FRENCH

ECONOMIC COMMISSION FOR EUROPE

INLAND TRANSPORT COMMITTEE

Working Party on the Construction of Vehicles

CORRIGENDUM 2 TO SUPPLEMENT 1 TO THE 02 SERIES

OF AMENDMENTS TO REGULATION No. 49

(Emissions of C.I., N.G. and P.I. (LPG) engines)

Note: The text reproduced below was adopted by the Administrative Committee (AC.1) of the amended 1958 Agreement at its tenth session following the recommendation by the Working Party at its one-hundred-and-sixteenth session. It is based on document TRANS/WP.29/1998/29/Rev.1, as corrected by the Working Party (TRANS/WP.29/640, para. 144).

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GE.99-

Annex 4, paragraph 2.2.2., amend to read:

"2.2.2.	Spark ignition engines

"

Annex 4 - Appendix 1,

Paragraph 2.2., amend to read:

".... For determination of exhaust flow either of the following methods may be used. The volumetric flow rates V'EXH and V"EXH are defined at T = 273 K and p = 101.315 kPa."

Annex 4 - Appendix 3,

Paragraph 1.1.2.1.2., amend to read:

"1.1.2.1.2.	In the case of N.G. engine:

ppm (wet basis) = ppm (dry basis) x (1 - 3.15 GFUEL/GAIR)

where:

GFUEL is the fuel flow (kg/s) (kg/h)

GAIR is the air flow (kg/s) (kg/h)."

Paragraph 1.1.3.2., amend to read:

"1.1.3.2.	N.G. and LPG engines NOx correction factor:

The values of the oxides of nitrogen shall be multiplied by the following humidity correction factor (KNOx):

KNOx = 0.6272 + 0.4403 H - 0.0008625 H2

where:

H =	humidity of the inlet air in g of H2O per kg dry air

(see paragraph 1.1.3.1.)"

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