§ 86.1342-94 - Calculations; exhaust emissions.

Link to an amendment published at 79 FR 23704, Apr. 28, 2014.

Section 86.1342-94 includes text that specifies requirements that differ from §86.1342-90. Where a paragraph in §86.1342-90 is identical and applicable to §86.1342-94, this may be indicated by specifying the corresponding paragraph and the statement “[Reserved]. For guidance see §86.1342-90.”

(a) introductory text [Reserved]. For guidance see §86.1342-90.

(a)(1) AWM=Weighted mass emission level (HC, CO, CO2. or NOX) in grams per brake horsepower-hour and, if appropriate, the weighted mass total hydrocarbon equivalent, formaldehyde, or non-methane hydrocarbon emission level in grams per brake horsepower-hour.

(a)(2) through (b)(7) [Reserved]. For guidance see §86.1342-90.

(b)(8) Non-methane hydrocarbon mass:

NMHCmass = Vmix × DensityNMHC × (NMHCconc/1,000,000)

(c) through (d)(1)(i) [Reserved]. For guidance see §86.1342-90.

(d)(1)(ii) DensityHC = Density of hydrocarbons.

(A) For gasoline and the gasoline fraction of methanol-fuel, and may be used for petroleum and the petroleum fraction of methanol diesel fuel if desired; 16.33 g/ft3-carbon atom (0.5768 kg/m3-carbon atom).

(B) For #1 petroleum diesel fuel; 16.42 g/ft3-carbon atom (0.5800 kg/m3-carbon atom).

(C) For #2 diesel 16.27 g/ft3-carbon atom (0.5746 kg/m3-carbon atom). Average carbon to hydrogen ratios of 1:1.85 for gasoline, 1:1.93 for #1 petroleum diesel fuel and 1:1.80 for #2 petroleum diesel fuel are assumed at 68 °F (20 °C) and 760 mm Hg (101.3 kPa) pressure.

(D) For natural gas and liquified petroleum gas-fuel; 1.1771 (12.011+H/C (1.008)) g/ft3-carbon atom (0.04157 (12.011+H/C (1.008)) kg/m3-carbon atom) where H/C is hydrogen to carbon ratio of the hydrocarbon components of the test fuel, at 68 °F (20 °C) and 760 mm Hg (101.3 kPa) pressure.

(d)(1)(iii) through (d)(1)(iv)(A) [Reserved]. For guidance see §86.1342-90.

(d)(1)(iv)(B) For petroleum-fueled, natural gas-fueled and liquified petroleum gas-fueled engines, HCe is the FID measurement.

(d)(1)(iv)(C) through (d)(3)(v)(A) [Reserved]. For guidance see §86.1342-90.

(d)(3)(v)(B) COe = [1 − (0.01 + 0.005HCR) CO2. − 0.000323R] COem for methanol-fuel, natural gas-fuel and liquified petroleum gas-fuel where HCR is hydrogen to carbon ratio as measured for the fuel used.

(d)(3)(vi) through (d)(5)(iii)(B) [Reserved]. For guidance see §86.1342-90.

(d)(5)(iv)(A) CCH3OHe=Methanol concentration in the dilute exhaust, in ppm.

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(v)(A) CCH3OHd=Methanol concentration in the dilution air, in ppm

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(vi) TEM=Temperature of methanol sample withdrawn from dilute exhaust, °R

(vii) TDM=Temperature of methanol sample withdrawn from dilution air, °R

(viii) PB=Barometric pressure during test, mm Hg.

(ix) VEM=Volume of methanol sample withdrawn from dilute exhaust, ft3

(x) VDM=Volume of methanol sample withdrawn from dilution air, ft3

(xi) CS=GC concentration of sample drawn from dilute exhaust

(xii) CD=GC concentration of sample drawn from dilution air

(xiii) AVS=Volume of absorbing reagent (deionized water) in impinger through which methanol sample from dilute exhaust is drawn, ml

(xiv) AVD=Volume of absorbing reagent (deionized water) in impinger through which methanol sample from dilution air is drawn, ml

(xv) 1=first impinger.

(xvi) 2=second impinger.

(d)(6)(i) through (d)(7)(i) [Reserved]. For guidance see §86.1342-90.

(d)(7)(ii) For methanol-fueled vehicles, where fuel composition is CX Hy Oz as measured, or calculated, for the fuel used:

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(d)(8)(i) [Reserved]. For guidance see §86.1342-90.

(d)(8)(ii) For Otto-cycle engines: KH=1/[1-0.0047(H-75)] (or for SI units, KH=1/[1-0.0329(H-10.71)]).

(iii) For diesel engines: KH = 1/[1-0.0026 (H-75)] (or for SI units = 1/[1-0.0182 (H-10.71)]).

(d)(8)(iv) through (d)(9)(x) [Reserved]. For guidance see §86.1342-90.

(d)(10)(i) NMHCconc = HCconc-CH4conc

(ii) DensityNMHC = The density of non-methane hydrocarbon, is 1.1771(12.011 + H/C (1.008)) g/ft3-carbon atom (0.04157(12.011 + H/C (1.008))kg/m3-carbon atom), where H/C is the hydrogen to carbon ratio of the non-methane hydrocarbon components of the test fuel, at 68 °F (20 °C) and 760 mm Hg (101.3 kPa) pressure.

(iii)(A) CH4conc = Methane concentration of the dilute exhaust sample corrected for background, in ppm carbon equivalent.

(B) CH4conc = rCH4 × (CH4e-CH4d(1-1/DF))

(1) CH4e = Methane exhaust bag concentration in ppm carbon equivalent.

(2) CH4d = Methane concentration of the dilution air in ppm carbon equivalent.

(3) rCH4 = HC FID response to methane for natural gas-fueled vehicles as measured in §86.1321 (d).

(e) Through (i) [Reserved]. For guidance see §86.1342-90.

[59 FR 48534, Sept. 21, 1994, as amended at 60 FR 34375, June 30, 1995; 62 FR 47135, Sept. 5, 1997]