[Code of Federal Regulations]
[Title 40, Volume 17]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR86.343-79]

[Page 615]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 86_CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND 
ENGINES--Table of Contents
 
Subpart D_Emission Regulations for New Gasoline-Fueled and Diesel-Fueled 
           Heavy-Duty Engines; Gaseous Exhaust Test Procedures
 
Sec. 86.343-79  Chart reading.

    (a) A computer or any other automatic data processing device(s) may 
be used as long as the system meets the requirements of this subpart.
    (b) Determine the location on the chart of the analyzer responses 
corresponding to the end of each mode.
    (c) For gasoline-fueled engines, determine whether the test cycle 
was run in accordance with Sec. 86.335 by observing either chart event 
marks, speed trace, torque trace, or concentration traces. The test will 
be invalidated if there is a deviation of more than:
    (1) 2 seconds from the specified time for each CT mode, and 4 
seconds for all other modes; or,
    (2) Two percent of maximum torque during the exhaust gas sampling 
period (last 10 seconds on each nonclosed throttle gasoline-fueled 
engine mode); or
    (3) 5 percent of maximum torque during the remainder of the mode, 
excluding the first 35 seconds of the mode; or
    (4) 200 rpm during the first 10 seconds of each mode, or 100 rpm 
during the remainder of each mode.
    (d) Determine chart deflections.
    (1) Locate the last 10 seconds of each gasoline-fueled engine mode 
except CT. Locate the last 50 seconds of each gasoline-fueled engine CT 
mode. For all Diesel engine modes locate the last 60 seconds.
    (2)(i) Divide the last 10 seconds or 60 seconds, whichever is 
applicable, into a minimum of 10 equally spaced increments. Determine 
the chart deflection of each increment for the CO2, CO, HC, 
and NOX analyzers.
    (ii) Option for Diesel engine modes. If the deviation from a 
straight line (other than instrument noise) during this 60 seconds is 
less than 5 percent of full-scale, the average 
chart deflection may be determined by eye. The average value (one 
number) may then be used in lieu of the 10 values required by paragraph 
(d)(2)(i) of this section.
    (3) Other methods of determining the chart deflection of the 
analyzers may be used only with prior approval by the Administrator.
    (e) Determine CO2, CO, HC, and NOX 
concentrations for each mode.
    (1) If the option in paragraph (d)(2)(ii) of this section is 
employed, then those chart deflections for both linear and non-linear 
analyzers may be substituted for the average chart deflection in step 
(e)(2).
    (2) For linear instruments, average the chart deflections determined 
in paragraph (d)(2)(i) of this section. Determine the concentration for 
this average chart deflection using calibration data.
    (3) For non-linear instruments, calculate concentrations for each 
chart deflection determined in paragraph (d)(2)(i) of this section. Take 
the average of these concentrations for each mode.
    (4) For purposes of this paragraph, calibration data includes 
calibration curves, linearity curves, span-gas responses, and zero-gas 
responses.

[42 FR 45154, Sept. 8, 1977, as amended at 47 FR 49813, Nov. 2, 1982]

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