![]() (i) Correct all gaseous emission analyzer concentration readings, including continuous readings, sample bag readings, and dilution air background readings, for drift as described in § 1065.672. Perform the following sequence of preliminary calculations on recorded concentrations: Calculate the total mass of emissions as follows: Finally, if necessary, calculate the mass of NMHC as described in paragraph (c)(5) of this section for all systems. Next, use the method in paragraphs (c)(2) through (4) of this section that is appropriate for your system. For all systems, make preliminary calculations as described in paragraph (c)(1) of this section to correct concentrations. To calculate the total mass of an emission, multiply a concentration by its respective flow. (c) Total mass of emissions over a test interval. The result is a brake-specific emission value calculated as follows: Under this method, flow meters need not meet accuracy specifications, but they must meet the applicable linearity and repeatability specifications in subpart D or subpart J of this part. You then use the same linearly proportional signal to determine total work using a chemical balance of fuel, intake air, and exhaust as described in § 1065.655, plus information about your engine's brake-specific fuel consumption. This is a special case in which you use a signal linearly proportional to raw exhaust molar flow rate to determine a value proportional to total emissions. Good engineering judgment dictates that this method not be used if there are any work flow paths described in § 1065.210 that cross the system boundary, other than the primary output shaft (crankshaft). You may also use this approach for laboratory testing, consistent with good engineering judgment. (3) For field testing, you may calculate the ratio of total mass to total work, where these individual values are determined as described in paragraph (f) of this section. (2) For discrete-mode steady-state testing, you may calculate the brake-specific emissions over a test interval using the ratio of emission mass rate to power, as described in paragraph (e) of this section, using the following equation: The result is a brake-specific emission value calculated as follows: (1) For any testing, you may calculate the total mass of emissions, as described in paragraph (c) of this section, and divide it by the total work generated over the test interval, as described in paragraph (d) of this section, using the following equation: ![]() We specify three alternative ways to calculate brake-specific emissions over a test interval, as follows: (1) For any testing, you may calculate the total mass of emissions, as described in paragraph (c) of this section, and divide it by the total work generated over the test interval, as described in paragraph (d) of this section, using the following equation: (2) For discrete-mode steady-state testing, you may calculate the brake-specific emissions over a test interval using the ratio of emission mass rate to power, as described in paragraph (e) of this section, using the following equation: (3) For field testing, you may calculate the ratio of total mass to total work, where these individual values are determined as described in paragraph (f) of this section. Brake-specific emissions over a test interval.īrake-specific emissions over a test interval. ![]()
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