[Code of Federal Regulations]

[Title 40, Volume 31]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR1048.240]



[Page 567-568]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 1048_CONTROL OF EMISSIONS FROM NEW, LARGE NONROAD SPARK-IGNITION 

ENGINES--Table of Contents

 

                  Subpart C_Certifying Engine Families

 

Sec.  1048.240  How do I demonstrate that my engine family complies with 

exhaust emission standards?



    (a) For purposes of certification, your engine family is considered 

in compliance with the applicable numerical emission standards in Sec.  

1048.101(a) and



[[Page 568]]



(b) if all emission-data engines representing that family have test 

results showing deteriorated emission levels at or below these 

standards.

    (b) Your engine family is deemed not to comply if any emission-data 

engine representing that family has test results showing a deteriorated 

emission level above an applicable emission standard from Sec.  1048.101 

for any pollutant.

    (c) To compare emission levels from the emission-data engine with 

the applicable emission standards, apply deterioration factors to the 

measured emission levels for each pollutant. Specify the deterioration 

factors based on emission measurements using four significant figures, 

consistent with good engineering judgment. For example, your 

deterioration factors must take into account any available data from in-

use testing with similar engines (see subpart E of this part). Small-

volume engine manufacturers may use assigned deterioration factors that 

we establish. Apply deterioration factors as follows:

    (1) Multiplicative deterioration factor. For engines that use 

aftertreatment technology, such as catalytic converters, use a 

multiplicative deterioration factor for exhaust emissions. A 

multiplicative deterioration factor is the ratio of exhaust emissions at 

the end of useful life to exhaust emissions at the low-hour test point. 

Adjust the official emission results for each tested engine at the 

selected test point by multiplying the measured emissions by the 

deterioration factor. If the factor is less than one, use one.

    (2) Additive deterioration factor. For engines that do not use 

aftertreatment technology, use an additive deterioration factor for 

exhaust emissions. An additive deterioration factor is the difference 

between exhaust emissions at the end of useful life and exhaust 

emissions at the low-hour test point. Adjust the official emission 

results for each tested engine at the selected test point by adding the 

factor to the measured emissions. If the factor is less than zero, use 

zero.

    (d) Collect emission data using measurements to one more decimal 

place than the applicable standard. Apply the deterioration factor to 

the official emission result, as described in paragraph (c) of this 

section, then round the adjusted figure to the same number of decimal 

places as the emission standard. Compare the rounded emission levels to 

the emission standard for each emission-data engine. In the case of HC + 

NOX standards, apply the deterioration factor to each 

pollutant and then add the results before rounding.



[70 FR 40474, July 13, 2005]