Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:110:p17
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 110 (pt 17/59)
Character Range: 650625–653420

regression analysis shall be made on the basis of all test results. The results of each test for each pollutant shall be expressed to the same number of decimal places as the limit value for that pollutant, as shown in the Tables in section 6.2.1 of Annex I to Directive 2005/55/EC, plus one additional deci- mal place. In accordance with section 3.2, if it has been agreed that only one test cycle (ESC or ETC) be run at each test point and the other test cycle (ESC or ETC) run only at the beginning and end of the service accumulation schedule, the regression analysis shall be made only on the basis of the test results from the test cycle run at each test point.

             3.5.2. On the basis of the regression analysis, the manufacturer shall calculate the projected emission values for each pollutant at the start of the service accumulation schedule and at the useful life that is applicable for the engine under test by extrapolation of the regression equation as determined in section 3.5.1.

             3.5.3. For engines not equipped with an exhaust aftertreatment system, the deterioration factor for each pollutant is the difference between the pro- jected emission values at the useful life period and at the start of the service accumulation schedule.

              For engines equipped with an exhaust aftertreatment system, the deterioration factor for each pollutant is the ratio of the projected emission val- ues at the useful life period and at the start of the service accumulation schedule.

              In accordance with section 3.2, if it has been agreed that only one test cycle (ESC or ETC) be run at each test point and the other test cycle (ESC or ETC) run only at the beginning and end of the service accumulation schedule, the deterioration factor calculated for the test cycle that has been run at each test point shall be applicable also for the other test cycle, provided that for both test cycles, the relationship between the measured values run at the beginning and at the end of the service accumulation schedule are similar.

             3.5.4. The deterioration factors for each pollutant on the appropriate test cycles shall be recorded in section 1.5 of Appendix 1 to Annex VI to Directive 2005/55/EC.

             3.6. As an alternative to using a service accumulation schedule to determine deterioration factors, engine manufacturers may choose to use the following deterioration factors:

Engine type        Test cycle  CO    HC    NMHC  CH4   NOx   PM
Diesel engine (1)  ESC         1,1   1,05  —     —     1,05  1,1
ETC                1,1         1,05  —     —     1,05  1,1
Gas engine (1)     ETC         1,1   1,05  1,05  1,2   1,05  —

              (1) Where appropriate and on the basis of information to be supplied by the Member