Example Test Sequence for Highway Engines Sample Clauses

Example Test Sequence for Highway Engines. Table 3 outlines the minimum highway diesel engine SCR verification test for a single engine. The technology being evaluated in Table 3 is assumed to be one whose expected emissions reduction is large enough that the minimum data set (one FTP cold start cycle, three FTP hot start cycles, and one SET) at each test point provides a sufficiently narrow confidence interval. Other diesel engine applications may run the appropriate FTP test sequence with additional SET testing as required. 5.2.6 Data Reduction for SCR 1. Select representative engine and stabilize in baseline condition. 2. Map engine in baseline condition and practice cycles. 3. Conduct one FTP cold start cycle, three FTP hot start cycles, and one SET on base engine. 4. Install degreened SCR system, and operate and stabilize engine. 5. Practice cycles using baseline condition map. 6. Conduct one FTP cold start cycle, three FTP hot start cycles, and one SET on SCR-equipped engine. (Optional: To avoid repeating the base test, repeat steps 4–6 with aged SCR immediately following degreened SCR test.) 7. Compare baseline and SCR-equipped engine emissions results for emissions reductions. For highway diesel engines, emissions test results are recorded at each test point for HC, CO, NOx, PM, and the other measured pollutants. For each pollutant, the single cold start emission measurement (EC) is combined with each of up to three hot start tests (eH) to obtain up to three composite emissions rates following the normal fractional calculation for highway engines: (1/ 7)(ec ) + (6 / 7)(eH )m (Ecomp )m = (1/ 7)(W ) + (6 / 7)(W )