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Effective NO2 Measurement Method as Proposed by Japan - Dec 2010

This study compares NO2 measurement methods for compliance with Euro 5 or 6 standards. Test results show no significant difference between CVS-Bag method and proposed Modal method. Japan recommends further evaluation of measurement methods for precision and applicability.

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Effective NO2 Measurement Method as Proposed by Japan - Dec 2010

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  1. NO2 Measurement Method proposed by Japan 9 ~ 10 December 2010

  2. Current concerns on NO2 measurement Concentration for emission system comply with Euro5 or 6 Refer WLTP-DTP-02-06

  3. Proposed method based on WLTP-DTP-02-06 <Modal Method> NO2(ppm)= CVS-Bag_NOx(ppm) – diluted exhaust NO average(ppm)

  4. Counter Proposal by Japan Apply current measurement method (=CVS-Bag method) then, analyze NOx/NO respectively NOx/NO <CVS-Bag Method> No modal measurement of NO from diluted exhaust is necessary

  5. NO2 reaction ratio NO2 reaction ratio is less than 2% when NO concentration in Bag is less than 4 ppm (=equivalent Euro 5 or 6 level) 3 Test results (measured by CLD) ● 2.5 *: average concentration @ CVS 12m3/min 2 Theoretical line of NO->NO2 reaction ratio D-Euro6* NO -> NO2 reaction ratio in Bag after 15 min. (%) G-Euro5,6* 1.5 1 D-Euro5* 0.5 0 6 0 1 2 3 4 5 Bag-NO Concentration (ppm)

  6. Test Results Comparison (NO, NO2) No significant difference is observed between CVS-Bag method and Modal method Petrol vehicle (NEDC Total : NOx 0.049g/km) 3 NO2 2 Concentration (ppm) 1 NO NO2=0.00 NO2=0.02 0 CVS-Bag Modal CVS-Bag Modal NEDC_Part2 NEDC_Part1 Diesel vehicle (NEDC Total : NOx 0.174g/km) 6 NO2 5 4 Concentration (ppm) 3 NO NO2=0.04 NO2=0.07 2 1 0 CVS-Bag Modal CVS-Bag Modal NEDC_Part2 NEDC_Part1

  7. Test-to-Test Variability (NO) Nearly identical for both average and variability level Petrol vehicle (NEDC Total : NOx 0.049g/km) 1 5 NEDC_Part1 (n=9) NEDC_Part2 (n=9) 0.8 4 ･2σ/:30.1% ･Ave.:2.75 ･2σ/:27.2% ･Ave.:2.62 ･2σ/:20.4% ･Ave.:0.52 ･2σ/:17.5% ･Ave.:0.50 0.6 3 NO concentration (ppm) NO concentration (ppm) 0.4 2 0.2 1 0 0 CVS-Bag Modal CVS-Bag Modal

  8. Summary • Recent study in Japan indicates no significant difference between CVS-bag method and proposed method for NO2 measurement. • It’s not right timing to eliminate the currently well recognized method without knowing the applicability under the new test cycle and new test procedure. • Once new cycle and new test procedure are available, Japan will evaluate the measurement methods again from the view points of measurement precision, applicability, investment and so on, then report it to this group for final decision.

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