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| Document Title | REC: NO2/NOx from retrofitted DPF: ETC - WHTC correlation | ||||||||
| Reference Number | REC-14-12 | ||||||||
| Date |
22 Feb 2013
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| Summary | Presentation comparing performance results of retrofit diesel particulate filters under the European Test Cycle and Worldwide Harmonized Test Cycle. | ||||||||
| Source(s) | TNO | ||||||||
| Rulemaking Area(s) | UN R132 Retrofit Emissions | ||||||||
| Meeting(s) | |||||||||
| Downloads | |||||||||
| UNECE server | .pdf format | ||||||||
| Excerpts from session reports related to this document | |||||||||
| REC | Session 14 | 19-20 Feb 2013 |
Baarbé said the key remaining open issue is the NO2 increase caused by PM REC and in that context he presented new data from TNO on NO2/NOx from PM RECs resulting in average ratios for different conditions (doc. REC-14-12). Results are 30% NO2 in ETC matches, 21,5% in WHTC matches and 15,4% in WHTC urban. These percentages include an 8 % NO2 share engine out, as was later during the meeting confirmed by TNO. Himmen noted that all depends on the kinetics and asked where Prof Czerwinski got the base data used in the study. He stressed this information on kinetics has to be known to understand the outcome of the study. Galey showed the data in the EIC paper on NO2 increase for CRT and FBC systems over WHTC and NRTC (resp. approx. 25% and 35%). FBC systems show an increasing back-pressure due to soot loading and risks on DPF regeneration. Baarbé asked for the German position? Schulte confirmed the German position on max. 20% NO2 increase. Baarbé asked about NO2 increase for NRMM machines as e.g. Berlin is investigating a LEZ for NRMM. Himmen noted that REC foresees a class with zero NO2 increase. Baarbé noted this was discussed several times and the German position is well known. He noted that this strong German position might delay the work of the REC group and in the meantime there isn’t any NO2-increase criterion in any existing legislation in Europe concerning retrofit. He asked the German delegation to consider this carefully. Himmen asked why NO2 is not well considered for e.g. Euro VI. Schulte said the overall NOx is that low for Euro VI so that NO2 is not a major issue. Baarbé concluded that there is no agreement on NO2 increase possible at this stage but perhaps an agreement might be reached during the next GRPE. He will report to the GRPE chair about the divergent positions (industry vs. Germany). Following a comment from Galey on Germany’s position, Baarbé recognised that the Netherlands, Switzerland and France could accept a more moderate NO2 increase based on the assumed cost of the REC systems for the future. Tremayne noted that we might be focussing too much on Europe. What do other world regions want for their REC systems? |
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