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UN/ECE GRB R41WG

UN/ECE GRB R41WG. DEG conclusions 8 August 2007. General - 1. In February 2007, GRB agreed: That ISO362-2 is practical and repeatable To increase the number of MCs in the database to 60 ( from an original sample size of 33)

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UN/ECE GRB R41WG

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  1. UN/ECE GRBR41WG DEG conclusions 8 August 2007

  2. General - 1 • In February 2007, GRB agreed: • That ISO362-2 is practical and repeatable • To increase the number of MCs in the database to 60 ( from an original sample size of 33) • That the database is diverse and broad enough and that R41WG/DEG should prepare the data for a limits discussion (standstill limits and reduction effects; cost-efficiency modelling ideas; consequences for resources (equipment, time)) • That R41WG/DEG should collect more ASEP data (to define ASEP limit line and the PMR exclusion cut-off value)

  3. General - 2 • From April to July 2007, ASEP tests were conducted by Japan & IMMA • Meeting on 2 July 2007 to check data collection process • 4/DEG meeting on 7/8 August to analyse data and prepare material for R41WG and GRB in September 2007

  4. R41 – ISO correlation

  5. Sports Japan BASt SUPERSPORTS 674cc 1352cc India IMMA 998cc 599cc 1170cc 998cc Class I :Up to 25kW/t Class II :25-50kW/t Class III :Above 50kW/t SPORTS & TOURERS 656cc 798cc 1157cc 3X399cc 498cc 656cc 1284cc 680cc 249cc 1157cc 897cc ON/OFF ROAD 2X599cc 656cc 1157cc Small engine capacity Big engine capacity 996cc 249cc 660cc 650cc Class II CRUISERS 1552cc 125cc 399 cc 125cc 499cc 2298cc Class I 244cc 149cc 106cc 2 x 125cc 400cc 1130cc 499cc 249cc 110cc 1584cc 2X49cc 3X 125cc UTILITY & SCOOTERS 3X100cc 223cc 165cc 88cc Utility / Comfort 3X49cc 99cc 95cc

  6. ECE R41-03 vs ISO 362-2

  7. Standstill limit values • Standstill limit values are those which give the same degree of severity as the R41 limit values taking into account the change in the test procedure • These values were calculated from the Lurban noise levels that correspond to the highest valid R41 noise test result (keeping any difference between the R41 result and its limit value)

  8. ECE R41-03 vs ISO 362-2 current limit value Standstill limit

  9. ECE R41-03 vs ISO 362-2 1 outlier (R41 test in 3rd gear; ISO test in 2nd gear) Standstill limit

  10. ECE R41-03 vs ISO 362-2 Out of COP tolerance Tuned gearing (4 outliers (3 at 80 dB(A); 1 at 79 dB(A)) Cycle detection Out of COP tolerance Deletions = 2(COP) + 1 (cycle detection) + 4 (gearing) (filter: LISO,WOT – LECE>2 dB(A)) Standstill limit

  11. Standstill limit values

  12. Cost-effectiveness analysis • Qualitative benefits exist (more robust test procedure for OE and RESS, excluding number of existing models at standstill limits) • Most existing ambient noise prediction models do not cover MCs; the limited number of models that do cover MCs show that Leq contribution from MCs is small except for cities with high MC population • Reliable quantitative cost-effectiveness analysis of reduction scenarios beyond standstill limits not possible although costs could be assessed

  13. Consequences for resources • Potentially more lengthy/costly but offset by: • Duration of noise tests small compared to overall noise test session (eg. travel to and from test site; test site set-up; establishing entry speed; ...) • Increasing experience for testers and preparatory deskwork • Reducing # test runs from 4 to 3 • Higher equipment specifications needed but already commonplace

  14. ASEPcampaign results

  15. General • Tests to the latest ASEP test protocol were done by Japan and IMMA • 25 MCs were used (61 to 385 kW/t) • ASEP data was analysed by linear regression to establish the noise increase/decrease slopes

  16. ASEP limit line 2 dB/1000 rpm Lmax(n) = Lwot i + 5*(n – ni)/1000 + 2 dB (n>ni) Lmax(n) = Lwot,i – 0.95*(ni - n)/1000 + 2 dB (n < ni)

  17. Exclusion of MCs with PMR below 130 kW/t

  18. Exclusion of CVT MCs

  19. Enforcement testing

  20. Enforcement options • At international level: • Type Approval & Conformity of Production • At national level: • Stationary test with reference value • Drive-by acceleration test with reference value (DEG awaits BASt research conclusions)

  21. Summary

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