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ASEP Progress Report: Achievements and Future Directions

This report outlines the progress made by the Additional Sound Emissions Provisions (ASEP) working group, focusing on key decisions, discussions, and future goals related to sound emissions in vehicle engines. Essential elements and meetings are highlighted, along with tasks and fine-tuning methods. The ASEP's main issue, relation with COP, and upcoming discussions are addressed for further clarity and direction.

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ASEP Progress Report: Achievements and Future Directions

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  1. Report GRB ad hoc Working Group ASEPissued by the Chairman of the ASEP WGGRB 48; September 20082008-09-02 ASEP report to GRB 48 Transmitted by the GRB informal group on Additional Sound Emissions Provisions (ASEP) Informal document No. GRB-48-3 (48th GRB, 1-3 September 2008, agenda item 3(c))

  2. Abstract • Acceptance for ASEP • The main approach is finished • Essential elements: in discussion • Formal Wording: waiting for decisions

  3. Reminder: why ASEP • Annex 3 covers the part of the engine map with lower revs • Decision made to have Additional Sound Emission Provisions to cover a wider part of the engine map (higher revs).

  4. Products to deliver: Product to deliver: A proposal to GRB for the text (test method, data processing to test result, limits and control range) of annex 10, and - if needed - proposals for necessary changes in the main body.

  5. Meetings:  • Amsterdam 2005 November • The Hague 2006 January • Geneva 2006 February • Geneva 2006 September • The Hague 2006 November • Geneva 2007 February • The Hague 2007 May • The Hague 2007 autumn • Ann Arbor USA 2008 January • Geneva 2008 February • Tokyo 2008 June

  6. What did we accomplished: • Acceptance of ASEP • The measurement method (mr Moore) • Focus only on the ‘normal’ vehicles. • A choice for a design based system • We have a system (anchor point, slope, margin) • Decision to exclude tyre noise (no calculation) • Intention for text main body • The beginning of a legal wording • Decision: COP applies       

  7. What do we have to do: Text Main body Fine tuning method Wording annex 10 Decision yes/no ‘Always Testing’ Wording Certificate Fit with regulation for ‘Replacement Silencers’

  8. Fine tuning method (1) GER/FRA and OICA methods become close Differences: Fixed (FRA/GER) vs relative limit line Measurement procedure: free vs protocol

  9. Fine tuning method (2) Work to do: decisions essential elements • limit line: fixed or relative • slope limit line (4-5-6-7 dB(A)/1000revs) • anchor point • boundary conditions

  10. Fine tuning method (3) Main issue: anchor point of the limit slope lower in revs  more liberal ASEP limit higher in revs  tougher limit Difference: up to 6 dB Relation with COP By The Way:

  11. Fine tuning method (4) Boundary condition ‘maximum acceleration’ In discussion: 2 m/s2 sufficient for high powered vehicles?

  12. Process Important decisions take time Next meeting: • some members have no position yet • So open discussion about the essentials of both methods

  13. Thank You

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