report of the grb informal working group on asep transmitted by the chairman of the informal group...
DESCRIPTION
Reminder: why ASEP Customer demand for more sound/noise Manufacturers have a commercial drive for making more sound (quote BMW) Annex 3 covers the part of the engine map with lower revs Decision in GRB to have Additional Sound Emission Provisions (ASEP) to cover a wider part of the engine map (higher revs).TRANSCRIPT
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Report of the GRB informal Working Group
on ASEP
Transmitted by the Chairman of the Informal Group
Informal document No. GRB-44-2(44th GRB, 4-6 September 2006agenda item 1.2.1.3.)
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Summary
• We have a measurement method.• We know enough to decide how to post-
process the data.• We know enough to set limits.• So the group is able to finish their job in
short term.• That’s my intention.
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Reminder: why ASEP
• Customer demand for more sound/noise• Manufacturers have a commercial drive for
making more sound (quote BMW)• Annex 3 covers the part of the engine map
with lower revs
• Decision in GRB to have Additional Sound Emission Provisions (ASEP) to cover a wider part of the engine map (higher revs).
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The Manufacturers drive for sound
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ASEP group
Members: Commission EU, France, Germany,
Italy, Japan, Netherlands, Spain, Sweden, UK, USA
CLEPA, ETRTO, ISO, OICA
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Meetings: 1. 2005 November; Amsterdam
2. 2006 January; The Hague
3. 2006 February; Geneva
2006 Feb-August:Task Force: 4 meetings:(Geneva, Tokyo, Trondheim, Detroit)
4. 2006 September; Geneva (next Thursday)
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1st meeting (Amsterdam)• Get started: it’s new so we were sniffing around
the whole issue in order to make a solid frame work.
Some issues:• no testing needed/wanted for every vehicle• industry wants trade off between existing and
new method:• are vehicles allowed to make more (power train)
noise when using the new method (trade off).
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Very helpful: Terms of Reference
3. The informal group shall develop a complementary test method and evaluation criteria for insertion into Annex 10. The complementary test method shall cover the noise emission under higher engine speeds and loads than the proposed procedure in TRANS/WP.29/GRB/2005/5, as amended.
(no ‘if’, just: fix it)
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A’dam: decisions 1
application: all vehicles should be evaluated, but not every vehicle must be tested
criteria: fitness for purpose, related to doubts, repeatable and reproducible, globally applicable, performance based, technology neutral, easy/cheap, same equipment.
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A’dam: decisions 2
• Vehicles should be tested in highest performance mode
• Acceptable noise behavior: if it’s in line with the new regulation (main body and annex 3 + 10)
• Limit: preference for a boarder line as a function of engine speed
• Limit: related to result annex 3
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And:
• Open pipe devices: will not be allowed– Decision to deal with this in main body text– Discussion how to write it down, no
conclusion on that yet(Open Pipe Device = Steered flaps to bypass the muffler)
Straight pipe
SilencerFlap
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A’dam results
• Long list of 4 available methods– France– Germany– Netherlands– R51.02
• Criteria for the choice
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2nd meeting (The Hague)
• Clarification of the proposals: France
(new), Germany and Netherlands
• First round of scoring
• Discussion about the strong and weak points of the methods
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Results of 2nd meeting (The Hague)
• Preference of the group: Cover an area of the engine map in stead of a single point
• Decision 1: combination of the strong points of each proposal
• Decision 2: little group has to do the technical work– ISO/GM was willing to do the job
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3rd meeting: Geneva, Feb. 2006
Starting points for the technical group (TF).
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Result Technical Group
• 4 meetings
• They finished the job with delivering the method:
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ASEP test method• Lmax• run on same track, same equipment as annex 3• WOT only• higher engine speeds and higher acceleration
than in annex 3 • Multiple test conditions within area of boundary
conditions possible– exit speed: [20-70 km/h]– acceleration [< 3 m/s2]– engine speed [< 60-90% of s, dependent on pmr]
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Area for annex 10 control zoneexample: Car; petrol; PMR = 64 kW/t; S=6000 1/min
0
1000
2000
3000
4000
5000
6000
7000
0 10 20 30 40 50 60 70 80 90 100
velocity (km/h)
engi
ne s
peed
(1/m
in)
1st gear2ns gear3rd gear4th gear5th gearAnnex 10R51_02Annex 3
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Technical Group ready
Thank you Dough, and the members
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Method: next steps (1)
• to make: decision (advice) about boundary conditions
– for acceleration – for exit speed – for engine speed
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Boundaries
They seem to be technical aspects, but they are also the key question:
‘How much freedom do you want to giveto industry’(part of engine map not covered)
And that question is political
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Method: next steps (2)
• To make: decision how to post-process the measurement values:
• issue: how to deal with tyre noise (proposal France)
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Method: next steps (3)Limit value(s)
will be a line through a fixed point:
Limit = A + B*n (n=engine speed)
to decide:– fixed point A: result WOT annex 3 + X
(X=0 – 2 dB(A)?)
– slope line B (around 5 dB(A)/1000 rpm)
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Method: next steps (4)
• With the existing knowledge we are able to do the job.
• More measurements welcome
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ASEP group: other aspects to deal with
The procedure for fulfilling the demands:(homologation)
The wording of the ban of ‘open pipe devices’.
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Procedure of Homologation
• Several options between full testing of every vehicle by TAA and statement by the manufacturer.
• Of course: the requirements apply for every vehicle
• We will discus the pro’s and contra’s of the options and reach a conclusion
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Other aspects
ISO: cooperation
Relation with Reg 59 (repl. silencers) Next meeting
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Summary (repeated)
• We have a measurement method.• We know enough to decide how to post-
process the data.• We know enough to set limits.• So the group is able to finish their job in
short term.
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Proposal to GRBfrom the IG Chairman
Finish the work in 1 year in 2 or 6 steps.1. Preliminary result in November 2006; ASEP
group is going to “sleep”2. Decision GRB in February 20073. Time for everybody to try it out.4. June 2007 proposals for improvement5. If any: ASEP group will wake up and
consider them6. Final proposal to GRB at September
meeting 2007.
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thank you for your attention