Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal...

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Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No . GRB-49-07 (49th GRB, 16-18 February 2009, agenda item 3(c))

Transcript of Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal...

Page 1: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Report GRB ad hoc Working

Group ASEP

by the Chairman of the ASEP WGGRB 49; February 2009

Informal document No. GRB-49-07(49th GRB, 16-18 February 2009, agenda item 3(c))

Page 2: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

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).

Page 3: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Products to deliver:

A proposal to GRB for the text (test method, data processing to test result, limits and control range) of annex 10,

and proposals for necessary

changes in the main body.

Page 4: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Meetings: 

1. Amsterdam 2005 November2. The Hague 2006 January3. Geneva 2006 February

3a-d Task Force 2006 Feb-Aug 4. Geneva 2006 September5. The Hague 2006 November6. Geneva 2007 February7. The Hague 2007 May8. The Hague 2007 October9. Ann Arbor USA 2008 January10. Geneva 2008 February11. Tokyo 2008 June

12.Geneva 2008 September13.Paris 2008 November

13a.Expert group Paris 2008 December14.Paris 2009 January

Page 5: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Why so long?

Differences with Annex 3:

1. Acceptance

2. New Concept (point range)

3. Limitation discussion

Page 6: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

What did we accomplish:

• System• Legal wording • Understanding main issue      

Page 7: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

System: how it worksstep 1: anchor point

Anchor point in gear i comes from Annex 3 (Lwot,i, nBB,i)

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Page 8: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

System: how it worksstep 2: ASEP measurements

4 additional measurements in gear i within boundaries

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Page 9: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

System: how it worksstep 3: construction of slope

Calculate slope trough measurementsSlope is maximized to X dB/1000 rpm; X determines stringency (to be

agreed on)

y = 0,0053x + 57,739

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Page 10: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

System: how it worksstep 4: add margin

Margin = LimitA3 - Lurban,A3 (bigger for silent vehicles)

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Lurban

Margin

Page 11: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

System: how it worksstep 5: limit line

Limit = anchor point + margin + Y + slope Y determines stringency (to be agreed on)

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Page 12: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

System: how it worksstep 6: compare measurements

to limit

Every measurement from step 2 is checked against limit

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Page 13: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

System: how it worksstep 7: repeat in other gears

• Other gears than gear i are corrected for different tyre noise contribution

• In principle all gears and modes have to fulfill ASEP, however– Gears higher than i+1 may be exempted– Gear 1 likely to be skipped due to engine

speed overrun within test track– In practice mostly only gear 2 and 3

Page 14: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Legal wording

See informal document no 3

Agreement on many issues

Some technical issues to be dealt with (like CVT’s)

Page 15: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Main Issue

It’s all about

STRINGENCY

Page 16: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

ISSUE RAISED: TNO

“the present proposal will result in a very undesirable situation: compared to the R51.02 regulation that is currently in use and also is based on an acceleration test, the OICA proposal will

result in an extra driveline noise allowance for most vehicles, which can reach up to 10 dB with an average of about 3 dB.”

Page 17: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Expert Group

Looked to it in details

Came up with analyses

Page 18: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Stringency :

Two aspects– limit– area of control (boundary

conditions)

Page 19: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Factors influencing stringency

• A table has been made summing up the most important factors. In rank order– Limit annex 3– Boundary conditions annex 3 – Limit of annex 10 (anchor point, slope and margin)– Boundary conditions annex 10

• So: annex 3 has more influence on stringency than annex 10 itself

Page 20: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Limit A3 Limit A10

Multiplier effect (kp factor): up to 1.7

1 dB lack of stringency in Annex3 means:

Up to 1.7 dB less stringent in Annex 10

PM: higher PMR less stringent limit

Page 21: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Boundary Condition Acceleration Annex 3

• Boundary condition amax=2 m/s2 forces vehicles to higher gear/lower revs

• Means: anchor point annex 10 is going left

• Means: Annex 10 limitation weaker

• For Annex 3 little effect due to kp compensation

Page 22: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Anchor point Annex 10 to the left

Results in higher limit curve annex 10

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Page 23: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Advise of ASEP Group to GRB

Annex 3:

Reconsider 2 m/s2 boundary condition

– little effect on annex 3 result– increases significantly effectiveness Annex

10

Page 24: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Limitation Annex 10

Anchor Point, Slope, Margin

That’s our job, so we are dealing only with a part of the stringency issue

Page 25: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Area of controldue to boundary conditions Annex

10General: 3 forces to lower the engine speed

Engine speed: boundary means direct limitation

Vehicle speed: (related to test tracks lay out)Lower speed lower revs

Acceleration: skipping low gears high revs not covered

Page 26: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

By the way

Learned from R41 ad hoc Motorcycle group:

Direct limit on the Lwot,i

Page 27: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Results Limitation Discussion

* in relation to discussion about Annex 3 Boundary Condition Acc < 2 m/s2

Chairman Stringent

Compromise To be found

OICA Lenient

Ann 10 boundary acceleration

No limit ? 4.0 m/s2

Ann 10 boundary Engine speed

90% of max

? 60-90% of max (dep PMR)

Anchor point* ? Maximum slope 5 ? 6-7 Margin 1 ? 3

Potential elements of the compromise

Bonus silent vehicles Not testing i+1, i+2

Additional tests allowed if one test fails

Direct Limit on Lwoti

Page 28: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Other Issues

• Treatment CVT’s (raised by Japan)• Replacement Silencers: workload

and practical problems (raised by Clepa)

Page 29: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Remaining work to be done:

Fine tuning method (CVT’s)Finalize WordingStringency

Page 30: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Thank You

Page 31: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,
Page 32: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Need for ASEP control range at low engine speed (example 1)

Noise does not decrease at low engine speed

Page 33: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Need for ASEP control range at low engine speed (example 2)

Noise increases at low engine speed

Page 34: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Effect of changes in measuring method (example of 2 vehicles)

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Limit

VW Polo 33 kW (modelyear 1998)

Mercedes C 142 kW (model year 1998)

assumed introduction 5 speed gearboxes

81/334/EEC measure in 2+3 gear

assumed introduction absorbing test track

92/97/EEC introduction ISO surface

96/20/EEC allowance worn tyres

84/372/EEC measure "sportscars" in 3rd gear

Page 35: Report GRB ad hoc Working Group ASEP by the Chairman of the ASEP WG GRB 49; February 2009 Informal document No. GRB-49-07 (49th GRB, 16-18 February 2009,

Effect of changes in measuring method (estimated effect total

population)

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3rd2nd + 3rd

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normal

gear tested

test track surfaceand tyres

Changes inmeasuring method