automotive tyre rolling resistance regulation...v.petrushov –nami (rf) 24/09/2007 2 in rf the...
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Automotive Tyre Rolling Resistance RegulationThree modern key problems:
1. METHOD(s) – under final upgrading now.2. EQUIPMENT – requires extended preparing
for wide RR control in tyre manufacturer laboratories.
3. NORMS – under preparation by Tyre Industry now.
1V.Petrushov –NAMI (RF) 24/09/2007
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Methods normative documents in
Full range 90(120) - 0
ISO 18164 Amendment, Annex D “Deceleration method based on time-distance measuring”
80
ISO(ETRTO) CD 28580 “Tyre Rolling Resistance measurement method designed to ease international cooperation and, possibly, regulation building”.
115 - 15
80 (50,90,120)
Test speed km/h
SAE J2452 "Stepwise coastdown methodology for measuring rolling resistance"
ISO 18164 “Methods of Measuring Rolling Resistance – Passenger Car, Truck & Bus, and Motorcycle Tyres”
Standard
development (end 2008)/action
V.Petrushov –NAMI (RF) 24/09/2007 2
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In RF the subject of ISO CD 18164 Amd being standardized by GOST R 52102 is under wide industrial testing from 2003 in 3 tyre plants and NAMI (see slides below)
In the view of sufficient time space before RR Regulation introduction date RF delegation
consider necessary to use this period for:
•upgrading RR measurement methods, •designing not expensive equipment •data and experience collecting
V.Petrushov –NAMI (RF) 24/09/2007 3
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Rolling Resistance Test Machine (400 000-450 000 $)
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Measurement kit for anyone drum test machine (30 000-35 000$ with software)
V.Petrushov –NAMI (RF) 24/09/2007 5
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Measurement kit mounting on standard test machine
Retroreflectingrevolution sensors
temperature sensors
measurement device
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Pilot lot of measurement kit for new deceleration method
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"Ircon-111" RR measurement system in Nizhnekamsk tyre plant (RF)
8V.Petrushov –NAMI (RF) 24/09/2007
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"Ircon-111" RR measurement system in Omsk tyre plant
9V.Petrushov –NAMI (RF) 24/09/2007
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"Ircon-111" RR measurement system in Kirov tyre plant
10V.Petrushov –NAMI (RF) 24/09/2007
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NAMI Rolling resistance test machine with “Ircon-111” measurement system
11V.Petrushov –NAMI (RF) 24/09/2007
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Durability on the bench, km RR Coefficient
0,0142 0,01430,015
0,01540,0162 0,0164
0,0201 0,0204 0,0207 0,0209 0,0212 0,0215 0,0218 0,0221 0,022351480
40250
35910
23760
25850
21075
9765
25910
22970
27450
13320
1575014400
34582
21600
Tyre plant lab tests: RR-Durability correlation
V.Petrushov –NAMI (RF) 24/09/2007 12
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0.9/1.5(in general)
Repeatability / reproducibility variance ratio, %
352Number of RR measurements by both variant
176
176
4
2
22
Total number of measurements by short test method
Total number of measurements by basic method
Number of RR measurements at each mounting
Number of mounting of each tyre on the bench
Total number of ETRTO lot of tested tyres
Each tyre was tested 8 times by basic and 8 times by short methoEach tyre was tested 8 times by basic and 8 times by short methods.ds.
2007: TYRE RR CORRELATION TESTS FOR REPEATABILITY AND REPRODUCIBILITY DEFINITION OF
ISO CD 18164 AMD METHOD WAS PERFORMED.
V.Petrushov –NAMI (RF) 11/07/2007 1313
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Proposal for mandatory RR grading for « summer » tyres (80 km/h)
>13.0off-range
>15off-range
11.8–13.0D10.6–11.8C
<10.6BA
CV
10.5–12.0D9.0–10.5C7.5–9.0B
<7.5A
LT
12–13.513.0–15.0D10.5–1211.0–13.0C9.0–10.5<11.0B
<9.0A
PC
ETRTO 2007NAMI (RF) 2002CATEGORYTYPE
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2 variants of RR standardizing.Regulation
(limitation of maximum RR level).Shortcomings:1. Cumbersome system of different
tyre’s sizes requiring an individual approach and a finding of compromise between manufacturers and consumers during long time.
2. Great inertia of properties enhancement and norm revision.
3. Limitation of manufacturer and user relation especially at perspective orders.
4. Difficulties of alternative choice of Crand grip coefficients.
End-user informationAdvantages:1. Satisfaction of consumer’s rights
to be informed without opportunity of any limitation in choice of tyres.
2. Consumer’s opportunity to choose needed correlation between Cr and grip coefficient. (Modern end-users have got an appropriate competence for it.)
3. Elimination the necessity to introduce numerous norms due to different tyre’s types and sizes.
The Information may occurs more effective then the Regulation asa stimulus of tyre quality support.
16
RF delegation insert proposal on this matter as modification of previous and very soft for tyre industry.
V.Petrushov –NAMI (RF) 24/09/2007
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ISO 18164 Amendment, Annex D “Deceleration method based on time-distance measuring” has 4 main features:
Using time-distance dependence for rolling resistance determination.Technology reduced to the high accuracy of time spans measurement.Usable and of enough accuracy moment inertia determination method.Simple and low cost equipment with the possibility of rolling resistance measuring on any tyre test machines and unified with the same for road tests
17
One can hope that method under standardization may expand an ability to choice standard effective method of tyre rolling resistance
determination at the period of RR norms introduction .
V.Petrushov –NAMI (RF) 24/09/2007
Thank you for your attention!