tuv sud methodolgy and tests results
TRANSCRIPT
TÜV SÜD Automotive Tire Test 2010/2011
Methodology & Test Results 235/35 R19 and 255/35 R19
TÜV SÜD Automotive GmbH
TÜV SÜD – The Corporation
TÜV SÜD Automotive GmbH
FACTS & FIGURES
Technical service provider
> 16,000 staff on over 600 locations worldwide
Sales volume in 2010: € 1.55 billion
Headquarters: Munich (Germany)
Regions: Western Europe, Central Eastern Europe,
Middle East/Africa, Asia-Pacific and Americas
Over 140 years of business success
Consulting Testing Certification Training
on behalf of industry, trade and commerce, public institutions and private individuals.
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TÜV SÜD Automotive – The Company
TÜV SÜD Automotive GmbH
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Services
Consulting
Testing
Homologation
Independent research and development
partner of the automotive industry
• ~ 400 employees
• Competence centers in Europe: Garching,
Filderstadt, Heimsheim and Prague
AREAS OF BUSINESS
Safety
Comfort
Environment
Key Targets
TÜV SÜD Automotive – Tire Testing
TÜV SÜD Automotive GmbH
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BACKGROUND
TÜV SÜD Automotive is performing tire tests for more than 30 years, in indoor and outdoor testing.
Tire tests are done for the purpose of
- development (e.g. new patterns)
- homologation (e.g. ECE R30, ECE R117,…)
- consumer information and marketing (e.g. EC Tire Labeling, Benchmark Tests,… )
A key element especially for tests with the target of development and consumer information is a comprehensive
investigation of the performance of the tire. This concerns all important criteria, such as
- Safety features, especially in emergency situations (e.g. stopping distance)
- Driving experience (e.g. handling, ride & comfort)
- Environment and cost-effectiveness (e.g. rolling resistance & fuel consumption, service life)
A balanced performance, i.e. good to very good achievements in any of the tested criteria is the key factor for a
good global result and customer satisfaction.
TÜV SÜD Automotive – Tire Testing
TÜV SÜD Automotive GmbH
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BRAKING TESTS
A short braking distance is a highly important feature of active driving safety, on all kinds of road surface.
Legal Backgrounds: Wet: ECE R117 and EC Dir. 222/2009 (Tire Labelling)Dry: No requirements for a minimum performance
Wet Braking Parameters (acc. to ECE R117)
- speed from 80-20 km/h, full ABS braking
- uniform inflation pressure (220 kPa)
- tyre load of 60 - 90% of max. load capacity
Dry Braking Parameters
- from 100-0 km/h, full ABS braking
- inflation pressure acc. to car’s manual
TÜV SÜD Automotive – Tire Testing
TÜV SÜD Automotive GmbH
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BRAKING TEST
Practical Test Implementation (I)
Before the measuring runs:
- Installation and launch of metrology equipment (e.g. V-Box)
- Marking the braking lane and braking point (e.g. with pylons or
ground markers) to make sure that the same area and traces are
used throughout the test for all tires.
-Do some runs with non-test tires to condition the track and heat up
the brakes of the car.
Before the start:
- for wet braking: Make sure that the surface complies with the requirements of ECE R117, e.g. with a pendulum
tester to measure the friction level and a sand patch application to determine the roughness of the surface.
TÜV SÜD Automotive – Tire Testing
TÜV SÜD Automotive GmbH
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BRAKING TEST
Practical Test Implementation (II)
Procedure:
- Enter the braking lane with speed approx. 5 km/h higher than the initial speed (e.g. on wet surface, ~ 85 km/h)
- Apply full pedal pressure at the braking point and brake down to standstill
- The metrology system automatically calculates the distance travelled in the chosen speed range (e.g. Wet 80 – 20)
Test Sequence/Repetitions:
If there are e.g. three competitors (T1, T2, T3) in the test, the testing order (with T1 = reference) would be :
T1 (3) → T2 (6) → T3 (6) → T1 (3). For wet braking, a Standard Reference Tests Tire is used.
Evaluation:
The basic evaluation is the comparison of the mean acceleration of the test tires compared to the mean
acceleration of the reference tire (ref tire = 100%).
TÜV SÜD Automotive – Tire Testing
TÜV SÜD Automotive GmbH
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DRY HANDLING TEST
The performance of the tires has an overriding influence on the driving experience of a car. In a handling test, theinfluence of the tire on the driving feeling and the driving safety (esp. in emergency situations) is assessed.
Legal requirements: There are no legal requirements or uniform test standards for a handling test.
The handling test is normally subdivided into two parts:
Objective part: measurement of lap times on a specially designedhandling circuit.The lap times represent to a certain extent the grip level of a tire in longitudinal (traction/braking) and lateral (cornering) direction.The lap times alone do not allow to draw conclusions on the ride properties, the driving safety and the performance at the limits.
Subjective part: assessment by the test driver of different ride andhandling properties, the driving safety and the performance in emergency situations.
TÜV SÜD Automotive – Tire Testing
TÜV SÜD Automotive GmbH
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DRY HANDLING TEST
Before the start: Selection of the test vehicle
- sufficient engine power
- representative for the market and the tire range
- tire size to be tested has to be released as OE or retrofitting size
- powerful, reliable and firm brake system
Before the test runs:
- Install the metrology equipment for taking the lap times (optical or radio transmitter near the track, receiver and
display inside the car)
- Some laps are driven with non-test tires to heat up the engine and the brakes and to make the driver familiar to
the track and the conditions (until lap times are constant within <~0.3 sec)
TÜV SÜD Automotive – Tire Testing
TÜV SÜD Automotive GmbH
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DRY HANDLING TEST
Test Sequence/ Repetitions: Similar as in the braking tests
One tire (part of the test program or not) is chosen to serve as control or reference tire . This tire is run as the first
tire and then repeatedly in the progress of the test in order to be able to detect and correct changes of the ambient
conditions (for lap times) and to recall the “reference state” to the driver (for the subjective assessment).
Criteria for the subjective assessment
The subjective assessment is based on a grading scale with scores from 1 (= worst) to 10 (= best).
The criteria are allocated to different areas of performance:
►Response and Feedback ► Steering angle and Preciseness
► Directional Control, Grip and Balance ► Driving safety and performance at the limits
Evaluation: One subjective global score for the handling performance (made up from individual scores of the 4
areas) & the lap times (converted into an average speed, expressed as percentage).
TÜV SÜD Automotive – Test Framework
TÜV SÜD Automotive GmbH
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TEST DETAILS
SIZES IN TEST:
235/35 R19 91Y (tested in 2010) 255/35 R19 96 Y (tested in 2011)
TIRE RANGE:
Sport/Supersport: UHP tires for sports cars and powerful executive / luxury class cars
TEST CRITERIA (among others):
- Wet Braking - Dry Braking - Dry Handling
COMPETITORS:
- Premium brand tire manufacturers with their recent patterns and in the specifications available in the market
at the time of testing.
TÜV SÜD Automotive – Test Framework
TÜV SÜD Automotive GmbH
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DETAILS – WET BRAKING
TEST LOCATION: RDW Test Center Lelystad (NL)
Proving ground of the Dutch Type Approval Authority
Approved wet braking track according to ECE R117
with wet asphalt surface (low µ, BPN >50)
All tests have been carried out at
ground temperatures above 15°C.
TÜV SÜD Automotive – Test Framework
TÜV SÜD Automotive GmbH
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DETAILS – DRY TESTS
TEST LOCATION: ATP Papenburg (Germany)
Independent proving ground, linked to Daimler AG.
HANDLING TRACK : Reproduction of small “Hockenheimring”
Track Length: 2600m
The dry braking tests were done at ATP, too.
TÜV SÜD Automotive – Test Framework
TÜV SÜD Automotive GmbH
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DETAILS – TEST VEHICLES
Size 235/35 R19
Audi TT 2.0 TFSI (200 hp) Audi S4 Avant (333 hp) (wet braking on normal Audi A4 2.0 TDI)
Size 255/35 R19
TÜV SÜD Automotive – Test Results
BRIDGESTONE
POTENZA S001
CONTI
SPORTCONTACT 5PDUNLOP
SP SPORT MAXX GT
MICHELIN
PILOT SUPER SPORT
PIRELLI
P ZERO
COMPETITORS - 235/35 R19 91 Y (test in 2010)
The competitor tires in
the test have been
purchased by TÜV SÜD
Automotive on the
market from normal tire
dealers and wholesalers.
GOODYEAR
EAGLE F1 ASYM.
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DETAILS – TEST TIRES
TÜV SÜD Automotive – Test Results
TÜV SÜD Automotive GmbH
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DETAILS – TEST RESULTS
SIZE 235/35 R19 91 Y
WET BRAKING PERFORMANCE, low µ 80-20 km/h, RELATIVE TO MICHELIN TIRE
The performance of the Michelin
tire represents 100%.
The dotted red line marks the
average performance of all other
competitor tires in this segment
compared to the Michelin.
All values are mathematically
rounded to one decimal digit.
Difference Best /Worst Tire:
~ 5.0 metersØ = 95.0 %
TÜV SÜD Automotive – Test Results
TÜV SÜD Automotive GmbH
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DETAILS – TEST RESULTS
SIZE 235/35 R19 91 Y
DRY BRAKING PERFORMANCE, 100-0 km/h, RELATIVE TO MICHELIN TIRE
The performance of the Michelin
tire represents 100%.
The dotted red line marks the
average performance of all other
competitor tires in this segment
compared to the Michelin.
All values are mathematically
rounded to one decimal digit.
Difference Best /Worst Tire:
~ 2.4 metersØ = 96.3 %
TÜV SÜD Automotive – Test Results
TÜV SÜD Automotive GmbH
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DETAILS – TEST RESULTS
SIZE 235/35 R19 91 Y
DRY HANDLING PERFORMANCE
Grading Scale: 10 = outstanding, 9 = excellent, 8 = very good, 7 = good, 6 = satisfactory,
5 = just acceptable; 4 = unsatisfactory 3 = poor, 2 = very poor; 1 = unacceptableDifference Best /Worst Tire: ~ 2.1 km/h (≈ 1.6 sec)
Ø = 98.6 %
GLOBAL RATING SCORE AVERAGE SPEED [%]
TÜV SÜD Automotive – Test Results
BRIDGESTONE
POTENZA S001
CONTI
SPORTCONTACT 5P (MO)
DUNLOP
SP SPORT MAXX GT (AO)
MICHELIN
PILOT SUPER SPORT
PIRELLI
P ZERO (MO)
COMPETITORS - 255/35 R19 96 Y (test in 2011)
All tires in the test have
been purchased by TÜV
SÜD Automotive on the
market from normal tire
dealers and wholesalers.
GOODYEAR
EAGLE F1 ASYM. 2
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DETAILS – TEST TIRES
TÜV SÜD Automotive – Test Results
TÜV SÜD Automotive GmbH
Page 20
DETAILS – TEST RESULTS
SIZE 255/35 R19 96 Y
WET BRAKING PERFORMANCE, low µ 80-20 km/h, RELATIVE TO MICHELIN TIRE
The performance of the Michelin
tire represents 100%.
The dotted red line marks the
average performance of all other
competitor tires in this segment
compared to the Michelin.
All values are mathematically
rounded to one decimal digit.
Difference Best /Worst Tire:
~ 2.3 metersØ = 97.7 %
TÜV SÜD Automotive – Test Results
TÜV SÜD Automotive GmbH
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DETAILS – TEST RESULTS
SIZE 255/35 R19 96 Y
DRY BRAKING PERFORMANCE, 100-0 km/h, RELATIVE TO MICHELIN TIRE
The performance of the Michelin
tire represents 100%.
The dotted red line marks the
average performance of all other
competitor tires in this segment
compared to the Michelin.
All values are mathematically
rounded to one decimal digit.
Difference Best /Worst Tire:
~ 1.2 metersØ = 97.3 %
TÜV SÜD Automotive – Test Results
TÜV SÜD Automotive GmbH
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DETAILS – TEST RESULTS
SIZE 255/35 R19 96 Y
DRY HANDLING PERFORMANCE
Grading Scale: 10 = outstanding, 9 = excellent, 8 = very good, 7 = good, 6 = satisfactory,
5 = just acceptable; 4 = unsatisfactory 3 = poor, 2 = very poor; 1 = unacceptableDifference Best /Worst Tire: ~ 1.9 km/h (≈ 1.3 sec )
Ø = 99.0 %
GLOBAL RATING SCORE AVERAGE SPEED [%]