Tuv sud methodolgy and tests results

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

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.
Page 2

TÜV SÜD Automotive – The Company

AREAS OF BUSINESS

Independent research and development
partner of the automotive industry
• ~ 400 employees
• Competence centers in Europe: Garching,
Filderstadt, Heimsheim and Prague

Services Key Targets

Consulting Safety

Testing Comfort

Homologation Environment
Page 3

TÜV SÜD Automotive – Tire Testing

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.
Page 4


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
Page 5


BRAKING TEST
Practical Test Implementation (I)
 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.

 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.
Page 6


BRAKING TEST
Practical Test Implementation (II)
 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.

 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)

 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%).
Page 7


DRY HANDLING TEST
 The performance of the tires has an overriding influence on the driving experience of a car. In a handling test, the
influence 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 designed
handling 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 and
handling properties, the driving safety and the performance in emergency situations.
Page 8


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)

Page 9


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).
Page 10

TÜV SÜD Automotive – Test Framework

TEST DETAILS

 TIRE RANGE:
Sport/Supersport: UHP tires for sports cars and powerful executive / luxury class cars

 SIZES IN TEST:
235/35 R19 91Y (tested in 2010) 255/35 R19 96 Y (tested in 2011)

 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.
Page 11


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.
Page 12


DETAILS – DRY TESTS
TEST LOCATION: ATP Papenburg (Germany) HANDLING TRACK : Reproduction of small “Hockenheimring”
Independent proving ground, linked to Daimler AG.

Track Length: 2600m

The dry braking tests were done at ATP, too.
Page 13


DETAILS – TEST VEHICLES

Size 235/35 R19 Size 255/35 R19

Audi TT 2.0 TFSI (200 hp) Audi S4 Avant (333 hp)
(wet braking on normal Audi A4 2.0 TDI)

Page 14

TÜV SÜD Automotive – Test Results

DETAILS – TEST TIRES
COMPETITORS - 235/35 R19 91 Y (test in 2010)

The competitor tires in
the test have been
purchased by TÜV SÜD
BRIDGESTONE CONTI DUNLOP Automotive on the
POTENZA S001 SPORTCONTACT 5P SP SPORT MAXX GT
market from normal tire
dealers and wholesalers.

GOODYEAR MICHELIN PIRELLI
EAGLE F1 ASYM. PILOT SUPER SPORT P ZERO
Page 15


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:
Ø = 95.0 %
~ 5.0 meters
Page 16


SIZE 235/35 R19 91 Y
DRY BRAKING PERFORMANCE, 100-0 km/h, RELATIVE TO MICHELIN TIRE
Ø = 96.3 %
~ 2.4 meters
Page 17


SIZE 235/35 R19 91 Y
DRY HANDLING PERFORMANCE
GLOBAL RATING SCORE AVERAGE SPEED [%]

Ø = 98.6 %
Grading Scale: 10 = outstanding, 9 = excellent, 8 = very good, 7 = good, 6 = satisfactory,
5 = just acceptable; 4 = unsatisfactory 3 = poor, 2 = very poor; 1 = unacceptable
Difference Best /Worst Tire: ~ 2.1 km/h (≈ 1.6 sec)
Page 18


DETAILS – TEST TIRES
COMPETITORS - 255/35 R19 96 Y (test in 2011)

All tires in the test have
been purchased by TÜV
SÜD Automotive on the
BRIDGESTONE CONTI DUNLOP
market from normal tire
POTENZA S001 SPORTCONTACT 5P (MO) SP SPORT MAXX GT (AO)
dealers and wholesalers.

GOODYEAR MICHELIN PIRELLI
EAGLE F1 ASYM. 2 PILOT SUPER SPORT P ZERO (MO)
Page 19


SIZE 255/35 R19 96 Y
WET BRAKING PERFORMANCE, low µ 80-20 km/h, RELATIVE TO MICHELIN TIRE
Ø = 97.7 %
~ 2.3 meters
Page 20


SIZE 255/35 R19 96 Y
DRY BRAKING PERFORMANCE, 100-0 km/h, RELATIVE TO MICHELIN TIRE
Ø = 97.3 %
~ 1.2 meters
Page 21


SIZE 255/35 R19 96 Y
DRY HANDLING PERFORMANCE
GLOBAL RATING SCORE AVERAGE SPEED [%]

Ø = 99.0 %
Grading Scale: 10 = outstanding, 9 = excellent, 8 = very good, 7 = good, 6 = satisfactory,
5 = just acceptable; 4 = unsatisfactory 3 = poor, 2 = very poor; 1 = unacceptable
Difference Best /Worst Tire: ~ 1.9 km/h (≈ 1.3 sec )
Page 22

Tuv sud methodolgy and tests results

Recomendados

Recomendados

Más contenido relacionado

Similar a Tuv sud methodolgy and tests results

Similar a Tuv sud methodolgy and tests results (20)

Más de Estoril 2011

Más de Estoril 2011 (13)

Último

Último (20)

Tuv sud methodolgy and tests results