Continental SportContact 6 Maximum GRIP · Which Variants have the Highest Wet Grip in Lab &...

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Continental SportContact 6 Maximum GRIP

www.continental-tyres.com

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SportContact 6

Maximum GRIP – Driving Session Agenda

27/08/15

2 © Continental AG

Maximum Grip: Wet grip compound performance evaluation 1

Maximum Grip: Wet braking driving session 2

Maximum Grip: Introduction to Grip Testing 1

Parallel groups:

Result Evaluation 2

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SportContact 6 27/08/15

3 © Continental AG

Maximum Precision Target Conflict

Wet grip Driving precision

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SportContact 6 27/08/15

4 © Continental AG

Maximum Precision Performance Survey of Test Program

Wet grip

Driving precision

+

EVO 2

-

SportContact 6

+

+

-

EVO 1

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SportContact 6 27/08/15

5 © Continental AG

Tread

Block

Road

What is Grip?

› Grip

is needed to transfer forces from the car

to the road in the contact patch

› Grip Mechanisms

are different on different surfaces

Dry Wet

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SportContact 6 27/08/15

6 © Continental AG

Flexing Zone

Rigid Zone

Load Zone

Grip Zone Grip Zone

Tread compound, pattern

Load Zone

Base, capply, belt

Flexing Zone

Sidewall, ply, innerliner

Rigid Zone

Rimstrip, apex, bead

Construction of a Tyre Grip is Generated in the Contact Patch (Grip Zone)

The Grip Zone is most important for grip generation,

but finally the whole tyre construction is relevant, especially for lateral forces.

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SportContact 6

Black Chili enjoyment for ...

› Braking

› Acceleration

› Cornering

… on wet and dry roads.

The SportContact 6 – Perfect Grip New Generation of Black Chili Compounding for Perfect Grip

27/08/15

7 © Continental AG

Acceleration Braking

Cornering

Cornering

Power

Maximum Grip in All Directions

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SportContact 6 27/08/15

8 © Continental AG

Leonardo da Vinci

*1452 – 1519

Ffr

Fx=m2 g

v=const

FN=m1 g

Simplest Friction Measurements

› Coefficient of friction µ is a measure of grip

μ

Fx

FN

m2

m1

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SportContact 6

Friction Coefficient µ of Different Road Conditions Relative Contribution of Friction Mechanisms

27/08/15

9 © Continental AG

µ-s

ha

re

Hysteresis

Adhesion

Hysteresis

Adhesion

Viscous

Dry Wet

Fri

cti

on

Co

eff

icie

nt

µ

Dry Wet

Hydro-

planing

0.0

0.2

0.4

0.6

0.8

1.0

1.2

Wet

Dry

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SportContact 6

How Large is the Real Contact Area Between Tyre and Road?

27/08/15

10 © Continental AG

?

Footprint size

Pa

ttern

vo

id

Road roughness

Tire: 245/35 R19

Load: 4460 N

Infl.Press.: 2.5 bar

Gross Contact Area:

160 cm²

Netto Contact Area:

120 cm²

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SportContact 6

Let‘s measure it!

27/08/15

11 © Continental AG

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SportContact 6

How large is the real contact area between tire and road?

27/08/15

12 © Continental AG

› In reality, much smaller than people think

› Reason: rubber does not fully penetrate into the road

Only about 20% of tread

in contact with road asperities*

A=24 cm2/tire

~5 cm x 5 cm

*: at the resolution of the foil

used in the demonstration

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Continental SportContact 6 Maximum Grip: Introduction to Grip Testing www.continental-tyres.com

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SportContact 6 27/08/15

14 © Continental AG

Recipe

E’’(ω)

log ω

Viscoelastic

Material

Properties

Performance

Simulation

Laboratory

Performance

Tyre

Manufacturing

Tyre

Performance

Pathway: From Compound Recipe to Tyre Performance

Feedback loop

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SportContact 6 27/08/15

15 © Continental AG

Recipe

E’’(ω)

log ω

Viscoelastic

Material

Properties

Performance

Simulation

Laboratory

Performance

Tyre

Manufacturing

Tyre

Performance

Pathway: From Compound Recipe to Tyre Performance

Pre-selection in lab

Faster Feedback Loop

+ More variants

+ More conditions

+ Efficient

- No tyre performance

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SportContact 6 27/08/15

16 © Continental AG

Various Ways to Test Grip Today

Laboratory Laboratory on the Road Vehicle Test

› High Speed Linear Friction Tester › Portable Friction Tester › Braking Car

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SportContact 6 27/08/15

18 © Continental AG

road

Modern Lab-Testing: High Speed Linear Friction Tester Mimic Tread Block Conditions during Braking in the Lab

Test Parameter

› Precise control of environmental conditions

› Temperature range from -25 °C to +60 °C

› Defined friction surfaces e.g. concrete, asphalt (copy of braking tracks)

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SportContact 6 27/08/15

19 © Continental AG

Lab-Testing: Friction Measurements High Speed Linear Friction Tester

Dry & Wet Friction of Rubber Tread Block

0 Time

v(t

)

0 Time

Fz [

N]

v(t)

p Fx(t) Fz(t)

v0

tFN

Friction coefficient µ

Friction Force

Normal Force

Coefficient of friction µ

0

Fz [

N]

0

Fz [

N]

p Surface

T Rubber

Output

Inputs

Time

Time

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SportContact 6

Test Parameter

› Same principle as for the lab-device

› On actual braking tracks

› Normal loads up to 240 N

› Siding speed up to 2 m/s

› No control of ambient conditions

27/08/15

20 © Continental AG

Outdoor Lab-Testing Portable Friction Tester

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SportContact 6 27/08/15

21 © Continental AG

Recipe

E’’(ω)

log ω

Viscoelastic

Material

Properties

Performance

Simulation

Laboratory

Performance

Tyre

Manufacturing

Tyre

Performance

Pathway: From Compound Recipe to Tyre Performance

Feedback loop

Feedback Loop

++ Tyre performance

- High costs

- Slower feedback

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SportContact 6 27/08/15

22 © Continental AG

Introduction to Wet Braking Tests at Continental Vehicle Based Outdoor Test

› Evaluation of stopping distance

› Reflecting daily life practice: emergency braking with ABS control

› Various test tracks (asphalt, concrete, different wet skid resistance levels)

› Rail guided system (higher reproducibility)

› Controlled water layer height

› GPS based measurement of stopping distance

› No control of environmental conditions

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SportContact 6 27/08/15

23 © Continental AG

ABS Wet Braking Data Recording and Measurement Chain

Dis

tance

Sig

nal

Digitalker III (Data Recorder)

Trigger-Signal

Digital Velocity Display

Velocity Box

GPS-Antenna

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SportContact 6

Tyre

Performance

Tyre

Performance

Laboratory

Performance

27/08/15

24 © Continental AG

Recipe

E’’(ω)

log ω

Viscoelastic

Material

Properties

Performance

Simulation

Laboratory

Performance

Tyre

Manufacturing

Pathway: From Compound Recipe to Tyre Performance

Feedback loop

Tyre Lab

Performance

AIBA

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SportContact 6 27/08/15

25 © Continental AG

Rail guided wet braking

Rail guided wet braking

Rail guided aquaplaning

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SportContact 6 27/08/15

26 © Continental AG

Automated Indoor Braking Analyzer Vehicle based Indoor Test

› Equivalent procedures for

in- and outdoor brake tests

› Temperature control

› Ambient air

› Road/water surface

› Controlled water layer height

› Exchangeable road surfaces

› Fully automatic braking

› All-year testing

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SportContact 6

› Video AIBA

27/08/15

27 © Continental AG

AIBA Automated Indoor Braking Analyzer

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Continental SportContact 6 Maximum Grip: Wet Grip Performance Evaluation Maximum Grip: Introduction to grip testing

www.continental-tyres.com

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SportContact 6 27/08/15

29 © Continental AG

Agenda Which Variants have the Highest Wet Grip in Lab & Outdoor?

Three parallel groups 30 min.

Vehicle Test

Maximum Grip:

Wet Braking Driving Session

PFT Da Vinci

Maximum Grip:

Wet Grip Compound Performance Evaluation

Rotation after 15 minutes

› 3 Tyre Variants: EVO 1, EVO 2, SC6

› Tread compounds for laboratory based evaluation

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Continental SportContact 6 Maximum Grip: Results Evaluation Maximum Grip: Introduction to grip testing

www.continental-tyres.com