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
Public
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.
Public
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
Public
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)
Public
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
Public
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
Public
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
Public
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
Public
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
Public
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
Public
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
Bitte decken Sie die schraffierte Fläche mit einem Bild ab.
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(24,4 x 7,6 cm)
Continental SportContact 6 Maximum Grip: Results Evaluation Maximum Grip: Introduction to grip testing
www.continental-tyres.com