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Informal document No. 14 (49th GRRF, 29 Jan. – 3 Feb. 2001, Agenda Item 6.2) Reference Data for Wet μMeasurement (submitted by the experts of Japan) 1. Age Influence of Wet Friction Coefficient on Test Surface Test Tyre : 205/65R15 ABS Wet Braking Distance (V=80km/h)

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slide1

Informal document No. 14

(49th GRRF, 29 Jan. – 3 Feb. 2001, Agenda Item 6.2)

Reference Data for Wet μMeasurement(submitted by the experts of Japan)

1. Age Influence of Wet Friction Coefficient on Test Surface

Test Tyre : 205/65R15

slide2

ABS Wet Braking Distance (V=80km/h)

ABS Wet Braking Distance (V=80km/h)

Test Tire

Car A

Car B

Car C

Car D

Test Tire

Car A

Car B

Car C

Car D

P195/75R14

ASTM

44.62

39.43

43.37

43.74

P195/75R14

ASTM

100.0

100.0

100.0

100.0

(

0.56)

(1.00)

(0.37)

(0.95)

195/70R14

X

110.6

111.8

=

σ

195/70R14

X

40.35

35.25

205/60R15

Y

112.0

129.7

117.3

122.1

(0.64)

(0.62)

205/60R15

Z

121.1

125.3

121.3

125.5

39.82

205/60R15

Y

30.40

36.98

35.82

(0.65)

(0.35)

(1.29)

(0.31)

Test Condition

Load : Ave. 390kg/tire

205/60R15

Z

36.83

31.46

35.75

34.85

IP : 180kPa (ASTM), 190kPa (A,B,C)

(0.46)

(0.41)

(0.32)

(0.45)

Water Depth : 1mm

Air Temperature : 24 - 30

ABS Wet Braking Distance

50

45

40

Braking Distance (m)

35

ASTM

X

30

Y

Z

25

Car A

Car B

Car C

Car D

Tire Y

Tire Z in the case of Car A & B ( Level of significance : 1% )

2. Test Data of Stopping Distance by Using Actual Vehicles

ABS Wet Braking Distance

140

130

120

Braking Distance (relative %)

ASTM

X

110

Y

Z

100

90

Car A

Car B

Car C

Car D