Document ID: chunk:federal_register_of_legislation:F2010C00150:front:0:p39
Version: federal_register_of_legislation:F2010C00150
Segment Type: other
Provision Reference: 
Character Range: 104757–107673

appendix 3 to this annex;

         5.3.6. However, in the tests provided in paragraphs 5.3.1., 5.3.2., 5.3.3., 5.3.4. and 5.3.5. of this annex, brief periods of wheel-locking shall be allowed. Furthermore, wheel-locking is permitted when the vehicle speed is less than 15km/h; likewise, locking of indirectly controlled wheels is permitted at any speed, but stability and steerability must not be affected and the vehicle must not exceed a yaw angle of 15 degrees or deviate from a 3.5m wide lane;

         5.3.7. During the tests provided in paragraphs 5.3.4. and 5.3.5. of this annex, steering correction is permitted, if the angular rotation of the steering control is within 120 degrees during the initial 2 seconds, and not more than 240 degrees  in all. Furthermore, at the beginning of these tests the longitudinal median plane of the vehicle must pass over the boundary between the high- and low-adhesion surfaces and during these tests no part of the tyres must cross this boundary.

Annex 6 - Appendix 1

SYMBOLS AND DEFINITIONS

TABLE : SYMBOLS AND DEFINITIONS

SYMBOL      NOTES

E           Wheelbase

epsilon     the adhesion utilized of the vehicle: quotient of the maximum braking rate with the anti- lock system operative (zAL) and the coefficient of adhesion (k)

epsiloni    the epsilon - value measured on axle i (in the case of a motor vehicle with a category 3 anti-lock system)

epsilonH    the epsilon - value on the high-adhesion surface

epsilonL    the epsilon - value on the low-adhesion surface

F           force ( N )

Fdyn        normal reaction of road surface under dynamic conditions with the anti-lock system operative

Fidyn       Fdyn on axle i in case of power-driven vehicles

Fi          normal reaction of road surface on axle i under static conditions

FM [1/]     total normal static reaction of road surface on all wheels of power-driven vehicle

FMnd   1/   total normal static reaction of road surface on the unbraked and non-driven axles of the power-driven vehicle

FMd 1/      total normal static reaction of road surface on the unbraked and driven axles of the power- driven vehicle

FWM   1/    0.01 FMnd + 0.015 FMd

g           acceleration due to gravity (9.81m/s2)

h           height of centre of gravity specified by the manufacturer and agreed by the Technical Service conducting the approval test

k           coefficient of adhesion between tyre and road

kf          k-factor of one front axle

kH          k-value determined on the high-adhesion surface

ki          k-value determined on axle i for a vehicle with a category 3 anti-lock system

kL          k-value determined on the low-adhesion surface

klock       value of adhesion for 100% slip

kM          k -factor of the power-driven vehicle

kpeak       maximum value of the curve "adhesion versus slip"

kr          k -factor of one rear axle

P           mass of individual vehicle (kg)

R