Document ID: chunk:federal_register_of_legislation:F2010C00150:front:0:p29
Version: federal_register_of_legislation:F2010C00150
Segment Type: other
Provision Reference: 
Character Range: 79030–81736

time t shall not exceed 20 seconds.

3. CHARACTERISTICS OF WARNING DEVICES

          With the engine stationary and commencing at a pressure that may be specified by the manufacturer but does not exceed the cut-in pressure, the warning device shall not operate following two full-stroke actuations of the service brake control.

Annex 5

DISTRIBUTION OF BRAKING AMONG THE AXLES OF VEHICLES

1. GENERAL

          Vehicles which are not equipped with an anti-lock system as defined in annex 6 to this Regulation shall meet all the requirements of this annex. If a special device is used, this must operate automatically.

2. SYMBOLS

 i = axle index (i = 1, front axle; i = 2, rear axle)

 Pi = normal reaction of road surface on axle i under static conditions

 Ni = normal reaction of road surface on axle i under braking

          Ti = force exerted by the brakes on axle i under normal braking conditions on the road

 fi = Ti/Ni , adhesion utilized by axle i [1/]

 J = deceleration of the vehicle

 g = acceleration due to gravity : g = 10m/s2

 z = braking rate of vehicle = J/g

p = mass of vehicle

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

 E = wheelbase

 k = theoretical coefficient of adhesion between tyre and road

3. REQUIREMENTS

         3.1. (A) For all states of the load of the vehicle, the adhesion utilization curve of the front axle shall be situated above that for the rear axle: [2/]

 for all braking rates between 0.15 and 0.8m/s2:

3.1. (B) For k values between 0.2 and 0.8: 2/

    z > 0.1 + 0.7 (k - 0.2) (see diagram 1 of this annex)

         .2. In order to verify the requirements of paragraph 3.1. of this annex, the manufacturer shall provide the adhesion utilization curves for the front and rear axles calculated by the formulae:

 The curves shall be plotted for both the following load conditions:

3.2.l. unladen, in running order with the driver on board;

         3.2.2. laden; where provision, is made for several possibilities of load distribution, the one whereby the front axle is the most heavily laden shall be the one considered ;

         3.2.3. for electric vehicles fitted with an electric regenerative braking system of category B, where the electric regenerative braking capacity is influenced by the electric state of charge, the curves shall be plotted by taking account of the electric braking component under the minimal and maximum conditions of delivered braking force.  This requirement is not applicable if the vehicle is equipped with an anti-lock device which controls the wheels connected to the electric braking then the requirements of