Document ID: chunk:federal_register_of_legislation:F2021C00477:body:0:p39
Version: federal_register_of_legislation:F2021C00477
Segment Type: other
Provision Reference: 
Character Range: 103952–106812

to be actuated and the moment when the braking force on the least favourable placed axle reaches the level corresponding to the prescribed performance must not exceed 0.6 seconds;
3.1.2. in the case of vehicles fitted with hydraulic braking systems, the requirements of paragraph 3.1.1. above are considered to be satisfied if, in an emergency manoeuvre, the deceleration of the vehicle or the pressure at the least favourable brake cylinder, reaches a level corresponding to the prescribed performance within 0.6 seconds.

Annex 3

Appendix

Procedure for monitoring the state of battery charge
 This procedure is applicable to vehicle batteries used for traction and regenerative braking.
 The procedure requires the use of a bi-directional DC Watt-hour meter.
 Procedure
1.1. If the batteries are new or have been subject to extended storage, they shall be cycled as recommended by the manufacturer. A minimum 8-hour soak period at ambient temperature shall be allowed after completion of cycling.
1.2. A full charge shall be established using the manufacturer's recommended charging procedure.
1.3. When the braking tests of paragraphs 1.2.11., 1.4.1.2.3., 1.5.1.6., 1.5.1.7. and 1.5.2.4. of Annex 3 are conducted the watt-hours consumed by the traction motors and supplied by the regenerative braking system shall be recorded as a running total which shall then be used to determine the state of charge existing at the beginning or end of a particular test.
1.4. To replicate a level of state of charge in the batteries for comparative tests, such as those of paragraph 1.5.2.4., the batteries shall be either recharged to that level or charged to above that level and discharged into a fixed load at approximately constant power until the required state of charge is reached. Alternatively, for vehicles with battery powered electric traction only, the state of charge may be adjusted by running the vehicle. Tests conducted with a battery partially charged at their start shall be commenced as soon as possible after the desired state of charge has been reached.

Annex 4

Provisions relating to energy sources and energy storage devices (energy accumulators)
Hydraulic braking systems with stored energy
1.  Capacity of energy storage devices (energy accumulators)
1.1. General
1.1.1. Vehicles on which the braking equipment requires the use of stored energy provided by hydraulic fluid under pressure shall be equipped with energy storage devices (energy accumulators) of a capacity meeting the requirements of paragraphs 1.2. or 1.3. of this annex;
1.1.2. However, the energy storage devices shall not be required to be of a prescribed capacity if the braking system is such that in the absence of any energy reserve it is possible with the service brake control to achieve a braking performance at least equal to that prescribed for the secondary