Document ID: chunk:federal_register_of_legislation:F2021C01192:body:0:p31
Version: federal_register_of_legislation:F2021C01192
Segment Type: other
Provision Reference: 
Character Range: 84009–86837

maximum practical performance figures shall be measured, and the behaviour of the vehicle shall be in accordance with paragraph 1.3.2. of this annex. However, if the maximum speed of the vehicle is greater than 200 km/h, the test speed shall be 160 km/h.
1.5.  Type-I test (fade and recovery test)
1.5.1.  Heating procedure
1.5.1.1. The service brakes of all vehicles shall be tested by successively applying and releasing the brakes a number of times, the vehicle being laden, in the conditions shown in the table below:
Conditions
v1          v2      t     n
(km/h)      (km/h)  (sec)
80% vmax    0.5 v1  45     15
 120

 Where:
                    v1 = initial speed, at beginning of braking
                    v2 = speed at end of braking
                    vmax = maximum speed of the vehicle
                    n = number of brake applications
                    t = duration of a braking cycle:  time elapsing between the initiation of one brake application and the initiation of the next.
1.5.1.2. If the characteristics of the vehicle make it impossible to abide by the duration prescribed for t, the duration may be increased; in any event, in addition to the time necessary for braking and accelerating the vehicle, a period of 10 seconds shall be allowed in each cycle for stabilizing the speed v1.
1.5.1.3. In these tests, the force applied to the control shall be so adjusted as to attain a mean deceleration of 3 m/s2 during every brake application; two preliminary tests may be carried out to determine the appropriate control force.
1.5.1.4. During brake applications, the highest gear ratio (excluding overdrive, etc.) shall be continuously engaged.
1.5.1.5. For regaining speed after braking, the gearbox shall be used in such a way as to attain the speed v1 in the shortest possible time (maximum acceleration allowed by the engine and gearbox).
1.5.1.6. For vehicles not having sufficient autonomy to carry out the cycles of heating of the brakes, the tests shall be carried out by achieving the prescribed speed before the first braking application and thereafter by using the maximum acceleration available to regain speed and then braking successively at the speed reached at the end of each 45 second cycle duration.

1.5.1.7. For vehicles equipped with an electric regenerative braking system of category B, the condition of the vehicle batteries at the start of the test, shall be such that the braking force contribution provided by the electric regenerative braking system does not exceed the minimum guaranteed by the system design. This requirement is deemed to be satisfied if the batteries are at one of the state of charge conditions as listed in paragraph 1.4.1.2.3. above.
1.5.2.   Hot performance
1.5.2.1. At the end of the Type-I test (described in paragraph 1.5.1. of this annex)