Document ID: chunk:federal_register_of_legislation:F2021C00477:body:0:p35
Version: federal_register_of_legislation:F2021C00477
Segment Type: other
Provision Reference: 
Character Range: 93934–96671

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 must be allowed in each cycle for stabilizing the speed v1.
1.5.1.3. In these tests, the force applied to the control must 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.) must be continuously engaged.
1.5.1.5. For regaining speed after braking, the gearbox must 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) the hot performance of the service braking system must be measured in the same conditions (and in particular at a mean control force no greater than the mean force actually used) as for the Type-0 test with the engine disconnected (the temperature conditions may be different).
1.5.2.2. This hot performance must not be less than 75[15] per cent of that prescribed, nor less than 60 per cent of the figure recorded in the Type-0 test with the engine disconnected.
1.5.2.3. For vehicles fitted with an electric regenerative braking system of category A, during brake applications, the highest gear must be continuously engaged and the separate electric braking control, if any, not used.
1.5.2.4.