Document ID: chunk:federal_register_of_legislation:F2010C00150:front:0:p24
Version: federal_register_of_legislation:F2010C00150
Segment Type: other
Provision Reference: 
Character Range: 65481–68290

delta t (sec)  n
80% v max  ≤ 120  1/2 v1     45             15

           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
          delta 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 delta 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 3m/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 electric vehicles not having a sufficient autonomy to carry out the cycles of heating, the tests shall be carried out by respecting speed during the first braking application then by using the maximum acceleration of the vehicle, and brake successively at the speed reached at the end of each 45 seconds cycle duration.

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[1/]%, of that prescribed, nor less than 60% of the figure recorded in the Type-0 test with the engine disconnected.

         1.5.2.3. For electric 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. In the case of a vehicle which satisfies the 60% requirement specified in paragraph 1.5.2.2. of this annex, but which cannot comply with the 751/ % requirement of paragraph 1.5.2.2. of this annex, a further hot performance test may be carried out using a control force not exceeding that specified in paragraph 2. of this annex. The results of