Document ID: chunk:federal_register_of_legislation:F2010C00150:front:0:p37
Version: federal_register_of_legislation:F2010C00150
Segment Type: other
Provision Reference: 
Character Range: 99777–102598

speed of the vehicle expressed in km/h, with an upper limit of 160km/h.

         5.1.2.4. If the time t cannot be completed in a single braking phase, further phases may be used, up to a maximum of four in all.

         5.1.2.5. If the test is conducted in several phases, no fresh energy shall be supplied between the phases of the test.

         From the second phase, the energy consumption corresponding to the initial brake application may be taken into account, by subtracting one full brake application from the four full applications prescribed in paragraph 5.1.1.4. (and 5.1.1.5. and 5.1.2.6.) of this annex for each of the second, third and fourth phases used in the test prescribed in paragraph 5.1.1. of this annex as applicable.

         5.1.2.6. The performance prescribed in paragraph 5.1.1.5. of this annex shall be deemed to be satisfied if, at the end of the fourth application, with the vehicle stationary, the energy level in the storage device(s) is at or above that required for secondary braking with the laden vehicle.

5.2. Utilization of adhesion

         5.2.1. The utilization of adhesion by the anti-lock system takes into account the actual increase in braking distance beyond the theoretical minimum. The anti-lock system shall be deemed to be satisfactory when the condition epsilon > 0.75 is satisfied, where epsilon represents the adhesion utilized, as defined in paragraph 1.2. of appendix 2 to this annex.

         5.2.2. The adhesion utilization epsilon shall be measured on road surfaces with a coefficient of adhesion of 0.3 6/ or less, and of about 0.8 (dry road), with an initial speed of 50km/ h. To eliminate the effects of differential brake temperatures it is recommended that zAL be determined prior to the determination of k.

         5.2.3. The test procedure to determine the coefficient of adhesion (k) and the formulae for calculation of the adhesion utilization (epsilon) shall be those laid down in appendix 2 to this annex.

         5.2.4. The utilization of adhesion by the anti-lock system shall be checked on complete vehicles equipped with anti-lock systems of categories 1 or 2. In the case of vehicles equipped with category 3 anti-lock systems, only the axle(s) with at least one directly controlled wheel must satisfy this requirement.

         5.2.5. The condition epsilon  > 0.75 shall be checked with the vehicle laden and unladen.

          The laden test on the high adhesion surface may be omitted if the prescribed force on the control device does not achieve full cycling of the anti-lock system.

          For the unladen test, the control force may be increased up to 100daN if no cycling is achieved with its full force value[7/]. If 100daN is insufficient to make the system cycle, then this test may be omitted.

5.3. Additional checks