Page 45 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

handlebar-grip, the operating force shall not exceed 180 N, and the braking force
shall not deviate outside the range 60 N to 115 N.

Immediately after having been subjected to the test described in 4.3.5.10.3, the
brakes shall achieve at least 70 % of the braking performance which was recorded at

the highest operating force used during the performance tests 4.3.5.9.5.6 c) 1) and
2).

4.3.5.10.3Test method

Drive the wheel and tyre assembly with the brake applied on a machine such as
those described in 4.3.5.9.5.3 at a velocity of 12,5 km/h ± 5 % with a rearward,
cooling air-velocity of 12,5 km/h ± 10 %, so that a total braking energy of E Wh ± 5 %

specified in Table 2 is developed. The duration of the test shall be 15 min ± 2 min.
Allow the brake to cool to ambient temperature and then repeat the test cycle.

A maximum of 10 interruptions per test cycle is permitted, each with a maximum
duration of 10 s.

When the test has been carried out subject the brakes to the applicable parts of the
tests described in 4.3.5.9.5.6 c) 1) and 2).

Calculate the braking energy from the following formula:
E= F x V x T (Wh)
Br
Br
where

F Br is the braking force（N）；

V Br is the linear velocity of the periphery of the tyre(m/s)（12,5 km/h = 3,472 m/s）；

T is the duration of each test cycle (h) (excluding interruptions)（如 15min = 0.25h）

Table 2 — Total braking energy

Total braking energy, E 75
Wh

When the test has been carried out, the brakes shall be subjected to the applicable
parts of the test described in 4.3.5.9.5, in order to check that the requirement
4.3.5.10.2 is fulfilled.

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