Common use of Type-I test Clause in Contracts

Type-I test. (fade test) 1.5.1. With repeated braking 1.5.1.1. The service braking systems of all power-driven 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: Category of vehicles Conditions v1 [km/h] v2 [km/h] ∆t [sec] n where: v1 = initial speed, at beginning of braking v2 = speed at end of braking vmax = maximum speed of 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 the mean fully developed deceleration of 3 m/s2 at the first brake application; this force shall remain constant throughout the succeeding brake applications. 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 time cycle duration as specified, for the appropriate vehicle category, in paragraph 1.5.1.1. above. 1.5.1.7. In the case of vehicles equipped with automatic brake adjustment devices the adjustment of the brakes shall, prior to the Type-I test above, be set according to the following procedures as appropriate: 1.5.1.7.1. In the case of vehicles equipped with air operated brakes the adjustment of the brakes shall be such as to enable the automatic brake adjustment device to function. For this purpose the actuator stroke shall be adjusted to: so > 1.1 x sre-adjust (the upper limit shall not exceed a value recommended by the manufacturer) where: sre-adjust is the re-adjustment stroke according to the specification of the manufacturer of the automatic brake adjustment device, i.e. the stroke, where it starts to readjust the running clearance of the brake with an actuator pressure of 15 per cent of the brake system operating pressure but not less than 100 kPa. Where, by agreement with the Technical Service, it is impractical to measure the actuator stroke, the initial setting shall be agreed with the Technical Service. From the above condition the brake shall be operated with an actuator pressure of 30 per cent of the brake system operating pressure but not less than 200 kPa 50 times in succession. This shall be followed by a single brake application with an actuator pressure of > 650 kPa. 1.5.1.7.2. In the case of vehicles equipped with hydraulically operated disc brakes no setting requirements are deemed necessary. 1.5.1.7.3. In the case of vehicles equipped with hydraulically operated drum brakes the adjustment of the brakes shall be as specified by the manufacturer. 1.5.1.8. 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 listed in the fourth clause of paragraph 1.4.1.2.2. above. 1.5.2. With continuous braking 1.5.2.1. The service brakes of trailers of categories O2 and O3 shall be tested in such a manner that, the vehicle being laden, the energy input to the brakes is equivalent to that recorded in the same period of time with a laden vehicle driven at a steady speed of 40 km/h on a 7 per cent down-gradient for a distance of 1.7 km. 1.5.2.2. The test may be carried out on a level road, the trailer being drawn by a towing vehicle; during the test, the force applied to the control shall be adjusted so as to keep the resistance of the trailer constant (7 per cent of the maximum total stationary axle load of the trailer). If the power available for hauling is insufficient, the test can be conducted at a lower speed but over a greater distance as shown in the table below: 1.5.2.3. In the case of trailers equipped with automatic brake adjustment devices the adjustment of the brakes shall, prior to the Type-I test prescribed above, be set according to the procedure as laid down in paragraph 1.7.1.1. of this annex.