GB/T 42611-2023Test method for sightseeing vehicle brake performance (English PDF)

4.1 General requirements for sightseeing vehicles

4.1.1 The pedal, handle, or electronic parking devices that implement service braking and parking braking shall be convenient for the driver to operate. Sightseeing vehicles shall have a complete service braking system and parking braking system that are sufficient to decelerate, stop, and park the vehicle. The service braking function shall act on all wheels of the sightseeing vehicle. The control device of the service braking and the control device of the parking braking system shall be independent of each other.

4.1.2 The service braking distance and braking stability shall meet the requirements of Table 1, and the brake pedal force shall not be greater than 700 N.

4.1.8 The service braking pedal or handle shall be arranged according to the operating habits of the right foot or right hand.

4.1.9 The service braking system shall not affect the function of the service braking due to corrosion of the brake pipeline by the brake fluid or air resistance caused by the action of the engine and other heat sources.

4.1.10 Garden patrol minibuses shall be equipped with brake lights at the rear of the car; sightseeing combination buses shall be equipped with brake lights in the last carriage. The brake lights are triggered when the driver steps on the brake pedal.

4.1.11 Garden patrol minibuses with a speed limit function, when the specified speed limit is reached, will automatically decelerate the vehicle through the retarder, motor speed limit, or automatic start of the service braking system. The deceleration speed is adjustable and the vehicle speed can be limited to within 110% of the design parameter value.

4.2 Special requirements for sightseeing combination buses

4.2.1 For sightseeing combination buses that use air pressure braking, when the air pressure of the braking system is lower than the starting air pressure, the alarm device shall be able to continuously send an audible or visible alarm signal to the driver.

4.2.2 The braking system of each carriage shall have an independent air reservoir. The capacity of the air reservoir shall ensure that under the condition of rated working pressure and no further inflation, after five consecutive maximum braking travels of the sightseeing combination bus, the pressure in the air reservoir can still remain no lower than the starting air pressure.

4.2.3 The air pressure braking system of sightseeing combination buses shall be equipped with a pressure limiting device to ensure that the air pressure in the air reservoir does not exceed the maximum allowable air pressure. The air pressure braking system shall be equipped with a device to keep the compressed air dry and separate oil and water. After the braking air pressure reaches the rated working pressure, turn off the power of the vehicle and keep it stationary for 2 hours; there shall be no obvious air loss. After starting the sightseeing combination bus, press the brake pedal for five consecutive times full travel; during this period, the braking system shall not alarm, and the brake charging pump shall not start.

4.2.4 When the carriage is suddenly decoupled and separated while the sightseeing combination bus is running, causing the braking pipe or braking signal line to break, the carriage braking system shall brake immediately and enable the decoupled carriage to brake and stop within 8m. The braking process shall not cause harm to passengers. After the carriage stops, the parking state shall be easily released. If special tools are needed, they shall be equipped with the vehicle.

4.2.5 When the sightseeing combination bus is braked, the danger caused by the collision of carriages and the discomfort to passengers shall be avoided.

5.1 Preparation before the test

5.1.1 All assemblies, components, accessories, and ancillary devices of the prototype are fully equipped and fully running as required, so that they are in normal technical condition. The battery voltage is sufficient, the oil and fluids meet the ex-factory conditions, all mechanical transmissions are well lubricated, the braking system functions normally, and the tire pressure meets the specifications in the manual.

5.1.2 The environmental conditions during the test shall meet the following requirements:

a) Temperature is at -5 °C~40 °C;

b) The wind speed does not exceed 3 m/s;

c) The relative humidity of the air is not greater than 90%;

d) The altitude is less than 2000 m.

5.1.3 The test site shall be a dry, flat concrete or asphalt pavement, and the length and width shall meet the test requirements.

5.1.4 The instruments, equipment, and measuring tools used in the test shall be verified or calibrated and used within the validity period.

5.1.5 The unloaded and fully loaded state of the sightseeing vehicle during the test shall meet the requirements of GB/T 21268 and GB/T 38433.

5.2 Visual inspection Check whether the braking system of the sightseeing vehicle complies with the provisions of 4.1.1, 4.1.3, 4.1.6, 4.1.8, 4.1.9, 4.1.10, 4.2.1, and

4.2.3 through visual inspection and functional verification.

5.5 Parking braking test on ramps The sightseeing vehicle is fully loaded and parked on the ramp specified in 4.1.5. The transmission is in neutral (if any), the engine is turned off or the running motor is turned off, and the parking braking control device is operated to park the vehicle on the ramp. Measure the braking force and the sliding distance of the vehicle within 10 minutes. Carry out the upslope and downslope tests once each to check whether the test results comply with the provisions of 4.1.5.

5.6 Braking heat fade test for garden patrol minibuses When the ambient temperature is no less than 15°C and the garden patrol minibus is fully loaded, after pressing the accelerator pedal to bring the vehicle to the maximum speed, keep the accelerator pedal at the maximum stroke, and then slowly press the brake pedal to bring the vehicle speed to 40%~50% of its maximum speed, continue operating for 2 km, causing the braking device to heat up. Then perform the braking distance test again according to the provisions of 5.3. Check whether the test results comply with the provisions of 4.1.7. NOTE: This item is not applicable to vehicles with active retarding protection functions.

5.7 Braking heat fade test for sightseeing combination buses When the sightseeing combination bus is fully loaded, after five consecutive emergency braking tests according to the test method specified in 5.3, immediately measure the braking distance for one round travel, record the braking distance, and take the average value. Check whether the test results comply with the provisions of 4.1.7.