JT/T 1178.2-2019Safety specification for commercial vehicle for cargos transportation - Part 2: Towing vehicle and trailer (English PDF)

4.4 Towing trucks and vehicle combinations (meeting the enterprise's product

design AND not exceeding the maximum external dimensions specified in GB

1589, except for tank vehicles), shall be subject to the snaking test, under full load, in accordance with the provisions of Chapter 5 of GB/T 6323-2014. For the peak average yaw velocity of towing trucks (single-vehicle status) and towing vehicles (vehicle combination state), it shall be less than the lower limit of QC/T 480's corresponding stake spacing and reference vehicle speed.

4.5 Towing trucks and vehicle combinations (meeting the enterprise’s product

design AND not exceeding the maximum external dimensions specified in GB

1589, except for tank vehicles) shall be subjected to the rollover stability test, under full load, in accordance with the test method specified in JT/T 884. When the centripetal acceleration, at the center of mass of the towing truck (single vehicle state) and the towing vehicle (vehicle combination state) reaches 0.4 g, neither the towing vehicle nor the trailer will rollover or slip.

4.6 When towing vehicles and trailers travel 500 m, in a straight line at a speed of 30 km/h, on a flat and dry pavement, under no-load conditions (meeting the enterprise’s product design AND not exceeding the maximum outline size specified in GB 1589), in the vehicle combination state, THEN, for the maximum swing amplitude of the center of the rear axle of the trailer, as relative to the center of the front axle of the towing vehicle, it shall be less than or equal to 100 mm for the articulated vehicle and center-axle trailer combination, OR less than or equal to 150 mm for the draw bar trailer combination.

4.7 For the towing vehicles and trailers (meeting the design of the enterprise's

product AND not exceeding the maximum external dimensions specified in GB

5.7 When the towing vehicle adopts pneumatic braking, the rated working air

pressure of the air cylinder of the braking system shall be greater than or equal to 1000 kPa. The air cylinders of the towing vehicle and the trailer shall meet the requirements of QC/T 200. The rated working air pressure value of the air cylinder of the brake system shall be clearly marked on the product label (or other permanently maintained marks set on the easily visible part of the vehicle).

5.8 When the towing vehicle, which adopts pneumatic braking, is tested in accordance with the method specified in GB 12676, THEN, the response time (A), from stepping on the brake pedal to the most unfavorable brake chamber, shall be less than or equal to 0.6 s. Meanwhile, the response time (B), from stepping on the brake pedal of the towing vehicle, to the end of the hose extension of the air pressure control pipeline joint, between the towing vehicle and the trailer, shall be less than or equal to 0.4 s. For the trailer, which adopts

6.9 The installation position and strength of gas cylinders, for gas-fueled towing

vehicles shall meet the requirements of GB 19239. For the towing vehicles, which use liquefied natural gas as fuel, the installation position and strength of gas cylinders shall meet the requirements of 4.3.2 in GB/T 36883-2018.

6.10 The safety protection of the fuel system of towing vehicles shall meet the requirements of GB 7258.

the requirements of GB/T 5053.1, it shall adjust the wiring method of the standard electrical connector. Line No.2 shall be connected to position light, outline light, license plate light. Line No.6 shall be connected to the rear fog lamp. Line No.7 shall be connected to the reversing lamp. The other wiring methods comply with the provisions of 5.4 in GB/T 5053.1-

2006.

9.1 For towing trucks and trailers (except tank vehicles, vehicle transport

vehicles, dump trucks), they shall be provided with permanently maintained load layout identifications, on the easily visible parts of the vehicles. The size of the identification shall not be less than 160 mm x 100 mm. For the towing trucks, the drawing of the identification shall consider the load transfer of the draw bar connector. The drawing principle shall comply with the provisions of 7.2 of JT/T

1178.1-2018. Please refer to Appendix D for the drawing method.

9.2 For the towing trucks (except vehicle transport vehicles), the number, installation position, strength of the cargo box's securing points shall comply with the provisions of 7.3 of JT/T 1178.1-2018. For the trailers (except for tank trailers, container transport semi-trailers, vehicle transport trailers, auto-dump trailers), the number, installation location, strength of the securing points shall comply with the requirements of Appendix C of JT/T 882-2014.

9.3 The vehicle transport vehicle shall be accompanied with technical data on the layout, loading, fastening of the transport vehicle. The loading of the transport vehicle AND the type selection of the fixing device shall meet the requirements of GB/T 31083.

10.3 At an eye-catching position on the rear part of the center-axle trailer

combination and the draw bar trailer combination, it shall install at least one rectangular sign plate, on which there are words "long vehicle". The sign plate shall have a length of 500 mm ± 10 mm AND a width of . The

Appendix B (Normative)

Technical requirements and test methods for tire pressure monitoring system

B.1 Technical requirements

B.1.1 Signal device

B.1.1.1 For vehicles, which are equipped with TPMS, they shall be equipped with signal devices, which have tire under-pressure alarm, tire overpressure alarm, tire high temperature alarm. In case of under-pressure of tire (less than or equal to 75% of the recommended tire pressure Prec), overpressure of tire (greater than or equal to 130% of the recommended tire pressure Prec), high temperature of tire (greater than or equal to 90 °C), the TPMS system shall send an optical warning signal to the driver, through a signal device, AND indicate the specific position of the tire. It may be accompanied by additional text description OR use the acoustic method to assist alarming.

B.1.1.2 The signal device shall also have a fault alarm function. When the

TPMS fails, it shall send an optical alarm signal to the driver, through the signal device. It may be accompanied by additional text description OR use the acoustic method to assist alarming.

B.1.1.3 If tire under-pressure, tire overpressure, tire high temperature alarms, fault alarms share a signal device, the expression methods of tire under- pressure, tire high pressure, tire high temperature alarms, fault alarms shall be clearly distinguished. Meanwhile, it shall be clearly stated in the vehicle's user manual.

B.1.1.4 The signal device shall meet the following requirements:

a) It has the alarm indicator icon, which is as shown in Figure B.1.

b) It has a close-to-real vehicle outline, which is as shown in Figure B.2, indicating the position of the warning tire, displaying the tire pressure and tire temperature.

c) The sign of the signal device is located in an easy-to-observe position, in front of the driver, to facilitate the driver to observe the signal device’s state.

d) The color of the signal device sign is yellow, when it is lit; this color requirement does not apply to signal devices, which are located in a b) When the vehicle is stationary, make the vehicle's ignition switch in the

"OFF" ("LOCK") state. Adjust the air pressure of any one or more tires of the vehicle to (75% x Prec - 35) kPa. Record the time, from when the vehicle's ignition switch turns to the "ON" ("RUN") state to when the under- pressure alarm device lights up.

c) Start the vehicle AND test separately at the vehicle speed, which is specified in B.2.1.3: After driving for 20 minutes, adjust the pressure of any tire and multiple tires of the vehicle (when the vehicle is stopped, the pressure adjustment time of a single test tire shall be less than or equal to

30 s). Record the time, from when tire pressure reaches (75% x Prec - 35) kPa to the time when the TPMS alarm signal device lights up.

d) After b) and c) test, turn the ignition switch to "OFF" ("LOCK") state. After

5 minutes, turn the ignition switch to "ON" ("RUN") state. Observe the state of the signal device. After the vehicle is stationary for 1 hour, inflate all tires to Prec. Observe the state of the signal device.

B.2.4 Overpressure alarm test of tire

Carry out overpressure alarm test on single and multiple tire, according to the following steps:

a) After the vehicle is stationary for at least 1 hour, inflate all tires to Prec.

b) When the vehicle is stationary, turn the ignition switch of the vehicle into the "OFF" ("LOCK") state. Adjust the pressure of any one or more tires of the vehicle to (130% x Prec + 35) kPa. Record the time, from when the vehicle's ignition switch is turned to "ON" ("RUN") state to when the overvoltage alarm device lights up.

c) Start the vehicle AND test separately at the vehicle speed, which is specified in B.2.1.3: After driving for 20 minutes, adjust the pressure of any tire and multiple tires of the vehicle (when the vehicle is stopped, the time for adjusting the pressure of a single test tire shall be less than or equal to 30 s). Record the time, from when the tire pressure reaches (130% x Prec + 35) kPa to when the TPMS alarm signal device lights up.

d) After the test in b) and c), if the TPMS alarm signal device lights up within

10 s AND the position of the overpressure tire is indicated correctly, turn the ignition switch to the "OFF" ("LOCK") state. After 5 minutes, turn the ignition switch to the "ON" ("RUN") state. Observe the state of the signal device. After the vehicle is stationary for 1 hour, deflate all tires to Prec.

Observe the status of the signal device.

B.2.5 High temperature alarm test of tire

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