GB/T 12535-2021Test method of starting performance for motor vehicle (English PDF)

5.2 Test site

5.2.1 When the test is carried out outdoors, the road on which the test vehicle is parked shall be level, solid, smooth and dry.

5.2.2 When the test is carried out indoors, the environmental test room shall have facilities such as chassis dynamometer, low-temperature environment chamber, and plateau environment chamber that meet the test requirements.

5.3 Test mass and load distribution

5.3.1 For category M1 vehicles, and category N1 vehicles with a maximum design total mass less than 2000 kg, it shall be in accordance with the following requirements: - When 50% of the maximum allowable laden mass of the vehicle is less than or equal to 180 kg, the test mass is the curb mass of the complete vehicle plus 180 kg (including the mass of measuring personnel and instruments); - When 50% of the maximum allowable laden mass of the vehicle is greater than 180 kg, the test mass of the vehicle is the curb mass of the complete vehicle plus 50% of the maximum allowable laden mass (including the mass of measuring personnel and instruments). The load distribution shall be as uniform as possible.

5.3.2 For category M2 and M3 vehicles, and category N vehicles with a maximum design total mass not less than 2000 kg, it shall be in accordance with the following requirements: - Except for special provisions, 65% of the laden mass is applicable to category M2 and M3 buses; other motor vehicles shall be fully loaded;

6.2.4.1 If the power source for cold starting is engine, carry out the test in accordance with the provisions of 6.2.2.

6.2.4.2 If the power source for cold starting is power battery, carry out the test in accordance with the provisions of 6.2.3.

6.2.5 Cold starting test of fuel cell electric vehicle Start the vehicle in accordance with the vehicle manufacturer's recommended starting procedures. Record the time from when the vehicle is powered on to when the "READY" or "OK" signal device lights up.

6.3 Preheating test

6.3.1 Preheating test of internal combustion engine vehicle After the engine is started, for motor vehicles with manual transmission, the clutch can continue to be disengaged; the gear lever remains in neutral. For motor vehicles with automatic transmission, the transmission remains in P position. Idle in place for 5 min.

6.3.2 Preheating test of pure electric vehicle, extended-range electric vehicle, and fuel cell electric vehicle Pure electric vehicles, extended-range electric vehicles, and fuel cell electric vehicles can directly enter the starting test without preheating test. If preheating is required, the preheating time shall not exceed 5 min.

6.3.3 Preheating test of hybrid electric vehicle except extended-range electric vehicle

6.3.3.1 If the power source for cold starting is engine, carry out the test in accordance with the provisions of 6.3.1.

6.3.3.2 If the power source for cold starting is power battery, carry out the test in accordance with the provisions of 6.3.2.

6.4 Starting test

6.4.1 After starting and preheating tests, put the vehicle in reverse gear and start in reverse; travel no less than 3 m.

6.4.2 After parking, the motor vehicle starts in the lowest forward gear.