GB/T 12539-2018 in English

《GB/T 12539-2018汽车爬陡坡试验方法》由TC114（全国汽车标准化技术委员会）归口，TC114SC19（全国汽车标准化技术委员会整车分会）执行，主管部门为工业和信息化部。

ChinaStandards.net is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.

This standard is drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 12539-1990 Motor vehicles - Steep hill climbing - Test method.

In addition to a number of editorial changes, the following main technical changes have been made with respect to GB/T 12539-1990:

——Clause 3 "Terms and Definitions" is added;

——"Test conditions" is modified and 4.3 "Vehicle conditions" and 4.4 "Other conditions" are added;

——The test method and calculation equation in Clause 5 are modified;

——Annex A "Record form of steep hill climbing test method" is revised.

This standard was proposed by the Ministry of Industry and Information Technology of the People's Republic of China.

This standard is under the jurisdiction of the National Technical Committee of Auto Standardization (SAC/TC 114).

The previous edition of this standard is as follows:

——GB/T 12539-1990.


Motor vehicles steep hill climbing test method

1 Scope

This standard specifies those requirements for the motor vehicles steep hill climbing test, including the test conditions, test methods, test results, etc.

It is applicable to motor vehicles other than electric vehicles and can be referenced by tractor-trailer combination.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 12534 Motor vehicles - General rules of road test method

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1

climbing success

a state of motor vehicles passing through the test section at an increasing or gradually stable speed during the process of climbing a hill

3.2

maximum gradability

a limit ramp that a motor vehicle can pass under full load on a favorable pavement, which is expressed as a percentage of the vertical height to the horizontal distance of the ramp

4 Test conditions

4.1 Road requirements

As shown in Figure 1, the ramp length of the test section is not less than 20m, and there are transition sections in front and at the back of the test section. The straight and flat section in front of the hill shall not be less than 8m, and shall be a natural ramp (asphalt pavement or concrete pavement) with flat, solid and dry surface and even gradient.

The longitudinal gradient change rate of the test section is not greater than 0.1%, and the transverse change rate is not greater than 3%.



Figure 1 Schematic diagram of hill climbing roads

4.2 Measurement parameters as well as their unit and accuracy

See Table 1 for the measurement parameters as well as their unit and accuracy.

Table 1 Measurement parameters as well as their unit and accuracy
Parameter Unit Accuracy
Time s ±0.1s
Length m ±0.1m
Atmospheric temperature ℃ ±1℃
Atmospheric pressure kPa ±1kPa
Speed km/h ±0.1km/h
Mass (≤3 500kg) kg ±5kg
Mass (>3 500kg) kg ±10kg
Rotating speed r/min ±50r/min
Gradient % ±0.1%

4.3 Vehicle conditions

4.3.1 Tire

The tire pressure is the factory-set inflation pressure of the tire in the cold state plus 20kPa.

4.3.2 Loading mass

The loading mass shall be determined according to the factory-set type, and the load distribution should be uniform and fixed firmly.

4.3.3 Vehicle preparation

4.3.3.1 Vehicles shall be clean, and the ventilation devices in the passenger compartment and the windows shall be closed unless special requirements are required for the test vehicle.

4.3.3.2 Except for the equipment necessary for the test and the daily operating parts of the vehicle, the lighting devices and auxiliary devices on the vehicle shall be turned off.

4.3.3.3 Prior to the test, the vehicle shall be set to normal running temperature in an appropriate manner.

4.4 Other conditions

4.4.1 Atmospheric temperature, pressure, wind speed and other test conditions shall meet the provisions of GB/T 12534.

4.4.2 Safety devices shall be set for the hill with longitudinal gradient larger than 40%.

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test conditions
5 Test methods
6 Test results
Annex A (Normative) Record form of steep hill climbing test