GB/T 18386.2-2022Test methods for energy consumption and range of electric vehicles - Part 2: Heavy-duty commercial vehicles (English PDF)

4.1 Environmental conditions

4.1.1 The recommended ambient temperature is (23±5) °C. The ambient temperature range can be extended to 5°C~35°C upon suggestion by the automobile manufacturer and confirmed by the inspection agency.

4.2 Measurement parameters, units and accuracy

4.2.1 The test equipment used for the test shall meet the relevant requirements of CD.1, CD.2 and CD.5 in GB 18352.6-2016.

4.3.2 Vehicle conditions

4.3.2.1 The test vehicle shall be loaded according to the technical requirements of each test.

4.3.2.5 The test driver shall make the rechargeable energy storage system (REESS) work at the normal operating temperature according to the operating procedures recommended by the vehicle manufacturer.

4.3.2.6 Before the test, the test vehicle shall drive at least 300km with the REESS installed on the test vehicle.

4.3.3 Setting of road load The measurement of running resistance and the simulation on the chassis dynamometer shall be in accordance with the provisions in GB/T 27840.When carrying out the sliding test on the road and chassis dynamometer, the function of the braking energy recovery system shall be shielded. During the sliding test on the road and chassis dynamometer, other parts of the car should be in the same state (such as air conditioning off, etc.).

4.4 Test cycle

4.4.1 The test vehicle shall measure the energy consumption and range of the vehicle in accordance with the China Heavy-Duty Commercial Vehicle Test Cycle (CHTC) stipulated in Appendix A of GB/T 38146.2-2019.

4.4.2 If the maximum vehicle speed of the vehicle is less than the maximum vehicle speed of CHTC, when the target vehicle speed is greater than the maximum vehicle speed, the test cycle shall be corrected according to the provisions of CA.5 in GB 18352.6-2016.

5.2 Tolerance

5.2.1 If the maximum vehicle speed of the vehicle is no less than the maximum vehicle speed of CHTC, the test shall be carried out according to the test cycle specified in 4.4.1.The speed tolerance and time tolerance of the test cycle shall meet the requirements of the tolerance and reference curve given in Figure

1.Each point in Figure 1 gives a speed tolerance of ±3km/h and a time tolerance of ±1s. In each test cycle, the cumulative time allowed to exceed the tolerance range does not exceed 15s. The total time out of tolerance shall be noted in the test report.

5.3 Conditions for terminating the test

5.3.1 When carrying out the test specified in 5.5, the test shall be stopped when the following situations occur.

5.3.2 When the condition for ending the test is reached, keep the gear position unchanged, let the vehicle slide to 5km/h, and then depress the braking pedal to stop.

5.4 Initial charging of REESS

5.4.1 General Unless the automobile manufacturer or REESS manufacturer has other provisions, the initial charging of REESS can be carried out in accordance with the provisions in

5.4.2 and 5.4.3. The initial charging of the REESS refers to the first-time charging of the REESS after receiving the vehicle. If the specified several tests or measurements are carried out consecutively, the first-time charging may be considered as the initial charging.

5.4.3 Charging of REESS

5.4.3.1 Conventional charging Conductive charging shall be used to charge REESS. If the vehicle has both DC and AC charging methods, it shall be selected according to the suggestion of the automobile manufacturer. REESS recommends charging in one of the following ways at the ambient temperature specified in 4.1.

5.5 Test on range

5.5.1 Test options The moment is recorded at the end of the REESS charging. Within 12 hours thereafter, start the test according to the prescribed test procedure. During this period, ensure that the vehicle is placed at the ambient temperature specified in 4.1.

5.5.3 Shortening method

5.5.3.1 Speed segments The speed segment of the shortening method is composed of 2 test cycle segments and 2 constant speed segments, as shown in Figure 2 for a schematic diagram. Among them, DS1 and DS2 are test cycle sections, each containing 2 test cycles specified in 4.4; CSSM and CSSE are constant speed sections, composed of relatively high constant vehicle speed, to discharge as soon as possible and reduce test time. Through two test cycle sections, calculate the energy consumption and range of the vehicle respectively according to the provisions of

6.2 and 6.3.2. Figure 2 - Schematic Diagram of Speed Segment Compositions by Shortening Method

5.6 Measurement of REESS charging and energy

5.6.1 After the end of the test, the vehicle shall be charged within 120 min according to the provisions of 5.4.3.1.When the requirements of

5.4.3.2 are met, the REESS charging ends. Verification agency confirmed as per suggestion of the vehicle manufacturer Max. total soaking time Range in constant speed segment CSSM

5.6.2 A power measurement device shall be installed between the vehicle REESS and the power supply equipment to measure the power (EAC) charged from the external power source and the charging time.

6.1 General

6.1.1 Relevant formulas for calculating energy consumption and range In order to calculate the energy consumption and range of the vehicle, Formulas (2) to (4) are essential.

6.1.2 Special requirements for test results For vehicles whose maximum speed is less than the maximum speed of the test cycle, when the test is carried out, the energy consumption and range results shall be recorded in the test report and the maximum speed shall be explained.

6.2 Energy consumption Energy consumption is calculated according to Formula (5).

6.3 Range

6.3.1 Scope based on conventional working conditions The range based on the conventional working condition method specified in

5.5.2 is calculated according to Formula (6).

7.1 General requirements

7.1.1 The automobile manufacturer shall select the test driving mode according to 7.2.This mode shall enable the vehicle to follow the test cycle specified in

4.4 within the speed tolerance range specified in 5.2.

7.1.2 Automobile manufacturers shall provide proof of the following circumstances to the competent authority.

7.2 Selection of driving mode

7.2.1 If there is a main mode, and this mode can make the vehicle follow the test cycle specified in

4.4.1 during the test, then select this mode.

7.2.3 If there is no mode that can make the vehicle follow the test cycle specified in

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