GB/T 19752-2024Hybrid electric vehicles - Power performance - Test method (English PDF)

4.1 Requirements for Test Vehicle

4.1.1 The specifications and filling amounts of lubricating oil and coolant for mechanical moving components shall comply with the vehicle manufacturer's provisions.

4.1.2 Except for the purpose of driving, all energy storage systems shall be charged to the values specified by the vehicle manufacturer (electrical energy, hydraulic pressure and pneumatic pressure, etc.).

4.1.3 Before the test, the test vehicle shall be run-in, and it may also be run-in in accordance with the technical requirements of the vehicle manufacturer. If the vehicle is installed with REESS, the run-in shall be carried out with the REESS installed, and the run-in mileage needs to be greater than 300 km.

4.1.4 The trailer matched to the tractor shall not increase the windward area of the tractor or adopt a trailer recommended by the vehicle manufacturer for the test.

4.2 Environmental Conditions

4.2.1 Air density The air density of the test environment is calculated in accordance with Formula (1). Compared with the air density of the standard environment, its change shall not exceed 7.5%.

4.2.2 Wind speed For Category-M1 vehicles and Category-N1 vehicles with a maximum design total mass less than 2 t, the measurement shall be carried out at

0.7 m above the road surface. For other vehicles, the measurement shall be carried out at

1.6 m above the road surface. The average wind speed shall not exceed 3 m/s, and the maximum wind speed shall not exceed 5 m/s.

4.2.3 Relative humidity The relative humidity shall be less than 95%.

4.4 Road Conditions

4.4.1 Overall requirements The test shall be carried out on dry straight roads, circular roads and test rampways. The road surface shall be solid, smooth, clean and have good adhesion properties.

4.4.2.2 Circular roads

4.4.3 Road conditions for acceleration ability test The measurement zone shall be a flat, dry, clean concrete or asphalt (or similar) straight road. The longitudinal slope of the measurement zone shall not exceed 0.1%, and the transverse slope shall not exceed 3%.

5.1 Charging of REESS

5.1.1 Overall requirements If the hybrid electric vehicles can be externally charged, the REESS shall be charged in accordance with the provisions of

5.1.2 and 5.1.3.If the hybrid electric vehicles cannot be externally charged, in accordance with the illustrative materials provided by the vehicle Test Section

5.1.2 Regular charging Regular charging should adopt the AC charging mode. If the vehicle has a DC charging mode, in accordance with the vehicle manufacturer's recommendations, the DC charging mode may be selected.

5.3.1 Test mass and load distribution requirements for various categories of vehicles

5.3.1.1 Category-M1 vehicles and Category-N1 vehicles with a maximum design total mass less than 2 t

5.3.1.2 Category-M2 vehicles, Category-M3 vehicles, and Category-N vehicles with a maximum design total mass not less than 2 t Except for special provisions, the test mass applicable to Category-M2 and Category-M3 urban buses shall be the curb weight of the complete vehicle plus 65% of the maximum design loading mass. The test mass of semi-trailer tractors and tractor trucks shall be the maximum design total mass in the combination vehicle state specified by the vehicle manufacturer.

5.3.2 Test mass and load distribution requirements for various test items When carrying out the maximum thirty-minutes speed test, maximum speed test and acceleration ability test, the vehicle shall respectively be loaded in accordance with the provisions of

5.3.1 and this clause.

7.1 General Rules

7.1.1 At ambient temperature, tyre pressure shall comply with the vehicle manufacturer's provisions. When carrying out the rampway test, the tyre pressure shall be the tyre inflation pressure specified by the vehicle manufacturer in a cold state plus an additional 20 kPa; the tyre tread depth shall be at least 75% of the original tread depth and the tread shall be in good condition.

7.1.2 The vehicle shall be prepared and preheated in accordance with the provisions of Chapter 5.

7.1.3 In addition to the necessary equipment and daily vehicle control parts for the test, the lighting devices and auxiliary devices (such as. air conditioner, seat heating and multimedia, etc.) on the vehicle shall be turned off during the test. If the vehicle is equipped with hidden lamps, the lamp holder shall be located where the lamps are hidden. If there is a demand for vehicle driving safety during the test, the vehicle lights can be turned on, but this shall be indicated in the record.

7.1.4 Before carrying out the various tests specified in 7.2 ~ 7.5, check the SOC of the vehicle.

7.1.5 The vehicle shall be clean, and if there are no special requirements, the windows and the vents of the passenger compartment or driving cab shall be closed during the test.

7.1.8 When carrying out the tests specified in 7.2 ~

7.6 on vehicles equipped with a transmission, in accordance with the various test requirements, select a gear. If there are no special requirements, then, carry out the tests in accordance with the default setting gear or the gear recommended by the vehicle manufacturer.

7.1.9 Refer to the formats in Appendix B to record the valid data of various tests.

7.2 Maximum Thirty-minutes Speed Test in the Hybrid Mode

7.2.1 The maximum thirty-minutes speed test can be conducted on a circular road or on a chassis

7.2.3 If the vehicle decelerates uncontrollably by the driver during the test, and the vehicle speed does not reach 95% of the estimated maximum thirty-minutes speed, the test can be re- performed in accordance with the above-mentioned estimated maximum thirty-minutes speed. If the vehicle still cannot maintain the speed for 30 minutes, then, the vehicle manufacturer shall re-estimate the maximum thirty-minutes speed, until the vehicle can run at a constant speed for 30 minutes in accordance with the maximum thirty-minutes speed re-estimated by the vehicle manufacturer.

7.2.4 Measure the mileage S1 traveled by the vehicle, and use Formula (2) to calculate the average maximum thirty-minutes speed v30.

7.3.1 Standard test procedures (bi-directional test)

7.3.1.1 Set the measurement length, which shall be at least 200 m.

7.3.2 Test procedures for single direction

7.3.2.1 Due to the characteristics of the test road, the vehicle cannot reach its maximum speed from two directions, so the test can be conducted from only one direction. Its road characteristics shall satisfy the requirements of

4.4.1 and 4.4.2.

7.5 Maximum Gradability Test in the Hybrid Mode

7.5.1 If the vehicle manufacturer has a specially specified hill-climbing gear, the vehicle gear- shifting device shall be placed in the gear specified by the vehicle manufacturer. If there is no specially specified gear, the manual gear shall be placed in the lowest forward gear, the automatic gear shall be placed in gear D, and all-wheel-drive vehicles shall use all-wheel drive.

7.5.2 The test shall be carried out on a rampway with a slope specified by the vehicle manufacturer. If the specified slope is greater than 40%, a safety device shall be installed.

7.5.3 Park the vehicle on a straight-line segment close to the rampway area.

7.6 Hill Starting Ability Test in the Hybrid Mode

7.6.1 The hill starting ability test shall be performed on a rampway with a slope specified by the vehicle manufacturer.

7.6.2 In the middle of the selected rampway, set up a measurement zone of at least 10 m. A starting zone shall be provided in front of the measurement zone. The slopes of the starting zone and the measurement zone shall be the same.