GB/T 24157-2017Test methods of range and indication for the state of charge for electric motorcycles and electric mopeds (English PDF)

3.1 Mass of test vehicle

The sum of the complete vehicle kerb mass and the loading mass required for testing. The loading mass is (75 ± 5) kg, including the driver and test equipment. The mass of test vehicle shall include the mass of the power storage battery.

3.4 State of charge

After the power storage battery is discharged, the ratio of the remaining capacity to the rated capacity, which is usually expressed as a percentage.

3.5 Indication for the state of charge

The remaining power is displayed for viewing in the form of pointers, indicator lights, figures and data bars, etc. Please refer to Appendix A for the typical style of indication for the state of charge.

3.6 Warning for the state of charge

When the remaining power is lower than the warning value, a warning will be given with acoustic and optical signals as a prompt to charge as soon as possible.

4.1 Conditions of Test Vehicle

4.1.1 The test vehicle shall be equipped with a device for the indication for the state of charge and a device for the warning for the state of charge, and comply with the stipulations of GB 24155.

4.1.6 Tyre pressure shall comply with the stipulations of the product instruction manual.

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

4.2 Conditions of Test Road

4.2.1 The test road shall be an asphalt or concrete road, and the road surface shall be flat, dry and clean. If it is a circular road, then, the turning radius shall be not less than 50 m.

4.2.2 The test road section shall be kept level, with a longitudinal slope not exceeding 1%. In addition, the height difference between any two points within the entire length is not allowed to exceed 1 m, and the transverse slope is not allowed to exceed 3%.

4.3 Resolution and Accuracy of Test Instrument

The resolution and accuracy of the test instrument are shown in Table 1.

4.4 Conditions of Test Environment

The test environment shall comply with the following stipulations.

4.5 Requirements for Driving

The driver needs to drive the vehicle in accordance with the relevant requirements of GB/T 5378. During the test, the riding posture shall remain as unchanged as possible.

5.1 Test Procedures

The range, energy consumption and indication for the state of charge are simultaneously determined in one test. The test procedures are as follows. […]

5.4 Road Test Load and Chassis Dynamometer Setting

When testing on the road, the load shall comply with the stipulations of 4.1.5.

When testing on the chassis dynamometer, in accordance with the stipulations of Appendix C, set the equivalent inertia of the chassis dynamometer and vehicle road simulated resistance.

5.5 Test Speed and Time Tolerances

The instant speed error and time error of the test shall be within the tolerance range provided in Figure 1. The speed tolerance of each point in the Figure is ± 1 km/h, and the time tolerance is […]

5.6 Test Process

5.6.1 Scope measurement by working condition method

5.6.2 Measurement of range and indication for the state of charge by constant speed method

5.6.2.1 Adopt the test by the constant speed method to simultaneously measure the range and indication for the stage of charge.

5.6.2.5 Test record of range. after the test, record the range Dconstant-speed (expressed in km, rounded off to one decimal place), meanwhile, record the time spent (expressed in min), as well as the average speed, number of stops and stopping time of the vehicle during the test.

5.6.2.6 Test record of indication for the state of charge. during the test, every time the indication for the state of charge drops by one scale or 10%, record the current distance traveled. When the vehicle issues a warning for the state of charge, record the distance traveled Dconstant-speed 1.

5.7 Calculation of Energy Consumption

Adopt the working condition method or constant speed method to respectively measure the range Dworking-condition or Dconstant-speed; in accordance with 5.1 c) or 5.1 e), respectively measure the energy Eworking-condition or Econstant-speed consumed by the power grid. In accordance with Formula (1), calculate the energy consumption C (Cworking-condition or Cconstant-speed), expressed in W·h/km, and retain one decimal place. […]