GB/T 44677-2024Test methods of energy consumption and range for electric bicycles (English PDF)

1 Scope

GB/T 44677-2024 gives the Chinese test methods for the energy consumption and range of electric bicycles. China has several hundred million electric bicycles and the range figure is the principal thing a buyer compares, yet it is the easiest figure to inflate: quoted at a low constant speed, on a level surface, with a light rider and a new battery, a machine will show a range no owner ever sees. The standard defines the conditions that make the number honest and comparable. It sets the test conditions, the rider or load mass, the tyre pressure, the ambient temperature and the state and conditioning of the battery, the test track or the roller bench and its calibration, the test cycles representing real riding, the procedure for the constant speed and cycle-based tests, the measurement of the energy drawn from the battery and of the distance covered, the end-of-test criterion, and the calculation and expression of the energy consumption and the range. It takes effect on 1 May 2025.

This document describes the test methods of energy consumption and range for electric bicycles. This document applies to the determination of energy consumption and range for electric bicycles that are driven by electricity.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document.

GB 17761-2018, Safety technical specification for electric bicycle QB/T 5886-2023, Electric bicycle - Vocabulary

3 Terms and definitions

For the purpose of this document, the following terms and definitions, as well as those given in GB 17761-2018 and QB/T 5886-2023, apply.

3.1 energy consumption The ratio of the grid energy consumed during the process of recharging an electric bicycle to a fully-charged state after the range test to the range obtained from the test.

4 Test conditions

The test environment shall meet the following conditions.

a) Temperature. 25 °C ± 5 °C;

b) Relative humidity. not greater than 75%;

c) Atmospheric pressure. 86 kPa ~ 106 kPa.

5 Instruments and equipment

5.1 Resolution and accuracy of instruments and equipment The resolution and accuracy of instruments and equipment shall meet the requirements of Table 1.

6 Test vehicle

The test vehicle shall meet the following requirements.

a) Fully assemble the electric bicycle;

b) Use the matching battery and run it through for no less than 3 charge-discharge cycles according to the manufacturer's specified procedure; if the manufacturer has not specified a running-in procedure, run it through at the maximum vehicle speed as described in 7.2 ~ 7.4;

c) Conduct test vehicle debugging according to the product manual and relevant technical documents.

7 Test procedures

7.1 Deviation in test speed and time The permissible deviation for instantaneous speed of the test shall be ±1 km/h, and the permissible deviation for time shall be ±

0.5 s, as shown in Figure 1.