GB 17761-2024Safety technical specification for electric bicycle (English PDF)

6.1.1 Speed limit

6.1.2 Braking performance The braking performance of electric bicycles shall meet the requirements of Table 1 and stop smoothly and safely within the corresponding braking distance.

6.1.3 Bicycle mass The mass of a fully assembled electric bicycle using lead-acid batteries shall be less than or equal to 63 kg; the mass of other types of fully assembled electric bicycles shall be less than or equal to 55 kg.

6.1.4 Pedal riding function

6.1.4.1 Pedal riding requirements Electric bicycles that can use electric power assist function shall have pedal riding devices and meet the following requirements.

6.1.4.2 Pedal riding test method The test is conducted by the following method.

6.1.6 Structure

6.1.6.1 Pedal clearance The pedal clearance of electric bicycles with pedal riding function shall comply with the requirements of

4.13.2 of GB 3565.2-2022 for urban and touring bicycles. Test according to the method specified in

4.13.2 of GB 3565.2-2022.

6.1.6.2 Protrusions Tubes and rigid parts that exist in the form of protrusions and can cause harm to users shall be protected. The size and shape of the end protector of the protrusion are not clearly specified, but a suitable shape shall be given to avoid physical injury. Bolts pose a risk of puncture, so the length of the protrusion that exceeds the inner thread fitting part shall not be greater than the outer diameter of the bolt. Inspect by visual and measurement methods.

6.1.8 Water splashing and wading

6.1.9 Data storage function Electric bicycles used for commercial activities such as urban logistics and commercial leasing shall store the position and driving speed information of the last 20 stops within 1 minute before each second. The driving speed is the speed converted from the electric bicycle motor speed.

6.2.1 Frame/fork assembly

6.2.1.1 Vibration strength Install the frame/fork assembly on a special vibration tester and perform the vibration strength test of the frame/fork assembly, according to the test method for urban and touring electric bicycles described in QB/T 1880. After the test, there shall be no visible cracks, damage, obvious deformation or looseness in any part of the frame/fork assembly.

6.3.2 Control system

6.3.2.1 Brake power-off function When the electric bicycle is electrically driven and braked, its electrical control system shall have the function of powering off the motor. Fully charge the battery pack; connect a DC ammeter in series; install it on the test bicycle. Drive the motor to run; then apply the brake; observe whether the current of the DC ammeter is reduced to less than or equal to the current when there is no torque output on the drive wheel (no-load current); confirm whether the drive motor is powered off within 3 s.

6.3.2.2 Overcurrent protection function The electrical control system of the electric bicycle shall have an overcurrent protection function.

6.3.2.3 Anti-runaway function For electric bicycles with electric drive function, their electrical control system shall have anti-runaway protection function.

6.3.3 Motor

6.3.3.1 Rated continuous output power of the motor The motor (which may be equipped with a reduction device that cannot be separated from the motor in a non-destructive manner) is fixedly installed on the dynamometer test bench, connected to a DC power supply and a standard test controller; the motor load is gradually increased until the motor speed reaches the rated speed. Run in this state, according to

4.2.1 of GB/T 755-2019, so that the motor reaches a thermally stable state.

6.3.3.2 Low-speed running torque of the motor Fix the motor, drive wheel, the entire reduction and transmission system between the two (if any) on the test bench; connect the dynamometer to the drive wheel; connect the DC power supply, the standard test controller, the motor; maintain the rated voltage of the motor; gradually increase the load until the drive wheel drops to the speed corresponding to the bicycle speed of 10 km/h. Electric bicycles with only electric power-assist function are not applicable.

6.4 Fire retardancy

6.4.1 Fire retardancy requirements The fire retardancy properties of non-metallic materials used in electric bicycles meet the following requirements.

6.4.2 Fire retardancy test method The fire retardancy performance of non-metallic materials shall be tested according to the following method.

6.5 Plastic proportion

6.5.1 Plastic proportion requirements The total mass of plastics used in electric bicycles shall not exceed 5.5% of the total bicycle mass.

6.5.2 Test method for plastic proportion Measure the total plastic mass in the fully assembled electric bicycle and calculate the proportion in the total bicycle mass. For composite parts made of plastic and other materials, physical or chemical methods can be used to separate, distinguish or identify them; only the plastic part is calculated.

6.6 Beidou positioning function

6.6.1 Installation of Beidou module Electric bicycles used for business activities such as urban logistics and commercial leasing shall have Beidou modules, which shall be installed in fixed parts of the electric bicycle that are not easily damaged, have anti-disassembly and anti-tampering functions. Use general tools, wire cutting, jumper wires, etc. to verify the anti-disassembly and anti-tampering functions.

6.6.2 Signal reception and processing The Beidou module shall support Beidou independent positioning and at least be able to receive and process Beidou B1C and B2a signals.

6.7 Communication and dynamic safety monitoring

6.7.1 Communication function Electric bicycles shall have 4G or 5G public network communication modules, or other communication modules with similar functions. The communication module shall be installed in a fixed part of the electric bicycle that is not easily damaged; it shall have anti-disassembly and anti-tampering functions.

Note. According to relevant regulations on radio management in China, it may be necessary to approve the radio transmission equipment model of the radio transmission module or the whole bicycle.

6.7.2 Dynamic safety monitoring function Electric bicycles shall have the function of sending the following dynamic safety monitoring information to the information management platform built by enterprises, etc..

6.7.3 Frequency of information transmission When the electric bicycle is in the starting state (the bicycle power switch is closed) or charging state, the time interval between the transmission of information a), b),

6.7.2 shall not exceed 30 s; in other states, the time interval between the transmission of information a), b),

6.7.2 shall not exceed 60 min;

7.2 Enterprise production capacity

7.2.1 Basic requirements The manufacturer shall directly or indirectly have the frame production capacity that meets the quality requirements and matches the production capacity of electric bicycles. The indirect way includes one or more of the following.

7.2.2 Welding Manufacturers shall have gas shielded welding equipment that matches the bicycle production capacity, of which welding robots shall account for more than 70% of all welding equipment, the reset accuracy of welding robots shall be less than

0.1 mm. Check the welding-related project/process design, construction, acceptance documents, equipment specifications and other materials; conduct on-site inspections and verifications to measure the matching of equipment processing capacity with the company's bicycle production capacity.

7.2.3 Electrophoresis process The manufacturer shall have electrophoresis process equipment for main parts such as frames, front forks, rear flat forks, handlebars, etc. that match the production capacity of the whole bicycle. The bearing capacity of the suspension chain track of the electrophoresis process shall not be less than 60 kg, the power of the cathode electrophoresis power supply shall not be less than 200 kW, the volume of the electrophoresis tank shall not be less than 40 m3, the length of the electrophoresis line shall not be less than 300 m.

7.2.4 Workpiece transmission The manufacturer shall have an automated conveyor belt or hanging conveying system for workpieces that matches the production capacity of the whole bicycle. Check the relevant project/process design, construction, acceptance documents, equipment specifications and other materials of the hanging conveying system; conduct on-site inspection and verification, to calculate the matching of the transmission capacity with the enterprise's bicycle production capacity.

7.3 Enterprise testing capability The manufacturer shall have the testing capability to meet the routine inspection and confirmation inspection items in Table 2.

7.4 Enterprise quality control capability The manufacturer shall establish quality assurance capabilities, from key parts procurement, production process control to factory inspection, to ensure that mass- produced products continue to meet the requirements of the standards. It should meet the requirements of Appendix F for enterprise quality control capabilities.

7.5 Inspection rules

7.5.1 Type test Type test shall be carried out in any of the following situations.

7.5.2 Production consistency inspection Production consistency inspection includes routine inspection and confirmation inspection.