China: Updates to the GB standard for vehicle braking systems

 

China has published an updated National Standard of the P.R.C., Technical requirements and testing methods for passenger car braking systems (GB 21670—XXXX).

The document specifies the safety requirements and test methods for passenger car braking systems.  It applies to vehicles of category M1.

For products newly applied for type approval, it will be implemented from the implementation date of this document. For products that have obtained the type approval, the implementation will start from the 25th month from the implementation date of this document.

The new standard regulates issues such as: Structural and functional requirements, brake systems, brake system characteristics, test and performance requirements, test requirements, performance requirements of brake systems, response times, energy storage hydraulic brake systems – regarding energy sources and energy storage devices (accumulators ) regulations, vehicle anti-lock braking system test requirements, vehicle model changes and extensions.

The standard also contains references to the following other GB standards:

• GB 4094 Marking of vehicle controls, indicators and signaling devices
• GB/T 5345 Marking of petroleum-based or non-petroleum-based brake fluid containers for road vehicles
• GB/T 5620 Road vehicle and trailer brake terms and their definitions
• GB 12981 Motorized Vehicle brake fluid
• GB/T 15089 Motor vehicle and trailer classification
• GB/T 34590.1～GB/T 34590.12—2022 Road vehicle functional safety
• GB 34660 Road vehicle electromagnetic compatibility requirements and test methods

The new standard replaces GB 21670-2008 “Technical Requirements and Test Methods for Passenger Car Braking Systems”. Compared with GB 21670-2008, the main technical changes in this document are as follows:

a) Normative reference document GB/T 5345 replaces GB/T 14168, GB 34660 replaces GB/T 17619 and GB 18655, and adds GB/T 34590-2022 (all parts) (see Chapter 2, Chapter 2 of the 2008 version);

b) Deleted the car model, opening pressure, and closing pressure , safety concepts, terms and definitions of composite electronic vehicle control systems, upper-level control, and control scope (see Chapter 3, Chapter 3 of the 2008 edition);

c) Changes in braking equipment, transmission devices, brakes, different types of brakes Dynamic system, braking system components, progressive braking/adjustable braking, wheel/axle load, maximum static wheel/axle load, energy storage hydraulic braking system, power battery, state of charge, phase braking, Terms and definitions for automatically controlled braking, selective braking, nominal value, anti-lock braking system, sensor, controller, regulator, direct wheel control, indirect wheel control, full cycle, electronic control system, unit, transmission chain (See Chapter 3, Chapter 3 of the 2008 edition);

d) Added terms and definitions for braking systems, braking signals, and emergency braking signals (see 3.2, 3.23, and 3.24);

e) Changed symbols and abbreviations abbreviation (see Chapter 4, Appendix A of the 2008 edition);

f) Changed the design, manufacturing and installation requirements of the vehicle braking system, and the expression of failure detection signals (see 5.1.1.1, 5.1.1.5, 4.1 of the 2008 edition). 1.1, 4.1.1.6);

g) Changed the requirements related to electromagnetic compatibility (see 5.1.1.4, 6.5.1.5, 4.1.1.4, 5.6.2.5 of the 2008 version);

h) Changed the description of the function of the braking system (see 5.1.2, 4.1.2 of the 2008 edition);

i) changed the functional safety requirements of the brake electronic control system (see 5.1.3, Appendix B, 4.1.3, Appendix D of the 2008 edition);

j) changed the driving Statement of requirements for common components of braking, emergency braking and parking brake systems (see 5.2.2, 4.2.2 of the 2008 edition);

k) Changed the requirements for parking release [see 5.2.10, 5.2.19 d), 2008 version 4.2.10, 4.2.19.4];

l) Changed the inspection requirements for the wear of service brake friction parts (see 5.2.11, 2008 version 4.2.11.2);

m) Added Type A and both For vehicles with Type A and Type B electric regenerative braking systems, the braking effect achieved by releasing the accelerator pedal cannot decelerate the vehicle to a stop [see 5.2.18 f)];

n) Changes to the parking brake using electronic transmission Requirements for an electrical failure in the vehicle braking system [see 5.2.19 b), 2008 version 4.2.19.2];

… and many others.

To find out more about the full scope of the changes and Chinese vehicle regulations in general, please do not hesitate to contact the Institute for Global Automotive Regulatory Research Directly.