GB 38185-2026Performance requirements and test methods for electronic stability control (ESC) systems for heavy-duty vehicles (English PDF)

Foreword

This document is drafted in accordance with the rules given in GB/T 1.1-2020, Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.

This document converts GB/T 38185-2019, Performance requirements and testing methods for electronic stability control system (ESC) for commercial vehicles, into a mandatory national standard. Compared with GB/T 38185-2019, apart from structural adjustments and editorial changes, the main technical changes are as follows:

a) the scope of application has been changed (see Clause 1; Clause 1 of the 2019 edition);

b) the performance requirement for roll stability control in the J-turn test has been changed (see 5.1.2; 5.1.2 of the 2019 edition);

c) functional safety requirements for the electronic stability control systems of heavy-duty vehicles have been added (see 5.5);

d) the additional test requirements have been deleted (see 7.10 of the 2019 edition);

e) requirements for the determination of the same type have been added (see Clause 8);

f) requirements for the implementation of the standard have been added (see Clause 9);

g) functional safety requirements have been added (see Annex A);

h) functional safety description requirements have been added (see Annex B).

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority shall not be held responsible for identifying any or all such patent rights.

This document was proposed by and is under the jurisdiction of the Ministry of Industry and Information Technology of the People's Republic of China.

This document and the document it replaces were issued as follows: first issued in 2019 as GB/T 38185-2019; this is the first revision, with the standard number changed to GB 38185-2026.

1 Scope

This document specifies the general requirements, performance requirements and test conditions for the electronic stability control systems of heavy-duty vehicles, and describes the corresponding test methods.

This document applies to the electronic stability control systems of vehicles of categories M2, M3, N2 and N3 as specified in GB/T 15089.

This document does not apply to special operation vehicles as defined in GB/T 17350.

2 Normative references

The contents of the following documents constitute indispensable provisions of this document through normative references in the text. For dated references, only the edition corresponding to that date applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 12428, Calculation method of passenger car loading mass

GB/T 12549, Terms and definitions of motor vehicle handling and stability

GB 12676, Technical requirements and testing methods for commercial vehicle and trailer braking systems

GB/T 13594-2025, Performance requirements and test methods for anti-lock braking systems of commercial vehicles and trailers

GB/T 15089, Classification of power-driven vehicles and trailers

GB/T 17350, Classification, designation and model code of special purpose motor vehicles and trailers

GB/T 26987-2011, Road vehicles - Measurement of road surface friction

GB 30677, Performance requirements and test methods for electronic stability control systems of light vehicles

GB/T 34590 (all parts), Road vehicles - Functional safety

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB/T 12549 and GB 30677 and the following apply.

3.1 ESC braking: the process in which the ESC commands braking of any wheel, with the brake pressure maintained for at least 0.5 s and reaching at least 34 kPa (for air braking systems) or 172 kPa (for hydraulic braking systems).

4 General requirements

The electronic stability control system (ESC) of a heavy-duty vehicle shall have the following functions:

a) it can apply braking torque to all wheels individually according to a given control logic (wheels controlled indirectly within the same group are regarded as the same wheel as the directly controlled wheel);

b) it works in all phases of driving, including acceleration, coasting and deceleration (including braking), except in the following cases: 1) the driver has switched off the ESC; 2) the vehicle speed is below 20 km/h; 3) the system self-check has been completed and the vehicle has been in the driving state specified in 7.8.2 for not more than 2 min; 4) the vehicle is in reverse;

c) its normal operation shall not be affected even while the anti-lock braking system (ABS) or the anti-slip regulation (ASR) is acting.