GB/T 44287-2024 English PDF (GBT44287-2024)

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GB/T 44287-2024: Performance requirement and testing methods for electronic braking system(EBS) of commercial vehicles
GB/T 44287-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.40
CCS T 24
GB/T 44287-2024
Performance requirement and testing methods for electronic
braking system (EBS) of commercial vehicles
ISSUED ON: AUGUST 23, 2024
IMPLEMENTED ON: MARCH 01, 2025
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 General requirements ... 5
5 Performance requirements ... 7
6 Test conditions ... 7
7 Test methods ... 8
Performance requirement and testing methods for electronic
braking system (EBS) of commercial vehicles
1 Scope
This document specifies the general requirements, performance requirements, test
conditions and test methods for electronic braking system of commercial vehicles.
This document applies to category M2, M3, N2 and N3 vehicles that are equipped with
electronic braking system and comply with the provisions of GB/T 15089.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 5620 Road vehicles - Vocabulary and definition for braking of automotive
vehicles and their trailers
GB 12676-2014 Technical requirements and testing methods for commercial vehicle
and trailer braking systems
GB/T 13594-2003 Antilock braking performance and test procedure for motor
vehicles and their trailers
GB/T 15089 Classification of power-driven vehicles and trailers
ISO 11992-2:2023 Road vehicles - Interchange of digital information on electrical
connections between towing and towed vehicles - Part 2: Application layer for
brakes and running gear
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T 5620 and
GB 12676-2014 and the following apply.
3.1
electronic braking system; EBS
A pneumatic braking system that generates and transmits control signals in the form of
electrical signals and controls the generation of braking force by outputting electrical
signals.
3.2
electronic control function
A function of the electronic control unit (ECU) receiving the electronic control signal
output by the driver through the brake pedal to operate the electronic control brake
master valve or the external braking request issued by other modules through the bus,
and then sending an electronic control command to brake the vehicle.
NOTE 1: The electronic control brake master valve refers to a device that converts the brake pedal
position into an electronic control signal and an air pressure control signal.
NOTE 2: The electronic control unit refers to a component used to process the information provided
by the sensor and issue control commands.
3.3
deceleration control
A function of determining the braking deceleration of the vehicle according to the brake
pedal position.
3.4
brake assist; BA
The function of the electronic braking system automatically providing a greater braking
effect than that corresponding to the pedal position or trigger the full cycle of the anti-
lock braking system according to the driver’s emergency braking needs.
4 General requirements
4.1 Vehicles equipped with an electronic braking system shall have at least electronic
control functions such as service braking, anti-lock braking, deceleration control and
brake assist. When the electronic control function fails, the service braking system shall
have a backup brake control function, which can achieve emergency braking by
controlling and providing braking force through air pressure.
4.2 The electronic braking system shall have a self-checking function.
4.3 The vehicle shall be equipped with an EBS fault signal device complying with the
requirements of 4.4, which shall be able to alarm the driver when any fault occurs in
the system that affects the EBS control, response signal generation or transmission.
5 Performance requirements
5.1 Braking performance
Under normal working conditions of EBS, the service braking performance
requirements specified in 5.2.1 of GB 12676-2014 and the anti-lock braking
performance requirements specified in Clause 5 of GB/T 13594-2003 shall be met.
When the electronic control function fails, the backup brake control function shall meet
the emergency braking performance requirements specified in 5.2.2 of GB 12676-2014.
5.2 Response time
5.2.1 For vehicles equipped with an electronic braking system, in the electronic control
mode, when the actuation time is 0.2 s, the time from the start of actuation of the brake
system control device to the time when the pressure in the brake chamber reaches 75 %
of the steady-state maximum pressure value shall not exceed 0.5 s.
5.2.2 For vehicles with trailer control function, the following requirements shall be met
in the electronic control mode:
a) According to the method of B.2.5 in GB 12676-2014, the time from the actuation
of the brake pedal to the time when the pressure measured at the air pressure
control pipe joint reaches 75 % of the target value shall not exceed 0.4 s;
b) According to ISO 11992-2:2023, the time from the actuation of the brake pedal to
the time when the digital command value of the electronic control circuit reaches
75 % of the target value shall not exceed 0.3 s.
5.3 Deceleration control
When the electronic braking system adopts the electronic control mode, under the
premise that the brake assist function is not activated, the deviation between the average
no-load deceleration and the average full-load deceleration corresponding to the same
pedal position shall not exceed 20 %.
5.4 Brake assist
When the electronic braking system identifies an emergency braking condition, at least
one wheel triggers the anti-lock braking system (ABS) full cycle or the braking
efficiency is not less than 90 % of the mean fully developed deceleration (MFDD) of
the full-load engine disengagement type 0 test specified in 5.1.4 of GB 12676-2014.
6 Test conditions
6.1 Environmental conditions
During the test, the wind speed shall be less than 5 m/s and the ambient temperature
shall not be higher than 35 ℃.
6.2 Road conditions
6.2.1 The test road shall be dry, flat and solid.
6.2.2 The slope of the test road surface on any 50 m length in the longitudinal direction
shall be less than 1%.
6.2.3 Unless otherwise specified, the test road surface shall have good adhesion.
6.3 Vehicle status
6.3.1 The vehicle shall be run-in according to the run-in procedure specified by the
manufacturer or the requirements of 5.1.1.2 of GB 12676-2014.
6.3.2 The mass status of the test vehicle shall comply with the empty and full load
distribution specified by the manufacturer and shall be stated in the test report.
6.3.3 At the beginning of the test, the tires shall be cold and at the specified pressure
status corresponding to the actual wheel load when the vehicle is stationary.
6.3.4 During the test, auxiliary braking systems such as retarding braking system and
type A electric regenerative braking system shall be turned off; for type B electric
regenerative braking system, the battery charge status shall ensure that the braking force
provided by the electric regenerative bra...