GB/T 44287-2024 Performance requirement and testing methods for electronic braking system (EBS) of commercial vehicle
1 Scope
This document specifies the general requirements, performance requirements, test conditions and testing methods for electronic braking system (EBS) of commercial vehicles.
This document is applicable to Class M2, Class M3, Class N2 and Class N3 vehicles equipped with EBSs in accordance with the requirements of GB/T 15089.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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 purposes of this document, the terms and definitions given in GB/T 5620 and GB 12676-2014 and the following apply.
3.1
electronic braking system; EBS
pneumatic brake system that generates and transmits control signals in the form of electric signals and controls the generated braking force through outputting the electric signals
3.2
electronic control function
function of an electronic control unit (ECU) that sends an electronic control command to brake a vehicle after the ECU receives an electronic control signal output by a driver to operate an electronically controlled master valve through a brake pedal or an external braking request sent by other modules through a bus
Note 1: An electrically controlled brake master valve refers to a device that converts the position of a brake pedal into an electronic control signal and an air pressure control signal
Note 2: ECU refers to a component designed to process the information provided by the sensor(s) and to send control signals
3.3
deceleration control
function of determining the brake deceleration of a vehicle according to the position of brake pedal
3.4
brake assist; BA
function of EBS that can automatically provide greater braking efficiency than that corresponding to the pedal position or trigger the full cycle of an anti-lock braking system according to a driver's emergency braking needs
4 General requirements
4.1 A vehicle equipped with EBS shall have at least electronic control functions such as service braking, anti-lock braking, deceleration control and braking assist. In case of the failure of electronic control function, a service braking system shall have a backup brake control function, that is, to control air pressure and provide braking force to realize emergency braking.
4.2 Electronically controlled pneumatic braking system shall have self-check function.
4.3 The vehicle shall be equipped with an EBS fault signal device complying with the requirements of 4.4 and alarm the driver in case of any fault of the system affecting the generation or transmission of EBS control and response signals.
4.4 The EBS fault signal device shall meet the following requirements:
a) It shall be at a position in front of the driver, and easy for him or her to inspect the state of the fault signal device at the driving position.
b) It shall be indicated by the symbol for "EBS fault signal" as shown in Figure 1.
c) Yellow or red alarm signal shall be used according to the provisions of 4.2.1.28 a) in GB 12676-2014.
d) The fault signal device shall be bright and eye-catching after being lit so that the driver can clearly observe whether driving in the daytime or at night after adapting to the environmental road lighting conditions;
e) If a fault exists, the EBS fault signal device shall be lit up; as long as an ignition switch is in the "RUN" position, the EBS fault signal device shall remain constantly on until the fault is eliminated.
g) The EBS fault signal device shall be lit for functional inspection when the ignition switch is in the "ON" ("RUN") position or the ignition switch is between "ON" ("RUN") and "Start" (the manufacturer's specified inspection position); This requirement does not apply to a signal device located in common space. For some specific failures or faults that shall be provided with alarm signals but not found during static detection, once detected, these faults or failures shall be stored, and as long as the faults or failures still exist, the above alarm signals shall be continuously displayed when the ignition switch is in the "ON" ("RUN") position. Sensor anomalies, which cannot be detected under static conditions, shall be detected not later than when the vehicle speed exceed 10 km/h. However, to prevent erroneous fault indication when a sensor is not generating a vehicle speed output, due to non-rotation of a wheel, verification may be delayed but detected not later than when the vehicle speed exceeds 15 km/h.
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Functional requirements
6 Test conditions
7 Test methods
GB/T 44287-2024 Performance requirement and testing methods for electronic braking system (EBS) of commercial vehicle
1 Scope
This document specifies the general requirements, performance requirements, test conditions and testing methods for electronic braking system (EBS) of commercial vehicles.
This document is applicable to Class M2, Class M3, Class N2 and Class N3 vehicles equipped with EBSs in accordance with the requirements of GB/T 15089.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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 purposes of this document, the terms and definitions given in GB/T 5620 and GB 12676-2014 and the following apply.
3.1
electronic braking system; EBS
pneumatic brake system that generates and transmits control signals in the form of electric signals and controls the generated braking force through outputting the electric signals
3.2
electronic control function
function of an electronic control unit (ECU) that sends an electronic control command to brake a vehicle after the ECU receives an electronic control signal output by a driver to operate an electronically controlled master valve through a brake pedal or an external braking request sent by other modules through a bus
Note 1: An electrically controlled brake master valve refers to a device that converts the position of a brake pedal into an electronic control signal and an air pressure control signal
Note 2: ECU refers to a component designed to process the information provided by the sensor(s) and to send control signals
3.3
deceleration control
function of determining the brake deceleration of a vehicle according to the position of brake pedal
3.4
brake assist; BA
function of EBS that can automatically provide greater braking efficiency than that corresponding to the pedal position or trigger the full cycle of an anti-lock braking system according to a driver's emergency braking needs
4 General requirements
4.1 A vehicle equipped with EBS shall have at least electronic control functions such as service braking, anti-lock braking, deceleration control and braking assist. In case of the failure of electronic control function, a service braking system shall have a backup brake control function, that is, to control air pressure and provide braking force to realize emergency braking.
4.2 Electronically controlled pneumatic braking system shall have self-check function.
4.3 The vehicle shall be equipped with an EBS fault signal device complying with the requirements of 4.4 and alarm the driver in case of any fault of the system affecting the generation or transmission of EBS control and response signals.
4.4 The EBS fault signal device shall meet the following requirements:
a) It shall be at a position in front of the driver, and easy for him or her to inspect the state of the fault signal device at the driving position.
b) It shall be indicated by the symbol for "EBS fault signal" as shown in Figure 1.
c) Yellow or red alarm signal shall be used according to the provisions of 4.2.1.28 a) in GB 12676-2014.
d) The fault signal device shall be bright and eye-catching after being lit so that the driver can clearly observe whether driving in the daytime or at night after adapting to the environmental road lighting conditions;
e) If a fault exists, the EBS fault signal device shall be lit up; as long as an ignition switch is in the "RUN" position, the EBS fault signal device shall remain constantly on until the fault is eliminated.
g) The EBS fault signal device shall be lit for functional inspection when the ignition switch is in the "ON" ("RUN") position or the ignition switch is between "ON" ("RUN") and "Start" (the manufacturer's specified inspection position); This requirement does not apply to a signal device located in common space. For some specific failures or faults that shall be provided with alarm signals but not found during static detection, once detected, these faults or failures shall be stored, and as long as the faults or failures still exist, the above alarm signals shall be continuously displayed when the ignition switch is in the "ON" ("RUN") position. Sensor anomalies, which cannot be detected under static conditions, shall be detected not later than when the vehicle speed exceed 10 km/h. However, to prevent erroneous fault indication when a sensor is not generating a vehicle speed output, due to non-rotation of a wheel, verification may be delayed but detected not later than when the vehicle speed exceeds 15 km/h.
Contents of GB/T 44287-2024
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Functional requirements
6 Test conditions
7 Test methods
