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 5620 道路车辆 汽车和挂车制动名词术语及其定义 GB 12676-2014 商用车辆和挂车制动系统技术要求及试验方法 GB/T 13594-2003 机动车和挂车防抱制动性能和试验方法 GB/T 15089 机动车辆及挂车分类 ISO 11992-2:2023 道路车辆引车和挂车之间电气连接数字信息交换第2部分:制动和行驶系统应用层(Road vehicles-Interchange of digital information on electrical connections between towing and towed vehicles-art 2: Application layer for brakes and running gear)
3 术语和定义 GB/T 5620和GB 12676-2014界定的以及下列术语和定文适用于本文件 3.1 电控气压制动系统electronic braking system；EBS 以电信号的形式产生和传输控制信号，并通过输出电信号控制产生制动力的气压制动系统 3.2 电子控制功能electronic control function 电子控制单元(ECU)接收驾驶人通过制动踏板操纵电控制动总阀输出的电控信号或其他模块通过总线发出的外部制动请求后，发送电控指令，对车辆进行制动的功能。 注1:电控制动总阀指的是将制动踏板位置转化为电控信号和气压控制信号的装置 注2:电子控制单元指的是用于处理传感器提供的信息，并发出控制指令的部件。 3.3 减速度控制deceleration control 按制动踏板位置确定车辆的制动减速度的功能 3.4 制动辅助brake assist; BA 电控气压制动系统根据驾驶人的紧急制动需求，能自动提供比踏板位置对应的更大的制动效能或触发防抱制动系统全循环的功能。 4 一般要求 4.1 安装电控气压制动系统的车辆，应至少具有行车制动、防抱制动、减速度控制、制动辅助等电子控制功能。当电子控制功能失效时，行车制动系统应具有备份制动控制功能，通过气压控制并提供制动力以实现应急制动。 4.2 电控气压制动系统应具有自检功能。 4.3 车辆应安装符合4.4要求的EBS故障信号装置，并在系统发生任何影响到EBS控制、响应信号产生或传输的故障时向驾驶人报警。 4.4 对ESB故障信号装置的要求如下 a) 处于驾驶人前方视野范围内，便于驾驶人在驾驶位置检查故障信号装置的状态是否正常。 b) 应采用图1所示的“EBS故障信号”标识符号进行指示。 c) 应按照GB 12676-2014中4.2.1.28 a)的规定使用黄色或红色报警信号。 d) 故障信号装置点亮后应足够明亮、醒目，使驾驶人在适应环境道路照明条件后，无论白天或者夜晚都清晰观察。 e) 如果有故障存在，EBS故障信号装置就应点亮；并且，只要点火开关处于“ON”(“RUN”)位置。EBS故障信号装置就应保持常亮，直至故障消除。 当点火开关置于“ON”(“RUN”)位置或者当点火开关处于“ON”(“RUN”)和“Start”之间(制造商指定的检查位置)时，应点亮EBS故障信号装置对其进行功能检查。该要求不适用于在共用空间显示的信号装置。对某些应点亮上述报警信号在静态检测时没发现的特定失效或故障，一旦检测到应给予存储，只要特定失效或故障仍然存在，当点火开关置于“ON”(“RUN”)位置时将一直显示。对在静态条件下不能检测到的传感器异常，应在车速大于10km/h之前完成检测，但由于静态条件下车轮不转动，传感器不产生车速信号，为防止发出错误的报警信号，可推迟检测，但应在车速大于15km/h之前确认传感器工作正常。
