GB/T 38186-2019 English PDF (GBT38186-2019)

This Standard specifies the terms and definitions, technical requirements, and test methods for advanced emergency braking system (AEBS) of commercial vehicles. This Standard applies to M2, M3, and N type vehicles equipped with an advanced emergency braking system (AEBS).

GB/T 38186-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.40
T 24
Performance requirements and test methods for
advanced emergency braking system (AEBS) of
commercial vehicles
ISSUED ON: OCTOBER 18, 2019
IMPLEMENTED ON: MAY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Technical requirements ... 6
5 Test methods ... 10
Appendix A (Normative) Functional safety requirements ... 13
Performance requirements and test methods for
advanced emergency braking system (AEBS) of
commercial vehicles
1 Scope
This Standard specifies the terms and definitions, technical requirements, and test methods for advanced emergency braking system (AEBS) of commercial vehicles.
This Standard applies to M2, M3, and N type vehicles equipped with an
advanced emergency braking system (AEBS).
2 Normative references
The following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document.
GB/T 3730.1-2001 Motor vehicles and trailers - Types - Terms and definitions GB 4094-2016 Motor vehicles - Symbols for controls, indicators and tell-tales GB/T 5620 Road vehicles - Braking of automotive vehicles and their trailers - Vocabulary
GB 12676-2014 Technical requirements and testing methods for commercial vehicle and trailer braking systems
GB/T 13594 Antilock braking performance and test procedure for motor
vehicles and their trailers
GB/T 34590-2017 (all parts) Road vehicles - Functional safety
GB 34660-2017 Road vehicles - Requirements and test methods of
electromagnetic compatibility
collision may occur in the front to the time before the emergency braking phase of the vehicle.
3.9 Common space
The area in which two or more information functions (such as flags) can be displayed asynchronously.
[GB 4094-2016, definition 3.6]
3.10 Self-check
The act of automatically checking the AEBS failure and testing its functions in a semi-continuous manner before the AEBS starts.
3.11 Time to collision; TTC
The time obtained by dividing the distance between the subject vehicle and the target by the instantaneous relative speed of the subject vehicle and the target. 4 Technical requirements
4.1 General requirements
4.1.1 Vehicles equipped with AEBS shall be equipped with an antilock braking system which meets the requirements of GB/T 13594.
4.1.2 The electromagnetic compatibility of AEBS shall meet the requirements of GB 34660-2017.
4.1.3 The functional safety of AEBS shall meet the requirements of Appendix A. 4.1.4 The vehicle manufacturer shall, in the vehicle instruction manual, explain the early-warning and warning signal indication methods and the order of warning to the driver.
4.2 Early-warning and warning signals
4.2.1 The AEBS shall be able to provide the driver with the appropriate early- warning and warning signals as follows:
a) When the AEBS detects a possible collision with an M, N, or O type vehicle which may be traveling at a lower speed, decelerating, or stationary in the same lane ahead, it shall send a collision early-warning signal. The early- warning signal shall comply with the provisions of 4.2.2.
b) In the event of an AEBS failure which may prevent compliance with the phase, so that the speed of the subject vehicle is significantly reduced; b) Except for manual off according to 4.5, AEBS, under all load conditions of the vehicle, shall operate normally at least between 15 km/h and the
maximum design speed;
c) In cases where the driver does not believe that there will be a collision with the vehicle in front, the AEBS design shall minimize the sending of
collision early-warning signals and avoid automatic braking.
4.3.2 Early-warning and startup performance under stationary target
conditions
4.3.2.1 TEST according to 5.4. The time setting of the collision early-warning mode described in 4.2 shall meet the following requirements:
a) The subject vehicle begins to use one mode of acoustics, tactile sense, and optics for early-warning no later than the following time:
- 1.4 s before the start of the emergency braking phase for vehicles of air braking system;
- 0.8 s before the start of the emergency braking phase for M2 and M3 type vehicles with assisted hydraulic braking system and N2 type vehicles with a maximum design total mass less than or equal to 8 t.
b) The subject vehicle begins to use two modes of acoustics, tactile sense, and optics for early-warning no later than the following time:
- 0.8 s before the start of the emergency braking phase for vehicles of air braking system;
- Before the start of the emergency braking phase for M2 and M3 type
vehicles with assisted hydraulic braking system and N2 type vehicles with a maximum design total mass less than or equal to 8 t.
4.3.2.2 The speed decline in the warning phase shall not exceed 15 km/h or 30% of the total speed decline of the test vehicle, whichever is higher.
4.3.2.3 The collision warning phase shall be followed by the emergency braking phase.
4.3.2.4 The total speed decline of the subject vehicle when colliding with a stationary target shall not be less than 10 km/h.
4.3.2.5 The emergency braking phase shall not begin before the time to collision is less than or equal to 3 s.
a) The AEBS shall, when the vehicle is ignited, automatically restore to normal working state;
b) After the AEBS function is turned off, it shall be able to send the driver a constant yellow optical warning signal in accordance with the provisions of GB 4094-2016.
4.6 Anti-false response performance
TEST according to 5.8. The AEBS shall not send a collision early-warning and shall not activate the emergency braking function.
5 Test methods
5.1 Test conditions
5.1.1 The test environment shall comply with the provisions of 5.1.2 of GB 12676-2014.
5.1.2 The horizontal visual range shall ensure that the target can be observed throughout the test.
5.2 Vehicle conditions
5.2.1 Vehicle load
The vehicle shall be tested under the load conditions specified by the
manufacturer. After the test starts, it shall not make any adjustments to the vehicle load.
5.2.2 Tire
The tires used in the test shall be run-in to a normal state. The tire pressure shall be the cold inflation pressure value recommended by the vehicle
manufacturer.
5.2.3 Brake
The subject vehicle shall, in accordance with the provisions of 5.1.1.2 of GB 12676-2014, run-in the brake.
5.3 Test target
5.3.1 The test may adopt an ordinary passenger car or a soft target.
5.3.2 Specific measures to ensure consistency and repeatability of targets shall be documented in detail in the vehicle test report.
5.7 Driver intervention performance
5.7.1 TEST according to 5.5. In the warning phase, the driver steps on the accelerator pedal, turns on the turn signal, performs other means specified by the manufacturer, to check whether the response of the system can be
interrupted by the active action of driver intervention.
5.7.2 TEST according to 5.5. In the emergency braking phase, the driver steps on the accelerator pedal, turns on the turn signal, performs other means specified by the manufacturer, to check whether the response of the system can be interrupted by the active action of driver.
5.7.3 For vehicles equipped with an AEBS release device, set the ignition switch to the "on" (run) position and release the AEBS, to check if the warning signal is lit. SET the ignition switch to the "off" (flameout) position. Then, set the ignition switch to the "on" (run) position again, to confirm that whether the warning signal which was previously lit is lit. If the ignition system is activated by a key, the above operation shall be performed without removing the key at all times. 5.8 System anti-false response performance
5.8.1 PUT two ordinary passenger cars defined in GB/T 3730.1-2001 as follows: a) The driving direction is the same as that of the subject vehicle;
b) The inside of the two cars is 4.5 m apart;
c) The tails of the two cars are aligned.
5.8.2 The subject vehicle, from outside at least 60 m, begins to pass through the middle of two stationary vehicles at a constant speed of (50±2)km/h. Except for slight adjustment of the steering wheel to prevent the vehicle from shifting in direction, during the test, it shall not make any adjustments to the subject vehicle.
A.2.2 Definition of related items
A.2.2.1 It shall describe the functional concept of the related items and provide a list of functional descriptions. The related item AEBS may include an environmental awareness system, a control system, an execution system, a driver information interaction system, etc.
Note: Describe the functions which are perceptible from the vehicle level and refine them. A.2.2.2 It shall define the scope of the related items and the systems and elements belonging to the related items and identify the external systems or elements with which they interact.
A.2.2.3 It shall define the operating conditions and constraints of the related items, and for the corresponding system functions, explain the boundaries of the effective working range.
Example: Common operating conditions include power supply, speed, etc. Common constraints include ambient temperature, humidity, vibration, etc.
A.2.2.4 It shall provide a schematic diagram (for example, a module diagram) to illustrate the architecture of the related items and their internal and external interfaces. In the schematic diagram, use serial number to indicate the components, external interface systems, internal and external interface channels of the related items. A detailed list is also provided to briefly describe the functions of each component, system, and interface in the list. If a component integrates multiple functions, for clarity and ease of explanation, in the schematic diagram, it may be represented by multiple modules.
A.2.2.5 It shall use identification marks to clearly and unambiguously identify each component of the related items (including hardware and software) and confirm its consistency with the documentation provided. The identification mark shall specify the version of the hardware and software. If the version change causes a change in the function described in this Standard, the
identification mark shall be changed accordingly.
A.2.3 Hazard analysis and risk assessment
A.2.3.1 It shall analyze and classify the functional faults of the related items. Example: Typical analysis methods, such as hazard and operability analysis (HAZOP). A.2.3.2 It shall, based on the vehicle’s target usage scenario and target users, give a list of potential hazards and define the corresponding automotive safety integrity level (ASIL). See GB/T 34590.3-2017.