GB/T 44156-2024 English PDF (GBT44156-2024)

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GB/T 44156-2024: Performance requirements and testing methods for rear cross traffic alert system of passenger cars
GB/T 44156-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040
CCS T 40
GB/T 44156-2024
Performance requirements and testing methods for rear
cross traffic alert system of passenger cars
ISSUED ON: JUNE 29, 2024
IMPLEMENTED ON: JUNE 29, 2024
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 ... 6
4.1 Functional requirements ... 6
4.2 Self-check requirements ... 7
4.3 Status prompt requirements ... 7
4.4 Electromagnetic compatibility requirements ... 7
5 Performance requirements ... 7
5.1 Collision prompt form requirements ... 7
5.2 Collision prompt condition requirements ... 7
6 Test methods ... 8
6.1 Test environment conditions ... 8
6.2 Test equipment ... 8
6.3 Measurement system ... 8
6.4 Motor vehicle cross test ... 9
6.5 Bicycle cross test ... 10
6.6 Pedestrian cross test ... 11
Performance requirements and testing methods for rear
cross traffic alert system of passenger cars
1 Scope
This document specifies the performance requirements for the rear cross traffic alert
system of passenger cars and describes the corresponding test methods.
This document applies to M1 vehicles equipped with a rear traffic alert system.
NOTE: Without causing confusion, the “rear cross traffic alert system” in this document is referred
to as the “RCTA system”.
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 34660 Road vehicles - Requirements and test methods of electromagnetic
compatibility
GB/T 39263 Road vehicles - Advanced driver assistance systems - Terms and
definitions
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T 39263 and
the following apply.
3.1
rear cross traffic alert system
A system that monitors other road users approaching laterally from behind the vehicle
in real time when the vehicle is reversing, and issues warning information when there
is a risk of collision.
3.2
subject vehicle
b) When the vehicle is reversing, the Type II RCTA system shall at least monitor the
cars, motorcycles, bicycles and pedestrians approaching laterally from behind the
vehicle in real time, and issue a warning message when there is a risk of collision.
4.2 Self-check requirements
4.2.1 The RCTA system shall at least perform a self-check after power-on.
4.2.2 The RCTA system shall at least have the following self-check functions:
a) Check whether the relevant electrical components are operating normally;
b) Check whether the relevant sensor elements are operating normally.
4.2.3 When an electronic or electrical fault occurs, the fault prompt information shall
be clearly observed by the driver and clearly distinguished from the collision prompt.
4.3 Status prompt requirements
The RCTA system shall allow the driver to actively turn it on/off, and its on/off status
shall be visually visible.
4.4 Electromagnetic compatibility requirements
The electromagnetic compatibility of the RCTA system shall comply with the
provisions of GB 34660.
5 Performance requirements
5.1 Collision prompt form requirements
The collision prompt form of the RCTA system shall meet the following requirements:
a) At least one among the senses of sight, hearing, and touch;
b) Prompt information that is easily perceived by the driver and clearly distinguished
from other systems in the vehicle;
c) Clearly indicate the direction in which the target appears.
5.2 Collision prompt condition requirements
The Type I RCTA system shall be tested in accordance with 6.4 and 6.5, and the Type
II RCTA system shall be tested in accordance with 6.4, 6.5, and 6.6. When the target
approaches the subject vehicle from the left and/or right, the RCTA system shall issue
a collision prompt when the time to collision (TTC) is not less than 1.7 s, and the
collision prompt form meets the requirements of 5.1.
6 Test methods
6.1 Test environment conditions
6.1.1 The test road shall be a level, dry, concrete or asphalt road surface with good
adhesion.
6.1.2 The ambient temperature shall be -20 ℃ ~ 45 ℃.
6.1.3 The horizontal visual range shall ensure that the target can be clearly observed
throughout the test.
6.2 Test equipment
6.2.1 The target vehicle shall be a common mass-produced M1 vehicle or a flexible
target of which the characterization parameters can represent the vehicle.
6.2.2 The target bicycle shall be a common mass-produced bicycle or a flexible target
of which the characterization parameters can represent the bicycle. The length of the
bicycle shall be (1.8 ± 0.2) m, and the height (including an adult rider) shall be (1.7 ±
0.2) m.
6.2.3 The target pedestrian shall be an adult target dummy and a child target dummy.
The height of the adult target dummy shall be (1.8 ± 0.1) m (excluding the track), and
the height of the child target dummy shall be (1.1 ± 0.1) m (excluding the track).
6.2.4 The blocking vehicle shall be a common mass-produced M1 vehicle or a flexible
target of which the characterization parameters can represent the vehicle, and shall meet
the following requirements:
a) The minimum ground clearance of the vehicle shall not exceed 150 mm;
b) The departure angle of the vehicle shall not exceed 25°.
NOTE: A flexible target refers to a target that can reduce the collision damage of the subject vehicle
during the test, usually including flexible target vehicles, flexible target bicycles, etc.
6.3 Measurement system
6.3.1 The measurement system shall be completely independent of the RCTA system to
be tested.
6.3.2 The accuracy of the measurement system shall meet the following requirements:
a) The distance measurement accuracy shall be at least 0.02 m;
b) The time measurement accuracy shall be at least 30 ms;