GB/T 37471-2019 English PDF (GBT37471-2019)

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GB/T 37471-2019: Intelligent transportation systems -- Lane change decision aid systems -- Performance requirements and test procedures
GB/T 37471-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 03.220.20; 35.240.60
R 87
Intelligent transportation systems - Lane change
decision aid systems - Performance requirements and
test procedures
[ISO 17387:2008, Intelligent transport systems - Lane change decision aid
systems (LCDAS) - Performance requirements and test procedures, NEQ]
ISSUED ON: MAY 10, 2019
IMPLEMENTED ON: DECEMBER 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
Introduction ... 4 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 System classification ... 10 
5 Functional and performance requirements ... 14 
6 Test requirements ... 23 
Appendix A (Informative) Example of blind spot warning ... 44 
References ... 59 
Intelligent transportation systems - Lane change
decision aid systems - Performance requirements and
test procedures
1 Scope
This standard specifies the classification, function and performance
requirements and test requirements of the lane change decision aid system
(LCDAS).
This standard applies to the lane change decision aid system installed in
category M (including category M1, M2, M3) and N (including category N1, N2,
N3) vehicles under forward driving conditions. It is not applicable to the similar
systems installed in category O (including category O1, O2, O3, O4) and L
(including category L1, L2, L3, L4, L5) vehicles.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB 7258-2012 Safety specifications for power-driven vehicles operating on
roads
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Subject vehicle
A vehicle equipped with a lane change decision aid system.
3.2
Target vehicle
vr(t) - The closing speed, in meters per second (m/s).
3.10
Overtaking speed
The difference between the speed of the subject vehicle and the speed of
the target vehicle during the process of the subject vehicle overtaking the
target vehicle.
Note: When the speed of the subject vehicle is higher than the target vehicle,
the overtaking speed is positive.
3.11
Blind spot warning function
If the target vehicle is detected in the adjacent zone, it will warn the driver of
the subject vehicle.
3.12
Closing vehicle warning function
If a closing vehicle is detected in the rear zone, it will warn the driver of the
subject vehicle.
3.13
Lane change warning function
The function which includes the blind spot warning function and closing
vehicle warning function.
4 System classification
4.1 Classification by coverage zone
4.1.1 Classification basis
LCDAS is classified according to the minimum limit of the required coverage
range, as shown in Table 1.
c) For category A systems, if the radius of the curve is less than X m, the
system may not be able to provide adequate warnings. Among them, X
refers to the limit curve radius of the system work; the radius shall not
exceed 125 m.
d) For category B systems, if the radius of the curve is less than X m, the
system may not be able to provide sufficient warning. Among them, X
refers to the limit curve radius of the system work; the radius shall not
exceed 250 m.
e) For category C systems, if the radius of the curve is less than X m, the
system may not be able to provide sufficient warning. Among them, X
refers to the limit curve radius of the system work; the radius shall not
exceed 500 m.
5 Functional and performance requirements
5.1 LCDAS functional requirements
5.1.1 Inactive working state and basic functions
LCDAS will not provide any warning to the driver when it is inactive. The system
in the inactive state can enter the standby mode. At this time, the system can
still monitor the target vehicle. Because it is in the inactive state, it will not
provide any warning to the driver. The system in the inactive state can also be
turned off directly without entering the standby mode.
5.1.2 Activation conditions
The activation condition is the judging criteria for LCDAS to switch between the
inactive state and the active state. When the activation condition is met, the
LCDAS is switched from the inactive state to the active state, otherwise the
system is switched from the active state to the inactive state. The activation
conditions can be several parallel judgment criteria; the system can use the
activation conditions listed below, but it is not limited to the following:
a) Continuous activation: When the vehicle ignition is switched to "on", the
system will enter the active state.
b) Manual activation: The driver manually operates through a certain device
to control the switching of the system between the inactive state and the
active state. The device can be a button, a switch or a menu-based user
interface, but it is not limited to the above.
c) Turn signal activation: LCDAS can control the switching between the
inactive state and the active state through the turn signal of the subject
Straight-line H - Parallel to the center line of the vehicle and is located 6 m along the
left side of the leftmost side of the subject vehicle;
Straight-line J - Parallel to the center line of the vehicle and is located at the rightmost
edge of the subject vehicle excluding the exterior rearview mirror;
Straight-line K - Parallel to the center line of the vehicle and is located 0.5 m along the
right side of the rightmost side of the subject vehicle;
Straight-line L - Parallel to the center line of the vehicle and is located 3 m along the
right side of the rightmost side of the subject vehicle;
Straight-line M - Parallel to the center line of the vehicle and is located 6 m along the
right side of the rightmost side of the subject vehicle;
Straight-line N - The extension of the rear edge of the vehicle to the left and right ends;
Straight-line O - Parallel to the rear edge of the vehicle and is located 10 m behind it.
Figure 10 -- Location description of warning requirements
5.2.2 Minimum measurable target vehicle
LCDAS shall be able to detect at least one of all motorcycle types as specified
in GB 7258-2012.
5.2.3 Requirements for blind spot warning function
5.2.3.1 Warning requirements for blind spot warning function
The blind spot warning function shall cover adjacent zones, as shown in the
shaded areas 3 and 4 in Figure 10. If the left or right warning requirements are
met, the system shall issue a corresponding blind spot warning; if the warning
requirements are not met, the system shall not issue the blind spot warning;
please refer to the example of blind spot warning in Appendix A. The left and
right blind spot warning requirements must meet the following conditions:
a) The conditions required for the blind spot warning in the left area are as
follows:
1) Any part of the target vehicle has crossed the straight-line B;
2) The target vehicle is completely located in the area behind the straight-
line C;
3) The target vehicle is completely on the left side of the straight-line F;
4) Any part of the target vehicle crosses the stra...