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

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

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.
GB/T 37471-2019
GB
NATIONAL STANDARD OF THE
PEOPLE 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 straight-line G to the right. the switch shall have an indicator light.
When the indicator light on the LCDAS switch is on, it prompts the driver "LCDAS is not working".
5.3.2 LCDAS active state indication
The LCDAS active state indicator can be used to tell the driver of the subject vehicle that LCDAS is in working state (see 5.1). If the driver can activate or deactivate the system manually, the system shall contain both the system inactive state indicator and the active state indicator. The device that activates the system is a switch, so that the driver can activate or deactivate the system manually.
LCDAS work instructions shall be visible; meanwhile it shall clearly remind the driver that "LCDAS is in working state".
5.3.3 LCDAS warning indication
The LCDAS warning reminds the driver of the subject vehicle that the lane changing behavior is dangerous (see 5.1). When the system is in the warning state, the LCDAS warning indicator device shall be able to warn.
When in a level 1 warning state (see 5.1), the system warning indication shall only be visible. When in the warning state of level 2 or above, the system warning indication can be in various ways including visual, auditory or tactile warning. This standard suggests that the warning indicator can indicate the area where the target vehicle is currently located in some way. It is recommended that the visual warning indicator be installed in a place that is easy to identify and does not affect the use of the outside rearview mirror. The visual warning shall be clearly distinguished from other forms of visual signals in the vehicle. If an audible warning is used, it shall be clearly distinguished from other audible signals in the vehicle. If a tactile warning is used, it shall be clearly distinguished from other tactile signals in the vehicle.
5.3.4 LCDAS fault indication
When LCDAS detects a system fault through the self-check function (see 5.4), the system shall notify the driver through the fault indication function. The LCDAS fault indication shall clearly indicate the failure of the driver's system by means of vision, hearing or a combination of vision and hearing. 5.4 Self-check requirements of subject vehicle
After the system is activated, the system shall at least provide the following self- check functions:
vehicle and the rear edge of the test target vehicle;
d) The test target vehicle is located on the left side of the subject vehicle; it can measure the lateral clearance between the leftmost side of the subject vehicle and the rightmost side of the test target vehicle;
e) If the test target vehicle is located on the right side of the subject vehicle, the lateral clearance between the rightmost side of the subject vehicle and the leftmost side of the test target vehicle;
f) It can measure the time delay from the moment when the test target vehicle meets the warning conditions to the moment when the warning is issued;
g) It can measure the time delay from the moment when the warning
condition is no longer met to the moment when the warning ends.
6.3.1.2 For all test processes, the test measurement system has the following accuracy:
a) Clearance measurement accuracy:
1) For clearances less than 2 m, the accuracy shall be 0.1 m or higher; 2) For clearances greater than 2 m and less than 10 m, the accuracy shall be 5% or higher;
3) For clearances greater than 10 m, the accuracy shall be 0.5 m or higher. b) Time measurement accuracy:
1) For time less than 200 ms, the accuracy shall be 20 ms or higher;
2) For time greater than 200 ms and less than 1 s, the accuracy shall be 10% or higher;
3) For times greater than 1 s, the accuracy shall be 100 ms or higher.
6.3.2 Blind spot warning test method
6.3.2.1 The target vehicle overtakes the subject vehicle
The blind spot warning test of the target vehicle overtaking the subject vehicle. The straight-line?€?s definition is as shown in Figure 11 and 5.2.1. The test steps and test requirements are as follows:
a) The test shall be carried out according to the following steps:
1) On a straight and flat test route, the subject vehicle shall drive along a straight-line at a fixed speed of not less than 20 m/s;
line H, the system shall not issue any warning.
2) When the test target vehicle passes straight-line H, the system shall issue a warning to the left side of the subject vehicle. The warning time shall not be later than the time when the right side of the test target vehicle passes the straight-line G plus the system response time
required by 5.2.6.
3) The system shall keep warning at least until the right side of the test target vehicle passes straight-line F.
4) The system termination warning shall be issued no later than the time after the left side of the test target vehicle passes straight-line E plus the system response time required by 5.2.6.
5) When the test vehicle is completely located between the straight-line E ~ J, the system shall not issue any warning.
6) After the test target vehicle passes straight-line J, the system shall issue a warning to the right side of the vehicle. The warning time shall not be later than the time when the left side of the test target vehicle passes the line K plus the system response time required by 5.2.6.
7) The system shall keep warning at least until the left side of the test target vehicle passes straight-line L.
8) The system termination warning shall be issued no later than the time after the left side of the test target vehicle passes straight-line M plus the system response time required in 5.2.6.
c) When the test target vehicle moves from right to left, the system shall meet the following test requirements:
1) When the test target vehicle is completely on the right side of the line M, the system shall not issue any warning.
2) When the test target vehicle passes straight-line M, the system shall issue a warning to the right side of the subject vehicle. The warning
time shall not be later than the time when the left side of the test target vehicle passes the straight-line L plus the system response time
required by 5.2.6.
3) The system shall keep warning at least until the left side of the test target vehicle passes straight-line K.
4) The system termination warning shall be issued no later than the time after the right side of the test target vehicle passes straight-line J plus b) Time measurement accuracy:
1) For time less than 200 ms, the accuracy shall be 20 ms or higher;
2) For time greater than 200 ms and less than 1 s, the accuracy shall be 10% or higher;
3) For times greater than 1 s, the accuracy shall be 100 ms or higher.
6.4.2 Test method of closing vehicle warning
6.4.2.1 The target vehicle overtakes the subject vehicle
For the closing vehicle warning test when the target vehicle approaches and overtakes the subject vehicle, the straight-line definition is as shown in Figure 14 and 5.2.1. The test provisions and test requirements are as follows: a) The test shall be carried out as follows:
1) On a flat test route, the subject vehicle is driving at a steady speed within the range specified in Table 8;
2) The test target vehicle shall drive straight as shown in Figure 14, so that its closing speed is within the range specified in Table 8.
3) The two vehicles travel in this way, so that the lateral clearance between the outermost edge of the subject vehicle (excluding the outer rearview mirrors on both sides of the vehicle) and the center line of the test target vehicle is 2.0 m ~ 3.0 m;
4) Before the test starts, the test target vehicle shall be at least 150 m behind the subject vehicle.
b) When the test target vehicle approaches and overtakes the subject vehicle, the system shall meet the following test requirements:
1) When the estimated time to collision of the test target vehicle is 7.5 s or longer, the system shall not issue any warning.
2) The system shall issue a warning to the corresponding side of the
subject vehicle. The warning time shall not be later than 0.3 s after the test target vehicle meets the time to collision value as required in Table 3.
3) The system shall keep warning at least until the leading edge of the test target vehicle passes straight-line B.
4) The issuing time of the system termination warning shall not be later f) The test target vehicle is located on the right side of the subject vehicle; it can measure the lateral clearance between the rightmost side of the
subject vehicle and the leftmost side of the test target vehicle;
g) It can measure the time delay from the moment when the test target
vehicle meets the warning conditions to the moment when the warning is
issued;
h) It can measure the time delay from the moment when the warning
condition is not met to the moment when the warning ends.
6.5.1.2 For all test processes, the test measurement system shall have the following accuracy:
a) Clearance measurement accuracy:
1) For the clearance of less than 2 m, the accuracy is 0.1 m or higher; 2) For the clearance of greater than 2 m and less than 10 m, the accuracy is 5% or higher;
3) For the clearances of greater than 10 m, the accuracy is 0.5 m or higher. b) Time measurement accuracy:
1) For a time less than 200 ms, the accuracy is 20 ms or higher;
2) For a time greater than 200 ms and less than 1 s, the accuracy is 10% or higher;
3) For a time greater than 1 s, the accuracy is 100 ms or higher.
6.5.2 Lane change warning test method
6.5.2.1 The target vehicle overtakes subject vehicle
For the lane change warning test of the target vehicle approaching and
overtaking the vehicle, the straight-line definition is as shown in Figure 16 and 5.2.1. The test provisions and test requirements are as follows:
a) The test shall be carried out as follows:
1) On a flat test route, the speed of the subject vehicle and the closing speed of the test target vehicle shall be driven stably within the range specified in Table 12, so that the lateral clearance between the
outermost edge of the subject vehicle (excluding the outer rearview
mirrors on both sides of the vehicle) and the center lines of the test
target vehicle is maintained at 2.0 m ~ 3.0 m;
line H, the system shall not issue any warning.
b) When the test target vehicle passes straight-line H, the system shall issue a warning to the left side of the subject vehicle. The warning time shall not be later than the time when the right side of the test target vehicle passes the straight-line G plus the system response time required by 5.2.6.
c) The system shall keep warning at least until the right side of the test target vehicle passes straight-line F.
d) The system termination warning shall be issued no later than the time after the left side of the test target vehicle passes straight-line E plus the system response time required by 5.2.6.
e) When the test vehicle is completely located between the straight-line E ~ J, the system shall not issue any warning.
f) After the test vehicle passes straight-line J, the system shall issue a warning to the right side of the subject vehicle. The warning time shall not be later than the time when the left side of the test target vehicle passes the line K plus the system response time required by 5.2.6.
g) The system shall keep warning at least until the left side of the test target vehicle passes straight-line L.
h) The system termination warning shall be issued no later than the time after the left side of the test target vehicle passes straight-line M plus the system response time required in 5.2.6.
When the test target vehicle moves from right to left, the system shall meet the following test requirements:
a) When the test target vehicle is completely on the right side of the straight- line M, the system shall not issue any warning.
b) When the test target vehicle passes straight-line M, the system shall issue a warning to the ...

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