GB/T 33577-2017 PDF in English
GB/T 33577-2017 (GB/T33577-2017, GBT 33577-2017, GBT33577-2017)
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Intelligent transportation systems -- Forward vehicle collision warning systems -- Performance requirements and test procedures
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Standards related to (historical): GB/T 33577-2017
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GB/T 33577-2017: PDF in English (GBT 33577-2017) GB/T 33577-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 03.220.20;43.040.20
R 87
Intelligent transportation systems - Forward vehicle collision
warning systems - Performance requirements and test
procedures
(ISO 15623:2013, Transport information and control systems - Forward vehicle
collision warning systems - Performance requirements and test procedures,
NEQ)
ISSUED ON: MAY 12, 2017
IMPLEMENTED ON: DECEMBER 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
FOREWORD ... 3
INTRODUCTION ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions... 5
4 Functions and requirements ... 10
5 Performance test method ... 21
Appendix A (Normative) Basic consideration of collision warning ... 30
Appendix B (Normative) Obstacle detection range requirements along curves ... 36
Appendix C (Normative) Sensor performance requirements and test target requirements
... 38
References ... 40
Intelligent transportation systems - Forward vehicle collision
warning systems - Performance requirements and test
procedures
1 Scope
This Standard specifies performance requirements and test procedures for forward
vehicle collision warning systems (hereinafter referred to as FVCWS).
This Standard covers operations on roads with radius of curvature over 125 m, and
motor vehicle including cars, trucks, buses and motorcycles.
Note: Responsibility for the safe operation of the vehicle remains with the driver.
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 7247.1-2012, Safety of laser products - Part 1: Equipment classification and
requirements
GB/T 20608-2006, Intelligent transportation systems - Adaptive cruise control
systems - Performance requirements and test procedures
JTG B01-2014, Technical Standard of Highway Engineering
3 Terms and definitions
The following terms and definitions are applicable to this document.
3.1
collision warning
Information that the system gives to the driver indicating the need for urgent action to
avoid a collision.
No warning is performed in the FVCWS off state. It is optional to provide a driver-
selected means of placing FVCWS in this state, other than the Ignition key (for example:
on/off Switch).
Upon turning the ignition to the off position, the FVCWS transitions to the FVCWS off
state. Whenever the Self-Test function determines that the FVCWS is not able to deliver
adequate performance, a fault condition is set and FVCWS transitions to the FVCWS
off state.
● FVCWS standby (2)
No warning is performed in the FVCWS standby state. In this state, FVCWS monitors
the vehicle velocity and the gear position. If the subject vehicle velocity comes within
the FVCWS operating range and the gear select is in forward position (all gear positions
except reverse and park), the system transitions from the standby state to the active state.
FVCWS enters the FVCWS standby state from the FVCWS off state if the ignition
cycle has been completed and the engine is running, or if the engine is running and the
driver manually turns on the switch. If the subject vehicle velocity value is outside the
FVCWS operation range (hysteresis δ is added), reverse gear is selected, or park is
selected, FVCWS enters standby state from the active state.
● FVCWS active (3)
The warning is performed in the FVCWS active state whenever the warning conditions
are met. FVCWS enters this state if gear select is in any forward position and the vehicle
velocity value is in the FVCWS operation range.
4.3.3 Operational limits
The value of the minimum velocity Vmin shall be at most 11.2 m/s when the system
works. The value of the maximum velocity Vmax shall be at least 27.8 m/s or the
maximum vehicle operating velocity when the system works. The minimum value of
the relative velocity shall not be higher than 4.2 m/s, and the maximum value shall not
be lower than 20 m/s.
4.4 Warning functionality
4.4.1 Warning target object
Forward vehicle collision warning systems shall provide warnings for moving
(including “has been detected as moving by the sensor and now stopped”) obstacle
vehicles. Providing warnings for stationary obstacle vehicles is optional.
4.4.2 Monitoring distance and relative velocity between obstacle vehicle and
subject vehicle
A forward obstacle vehicle is sensed by obstacle detecting devices (such as optical radar,
radio wave radar, or image processing systems).
a) The collision warning shall include a visual warning and an audible and/or tactile
warning, wherein the tactile warning can be realized by means of seat belt
warning;
b) The preliminary collision warning shall include visual or auditory warning or a
combination of the two; a tactile form can be selected as a supplement;
c) If the driver of the subject vehicle is taking a braking operation, it is recommended
not to warn the driver in the form of braking warning;
d) If the subject vehicle is automatically applying the braking force, the collision
warning and preliminary collision warning can be taken in the form of braking
warning;
e) The duration of the braking warning shall not exceed 1 s; the resulting deceleration
shall not exceed 0.5 g; the range of vehicle velocity drop generated during the
warning process shall not exceed 2 m/s. At the same time, in order to ensure the
effectiveness of the braking warning, the average deceleration shall not be less
than 0.1 g, and the duration shall not be less than 100 ms;
f) Audible warning tone shall be selected such that it can be easily heard and
discriminated from warnings unrelated to forward direction threats (e.g., lateral
threat warnings).
4.5.3 Required deceleration threshold
The required deceleration thresholds involved in the forward vehicle collision warning
system shall meet the following requirements:
a) If the required deceleration areq exceeds its threshold range, the forward vehicle
collision warning system shall issue a collision warning; under dry road and warm
climate conditions, the areq threshold shall not exceed 0.68 g (taking into account
the response time value of 4.5.4);
b) If the timing of warning of the forward vehicle collision warning system can be
adjusted by the driver, at least one of the settings shall be able to meet the previous
threshold requirements for the required deceleration areq;
c) FVCWS may issue a preliminary collision warning at a lower required
deceleration.
d) The required deceleration threshold for collision warning and preliminary
collision warning may be adapted based on the detected road condition,
environmental and driver state conditions, driver behavior and different driving
scenarios.
4.5.4 Response time
The value of the response time involved in the forward vehicle collision warning system
shall meet the following requirements:
a) In the calculation of the warning range, the driver’s response time to the warning
Tresp shall be incorporated. The Tresp value shall not be less than 0.8 s;
b) The braking system response time Tb shall be incorporated in the calculation of
the required deceleration. The selection of the braking system response time value
is left to the FVCWS designer;
c) In case when automatic braking is applied in the subject vehicle, the driver’s
response time to warning Tresp and the braking system response time Tb may be
set to zero.
4.5.5 No Warning requirements
The FVCWS warning shall be suppressed or delayed under the following conditions:
a) The FVCWS shall not issue any type of warnings if the subject vehicle
deceleration is greater than or equal to the threshold of required deceleration areq.
b) The FVCWS shall not issue any type of warnings for a forward vehicle that is not
in the lane of the subject vehicle on roads with radius of curvature defined for
each class in Table 1;
c) It is recommended that that FVCWS does not issue any type of warnings for a
faster forward vehicle that cuts in front of the subject vehicle;
d) The FVCWS warning may be suppressed or delayed if the subject vehicle driver
is applying the brakes;
c) The FVCWS warning may be suppressed or delayed if the time to collision TTC
is greater than 4.0 s;
f) The FVCWS warning may be suppressed or delayed if the subject vehicle is
detected to be performing a lane change or high dynamic maneuvering, or if the
subject vehicle driver is overriding the automatic breaking by applying throttle,
or if an ACC maximum breaking warning is active;
g) The FVCWS warning may be suppressed or delayed if the situation is beyond the
operational limits as defined in 4.3.3.
4.5.6 Warning distance range calculation example
The minimum expected warning distance can be calculated using Formula (5). It can
be assumed that the driver's response time to warning is Tresp = 0.8 s, and the required
deceleration as defined in 3.22 is areq = 6.67 m/s2.
Appendix C
(Normative)
Sensor performance requirements and test target requirements
C.1 General
The forward vehicle collision warning system needs to obtain the information of the
forward vehicle (such as relative distance, relative velocity, etc.) through sensors. When
different sensors are used, certain safety performance requirements shall be met; for
systems using different types of sensors, there are also certain requirements for the test
target in performance test.
C.2 Safety performance of the sensor
C.2.1 Optical radar
The optical radar shall be in accordance with the provisions of the first class of lasers
in GB 7247.1-2012.
C.2.2 Radio wave radar
The radio wave radar shall comply with the regulations on vehicle ranging radar issued
by the Ministry of Industry and Information Technology [2005] No. 423 [3].
C.3 Test target requirements
C.3.1 Optical radar
C.3.1.1 The test target shall be determined according to the CTT (Test Target
Coefficient) representing the reflectivity of the vehicle. CTT shall be 2 m2/sr.
C.3.1.2 CTT describes the performance of the reflector. A corner reflector (reducing a
flat surface to a point) is required during testing. Large flat reflectors can also be used,
as long as their reflectivity does not exceed the value specified in C.3.1.1.
C.3.2 Radio wave radar
The test target is determined by the typical radar cross section (RCS) of the motor
vehicle. The RCS value is 3 m2.
Note: In actual use, it is difficult to obtain plane waves on scatterers. In actual use, the
radar cross-sectional area is determined by the measured value.
C.3.3 Visual sensor
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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