JT/T 1242-2019 PDF English
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Performance requirements and test procedures for advanced emergency braking system of commercial vehicle
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JT/T 1242-2019: Performance requirements and test procedures for advanced emergency braking system of commercial vehicle
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JTT1242-2019
TRANSPORTATION INDUSTRY STANDARD
ICS 03.220.20; 43.040.80
T 35
Registration number.
Performance requirements and test procedures for
advanced emergency braking system of commercial
vehicle
Issued on. MARCH 15, 2019
Implemented on. APRIL 01, 2019
Issued by. Ministry of transport of PRC
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions, abbreviations... 5
4 General requirements... 8
5 Function requirements... 10
6 Environmental adaptability requirements... 13
7 Test procedures... 14
References... 24
1 Scope
This standard specifies the general requirements, functional requirements,
environmental adaptability requirements, test procedures for advanced
emergency braking systems of commercial vehicles.
The standard applies to advanced emergency braking systems installed on
commercial vehicles, where the test procedures are applicable to the normative
testing of advanced emergency braking systems in a closed field test
environment.
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/T 19951-2005 Road vehicles - Test methods for electrical disturbances
from electrostatic discharge
GB/T 21437.2-2008 Road vehicles - Electrical disturbances from conduction
and coupling - Part 2.Electrical transient conduction along supply lines only
GB/T 21437.3-2012 Road vehicles - Electrical disturbances from conduction
and coupling - Part 3.Electrical transient transmission by capacitive and
inductive coupling via lines other than supply lines
GB/T 28046.1-2011 Road vehicles - Environmental conditions and testing
for electrical and electronic equipment - Part 1.General
GB/T 28046.2-2011 Road vehicles - Environmental conditions and testing
for electrical and electronic equipment - Part 2.Electrical load
GB/T 28046.3-2011 Road vehicles - Environmental conditions and testing
for electrical and electronic equipment - Part 3.Mechanical load
JT/T 794 GNSS system for operating vehicles - Technical specification for
vehicle terminals
3 Terms and definitions, abbreviations
3.1 Terms and definitions
The following terms and definitions apply to this document.
3.1.1 Advanced emergency braking system
A system which automatically detect target vehicles or obstacles, detect
potential forward collision hazards, issue early warning signals to alert the
driver, activate the vehicle's brake system, reduce the speed to avoid or
mitigate collision.
3.1.2
Subject vehicle
A vehicle equipped with an advanced emergency braking system as defined
in this standard.
3.1.3
Forward vehicle
A vehicle located in front of the subject vehicle.
3.1.4
Target vehicle
On the trajectory line in front of the subject vehicle, the forward vehicle which
is closest to the subject vehicle. It is the object of the advanced emergency
braking system.
3.1.5
Collision warning
The AEBS alerts the driver of a collision hazard.
3.1.6
Visibility
The length of path as travelled by the non-diffused light emitted by an
incandescent lamp which has a color temperature of 2700 K when its
illuminance is reduced to 5% of the initial value.
[GB/T 33577-2017, definition 3.14]
4 General requirements
4.1 AEBS composition
The AEBS shall include an environment awareness module, a control decision
module, a bottom-layer execution module, a human-machine interaction
module, a data communication interface. It may include a data storage module
and a wireless communication module, the above modules are not limited to
independent or integrated forms.
4.2 AEBS classification
According to the functions available, AEBS is divided into two categories, as
shown in Table 1.Each row represents a different system type. The collision
warning in the Table shall meet the requirements of 5.3.The emergency braking
shall comply with the requirements of 5.4.
4.3 AEBS-adapted vehicle
AEBS shall be installed on commercial vehicles which are equipped with an
anti-lock brake, an electronic stability control system, disc brakes on all wheels.
4.4 Target obstacle type
Target obstacles that AEBS can detect shall include motor vehicles and
pedestrians traveling on public roads.
4.6 Driver control and human-machine interface
The AEBS shall provide the driver with a human-machine interface to interact
with the driver. Provides warning information including at least two of audible,
visual, or tactile, braking information, operation, cessation, or fault state
information of the AEBS. The displayed information shall be clearly displayed
in direct sunlight and at night.
4.11 Data backup
4.11.1 For AEBS trigger event data, it shall perform local data backup and
remote data backup. The most recent storage time for local data backup shall
be not less than 48 h; the remote storage time shall be not less than 60 d.
4.11.2 AEBS trigger event data shall include at least the following information.
4.12 Installation and use requirements
The AEBS system shall be installed and used in accordance with the
manufacturer's instructions for use, including AEBS calibration, minimum
starting speed, and applicable and non-applicable conditions.
5 Function requirements
5.1 Running speed
The AEBS shall operate normally at least within the range from a running speed
of 15 km/h to the maximum design speed under all load states of the vehicle.
5.2 Target detection area
5.2.1 The minimum detection distance of AEBS shall be not more than 2 m. The
maximum detection distance to the target vehicle shall be not less than 150 m.
The maximum detection distance to the pedestrians shall be not less than 60
m.
5.2.3 AEBS shall be capable of detecting the target vehicle on a bend which
has a radius of curvature not more than 250 m.
5.3 Collision warning
5.3.1 Warning time
If the TTC or ETTC is more than 4.4 s, the AEBS shall not issue a collision
warning.
5.3.2 Warning mode
When the AEBS detects a possible collision with a forward vehicle or pedestrian,
it shall be able to output an alarm of not less than two different levels. The level-
1 collision warnings shall be generated 1.4 s before the emergency braking
phase. The level-2 collision warnings shall be generated 0.8 s before the
emergency braking phase.
5.3.3 Speed reduction in the warning phase
In the warning phase, any speed reduction of the subject vehicle shall not
exceed 15 km/h or 30% of total deceleration, whichever is larger.
5.4 Emergency braking
5.4.1 Start of emergency braking
The emergency braking phase shall not begin before the TTC or ETTC is more
than or equal to 3 s.
5.4.2 Minimum speed reduction in emergency braking
5.5 In-vehicle communication
The AEBS shall be able to extract the required information from the in-vehicle
communication network. The information provided by the in-vehicle
communication network includes at least the speed information, the brake, the
throttle, the turn signals.
5.6 Vehicle-road communication
5.6.1 Type II AEBS shall have the vehicle-road communication function of
wireless mobile communication technology, to realize the interaction with the
execution data of roadside unit.
5.6.4 The wireless mobile communication interface of the type II AEBS shall
support both cellular access communication mode and direct connection
communication mode. The two communication modes shall adopt the same
network system.
5.6.5 The wireless communication technology as used in type II AEBS shall
comply with the provisions of JT/T 794.
5.6.6 The maximum air interface time delay of the direct connection
communication mode of the type II AEBS not exceed 20 ms.
5.6.7 The communication distance between the subject vehicle and the
roadside unit shall be not less than 200 m.
6 Environmental adaptability requirements
6.1 Electrical environment adaptability
6.1.1 Working voltage range
The working power supply of AEBS shall be the vehicle DC power supply. The
working voltage range shall meet the requirements of Table 3.
6.1.2 Overvoltage performance
The overvoltage performance of AEBS shall comply with the requirements of
4.3 of GB/T 28046.2-2011.
6.1.3 Reverse voltage performance
The reverse voltage performance of AEBS shall comply with the requirements
of 4.7.2.3 of GB/T 28046.2- 2011.
6.1.4 Climate environment adaptability
The AEBS shall be able to adapt to a storage temperature of at least -40 ��C ~
85 ��C and a working temperature of at least - 30 ��C ~ 70 ��C.
6.2 Mechanical environment adaptability
6.2.1 Vibration
The mechanical vibration resistance of AEBS shall comply with the
requirements of 4.1 of GB/T 28046.3-2011.
6.2.2 Impact
The mechanical impact resistance of AEBS shall comply with the requirements
of 4.2 of GB/T 28046.3-2011 according to the installation position of AEBS.
6.3 Electromagnetic environment adaptability
7 Test procedures
7.1 Test target
The target for the test shall be the category M1 passenger car and pedestrian
model. Alternatively, it may also use a flexible target vehicle with
characterization parameters representative of the above vehicle and adapted
to the AEBS sensor.
7.2 Environmental conditions
The test shall be carried out on a level and dry concrete, asphalt pavement
which has good adhesion. The horizontal visibility shall be more than 1 km.
The range of test ambient temperature shall be - 20 ��C ~ 45 ��C. The ambient
wind speed shall be less than 5 m/s.
7.3 Vehicle conditions
During the entire course of test, the subject vehicle shall be fully loaded.
7.4 Test of advanced emergency braking system
7.4.1 Test of target detection distance
7.4.2 Test of target detection width
7.4.2.1 Test procedure
The target vehicle is stationary, in the direction same as the subject vehicle.
Before the arrival test is started, the subject vehicle is located at the center line
of the lane. Respectively locate the target vehicle at the leftmost and rightmost
sides of the lane. The direction of the head of the vehicle shall be consistent
with that of the subject vehicle.
of the lane, to perform 1 test each.
7.4.3 Target vehicle stationary test
7.4.3.1 Test procedure
The target vehicle is stationary, in the same direction with the subject vehicle.
When the subject vehicle drives at a speed of 80 km/h and 40 km/h, at a
distance of 150 m from the target vehicle, the test starts. The driver maintains
the position of accelerator pedal and maintains the vehicle speed. When the
subject vehicle collides with the target vehicle or avoids collision, the test is over.
The test procedure is as shown in Figure 4.
7.4.3.2 Test validity requirements
The test validity is subject to the following rules.
7.4.4 Target vehicle movement test
7.4.4.1 Test procedure
The target vehicle and the subject vehicle are in the same direction. During the
test, the subject vehicle is kept at a speed of 80 km/h and traveled straight along
the centerline of the lane. The target vehicle runs straightly at a speed of 12
km/h along the centerline of the lane. When the distance between the subject
vehicle and the target vehicle is equal to 150 m, the test starts. The driver
maintains the accelerator pedal's position to maintain the vehicle speed. The
test procedure is as shown in Figure 5.
7.4.5 Test bend and target identification performance test
7.4.5.1 Test procedures
The test is carried out along a bend which has a radius of 250 m or 150 m.
When the bend's radius is 250 m, the subject vehicle, the forward vehicle in the
adjacent lane, the target vehicle run in the same direction at a speed of not less
than 50 km/h. When the bend's radius is 150 m, the subject vehicle, the forward
vehicle in the adjacent lane, the target vehicle run in the same direction at a
speed of not less than 40 km/h. The test procedure is as shown in Figure 6.
Legend.
7.5 Remote data backup
7.5.1 Ensure that there is wireless network coverage on the test road around
the test site. The remote server required for the test establishes a connection
with the AEBS of the vehicle. When performing the test items involved in 7.4.3
~ 7.4.8, the subject vehicle shall send the backup data to the remote server in
real time.
7.5.2 The test validity shall comply with the corresponding requirements of 7.4.3
~ 7.4.8.
7.5.3 In all validity tests, the information in the remote server backup data shall
be identical to the AEBS related information as monitored in the field.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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