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GB 39732-2020: Vehicle event data recorder system
GB 39732-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.10
T 36
Vehicle event data recorder system
ISSUED ON: DECEMBER 24, 2020
IMPLEMENTED ON: JANUARY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions... 5 
4 Technical requirements ... 9 
5 Test methods and requirements ... 23 
6 Appearance and marking ... 27 
7 Extension of vehicle models ... 27 
8 Instruction manual ... 28 
9 Implementation of standard ... 29 
Appendix A (Normative) Data element format ... 30 
Appendix B (Normative) Arrangement of data elements ... 34 
Appendix C (Normative) Determination of compliance of delta-V curve ... 48 
Appendix D (Normative) Shock waveform of bench test ... 50 
Vehicle event data recorder system
1 Scope
This standard specifies the terms and definitions, technical requirements, test methods
and requirements, appearance and marking, vehicle type extensions and instructions,
for the vehicle event data recorder system of category M1 vehicles.
This standard applies to category M1 vehicles, which are equipped with a vehicle event
data recorder system. Other vehicles can make reference with it.
2 Normative references
The following documents are essential for the application of this document. For dated
references, only the dated version applies to this document. For undated references, the
latest edition (including all amendments) applies to this document.
GB 11551-2014 The protection of the occupants in the event of a frontal impact for
motor vehicle
GB 14166 Safety-belts, restraint systems, child restraint systems and ISOFIX child
restraint systems for occupants of power-driven vehicles
GB 20071 The protection of the occupants in the event of a lateral impact
GB/T 20913 The protection of the occupants in the event of an off-set frontal impact
for passenger car
GB/T 30038 Road vehicles - Degrees of protection (IP-Code) - Protection of
electrical equipment against foreign objects, water and access
GB/T 34589-2017 Road vehicles - Diagnostic connector
ISO 14229-1:2020 Road vehicles - Unified diagnostic services (UDS) - Part 1:
Application layer
ISO 14230-1 Road vehicles - Diagnostic communication over K-Line (DoK-Line) -
Part 1: Physical layer
ISO 14230-2 Road vehicles - Diagnostic communication over K-Line (DoK-Line) -
Part 2: Datalink layer
ISO 14230-3:1999 Road vehicles - Diagnostic systems - Keyword Protocol 2000 -
Part 3: Application layer
ISO15765-2:2016 Road vehicles - Diagnostic communication over Controller Area
Network (DoCAN) - Part 2: Transport protocol and network layer services
3 Terms and definitions
The terms and definitions, as defined in GB 14166, as well as the following terms and
definitions, apply to this document.
3.1
Impact event
A impact or other physical event, that reaches or exceeds the trigger threshold, OR
any other event, that causes an irreversible restraint to deploy, whichever occurs first.
3.2
Vehicle event data recorder system; EDR
A device or system, which is composed of one or more on-board electronic modules;
has the function of monitoring, collecting, recording the data of the vehicle and
occupant protection system before, during, after the occurrence of an impact event.
3.3
EDR controller
In-vehicle electronic module, for monitoring, collecting, recording time-series data,
during an impact event.
3.4
Lateral acceleration
The component of the acceleration vector, at a point on the vehicle, in the direction
of the Y axis.
Note: When the driver sits in the car and faces the driving direction of the vehicle, from left
to right, from the driver's point of view, is the positive direction of lateral acceleration, as
shown in Figure 1.
extraction tools.
3.19
EDR record report
A human-readable report, which contains vehicle EDR records, as translated and
output by the EDR data extraction tool.
3.20
Control upper limits; UCL
A limit, which is used to define the compliance test of a variable.
3.21
Lower control limits; LCL
A limit, which is used to define the compliance test of a variable.
4 Technical requirements
4.1 Requirements for impact event
4.1.1 Trigger threshold
4.1.1.1 The event shall be recorded, when the vehicle reaches the following trigger
threshold conditions:
- When the vehicle only records "longitudinal delta-V", the trigger threshold is the
vehicle speed change of not less than 8 km/h, within a 150 ms time interval in the
X-axis direction;
- When the vehicle records "lateral delta-V" at the same time, the trigger threshold
is a vehicle speed change of not less than 8 km/h, within a 150 ms time interval in
the X-axis direction or the Y-axis direction.
4.1.1.2 For the above two cases, if the event duration is less than 150 ms AND the
vehicle speed change is not less than 8 km/h, the trigger threshold is reached.
4.1.1.3 When the manufacturer sets other trigger thresholds, it shall also meet the
requirements of 4.1.1.1 and 4.1.1.2.
4.1.2 Lockout conditions
4.1.2.1 The EDR system shall select at least one of the following, as the locking
condition; the event data shall not be overwritten by subsequent events:
- The deployment of the irreversible restraint device;
- The vehicle speed change in the X-axis direction, within the time interval of 150
ms, shall not be less than 25 km/h.
4.1.2.2 When a back-impact occurs, the manufacturer can use the control algorithm,
which is set by itself, as the lockout condition. In the event of a side impact, the
deployment of side irreversible restraint device shall be used as the lockout condition.
If the vehicle is not equipped with a side irreversible restraint device, the vehicle
manufacturer shall determine whether to lock it.
4.1.2.3 When the manufacturer sets other locking conditions, it shall also meet the
requirements of 4.1.2.1 and 4.1.2.2.
4.1.3 Starting point of impact event
The starting point of the impact event (time zero T0) shall meet any of the following
requirements, as shown in Figure 2:
a) For systems using the "wake up" occupant protection control algorithm, T0 is the
moment when the occupant protection control algorithm is activated.
b) For the system using the "continuous operation" occupant protection control
algorithm, T0 is the earliest time, when the longitudinal cumulative delta-V is not
less than 0.8 km/h, within the 20 ms time interval of the front impact/rear impact
event; OR it is the earliest time, when lateral cumulative delta-V is not less than
0.8 km/h, within the 5 ms time interval of the side impact event, as shown in Table
1.
c) The initial moment of deployment of an irreversible restraint device.
d) If the EDR function is not implemented by the airbag controller, then b) shall be
used as the starting point of the impact event.
e) The secondary (or higher) burst of the airbag shall not be used as the starting point
of the impact event, nor shall it trigger another EDR record.
f) If c) is used as the starting point of the impact event, then the impact event data,
before the deployment of the irreversible restraint device, shall also be collected
and recorded.
Note: "Wake up" occupant protection control algorithm means that the occupant protection
control algorithm starts to run, after meeting certain ...