The document discusses the requirements and development of a data logging system for the EuroFOT field trial. It describes: 1) The EuroFOT challenge of collecting vehicle and driver behavior data from nearly 1,000 vehicles over 12 months. 2) The mechanical, electrical, and functional requirements for the data logging system, including size, power needs, data formats, and wireless capabilities. 3) The evolution of the CTAG datalogger from version 1.0 to 2.0 to meet EuroFOT's needs, such as adding 4 CAN channels, GPRS, and remote firmware updates. 4) Test results showing the version 2.0 datalogger met requirements and was selected

1. 3rd edition
Brussels, Belgium
Transport Research Arena Europe 2010 7 – 10, June 2010
Requirements for data logging and
experiences with a data-logger in field trials
Francisco Sánchez/ David Sánchez/ Miguel Segovia /
Marga Sáez / Julio Coira / María José González
CTAG
Index
1. Introduction: the EuroFOT challenge
2. Requirements for a logging system
3. Datalogger: from v1.0 to v2.0
4. Results
5. Conclusions
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2. Introduction
1. Introduction: the EuroFOT challenge
2. Requirements for a logging system
3. Datalogger: from v1.0 to v2.0
4. Results
5. Conclusions
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Introduction
EuroFOT Real testing in real conditions of
already available Driver Assistance Systems
Non-professional drivers
Almost 1.000 vehicles, 12 months ride
Vehicle’s data and individual driver
behaviour information will be collected and
analyzed:
Impacts of safety and efficiency?
Performance and capability of the systems?
Driver’s interaction?
Request for a reliable and effective data-
logging process
Results will support decision making to
deploy Driver Assistance Systems and will
raise awareness
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3. Introduction
Logging system:
CAN Data + Video + Extra Sensors
CAN Data + Video
CAN Data
CAN-only datalogging system
Naturalistic study
Remote data transmission
275 vehicles
German I VMC
French VMC (with additional video
and extra sensor logging)
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Requirements for a logging system
1. Introduction: the EuroFOT challenge
2. Requirements for a logging system
3. Datalogger: from v1.0 to v2.0
4. Results
5. Conclusions
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4. Requirements for a logging system
Mechanical Requirements
Mechanical requirements
Size and Weight
To be integrated in vehicle with no apparent
notice
As small and light as possible
To be integrated in a hidden area
Connectors and Interfaces
Lockable
PC Connection requested
Serial connection requested (integration of
external sensors & logging systems)
Noise
Fanless system (no noise accepted)
Encapsulation and temperature
-40 to +85ºC Storage
-20 to +65ºC operating
Vibration
Able to withstand normal vehicle environment
Encapsulation
Should stand the normal environment (dust,
moisture) in a vehicle environment
Crash
System should survive a minor crash
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Requirements for a logging system
Electrical Requirements
Electrical requirements
Power management
12 and 24 V compatible
System should not cause battery drain
in any case
Switch on should be mated to “ignition
on” signal
Switch off time should be configurable
System should switch off when battery
is below a certain threshold
Logging system will start operation
after an unexpected shut down
autonomously
Power consumption must be low
Electromagnetic emission and susceptibility
The system should not interfere with
vehicle electrical systems and vice-
versa
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5. Requirements for a logging system
Functional requirements
Functional Requirements
Configuration, debug and Software upgrade
Possibility to be remotely configured
System verification should be possible remotely
Status reports are requested (once a day / once
per driving cycle)
Data acquisition, time stamping and synchronization
GPS time synchronization
All possible signals should be synchronized in
the Data Acquisition System (1 ms resolution)
Configurable sample rates
Recording of data
Storage of only the selected signals
Pre-Trigger and Post-Trigger possibilities
Data storage and encryption
Possibility to encrypt and compress data
Data should not be overwritten
Wireless networks
GPRS / 3G capabilities
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Requirements for a logging system
Functional requirements – Other Requirements
Functional Requirements (cont’d)
Data formats, uploading and analysis GPS & GPRS Antennas multipurpose camera
Non-propietary data storage format OR
Data integrity should be checked data logger
accelerometer
Vehicle bus data ECU OBD ECU radar
connector
Up to 4x CAN Channels are
requested Vehicle CAN bus
ECU ECU
Capable to read .dbc files
Capability to send CAN messages Standard with vehicle
Mandatory part of the instrumentation (data)
Capability to log data at full frame Optional part of the instrumentation
Courtesy of CEESAR
rate from every channel
GPS
1Hz sample rate or higher
Start-up time
Minimum start-up time
Other requirements:
Reliability
System should work during at least
1 year with no maintenance
Price
As competitive as possible!!!!
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6. Datalogger: from v1.0 to v2.0
1. Introduction: the EuroFOT challenge
2. Requirements for a logging system
3. Datalogger: from v1.0 to v2.0
4. Results
5. Conclusions
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Datalogger: from v1.0 to v2.0
v1.0
CTAG’s 1st generation DAS
2 x CAN channels
Serial port communication
2 Gb SD Card
USB 2.0 full speed
External trigger input
Open source real time operating
system (FreeRTOS)
USB Stack
This approach did not fulfil
EuroFOT requirements
Further development was
requested
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7. Datalogger: from v1.0 to v2.0
v2.0
CTAG’s 2nd generation DAS HW upgrades
New architecture with 2 microcontrollers:
CAN microcontroller (4xCAN Channels)
Application microcontroller
GPRS and GPS Connection (XT65 from Siemens)
New operation modes
Ignition signal dependant power on
CAN activity dependant power on
Consumption reduction
<30 mA in sleeping mode
0 mA when ignition is off
Two power-in versions: 12 and 24 V
SD and SDHC compatibility
USB 2.0 high speed (up to 480 Mb) connection
New automotive compliant connectors
Configurable LED indicators
Serial port logging for video synchronization
SPI Connection availability for future upgrades
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Datalogger: from v1.0 to v2.0
v2.0
CTAG’s 2nd generation DAS SW upgrades
Real time operating system with
enhanced CAN driver
New application processor based on
Linux
GPRS connection to Internet allowing
data synchronization and real time
monitoring / tracking
Script possibilities implemented (phyton)
Possibility to work as HTTP, RSYNC and
SSH server
Firmware update through SD card or
remote instructions
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8. Datalogger: from v1.0 to v2.0
v2.0
12V / 24V
system
Ignition Trigger
Power RAM FLASH
supply
CAN 1
GPS
CAN 2
CAN processor Application processor GPRS
CAN 3
LEDs SIM
CAN 4
Serial RTC &
Battery SDHC USB
port
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Results
1. Introduction: the EuroFOT challenge
2. Requirements for a logging system
3. Datalogger: from v1.0 to v2.0
4. Results
5. Conclusions
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9. Results
CTAG’s Datalogger (v2.0) was
selected as the chosen device for
the CAN-only logging in EuroFOT.
Installation in 275 Vehicles
(German I VMC, French VMC)
175 passenger cars
100 trucks
Core element of a system
including video logging and
external sensors in French VMC (5
additional vehicles)
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Results
Final HW specs:
110 x 36 x 108 mm
274 gr (excluding cabling)
Fanless device
Dust and fluid testing (IP50), vibration
and temperature testing passed OK
Operating temperature: -30ºC to +70ºC
Storage temperature: -40ºC to +85ºC
EMC requirements met e-marked
23 mA consumption in stand-by mode
12 / 24 V operation successfully tested,
including power lose
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10. Results
Final SW Specs:
4 x CAN Channel logging, including
extended CAN
Added filtering options (extraction of
CAN signals from messages)
Configurable sampling filters
Data compression (33%)
Performance of diagnosis functionality
through CAN frames send-out (phyton
script enabled)
Data transmission through GPRS after a
certain time or at the end of the trip
Real time clock synchronized with GPS
data with 1ms resolution
Remote FW upgrade successfully tested
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Results
Main challenges:
Compatibility with GPRS data networks
Conection fading (GPS, GPRS)
GPS starting time
SD card reliability
Power-in stability when vehicle ignition
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11. Results
Datalogger will be installed in
German I VMC (CAN-Only) and
in French VMC
Pilot testing performed during
May ’10
Complete Data-Process testing
Start of FOT in June ’10
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Conclusions
1. Introduction: the EuroFOT challenge
2. Requirements for a logging system
3. Datalogger: from v1.0 to v2.0
4. Results
5. Conclusions
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12. Conclusions
CTAG’s Datalogger was selected
to be the DAS in the CAN-only
EuroFOT vehicles
2nd generation Datalogger was
suscesfully addapted to EuroFOT
requirements
Currently, FOT is about to begin
after piloting phase
Data acquisition
Data upload procedure
Data Storage
Success of the FOT will be closely
related with the right opperation of
the DAS
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Project coordinator:
Aria Etemad
FORD Research & Advanced Engineering Europe
Email: aetemad1@ford.com
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