3rd editionBrussels, Belgium

Transport Research Arena Europe 2010 7 – 10, June 2010

Requirements for data logging andexperiences with a data-logger in field trials

Francisco Sánchez/ David Sánchez/ Miguel Segovia / Marga Sáez / Julio Coira / María José González

CTAG

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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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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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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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Requirements for a logging systemMechanical 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 systemElectrical 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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Requirements for a logging systemFunctional 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 systemFunctional requirements – Other Requirements

� Functional Requirements (cont’d)� Data formats, uploading and analysis

� Non-propietary data storage format� Data integrity should be checked

� Vehicle bus data� Up to 4x CAN Channels are

requested� Capable to read .dbc files� Capability to send CAN messages� Capability to log data at full frame

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 least1 year with no maintenance

� Price� As competitive as possible!!!!

ECUECU

Vehicle CAN bus

OBD

connector

GPS & GPRS Antennasmultipurpose camera

radar

accelerometer

OR

Standard with vehicle

Mandatory part of the instrumentation (data)

Optional part of the instrumentation

ECUECU

data logger

ECUECUECUECU

Courtesy of CEESAR

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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 v2.0v1.0

� 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 operatingsystem (FreeRTOS)

� USB Stack

� This approach did not fulfilEuroFOT requirements

� Further development wasrequested

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Datalogger: from v1.0 to v2.0v2.0

� 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 v2.0v2.0

� CTAG’s 2nd generation DAS SW upgrades� Real time operating system withenhanced CAN driver

� New application processor based onLinux

� GPRS connection to Internet allowingdata synchronization and real time monitoring / tracking

� Script possibilities implemented (phyton)

� Possibility to work as HTTP, RSYNC andSSH server

� Firmware update through SD card orremote instructions

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Datalogger: from v1.0 to v2.0v2.0

CAN processor

CAN 1

Power

supply

12V / 24V

system

Serial

port

RTC & Battery

LEDs

CAN 2

CAN 3

CAN 4

Trigger

Application processor

GPS

SDHC USB

GPRS

Ignition

RAM FLASH

SIM

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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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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 systemincluding video logging andexternal 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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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 (phytonscript 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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Results

� Datalogger will be installed in German I VMC (CAN-Only) andin French VMC

� Pilot testing performed duringMay ’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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Conclusions

� CTAG’s Datalogger was selected to be the DAS in the CAN-only EuroFOT vehicles

� 2nd generation Datalogger was suscesfully addapted to EuroFOTrequirements

� 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