Laboratoire d' Intégration des Systèmes et des Technologies Fabrice AUZANNEAU...
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Transcript of Laboratoire d' Intégration des Systèmes et des Technologies Fabrice AUZANNEAU...
Laboratoire d' Intégration des Systèmes et des Technologies
Fabrice [email protected]
01 69 08 90 70
Embarked diagnosis for wired harnesses of
complex topology at CEA LIST
Laboratoire d' Intégration des Systèmes et des Technologies
Electronics in transports
Electronics in a modern car is more expensive than the steel used to make it, and top-of-the-range models can contain more than 100 CPUs. Most of the innovations in current cars come from electronics. Electronics currently represents nearly 25% of the cost of a vehicle, and this will double before 2010, involving the creation of more than 600.000 employment in Europe only in this sector.
Statistically, electronics alone is responsible for 35% of cars’ failures
Laboratoire d' Intégration des Systèmes et des Technologies
Cumulated cable lengths
QUEEN MARY 2MODERN CAR CIVIL PLANE
km
101 1000100 100004
40 200 1200
2500400
BUS
HELICOPTER
FPSO (Floating Production, Storage and Offloading unit)
MODERN FIGHTER HIGH SPEED TRAIN
1km / m
5 km / m
8 km / m
A CABLE DEFECT IS OFTEN MISTAKEN TO BE AN ELECTRONIC DEFECT
Laboratoire d' Intégration des Systèmes et des Technologies
Reliability and harness diagnosis
Diagnosis systems already exist in modern cars for ECUs (Built-in test systems) – ECU health monitoring
– Sometimes, they provide information on the communication bus health
Today there exists no such diagnosis system for the cable harness– The harness is a system on its own information transfer, energy supply
– Maintenance can be very hard• Today, a mechanic can spend 2 days to isolate and repair a cable defect,
sometimes after having changed healthy and costly equipments…
– Harness maintenance is expensive : immobilization time + defect search time
70% of ECU returned to manufacturers are diagnosed free from defects
There is a real need for a tool able to tell if the harness is healthy and precisely locate a defect
Laboratoire d' Intégration des Systèmes et des Technologies
Reflectometry
TDR – time domain reflectometry : an active diagnosis method1. Sending a probe signal down the network 2. During its propagation, part of its energy is
reflected back by electrical discontinuities (defects, branches, loads…)
3. Reflected signal analysis provides information about the network’s health
High localization accuracy (few % of the length)– But dispersion, attenuation, sampling,
digitization can alter accuracyCan detect multiple defectsMay require complex electronics
Ligne de 100 mètres
attenuation
dispersion
DETECTION – LOCALIZATION – CHARACTERIZATION OF DEFECTS
Laboratoire d' Intégration des Systèmes et des Technologies
The SEEDS project
Financed by ANR, the SEEDS project aims at proving the feasibility of a harness diagnosis system for automotive applications– Smart Embedded Electronic Diagnosis System
7 partners : the complete chain from upstream research to end-user, via technology providers– CEA LIST, INRIA, SUPELEC LGEP– DELPHI, RENAULT TRUCKS, SERMA, MONDITECH
Objectives :
– Understand and model the physics of RF signals propagation in automotive / trucks harness cables
– Identify and simulate a diagnosis method for cables and connectors – Study, design and prototype a harness diagnosis system for road
vehicles
2006 2009
PROVE THE FEASIBILITY OF A HARNESS DIAGNOSIS SYSTEM FOR AUTOMOTIVE APPLICATIONS
Laboratoire d' Intégration des Systèmes et des Technologies
FPGA prototyping
Signal generation, Injection, Acquisition + Identification et Localization of the defect.
Tested and validated first in laboratory conditions.
Laboratoire d' Intégration des Systèmes et des Technologies
Tests in real conditions
TH
EN
ON
RE
AL
HA
RN
ES
SE
S I
N A
CA
R
Laboratoire d' Intégration des Systèmes et des Technologies
Tests in real conditions
PDA – MAN MACHINE INTERFACE
SUPPLY CABLES SIGNAL CABLES
SIGNAL GENERATION
… A
ND
IN
A T
RU
CK
Laboratoire d' Intégration des Systèmes et des Technologies
From external to embedded diagnosis
EMBARKED DIAGNOSISEMBARKED DIAGNOSIS
DISTRIBUTED DIAGNOSIS DISTRIBUTED DIAGNOSIS ARCHITECTUREARCHITECTURE
SIMPLER SIGNAL PROCESSING
NEEDS MUCH LESS NEEDS MUCH LESS COMPUTING POWERCOMPUTING POWER
OBJECTIVE :DIAGNOSIS
INTEGRATION
SIMPLE NETWORK TOPOLOGY
DIAGNO CHIP
ADDITIONAL STRUCTURES TO
SIMPLIFY FURTHER
EXTERNAL DIAGNOSIS
COMPLEX NETWORK TOPOLOGY
COMPLEX SIGNAL PROCESSING
CAN RUN ON A PC
NEEDS COMPUTING POWER
Laboratoire d' Intégration des Systèmes et des Technologies
Embedded harness diagnosis
Operational constraints– The diagnosis must not interfere with the system
– Diagnosis architecture must be considered– Diagnosis strategy
• Improve localization accuracy a few centimeters
– Microelectronic integration
Compliance to standards– EMC, etc
Cost– As close as possible to … zero
Embedding harness diagnosis inside the vehicle requires new paradigms
A new diagnosis method is required
Laboratoire d' Intégration des Systèmes et des Technologies
SIGNAL GENERATION
LINE COUPLINGMODULATION
s(t) x(t)
SIGNAL EMISSION
LINE COUPLINGDEMODULATIONFILTERING
xs(t)y(t)SIGNAL DETECTION
SIGNAL FORMATTING
DATA PROCESSING
DATA ANALYSIS
DATA PROCESSING
DEFECTDETECTION +
LOCALIZATION,NETWORK TOPOLOGY
Reflectometry principles
Laboratoire d' Intégration des Systèmes et des Technologies
S T
A new method : STDR principles
From the processing and analysis of time domain signals, one can deduce the localization and type of the defect.
Binary pseudo noise sequence with sharp auto-correlation peak
The signal propagates along the line and comes back time-shifted
by two times the defect’s distance
Defect Probe signal
Reflected signal
Laboratoire d' Intégration des Systèmes et des Technologies
Distribution : Better diagnosis coverage Reduce data complexity No more localization ambiguity More efficient and reliable diagnosis
Distributed reflectometry principles
DiagnosticD
iag
no
stic
TRAITEMENT
GÉNÉRATION ACQUISITION
Diagnostic filaire
Flexray
ECUengine
µP
Mem
ory
SoC
Asic1
Asic2
Glue
Glue
µC
Mem
ory
IPCore2
Glue
IPCore1
CAN
Body control module
CAN
Driver doormodule
CAN
Airbag
CAN
Passenger door module
Flexray
Yaw rate sensor
Flexray
Electronic stability program
Flexray
Electro-hydraulic
powersteering
Flexray
Automatic headlamp
control
Flexray
Automatic transmission
control
CAN
Underhoodelectronics
CAN
Instrument panel cluster
CAN
Rear electronics
central module
CAN
Parking assistant
CAN
Displays
CAN
Auxiliaryheater
CAN
Sun roof module
CAN
Interface
Flexray
Flexray
ECUengine
µP
Mem
ory
SoC
Asic1
Asic2
Glue
Glue
µC
Mem
ory
IPCore2
Glue
IPCore1
CAN
Body control module
CAN
Driver doormodule
CAN
Airbag
CAN
Passenger door module
Flexray
Yaw rate sensor
Flexray
Electronic stability program
Flexray
Electro-hydraulic
powersteering
Flexray
Automatic headlamp
control
Flexray
Automatic transmission
control
CAN
Underhoodelectronics
CAN
Instrument panel cluster
CAN
Rear electronics
central module
CAN
Parking assistant
CAN
Displays
CAN
Auxiliaryheater
CAN
Sun roof module
CAN
Interface
Flexray
Automotive application example
Laboratoire d' Intégration des Systèmes et des Technologies
Diagnosis roadmap for automotive applications
2004 2006 2008 2010 2012
Dia
gn
osi
s sy
stem
s
Diagnosis as part of design
constraints
Cop. ACTIA
AUTOMOTIVEDistributed diagnosis
(multiplexing)
External diagnosis systems
Wired network
diagnosis
CALCULATORS
ENTIRE NETWORK
ENTIRE NETWORK, DISTRIBUTED DIAG.
ENTIRE NETWORK, INTEGRATED DISTRIBUTED DIAG.
Systems are dynamically
diagnosed and reconfigured
Laboratoire d' Intégration des Systèmes et des Technologies
Conclusions and perspectives
The feasibility of an external harness diagnosis system is proven – its interest was demonstrated for garage application
Validation in real life conditions has shown its robustness. – Robustness to parasitic signals (CAN bus validation) and to test
cases variations
Embedding the diagnosis system in the vehicle is currently under study– Active fault tolerance “Smart Interconnect”
Numerous other application domains are identified – transports, energy, telecommunication, infrastructures and building…– Generic technologies and upstream research will be transferred
Laboratoire d' Intégration des Systèmes et des Technologies
THANK YOU FOR YOUR ATTENTION