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Presented by.
Bhupendra kharpuse
11AT61R08
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Trends of Automobile Electronic system
Electronic on Network ArchitectureCAN, LIN
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System on
Board Level
System on
Vehicle Level
System onTraffic
managementLevel
1995 2005
System
Road-map
POWERTRAIN
Engine and
Transmissioncontrol
SAFETY
MANAGEMENT
Stability controlBrake-by-wire
INFOTAINMENT
Intelligent
Transport system
COMFORT MANAGEMET
Driving
application
segment
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Analysts estimate that
more than 80 percent
all Automotive
innovation now stemsfrom Electronics.
To Embedded the
Electronic systems and
Silicon components
such as Transistors,Microprocessors, and
Diodesinto motor
vehicles is the
developing trend ofAutomotive Electronic
systems.
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CAN, LIN
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Open standard
Ease to use
Cost reduction
Improved Quality
Reliable
Availability of software on ECU
( Atmost 100% )
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Engine
control
Transmission
control
Antilock
Breaks
Auto
suspension
Dash-
Board
Air-
conditi
on
Air Bag
LightingPower
Lock
Power
seats
Power
window
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Engine
control
Transmission
control
Antilock
Breaks
Auto
suspension
Dash-
Board
Air-
conditi
on
Air Bag
LightingPower
Lock
Power
seats
Power
window
CAN CAN
CANCAN CAN CAN CAN
CAN CAN CAN
CAN
CAN
MultiMaster
Bus
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End
Listen to Bus
Transmit &
receive
Time delay
Abort
transmit
Send
Message
No
Yes
Yes
No
Bus Access procedureCSMA /CD:
Carrier
Sense
Multiple
Access with
Collision
Detection
access-control with non
destructive bit-widearbitration
if there is a collision , the
winner takes the bus
the message with higher
priority is not delayed ! real-time capability for high
prioritised messages
the lower the identifier, the
higher the priority
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Carrier sense multiple access with collision detection
(CSMA-CD)
C3 C4
C1 C2
Component
11010 11001
01100
00110
00110
--Smaller the
number higher thepriority.
-- We are not
wasting the time
in collision.
-- If tie is in b/wany two
component we
use id_no for
resolving to this.WIRED-AND
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CAN has following properties:
Prioritization of Message.
Configuration flexibility.
Multicast reception with Time synchronization.
System wide data consistency.
MultiMaster.
Error detection and signaling.
Support real time control at very high level security.
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There are four classes of CAN-systems in use :
o Class A: chassis electronics, e.g. mirror adjust, light & bulb control
10 KBPS ; 1 data transmission line , chassis used for ground
o Class B: distribution of information, e.g. central driver-display;
40 KBPS
o Class C: real-time information exchange in and between control-
loops e.g. engine-control( ignition, injection), brake-systems
(ABS, ASR); dynamic drive control, damping ; steering-control1MBPS
o Class D: network with large number of datas ( > 10KB/frame) , e.g.
radio, telephone, navigation-systems
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Application Layer
Upper level comm. functions of OSI model
Object Layer- Message filtering
- Message and Status Handling
Transfer Layer- Fault Confinement
- Error detection and Signalling
- Message Validation
- Acknowledgment
- Arbitration
- Message Framing
- Transfer Rate and Timing
Physical Layer- Signal Level and Bit Representation
- Transmission Medium
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SOF: One dominant bit is sent to indicate the starting of Data Frame.
Identifiers: Defines message priorities during arbitration.
CAN bus operates as an AND operator. RTR: The bit shows whether data is being sent to destination or the
destination node is requesting for data to source.
DLC: Indicates no. of bytes in data field.
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Data: It contains transmitting data.
CRC :
CRC Sequence: used for error detection and correction.
CRC Delimiter: CRC sequence is followed by CRC delimiterwhich consists of a single recessive bit.
ACK: It contains the ACK SLOT and ACK DELIMITER.- in both ACK fields the transmitter sends recessive bits
showing completion of transmission.
- receiver reports error free reception by sending a dominantbit during the ACK SLOT.
EOF : Each DATA FRAME is delimited by a sequence of sevenrecessive bit.
Interframe Space avoids the frame interference.
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Means: A single defective node can shut down entire Bus
network.
Solution: CAN automatically detect the faulty Node and
disconnect it from the network. CAN requires 2 Error counters:
for keep track of transmit Error (counter increment by 8)
for keep track of receive Error (increment by 9)
Based on Counter, Node can be in 3 states:
Error
Active
Error
Passive
Bus
Off
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Local interconnect network (LIN)
o A master-slave, time-triggered protocol
o As a low-speed (20kbps), single-wire
o LIN is meant to link to relatively higher-speed networks like CAN
o LIN reveals the security of serial networks in cars
o network is used in on-off devices such as car seats, door locks,
sunroofs, rain sensors, and door mirrors
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Multimedia
Consumer
Interface
Infotainment-
Control
Powertrain andVehicle Dynamics
Body
Electronics
Sub-Bus
X-by-wire
Safety Bus
Safety/Reliability
Data Rate
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FlexRay
CAN
LIN
MOST
Requirements 1 Mbits/s
20 Kbits/s
Media
oriented
system
Transport
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Todd H. Hubing, Clemson University International Center for
Automotive Electronics Clemson, SC 29634 USA.
Anders Rylander & Erik Wallin, Masters Thesis, Computer
Science and Engineering
,
CHALMERS
UNIVERS
ITY OFTECHNOLOGY, Department of Computer Engineering
Gteborg 2003.
Pyungsun Park, Hongbin Yim, Heeseok Moon, Jaeil Jung,
Multimedia Networking Laboratory, Dept. of Electrical &
Computer Engineering , Hanyang University, Seoul, Korea,
133-791.
Automotive Electronics Magazine, August-September 2011.
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