Automotive on Board Electronic Network Architecture

8/3/2019 Automotive on Board Electronic Network Architecture

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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.

Documents

Automotive on Board Electronic Network Architecture