The Fully Networked Car Geneva, 3-4 March 2010

1DEVELOPMENT OF OPEN-CORE FLEXRAY CONTROLLER FOR OEM ULTRA LOW COST AUTOMOTIVE APPLICATIONS

PRAMOD.V SUBRAT KARBHARTI SCHOOL OF TELECOMMUNICATION TECHNOLOGY AND MANAGEMENT,

INDIAN INSTITUTE OF TECHNOLOGY, DELHI

The Fully Networked Car Geneva, 3-4 March 2010

THE FUTURE CAR 2

Diagnostics

Engine

Transmission

More..

Gateway(Power train)

Radio

Mobile Phone

Infotainment

Video System

Gateway-2(Telematics)

Door Lock

Climate Control

Seat Control

More..

Gateway-3(Comfort)

Steer By Wire

Brake By Wire

More..

Gateway-4(Chassis)

Flexray Backbone

Flex

ray/

CA

N

MO

ST

CA

N

Flex

ray

The Fully Networked Car Geneva, 3-4 March 2010

A FLEXRAY NODE 3

Host Processor

Flexray Communication

Controller

Bus Driver

The Fully Networked Car Geneva, 3-4 March 2010

SMART FLEXRAY CONTROLLER 4

The Fully Networked Car Geneva, 3-4 March 2010

A SMART FLEXRAY CONTROLLER BASED ELECTRONIC CONTROL UNIT(ECU)

5

CSPPOCCHI

MAC

CO

DE

C

FSPProgramMemory

Hos

t Pro

cess

or

Bus

Dri

ver To

Flexray Bus

Programming Interface

I/O Interface

Flexray Controller I/O interface

PICOBLAZE+INTERFACE UNITFlexray Communication

Controller

FEATURES

o“On the fly” Programmable.

o1K of program memory.

oAccess to all Blocks of the Flexray Controller.

The Fully Networked Car Geneva, 3-4 March 2010

APPLICATIONS

o The applications most suited for the smart Flexray controller are:

1. Simple Applications: The ECU is generally used as simple control or a sensor node. Ex: Seat Control, Lighting Systems etc.

2. High End Applications: It involves multiple ECUs connected to a single powerful processor. Ex: Gateways, Diagnostic Unit etc.

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The Fully Networked Car Geneva, 3-4 March 2010

FLEXRAY BASED ANTI-LOCK BRAKING SYSTEM(ABS) 7

ECU-1

ECU-4

ECU-3

ECU-2

ECU-5

ABS Control Unit

Brake control

ECU-2

ABS Control Unit

The Fully Networked Car Geneva, 3-4 March 2010

FPGA BASED ON-BOARD MULTIFUNCTION SYSTEM 8

GPS Wi-Fi

ABS ESP Display

Transmission control

ValveTiming

S1

S5

S6S2

S3

S4S7

MOST to Flexray

CAN to FlexrayOn Board

Multi-Function System

Infotainment

Comfort Control

Flexray Bus A

Flexray Bus B

Flexray Bus C

Diagnostic/Safety Sensors FEATURES

oEach PicoBlaze core acts as a co-processor.oHost processor distributes tasks to each controller.oPicoBlaze core analyzes, filters and process the received Flexray frames.oHost processor interrupted only when a crucial decision is to be taken

The Fully Networked Car Geneva, 3-4 March 2010

KEY BENEFITS OF SMART FLEXRAY CONTROLLER

o Facilitates quick decisiono Reduce the time taken by the host processor in

accessing the Flexray controller.o Better content filtering with programmable parameters.o Can work without a host processor in simple

applications, hence reducing the overall cost.o Supports up to 1K of program memory allows a

decent sized application.o Gives more flexibility to the designer.

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The Fully Networked Car Geneva, 3-4 March 2010

CONCLUSION

o Vehicular networking will play a major role in the future automobile

o As a vehicular networking protocol, Flexray will ease implementations like “Steer by wire”, “Brake by wire” in future automobileso Open-source silicon will be to automobiles what open-source

is to software. Boundaries will end, monopolies will cease.o Smart Flexray controllers will help in managing the data

flow in a vast Flexray network and bringing down the cost per ECU

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The Fully Networked Car Geneva, 3-4 March 2010

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