Usa sage of of CAN AN and C nd CAN AN-FD FD f for r Hi High - - PowerPoint PPT Presentation

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Usa sage of

• f CAN

AN and C nd CAN AN-FD FD f for r Hi High gh-De Defin initio tion Headli light Syste t Systems ms

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In Intr trodu

• duction
• n

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• Development of Light Sources:

− Candle − Gas burner (Acetylene) − Electric headlamp „Bosch Light“ − Bilux lamp − Halogen lamp − Xenon gas lamp − Led − Laser

Introduction

Robert Bosch GmbH Osram Licht AG

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• Main light distributions:
• Low beam with a kink in the light-dark

border

• Isolux diagrams:
• Bird‘s eye perspective
• f low beam:
• Bird‘s eye perspective
• f high beam:

Introduction

The Optical Society Hella KGaA Hueck & Co. ZKW Group GmbH

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Development of intelligent light functions

• Use of stepper motors for:

−

Beam height control

−

Curve light

−

Adaptive Front-lighting System (AFS)

• Camera based Advanced Driver Assistance System:

−

Adaptive cut-off line

−

Glare-free high beam (vertical cut-off line)

−

Matrix light

• Lead to higher safety on the road at night

Introduction

Hella KGaA Hueck & Co.

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Masked out region by Matrix Beam

Introduction

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Masked out persons by Matrix Beam

Introduction

Audi AG

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E/E /E-Arch rchitec itectu ture re

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Control of intelligent headlamps via CAN

E/E-Architecture

Headlight control via a general CAN bus Headlight control via a separate AFS- CAN bus

CiA-Presentation.pptx Gennady Benderman | EEK4

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Bus Bus-Load ad

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• CAN is a well-known and economical communication standard
• Calculation of the bus-load

[Bitsum] = bit [Cycletime] = s [Bitrate] = kbit/s

• Messages usually transmitted with cycle time tc1, at changes switch to faster tc2
• Stuffing bits

 additional increase of bus-load

Bus-Load

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• Advantages of CAN-FD:
• Longer data field of up to 64 Bytes
• Higher allowed data rate
• ISO-CAN-FD Frame with CRC bit stuffing counter
• The marked bits can transmitted with a higher CAN-FD specific bit rate

Bus-Load Fast Transmission

Holger Zellwanger; CAN FD verbessert; www.elektroniknet.de, 2015

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• Calculation of the average CAN-FD bitrate
• Calculation of the busload per message

[Bitsum] = bit [Cycletime] = s [Bitrate] = kbit/s

Bus-Load

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• Pixelwise transmission via 500kbit/s CAN
• Worst case bus load (incl. stuffing bits) at max. 50%
• Today’s exemplary bus load of the front-lighting CAN

Bus-Load 90 pixels, 6 bit CAN 500 kbit/s CAN-FD 2 Mbit/s CAN-FD 8 Mbit/s best case/ no bit stuffing 30.83 % 10.98 % 4.62 % best case/ with stuffing 36.37 % 12.96 % 5.45 % worst case/ no bit stuffing 38.33 % 15.03 % 6.49 % worst case/ bit stuffing 45.22 % 17.72 % 7.64 %

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Calculation of possible pixel number per headlamp

• Number of pixels per 64 Byte data frame for highest average data rate:
• Collecting of CAN messages in new CAN-FD messages

Bus-Load Bus Load <50% CAN-FD 2 Mbit/s CAN-FD 5 Mbit/s CAN-FD 8 Mbit/s Number of Pixels/HL ~1500 ~3500 ~4700

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Matrix Light

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• 90 pixel matrix (30 by 30)
• Overlap of neighbored segments
• Limited resolution
• verhead angle = open angle – object width

Matrix Light

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• Oncoming traffic relative speed of 200 km/h starting at 300 m

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• 1548 (86 by 18) pixel matrix with typical aspect ratio

Matrix Light

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• More relatively small switching steps of pixels by using a higher

horizontal resolution

• More comfortable for driver

Matrix Light

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• A smoother increase of switched off pixel by using a higher horizontal

resolution

Matrix Light

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• Reduction of the overhead angle by using a higher horizontal resolution

Matrix Light

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Alternative Pixel Control

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• Transfer of object information from a central Light ECU to the headlamp ECUs
• Data fusion in the Light ECU
• Calculation effort because of the parallax effect
• Object type, position, distance or object information for both coordinate systems
• Image processing in both headlamps

 computationally intensive tasks in the headlamp ECUs

Alternative Pixel Control

Sascha Saralajew; Berechnungen der Fehlstellungen eines Scheinwerfersys-tems, 2014

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Thank you!