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

Usa sage of of 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 CiA-Presentation.pptx 1/26 Gennady Benderman | EEK4

In Intr trodu oduction on CiA-Presentation.pptx 2/26 Gennady Benderman | EEK4

• Development of Light Sources: − Candle − Gas burner (Acetylene) − Electric headlamp „Bosch Light“ − Bilux lamp − Halogen lamp − Xenon gas lamp − Led − Laser Robert Bosch GmbH Osram Licht AG CiA-Presentation.pptx Introduction 3/26 Gennady Benderman | EEK4

• Main light distributions:  Low beam with a kink in the light-dark border • Isolux diagrams:  Bird‘s eye perspective of low beam:  Bird‘s eye perspective of high beam: The Optical Society Hella KGaA Hueck & Co. ZKW Group GmbH CiA-Presentation.pptx Introduction 4/26 Gennady Benderman | EEK4

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 Hella KGaA Hueck & Co. CiA-Presentation.pptx Introduction 5/26 Gennady Benderman | EEK4

Masked out region by Matrix Beam CiA-Presentation.pptx Introduction 6/26 Gennady Benderman | EEK4

Masked out persons by Matrix Beam Audi AG CiA-Presentation.pptx Introduction 7/26 Gennady Benderman | EEK4

E/E /E-Arch rchitec itectu ture re CiA-Presentation.pptx 8/26 Gennady Benderman | EEK4

Control of intelligent headlamps via CAN Headlight control via a general Headlight control via a separate AFS- CAN bus CAN bus CiA-Presentation.pptx E/E-Architecture 9/26 Gennady Benderman | EEK4

CiA-Presentation.pptx E/E-Architecture 10/26 Gennady Benderman | EEK4

Bus Bus-Load ad CiA-Presentation.pptx 11/26 Gennady Benderman | EEK4

• 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 t c1 , at changes switch to faster t c2 • Stuffing bits  additional increase of bus-load CiA-Presentation.pptx Bus-Load 12/26 Gennady Benderman | EEK4

• 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 Fast Transmission Holger Zellwanger; CAN FD verbessert; www.elektroniknet.de, 2015 CiA-Presentation.pptx Bus-Load 13/26 Gennady Benderman | EEK4

• Calculation of the average CAN-FD bitrate • Calculation of the busload per message [Bitsum] = bit [Cycletime] = s [Bitrate] = kbit/s CiA-Presentation.pptx Bus-Load 14/26 Gennady Benderman | EEK4

• 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 CAN CAN-FD CAN-FD 90 pixels, 6 bit 500 kbit/s 2 Mbit/s 8 Mbit/s best case/ no bit 30.83 % 10.98 % 4.62 % stuffing best case/ with 36.37 % 12.96 % 5.45 % stuffing worst case/ no 38.33 % 15.03 % 6.49 % bit stuffing worst case/ bit 45.22 % 17.72 % 7.64 % stuffing CiA-Presentation.pptx Bus-Load 15/26 Gennady Benderman | EEK4

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 CAN-FD CAN-FD CAN-FD Bus Load <50% 2 Mbit/s 5 Mbit/s 8 Mbit/s Number of ~1500 ~3500 ~4700 Pixels/HL CiA-Presentation.pptx Bus-Load 16/26 Gennady Benderman | EEK4

Matrix Light CiA-Presentation.pptx 17/26 Gennady Benderman | EEK4

• 90 pixel matrix (30 by 30) • Overlap of neighbored segments • Limited resolution overhead angle = open angle – object width CiA-Presentation.pptx Matrix Light 18/26 Gennady Benderman | EEK4

• Oncoming traffic relative speed of 200 km/h starting at 300 m CiA-Presentation.pptx Matrix Light 19/26 Gennady Benderman | EEK4

• 1548 (86 by 18) pixel matrix with typical aspect ratio CiA-Presentation.pptx Matrix Light 20/26 Gennady Benderman | EEK4

• More relatively small switching steps of pixels by using a higher horizontal resolution  More comfortable for driver CiA-Presentation.pptx Matrix Light 21/26 Gennady Benderman | EEK4

• A smoother increase of switched off pixel by using a higher horizontal resolution CiA-Presentation.pptx Matrix Light 22/26 Gennady Benderman | EEK4

• Reduction of the overhead angle by using a higher horizontal resolution CiA-Presentation.pptx Matrix Light 23/26 Gennady Benderman | EEK4

Alternative Pixel Control CiA-Presentation.pptx 24/26 Gennady Benderman | EEK4

• 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 Sascha Saralajew; Berechnungen der Fehlstellungen eines Scheinwerfersys-tems, 2014 CiA-Presentation.pptx Alternative Pixel Control 25/26 Gennady Benderman | EEK4

Thank you! CiA-Presentation.pptx 26/26 Gennady Benderman | EEK4