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Transcript
Automotive Applications of Display Systems and Human-Machine Interfaces using a Dash-Mounted Touch Screen Computer April 29, 2010 Assim Addous Sam Coogan Santiago Hässig Martin Perry Dash-Mounted Automotive HMI EcoCAT Overview • Automotive Human-Machine Interface (AHMI) to display vehicle information to driver • Modern vehicles contain wealth of disparate data • OEMs and car enthusiasts seek a consolidating interface • Must be below $1,200 to be competitively priced as vehicle upgrade package Design Objectives Real-time data Proposed Fuel efficiency Actual GPS Motor and engine operating points Motor and engine operating points Emissions composition 2-mode transmissions status Diagnostic Historical data data Battery SOC Projected mileage on current drive GPS tracing cycle Fuel saved Speed history Low fuel Oil pressure and temperature Engine overheating Battery temperature Vehicle Panel Engine Panel 2-Mode Panel Electric Panel GPS Panel Video Demonstration Packaging Hardware Overview CAN Controller reads in signals from HUB HMI Computer parses USB data Hardware Selection Custom Built CAN Hub •6 DB-9 ports •Vehicle cockpit •Cargo area NI USB CAN Controller •1 DB-9 Port •Highspeed CAN •500 kBaud Lenovo Desktop •Windows XP Home Xenarc 705TS •x86 Architecture •7.5” display •LabVIEW compatible •4-wire, USB touch interface •6 USB ports •High viewing angle •Antiglare •800x480 resolution CAN-bus Topology Software Development • LabVIEW Designed – Uses Virtual Instruments (VI) library for CAN messages – Frame to channel conversion library – Easy to add new signals • Compiled to standalone executable • Executable run as OS shell Acceptance Testing • Packaged within dash of vehicle • Demoed in vehicle using previouslyobtained data • Signals replayed by vehicle controller – Data from vehicle run in December – Transparent to AHMI – Displayed data values compared to known values to ensure accurate display Power Handling • Power on – Power applied when ignition moves to accessory – Computer BIOS adjusted to boot when power is applied – Executable runs on OS startup • Power off – Soft power off switch on display – Handled by driver before car shutdown – Not ideal, but simple and intuitive • Power integrity – Will not experience power or voltage spikes Computer Power • Computer board uses 19V • Voltage detection on computer prevents lower voltage • Uses DC-AC inverter and original AC-DC adapter to power PC Prototype Cost Component List Price Actual Cost Can Controller $399 $300 HMI Computer $199 $199 VGA Touchscreen $279 $0 DC-AC Inverter $30 $30 GT CAN Hubs $30 $0 $5090 $0 $95 $0 $6122 $429 NI LabVIEW Professional Windows XP License Total Prototype Labor Labor Category Time Spent Cost CAN Bus configuration 32 $3,840 LabVIEW development 50 $6,000 OS configuration 24 $2,880 Hardware integration 40 $4,800 Vehicle installation 25 $3,000 Total Labor Costs 171 $20,520 Hardware Cost Total Costs $6,122 $26,642 We assume an engineer making $40 per hour, with a 3x multiplier to cover benefits, overhead, etc., resulting in $120 per hour. Costs for 10,000 Units Component Cost per Unit # of Units Total Cost Can Controller $399 10,000 $3.9M HMI Computer $199 10,000 $1.9M VGA Touchscreen $279 10,000 $2.8M DC-AC Inverter $30 10,000 $0.3M GT CAN Hubs $30 10,000 $0.3M $5090 1 $5090 $95 10,000 $1.0M $8,580 1 $20,520 NI LabVIEW Professional Windows XP License Development Labor Total $10.2M Per Unit Cost $1,023 Future Work • Power off initiated by vehicle power off – Requires custom power circuitry • Embedded operating system – More lightweight for minimal hardware – Quicker boot and shutdown – Cheaper licensing and manufacturing for large scale implementation • Map database • Direct DC power to computer Temperature Control • Vehicle interior can reach temperatures of up to 120°F • Have not observed any negative effects • If implement large scale, hardware would likely not cause issue • As a prototype, difficult to mitigate Technical Specifications Component/Topic Specification Touch screen Screen Size 7” – 8” Touch control interface USB Actual Display interface Power HMI Computer Maximum Size VGA 12V VGA 12V (native) 20cm x 12cm x 16.5cm 12V Windows XP Embedded At least 3 USB 2.0 ports Met Power Operating system USB Interface 7.5” USB 12V (through inverter) Windows XP Home 4 USB 2.0 ports Technical Specifications Component/Topic CAN Controller Computer interface CAN Technology Specification Actual USB 2-wire, high-speed CAN USB High-speed or low-speed CAN Interface Software Interface Software platform CAN Interface Wiring DB-9 DB-9 LabVIEW 8.6 LabVIEW 8.6 No smaller than 20 AWG, stranded wire 16 AWG, stranded wire DB-9 One pair of twisted-pair wiring for CAN high and low signaling, one wire for ground DB-9 One pair of twisted-pair wiring for CAN high and low signaling, one wire for ground Connector Wiring configuration