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 Touch Screen

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 ProposedActual Real-time data Fuel efficiencyGPS Motor and engine operating points Emissions composition2-mode transmissions status Battery SOC Historical data Projected mileage on current drive cycle GPS tracing Fuel savedSpeed history Diagnostic data Low fuelOil pressure and temperature Engine overheatingBattery temperature

Vehicle Panel

Engine Panel

2-Mode Panel

Electric Panel

GPS Panel

Diagnostics 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 x86 Architecture LabVIEW compatible 6 USB ports Xenarc 705TS 7.5” display 4-wire, USB touch interface 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 previously- obtained 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 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 Power Handling

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

Prototype Labor 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

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/TopicSpecificationActual Touch screen Screen Size7” – 8”7.5” Touch control interfaceUSB Display interfaceVGA Power12V12V (native) HMI Computer Maximum Size20cm x 12cm x 16.5cm Met Power12V12V (through inverter) Operating systemWindows XP Embedded Windows XP Home USB InterfaceAt least 3 USB 2.0 ports 4 USB 2.0 ports

Technical Specifications Component/TopicSpecificationActual CAN Controller Computer interfaceUSB CAN Technology2-wire, high-speed CANHigh-speed or low-speed CAN InterfaceDB-9 Software Interface Software platformLabVIEW 8.6 CAN Interface WiringNo smaller than 20 AWG, stranded wire 16 AWG, stranded wire ConnectorDB-9 Wiring configurationOne pair of twisted-pair wiring for CAN high and low signaling, one wire for ground