9. Early Auto Comm Networks
• GM Assembly Line Diagnostic Link (ALDL)
– 160 Baud, might as well be handwritten notes
• J1820 Serial Data
– 10.4kb/sec one wire, 41.6kb/sec two wire.
– Phone modems are faster
• ISO 9141
– Used by Chrysler, European, Japanese
– 56.6kb/sec modem still beats it by a mile
• Slow speeds prevent fast data transfer
11. Controller Area Networks features
• All inputs and outputs to CAN system share a
common circuit, think of a race track
• CAN circuit is two wire, twisted pair of wires
to reduce electrical interference
• CAN L is low speed circuit at 250kb/sec, used
for body control functions
• CAN H is high speed circuit at 500kb/sec. used
for engine, trans, ABS, SRS controls
• CAN system will function if one wire damaged
22. Can you think of an example of a
Wireless network in a car?
23. Wireless?
• OnStar (GM)
• Global Positioning System
• Blue Tooth
• Blue Connect
• Personal Data Assistant
• Tire Pressure Monitoring System
• Smart Key
• FUTURE?
