奥迪总线CAN-BUS.pptVIP

Technical Service Training EX371 I/VK-5 Status: 03/01 Page * I/VK-5 Stand: 01/01 Service Technik Training EX050 Teilnehmerunterlagen Seite * A few characteristics of a CAN bus network Very fast data transfer among all participating control units possible. Drivetrain bus – 500 kBaud, convenience bus – 100 kBaud In comparison, ISDN - 64 kBit/second However, sections of the CAN data bus protocol do not contain relevant information. Therefore this rule is applicable: 100 kBaud (convenience bus) correspond to 64 kBit ISDN. (Baud was named after J.M.E Baudot) Use of common sensors by participating control units Simplification of wiring and smaller control units result in space saving. If one participant fails, the bus structure remains fully available for all other bus participants. Exception: If the engine control unit is faulty, no data can be transferred becausethe matching resistor of the drivetrain databusis integrated into the control unit. CAN data bus network (CAN – Controller Area Network) To prevent electromagnetic interference to data transfer,two data bus wires are twisted into a pair. At the same time, radiated interference from the data bus wire is prevented. Left turn signal Right turn signal A4 2001 J 285 M1 M4 M2 M3 J 519 X J 527 Convenience CAN bus E 1 58 D P E 1 E 2 M1 M4 M2 M3 X J 218 58ri 58 ri 58 58le 58 le 58 58 ri 58 le P D P S 58 S S Wiring A4 Predecessor For example, parking lights maximum 45 wires 9 plugs 60 wiring variations maximum 17 wires 2 plugs 2 wiring variations CAN data bus network participating components Drivetrain CAN bus Convenience CAN bus Display CAN bus CAN data bus network participating components - diagnosis VAS 6017 K wire L wire Diagnosis system Central wiring connections A-pillar, left Convenience data bus (orange-green) Information data bus (orange-violet) Drivetrain data bus (orange-black) A-pillar, right J234 G