F F L L L L L L 13 KWP2000 K-Line, Layer 5-7: Service IDs Header Data bytes Checksum Fmt Tgt 1) Src 1) Len 1) SId 2) Data 2) CS max.
2) Service identification, part of data bytes. 255 bytes 1 byte Checksum calculation 1) Byte is optional, depending on format byte. CAN LRR SRR1 SRR2 Video ESP EPB EPS DLC CDC ARS PSI5 CAN ETC S/G BM Body & Comfort Electronics Infotainment & Cockpit Electronics Vehicle Motion Electronics Passive Safety Electronics Power Train Electronics 6 3Ĥ Communication System in the Vehicle Position Lever Unit Porsche Cayman Engine Control Unit Brake Control Unit Display Unit Transmission Control Unit 7 8 4ĥ K-Line Layer 1 Vehicle Tester Battery (~14,4V) K-Line ECU1 ECU2 ECUn GND 9 K-Line Layer 1 Logical 0: K-Line is under 20% of battery voltage at transmitter side K-Line is under 30% of battery voltage at receiver side Logical 1: K-Line is above 80% of battery voltage at transmitter side K-Line is above 70% of battery voltage at receiver side 10 5Ħ K-Line Layer 2: Overview No continuous communication: must be initialized by tester (WUP or 5BaudInit) No communication between the control units Each host has one or more fix addresses multicasting is also possible Fixed Baud-rate at start of the communication (10.4 kbaud), it can be changed (until 250kBaud) Defined but configurable timeout values for communication session, request response, response next request separation time Initialization phase determines several format parameters of the further communication Arbitration: CSMA/CD 11 K-Line Layer 2: Initialization WUP StartComm Communication 25ms 50ms Client Server WUP StartComm Communication 25ms 50ms Client ServerX Server1 Server2 ServerN 12 6ħ K-Line Layer 2: Message Structure Header Data bytes Checksum Fmt Tgt 1) Src 1) Len 1) SId 2) Data 2) CS max.
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Protection against stealing / manipulation Authentification of ignition key and other control units Chip-tuning protection Programmable / Patchable The main part of the control unit SW can be reprogrammed Should fulfill international and local standards CARB (Californian Air Resource Board) / OBD (OnBoard Diagnostic) EOBD (European OnBoard Diagnostic) KOBD (Korean OnBoard Diagnostic) ISO / ISO / ISO / ISO / ISO Vehicle Network Architecture in a High End Car CAN CGW D-CAN FlexRay E/E-Infrastructure Ethernet BCM1 BCM2 THU W-LAN USB Ethernet VMM PSM EPM LIN MOST AMP DAB/ SDARS.
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In case of error: surmount error or restrict own functionality according to the type of error Read out error code Provide information to find the source of the error After fixing error clear error memory Provide information to other control units Configuration interface Read and write configurable parameters (adapting to the other control units or local law) Automatic adaptation to environment Be able to clear learning values 4 2ģ Goal of the Diagnostic Communication III. Main task: Fulfill its controlling functionality Measure and collect the needed data for its main task Continuous observation of the control unit Check reactions of the control unit Check and filter the incoming / measured signals Detect and log errors Read error memory (source of the error, art and status) Check reliability of incoming / measured signals 3 Goals of the Diagnostic Communication II. control transmission unit) Measure and collect the needed data for its main tasks Check and filter the incoming / measured signals Detect and log errors In case of error according to the type surmount error, or restrict functionality Configuration interface Automatic adaptation to environment Protection against stealing / manipulation Fulfill international and local standards Programmable / Patchable Provide information to other control units Communicate with an external tester 2 1Ģ Goals of the Diagnostic Communication I.
1 Diagnostic Communication of Vehicles Electronic Transmission Control GS-TC/ENC TC/ENC-Bp Piroska, LászlL szló 1 Main Functionality of an Automotive Control Unit Main task: Fulfill its controlling functionality (e.g.
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