CAN FD with Dynamic Multi-PDU-to-Frame Mapping

Transcription

1 CAN FD with Dynamic Multi-PDU-to-Frame Mapping Flexible Network Architectures V

2 E/E Trends and Challenges Why is Dynamic Multi-PDU-to-Frame Mapping required? The Trend: Demand for communication bandwidth The Solution: Faster network protocols with higher payloads The Challenge: Flexible E/E architectures that abstract the data link layer 2

3 Agenda Central Gateway Architecture A new Network Protocol: FlexRay A new Architecture: Backbone The CAN Evolution: CAN FD Dynamic Multi-PDU-to-Frame Mapping Ethernet and SOME/IP Testing and Analyzing Dynamic PDUs Summary 3

4 Central Gateway Architecture Splitting Networks To gain more bandwidth CAN networks were splitted into functional clusters The functional clusters were connected with a central gateway 4

5 Agenda Central Gateway Architecture A new Network Protocol: FlexRay A new Architecture: Backbone The CAN Evolution: CAN FD Dynamic Multi-PDU-to-Frame Mapping Ethernet and SOME/IP Testing and Analyzing Dynamic PDUs Summary 5

6 Reserved Payload preamble indicator Null frame indicatior Sync frame indicator Startup frame indicator A new Network Protocol: FlexRay FlexRay Features FlexRay Features Payload of up to 254 bytes Bit rate of up to 10 Mbit/s Two channels: A/B Time Triggered communication Frame ID Length Header CRC Data Msg ID Data NM Cycle DATA CRC 11 Bit 7 Bit 11 Bit 6 Bit 16 Bit 0-12 Byte Byte 24 Bit Header, 5 Bytes Payload, Bytes Trailer, 3 Bytes 6

7 Agenda Central Gateway Architecture A new Network Protocol: FlexRay A new Architecture: Backbone The CAN Evolution: CAN FD Dynamic Multi-PDU-to-Frame Mapping Ethernet and SOME/IP Testing and Analyzing Dynamic PDUs Summary 7

8 A new Architecture: Backbone Domain Controllers Functional clusters are controlled by a domain controller The domain controllers are interconnected by a backbone network 8

9 A new Architecture: Backbone Information Exchange Is a signal based information exchange still sufficient? Introduction of static PDUs 9

10 Agenda Central Gateway Architecture A new Network Protocol: FlexRay A new Architecture: Backbone The CAN Evolution: CAN FD Dynamic Multi-PDU-to-Frame Mapping Ethernet and SOME/IP Testing and Analyzing Dynamic PDUs Summary 10

11 SOF RRS IDE FDF res BRS ESI CRC Delimiter ACK ACK Delimiter The CAN Evolution: CAN FD CAN FD Features CAN FD Features: Payload of up to 64 bytes Data phase bit rate of currently 2 Mbit/s Event Triggered communication CAN FD Frame Identifier DLC Data Stuff CRC EOF IFS Count / Arbitration Phase (arbitration bit rate) Data Phase (optional high bit rate) Arbitration Phase (arbitration bit rate) 11

12 Agenda Central Gateway Architecture A new Network Protocol: FlexRay A new Architecture: Backbone The CAN Evolution: CAN FD Dynamic Multi-PDU-to-Frame Mapping Ethernet and SOME/IP Testing and Analyzing Dynamic PDUs Summary 12

13 Dynamic Multi-PDU-to-Frame Mapping General Concept Dynamic PDU A header with ID and DLC is required To abstract the data link protocol a frame is modeled as a Container-PDU 13

14 Dynamic Multi-PDU-to-Frame Mapping Transmission Behavior Dynamic PDU Triggering The triggering for a dynamic concept must be determined at runtime PDU trigger PDU1 PDU3 PDU2 PDU1 Container-PDU transmission timeout PDU2 Transmission trigger PDU transmission timeout Transmission trigger PDU transmission trigger Transmission trigger Buffer threshold trigger Transmission trigger 14 Buffer exceeded trigger Transmission trigger

15 Dynamic Multi-PDU-to-Frame Mapping PDU Mapping: Communication Patterns Two communication patterns Queued communication Last-is-best-communication 15

16 Dynamic Multi-PDU-to-Frame Mapping Benefits and Drawbacks Benefits Easier variant management Function mapping becomes more independent of the network design Transmitting node can be moved within the network > No modification of the receiving node required New functions can be added to the network > Not affected ECUs require no update > Unknown PDUs are just skipped Drawbacks Higher resource demand > Interrupt latencies increase > Reason: Each Container-PDU must be scanned for relevant PDUs Design rule for networks > Irrelevant messages must be kept away > E.g. using a domain architecture where the domain controller takes care of forwarded messages 16

17 Dynamic Multi-PDU-to-Frame Mapping Gateway Routing Signal Routing PDU Routing 17

18 Agenda Central Gateway Architecture A new Network Protocol: FlexRay A new Architecture: Backbone The CAN Evolution: CAN FD Dynamic Multi-PDU-to-Frame Mapping Ethernet and SOME/IP Testing and Analyzing Dynamic PDUs Summary 18

19 Ethernet and SOME/IP Automotive Ethernet Ethernet: Payload of up to 1500 bytes Bit rate of up to 100 Mbit/s Switched Network Peer-to-Peer communication Ethernet Communication Concepts Classical signal based communication > Multi-PDU-to-Frame Mapping applied like for CAN FD SOME/IP > Middleware for serializing/de-serializing data > Support of Publish-Subscribe Pattern > Support of service oriented communication > Data updates make use of the Dynamic PDU concept 19

20 Ethernet and SOME/IP Automotive Ethernet Interoperability SOME/IP Multi PDU-to-Frame Mapping 0 7 Bit 8 15 Bit Bit Bit Message ID/Service ID ID Method ID Length DLC Request ID Session ID Message Type Protocol Version Interface Version Return Code Payload Payload 20 AUTOSAR PDU SOME/IP Header

21 Agenda Central Gateway Architecture A new Network Protocol: FlexRay A new Architecture: Backbone The CAN Evolution: CAN FD Dynamic Multi-PDU-to-Frame Mapping Ethernet and SOME/IP Testing and Analyzing Dynamic PDUs Summary 21

22 Testing and Analyzing Dynamic PDUs Tool Requirements How can dynamic PDUs be analyzed? Test- and Analysis-Tool Architecture: Frame Layer Analysis Engine can-frame Analysis Engine ethernet-frame Analysis Engine flexray-frame CAN-Event Ethernet-Event FlexRay-Event Script Engine on canframe Script Engine on ethernetframe Script Engine on flexrayframe CAN-Event Ethernet-Event FlexRay-Event CAN Data Link Ethernet Data Link FlexRay Data Link 22 Event - Flow

23 Testing and Analyzing Dynamic PDUs Tool Requirements Introduction of a PDU Layer Test- and Analysis-Tool Architecture: PDU Layer Analysis Engine PDU PDU-Event Script Engine on PDU PDU-Event PDU Extraction PDU-Event PDU Extraction PDU-Event PDU Extraction CAN-Event Ethernet-Event FlexRay-Event CAN Data Link Ethernet Data Link FlexRay Data Link 23 Event - Flow

24 Agenda Central Gateway Architecture A new Network Protocol: FlexRay A new Architecture: Backbone The CAN Evolution: CAN FD Dynamic Multi-PDU-to-Frame Mapping Ethernet and SOME/IP Testing and Analyzing Dynamic PDUs Summary 24

25 Summary Dynamic Multi PDU-to-Frame Mapping CAN FD and Ethernet introduces new communication principles These require an abstraction between the signal and the data link layer The Dynamic Multi-PDU-to-Frame Mapping concept offers an ideal platform for these use cases The concept convinces with its high flexibility especially in event driven environments New approaches within tools are necessary for analyzing and testing PDUs 25

26 For more information about Vector and our products please visit Author: Decker, Peter Vector Germany Vector Informatik GmbH. All rights reserved. Any distribution or copying is subject to prior written approval by Vector. V