Diagnostic communication within networks based on Autosar

1. Diagnostic communication within networks
based on AUTOSAR configuration
Vector Congress 2010
Ralf Schmidgall
Global Service & Parts, Bereich für Diagnose- und Flash-Technologien

2. 2Vector Congress 2010Ralf Schmidgall – DAIMLER AG
Global Service & Parts
Diagnostic communication within networks based on
AUTOSAR configuration
1 Diagnostic Communication
2 Gateway Routing Strategy
4 Summary and Outlook
3 AUTOSAR Gateway

3. 3Vector Congress 2010Ralf Schmidgall – DAIMLER AG
Global Service & Parts
Typically
transfered
data volume
Diagnostic
Communication
Scenarios
Diagnostic Communication
Scenarios and data volume
OBD
Enhanced
Programming
Response
Response
Request
Request
ECUTest Tool
≤ 7 Byte
≤ 1000 Byte
≤ 1000 Byte
≤ 1000 Byte
≥ 10.000Byte
≤ 100 ByteResponse
Request

4. 4Vector Congress 2010Ralf Schmidgall – DAIMLER AG
Global Service & Parts
OBD-
Connector ECU
ECU
ECU
ECU
ECU
ECU
GatewayGateway
ECU
ECU
Test Tool
Possible routing relations within vehicle networks.
Diagnostic Communication
Diagnostic Communication using functional network
Diagnostic communication using the functional network.
Diagnostic communication needs access to each ECU.
XMOST
XXEthernet
XXFlexRay
XXLIN
XXXXCAN
MOSTEthernetFlexRayLINCAN
Routing complexity
has been increased
significantly.
OBD-
Connector ECU
ECU
ECU
ECU
ECU
ECU
GatewayGateway
ECU
ECU
Test Tool

5. 5Vector Congress 2010Ralf Schmidgall – DAIMLER AG
Global Service & Parts
OSI Reference
Model
Gateway Routing Strategies
Homogeneous vs. heterogeneous networks
Layer 4
Heterogenous networkHomogeneous network
GatewayGateway
FlexRayCAN
TP TP
CANCANLayer 1-3
Layer 5-7
• Routing on Network Layer (Layer 3)
• Gateway (Bridge) is transparent
• Routing: „On-The-Fly“
• Routing on Transport Layer (Layer 4)
• Gateway is not transparent
• Routing: „Store-And-Forward“
Routing
strategy
t t t t

6. 6Vector Congress 2010Ralf Schmidgall – DAIMLER AG
Global Service & Parts
AUTOSAR Gateway
Software module architecture
Interface
TP
PduR
Driver
DCMCOM
ECU Gateway
Interface
Driver
Interface
Driver
…
The initial AUTOSAR gateway software module architecture is
derived from AUTOSAR‘s ECU software module architecture.
TP
PduR
TP
Routing on layer-4
Important for the diagnostic
communication routing
performance is the inter-
action between
Transport Protocol (TP)
and PduRouter (PduR)

7. 7Vector Congress 2010Ralf Schmidgall – DAIMLER AG
Global Service & Parts
SF.. SingleFrame/
SF.. StartFrame
AUTOSAR-Gateway
P2-Timeout
SF SF SF
SFSFSF
P2Timeout
Create
Response
Gateway ECU
DCM
TP
PduR
TPTP
PduR
Gateway
TP
PduR
Tester
UDS
TP
xxx
TP
ISO 15765-4 OBD communication requirement: P2Timeout = 50 ms
This is required for segmented and unsegmented communication.
The first frame of a segmented or unsegmented communication
shall be routed immediately by the PDU-Router

8. 8Vector Congress 2010Ralf Schmidgall – DAIMLER AG
Global Service & Parts
N_CrTimeout
AUTOSAR Gateway
N_Cr-Timeout
SF SF SF
FFFFFF
P2Timeout
Create
Response
FC FC
CF
CF
CF
FC
CF
CF
CF
CF
CF
CF
Gateway ECU
DCM
TP
PduR
TPTP
PduR
Gateway
TP
PduR
Tester
UDS
TP
xxx
TP
STmin
SF.. SingleFrame/
SF.. StartFrame
FC.. FlowControl
CF.. ConsecutiveFrame
ISO 15765-4 OBD communication requirement: N_CrTimeout = 150 ms
The communication performance is influenced by the
PDU-Router configuration.

9. 9Vector Congress 2010Ralf Schmidgall – DAIMLER AG
Global Service & Parts
AUTOSAR Gateway
PDUR-Parameter
Tester GW1 GW2 ECU
Bus 1 Bus 2 Bus 3
Routing Routing
RoutingRouting
Request
Response
Threshold Threshold
Threshold Threshold
Timing Requirements
Timeout
CAN
Bus Systems Requirements ECU Mode
Threshold – The central parameter for gateway performance
Flashloader
Mode
Application
Mode

10. 10Vector Congress 2010Ralf Schmidgall – DAIMLER AG
Global Service & Parts
AUTOSAR Gateway
PDUR-Parameter
CAN – FlexRay Routing Performance (Layer4-Routing)
CAN-TP Parameter
• Blocksize
• STmin
FlexRay TP Parameter:
• MaxPduPerCycle (MPPC)
FlexRay Schedule
• Cycle Repetition
Diagnostic communication
performance depends on the
basic FlexRay schedule
definitions (slot arrangement).
BlockSize

11. 11Vector Congress 2010Ralf Schmidgall – DAIMLER AG
Global Service & Parts
AUTOSAR Gateway
PDUR-Parameter definition is complex
OBD
Enhanced
Diagnostic
SW-Re-
programming
Contrary requirements
Data Transfer
rate
Buffer
size
Timeout
Requirements
High dependenciesVehicle and ECU
architecture
ECUGW GWTester
Appl
FBL
PduR Configuration • Each diagnostic connection is divided into the different bus segments.
• Definition of a parameter set for each bus segment and the corresponding
gateways.
• Some additional parameters shall be part of the system description.

12. 12Vector Congress 2010Ralf Schmidgall – DAIMLER AG
Global Service & Parts
Summary and Outlook
Summary •Diagnostic communication configuration within AUTOSAR is complex
(parameters set for gateways within System Description).
•With different physical bus systems a layer-4 routing is necessary.
•Gateway configuration has a deep impact for communication performance
•The PduR was initially not designed with focus on gateway activities for
diagnostic communication scenarios (OBD, Reprogamming, enhanced
diagnostic).
Outlock Discussion (lessons learned) within the
AUTOSAR community about the basic
gateway functionalities like:
• layer-3 routing
• layer 4 routing
• buffer handling
• timing/timeout handling
• …
Provides the PduR all required functionality?
Interface
Driver
Interface
Driver
TP
PduR
TP
Gateway

13. 13Vector Congress 2010Ralf Schmidgall – DAIMLER AG
Global Service & Parts
Vielen Dank für Ihre Aufmerksamkeit
Vielen Dank für Ihre Aufmerksamkeit