9th International CTI Forum
The Relevance of Diagnostics
in Automotive Development
• Increased requirements for development tools in diagnostics, complex bus communication and analysis.
• Concept of a manufacturer-independent tool landscape.
Hans-Joachim Schleißheimer
CEO Schleißheimer GmbH
What is Diagnostics?
• Automotive diagnostics is:– Information exchange between vehicle
electronics and testing devices. – Used comprehensively during the complete
product cycle.– Relevant to all ECUs and numerous testing
systems.– Mainly a software feature.– Not visible to customers.
• Vehicle diagnostics is the “adjustable wrench” of our tool collection.
What is Diagnostics?
• On-board diagnostics– Built-in software functions of ECUs, used for self-
diagnosis and to monitor sensors and actuators.
• Off-board diagnostics– Specific diagnostic devices (testing tools)
combined with measurement technology, remaining bus simulation and databases.
What is Diagnostics?
• Each phase of the product cycle has specific requirements on diagnostics.
Development Validation Production Field
Application
•OBD (1988) (emission control)
•Service (repair shop testing devices)
•Checking, encoding•Testing during assembly (integration)
•Validating vehicle functions (HIL)
•Creating/validating individual functions•White-box software tests
(free access of variables, event tracing)
Field
Production
Validation
Development
Requirements
• Layer model
Transport (2..0)
Protocol (4..3)
Application (7..5)
Physical layer UART, CAN, TTC, VAN , LIN, CCD, FlexRay, MOST, Ethernet....
Transfer layer ISO-TP, TP1.6, TP2.0, J1939, FlexRay-TP, ...
Application protocols OBD (US, EU), KW2000, UDS, CCP, XCP, ...
The layers must match between the testing device and the ECU; they are the basis of all communication between testing device and ECU.
Topology
• Transport layer– High degree of variety; required to use diagnostics on
available busses.
• Protocol layer– Required in some cases; varied manufacturer-
specific requirements.
• Application layer– Progress (OBD, KW2000, UDS).– Increased requirements in development
(UDS XCP).
Variety
• KWP/UDS is available in nearly every project.
• XCP is seldom available, but better suited to development purposes, because:– XCP is faster due to reduced protocol overhead.– XCP offers improved access to internal data:
• Scalable variables (A2L)• Bypass capability • Event availability
Diagnostics in ECU Development
• Variable description– Description and declaration are inconsistent.Consistent description and declaration of
variables inside the code or inside the configuration. Check and automatic generation of A2L files during code creation.
• Events Not only measurements, but events and their
descriptions.
Future XCP Developments
• Adoption of XCP functionality(free variable access, scaling definitions in A2L
files, events)
• Variable increase of bandwidth (reduced timings as required )
Merging of UDS and XCP
Future UDS Developments
• Simultaneous recording of bus communication, values of variables and state changes in one log file.
• Display of variables and events in physical values or clear text.
Future Tool Developments
• Very good basis for software testing.
• Improved analysis capabilities.
• Considerably improved testing and analysis even in production devices.
Benefits for Development
Schleißheimer Soft- undHardwareentwicklung GmbH
Am Kalkofen 10D-61206 Nieder-Wöllstadt
Phone: +49 6034 9148-701Fax: +49 6034 9148-91
www.schleissheimer.de
www.CanEasy.de – user friendly analysis, testing, and remaining bus simulation for CAN and LIN buses. Start your product trial and begin saving
time right now!
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