F2008-05-098
Vehicle Diagnostics: Implementation of the New Standards IS0 22900 (Modular Vehicle Communication Interface) and ISO 22901 (Open Diagnostic Data Exchange)
The increasing mechatronic content in motor vehicles raises the necessity for efficient diagnostic methods and devices. Due to its nature, vehicle diagnostics are strongly linked with the aspects of data communication and bus systems.
Since the early seventies vehicle data communication has evolved rapidly to fulfil the needs for high data throughput, short response time and reliability. Initially bus physics and communication protocols were based on manufacturers´ proprietary specifications. In 1989 the requirements for the interchange of digital information (for diagnostic purposes) were standardized with ISO 9141. Significant standardization efforts followed with ISO 14230 (Keyword Protocol 2000), ISO 15031 (Emission Related Diagnostics), ISO 15765 (Diagnostics on CAN) and ISO 14229:2006 (Unified Diagnostic Services). But still considerable manufacturer specific differences exist in the implementation of the diagnostic data communication.
A significant step forward is currently being made with the corresponding standards ISO 22900 (MVCI: Modular Vehicle Communication Interface) and ISO 22901 (ODX: Open Diagnostic Data Exchange). MVCI offers convenient interfaces for offboard data communication on a low level (PDU API) as well as on a higher abstraction level (Server API) enabling interoperability and exchangeability of components. The ODX data model describes all kinds of diagnostic data with relevance to electronic control units, e. g. trouble codes, identification data, communication parameters).
This paper outlines the importance of these new norms. It describes in brief the technical background and the history of the work leading to the current draft standards ISO 22900 and ISO 22901. The universal approach will impact the intra-company workflow as well as cooperation between partners. Functionalities like flash programming of electronic control units exceed the scope of classical diagnostics. New technical options offer a vast potential of opportunities - demanding complex cross-organizational solutions. Technical aspects under consideration and latest developments will be discussed. The up-to-date roadmap will be presented and will be interpreted to give a further outlook.
Particular emphasis will be placed on practical aspects arisen from the recent months. Problems during current implementations will be described, going from specification uncertainties to logistic issues. A topic of specific interest is the migration of legacy systems. Besides the necessity of securing data consistency and data management in the future, the safeguarding of financial investments is essential.
This leads to economic points as implementation cost on one side and potential benefits on the other side. These are assumed to come from cost savings through OEM-independent designs, benefits in the process chain (including OEM and suppliers) and future expansions.
A unique overall perspective will be presented by giving a survey of recent global activities including OEMs, suppliers, software tool makers, manufacturers of test benches and of production equipment.
Session: Diagnosis