Civil Engineering Reference
In-Depth Information
- Analysis of current IT standards, e.g. for transport and network protocols to
current automotive standards.
6. Recognize the need for common services and data:
- Analyse existing data definitions from SAE J1939-21/71/73 and ISO
15031-5/6.
- Re-use OBD legislated definitions.
- Explore the impact of hierarchical DTC's.
7. Our vision of a 'Single Solution' encompasses the need for CAN, wireless and
wired Ethernet.
8. This vision provides a modular, structured methodology to achieve and support
wireless communications for OBD.
9. Our view of a 'Single Solution' across all vehicles is as follows:
- A single communication protocol for all off-board tester applications (e.g.
OBD, enhanced and reprogramming).
- A single set of services to retrieve and download information.
- A single set of OBD legislated data.
- A framework for the consistent 'look and feel' for the presentation of OBD
legislated data to the user.
Based on above-mentioned objectives and requirements from all parties involved an
implementation concept based on existing standards was developed and published
09/2006.
ISO/PAS 27145 Road vehicles—Implementation of WWH-OBD communica-
tion requirements consisting of four parts were developed:
• Part 1: General information and use case definition.
• Part 2: Common emission-related data dictionary.
• Part 3: Common message dictionary.
• Part 4: Connection between vehicle and test equipment.
Part 1 specifies three main use cases:
• Use case 1: Information about the emission-related OBD system state—The pur-
pose of this information package is to provide the minimum data set specified
as necessary by the WWH-OBD GTR to obtain the vehicle or engine state with
respect to its emission performance as specified in the WWH-OBD GTR. A typi-
cal use of this information package may be a 'roadside check' performed by an
enforcement authority.
• Use case 2: Information about active emission-related malfunctions—The pur-
pose of this information package is to provide access to the expanded data set
specified as necessary by the WWH-OBD GTR to determine vehicle readiness
and characterize the malfunctions detected by the OBD system. A typical use of
this information package may be a periodic inspection by enforcement authori-
ties.
• Use case 3: Information related to diagnosis for the purpose of repair—The pur-
pose of this information package is to provide access to all OBD data required by
the WWH-OBD GTR and available from the OBD system. A typical use of this
