Failure diagnosis method of vehicle communication network
US7082357B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jan 20, 2004 |
| Grant date | Jul 25, 2006 |
| Priority date | — |
| Expiry date | Feb 22, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2012/40273
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
When a resistance value of a CAN bus main line is 60 Ω, the CAN bus main line is in a normal state. However, the resistance value thereof differs depending on an abnormality portion when an abnormality such as disconnection, short circuit, or the like has occurred in it or a branch line. Therefore, the abnormality portion can be identified depending on the measured resistance value.In addition, a failure diagnosis portion of an ECU stores different diagnosis trouble codes in the memory for the following cases; when an abnormality has occurred in the CAN bus communication, when various sensors are malfunctioning, and when an abnormality such as disconnection has occurred in a communication line that is connected to the various sensors. Accordingly, the resistance value of the CAN bus main line is measured, and the abnormality portion can be identified by a combination of the resistance value and the diagnosis trouble code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.