Ignition-off timer diagnostic
US6531872B1 · kind B1 · utility
7Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2000 |
| Grant date | Mar 11, 2003 |
| Priority date | — |
| Expiry date | Feb 5, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method and an apparatus for diagnosing the Ignition-Off Timer of an internal combustion engine. This invention monitors the initial operation of the Ignition-Off Timer each time it is enabled in order to detect a variety of malfunctions. The malfunctions are detected by comparing the operation of the Ignition-Off Timer to various reference values. Upon diagnosis of the Ignition-Off Timer, its condition is reported to the diagnostic management system, which determines whether and when a malfunction indicator is energized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.