Diagnosis concept for valve controlled coolant bypass paths
US8402820B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 2010 |
| Grant date | Mar 26, 2013 |
| Priority date | — |
| Expiry date | May 8, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T90/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system and method for determining whether a shut-off valve in a cabin heating by-pass line of a thermal sub-system associated with an engine has failed that uses the pump current for a pump that pumps the cooling fluid through the by-pass line. The method includes setting a predetermined constant speed of the pump and then providing a valve command that opens the by-pass valve. The method then determines if the pump current has increased or remained substantially the same when the by-pass valve is commanded open, and determines that the by-pass valve has not opened if the pump current remains substantially constant when the by-pass valve is commanded open.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.