Failure determining apparatus and method for hydraulic pressure control circuit
US7643924B2 · kind B2 · utility
7Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2006 |
| Grant date | Jan 5, 2010 |
| Priority date | — |
| Expiry date | Jun 26, 2028 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2200/2007
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An ECU executes a program that includes the steps of setting an abnormality flag when a hydraulic pressure switch is on even though a lock-up clutch is in a lock-up OFF state, forcing an SLU off when the lock-up clutch is on and the abnormality flag is on, determining that there is an SLU failure when the lock-up clutch is still in a lock-up ON state after a predetermined period of time has passed, and determining that there is a hydraulic pressure switch failure when the lock-up clutch is not in the lock-up ON state after the predetermined period of time has passed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.