Method and apparatus to monitor a valve adapted to control mode to gear transitions during operation of an electro-mechanical transmission
US7878932B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2007 |
| Grant date | Feb 1, 2011 |
| Priority date | — |
| Expiry date | Jan 30, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0396
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Monitoring operation of an electro-mechanical transmission having a hydraulic circuit with flow management valves and pressure control solenoids to actuate clutches and pressure monitoring devices to monitor the hydraulic circuit is provided. The transmission operates in fixed gear and continuously variable operating range states. The method comprises controlling position of one of the flow management valves to control operation in one of the operating range states. A fault is detected in the one of the flow management valves based upon outputs of the pressure monitoring devices during steady state operation in one of the continuously variable operating range states. A fault is detected in the one of the flow management valves based upon the output of one of the pressure monitoring devices during a transition in the flow management valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.