Abnormality determination apparatus and abnormality determination method for valve characteristics change mechanism
US7921711B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 26, 2009 |
| Grant date | Apr 12, 2011 |
| Priority date | — |
| Expiry date | Aug 27, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
To an electronic control unit is connected a shaft position detection sensor that outputs, as a shaft position detection value, a signal whose magnitude changes stepwise by a predetermined amount in correspondence with the position of a control shaft of a valve characteristics change mechanism. The electronic control unit stores in advance, as a determination reference value, the drive amount of an actuator at the time when the magnitude of the shaft position detection value changes. The electronic control unit performs normality determination to indicate that the valve characteristics change mechanism is operating normally when the drive amount at the time when the shaft position detection value changes along with driving of the actuator and the determination reference value correspond to each other, and performs abnormality determination to indicate that an abnormality is occurring in the valve characteristics change mechanism when the drive amount and the determination reference value do not correspond to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.