Reference angle detecting device
US9116525B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2011 |
| Grant date | Aug 25, 2015 |
| Priority date | — |
| Expiry date | Sep 4, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B61/02
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A reference angle detecting device includes a control shaft connected to a controlled object, an electric motor causing the control shaft to rotate via a worm gear mechanism, a stopper disposed on a motion track of a worm wheel, an angle sensor that can detect a rotation angle of the control shaft, and a controller. The stopper includes a spring member which is elastically deformable in an operation direction of the worm wheel. The controller drives the electric motor to operate so that the worm wheel may face the stopper, and stores the rotation angle at a time point when a change rate ω of the rotation angle θ detected by the angle sensor changes to a value less than a predetermined threshold ω1 as a reference angle θ0. Therefore, the reference angle can be detected with high accuracy for control of an angle of the control shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.