Title:
DEVICE AND METHOD FOR DETECTING POSITION OF NEEDLE OF ELECTROMAGNETIC ACTUATOR
Document Type and Number:
WIPO Patent Application WO/2014/091823
Kind Code:
A1
Abstract:
In the present invention, by applying a stepped voltage at a plurality of levels to a coil, obtaining a plurality of measurement values based on the variation of a coil current when each level of voltage is applied, comparing a first table and second table in which the measurement values are associated with variations in the inductance of the coil, and thereby uniquely determining the position of a needle of an electromagnetic actuator, it is possible to distinguish between the position of adhesion of the needle during a drop in inductance due to magnetic saturation and the position of separation of the needle during a drop in inductance due to enlarging of an air gap between the needle and a stator bottom.
Inventors:
ITOU NORIKAZU (JP)
SAKAI MASAYA (JP)
SAKAI MASAYA (JP)
Application Number:
PCT/JP2013/078554
Publication Date:
June 19, 2014
Filing Date:
October 22, 2013
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
G01D5/20; G01B7/00; H01F7/16; H01F7/18
Domestic Patent References:
| WO2011084239A2 | 2011-07-14 |
Foreign References:
| JP2009131133A | 2009-06-11 | |||
| JP2004219089A | 2004-08-05 | |||
| US5481187A | 1996-01-02 | |||
| GB2435772A | 2007-09-05 |
Attorney, Agent or Firm:
SOGA, Michiharu et al. (JP)
Michiharu Soga (JP)
Michiharu Soga (JP)
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