Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
SENSOR DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/155057
Kind Code:
A1
Abstract:
The purpose of the present invention is to make detection element responsiveness diagnosis after shipment possible while suppressing the costs associated with characteristic acquisition before shipment in a sensor device for which damping has been adjusted such that a detection element does not have gain at a resonant frequency. In a sensor device 100 provided with a detection element 102 that is provided in a hermetically sealed cavity and has a transducer, a response amplitude detection unit for detecting the response amplitude of the detection element 102 in relation to the excitation of the transducer is provided with response amplitude acquisition units 103, 104, 108, 111-113 for acquiring a first response amplitude and second response amplitude corresponding to a first frequency and second frequency or first time and second time that are two different points on the frequency axis or time axis for the response amplitude and a determination unit 114 for determining whether there is a pressure abnormality in the cavity 501 on the basis of the relationship between the first response amplitude and second response amplitude.

Inventors:
MAEDA DAISUKE (JP)
YAGUCHI AKIHIRO (JP)
HAYASHI MASAHIDE (JP)
Application Number:
PCT/JP2018/002202
Publication Date:
August 30, 2018
Filing Date:
January 25, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
G01P21/00; G01C19/5776; G01L9/00; G01P15/08; G01P15/125
Foreign References:
JP2016170089A2016-09-23
JP2010286369A2010-12-24
JP2002062311A2002-02-28
JPH11258092A1999-09-24
JPH09500726A1997-01-21
US5511427A1996-04-30
Attorney, Agent or Firm:
TODA Yuji (JP)
Download PDF:
View/Download PDF      PDF Help



 
Previous Patent: AIR CONDITIONER

Next Patent: SECONDARY BATTERY AND USAGE METHOD FOR SECONDARY BATTERY