Title:
PHYSICAL QUANTITY DETECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/056672
Kind Code:
A1
Abstract:
The purpose of the present invention is to enhance the detection accuracy of an absolute humidity determined from at least temperature and relative humidity when carrying out temperature control using a heating element according to detection characteristics for temperature and relative humidity. A physical quantity detection device according to the present invention is provided with a humidity sensor 422 for detecting relative humidity and temperature, a heater 750 for heating the humidity sensor, and a microcomputer 415 and controls the heat generation amount of the heater by using the heater for heating and stopping heating such that an environment under measurement is at least a room temperature and is a temperature at which a relative humidity detection characteristic and temperature detection characteristic for the humidity sensor 422 improve, thereby enhancing the accuracy of absolute humidity detection.
Inventors:
ISOYA YUKI (JP)
HOSHIKA HIROAKI (JP)
YOGO TAKAYUKI (JP)
MIKI TAKAHIRO (JP)
HOSOKAWA TAKEO (JP)
HOSHIKA HIROAKI (JP)
YOGO TAKAYUKI (JP)
MIKI TAKAHIRO (JP)
HOSOKAWA TAKEO (JP)
Application Number:
PCT/JP2016/072252
Publication Date:
April 06, 2017
Filing Date:
July 29, 2016
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
G01N25/62
Foreign References:
| JP2002286677A | 2002-10-03 | |||
| JPS50120885A | 1975-09-22 | |||
| JPH11142256A | 1999-05-28 | |||
| JP2014038056A | 2014-02-27 |
Other References:
See also references of EP 3358343A4
Attorney, Agent or Firm:
TODA Yuji (JP)
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