Title:
湿度センサ診断装置
Document Type and Number:
Japanese Patent JP7325528
Kind Code:
B2
Abstract:
A diagnostic function of a humidity sensor is exposed to the outside and the humidity sensor is likely to deteriorate.An aspect of the present invention includes: a capacitance-voltage conversion circuit which includes a plurality of reference capacitors having different pieces of capacitance and a switch which switches the reference capacitors and outputs a voltage according to the capacitance of a humidity sensor; and a diagnosis unit which compares an output voltage of the capacitance-voltage conversion circuit with a reference voltage obtained from a reference characteristic of the humidity sensor and diagnoses the humidity sensor based on a comparison result. Also, the diagnosis unit changes the output voltage by changing the capacitance of the capacitance-voltage conversion circuit using the switch in a state in which the output voltage of the capacitance-voltage conversion circuit is within a certain range and compares the changed output voltage with the reference voltage.
Inventors:
Eisaku Fukuchi
Takahiro Miki
Hiroaki Hoshika
Takahiro Miki
Hiroaki Hoshika
Application Number:
JP2021554865A
Publication Date:
August 14, 2023
Filing Date:
October 20, 2020
Export Citation:
Assignee:
Hitachi Astemo, Ltd.
International Classes:
G01N27/22; F02D35/00; G01N27/00; G01N27/02
Domestic Patent References:
| JP2003028825A | ||||
| JP2017036696A | ||||
| JP2014240821A | ||||
| JP2012078337A | ||||
| JP2012093113A | ||||
| JP2006234576A | ||||
| JP2013134078A | ||||
| JP2010008318A |
Foreign References:
| US20150354489 |
Attorney, Agent or Firm:
Patent Attorney Corporation Shinyu International Patent Office
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