Title:
HUMIDITY SENSOR DIAGNOSIS DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/090669
Kind Code:
A1
Abstract:
Humidity sensor diagnosis functionality has been prone to deterioration resulting from exposure to the outside world. One embodiment of this invention comprises: a capacitance-to-voltage conversion circuit that has a plurality of reference capacitors with different capacitances and a switch for switching between the reference capacitors and is for outputting a voltage corresponding to the capacitance of a humidity sensor; and a diagnosis unit for comparing the output voltage from the capacitance-to-voltage conversion circuit with a reference voltage determined from a reference characteristic for the humidity sensor and diagnosing the humidity sensor on the basis of the result of the comparison. Additionally, when the output voltage of the capacitance-to-voltage conversion circuit is within a certain range, the diagnosis unit changes the output voltage by using the switch to change the capacitance of the capacitance-to-voltage conversion circuit and compares the output voltage after the change with the reference voltage.
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Inventors:
FUKUCHI EISAKU (JP)
MIKI TAKAHIRO (JP)
HOSHIKA HIROAKI (JP)
MIKI TAKAHIRO (JP)
HOSHIKA HIROAKI (JP)
Application Number:
PCT/JP2020/039325
Publication Date:
May 14, 2021
Filing Date:
October 20, 2020
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
G01N27/00; G01N27/02; G01N27/22
Foreign References:
| JP2014010011A | 2014-01-20 | |||
| JP2017125436A | 2017-07-20 | |||
| JP2006234576A | 2006-09-07 | |||
| JP2002156348A | 2002-05-31 | |||
| JP2018096698A | 2018-06-21 | |||
| JP2011094979A | 2011-05-12 | |||
| JP2006162572A | 2006-06-22 | |||
| JPS6358143A | 1988-03-12 | |||
| EP1607739A1 | 2005-12-21 |
Attorney, Agent or Firm:
TODA Yuji (JP)
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