Title:
CAPACITY TYPE PHYSICAL QUANTITY DETECTOR
Document Type and Number:
Japanese Patent JP2019215189
Kind Code:
A
Abstract:
To provide a capacity type physical quantity detector capable of determining abnormality of a signal processing circuit.SOLUTION: The capacity type physical quantity detector is configured to input a correction capacity Ca and a diagnosis capacity Cb different from the correction capacity Ca to a CV conversion circuit 40 from a correction circuit 50. An abnormality diagnosis circuit 60 is configured to output a normal conversion voltage Vout1 and a diagnosis conversion voltage Vout 2 from the CV conversion circuit 40 by inputting the correction capacity Ca and the diagnosis capacity Cb into the CV conversion circuit 40 from the correction circuit 50. In addition, the abnormality diagnosis circuit 60 calculates a difference between the normal conversion voltage Vout1 and the diagnosis conversion voltage Vout2 to generate a determination voltage V, and determines whether or not the determination voltage V is included in a permissible voltage range on the basis of the correction capacity Ca and the diagnosis capacity Cb, thereby performing abnormality diagnosis of a signal processing circuit 20.SELECTED DRAWING: Figure 1
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Inventors:
HAKAMADA MASAYA
Application Number:
JP2018111335A
Publication Date:
December 19, 2019
Filing Date:
June 11, 2018
Export Citation:
Assignee:
DENSO CORP
International Classes:
G01P15/125; G01P21/00
Domestic Patent References:
| JP2015135245A | 2015-07-27 |
Foreign References:
| US20090128395A1 | 2009-05-21 |
Attorney, Agent or Firm:
Patent Business Corporation Yuai Patent Office