US 12,066,485 B2
Circuit fault detection apparatus
Yuichiro Nakano, Kariya (JP); and Yohei Nakakura, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Mar. 16, 2021, as Appl. No. 17/203,453.
Application 17/203,453 is a continuation of application No. PCT/JP2019/029000, filed on Jul. 24, 2019.
Claims priority of application No. 2018-174048 (JP), filed on Sep. 18, 2018.
Prior Publication US 2021/0208195 A1, Jul. 8, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G01R 31/28 (2006.01); G01R 19/165 (2006.01)
CPC G01R 31/2884 (2013.01) [G01R 19/16571 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A circuit fault detection apparatus for detecting a fault in an electric circuit, comprising:
an AD conversion circuit configured to detect a voltage corresponding to a current flowing through a circuit fault detection element connected to the electric circuit or a voltage applied to the circuit fault detection element, and convert the voltage to a digital value;
a corrector configured to correct the digital value output by the AD conversion circuit or a measurement value as a voltage value representative of the digital value to a corrected measurement value as a value in a situation where a resistance value of the circuit fault detection element is preliminarily set to a standard resistance value;
a threshold value setting device configured to set a threshold value, which is compared with the corrected measurement value, closer to a normal value side than a limit value of the corrected measurement value determined based on a convertible range of the AD conversion circuit; and
a fault detector configured to detect whether or not the fault occurs in the electric circuit, based on comparison between the threshold value set by the threshold value setting device and the corrected measurement value.