US 12,265,070 B2
Sensor system and failure detection method for sensor system
Akitsugu Ikeda, Tokyo (JP); Michinori Tani, Tokyo (JP); Yuzo Higuchi, Nagoya (JP); and Satoru Abe, Nagoya (JP)
Assigned to HONDA MOTOR CO., LTD., Tokyo (JP); and NITERRA CO., LTD., Nagoya (JP)
Filed by HONDA MOTOR CO., LTD., Tokyo (JP); and NGK Spark Plug Co., LTD., Nagoya (JP)
Filed on Nov. 15, 2021, as Appl. No. 17/526,537.
Claims priority of application No. 2020-191179 (JP), filed on Nov. 17, 2020.
Prior Publication US 2022/0155272 A1, May 19, 2022
Int. Cl. G01N 33/00 (2006.01); G01M 15/10 (2006.01); G01R 19/10 (2006.01); G01R 31/10 (2006.01)
CPC G01N 33/007 (2013.01) [G01R 19/10 (2013.01); G01R 31/10 (2013.01); G01M 15/104 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A sensor system comprising:
a sensor element to which a control current is input;
a DA converter configured to output the control current toward the sensor element;
a control part configured to generate a control current instruction value corresponding to a magnitude of the control current and to input the control current instruction value to the DA converter;
an instruction value generation part configured to sequentially generate an inspection current instruction value per every predetermined generation cycle, said inspection current instruction value being input to the DA converter and changing in steps of a magnitude of 1 LSB from a first inspection current instruction value generated first to a final inspection current instruction value generated last;
an inspection current detection part configured to detect an inspection current value of an inspection current output from the DA converter to which the inspection current instruction value is input;
an expected value calculation part configured to calculate an inspection current expected value, which is an expected value of the inspection current value expected to be detected by the inspection current detection part, by the inspection current instruction value being input to the DA converter;
a difference value acquisition part configured to acquire a difference value between the detected inspection current value and the calculated inspection current expected value, corresponding to the same inspection current instruction value; and
a failure detection part configured to detect a failure of a bit of the DA converter by frequency analysis of a temporal change of the sequentially obtained difference value.