公开(公告)号：US10746689B2

公开(公告)日：2020-08-18

申请号：US15899184

申请日：2018-02-19

Applicant: NGK Spark Plug Co., LTD.

Inventor： Yuzo Higuchi ,  Satoru Abe ,  Koji Ishibashi

IPC: G01N27/406 ,  G01N27/419 ,  G01N27/407 ,  G01N27/417 ,  G01N33/00 ,  G01N27/414 ,  G01N27/12

Abstract: A sensor element drive circuit is a circuit including a plurality of semiconductor elements formed on a semiconductor substrate for realizing a current control function and a switching function. The current control function is a function of controlling the current flowing between electrodes such that the potential difference between electrodes becomes constant. The switching function is a function for switching between a connected state in which the electrodes are electrically connected to a sensor control apparatus and a cut-off state in which electrical continuity therebetween is broken. When one of an Ip+ terminal, a COM terminal, and a Vs+ terminal is determined to have an anomalous potential, the sensor control apparatus causes the sensor element drive circuit to perform switching from the connected state to the cut-off state, and connects the semiconductor substrate to a negative voltage lower than a ground potential applied to the sensor element drive circuit.

公开(公告)号：US12174139B2

公开(公告)日：2024-12-24

申请号：US17279734

申请日：2020-03-09

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yuzo Higuchi ,  Koji Ishibashi ,  Junichiro Mitsuno ,  Satoru Abe ,  Yuji Oi

IPC: G01N27/30 ,  F02D41/14 ,  G01N27/419

Abstract: A gas sensor control device having a DA conversion circuit configured to supply a pump current having a magnitude corresponding to an inputted digital signal to the pump cell, a reference electric potential generating circuit configured to keep an electric potential of the first pump electrode at a reference electric potential, a diagnostic resistance connected to the pump cell parallel to the pump cell, and an output part configured to output a signal relating to voltage applied to the diagnostic resistance when inputting an arbitrary digital signal to the DA conversion circuit in a situation in which oxygen ion conductivity does not occur in the pump cell to an external device.