公开(公告)号：US10830729B2

公开(公告)日：2020-11-10

申请号：US15980817

申请日：2018-05-16

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Junichiro Mitsuno ,  Satoru Abe ,  Chihiro Tomimatsu ,  Hidetoshi Makino

IPC: G01N27/406 ,  G01N27/41

Abstract: In a sensor control device which controls a sensor, a first filter unit extracts a first filtered signal obtained by attenuating a frequency component higher than a first cutoff frequency from a digital signal indicating a current-application control value for a pump current, and a second filter unit extracts a second filtered signal obtained by attenuating a frequency component higher than a second cutoff frequency from the first filtered signal. A cutoff frequency setting unit sets at least one of the first cutoff frequency and the second cutoff frequency such that the sensor control device can control at least two types of sensors.

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：US10669963B2

公开(公告)日：2020-06-02

申请号：US15956430

申请日：2018-04-18

Applicant: NGK Spark Plug Co., LTD.

Inventor： Junichiro Mitsuno ,  Satoru Abe ,  Chihiro Tomimatsu ,  Hidetoshi Makino

IPC: F02D41/14 ,  G01N27/417 ,  G01N33/00 ,  F02D41/28 ,  G01N27/04 ,  G01N27/406 ,  G01N27/419

Abstract: An anomaly determination apparatus determines an anomaly of a current control apparatus which supplies a control current to a control target and includes a current anomaly determination section. The current anomaly determination section is configured to compare a normal numerical range within which a state quantity changing with the control current falls in a particular state with a particular state quantity which is the state quantity corresponding to the control current generated by the control current generation section in the particular state, and determine that at least one of the reference resistor, the reference current generation section, and the control current generation section is in an anomalous state in the case where the particular state quantity has deviated from the normal numerical range. By using the current anomaly determination section, the anomaly determination apparatus can determine an anomaly of the current control apparatus.

公开(公告)号：US12265070B2

公开(公告)日：2025-04-01

申请号：US17526537

申请日：2021-11-15

Applicant: HONDA MOTOR CO., LTD. ,  NGK Spark Plug Co., LTD.

Inventor： Akitsugu Ikeda ,  Michinori Tani ,  Yuzo Higuchi ,  Satoru Abe

IPC: G01N33/00 ,  G01M15/10 ,  G01R19/10 ,  G01R31/10

Abstract: A sensor system includes a sensor element to which a control current is inputted, a DA converter to output the control current, and a control part configured to generate a control current instruction value and input the control current instruction value to the DAC, and further includes an instruction value generation part to sequentially generate an inspection current instruction value to be inputted to the DAC instead of the control current instruction value, an inspection current detection part to detect an inspection current value of an inspection current, an expected value calculation part to calculate an inspection current expected value, a difference value acquisition part to acquire a difference value between the inspection current value and the inspection current expected value, and a failure detection part to detect a failure of a bit in the DA converter, by frequency analysis of a temporal change of the difference value.

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.

公开(公告)号：US10082480B2

公开(公告)日：2018-09-25

申请号：US15597826

申请日：2017-05-17

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Satoru Abe ,  Tomonori Uemura ,  Tetsuya Ito ,  Satoshi Teramoto

IPC: G01N27/409 ,  G01N27/407 ,  G01N33/00

CPC classification number: G01N27/409 ,  F02D41/1446 ,  F02D41/1456 ,  G01N27/4073 ,  G01N33/0036

Abstract: A gas concentration detection device for detecting a gas concentration using a limiting current type gas concentration sensor. In an application voltage line set to pass through a plurality of limiting current regions for different values of gas concentration, a ratio for lean is set as a ratio of change in current with respect to a change in voltage when an air/fuel ratio corresponding to the gas concentration is lean, and a ratio of rich different from the ratio for lean is set when the air/fuel ratio is rich.

公开(公告)号：US12163917B2

公开(公告)日：2024-12-10

申请号：US17630209

申请日：2020-10-08

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yuzo Higuchi ,  Yuji Oi ,  Satoru Toda ,  Satoru Abe ,  Junichiro Mitsuno ,  Hidetoshi Makino

IPC: H03M1/10 ,  G01M15/10 ,  G01N27/419 ,  G01R19/252 ,  G01R31/28

Abstract: A sensor system (1, 1S) including a current DA converter (42) outputting a control current (Ip) of a sensor element (3S), a control unit (4C) generating a control current instruction value (Ipcmd) corresponding to magnitude of the control current and inputting this instruction value to the current DAC, an instruction value sequence generating unit (47) generating, instead of the control current instruction value, an inspection instruction value sequence (RChcmd) in which predetermined inspection current instruction values (Chcmd) inputted to the current DAC are arranged in order and by which failure of the current DAC can be detected, an inspection current detection unit (71) detecting an inspection current value (Ichv) of an inspection current (Ich) outputted from the current DAC, and a failure detection unit (8) detecting failure of the current DAC from an inspection current value sequence (RIchv) in which the inspection current values are arranged in order of detection.