Niterra Co., Ltd.

Honda Motor Co., Ltd.

Yuzo Higuchi

Satoru Abe

Yuji Oi

Junichiro Mitsuno

Michinori Tani

Akitsugu Ikeda

Hidetoshi Makino

Koji Ishibashi

Satoru Toda

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.

Sensor system and failure detection method for sensor system

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.

Gas sensor control device, gas sensor control system, and gas sensor system

A sensor system (S) including a current DA converter () outputting a control current (Ip) of a sensor element (S), a control unit (C) 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 () 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 () detecting an inspection current value (Ichv) of an inspection current (Ich) outputted from the current DAC, and a failure detection unit () 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.

Sensor system, and sensor system failure detecting method

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Nagoya, Japan

Yuzo Higuchi