Ngk Spark Plug Company, Limited

Junichiro Mitsuno

Satoru Abe

Chihiro Tomimatsu

Hidetoshi Makino

Tomonori Uemura

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.

Sensor control device and gas detection system

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.

Anomaly determination apparatus and control system

A gas sensor control apparatus () for controlling a gas sensor () includes a change amount detection means (); an element resistance detection means for detecting the element resistance Rpvs of a sensor element section () on the basis of the response change amount &#x394;Vs; a heater energization control section for on-off controlling the supply of electric current to a heater section () by pluses PS having a fixed period T; and an instruction signal output section for instructing the change amount detection section () to detect the response change amount &#x394;Vs at a third timing twhich comes after elapse of a predetermined wait time TW from a second timing t(heater energization off) which changes in accordance with the pulse width PSW.

Gas sensor control apparatus

A load driving device includes a pulse driving circuit which has a capacitor between an output terminal and a ground potential, a level detection circuit which detects whether an output terminal voltage on the output terminal of the pulse driving circuit is at high level or at low level, a switching discharge unit for forming a discharge path through which electric charges charged in a capacitor are discharged by switching of a switch from a non-discharge side to a discharge side, and switching the switch to the discharge side over a discharge maintenance time in a state where the application of a pulse voltage by the pulse driving circuit stops and the output terminal voltage is maintained at high level, a post-discharge detection unit, and a determination unit.

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Konan, Japan

Junichiro Mitsuno