Denso Corporation

Toru Katafuchi

Eiichi Kurokawa

Takehito Kimata

Hiromi Sano

Tomoo Kawase

Naoto Miwa

Toshitaka Saito

Kiyomi Kobayashi

Yuusuke Toudou

Keigo Mizutani

Masahiro Yamamoto

Masayuki Tamura

Ryozo Kayama

Go Miyagawa

Yusuke Kawamoto

Yuto Tamei

An SCU as a control device for the gas sensor (first and second NOx sensors) includes an applied voltage switching unit for switching an applied voltage of a pump cell when a deterioration detecting function is performed, and a deterioration rate calculation unit for calculating a deterioration rate of a sensor cell based on a slope during a transient change in an output of the sensor cell according to a switching of the applied voltage by the applied voltage switching unit.

Control device for gas sensor

A sensor element which has a pair of positive and negative detection electrodes disposed on a surface of an insulation body as a detecting portion and a cover body configured to cover an opening of a cylindrical housing. The cover body is provided with gas inlet and outlet holes via which the measuring gas is introduced and discharged. The pair of detection electrodes have a plurality of wire electrodes. The wire electrodes electrically connected to the positive electrode and the wire electrodes electrically connected to the negative electrode are alternately arranged in parallel. Any one of a first insulation layer which is a narrow electrode interval Dn and a second insulation layer which is a wide electrode interval Dw, arranged between adjacent wire electrodes, and the first insulation layer arranged in a center part of the detecting portion.

Particulate matter detection sensor

A gas concentration measuring apparatus is provided which works to calculate the concentration of a given gas component with enhanced accuracy. The gas concentration measuring apparatusincludes, a gas sensorand a calculating portion. The gas sensoris equipped with a pump cell, a monitor cell, and a sensor cell. The calculating portionsubtracts a monitor cell current Im that is a current flowing through the monitor cellfrom a sensor cell current Is that is a current flowing through the sensor cellto calculate the concentration of the given gas component in gas g. When calculating the concentration of the given gas component, the calculating portionperforms a correction operation to bring a value of the monitor cell current Im close to a value of an oxygen dependent current Iso that is a component of the sensor cell current Is which arises from the concentration of oxygen.

Gas concentration measuring apparatus

A gas concentration measuring apparatus is provided which works to calculate the concentration of a given gas component with enhanced accuracy. The gas concentration measuring apparatusincludes, a gas sensorand a calculating portionThe gas sensoris equipped with a pump cella monitor celland a sensor cellThe calculating portionsubtracts a monitor cell current Im that is a current flowing through the monitor cellfrom a sensor cell current Is that is a current flowing through the sensor cellto calculate the concentration of the given gas component in gas g. When calculating the concentration of the given gas component, the calculating portionperforms a correction operation to bring a value of the monitor cell current Im close to a value of an oxygen dependent current Iso that is a component of the sensor cell current Is which arises from the concentration of oxygen.

A gas sensing element has at least a sensor cell consisting of a measured gas side electrode positioned in a measured gas chamber, a reference electrode being operative association with the measured gas side electrode, and a solid electrolytic substrate having surfaces on which the measured gas side electrode and the reference electrode are formed. The measured gas side electrode of the sensor cell contains at least one additive selected from the group consisting of Au, Ag, Cu, and Pb by an amount of 0.01 wt % to 2.0 wt % (external wt %) when an overall amount of the measured gas side electrode is 100 wt %.

Gas sensing element

An oxygen sensor element includes a solid electrolyte having cavities on a surface thereof and an electrode formed on the surface of the solid electrolyte. In a method of producing the oxygen sensor element, a solution containing a noble metal compound for nucleus formation is first applied to an electrode forming portion of the solid electrolyte to form a coating film. Then, the coating film is heat-treated to form a nucleus forming portion where noble metal nuclei are deposited. Subsequently, metal plating is applied to the nucleus forming portion to form a plating film deeply entering the cavities. Thereafter, the plating film is burned to form the electrode deeply entering the cavities.

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Kariya, Japan

Toru Katafuchi