Denso Corporation

Nippon Soken, Inc.

Nagoya University

So-ken Corporation

Hiroo Imamura

Daisuke Makino

Eturo Yasuda

Keigo Mizutani

Satoshi Nakamura

Akira Fujii

Toshitaka Saito

Akio Tanaka

Toshihiro Sakawa

Fumihiko Sato

Takumi Kataoka

Shinya Teranishi

Hidetaka Hayashi

Ryohei Yamamoto

Kengo Toguchi

Masaru Yamada

Takashi Hibino

Ikuna Nishikawa

Katsuya Hirai

Mai Fukui

Tetsuya Hori

Masahiro Nagao

An electrochemical device has an electrochemical cell provided with an electrolyte having proton conductivity, an anode provided on one side of the electrolyte, and a cathode provided on the other side of the electrolyte. The electrochemical device is configured so that a solution containing water, an artificial synthetic resin, and an acid is supplied to the anode. The electrochemical device is configured so that an oxygen-containing gas is supplied to the cathode and connecting a load between the anode and the cathode. The electrochemical device is configured so that the inert gas is supplied to the cathode and connecting the voltage application unit between the anode and the cathode.

Electrochemical device

An air-fuel ratio sensor includes a sensor element inserted through a cylindrical housing for detecting an air-fuel ratio in an atmosphere of unburnt gas, and a measured gas side cover disposed on an end of the cylindrical housing so as to cover the sensor element and defining an inside chamber for storing therein a gas to be measured. The cover has a nested structure composed of a plurality of cup-shaped cover members disposed one inside another, each cover member having a gas inlet hole formed in a side wall thereof and a bottom hole formed in a bottom wall thereof. The gas inlet hole of an innermost one of the plural cover members that directly faces the sensor element is offset from an air-fuel ratio detecting portion of the sensor element toward the housing in an axial direction of the sensor.

Air-fuel ratio sensor

An objective gas is successively introduced into first and second chambers which are connected via a narrow passage. A first monitor cell, provided on a surface of the first chamber, generates an electromotive force representing an oxygen concentration in the first chamber. A second monitor cell, provided on a surface of the second chamber, generates an electromotive force representing an oxygen concentration in the second chamber. A voltage applied to a pump cell is controlled based on the electromotive forces obtained from the first and second monitor cells.

Gas sensing element employable in an exhaust system of an internal combustion engine

A gas sensor has a housing, a gas sensing element held by the housing and having a gas contact portion and an element cover for covering the gas contact portion. The element cover has a double pipe structure formed by layering an outer pipe and an inner pipe. The outer pipe has an outer bottom portion having an outer bottom hole and an outer side portion having plural outer side holes. The inner pipe has an inner bottom portion having an inner bottom hole and an inner side portion having plural inner side holes disposed not to overlap the outer side holes. A spacing D of 0.2-1.0 mm is formed between the outer bottom portion and the inner bottom portion. As a result, flow resistance in the spacing D is relatively high, and the sample gas sufficiently and more smoothly flows toward the gas sensing element. Therefore, the element cover prevents condensed water from entering the inside of the gas sensor and improves response of the gas sensor.

Gas sensor for vehicle engine having a double-pipe cover

PZT piezoelectric ceramics for forming a piezoelectric transformer includes a main composition consisting of Pb [Zr.sub.A Ti.sub.B (Zn.sub.1/3 Nb.sub.2/3).sub.c (Mn.sub.1/2 W.sub.1/2).sub.D ]O.sub.3. When A/B is in a range of 0.92-1.13, C is 0 or larger, D is in a range of 0.02-0.08 and total of A, B, C and D is 1, the piezoelectric transformer is fired at 1,100.degree. C. or lower, while having relatively high voltage rising ratio and efficiency. Therefore, a relatively low-priced Ag--Pd electrode having heat resistance of approximately 1,100.degree. C. can be used as an inside electrode of a laminated-type transformer. Thus, production cost of the piezoelectric transformer is reduced while the transformer has relatively high voltage rising ratio and efficiency.

Piezoelectric ceramics and piezoelectric transformer formed therefrom

Growing community of inventors

Okazaki, Japan

Hiroo Imamura