Honda Motor Co., Ltd.

Ngk Insulators, Inc.

Honda Giken Kogyo Kabushiki Kaisha

Nippon Leakless Industry Co., Ltd.

Masanobu Miki

Keizo Iwama

Takeshi Sakuma

Kenji Dosaka

Atsuo Kondo

Tatsuya Okayama

Takashi Egami

Masaaki Masuda

Yasumasa Fujioka

Hidetaka Ozawa

Makoto Hattori

Masahiro Tokuda

Yukio Miyairi

Tatsuhiko Hatano

Takayuki Sakurai

Shoji Yokoi

Yoshiyuki Nakanishi

Akira Tanaka

Yasunori Murakami

Kazuhide Terada

Koichi Nakajima

Shinya Ishimaru

Yuuichiro Imanishi

Yoshimichi Kurashina

A particulate matter detection device of the present invention includes a plate-like element base material, and a pair of measurement electrodes arranged in the element base material, each of the measurement electrodes is a combteeth-like electrode including a plurality of planarly arranged combteeth portions, and a comb spine portion which connects the plurality of combteeth portions of each of the measurement electrodes to one another at one end of each of the plurality of combteeth portions, the combteeth portions of the measurement electrodes are arranged to engage with each other with a space being left therebetween, and the comb spine portion of at least one of the measurement electrodes is covered with a comb spine covering portion made of a dielectric material.

Particulate matter detection device

The apparatus is provided with an abnormality determination means for determining abnormality of the apparatus where two different combinations of two electrodes are selected from the three electrodes, an alternating-current voltage is applied to an electrode in one combination by the voltage-applying portion to measure a value of a current flowing to the other electrode via the dielectric body by electrostatic coupling, an alternating-current voltage is applied to an electrode in another combination out of the at least two different combinations by the voltage-applying portion to measure a value of a current flowing to the other electrode via the dielectric body by electrostatic coupling, and an abnormality of the apparatus is determined from the current values measured.

Apparatus with abnormality determination function and method for determining abnormality

A particulate matter detection device includes a plate-like element base material including, on one surface thereof, a formed recess portion to collect a particulate matter; a pair of measurement electrodes arranged on the bottom surface side of the recess portion of the element base material; and a high-voltage dust collection electrode embedded in a wall which forms the recess portion of the element base material on the one surface side of the element base material from a position where the pair of measurement electrodes are arranged. An electric field is generated from the high-voltage dust collection electrode to the pair of measurement electrodes, to collect, on the bottom surface side of the recess portion, the particulate matter flowing along the element base material, and a change of electric characteristics between the pair of measurement electrodes is measured to detect the particulate matter collected on the recess portion.

The particulate matter detection device of the present invention is a particulate matter detection deviceincluding an electrode portionand detection meansfor detecting an electrical characteristic of the electrode portion, whereby a particulate mattercontained in an exhaust gasis detected on the basis of a change of the electrical characteristic due to the particulate matterattached to the electrode portion. The particulate matter detection device ifurther includes removal meansand abnormality judgment meansfor comparing an initial electrical characteristic in a use initial state of the device with the electrical characteristic measured in a state where the particulate matterattached to the surface of the electrode portionis removed by the removal means, to judge whether or not the particulate matter detection device ihas an abnormality.

Particulate matter detection device and inspection method of the particulate matter detection device

A PM sensor is provided having high responsiveness and capable of long term detection. A PM sensor includes a sensor element that has particulate collection electrodes to which a particulate collection voltage for causing particulate matter contained in exhaust to adhere to a sensor element is applied, and measurement electrodes to which a measurement voltage for measuring an electrical characteristic of the sensor element is applied, in which, after a particulate collection voltage is applied to the particulate collection electrodes application of the particulate collection voltage is stopped in response to a predetermined condition being satisfied, the measurement voltage is applied to the measurement electrodes and the electrical characteristic of the sensor element is measured.

A particulate matter detection deviceincludes a first electrodewhose one surface is covered with an inter-electrode dielectric material; a second electrodedisposed on the side of the one surface of the first electrode, to perform the discharge of electricity by a voltage applied between the first electrodeand the second electrode; and a pair of measurement electrodesdisposed on the surface of the inter-electrode dielectric materialso as to face each other; characteristic measurement meansfor measuring electric characteristics between the pair of measurement electrodesand; and particulate matter amount calculation meansfor obtaining the amount of the particulate mattercollected by the surface of the inter-electrode dielectric material, based on the change amount of the electric characteristics.

A plasma generating electrode includes two types of plate-shaped unit electrodes of different polarities, the two types of unit electrodes of different polarities being hierarchically and alternately stacked at specific intervals, a discharge space for generating plasma being formed between the opposing unit electrodes, each of the unit electrodes of one polarity among the two types of unit electrodes of different polarities including a plate-shaped conductor exhibiting conductivity and a ceramic dielectric disposed to cover the conductor, the ceramic dielectric of the unit electrode of one polarity including a support protrusion for forming the discharge space for generating plasma between the opposing unit electrodes and at least a part of a space in which the unit electrode of the other polarity is disposed opposite to the unit electrode of one polarity and for supporting the unit electrode of one polarity, the support protrusion being integrally formed with the ceramic dielectric on at least one surface of the ceramic dielectric on at least one end of the ceramic dielectric in one direction.

Plasma generating electrode and plasma reactor

A plasma generating electrodeof the invention includes at least a pair of electrodes, at least one electrodeof the pair of electrodesincluding a plate-like ceramic bodyas a dielectric and a plurality of conductive filmsdisposed in the ceramic bodyand each having a plurality of through-holesformed through the conductive filmin its thickness direction in a predetermined arrangement pattern, the through-holeshaving a cross-sectional shape including an arc shape along a plane perpendicular to the thickness direction, an arrangement pattern of the through-holesformed in at least one conductive filmbeing different from an arrangement pattern of the through-holesformed in the other conductive film. The plasma generating electrodeis capable of simultaneously generating different states of plasma upon application of voltage between the pair of electrodesdue to the different arrangement patterns of the through-holesin the conductive films

Plasma generating electrode, plasma generation device, and exhaust gas purifying device

A plasma generating electrode of the invention present includes at least a pair of electrodesat least one electrodeof the pair of electrodesincluding a plate-like ceramic bodyas a dielectric and a conductive filmdisposed inside the ceramic plateand having a plurality of through-holesformed through the conductive filmin its thickness direction, the through-holes having a cross-sectional shape including an arc shape along a plane perpendicular to the thickness direction. The plasma generating electrode can generate uniform and stable plasma at low power consumption.

In an exhaust gas purifying technique in which discharge is utilized, the invention provides a technique in which purification efficiency can be enhanced while an increase in electric power consumption is suppressed. A discharge mode including a discharge period and an undischarged period is adopted in a configuration in which a plasma process is performed to exhaust gas from a Diesel engine by generating the discharge in a plasma generator. A basic waveform periodically exists in a repeated manner in the discharge period, and the discharge is not performed in the undischarged period. An amplitude and/or a period of the basic waveform is controlled according to a load on the Diesel engine, a continuous iteration count of the basic waveform is controlled according to purification reaction efficiency in the plasma process, and the burst period is controlled according to an exhaust gas flow rate.

Exhaust gas purifying apparatus

A system for purifying an exhaust gas includes a plasma unit and a catalyst unit. The plasma unit generates energetic plasma species which react with particulate matters and nitrogen oxides contained in the exhaust gas. The catalyst unit has a catalyst which reacts with the exhaust gas. The plasma unit is disposed upstream relative to the catalyst unit in a direction of flow of the exhaust gas and the system provides sequential purification for the particulate matters and the nitrogen oxides.

System and method for purifying an exhaust gas

An exhaust gas purification system equipped, from an upstream side toward downstream side through which an exhaust gas flows, with a plasma reactor and a catalyst unit charged with a catalyst acting on NOin the exhaust gas in this order, and equipped with a reducing agent supplying device to supply a reducing agent at an upstream side of the plasma reactor, wherein the catalyst has an NOadsorptive catalyst layer and an NOselective reduction catalyst layer contacting the NOadsorptive catalyst layer.

Exhaust gas purification system

Provided is a gasket capable of maintaining a high sealing property under a high temperature, in which a gasket basic substance and coverture are not sublimated or decomposed when the gasket is used under a high temperature above 500&#xb0; C. The gasket for a high-temperature joint includes a gasket basic substance formed by filling a heat-resistant filler mainly composed of diatomaceous earth into gaps of a meshed metallic reinforcing member, and coverture made of a heat-resistant antifriction material mainly composed of a mixture of boron nitride and polytetrafluoroethylene resin for covering a surface of the gasket basic substance.

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Wako, Japan

Masanobu Miki