Ngk Insulators, Inc.

Honda Motor Co., Ltd.

Takashi Egami

Takeshi Sakuma

Atsuo Kondo

Masahiro Tokuda

Keizo Iwama

Masanobu Miki

Tatsuya Okayama

Hidetaka Ozawa

Makoto Hattori

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

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.

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 device () includes a first electrode () that includes a conductive section () and a dielectric () that covers the conductive section (), and a second electrode () that is disposed opposite to the first electrode () at an interval of 0.3 to 3.0 mm. Charged particulate matter contained in a fluid that passes through the space between the first electrode () and the second electrode (), or particulate matter that is contained in a fluid and charged by a discharge that occurs due to application of a voltage between the electrodes () and () is electrically adsorbed on at least one of the electrodes () and (), and the particulate matter adsorbed on the electrodes () and () is detected by measuring a change in electrical properties of the first electrode (), or a change in electrical properties of the electrodes () and ().

A tubular structure for fixing a particulate matter detection device including a tubular first holding tube having a fixing structure portion at a first end; and a tubular second holding tube having one end fixed to a second end so that the second holding tube is coaxial with the first holding tube. The particulate matter detection device is prolonged in one direction and having a detecting portion for particulate matter, with a takeout portion of a wiring line disposed in the tubular structure so that the detecting portion projects to the outside from the first end and so that the takeout portion is positioned in the second holding tube, and with the particulate matter detection device fixed to a pipe by the fixing structure portion so that the detecting portion is positioned in the pipe.

Tubular structure for fixing particulate matter detection device

A particulate matter detection device including a first electrode having one surface covered with a dielectric material; a second electrode which is disposed on the side of the one surface of the first electrode via a space where a gas including particulate matter flows and which performs one or both of the formation of a discharge and an electric field by a voltage applied between the first electrode and the second electrode; a pair of measurement electrodes disposed on the surface of the dielectric material so as to face each other; and a protective film disposed on the surfaces of the pair of measurement electrodes and having a volume resistivity of 10 &#x3a9;cm to 10&#x3a9;cm, where the variate of the electric properties between the pair of measurement electrodes is measured, and the amount of the collected particulate matter can be obtained.

A particulate matter detection device including a detection device main body which has one end provided with a through hole a pair of electrodes embedded in a wall through which the through hole is formed, and covered with a dielectric material; wires extending from the electrodes to the other end of the main body; and a ground electrode provided at a position sandwiched between the wires. The device can electrically adsorb, on the wall surface of the through hole, a charged particle in a fluid flowing into the through hole, or a particle charged by electric discharge caused in the through hole by applying a voltage across the pair of electrodes. The device can measure the changes of the electric properties of the wall through which the through hole is formed, thereby detecting particles adsorbed on the wall surface of the through hole.

Particulate matter detection device and method for manufacturing the same

A particulate matter detection device () includes a detection device body () extending in one direction and having at least one through-hole () that is formed at one end (), at least one pair of electrodes buried in the wall of the body () that defines the through-hole (), and covered with a dielectric, lines respectively extending from the pair of electrodes toward the other end (), a takeout lead terminal () of one electrode of the pair of electrodes disposed on the surface of the other end (), a takeout lead terminal () of the other electrode of the pair of electrodes between one end () and the other end (), and an electric wire () provided with an electric wire securing member () at its tip portion, and bonded to the takeout lead terminal () through the electric wire securing member ().

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.

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Nagoya, Japan

Takashi Egami