초록 ▼

A detector for particulate density and the filter for trapping particulates which includes the detector includes a heat resistant insulating member and a pair of electrodes disposed on or within the surface of the filter. When the conductive particulates are attached on the heat resistant insulating

A detector for particulate density and the filter for trapping particulates which includes the detector includes a heat resistant insulating member and a pair of electrodes disposed on or within the surface of the filter. When the conductive particulates are attached on the heat resistant insulating member, the resistance of the member is decreased, and reversely, when the particulates are burned away from the member, the resistance is increased. Therefore, by detecting the resistance variation, the particulate density can be measured accurately and the optimum timing to refresh the filter can be determined. The detector is heat resistive, and also can detect whether the filter is completely refreshed or not. The surface of the heat resistant insulating member may be formed to be irregular so that the particulates are easily attached to the member resulting in an increase in measurement precision. An electric heating means for heating particulates trapped on the filter, is mounted in the detector device in order to eliminate hydrocarbon and water content, thereby stabilizing the resistivity of the particulates. Consequently, detecting particulate density can be utilized more precisely. The controller employs a controlling unit for determining the timing to refresh the filter adequately, by receiving the signals of vehicle conditions such as the particulate density.

대표청구항 ▼

A detector for detecting particulate density of engine exhaust gases, comprising: a heat resistant insulating member means for trapping conductive particulates, the resistance of said heat resistant insulating member means varying in accordance with the amount of trapped conductive particulates; a p

A detector for detecting particulate density of engine exhaust gases, comprising: a heat resistant insulating member means for trapping conductive particulates, the resistance of said heat resistant insulating member means varying in accordance with the amount of trapped conductive particulates; a pair of electrodes disposed opposite to each other in said heat resistant insulating member means, said electrodes being provided for detecting the resistance of said heat resistant insulating member means; and an electric heating means for drying said trapped particulates to allow accurate detection of the resistance of said heat resistant insulating member means.