Detector for particulate density and filter with detector for pa

Details Detector for particulate density and filter with detector for pa Detector for particulate density and filter with detector for pa

1986-06-03

1987-04-14

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

55283, 55466, 55DIG30, 60311, 73 28, 324 65R, 340628, F01N 302, B01D 4624, G01R 2702

Patent

active

046568328

ABSTRACT:
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.

REFERENCES:
patent: 4158610 (1979-06-01), Bauer
patent: 4283207 (1981-08-01), Martyniuk
patent: 4404795 (1983-09-01), Oishi
patent: 4427418 (1984-01-01), Kogiso
patent: 4442422 (1984-04-01), Murata

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