Patent ID: 8604811
Filing Date: 2013-12-10
Classification: B01D,F01N,Y02A,Y02T

Abstract:
1. An electrical heating catalyzer comprising: a honeycomb structure having a base material made of conductive ceramic and a plurality of pairs of electrodes in the base material of which each pair is provided apart from one another; an energizer for energizing each of a plurality of current paths formed by the plurality of electrodes in the base material, to heat the base material; a detector for detecting a path-specific current that flows when a predetermined voltage is applied or an inter-electrode resistance in the base material, for each of the plurality of current paths; a comparator for comparing the path-specific current or the inter-electrode resistance detected by the detector for each current path; and an energization controller for controlling an energization timing of each current path based on a comparison result which is compared by the comparator; wherein: the base material is made of a ceramic having negative temperature coefficient characteristics; the detector is configured to detect the path-specific current or the inter-electrode resistance at a heating-start timing at which heating of the base material is started; and the energization controller is configured to control an energization-start timing of each current path such that, among the plurality of current paths, a current path having a smaller path-specific current at the heating-start timing is energized first and a current path having a larger path-specific current is energized later, or a current path having a larger inter-electrode resistance at the heating-start timing is energized first and a current path having a smaller inter-electrode resistance is energized later.