Patent ID: 8701394

Claim:
An electrically heated catalytic device provided in an exhaust pipe, comprising: an outer casing; an electrically heated catalyst that includes an energization-exothermic substrate that is formed of a material that generates heat through energization, allows exhaust gas to flow therethrough, and is so retained in the outer casing as to allow energization from an outside in a state of being insulated from an inner wall of the outer casing; and a metal catalyst carried on the energization-exothermic substrate; and a heater ring that is made of an insulating material, on a surface of which soot that has entered the outer casing together with exhaust gas is deposited so that the heater ring functions as a barrier, wherein the heater ring has a ring hole that penetrates a center of the ring and that serves as an exhaust gas passage, and wherein the heater ring is disposed on an upstream side of the electrically heated catalyst with respect to the exhaust pipe in a state of being in contact with an outer peripheral edge portion of an upstream end face of the substrate; wherein the heater ring eliminates soot in exhaust gas, which is deposited on the heater ring, through combustion by heat which is generated in the substrate through energization, and which is transferred to the heater ring.