CONTROL SYSTEM AND CONTROL METHOD FOR ELECTRICAL HEATING CATALYZER

摘要

A control system includes an electrical heating catalyzer, a measuring device and an electronic control unit. The measuring device measures an insulation resistance between a catalyst carrier and case of the electrical heating catalyzer. The electronic control unit determines that the electrical heating catalyzer has a failure when a variation width of the insulation resistance is smaller than or equal to a set value in a historical variation in the insulation resistance measured by the measuring device.

主权项

1. A control system comprising:
an electrical heating catalyzer arranged in an exhaust passage of an internal combustion engine, the electrical heating catalyzer including
a catalyst carrier configured to generate heat through energization,a case configured to accommodate the catalyst carrier, andan electrical insulating member arranged between the catalyst carrier and the case; a measuring device configured to measure an insulation resistance between the catalyst carrier and the case; and an electronic control unit configured to determine whether the electrical heating catalyzer has a failure on the basis of a historical variation in the insulation resistance measured by the measuring device.