Exhaust system state determination method and exhaust system state determination device

Abstract

When an internal combustion engine mounted in a vehicle temporarily stops for a prescribed time or longer during an operation of the vehicle and the outside temperature is less than or equal to a prescribed temperature, it is determined that icing has occurred on one of a differential pressure sensor that detects a pressure loss of a gasoline particulate filter provided in an exhaust path of the internal combustion engine, an inlet-side pressure introduction pipe, and an outlet-side pressure introduction pipe, the pressure introduction pipes being paths for introducing a pressure into the differential pressure sensor. Thus, a failure of the differential pressure sensor to output an output signal of a correct value due to icing during the operation of the vehicle can be determined with high accuracy.

Dependencies are inferred from the claim text.