Patent ID: 9212628
Filing Date: 2015-12-15
Classification: F02D,F02M,Y02T

Abstract:
1. An abnormality detection device for an exhaust gas recirculation apparatus that is an abnormality detection device that detects an abnormality in an exhaust gas recirculation apparatus that comprises, in an internal combustion engine having a plurality of cylinders: an EGR passage that, among a first exhaust passage communicating with some cylinders of the plurality of cylinders and a second exhaust passage communicating with other cylinders of the plurality of cylinders, links the first exhaust passage and an intake passage of the internal combustion engine; and an EGR valve mounted in the EGR passage; the abnormality detection device comprising: an intake pressure sensor capable of detecting an intake pressure of the internal combustion engine and a synthesized pulse, an intake pulse of the intake passage and an exhaust pulse of the first exhaust passage being synthesized in the synthesized pulse; extraction means that, based on a difference between a period of the intake pulse and a period of the exhaust pulse, extracts at least one pulse component among a pulse component of a period in accordance with the intake pulse and a pulse component of a period in accordance with the exhaust pulse from an output value of the pressure sensor that detects the synthesized pulse; and detection means that detects an abnormality in the exhaust gas recirculation apparatus based on a size of the at least one pulse component that is extracted by the extraction means.