Patent ID: 6966177
Filing Date: 2005-11-22
Classification: F01N,F02D,Y02T

Abstract:
1. An anomaly judgment apparatus for a secondary air supply system which includes a secondary air supply path for introducing secondary air into a portion of an exhaust path of an internal combustion engine located upstream of a catalytic converter disposed in the exhaust path from a portion of an intake path of the internal combustion engine located upstream of a throttle valve disposed in the intake path, comprising: pressure detection means for detecting pressure in the secondary air supply path; anomaly judgment means for calculating pulsation level indicative of the degree of pulsation of pressure detected by the pressure detection means and for judging, on the basis of at least the pulsation level, whether or not the secondary air supply system is anomalous; and anomaly judgment prohibition means for prohibiting judgment by the anomaly judgment means when the degree of propagation of intake air pulsation arising in the intake path into the secondary air supply path is equal to or higher than a predetermined level.