Patent ID: 7797924
Filing Date: 2010-09-21
Classification: F01N,Y02T

Abstract:
1. An abnormality diagnosis apparatus for a secondary air supply system for an internal combustion engine, the system including an air pump for supplying secondary air into an upstream of a catalyst in an exhaust gas passage of the internal combustion engine, the catalyst purifying exhaust gas, and the air pump being driven by an electric motor, the apparatus comprising: a secondary air detector that detects secondary air information; an abnormality diagnosis section having a configuration that performs an abnormality diagnosis of the secondary air supply system in accordance with the secondary air information; a temperature information determining section having a configuration that performs at least one of detection and estimation of air pump temperature of the air pump driven by the electric motor; and a condition setting section having a configuration that performs at least one of setting and compensating a condition for evaluating normality and abnormality of the secondary air supply system in accordance with the air pump temperature; wherein the abnormality diagnosis section performs the abnormality diagnosis by comparing the secondary air information with the condition set or compensated by the condition setting section.