dispositivo de controle de emissão de exaustão para motor de combustão interna

摘要

An object of the present invention is to accurately control an air/fuel ratio and improve an exhaust gas purification rate even in an internal combustion engine that uses an alcohol-containing fuel. An exhaust emission control apparatus for an internal combustion engine of this invention includes: an exhaust gas purification catalyst that is arranged in an exhaust gas passage of the internal combustion engine; an air/fuel ratio sensor that is installed on an upstream side of the exhaust gas purification catalyst and detects an air/fuel ratio of an exhaust gas discharged from the internal combustion engine; air/fuel ratio feedback control means that performs feedback control of the air/fuel ratio of the internal combustion engine based on an output of the air/fuel ratio sensor; and sensor output correcting means that corrects a shift in the output of the air/fuel ratio sensor that is caused by a component included in the exhaust gas. The sensor output correcting means is configured so as to correct a shift in the output of the air/fuel ratio sensor using a lean shift amount of the air/fuel ratio sensor output in accordance with a quantity and/or a proportion of an aldehyde included in the exhaust gas.