Exhaust gas control apparatus for internal combustion engine

摘要

An exhaust gas control apparatus for an internal combustion engine includes: a catalyst that is provided in an exhaust system of an internal combustion engine; a HC adsorption member that is provided in the exhaust system at a position downstream of the catalyst, and that has a function of adsorbing hydrocarbon in exhaust gas; a secondary air supply device that supplies secondary air to the exhaust system at a portion upstream of the catalyst; a supply prohibition unit that prohibits supply of the secondary air when the internal combustion engine is started; and a supply start time control unit that controls the time when supply of the secondary air is started after the internal combustion engine is started based on the amount of hydrocarbon discharged from the internal combustion engine or a value correlated with the amount of hydrocarbon discharged from the internal combustion engine.

主权项

1. An exhaust gas control apparatus for an internal combustion engine, comprising:
a first catalyst that is provided in an exhaust system of the internal combustion engine; an adsorption member that is provided in the exhaust system at a position downstream of the first catalyst, and that has a function of adsorbing hydrocarbon in exhaust gas; a secondary air supply device that supplies secondary air to the exhaust system at a portion upstream of the first catalyst; and an electronic control unit (ECU) programmed to execute control of the exhaust system, the ECU configured to prohibit supply of the secondary air when the internal combustion engine is started, and configured to control a time when supply of the secondary air is started after the internal combustion engine is started based on an amount of hydrocarbon discharged from the internal combustion engine or a value correlated with the amount of hydrocarbon discharged from the internal combustion engine, wherein a hydrocarbon discharge characteristic during start-up of the internal combustion engine reaches a peak shortly after the internal combustion engine is started, and wherein the ECU is further configured to start supply of the secondary air at a time when the exhaust gas, which is discharged from the internal combustion engine at a time when the hydrocarbon having the peak hydrocarbon discharge characteristic is discharged from the internal combustion engine, finishes passing through the adsorption member.