| 摘要 |
An exhaust gas control apparatus for an internal combustion engine includes an adding mechanism (200), a catalyst (41), and an electronic control unit (80). The adding mechanism (200) is configured to add urea water to exhaust gas. The catalyst (41) is configured to adsorb ammonia generated from the urea water. The electronic control unit (80) is configured to set a target adsorption amount of the ammonia adsorbed on the catalyst (41). The electronic control unit (80) is configured to control the adding mechanism (200) such that the amount of the urea water addition to the exhaust gas is an addition amount calculated based on the target adsorption amount. The electronic control unit (80) is configured to execute an initialization process for decreasing the amount of the ammonia adsorbed on the catalyst (41) to "0" if an integrated value of the amount of the NOx flowing into the catalyst (41) is equal to or higher than a predetermined value. |
