EXHAUST GAS PURIFICATION SYSTEM

摘要

An exhaust gas purification system for an internal combustion engine includes: an addition valve disposed in an exhaust pipe of the internal combustion engine to add a reducing agent to exhaust gas; a temperature obtaining portion that acquires a temperature of the addition valve; a cooling portion that cools the addition valve by circulating cooling fluid; a determining portion that determines whether the cooling portion is able to normally cool the addition valve; and an output limit portion that limits output of the internal combustion engine based on a heat-resistant temperature of the addition valve and the temperature of the addition valve acquired by the temperature obtaining portion.

主权项

1. An exhaust gas purification system for an internal combustion engine comprising:
an addition valve disposed in an exhaust pipe of the internal combustion engine, the addition valve adding a reducing agent to exhaust gas flowing through the exhaust pipe; a temperature obtaining portion that acquires a temperature of the addition valve; a cooling portion that cools the addition valve by circulating a cooling fluid; a determining portion that determines whether the cooling portion is able to normally cool the addition valve; and an output limit portion that limits output of the internal combustion engine based on a heat-resistant temperature of the addition valve and the temperature of the addition valve acquired by the temperature obtaining portion so that the temperature of the addition valve becomes lower than or equal to the heat-resistant temperature, when the determining portion determines that the cooling portion is not able to normally cool the addition valve while the internal combustion engine is operated.