| 摘要 |
In the exhaust pathway (4) of an internal combustion engine (2) to which the present invention is applied, an SCR system (8) is disposed, and a microparticle sensor (14) is disposed downstream therefrom. A control device (16) is provided with a temperature control means for controlling the temperature of an element of the microparticle sensor. Here, the temperature control means starts detection by the microparticle sensor of the amount of microparticles, and then, if the integrated value (t) of the time for which the microparticle sensor was used in a specific operating state has reached a baseline time (t1), performs control that increases the temperature of the element of the microparticle sensor to a first temperature region (T1). Here, the specific operating state is an operating state set taking into consideration the operation states in which urea-related substances are easily discharged downstream of the SCR system (8). Also, the first temperature region (T1) is a temperature higher than the temperature at which urea-related substances break down and below the temperature at which microparticles are eliminated by combustion. |
