Device for controlling internal combustion engine

摘要

In the present invention, a microparticle sensor (8) is installed in an exhaust path (4) of an internal combustion engine (2). A device (10) for controlling the internal combustion engine (2) detects the microparticle content of the exhaust gas in the exhaust path (4) according to the output of the microparticle sensor (8). In a first period, the device (10) for controlling the internal combustion engine (2) impresses a collection voltage for collecting microparticles between electrodes of the microparticle sensor, and forms a microparticulate layer on the surface of the electrodes. The state in which the particulate layer is formed is maintained during a second period. "The state in which the particulate layer is formed is maintained" connotes maintaining the state in which the particulate layer is formed as well as prohibiting a control for removing the particulate layer.