| 摘要 |
In an exhaust gas recirculation control apparatus for an internal combustion engine, an outward opening type exhaust gas recirculation (EGR) valve (63) arranged so that an exhaust gas pressure acts in a closing direction thereof is provided in an EGR passage (62) of the internal combustion engine (1). The EGR valve is driven for opening and closing by a stepping motor (64) which is driven and controlled by an electronic control apparatus (51). The electronic control apparatus (51) estimates a magnitude of a difference between an intake negative pressure and a back pressure acting on the EGR control valve (63) based on an output of an intake pressure sensor (37), and varies the driving speed of the stepping motor (64) when the EGR control valve (63) opens from its fully closed position in accordance with a magnitude of the pressure difference. <IMAGE> |
