CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

PURPOSE: To secure discharging capacity of an oil pump by idling up to a minimum necessity by keeping rotational frequency of an engine higher compared with normal idling rotational frequency after starting an internal combustion engine till engine oil pressure reaches determined value. CONSTITUTION: Rotational frequency of an engine right after starring an internal combustion engine is controlled by an electronic control unit (ECU) 30 based on sensor output of a hydraulic sensor 26 and condition of an ignition switch 32. When the starting of the internal combustion engine is detected, then, the rotational frequency of the internal combustion engine is maintained higher as compared with normal idle rotational frequency by an engine rotational frequency rising means until engine oil pressure of determined value or more is detected. In this case, large drive force is given to an oil pump 18 actuated by a part of the output of the internal combustion engine as drive source until the engine oil pressure actually rises. After the engine oil pressure reaches the determined value, it is controlled to the normal idle rotational frequency and the high rotational frequency is not excessively maintained.