Patent ID: 8935076
Filing Date: 2015-01-13
Classification: F01L,F02D

Abstract:
1. A controller for an internal combustion engine, the internal combustion engine including: a rotational phase difference changing mechanism that changes a rotational phase difference of a camshaft with respect to a crankshaft; a grooved guide passage that is formed on a portion of a peripheral surface of the camshaft; a guided member that is able to be engaged with or disengaged from the grooved guide passage; an operating member, connected to the guided member, that is displaced back and forth in a direction parallel to an axial direction of the camshaft through a relative displacement of the guided member when the guided member is engaged in the grooved guide passage, the relative displacement being caused by the rotation of the camshaft and a shape of the grooved guide passage; a valve operating characteristic changing mechanism that changes operating characteristics of a valve with respect to the rotation of the camshaft through the relative displacement of the operating member; and an actuator that receives an input command signal to drive the guided member to thereby engage the guided member with the grooved guide passage, the the controller comprising: an ECU configured to: calculate a rotational position of the crankshaft; calculate a rotational phase difference of the camshaft with respect to the crankshaft, the rotational phase difference being changed by the rotational phase difference changing mechanism; output a command signal to the actuator when the operating characteristics of the valve are changed and that determines a timing, at which the command signal is output to the actuator, on the basis of the rotational position of the crankshaft; and correct the timing, at which the command signal is output on the basis of the rotational phase difference of the camshaft with respect to the crankshaft.