CONTROL DEVICE FOR VARIABLE VALVE MECHANISM

摘要

A brushless motor (47) of a variable valve mechanism (14) varies a actuation parameter of an intake valve (9) of an engine (1). A position sensor (S4, S5) outputs a pulse signal when the brushless motor (47) rotates. A position counter (P) calculates a counter value by counting edges of the pulse signal. A motor control device (50) obtains a detection value (¸d) of a motor rotational angle (¸) based on the counter value when the motor control device (50) is in a powered state. An engine control device (51) determines that the detection value (¸d) of the motor rotational angle (¸) is displaced from the actual value (¸r) when the engine control device (51) detects that the engine (1) is operating and the motor control device portion (50) is in a non-powered state.