Variable valve-timing engine

摘要

A variable valve-timing engine includes a VTC for adjusting a relative phase angle of an exhaust cam for opening and closing an exhaust valve and an intake cam for opening and closing an intake valve; an oil pressure controlling unit for operating the VTC; a deterioration detecting unit for detecting the deterioration of hydraulic fluid in the oil pressure controlling unit; a correcting unit for correcting the oil pressure of hydraulic fluid of the oil pressure controlling unit based on a detected value by the deterioration detection unit, and a deterioration indicating unit for indicating a replacement of the hydraulic fluid based on the detected value of the deterioration detecting unit, so that the user can be advised of a required oil replacement.