VALVE OPENING/CLOSING TIMING CONTROL DEVICE

To provide a valve opening/closing timing control device capable of enhancing reduction of an exhaust gas and improvement of fuel consumption by using a pressure value measured by an in-cylinder pressure sensor.SOLUTION: A valve opening/closing timing control device includes: a driving-side rotor A; a driven-side rotor B; a control unit 10a for controlling relative rotation phase of the driving-side rotor A and the driven-side rotor B; and a storage unit 10b for storing a pressure value of an in-cylinder pressure sensor Sp. The control unit 10a calculates an indicated mean effective pressure (IMEP) of the pressure value stored in the storage unit 10b, calculates a combustion fluctuation ratio (COV) by dividing standard deviation of IMEP by an average value of IMEP, and permits change of the relative rotation phase when COV is a first prescribed value or less.SELECTED DRAWING: Figure 1 【課題】筒内圧センサで計測された圧力値を用いて、排ガスの低減や燃費の改善を促進することが可能な弁開閉時期制御装置を提供する。【解決手段】駆動側回転体Ａと、従動側回転体Ｂと、駆動側回転体Ａと従動側回転体Ｂとの相対回転位相を制御する制御部１０ａと、筒内圧センサＳｐの圧力値を記憶する記憶部１０ｂと、備え、制御部１０ａは、記憶部１０ｂに記憶された圧力値の図示平均有効圧力（ＩＭＥＰ）を演算すると共に、ＩＭＥＰの標準偏差をＩＭＥＰの平均値で除して求められる燃焼変動率（ＣＯＶ）を演算し、ＣＯＶが第一所定値以下であれば、相対回転位相の変更を許可する。【選択図】図１