| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylinder deactivation state determination device which can further accurately determine a deactivation state of a cylinder.SOLUTION: Intake pressure at which an intake stroke is consecutively performed at a prescribed crank angle is spectra-analyzed, primary intensity SP1, which is the intensity of a primary frequency component corresponding to a crank angle of the integral multiplication of the prescribed crank angle, and high-order intensity SP2, which is the intensity of a high-frequency component corresponding to the prescribed crank angle, are calculated, and it is determined whether or not intake valves 3 and exhaust valves 4 of all cylinders 2 are valve-opened on the basis of a relative relationship between the primary intensity SP1 and the high-order intensity SP2. |
