| 摘要 |
<p>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, a full-cylinder operation determination threshold, which is set on the basis of the high-order intensity SP2 and the primary intensity SP1, and a reduced-cylinder operation determination threshold are compared, and it is determined whether or not intake valves 3 and exhaust valves 4 of all cylinders 2 are valve-opened, and whether or not the exhaust valve 4 is valve-opened on the basis of these comparison results.</p> |
