| 摘要 |
PROBLEM TO BE SOLVED: To suppress a variation in an air-fuel ratio between cylinders and a variation in torque between the cylinders. SOLUTION: An exhaust emission air-fuel ratio of cylinders #1 to #7 for which the acting angle of an intake valve 2 is set to a specified acting angle, for example, to the maximum acting angle is calculated based on output values from an air-fuel ratio sensor 57. Based on the exhaust emission air-fuel ratio, the variation in fuel injection amount between the cylinders is suppressed. Namely, the exhaust emission air-fuel ratio of the cylinders #1 to #4 for which the valve opening characteristics of the intake valve 2 and exhaust valve 3 are set so that the amount of intake air sucked into the cylinders #1 to #4 is not limited based on the valve opening characteristics of the intake valve 2 or an exhaust valve 3 but, for example, limited based on the opening of a throttle valve 56 is calculated and, based on the exhaust emission air-fuel ratio, the variation in fuel injection amount between the cylinders is suppressed. Next the variation in valve opening characteristics between the cylinders is suppressed.
|
