Patent ID: 6912995
Filing Date: 2005-07-05
Classification: F01L,F02D,F02M,Y02T

Abstract:
1. A control apparatus for an internal combustion engine having two cylinder groups and two variable valve control mechanisms provided to the respective cylinder groups and capable of varying valve lift characteristics of intake valves and thereby varying an intake air quantity for each of the cylinder groups independently and continuously, comprising: a detecting section that detects an incylinder pressure of each cylinder of the engine; a comparing section that compares a combustion stability of one of the two cylinder groups with a combustion stability of the other of the two cylinder groups when the engine is in an operating condition in which an intake valve opening timing and an exhaust valve closing timing overlap each other and an intake valve closing timing is set at a point prior to bottom dead center and when a difference in an average incylinder pressure between the two cylinder groups is larger than a predetermined value; and a control section that controls the variable valve control mechanisms in accordance with a result of comparison by the comparing section; the control section being configured to vary the valve lift characteristics of intake valves of one of the two cylinder groups which is larger in the average incylinder pressure than the other of the two cylinder groups so that intake air quantities for the respective cylinder groups become equal to each other.