Patent ID: 7032550
Filing Date: 2006-04-25
Classification: F01L,F02D,Y02T

Abstract:
1. An inter-cylinder variation detection device of an internal combustion engine comprising: a valve opening characteristic setting means for changing an operating angle and/or amount of lift of an intake valve, wherein the valve opening characteristic setting means can set a first valve opening characteristic and a second valve opening characteristic having a smaller operating angle or amount of lift than that at the time of the first valve opening characteristic, and further a calculating means for detecting an indicator of the state of combustion in each cylinder at the time of the first valve opening characteristic and the time of the second valve opening characteristic set by said valve opening characteristic setting means and, at the same time, calculating the deviation between these indicators and a standard value for each cylinder and a detecting means for detecting the variation among cylinders by using the deviation for each cylinder at the time of the first valve opening characteristic and the deviation for each cylinder at the time of the second valve opening characteristic calculated by said calculating means.