Patent ID: 6497228
Filing Date: 2002-12-24
Classification: F02D,F02P

Abstract:
A method for selecting one of first and second cylinder groups of an internal combustion engine, wherein an air/fuel feedback controller causes an air/fuel ratio in said first cylinder group to oscillate about a first predetermined air/fuel ratio at a first frequency, and wherein said air/fuel feedback controller causes an air/fuel ratio in said second cylinder group to oscillate about a second predetermined air/fuel ratio at a second frequency, said method comprising:determining which of said first and second frequencies of air/fuel ratio oscillations in said first and second cylinder groups, respectively, has a greater frequency; and, selecting one of said first and second cylinder groups having said greater frequency of air/fuel ratio oscillations, wherein said selection is made to reduce engine torque fluctuations while changing a frequency of air/fuel ratio oscillations in said selected cylinder group.