Patent ID: 9217383
Filing Date: 2015-12-22
Classification: F02D

Abstract:
1. A method for a vehicle, comprising: determining imbalance values for cylinders of an engine based on samples of an exhaust gas oxygen signal generated using an exhaust gas oxygen (EGO) sensor; determining an offset value that relates one of the imbalance values with one of the cylinders; determining a fueling correction for the one of the cylinders based on the one of the imbalance values; selectively adjusting fueling to the one of the cylinders based on the fueling correction; re-synchronizing the imbalance values with the cylinders, respectively, in response to generation of a first indicator; incrementing a counter value when the fueling correction is equal to one of a first predetermined value and a second predetermined value and was previously equal to the other one of the first and second predetermined values, wherein the first and second predetermined values are different; and selectively generating the first indicator when the counter value is greater than a third predetermined value, wherein the third predetermined value is an integer greater than zero.