Patent ID: 7716916
Filing Date: 2010-05-18
Classification: F02D

Abstract:
1. A method for controlling a fuel mixture provided for an internal combustion engine generating a flue gas stream by combusting the mixture, the engine comprising a catalytic converter arranged in the flue gas stream and a lambda probe arranged downstream of the converter relative to the fuel gas stream for providing post-cat sensor signals, the method comprising: detecting a post-cat sensor signal by the lambda probe; acquiring a subsequent post-cat sensor signal chronologically succeeding the post-cat sensor signal by the lambda probe; generating a comparative value by comparing the acquired subsequent post-cat sensor signal to the detected post-cat sensor signal; changing the mixture if the comparative value is greater than or equal to a predetermined value; and generating a number of chronologically succeeding comparative values by repeating the detecting and the acquiring steps, and checking a trend of the succeeding comparative values.