Patent ID: 8220316
Filing Date: 2012-07-17
Classification: F02D,Y02T

Abstract:
1. A method for determining an alcohol concentration of fuel fed to combustion in a motor vehicle after filling a fuel tank of a fuel system with either a first fuel type of a first predetermined alcohol concentration or a second fuel type of a second predetermined alcohol concentration, the method comprising: prior to having determined whether the filled fuel type is the first fuel type or the second fuel type: determining whether the filled fuel type is the first fuel type or the second fuel type, based on the dynamically adapted first and second corridors, changes to a lambda value measured by a sensor, an alcohol concentration of the fuel tank before filling, and volumes of the fuel tank before and after filling; and in response to determining whether the filled fuel type is the first fuel type or the second fuel type, considering only the corridor corresponding to the determined filled fuel, and ignoring the other corridor, for a subsequent evaluation of measured lambda values.