Patent ID: 7260470
Filing Date: 2007-08-21
Classification: F02D,G01L,G01M

Abstract:
1. A method for calibrating at least two sensors for sensing a variable characterizing a combustion process in an internal combustion engine of a motor vehicle having at least two cylinders, the method comprising: determining at least one operating point of the internal combustion engine; performing, at the at least one operating point of the internal combustion engine, the equalization of the at least two cylinders by the at least one fuel quantity equalization method; mutually adjusting, after the equalization of the at least two cylinders, at least one sensor parameter of the at least two sensors, wherein the variable characterizes the combustion process in a respective cylinder, and wherein the variable represents a pressure; calculating one of torques indicated in the at least two cylinders and mean pressures indicated in the at least two cylinders from the corresponding variables sensed from the at least two sensors; and determining, from one of a difference between the torques and a difference between the mean pressures indicated in the at least two cylinders, one of an erroneous sensor parameter and an erroneous sensor characteristic curve, wherein the adjustment of the at least one sensor parameter is accomplished by one of equating the torques indicated in the at least two cylinders and equating the mean pressures indicated in the at least two cylinders, and wherein the adjustment of the at least one sensor parameter is performed at a single operating point of the internal combustion engine.