Patent ID: 7380401
Filing Date: 2008-06-03
Classification: F01N,F02B,F02D,Y02T

Abstract:
1. A method for monitoring a rotational speed of a first and a second charger for an internal combustion engine, comprising: determining a first exhaust lambda value that represents an air ratio of the internal combustion engine associated with a first exhaust section; determining a first rotational speed value that represents the rotational speed of the first charger depending on the first exhaust lambda value determined; regulating the first exhaust lambda value to a predefined first reference value using a first correcting variable; determining the first correcting variable as required for regulation; determining the first rotational speed value depending on the first correcting variable, determining a second exhaust lambda value that represents an air ratio of the internal combustion engine associated with a second exhaust section of the engine; determining a second rotational speed value that represents a rotational speed of the second charger depending on the second exhaust lambda value determined; and comparing the first rotational speed value to the second rotational speed value in order to determine a rotational speed difference.