Method and apparatus for determining the throttle valve angle

Abstract

A method for determining the throttle valve angle includes determination of the throttle valve position using a throttle valve model from a rate of air flow and a differential pressure across the throttle valve. For reducing the application expenditures and for permitting the throttle valve angle determination also at low differential pressures across the throttle valve, the throttle valve model is determined from an undercritical rate of air flow through the throttle valve, the throttle valve model containing at least two characteristic diagrams, of which the first contains at least two characteristic curves which describe the relationship between the throttle valve angle and the rate of air flow at different differential pressures, and the second characteristic diagram indicates the non-linear transition between the characteristic curves existing in the first characteristic diagram.

Dependencies are inferred from the claim text.