METHOD AND DEVICE FOR DETERMINING A ROTATIONAL ANGLE POSITION OF A CRANKSHAFT OF AN INTERNAL COMBUSTION ENGINE

The invention relates to a method for determining a torsion value, particularly a rotational angle position (θ, θ1) of a shaft (17), particularly a crankshaft (17') of an internal combustion engine (112), which is coupled, in a direct or geared manner, to an electrical machine (30) comprising a rotor (32) and a stator (33) with at least two phase windings (U, V, W) from each of which at least one phase signal (UU, UV, UW, lU, lV, lW) is derived, the phase signals (UU, UV, UW, lU, lV, lW) each having rising edges (FlUu, FlVu, FlWu), falling edges (FlUd, FlVd, FlWd) and/or zero crossings (FlU0, FlV0, FlW0), and a sum signal (USum), comprising a plurality of phase signals (UU, UV, UW, lU, lV, lW) of the electrical machine (30), being produced such that a characteristic pulse (Pf1, Pf2, Pf3, Pr1, Pr2, Ρr3) in the sum signal (USum) is respectively associated with the rising edges (FlUu, FlVu, FlWu), falling edges (FlUd FlVd, FlWd) and/or zero crossings (FlU0, FlV0, FlW0), the pulses (Pf1, Pf2, Pf3, Pr1, Pr2, Ρr3) being used to determine the rotational speed (n), the rotational angle position (θ, θ1) or the direction of rotation (α+, α-) of the rotor (32). The invention also relates to a device for producing a sum signal (Usum) from a plurality of phase signals (UU, UV, UW, lU, lV, lW), which is used to determine a rotational speed (n) of a shaft (17), to a corresponding arithmetic unit designed to carry out the method, and to a computer program for carrying out the method.