Patent ID: 7415351

Claim:
A method for determining an angular position signal (φ i ) representing a rotary motion of a rotating part of an internal-combustion engine with a speed sensor ( 11 ) that outputs a rotation-measurement signal (φ mess,i , t mess,i ) representing the rotary motion of a sensing wheel connected to the rotating part, and at least one pressure sensor ( 12 ) that outputs a pressure signal (P Lz,i ) representing a pressure in a combustion chamber, having the following steps: detecting the pressure signal (P Lz,i ), detecting the rotation-measurement signal (φ mess,i , t mess,i ), calculating a correction quantity (Δφ i ) that is a function, at the least, of the detected pressure signal and rotation-measurement signal, determining the angular position signal (φ i ) by linking the detected rotation-measurement signal (φ mess,i , t mess,i ) with the correction quantity (Δφ i ), determining a first energy value ({tilde over (E)} mess,i ) representing an energy of the crankshaft assembly from the rotation-measurement signal (φ mess,i , t mess,i ), determining a second energy value ({tilde over (E)} tat,i ) representing the energy of the crankshaft assembly from the pressure signal (P LZ,i ), and calculating the correction quantity (Δφ i ) as a function of the first and second energy values, wherein the correction quantity (Δφ i ) is calculated as a function of the difference between the first and second energy values.