Method and apparatus for correction of a detected faulty actual valve of a signal affected by harmonic vibrations

摘要

PCT No. PCT/EP90/01115 Sec. 371 Date Jul. 13, 1992 Sec. 102(e) Date Jul. 13, 1992 PCT Filed Jul. 9, 1990 PCT Pub. No. WO91/07810 PCT Pub. Date May 30, 1991.An actual value (u(OVS)ixRF) of a signal (ixRF) affected by harmonics may be corrected. A harmonic signal (uiF) superimposed on the signal (ixRF) is generated using a harmonic-free setting signal(uyR), a known pulse pattern ((alpha)1, (alpha)2, ..., (alpha)5) stored in the memory of a modulator, and an equivalent model of the control system. The mean value (u(OVS)iF) of this harmonic signal (uiF) is determined by a second integrating actual value acquisition device. The mean value (u(OVS)iF) is subtracted as a correction value from the actual value (u(OVS)ixRF), which is affected by errors. In this way, an errorfree actual value (u(OVS)ixR) is obtained for a signal (ixRF), the harmonics of which are not filtered out in the actual value determination by means of an integrating actual value acquisition device.