Method for measuring a sensor signal where extraneous high frequency components are to be filtered out is achieved in a software manner without the need for analogue filters, especially for measuring engine supercharger pressure

摘要

The method uses an electronic filter to remove the superimposed frequencies. The input signal (U1) is sampled at high frequency (2) to generate a sampled signal (U2) that is stored in a memory (4) in sections. A filter (7) is used to packet filter the signal (U2) with a comparatively low frequency (12) when compared with the original sample frequency (U2). The output signal (U5) is pulse free. An Independent claim is made for a device for measuring a signal on which are superimposed extraneous frequencies. Initial high frequency sampling is at around 1000 Hz, while low frequency sampling for the filtering is at around 100 Hz.