Circuit device for monitoring deviation of e.g. power signal of sensor of motor car brake control apparatus, has detector evaluating input signals, and subtractor subtracting local minima from local maxima to calculate signal deviation

摘要

The device has a local maxima detector (1) evaluating an input signal for local maxima and storing a minima value (11) up to presence of new local maxima. A local minima detector (2) evaluates the input signal for local minima and stores a maxima value (12) up to the presence of new local minima. A subtractor (3) subtracts the local minima from the local maxima to calculate a signal deviation (4). A logical gate combines optional status outputs (7, 8) of comparators (5, 6) into a combined signal (9). A threshold value counter (10) forms a threshold value from the minima and the maxima.