Method and apparatus for controlling the working depth of furrow openers for seed drills

摘要

In the method, a sensor scans the ground surface and generates corresponding signals which are evaluated in an evaluation circuit and used to determine the working depth, there being determined from the signals a value which takes account of the clods lying on the ground surface, is characteristic of the ground profile, and corresponds to a value which would be obtained by scanning an ideally levelled ground surface, and the working depth being determined as a function of this characteristic value, the characteristic value being determined on the basis of the signals of the sensor that are detected in a specific interval of time or travel, and the characteristic value being determined by summing up and subsequent averaging of the signals detected in intervals. In order to develop a method or an apparatus of the type mentioned at the beginning in such a way that the seed corns are always deposited at the correct depth in the ground even under the most difficult conditions, it is provided that for the purpose of determining the characteristic value the extremely raised or large clods and the extremely deep gaps between the individual clods are not taken into account, or are filtered out, during averaging. IMAGE