Electronic control system for a work implement

Claim 1

A tractor control system for a work implement, said control system having an electronic circuit utilizing an analog/digital technique and including an analog/digital control unit and means for measuring a factor dominating the performance of an actuator and providing a first signal representing the actual value of said control system, a second signal representing a set point value, and a third signal in analog form representing the difference between the values of said first and second signals, said difference constituting the control deviation for governing said analog/digital control unit, said unit for controlling said actuator, said control system comprising converting means for converting said third signal to digital form by sampling means for sampling at a sampling frequency f o to establish a dead range in a time dimension, said sampling means providing pulses, signals supplied to said converting means being first in analog form and being converted to digital signals in establishing a first dead range in a time dimension whereby said control system transfers and processes digital information; and comparator means for processing said digital signal, said comparator means including an output, limit value comparators having limit values defining said dead range set therein, whereby when the amplitude of the pulses established by said sampling falls outside said dead range at least one time, said sampling means provides a transition to continuous following of the control deviation, thereby performing a requisite control so that when the value of a fourth signal derived from said control deviation falls into said dead range said sampling is repeated, a digital logic circuit connected to the output of said comparator means, means for supplying switch data to said digital logic circuit thereby enabling said digital logic circuit to determine whether a control measure suggested by said control system may be carried out, said comparator means comprising a sensitivity setting comparator and a setting unit connected to said sensitivity setting comparator for setting the limits of said dead range.