In order to become fair the process characteristic (ex. linear/logarithmic), the pistons must accordingly be often adapted. It is by bringing in of v or U-cuts, which are eroded into the pistons. Further for some applications Dither are needed, which make a faster response time possible within the regulation. The Dither is likewise different depending upon valve and application.
All these different characteristics led finally to the consideration to go here the way to uniform electronics which within wide ranges locally parameterized and which can be adapted to respective characteristics.
By the use of fast processors the hydraulic control engineering has a proportional amplifier, which is able to handle today's individual tasks.
The high flexibility in programming makes today a purposeful responsing mode possible, which puts the valve into the position, to react high-dynamically and with a repetition accuracy which was often only possible with servo valves.
Attempts showed that repetition accuracies are possible within pressure pattern curves defined by <0,02% with scanning rates >600Hz.(1) Due to these characteristics DPROP is suitable also for the use in servo hydraulics.
Digital I/Os of the Proprotional amplifier makes a SPS unnecessarily in many cases, because smaller switching tasks and linkages of logic can be likewise taken by this amplifier.
