Abstract: Various embodiments of the teachings herein include a cold exchange system. An example includes: thermal energy exchangers connected to a refrigerant pipe system; and a control system comprising: an orifice adjusting system including a valve and an actuator, the valve comprising a flow chamber with an adjustable orifice in the pipe; a position sensor to sense a position of the adjustable orifice and/or the actuator and generate a signal indicative of the sensed position; and a controller. The orifice adjusting system adjusts the adjustable orifice in response to a control signal. The control system uses a software-wise change of a characteristic curve of the orifice adjusting system. The position sensor operates using a static measurement principle. The controller compares the signal to a set position of the adjustable orifice and generates the control signal based on the comparison.

Abstract: Disclosed is an optimizing method for regulating the operating state of a guided machine tool having a tool rotating at a certain speed and subjected to a percussion frequency during a boring action, in which the tool, subjected in addition to a force, is driven into an object of a given material.

Abstract: Control apparatus for a horizontal boring tool is described which drives a boring lance via boring rods. The tool includes an input interface for receiving actual values of controlled variables of the horizontal boring tool, and an output unit for issuing control signals for controlling the horizontal boring tool. Between the input interface and the output unit is provided a fuzzy control unit which determines the control signals for activation of the horizontal boring tool from the actual values of the controlled variables and the desired values for the controlled variables by fuzzy logic while taking into account heuristic process values. The control apparatus permits automatic operation of the horizontal boring tool with good course steering and high precision.

Abstract: Disclosed is an optimizing method for regulating the operating state of a guided machine tool having a tool rotating at a certain speed and subjected to a percussion frequency during a boring action, in which said tool, subjected in addition to a force, is driven into an object of a given material.