Apparatus for controlling controlled systems with dead time
AssigneeSiemens Aktiengesellschaft
InventorsWinfried Speth, Walter Dreiseitl, Klaus Bohm, Lothar Schleicher, Herbert Polster
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Abstract
In controlled systems with dead time, particularly converter current controls, the reference value is fed directly to the final control element providing anticipatory control and, in addition is fed to the reference input of the controller through a dead time simulator. In accordance with a further feature, the difference between the input signal and the output signal of the dead time simulator can be added into the final control element as an additional control variable to compensate for inertia of the controlled system.
Claims7
In an apparatus for controlling a controlled system, including a final control element with dead time, said apparatus including a controller with an integral characteristic, the improvement comprising:
- a. means generating a reference value;
- b. a dead time simulator, the dead time of which corresponds approximately to the dead time of the controlled system, having as in input said reference value and providing an output;
- c. means associated with said control system providing as an output an actual value of the controlled system;
- d. first summing means having as inputs the output of said dead time simulator and said actual value, the output of said summing means being coupled as an input to the controller with an integral characteristic whereby said controller will be supplied with a signal dependent upon the difference between the output signal of the dead time simulator and the actual value signal at its input, the output of said controller being coupled as an input to the final control element of said controlled system.
- e. means coupling said reference value in a bypass path around said dead time simulator and controller so that it forms a further input to the final control element of the controlled system.
Dependencies are inferred from the claim text.