Importance

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Abstract

A process and apparatus for operating a turbocompressor having an output at an actual value of flow and pressure and a blow-off valve for regulating the output to prevent surging of the output above a surge limit and to prevent a reduction of the output below a minimum value, with a comparing unit for measuring the actual value, and a controller unit for controlling the blow-off valve in accordance with the output of the comparing unit comprising, forming a first difference value between the theoretical value and the actual value, forming a delayed value from the difference value and thereafter forming a second difference value between the delayed value and the first difference value to control the blow-off valve. The apparatus for effecting the process comprises summing units for forming the various difference values, a delay unit for delaying the first difference value and, in one embodiment, a limiter unit for limiting the second difference value which is thereafter added to the theoretical value before the resulting value is applied to the controller unit for controlling the blow-off valve.

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First Claim