US 5,265,594 AGranted

Apparatus for regulating the flow-through amount of a flowing medium

AssigneeSiemens Aktiengesellschaft

InventorsSven-Gunnar Olsson, Goeran Skog, Bo Dahlstroem, Dan Linden, Goeran Cewers, Mats Iderup, Goeran Rydgren

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Abstract

An apparatus, such as a ventilator, for regulating the flow-through amount of a flowing medium, such as a gas, has a valve with a variable orifice operated by a first regulating circuit with negative feedback. The regulating variable generated by the first regulating circuit controls the size of the orifice so that the difference between a desired value and an actual value for the flow-through amount os minimized, toward zero. To achieve rapid changes in the flow-through amount with a high regulating precision, at least one further regulating circuit is provided to which the regulating variable of the first regulating circuit is supplied as the desired value. The actual value for the further regulating circuit may be the measured position of the closure element for the orifice. The bandwidth and the gain can be optimized for each regulating circuit. The energy consumption can be lowered by current recovery and battery operation can be simplified, in the event of a power outage.

Claims28

Dependent claims

An apparatus for regulating the flow-through amount of a flowing medium comprising:

a valve having an input connectable to a source of flowing medium, an output for said flowing medium, a valve opening disposed between said input and said output, and movable closure means for opening and closing said valve by varying the size of said valve opening;
means for calculating a first actual value, corresponding to the actual flow-through amount of said flowing medium through said valve opening;
means supplied with a control signal for controlling the position of said closure means in said valve opening dependent on a characteristic of said control signal;
first regulator means, supplied with a rated value for said flow-through amount and connected to said means for calculating a first actual value to receive said first actual value therefrom, for generating a first regulating variable by negative feedback for use in controlling the position of said closure means so that a difference between said rated value and said first actual value is driven toward zero;
means for calculating a second actual value, corresponding to the actual position of the said closure means in said opening;
second regulating means, supplied with said first regulating variable as a rated value and connected to said means for calculating a second actual value to receive said second actual value therefrom, for generating a second regulating variable by negative feedback for use in controlling the position of said closure means so that a difference between said first regulating variable and said second actual value is driven toward zero;
means for calculating a third actual value, corresponding to an actual value of said control signal characteristic;
and
third regulating means, supplied with said second regulating variable as a rated value and connected to said means for calculating a third actual value to receive said third actual value therefrom and connected to said means for controlling, for generating a third regulating variable forming said control signal for controlling the position of said closure means so that a difference between said second regulating variable and said third actual value is driven toward zero.

6 more elements

An apparatus for regulating the flow-through amount of a flowing medium comprising:

a valve having an input connectable to a source of flowing medium, an output for said flowing medium, a valve opening disposed between said input and said output, and movable closure means for opening and closing said valve by varying the size of said valve opening;
means for calculating a first actual value, corresponding to the actual flow-through amount of said flowing medium through said valve opening;
means for controlling the position of said closure means in said valve opening;
first regulator means, supplied with a rated value for said flow-through amount and connected to said means for calculating a first actual value to receive said actual value therefrom, for generating a first regulating variable by negative feedback for use in controlling the position of said closure means so that a difference between said rated value and said first actual value is driven toward zero;
calculating means for calculating a second actual value, corresponding to the actual position of said closure means in said opening;
means for determining the pressure of said flowing medium and for generating a pressure signal corresponding thereto;
further calculating means, supplied with said rated value for said flow-through amount and with said pressure signal for calculating a weighted value of said flow-through amount dependent on said pressure;
summing means for adding said weighted value and said first regulating variable to obtain a sum signal;
and
second regulating means, supplied with said sum signal as a rated value and connected to said means for calculating a second actual value to receive said second actual value therefrom, for generating a second regulating variable by negative feedback for use in controlling the position of said closure means so that a difference between said sum signal and said second actual value is driven toward zero.

7 more elements

Dependencies are inferred from the claim text.