Apparatus and method for controlling operation of reciprocating compressor
AssigneeLG Electronics Inc.
InventorsJae Yoo Yoo, Chel Woong Lee, Min Kyu Hwang
Life of this patent
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Abstract
In an operation control apparatus of a compressor, a current, a voltage an d a TDC, etc. applied to a compressor are detected, a speed and a TDC are constantly controlled so as to place an operation point of the compressor within a high efficiency operation region by using a phase difference between each detected values (for example, a phase difference between the current and the voltage), and an operation frequency is varied according to a load variation, accordingly an operation efficiency of the compressor can be improved.
Claims28
An apparatus for controlling operation of a compressor, comprising:
- a detecting means for detecting a current applied to a compressor and a piston speed of the compressor;
- a phase difference comparing means for comparing phases of the current and the speed and outputting a phase difference;
- an operation frequency determining means for determining a frequency at a certain time point as an operation frequency by increasing/decreasing a reference operation frequency by a certain frequency units according to the phase difference;
- a speed reference value determining means for determining a speed reference value according to the operation frequency outputted from the operation frequency determining means;
- and
- a control means for comparing the speed reference value with the speed detected by the detecting means, applying a control signal according to the comparison result to the compressor and varying an operation frequency of the compressor according to the operation frequency determined by the operation frequency determining means.
An apparatus for controlling operation of a compressor, comprising:
- a detecting means for detecting a current and a voltage applied to a compressor and a TDC (top dead center) through an internal sensor of the compressor;
- a phase difference comparing means for comparing phases of the current and the voltage and outputting a phase difference;
- an operation frequency determining means for determining a frequency at a certain time point as an operation frequency by increasing/decreasing a reference operation frequency by a certain frequency units according to the phase difference;
- a TDC reference value determining means for determining a TDC reference value according to the operation frequency outputted from the operation frequency determining means;
- and
- a control means for comparing the TDC reference value with the TDC detected by the detecting means, applying a control signal according to the comparison result to the compressor and varying an operation frequency of the compressor according to the operation frequency determined by the operation frequency determining means.
A method for controlling operation of a compressor, comprising:
- operating a compressor with a reference frequency;
- determining a speed at an inflection point as a speed reference value after calculating the inflection point by using a phase difference between a piston speed of a compressor and a current applied to the compressor;
- operating the compressor according to the speed reference value;
- and
- varying an operation frequency of the compressor when a load variation occurs and varying the speed reference value according to the varied operation frequency.
A method for controlling operation of a compressor, comprising:
- operating a compressor with a reference frequency;
- determining a TDC (top dead center) at an inflection point as a TDC reference value after calculating the inflection point by using a phase difference between a power voltage and a current;
- operating the compressor according to the TDC reference value;
- and
- varying an operation frequency of the compressor when a load variation occurs and varying the TDC reference value according to the varied operation frequency.
Dependencies are inferred from the claim text.