Determining device and a method for determining a failure in a motor compressor system
First Claim
1. A failure determining apparatus for a motor driven compressor system having a compressor and a motor for driving the compressor, comprising:
- mass flow detecting means adapted to be coupled to said compressor for sensing fluid mass flow related to said compressor;
compression ratio detecting means adapted to be coupled to said compressor for detecting a compression ratio of said compressor;
reference value generating means coupled to at least one of said mass flow detecting means and said compression ratio detecting means, said reference value generating means generating at least one of variable upper and lower current reference values in response to an output of said at least one of mass flow detecting means and compression ratio detecting means, whereby said variable upper and lower current reference values are responsive to variable operating conditions of said compressor; and
failure determining means coupled to said reference value generating means and adapted to be coupled to said motor for detecting motor current value above or below said variable upper or lower current reference value, whereby a failure in the compressor system is detected.
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Abstract
A determining device for determining a failure in a motor compressor system, comprising a current detecting sensor for detecting a current input to a motor for driving a compressor, a mass flow sensor for detecting mass flow of compressible fluid sucked into the compressor, a compression ratio detecting sensor for detecting a compression ratio of the compressor, a reference value generating unit for generating a limit reference value for determining whether or not a failure in the motor compressor system has occurred by comparing the current detected by the current detecting sensor with the limit reference value, and a failure determining unit for determining that a failure in the motor compressor system has occurred when the current is beyond the limit reference value. The limit reference value is increased in accordance with an increase of the mass flow or an increase of the compression ratio.
60 Citations
17 Claims
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1. A failure determining apparatus for a motor driven compressor system having a compressor and a motor for driving the compressor, comprising:
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mass flow detecting means adapted to be coupled to said compressor for sensing fluid mass flow related to said compressor; compression ratio detecting means adapted to be coupled to said compressor for detecting a compression ratio of said compressor; reference value generating means coupled to at least one of said mass flow detecting means and said compression ratio detecting means, said reference value generating means generating at least one of variable upper and lower current reference values in response to an output of said at least one of mass flow detecting means and compression ratio detecting means, whereby said variable upper and lower current reference values are responsive to variable operating conditions of said compressor; and failure determining means coupled to said reference value generating means and adapted to be coupled to said motor for detecting motor current value above or below said variable upper or lower current reference value, whereby a failure in the compressor system is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A failure determining apparatus for a motor driven compressor system having a compressor and a motor for driving the compressor, comprising:
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a mass flow detector adapted to be coupled to said compressor and sensing fluid mass flow related to said compressor; a compression ratio detector adapted to be coupled to said compressor and detecting a compression ratio of said compressor; a reference value generator coupled to at least one of said mass flow detector and said compression ratio detector, said reference value generator generating at least one of variable upper and lower current reference values in response to an output of said at least one of mass flow detector and compression ratio detector, whereby said variable upper and lower current reference values are responsive to variable operating conditions of said compressor; and a failure detector coupled to said reference value generator and adapted to be coupled to said motor, said failure detector detecting motor current value above or below said variable upper or lower current reference value, whereby a failure in the compressor system is detected. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for determining a failure in a motor driven compressor system having a compressor and a motor for driving the compressor, comprising the steps of:
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sensing fluid mass flow related to said compressor; detecting a compression ratio of said compressor; generating at least one of variable upper or lower current reference values in response to said at least one of mass flow and compression ratio, whereby said variable upper and lower current reference values are responsive to variable operating conditions of said compressor; and detecting motor current value above or below said variable upper or lower current reference value, whereby a failure in the compressor system is detected.
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Specification