Control device that detects surging
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsTakaharu Hiroe, Minoru Matsuo, Tatsuo Ishiguro, Akihiro Nakaniwa, Yasunori Tokimasa
Life of this patent
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Abstract
A control device includes: a variation command unit that changes a command value, which is a command value sent to a system including a compressor, affecting an operating state of the compressor; a proportional coefficient calculation unit that calculates a proportional coefficient of a variation in a parameter, which indicates a state of the compressor or an electric motor that drives the compressor when the system is operated based on the command value, with respect to the command value; and a control unit that performs control for avoiding or suppressing surging in the compressor, based on a value of the proportional coefficient.
Claims4
A control device comprising:
- a central processing unit (CPU) that:
- changes a command value that is sent to a system including a compressor and affects an operating state of the compressor,
- calculates a proportional coefficient of a variation in a parameter that indicates a state of the compressor or an electric motor that drives the compressor when the system is operated based on the command value, with respect to the command value, and
- performs control for avoiding or suppressing surging in the compressor, based on a value of the proportional coefficient, wherein
- the command value is a rotation speed command value of the compressor, and
- the CPU further:
- changes the rotation speed command value on a time basis during each cycle of the compressor,
- calculates the proportional coefficient when the rotation speed command value is changed, and
- performs control for increasing a flow rate of fluid sucked and discharged by the compressor, according to a magnitude of the proportional coefficient.
A control device comprising:
- a central processing unit (CPU) that:
- changes a command value that is sent to a system including a compressor and affects an operating state of the compressor,
- calculates a proportional coefficient of a variation in a parameter that indicates a state of the compressor or an electric motor that drives the compressor when the system is operated based on the command value, with respect to the command value, and
- detects surging in the compressor based on a value of the proportional coefficient, wherein
- the command value is a rotation speed command value of the compressor, and
- the CPU further:
- periodically changes the rotation speed command value on a time basis during each cycle of the compressor,
- calculates the proportional coefficient when the rotation speed command value is changed, and
- detects the surging in the compressor according to a magnitude of the proportional coefficient.
Dependencies are inferred from the claim text.