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AssigneeVolvo Technology Corporation
InventorsAndreas Sjöberg, Andreas Roupé
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A system and a method for operating a variable-displacement compressor are provided wherein a volume of a compression chamber of at least one cylinder is varied during a compression cycle, wherein during the cycle the at least one cylinder is alternately coupled to a low pressure side and a high pressure side of the compressor. A first thermodynamic state of the low pressure side and a second thermodynamic state of the high pressure side can be estimated and a current compression ratio ( v in v out ) of the compressor can be estimated. Accordingly, a compressor displacement (D) as a function of the compression ratio ( v in v out ) can be calculated. From this, a compressor torque (M) depending on the calculated displacement (D) can be computed, and the compressor torque (M) can be provided to a control unit for operating the compressor or an engine coupled to the compressor.
A method for operating a variable-displacement compressor, wherein a volume of a compression chamber of at least one cylinder is varied during a compression cycle, wherein during the cycle the at least one cylinder is alternately coupled to a low pressure side and a high pressure side of the compressor, comprising
A system comprising a variable displacement compressor, an evaporator in operational connection with an inlet of the compressor, a condenser in operational connection with an outlet of the compressor, wherein the compressor is coupled to a control unit capable of operating the compressor according to a method as set forth in one of the preceding claims, providing a compressor torque (M) depending on a calculated compressor displacement (D).
A computer program product stored on a computer readable medium, comprising a program code for use in a method comprising at least the steps of
Dependencies are inferred from the claim text.