Rotation speed control device, air conditioner, and rotation speed control method
First Claim
1. A rotation speed control device for controlling a rotational speed of an outdoor fan that is arranged to send air to an outdoor heat exchanger of a refrigerant circuit in order to enhance heat exchange at the outdoor heat exchanger, the rotation speed control device comprising:
- a first control unit configured to execute a first control in order to control the rotational speed of the outdoor fan based on an operation frequency of a compressor of the refrigerant circuit;
a second control unit configured to execute a second control in order to control the rotational speed of the outdoor fan based on a parameter other than the operation frequency in order to obtain a differential pressure between the high and low pressure of a compressor; and
a switching unit configured to execute a switching control in which said switching control switchesto the first control from the second control if a first switching condition is met while the second control is being executed, andto the second control from the first control if a second switching condition is met while the first control is being executed,said first switching condition including a first outside-air-temperature condition where the outside air temperature is lower than a first temperature when operating in a cooling mode, andsaid second switching condition including a condition where the differential pressure between the high and low pressure of the compressor is below a predetermined standard value.
1 Assignment
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Accused Products
Abstract
An outdoor control unit includes a first control unit, a second control unit, and a switching unit. The outdoor control unit controls the rotational speed of an outdoor fan. The first control unit executes a first control for controlling the rotational speed of the outdoor fan based on the operation frequency of the compressor. The second control unit executes a second control for controlling the rotational speed of the outdoor fan based on a parameter other than the operation frequency of the compressor. The switching unit executes a switching control for switching between the first control and the second control according to a predetermined switching condition, when a cooling mode is being operated under a low outside air condition. The low outside air condition refers to a state that the outside air temperature is lower than a first temperature.
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Citations
19 Claims
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1. A rotation speed control device for controlling a rotational speed of an outdoor fan that is arranged to send air to an outdoor heat exchanger of a refrigerant circuit in order to enhance heat exchange at the outdoor heat exchanger, the rotation speed control device comprising:
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a first control unit configured to execute a first control in order to control the rotational speed of the outdoor fan based on an operation frequency of a compressor of the refrigerant circuit; a second control unit configured to execute a second control in order to control the rotational speed of the outdoor fan based on a parameter other than the operation frequency in order to obtain a differential pressure between the high and low pressure of a compressor; and a switching unit configured to execute a switching control in which said switching control switches to the first control from the second control if a first switching condition is met while the second control is being executed, and to the second control from the first control if a second switching condition is met while the first control is being executed, said first switching condition including a first outside-air-temperature condition where the outside air temperature is lower than a first temperature when operating in a cooling mode, and said second switching condition including a condition where the differential pressure between the high and low pressure of the compressor is below a predetermined standard value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A rotation speed control device for controlling a rotational speed of an outdoor fan that is arranged to send air to an outdoor heat exchanger of a refrigerant circuit in order to enhance heat exchange at the outdoor heat exchanger, the rotation speed control device comprising:
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a first control unit configured to execute a first control in order to control the rotational speed of the outdoor fan based on an operation frequency of a compressor of the refrigerant circuit; a second control unit configured to execute a second control in order to control the rotational speed of the outdoor fan based on a parameter other than the operation frequency, the parameter being pressure of a discharge side of the compressor or temperature of the outdoor heat exchanger; and a switching unit configured to execute a switching control in order to switch between the first control and the second control in accordance with a predetermined switching condition when a cooling mode is being operated and when outside air temperature is lower than a first temperature, the switching unit being further configured to switch from the first control to the second control if the outside air temperature is below a second temperature that is lower than the first temperature when the first control is being executed. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A rotation speed control device for controlling a rotational speed of an outdoor fan that is arranged to send air to an outdoor heat exchanger of a refrigerant circuit in order to enhance heat exchange at the outdoor heat exchanger, the rotation speed control device comprising:
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a first control unit configured to execute a first control in order to control the rotational speed of the outdoor fan based on an operation frequency of a compressor of the refrigerant circuit; a second control unit configured to execute a second control in order to control the rotational speed of the outdoor fan based on a parameter other than the operation frequency; a switching unit configured to execute a switching control in order to switch between the first control and the second control in accordance with a predetermined switching condition when a cooling mode is being operated and when outside air temperature is lower than a first temperature; and a selection receiving unit configured to receive a selection in order to selectively enable or disable the switching control, the second control being executed and the first control not being executed if a selection is received by the selection receiving unit to disable the switching control.
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18. An air conditioner, comprising:
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a refrigerant circuit having a compressor, an outdoor heat exchanger, expansion valves, and an indoor heat exchanger; an outdoor fan arranged to send air to the outdoor heat exchanger in order to enhance heat exchange at the outdoor heat exchanger; and a rotation speed control unit configured to control a rotational speed of the outdoor fan, the rotation speed control unit including a first control unit configured to execute a first control in order to control the rotational speed based on an operation frequency of the compressor, a second control unit configured to execute a second control in order to control the rotational speed based on a parameter other than the operation frequency in order to obtain a differential pressure between the high and low pressure of a compressor, and a switching unit configured to execute a switching control in which said switching control switches to the first control from the second control if a first switching condition is met while the second control is being executed, and to the second control from the first control if a second switching condition is met while the first control is being executed, said first switching condition including a first outside-air-temperature condition where the outside air temperature is lower than a first temperature when operating in a cooling mode, and said second switching condition including a condition where the differential pressure between the high and low pressure of the compressor is below a predetermined standard value.
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19. A rotation speed control method for controlling a rotational speed of an outdoor fan arranged to send air to an outdoor heat exchanger of a refrigerant circuit in order to enhance heat exchange at the outdoor heat exchanger, the rotation speed control method comprising:
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controlling the rotational speed based on an operation frequency of a compressor of the refrigerant circuit when a first control is executed; controlling the rotational speed based on a parameter other than the operation frequency when a second control is executed in order to obtain a differential pressure between the high and low pressure of a compressor; and switching to the first control from the second control if a first switching condition is met while the second control is being executed, and to the second control from the first control if a second switching condition is met while the first control is being executed, said first switching condition including a first outside-air-temperature condition where the outside air temperature is lower than a first temperature when operating in a cooling mode, and said second switching condition including a condition where the differential pressure between the high and low pressure of the compressor is below a predetermined standard value.
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Specification