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US 6,523,360 B2Granted
Cooling cycle and control method thereof
AssigneeCalsonic Kansei Corporation
InventorsToshiharu Watanabe, Torahide Takahashi, Yoshihiro Sasaki, Masahiro Iguchi, Kojiro Nakamura, Yasuhito Okawara
Life of this patent
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Abstract
A cooling cycle with a high-pressure side operating in a supercritical area of refrigerant includes a temperature sensor for sensing a temperature of cooled refrigerant between a gas cooler and an internal heat exchanger, a pressure sensor for sensing a pressure of cooled refrigerant between the two, and a controller for controlling at least one of a compressor and a throttling device in accordance with the sensed temperature and the sensed pressure.
Claims18
A cooling cycle with a high-pressure side operating in a supercritical area of a refrigerant, comprising:
- a compressor that compresses the refrigerant;
- a gas cooler that cools the compressed refrigerant;
- a throttling device that throttles flow of the cooled refrigerant;
- an evaporator that cools intake air by a heat absorbing action of the cooled refrigerant;
- an internal heat exchanger that carries out heat exchange between the cooled refrigerant and the refrigerant that passed through the evaporator;
- a temperature sensor that senses a temperature of the cooled refrigerant between the gas cooler and the internal heat exchanger;
- a pressure sensor that senses a pressure of the cooled refrigerant between the gas cooler and the internal heat exchanger;
- and
- a controller that controls at least one of the compressor and the throttling device in accordance with the sensed temperature of the cooled refrigerant and the sensed pressure of the cooled refrigerant,
- wherein a relationship between the sensed temperature and the sensed pressure satisfies one of at least two control expressions, the at least two control expressions comprising a first control expression giving high priority to a coefficient of performance (COP), and a second control expression giving high priority to a cooling capacity.
7 more elements
A cooling cycle with a high-pressure side operating in a supercritical area of a refrigerant, comprising:
- a compressor that compresses the refrigerant;
- a gas cooler that cools the compressed refrigerant;
- a throttling device that throttles flow of the cooled refrigerant;
- an evaporator that cools intake air by a heat absorbing action of the cooled refrigerant;
- an internal heat exchanger that carries out heat exchange between the cooled refrigerant and the refrigerant that passed through the evaporator;
- a temperature sensor that senses a temperature of the cooled refrigerant between the gas cooler and the internal heat exchanger;
- a pressure sensor that senses a pressure of the cooled refrigerant between the gas cooler and the internal heat exchanger;
- and
- a controller that controls at least one of the compressor and the throttling device in accordance with the sensed temperature of the cooled refrigerant and the sensed pressure of the cooled refrigerant,
- wherein the throttling device is interposed between the gas cooler and the internal heat exchanger.
7 more elements
A method of controlling a cooling cycle with a high-pressure side operating in a supercritical area of a refrigerant, the cooling cycle comprising:
- a compressor that compresses the refrigerant;
- a gas cooler that cools the compressed refrigerant;
- a throttling device that throttles flow of the cooled refrigerant;
- an evaporator that cools intake air by a heat absorbing action of the cooled refrigerant;
- and
- an internal heat exchanger that carries out heat exchange between the cooled refrigerant and the refrigerant that passed through the evaporator,
- the method comprising:
- sensing a temperature of the cooled refrigerant between the gas cooler and the internal heat exchanger and a pressure of the cooled refrigerant between the gas cooler and the internal heat exchanger;
- determining a control pattern of the cooling cycle in accordance with operating environments of the cooling cycle;
- and
- controlling at least one of the compressor and the throttling device in accordance with the determined control pattern, the controlling step allowing adjustment of the temperature of the cooled refrigerant and the pressure of the cooled refrigerant,
- wherein the control pattern comprises at least two control expressions,
- wherein the at least two control expressions comprise a first control expression giving high priority to a coefficient of performance (COP) and a second control expression giving high priority to a cooling capacity, and
- wherein a relationship between the sensed temperature and the sensed pressure satisfies one of the at least two control expressions.
11 more elements
A cooling cycle with a high-pressure side operating in a supercritical area of a refrigerant, comprising:
- a compressor that compresses the refrigerant;
- a gas cooler that cools the compressed refrigerant;
- means for throttling flow of the cooled refrigerant;
- an evaporator that cools intake air by heat absorbing action of the cooled refrigerant;
- an internal heat exchanger that carries out heat exchange between the cooled refrigerant and the refrigerant that passed through the evaporator;
- means for sensing a temperature of the cooled refrigerant between the gas cooler and the internal heat exchanger;
- means for sensing a pressure of the cooled refrigerant between the gas cooler and the internal heat exchanger;
- and
- means for controlling at least one of the compressor and the throttling means in accordance with the sensed temperature of the cooled refrigerant and the sensed pressured of the cooled refrigerant,
- wherein a relationship between the sensed temperature and the sensed pressure satisfies one of at least two control expressions, and
- wherein the at least two control expressions comprises a first control expression giving high priority to a coefficient of performance (COP), and a second control expression giving high priority to a cooling capacity.
8 more elements
A method of controlling a cooling cycle with a high-pressure side operating in a supercritical area of a refrigerant, the cooling cycle comprising:
- a compressor that compresses the refrigerant;
- a gas cooler that cools the compressed refrigerant;
- a throttling device that throttles flow of the cooled refrigerant;
- an evaporator that cools intake air by a heat absorbing action of the cooled refrigerant;
- and
- an internal heat exchanger that carries out heat exchange between the cooled refrigerant and the refrigerant that passed through the evaporator,
- the method comprising:
- sensing a temperature of the cooled refrigerant between the gas cooler and the internal heat exchanger and a pressure of the cooled refrigerant between the gas cooler and the internal heat exchanger;
- determining a control pattern of the cooling cycle in accordance with operating environments of the cooling cycle, the operating environments comprising an outside-air temperature and a cabin set temperature;
- and
- controlling at least one of the compressor and the throttling device in accordance with the determined control pattern, the controlling step allowing adjustment of the temperature of the cooled refrigerant and the pressure of the cooled
8 more elements
Dependencies are inferred from the claim text.