Refrigeration cycle control unit

A control device and refrigeration cycle technology, applied to pump control, refrigerators, refrigeration components, etc., can solve the problems of inability to realize control, increase system cost, and inability to obtain compressor exhaust pressure, etc., and achieve cost reduction and simplification of the system Effect

Inactive Publication Date: 2005-02-02
SANDEN CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in such a conventional control system, there is a problem in that since a detector such as a sensor is provided, it causes an increase in the cost of the entire system
In addition, if a sensor is installed near the condenser, the detected value will be different from the compressor discharge pressure, so ideal control cannot be achieved
In addition, from the point of view of protecting the compressor, if the discharge pressure of the compressor itself cannot be obtained, it is difficult to protect the compressor quickly and effectively, and troubles may arise due to an abnormal increase in pressure

Method used

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Embodiment Construction

[0029]FIG. 1 shows a vehicle air conditioning system provided with a refrigeration cycle control device according to an embodiment of the present invention. In FIG. 1 , a vehicle air conditioning system 1 has an air duct 2 opening toward the interior of the vehicle, and upstream of the air duct 2 is provided a fan 6 . The blower 6 blows air sucked in from the outside air introduction port 4 and the inside air introduction port regulated by the outside air / inside air switching damper 3 . An evaporator 7 as a cooler for cooling blown air is provided downstream of the fan 6, and a heater core as a heater 8 is provided at a position downstream of the evaporator. For example, engine cooling water circulates through the heater 8 . An air mix damper 10 whose opening degree is adjusted by the air mix damper drive mechanism 9 is provided immediately upstream of the heater 8 . The temperature controlled air is discharged through each of the exhaust ports 14, 15 and 16 having respectiv...

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Abstract

A refrigeration cycle control unit comprises a discharge pressure estimation means for estimating a discharge pressure of a compressor by referring to a physical value with a correlation with a suction pressure of the compressor estimated or detected by a suction pressure estimation or detection means and a physical value with a correlation with a pressure difference between the discharge pressure and the suction pressure estimated or detected by a pressure difference estimation or detection means. In a refrigeration cycle having an external signal control type variable displacement compressor, a discharge pressure of the compressor can be estimated without detecting a high-pressure side pressure by a sensor, and the discharge pressure can be controlled at an optimum pressure to protect the compressor, and further, it is possible to make a more inexpensive system.

Description

technical field [0001] The present invention relates to a control device for a refrigerating cycle with a variable capacity compressor controlled by an external control signal, specifically, the refrigerating cycle control device of the present invention can control the compressor by estimating the discharge pressure of the compressor Displacement to realize the control of the discharge pressure of the compressor. Background technique [0002] In the existing control of the compressor discharge pressure of a refrigeration cycle with a compressor, a condenser and a refrigerant evaporator, by using a sensor or the like to detect the refrigerant discharge pressure of the compressor, the condensation The refrigerant pressure in the device or the refrigerant pressure of a certain part before the expansion valve is used to prevent excessive refrigerant discharge pressure. [0003] However, in this conventional control system, there is a problem in that the cost of the entire syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/02B60H1/32F25B1/00F25B27/00F25B49/02
CPCB60H1/3211F25B2700/21173F25B49/022F25B2700/2106F25B2500/19F25B2700/21175B60H1/3205B60H2001/3275B60H2001/327F25B27/00B60H2001/3261B60H2001/3266F25B2600/02B60H2001/3242B60H2001/325
Inventor 铃木谦一今井智规井上敦雄椎名正树
Owner SANDEN CORP
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