Air Conditioning Systems For Vehicles
a technology for air conditioning systems and vehicles, applied in the direction of domestic cooling apparatus, lighting and heating apparatus, cooling fluid circulation, etc., can solve the problems of system search for optimization points without achieving stable control, and it is difficult to achieve stable control using the elevated pressure-side refrigerant temperature alon
Inactive Publication Date: 2007-02-08
SANDEN CORP
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AI Technical Summary
Benefits of technology
The present invention is an air conditioning system for vehicles that solves problems of the related art. It achieves stable control of the system, simplifies the control, and improves the performance of the refrigeration cycle. The system includes a compressor, gas cooler, expansion means, and cooler. It also has an elevated pressure density detecting means to control the density of the refrigerant. The method involves detecting physical values, calculating the density of the refrigerant, determining a target density, and controlling the expansion means to achieve the desired temperature. The technical effects of the invention are improved performance and control of the air conditioning system for vehicles.
Problems solved by technology
In this known system and control method, it is difficult to achieve stable control using the elevated pressure-side refrigerant temperature alone, because the temperature is measured during a transient state of the refrigeration cycle and a target pressure of the elevated pressure-side line changes continuously with the temperature.
More specifically, because the temperature is measured during a transient state of the refrigeration cycle, the system may search for the optimization point without achieving stable control.
Method used
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Embodiment Construction
[0016] Embodiments of the present invention and their features and technical advantages may be understood by referring to FIGS. 1-4. These embodiments are presented by way of example only and are not intended to limit the present invention.
[0017]FIG. 1 depicts an air conditioning system for vehicles according to an embodiment of the present invention. FIG. 1 shows the mechanical arrangement of components and the control means of an air conditioning system using carbon dioxide gas as the natural-system refrigerant. The mechanical arrangement of components may include an air circuit and a refrigeration circuit. In the refrigeration circuit, a compressor 1, a gas cooler 4 (e.g., a radiator), an expansion means 8 (e.g. an electronic expansion valve), a cooler 9 (e.g., an evaporator), and a liquid / gas separator 13 (e.g., an accumulator) may be provided. Further, in this embodiment, an inside heat exchanger 7 may be provided in the refrigeration circuit for performing heat exchange betwe...
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An air conditioning system for a vehicle includes a compressor, a gas cooler, an expansion means, and a cooler. The system also includes an elevated pressure density detector for detecting or estimating one or more physical values having a correlation with a density of an elevated pressure refrigerant in a refrigeration cycle. An elevated pressure density controller controls the density of the elevated pressure refrigerant. This control is achieved at least in part by using at least one of the one or more physical values.
Description
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates generally to air conditioning systems for vehicles. More specifically, the present invention is directed towards vehicle air conditioning systems having a vapor compression refrigeration cycle which may use a natural-system refrigerant, such as carbon dioxide. [0003] 2. Description of Related Art [0004] Vehicle air conditioning systems using carbon dioxide gas as a refrigerant in a vapor compression refrigeration cycle operate at an elevated pressure. The pressure of the refrigerant in an elevated pressure-side line is adjusted by controlling with an external control signal an opening degree of a valve of an electric expansion mechanism (for example, Japanese Published Patent Application No. HO-7-294033A). An objective of such a system is the optimization of a coefficient of performance of the refrigeration cycle through control of the pressure in the elevated pressure-side line. The pr...
Claims
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IPC IPC(8): F25D17/06F25B41/00
CPCB60H1/3211F25B2700/21173B60H2001/3251B60H2001/3257B60H2001/326B60H2001/3285F25B9/008F25B40/00F25B2309/061F25B2341/063F25B2500/19F25B2600/17F25B2700/19F25B2700/1931F25B2700/2102F25B2700/2106F25B2700/21152B60H2001/325
Inventor SUZUKI, KENICHITSUBOI, MASATOMATSUMOTO, YUUICHI
Owner SANDEN CORP