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Method for controlling or regulating a coolant circuit of a motor vehicle air conditioning system

A technology for refrigerant circulation and vehicle air conditioning, which is applied in refrigerators, refrigeration components, vehicle components, etc., and can solve problems such as high cost and large structural space consumption.

Inactive Publication Date: 2017-08-18
BAYERISCHE MOTOREN WERKE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Especially when using R744 as the refrigerant, it is only possible to store enough refrigerant to compensate for the loss of charge due to leaks during suitable maintenance intervals only with high costs and a large consumption of installation space, because especially in The maximum permissible packing density of the system is a limiting factor for the so-called R744 refrigerant

Method used

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  • Method for controlling or regulating a coolant circuit of a motor vehicle air conditioning system
  • Method for controlling or regulating a coolant circuit of a motor vehicle air conditioning system

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Embodiment Construction

[0021] figure 1 The refrigerant circuit KK of the shown vehicle air conditioner comprises a compressor K for compressing the refrigerant KM, downstream of which compressor is connected on the high-pressure side a condenser or gas cooler GK. An externally adjustable or controllable refrigerant expansion device EXV is connected downstream of the condenser or gas cooler GK, followed by an evaporator V. A collector S can also be provided downstream of the evaporator V or downstream of the condenser / gas cooler GK. Usually, the so-called R744 refrigeration cycle mostly also includes an internal heat exchanger, and the illustration is omitted here. For the precise construction of such a refrigeration circuit, reference is made to the known prior art.

[0022] The air conditioner controller SG controls the operation of the air conditioner in a conventional manner according to the refrigerant flow rate or the refrigerant differential pressure achieved between the high-pressure and lo...

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PUM

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Abstract

The invention relates to a method and to a correspondingly designed device for controlling or regulating a coolant circuit of an air conditioning system (KK), which comprises at least one compressor (K), at least one condenser or gas cooler (GK), and at least one evaporator (V), a controllable coolant expansion device (EXV) being connected to the coolant inlet thereof. According to the invention, it is detected when the coolant circuit is under filled with a coolant and when an under filling of the coolant is detected, the control strategy of the expansion device is changed.

Description

technical field [0001] The invention relates to a method and a correspondingly designed device for controlling or regulating a refrigerant circuit of a vehicle air conditioning system. Background technique [0002] The vehicle air conditioner includes a refrigerant circulation circuit through which the refrigerant required for cooling the air flows. During operating hours, due to system-determined leaks or due to damage, refrigerant may be discharged from the refrigerant circuit. In refrigerant circuits filled with too little refrigerant, unusually high superheating occurs in the evaporator when cooling power is required. According to the control and regulation concept, in order to achieve the required cooling capacity, for example, the compressor is actuated more and more intensively, and thus the suction pressure upstream of the compressor can be continuously reduced according to the control principle of the compressor in the refrigeration circuit, so that Attempts to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B49/02
CPCF25B49/005F25B49/02F25B2500/24F25B2309/061F25B2700/04F25B2600/2513F25B2700/197F25B2700/21175F25B9/008B60H1/3225B60H2001/3285B60H2001/3261B60H1/00885B60H2001/3236
Inventor R·赫博尔茨海默O·霍恩S·莫根施特恩
Owner BAYERISCHE MOTOREN WERKE AG
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