Method for use of temperature measurement point in compressor for temperature regulation of refrigerant circuit (circuit), method for regulating temperature of refrigerant circuit (circuit), compressor and vehicle

Abstract

The invention relates to a method for using at least one temperature measurement point (8) in a compressor (2) for temperature regulation of a refrigerant circuit (circuit), the temperature measurement point (8) being applied between a power electronics unit (6) of the compressor (2) and a compressor stage (4) downstream of the power electronics unit (6) in the flow direction of the refrigerant, the power electronics are circulated and cooled by a refrigerant flowing into the compressor (2). The invention further relates to a method for controlling the temperature of a refrigerant circuit (circuit), to a compressor, and to a vehicle.

Description

Technical Field

[0001] The invention relates to a method for using a temperature measuring point in a compressor for temperature regulation of a refrigerant circulation (loop), a method for regulating the temperature of a refrigerant circulation (loop), a compressor and a vehicle. Summary of the invention

[0002] The object of the invention is to improve the temperature regulation of a refrigeration medium cycle (loop).

[0003] This object is achieved by a method for the use of a temperature measuring point in a compressor as claimed in claim 1. Furthermore, a method for regulating the temperature of a refrigerant circuit is claimed (claim 5). A compressor (see claim 6) and a vehicle (claim 12) are also claimed. Advantageous embodiments of the invention are the subject of the dependent claims.

[0004] A method for applying at least one temperature measuring point in a compressor for temperature regulation of a refrigerant circulation (loop) is proposed, wherein the temperature measuring point is used between a power electronics device of the compressor and a compressor stage downstream of the power electronics device in the flow direction of the refrigerant medium, and the power electronics device is circulated and cooled by the refrigerant medium flowing into the compressor. Accordingly, the temperature measuring point is arranged or disposed downstream of the power electronics device and upstream of the compressor stage.

[0005] In this case, a temperature measuring point is to be understood as a position of the compressor at which the temperature can be detected or detected by a measuring element of a temperature measuring probe or temperature sensor. In this case, the temperature measuring probe or temperature sensor can be arranged at least mostly outside or inside the compressor, more precisely, the compressor housing. In this case, the temperature measuring probe or temperature sensor can be arranged or mounted in and / or on the compressor housing.

[0006] The proposed location of the temperature measuring point enables accurate detection of the temperature of the refrigerant before it enters the compressor stage. This enables accurate regulation of the temperature of the refrigerant cycle (loop) to the so-called superheat temperature in the vapor region of the refrigerant. This in turn ensures the highest possible efficiency of the refrigerant cycle (loop).

[0007] In one embodiment, at least one pressure measuring point is also used between the power electronics and the compressor stage. Thus, the pressure of the refrigerant can be detected accurately before it enters the compressor stage. Advantageously, the pressure drop that is formed as the power electronics are circulated is detected. Thus, using the detected temperature information and pressure information, the actual operating point of the refrigerant can be accurately determined in a so-called pressure-enthalpy state diagram or pH diagram of the refrigerant. This leads to an improvement in the temperature control or the efficiency.

[0008] In this context, a pressure measuring point is to be understood as a position of the compressor at which the pressure is tapped or detected by a measuring element of a pressure measuring probe or pressure sensor. In this context, the pressure measuring probe or pressure sensor can be arranged at least mostly outside or inside the compressor, more precisely, the compressor housing. In this context, the pressure measuring probe or pressure sensor can be arranged or mounted in and / or on the compressor housing.

[0009] In a further embodiment, at least one temperature sensor together with a temperature measuring point and / or at least one pressure sensor together with a pressure measuring point is used in and / or at the compressor.

[0010] In this case, the temperature sensor and / or the pressure sensor can be electrically connected to the power electronics.

[0011] In addition, a method for regulating the temperature of a refrigerant circulation (loop) is proposed, in which the temperature to be regulated in a compressor of the refrigerant circulation (loop) is detected at a measuring point between a power electronics of the compressor and a compressor stage downstream of the power electronics in the flow direction of the refrigerant, the power electronics being circulated and cooled by the refrigerant flowing into the compressor. Accordingly, the temperature measuring point is arranged or disposed downstream of the power electronics and upstream of the compressor stage.

[0012] The proposed location of the temperature measuring point enables accurate detection of the temperature of the refrigerant before it enters the compressor stage. This enables accurate regulation of the temperature of the refrigerant cycle (loop) to the so-called superheat temperature in the vapor region of the refrigerant. This in turn ensures the highest possible efficiency of the refrigerant cycle (loop).

[0013] Furthermore, a compressor for a refrigerant circulation (loop) is proposed, in which at least one temperature measuring point is arranged between a power electronics device of the compressor and a compressor stage downstream of the power electronics device in the flow direction of the refrigerant. Accordingly, the temperature measuring point is arranged or provided downstream of the power electronics device and upstream of the compressor stage.

[0014] In this case, at least one pressure measuring point can also be provided between the power electronics and the compressor stage.

[0015] In one embodiment, at least one temperature sensor is arranged in and / or next to the compressor together with the temperature measuring point and / or at least one pressure sensor is arranged in and / or next to the compressor together with the pressure measuring point. Here, the temperature sensor and / or the pressure sensor can be electrically connected to the power electronics.

[0016] In another embodiment, the temperature sensor and / or the pressure sensor is installed in the power electronics. Here, the temperature sensor and / or the pressure sensor can be implemented in a structural form at least partially printed on the power electronics.

[0017] Furthermore, a vehicle is proposed which has a refrigerant circuit for air conditioning a passenger compartment, wherein the refrigerant circuit has a compressor of the type described above.

[0018] Here, a vehicle is to be understood as any type of vehicle driven by an internal combustion engine and / or by an electric motor, but in particular as a passenger car and / or a commercial vehicle. Here, the vehicle is preferably a partially automatically operated vehicle and in particular a fully automatically operated vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The invention is further explained in detail with reference to the drawings. Other advantageous improvements of the invention are obtained from the dependent claims and the following description of preferred embodiments. For this purpose, the following is partially shown in a schematic manner:

[0020] Figure 1 shows the proposed compressor, and

[0021] Figure 2 A pressure-enthalpy diagram or ph diagram is shown illustrating the circulation (loop) of a refrigerant medium. DETAILED DESCRIPTION

[0022] The proposed compressor 2, also referred to as a compression device, is part of a refrigerant circuit of a vehicle. The refrigerant circuit serves for air conditioning of the passenger compartment and comprises a compressor 2 having a housing, which comprises power electronics 6 of the compressor 2 and - in the flow direction of the refrigerant - a compressor stage 4, also referred to as a compression device stage, downstream of the power electronics 6, which compresses and delivers the refrigerant in the refrigerant circuit.

[0023] Here, a temperature measuring point 8 is provided between the power electronics 6 and the compressor stage 4, so that the so-called superheat temperature of the refrigerant can be accurately detected before the refrigerant enters the compressor stage 4, and the refrigerant circulation (loop) is accurately adjusted to the superheat temperature. Accordingly, the temperature measuring point 8 is arranged or provided downstream of the power electronics 6 and upstream of the compressor stage 4.

[0024] In addition to the temperature measuring point 8, a pressure measuring point 10 is also provided between the power electronics 6 and the compressor stage 4, which, in combination with the temperature measuring point 8, enables accurate detection of the refrigerant working point in the ph diagram, and thus accurately adjusts the refrigerant circulation (loop) to the superheat temperature. The temperature measuring point 8 and the pressure measuring point 10 are arranged or provided downstream of the power electronics 6 and upstream of the compressor stage 4, respectively.

[0025] In this case, a refrigerant supply 12 opens into the compressor housing, whereas a refrigerant discharge 14 leads out of the compressor housing, more precisely out of the compressor stage 4 .

[0026] By the flow of the refrigerant into the compressor housing, the refrigerant flows around the power electronics 6 and cools the power electronics at the same time. The waste heat or heat loss of the power electronics 6 then additionally warms or heats the refrigerant to the heating temperature.

[0027] Figure 2 The pressure-enthalpy state diagram or ph diagram of the refrigerant medium R-1234yf is illustrated as an example. In this state diagram, the specific enthalpy h is shown on the horizontal axis and the pressure p is shown on the vertical axis.

[0028] In this ph diagram, the refrigerant circulation (loop) is also illustrated (see the drawn lines A, B, C, D for this purpose). Line A represents the evaporation of the refrigerant, line B represents the compression of the refrigerant, line C represents the condensation of the refrigerant and line D represents the expansion of the refrigerant.

[0029] Here, for the refrigerant circulation (loop), the desired refrigerant superheat temperature should be adjusted. Here, the superheat temperature is shown by the point or corner formed by line A and line B, more precisely the hot point UE. Along line A, the refrigerant is evaporated to the so-called condensation curve and is also slightly superheated, that is to say to the point UE on the right side of the condensation curve, after which the refrigerant finally flows into the compressor stage 4 in a completely vaporized or gaseous form and is compressed to a higher temperature and pressure level.

[0030] Unlike the temperature measurement point before the compressor 2, the position of the proposed temperature measurement point 8 enables accurate detection of the expected superheat temperature of the refrigerant medium located to the right of the condensation curve in the so-called vapor region of the refrigerant medium, and thus enables the temperature of the refrigerant medium circulation (loop) to be accurately adjusted to the superheat temperature.

[0031] In conjunction with the proposed pressure measuring point 10 , it is now advantageously possible to detect and adjust the exact operating point of the refrigerant in the ph diagram in the vapor region of the refrigerant to the right of the condensation curve.

[0032] Unlike the temperature measurement point upstream of the compressor 2 (which only allows a relatively strong or large overheating of the refrigerant), the expected, slight (that is, the minimum or necessary) overheating of the refrigerant that exceeds the so-called condensation curve by about 2K to 10K can be adjusted by correspondingly controlling the compressor stage. At this time, the undesired distortion or distortion of the refrigerant working point in the ph diagram caused by the heat input into the refrigerant when the power electronics 6 is circulated by the refrigerant is prevented. This ensures the accuracy of adjusting the temperature of the refrigerant circulation (loop) to the superheat temperature. And because the expected superheating of the refrigerant can be set as small as possible, that is, it will not be set stronger or larger than necessary, the efficiency of the refrigerant circulation (loop) is improved.

[0033] The efficiency of the refrigerant circulation (loop) is optimal when the refrigerant is almost in a vapor state before entering the compressor 2. Figure 2 In this case, this corresponds to a point along line A not far in front of the condensation curve, so that the refrigerant is additionally heated or heated to a point to the right of the condensation curve, more precisely the overheating point UE, due to the circulation of the power electronics 6. The overheating point UE corresponds to a degree of overheating of the refrigerant of about 2 K to 10 K to the right of the condensation curve, more precisely depending on the efficiency of the refrigerant circulation (loop) present and the heat loss generated by the power electronics 6.

[0034] In an alternative embodiment, not shown in the figures, the pressure measuring point is not arranged between the power electronics 6 and the compressor stage 4, but upstream of the compressor 2. In this case, the pressure loss due to the flow of the refrigerant around the power electronics 6 should be taken into account or taken into account, for example, this pressure loss can be estimated.

[0035] In another alternative embodiment, not shown in the figures, pressure measuring points are provided both upstream of the compressor 2 and between the power electronics 6 and the compressor stage 4. In this case, the pressure loss due to the refrigerant flowing around the power electronics 6 can be detected precisely.

[0036] according to Figure 1 A temperature sensor including a temperature measuring point 8 and / or a pressure sensor including a pressure measuring point 10 can be arranged in and / or next to the compressor 2. The temperature sensor and the pressure sensor can form a sensor unit or a so-called pT sensor (more precisely, a pressure-temperature sensor).

[0037] Furthermore, alternatively, a temperature sensor connected to the temperature measuring point 8 and / or a pressure sensor connected to the pressure measuring point 10, or a sensor unit comprising a temperature sensor connected to the temperature measuring point 8 and a pressure sensor connected to the pressure measuring point 10, or a so-called pT sensor, can be arranged outside the compressor 2 or at least mostly outside the compressor.

[0038] In another embodiment, which is not shown in the figures, the temperature sensor and / or the pressure sensor is electrically connected to the power electronics 6 .

[0039] In another embodiment not shown in the figures, the temperature sensor and / or the pressure sensor is installed in the power electronics 6. Here, the temperature sensor and / or the pressure sensor can be implemented in the form of a structure at least partially printed / embossed on the power electronics. The printed embodiment enables a cost-effective implementation of the temperature sensor and / or the pressure sensor on the power electronics 6 of the compressor 2.

[0040] Although exemplary embodiments are described in the above description, it should be noted that a variety of variations are possible. It should also be noted that the exemplary embodiments are provided for illustrative purposes only and should not limit the scope of protection, application and structure in any way. On the contrary, the above description provides guidance for those skilled in the art to implement at least one exemplary embodiment, wherein various modifications may be made, especially in terms of the functions and arrangements of the described components, without departing from the scope of protection resulting from the claims and equivalent feature combinations.

Claims

1. A method for using at least one temperature measuring point (8) in a compressor (2) for temperature regulation of a refrigeration medium cycle (loop), wherein: The temperature measuring point (8) is used between a power electronics device (6) of a compressor (2) and a compressor stage (4) located downstream of the power electronics device (6) in the flow direction of the refrigerant, the power electronics device being circulated and cooled by the refrigerant medium flowing into the compressor (2).

2. The application method according to claim 1, characterized in that: At least one pressure measuring point (10) is also used between the power electronics (6) and the compressor stage (4).

3. The application method according to claim 1 or 2, characterized in that: At least one temperature sensor including a temperature measuring point (8) and / or at least one pressure sensor including a pressure measuring point (10) are used in and / or next to the compressor (2).

4. The application method according to claim 3, characterized in that: The temperature sensor and / or the pressure sensor are electrically connected to the power electronics (6).

5. A method for regulating the temperature of a refrigerant circulation (loop), in which the temperature to be regulated in a compressor (2) of a refrigerant circulation (loop) is detected at a measuring point between a power electronics device (6) of the compressor (2) and a compressor stage (4) located downstream of the power electronics device (6) in the flow direction of the refrigerant, the power electronics device (6) being circulated and cooled by the refrigerant flowing into the compressor (2).

6. A compressor (2) for a refrigerant medium circulation (loop), in which at least one temperature measuring point (8) is arranged between a power electronics device (6) of the compressor (2) and a compressor stage (4) located downstream of the power electronics device (6) in the flow direction of the refrigerant medium.

7. The compressor (2) according to claim 6, characterized in that At least one pressure measuring point (10) is also provided between the power electronics (6) and the compressor stage (4).

8. The compressor (2) according to claim 6 or 7, characterized in that At least one temperature sensor including a temperature measuring point (8) and / or at least one pressure sensor including a pressure measuring point (10) are arranged in the compressor (2) and / or next to the compressor.

9. The compressor (2) according to claim 8, characterized in that The temperature sensor and / or the pressure sensor are electrically connected to the power electronics (6).

10. The compressor (2) according to claim 9, characterized in that The temperature sensor and / or the pressure sensor are installed in the power electronics (6).

11. The compressor (2) according to claim 10, characterized in that The temperature sensor and / or the pressure sensor is embodied in the form of a structure which is at least partially printed on the power electronics device.

12. A vehicle having a refrigerant medium cycle (circuit) for air conditioning of a passenger compartment, wherein: The refrigerant circulation circuit has a compressor ( 2 ) according to any one of the preceding claims 6 to 11 .

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