Control method and device of air conditioning system, air conditioning system and storage medium

Abstract

The embodiment of the invention provides a control method and device of an air conditioning system, the air conditioning system and a computer readable storage medium, and relates to the technical field of air conditioners. The method comprises the steps that if the current working mode of the air conditioning system is a non-heat-pump working mode, environment temperature information and refrigerant pressure information corresponding to the air conditioning system are obtained; based on at least one of the environment temperature information and the refrigerant pressure information, a target working mode of the air conditioning system is determined; and operating the air conditioning system through the target working mode. According to the embodiment of the invention, the precise switching of the working modes of the heat pump in combination with the multi-dimensional information of the environment temperature and the refrigerant pressure is realized, the operation of the compressor under a low-temperature or low-pressure condition is avoided, the service life of the compressor is prolonged, and the performance stability of the air conditioning system is protected.

Description

Technical Field

[0001] The present application relates to the field of air-conditioning technology, and in particular to a control method and device for an air-conditioning system, an air-conditioning system, and a storage medium. Background Art

[0002] Heat pump air conditioner is a system that uses heat energy transfer technology to perform cooling and heating. Compared with traditional air conditioners, heat pump air conditioners are not a single refrigerator, but are based on heat pumps and use compressors, heat exchangers, expansion valves and other technologies to complete the functions of cooling and heating. Since heat pump air conditioners use energy in the environment to work, they are energy-saving and environmentally friendly. Summary of the invention

[0003] The present application provides a control method and device for an air-conditioning system, an air-conditioning system and a storage medium, which are used to solve the problem of inaccurate switching of working modes of air-conditioning compressors in the prior art.

[0004] According to one aspect of the present application, a method for controlling an air conditioner is provided, the method comprising:

[0005] If the current working mode of the air-conditioning system is a non-heat pump working mode, obtain the ambient temperature information and refrigerant pressure information corresponding to the air-conditioning system;

[0006] determining a target operating mode of the air conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information;

[0007] Operate the air conditioning system in target operation mode.

[0008] In a possible implementation, when the non-heat pump operation mode is the low-pressure heat pump protection mode, determining the target operation mode of the air-conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information includes:

[0009] After the compressor stops operating for a first period of time, a target operating mode is determined based on the refrigerant pressure information.

[0010] In a possible implementation, the method further includes:

[0011] If the current operating mode of the air-conditioning system is the heat pump operating mode, and the temperature drop rate of the detected ambient temperature information reaches a preset threshold, the target operating mode is determined based on the refrigerant pressure information after the compressor stops running for a second time period.

[0012] In another possible implementation, the above-mentioned determining the target working mode based on the refrigerant pressure information includes:

[0013] If the refrigerant pressure information is not less than the preset pressure threshold, the target operating mode is the heat pump operating mode.

[0014] In another possible implementation, the above-mentioned determining the target working mode based on the refrigerant pressure information further includes:

[0015] If the refrigerant pressure information is less than the preset pressure threshold, the target operating mode is the low-pressure heat pump protection mode.

[0016] In another possible implementation, when the non-heat pump operating mode is the low-temperature heat pump protection mode, determining the target operating mode of the air-conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information includes:

[0017] If the ambient temperature information is not less than the preset temperature threshold, and the refrigerant pressure information is greater than or equal to the preset pressure threshold, the target operating mode is the heat pump operating mode.

[0018] In another possible implementation, the determining of the target operating mode of the air-conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information further includes:

[0019] If the ambient temperature information is less than the preset temperature threshold, the target operating mode is the low-temperature heat pump protection mode.

[0020] According to another aspect of an embodiment of the present application, a control device for an air conditioner is provided, the device comprising:

[0021] An acquisition module, used to acquire the ambient temperature information and refrigerant pressure information corresponding to the air-conditioning system if the current working mode of the air-conditioning system is a non-heat pump working mode;

[0022] a determination module, configured to determine a target operating mode of the air conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information;

[0023] The operation module is used to operate the air conditioning system through a target working mode.

[0024] In another possible implementation, when the non-heat pump operating mode is the low-pressure heat pump protection mode, the above-mentioned determination module, when determining the target operating mode of the air-conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information, is used to:

[0025] After the compressor stops operating for a first period of time, a target operating mode is determined based on the refrigerant pressure information.

[0026] In another possible implementation, the above-mentioned determination module is further used to:

[0027] If the current operating mode of the air-conditioning system is the heat pump operating mode, and the temperature drop rate of the detected ambient temperature information reaches a preset threshold, the target operating mode is determined based on the refrigerant pressure information after the compressor stops running for a second time period.

[0028] In another possible implementation, when determining the target working mode based on the refrigerant pressure information, the determination module is used to:

[0029] If the refrigerant pressure information is not less than the preset pressure threshold, the target operating mode is the heat pump operating mode.

[0030] In another possible implementation, when determining the target working mode based on the refrigerant pressure information, the determination module is further configured to:

[0031] If the refrigerant pressure information is less than the preset pressure threshold, the target operating mode is the low-pressure heat pump protection mode.

[0032] In another possible implementation, when the non-heat pump operating mode is the low-temperature heat pump protection mode, the above-mentioned determination module determines the target operating mode of the air-conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information, and is used to:

[0033] If the ambient temperature information is not less than the preset temperature threshold, and the refrigerant pressure information is greater than or equal to the preset pressure threshold, the target operating mode is the heat pump operating mode.

[0034] In another possible implementation, when the determination module determines the target operating mode of the air-conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information, it is further configured to:

[0035] If the ambient temperature information is less than the preset temperature threshold, the target operating mode is the low-temperature heat pump protection mode.

[0036] According to another aspect of the present application, an air conditioning system is provided. The electronic device includes: a memory, a processor, and a computer program stored in the memory. The processor executes the computer program to implement the steps of the method shown in the first aspect of the present application.

[0037] According to another aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method shown in the first aspect of the present application are implemented.

[0038] The beneficial effects of the technical solution provided by this application are:

[0039] The air-conditioning control method, device, air-conditioning system and storage medium provided in the present application can switch the mode of the air-conditioning system in a non-heat pump working mode by obtaining the ambient temperature information and refrigerant pressure information corresponding to the air-conditioning system. Specifically, based on at least one of the ambient temperature information and the refrigerant pressure information, the target working mode of the air-conditioning system is determined, and the air-conditioning system is operated in the target working mode. The accurate switching of the heat pump working mode combining the multi-dimensional information of the ambient temperature and the refrigerant pressure is realized, the operation of the compressor under low temperature or low pressure conditions is avoided, the service life of the compressor is extended, and the performance stability of the air-conditioning system is protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] Figure 1 A flow chart of a control method for an air conditioning system provided in an embodiment of the present application;

[0042] Figure 2 A flowchart of a control method for an air conditioning system provided as an example in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the structure of a control device for an air-conditioning system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0045] Various structural schematic diagrams according to embodiments of the present disclosure are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may further design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0046] In the context of the present disclosure, when a layer / element is referred to as being "on" another layer / element, the layer / element may be directly on the other layer / element or an intervening layer / element may exist therebetween. In addition, if a layer / element is "on" another layer / element in one orientation, the layer / element may be "below" the other layer / element when the orientation is reversed.

[0047] The air conditioning system of new energy vehicles uses heat pump technology, which achieves higher energy efficiency through the reciprocating cycle of cooling and heating. Considering the shortage of power and energy for new energy vehicles, the heat pump air conditioning system is very suitable for its energy and environmental requirements.

[0048] The inventors have discovered that during the use of new energy vehicles, if the temperature is relied upon alone to determine the conditions for starting the compressor under heat pump conditions under special working conditions, there are certain deficiencies: for example, in a warm storage in a cold area, when the environment is below -10°C, the temperature sensor senses the temperature slowly, and under certain temperature judgment logic, misjudgment may occur; under special working conditions, the temperature sensor may fail to provide timely feedback. The above situation may cause the compressor to operate at extremely low temperatures, leading to damage.

[0049] Based on the above technical problems, some embodiments of the present application switch the mode of the air-conditioning system in the non-heat pump working mode by obtaining the ambient temperature information and refrigerant pressure information corresponding to the air-conditioning system. Specifically, based on at least one of the ambient temperature information and the refrigerant pressure information, the target working mode of the air-conditioning system is determined, and the air-conditioning system is operated in the target working mode. The accurate switching of the heat pump working mode combining the multi-dimensional information of the ambient temperature and the refrigerant pressure is realized, the operation of the compressor under low temperature or low pressure conditions is avoided, the service life of the compressor is extended, and the performance stability of the air-conditioning system is protected.

[0050] The following is a detailed description of the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0051] The present application provides a method for controlling an air conditioning system. Figure 1 As shown, it can be applied to an air conditioning system, and the method includes:

[0052] S101, if the current working mode of the air-conditioning system is a non-heat pump working mode, obtain the ambient temperature information and refrigerant pressure information corresponding to the air-conditioning system.

[0053] Wherein, the non-heat pump working mode includes a low-temperature heat pump protection mode and a low-pressure heat pump protection mode.

[0054] S102: Determine a target operating mode of the air-conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information.

[0055] Among them, the above-mentioned target operating mode includes a heat pump operating mode.

[0056] Specifically, whether the air-conditioning system can enter the heat pump working mode can be comprehensively judged based on the ambient temperature information and the refrigerant pressure information. The specific judgment steps will be described in detail below.

[0057] S103: operating the air conditioning system in a target operating mode.

[0058] The embodiment of the present application switches the mode of the air-conditioning system in a non-heat pump working mode by acquiring the ambient temperature information and refrigerant pressure information corresponding to the air-conditioning system. Specifically, based on at least one of the ambient temperature information and the refrigerant pressure information, the target working mode of the air-conditioning system is determined, and the air-conditioning system is operated in the target working mode. The accurate switching of the heat pump working mode combining the multi-dimensional information of the ambient temperature and the refrigerant pressure is realized, the operation of the compressor under low temperature or low pressure conditions is avoided, the service life of the compressor is extended, and the performance stability of the air-conditioning system is protected.

[0059] In an embodiment of the present application, a possible implementation method is provided. When the non-heat pump operating mode is the low-pressure heat pump protection mode, the target operating mode of the air-conditioning system is determined based on at least one of the ambient temperature information and the refrigerant pressure information, including:

[0060] After the compressor stops operating for a first period of time, a target operating mode is determined based on the refrigerant pressure information.

[0061] Specifically, when the air-conditioning system enters the low-pressure heat pump protection mode, it indicates that the current refrigerant pressure is too low. In order to prevent damage to the compressor when it starts at low pressure, the compressor will stop running for the first period of time to protect the performance and life of the compressor.

[0062] A possible implementation method is provided in an embodiment of the present application, and the method further includes:

[0063] If the current operating mode of the air-conditioning system is the heat pump operating mode, and the temperature drop rate of the detected ambient temperature information reaches a preset threshold, the target operating mode is determined based on the refrigerant pressure information after the compressor stops running for a second time period.

[0064] Specifically, when the air-conditioning system detects that the ambient temperature is too low in the heat pump operating mode, for example, when a new energy vehicle equipped with an air-conditioning system is driving in a warm storage in a cold area and the temperature drops below -10°C, the temperature drop rate of the ambient temperature will reach a preset threshold. At this time, the compressor can be operated for the second time period first, and then the target operating mode of the air-conditioning system is determined based on the refrigerant pressure.

[0065] In an embodiment of the present application, a possible implementation method is provided, wherein the target working mode is determined based on the refrigerant pressure information, including:

[0066] If the refrigerant pressure information is not less than the preset pressure threshold, the target operating mode is the heat pump operating mode.

[0067] A possible implementation method is provided in an embodiment of the present application, wherein the target working mode is determined based on the refrigerant pressure information, and further includes:

[0068] If the refrigerant pressure information is less than the preset pressure threshold, the target operating mode is the low-pressure heat pump protection mode.

[0069] Among them, the above pressure threshold may be 2.2 bar.

[0070] In an embodiment of the present application, when the refrigerant pressure is lower than a preset pressure threshold, the air-conditioning system can enter a low-pressure heat pump protection mode from a compressor stop mode to avoid low-pressure start-up of the compressor; when the refrigerant pressure is higher than the preset pressure threshold, the air-conditioning system can directly enter a heat pump working mode to achieve normal operation of the air-conditioning system.

[0071] In an embodiment of the present application, a possible implementation method is provided. When the non-heat pump working mode is the low-temperature heat pump protection mode, the target working mode of the air-conditioning system is determined based on at least one of the ambient temperature information and the refrigerant pressure information, including:

[0072] If the ambient temperature information is not less than the preset temperature threshold, and the refrigerant pressure information is greater than or equal to the preset pressure threshold, the target operating mode is the heat pump operating mode.

[0073] A possible implementation method is provided in an embodiment of the present application. The method of determining a target operating mode of the air-conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information further includes:

[0074] If the ambient temperature information is less than the preset temperature threshold, the target operating mode is the low-temperature heat pump protection mode.

[0075] The temperature threshold may be -10°C.

[0076] In the embodiment of the present application, when the air conditioning system is in the low-temperature heat pump protection mode, it can be determined whether the air conditioning system can enter the heat pump working mode based on the refrigerant pressure and the ambient temperature. When the ambient temperature is not less than -10°C and the refrigerant pressure of the air conditioning system is not less than 2.2 bar, the heat pump working mode can be entered; when the ambient temperature is less than -10°C, the low-temperature heat pump protection mode is maintained regardless of whether the refrigerant pressure is appropriate.

[0077] In order to better understand the method of the above air conditioning system, the following Figure 2 An example of a control method for an air conditioning system of the present application is described in detail, the method comprising the following steps:

[0078] When the air conditioning system is in heat pump working mode:

[0079] (1) If the air conditioning system stops the compressor due to low pressure protection, the refrigerant pressure value can be obtained again after the operation is suspended for a first period of time. When the refrigerant pressure value is less than 2.2 bar, the heat pump working mode will not be entered;

[0080] (2) If the air conditioning system stops the compressor due to low pressure protection, the system can suspend the operation for the first period of time and then obtain the refrigerant pressure value again. When the refrigerant pressure value is not less than 2.2 bar, the system will re-enter the heat pump working mode;

[0081] When the air conditioning system is in low temperature protection mode:

[0082] (1) If the ambient temperature of the air-conditioning system is not less than -10°C and the refrigerant pressure of the air-conditioning system is not less than 2.2 bar, the heat pump working mode can be entered;

[0083] (2) If the ambient temperature of the air conditioning system is less than -10°C, the heat pump operation mode cannot be entered and the current low temperature protection mode is maintained.

[0084] The present application embodiment provides a control device for an air conditioning system, such as Figure 3 As shown, the control device 30 of the air conditioning system may include: an acquisition module 301, a determination module 302 and an operation module 303;

[0085] The acquisition module 301 is used to acquire the ambient temperature information and refrigerant pressure information corresponding to the air-conditioning system if the current working mode of the air-conditioning system is a non-heat pump working mode;

[0086] A determination module 302, configured to determine a target operating mode of the air conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information;

[0087] The operation module 303 is used to operate the air conditioning system through a target working mode.

[0088] In an embodiment of the present application, a possible implementation is provided. When the non-heat pump operating mode is the low-pressure heat pump protection mode, the above-mentioned determination module 302 determines the target operating mode of the air-conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information, and is used to:

[0089] After the compressor stops operating for a first period of time, a target operating mode is determined based on the refrigerant pressure information.

[0090] A possible implementation method is provided in an embodiment of the present application, wherein the determination module 302 is further configured to:

[0091] If the current operating mode of the air-conditioning system is the heat pump operating mode, and the temperature drop rate of the detected ambient temperature information reaches a preset threshold, the target operating mode is determined based on the refrigerant pressure information after the compressor stops running for a second time period.

[0092] In an embodiment of the present application, a possible implementation is provided. When the determination module 302 determines the target working mode based on the refrigerant pressure information, it is used to:

[0093] If the refrigerant pressure information is not less than the preset pressure threshold, the target operating mode is the heat pump operating mode.

[0094] In an embodiment of the present application, a possible implementation is provided. When the determination module 302 determines the target working mode based on the refrigerant pressure information, it is further configured to:

[0095] If the refrigerant pressure information is less than the preset pressure threshold, the target operating mode is the low-pressure heat pump protection mode.

[0096] A possible implementation method is provided in the embodiment of the present application. When the non-heat pump operating mode is the low-temperature heat pump protection mode, the above-mentioned determination module 302 determines the target operating mode of the air-conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information, and is used to:

[0097] If the ambient temperature information is not less than the preset temperature threshold, and the refrigerant pressure information is greater than or equal to the preset pressure threshold, the target operating mode is the heat pump operating mode.

[0098] In an embodiment of the present application, a possible implementation is provided. When the determination module 302 determines the target operating mode of the air-conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information, it is further configured to:

[0099] If the ambient temperature information is less than the preset temperature threshold, the target operating mode is the low-temperature heat pump protection mode.

[0100] The device of the embodiments of the present application can execute the method provided by the embodiments of the present application, and the implementation principles are similar. The actions performed by each module in the device of each embodiment of the present application correspond to the steps in the method of each embodiment of the present application. For the detailed functional description of each module of the device, please refer to the description in the corresponding method shown in the previous text, which will not be repeated here.

[0101] The embodiment of the present application switches the mode of the air-conditioning system in a non-heat pump working mode by acquiring the ambient temperature information and refrigerant pressure information corresponding to the air-conditioning system. Specifically, based on at least one of the ambient temperature information and the refrigerant pressure information, the target working mode of the air-conditioning system is determined, and the air-conditioning system is operated in the target working mode. The accurate switching of the heat pump working mode combining the multi-dimensional information of the ambient temperature and the refrigerant pressure is realized, the operation of the compressor under low temperature or low pressure conditions is avoided, the service life of the compressor is extended, and the performance stability of the air-conditioning system is protected.

[0102] In an embodiment of the present application, an air conditioning system is provided, including a memory, a processor, and a computer program stored in the memory. The processor executes the above computer program to implement the steps of the control method of the air conditioning system. Compared with the related art, the following can be achieved: the embodiment of the present application switches the mode of the air conditioning system in a non-heat pump working mode by obtaining the ambient temperature information and refrigerant pressure information corresponding to the air conditioning system. Specifically, based on at least one of the ambient temperature information and the refrigerant pressure information, the target working mode of the air conditioning system is determined, and the air conditioning system is operated in the target working mode. The accurate switching of the heat pump working mode combined with the multi-dimensional information of the ambient temperature and the refrigerant pressure is achieved, the operation of the compressor under low temperature or low pressure conditions is avoided, the service life of the compressor is extended, and the performance stability of the air conditioning system is protected.

[0103] In an embodiment of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method shown in the first aspect of the embodiment of the present application are implemented.

[0104] In the above description, the technical details such as the patterning of each layer are not described in detail. However, those skilled in the art should understand that various technical means can be used to form layers, regions, etc. of desired shapes. In addition, in order to form the same structure, those skilled in the art can also design methods that are not completely the same as the methods described above. In addition, although the various embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage.

[0105] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0106] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A control method for an air conditioning system, characterized in that: include: If the current working mode of the air-conditioning system is a non-heat pump working mode, obtaining the ambient temperature information and refrigerant pressure information corresponding to the air-conditioning system; determining a target operating mode of the air conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information; The air conditioning system is operated in a target operating mode.

2. The method according to claim 1, characterized in that: When the non-heat pump operation mode is a low-pressure heat pump protection mode, determining the target operation mode of the air-conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information includes: After the compressor stops running for a first period of time, the target operating mode is determined based on the refrigerant pressure information.

3. The method according to claim 1, characterized in that: The method further comprises: If the current operating mode of the air-conditioning system is the heat pump operating mode, and it is detected that the temperature drop rate of the ambient temperature information reaches a preset threshold, then after the compressor stops running for a second time period, the target operating mode is determined based on the refrigerant pressure information.

4. The method according to any one of claims 2 to 3, characterized in that: The determining the target working mode based on the refrigerant pressure information includes: If the refrigerant pressure information is not less than the preset pressure threshold, the target operating mode is the heat pump operating mode.

5. The method according to claim 4, characterized in that The determining the target working mode based on the refrigerant pressure information further includes: If the refrigerant pressure information is less than a preset pressure threshold, the target operating mode is a low-pressure heat pump protection mode.

6. The method according to claim 1, characterized in that When the non-heat pump operation mode is a low-temperature heat pump protection mode, determining the target operation mode of the air-conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information includes: If the ambient temperature information is not less than a preset temperature threshold, and the refrigerant pressure information is greater than or equal to a preset pressure threshold, the target operating mode is a heat pump operating mode.

7. The method according to claim 6, characterized in that The determining the target operating mode of the air conditioning system based on at least one of the ambient temperature information and the refrigerant pressure information further includes: If the ambient temperature information is less than a preset temperature threshold, the target operating mode is a low-temperature heat pump protection mode.

8. A control device for an air conditioning system, characterized in that: The device comprises: An acquisition module, used for acquiring ambient temperature information and refrigerant pressure information corresponding to the air-conditioning system if the current working mode of the air-conditioning system is a non-heat pump working mode; a determination module, configured to determine a target operating mode of the air conditioning system based on at least one of ambient temperature information and refrigerant pressure information; An operation module is used to operate the air conditioning system through a target working mode.

9. An air conditioning system, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 7 when executing the computer program.

10. A storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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