阅读说明：本技术 变频电器、变频控制器及其控制方法 (Variable frequency electric appliance, variable frequency controller and control method thereof ) 是由 孙思佳 徐奔 胡慧军 于 2019-10-29 设计创作，主要内容包括：本发明提出一种变频电器、变频控制器及其控制方法,所述控制方法,包括：获取输入的方波控制信号在预设时间内的上升沿数量和下降沿数量；根据上升沿数量和下降沿数量计算方波控制信号的频率；根据方波控制信号的频率对变频负载进行控制。本发明实施例的变频控制器的控制方法,能够有效提高方波控制信号的频率检测的分辨率和精度,实现变频控制器对变频负载的精准控制。(The invention provides a variable frequency electric appliance, a variable frequency controller and a control method thereof, wherein the control method comprises the following steps: acquiring the number of rising edges and the number of falling edges of an input square wave control signal in a preset time; calculating the frequency of the square wave control signal according to the number of rising edges and the number of falling edges; and controlling the variable-frequency load according to the frequency of the square wave control signal. The control method of the variable frequency controller provided by the embodiment of the invention can effectively improve the resolution and precision of frequency detection of the square wave control signal and realize the precise control of the variable frequency controller on the variable frequency load.)

1. A control method of a variable frequency controller is characterized by comprising the following steps:

acquiring the number of rising edges and the number of falling edges of an input square wave control signal in a preset time;

calculating the frequency of the square wave control signal according to the number of the rising edges and the number of the falling edges;

and controlling the variable-frequency load according to the frequency of the square wave control signal.

2. The control method of claim 1, wherein said calculating the frequency of the square wave control signal according to the number of rising edges and the number of falling edges comprises:

calculating the pulse number of the square wave control signal in the preset time according to the number of the rising edges and the number of the falling edges;

and calculating the frequency of the square wave control signal according to the pulse number of the square wave control signal and the preset time.

3. The control method according to claim 2, wherein the calculating the number of pulses of the square wave control signal in the preset time according to the number of rising edges and the number of falling edges comprises:

calculating the sum of the rising edge number and the falling edge number to obtain the edge number;

and calculating the pulse number of the square wave control signal according to the number of the edges.

4. The control method according to claim 2, wherein the calculating the frequency of the square wave control signal according to the number of pulses of the square wave control signal and the preset time comprises:

and calculating the quotient of the pulse number of the square wave control signal and the preset time to obtain the frequency of the square wave control signal.

5. The control method according to claim 4, wherein the frequency of the square wave control signal is a non-integer, and the rounding is performed on the frequency of the square wave control signal according to a rounding principle.

6. The control method according to claim 1, wherein the preset time is twice as long as a unit time.

7. The method of claim 1, wherein the variable frequency load is a variable frequency compressor, and wherein controlling the variable frequency load according to the frequency of the square wave control signal comprises:

and controlling the rotating speed of the variable-frequency compressor according to the frequency of the square wave control signal.

8. A variable frequency controller, comprising:

the acquisition module is used for acquiring the number of rising edges and the number of falling edges of the input square wave control signal in preset time;

the calculating module is used for calculating the frequency of the square wave control signal according to the number of the rising edges and the number of the falling edges;

and the control module is used for controlling the variable frequency load according to the frequency of the square wave control signal.

9. The variable frequency controller according to claim 8, wherein the calculation module comprises:

the first calculating unit is used for calculating the pulse number of the square wave control signal in the preset time according to the rising edge number and the falling edge number;

and the second calculating unit is used for calculating the frequency of the square wave control signal according to the pulse number of the square wave control signal and the preset time.

10. The variable-frequency controller according to claim 9, wherein the first calculating unit is specifically configured to:

and calculating the sum of the number of the rising edges and the number of the falling edges to obtain the number of edges, and calculating the pulse number of the square wave control signal according to the number of the edges.

11. The variable frequency controller according to claim 9, wherein the second calculating unit is specifically configured to:

and calculating the quotient of the pulse number of the square wave control signal and the preset time to obtain the frequency of the square wave control signal.

12. The variable frequency controller according to claim 11, wherein the frequency of the square wave control signal is a non-integer number, and the frequency of the square wave control signal is rounded according to a rounding principle.

13. The variable frequency controller according to claim 8, wherein the preset time is twice the unit time.

14. The inverter controller according to claim 8, wherein the inverter load is an inverter compressor, and the control module is specifically configured to:

and controlling the rotating speed of the variable-frequency compressor according to the frequency of the square wave control signal.

15. A variable frequency electrical appliance, comprising: a variable frequency controller as claimed in any one of claims 8 to 14.

16. An electronic device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the method of controlling a variable frequency controller according to any of claims 1-7.

17. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method of controlling a variable frequency controller according to any one of claims 1-7.

Technical Field

The invention relates to the technical field of electric appliances, in particular to a control method of a variable frequency controller, the variable frequency controller and a variable frequency electric appliance with the variable frequency controller.

Background

With the enhancement of energy-saving and environment-friendly consciousness of consumers and the twelve-five national plan of energy conservation and emission reduction, the market share of frequency conversion electric appliances such as frequency conversion refrigerators is increased year by year, and the total electricity consumption of the frequency conversion electric appliances is also sharply increased, so that the accurate and efficient frequency conversion compressor rotating speed control is beneficial to improving the accuracy and stability of the performance of the frequency conversion electric appliances and is beneficial to accurately controlling and reducing the energy consumption of the frequency conversion electric appliances. The frequency detection error of the variable frequency controller can cause the fluctuation deviation of the actual rotating speed of the variable frequency compressor of the variable frequency electric appliance from top to bottom at the target rotating speed, so that the fluctuation of the refrigerating capacity, the power consumption and the like of the variable frequency electric appliance is caused, the overall performance and the stability of the electric appliance are adversely affected, and the accuracy of the performance detection of the electric appliance is affected.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, a first objective of the present invention is to provide a control method for a variable frequency controller, which can effectively improve the resolution and precision of frequency detection of a square wave control signal, and achieve precise control of a variable frequency load by the variable frequency controller.

The second objective of the present invention is to provide a variable frequency controller.

The third purpose of the invention is to provide a variable frequency electric appliance.

A fourth object of the invention is to propose an electronic device.

A fifth object of the present invention is to propose a computer-readable storage medium.

In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for controlling a variable frequency controller, including: acquiring the number of rising edges and the number of falling edges of an input square wave control signal in a preset time; calculating the frequency of the square wave control signal according to the number of the rising edges and the number of the falling edges; and controlling the variable-frequency load according to the frequency of the square wave control signal.

According to the control method of the frequency conversion controller, the number of rising edges and the number of falling edges of an input square wave control signal in a preset time are obtained, then the frequency of the square wave control signal is calculated according to the number of the rising edges and the number of the falling edges, and finally the frequency conversion load is controlled according to the frequency of the square wave control signal. Therefore, the method can effectively improve the resolution and precision of frequency detection of the square wave control signal and realize the precise control of the variable frequency controller on the variable frequency load.

In addition, the control method of the variable frequency controller proposed according to the above embodiment of the present invention may further have the following additional technical features:

according to an embodiment of the present invention, said calculating the frequency of the square wave control signal according to the number of rising edges and the number of falling edges comprises: calculating the pulse number of the square wave control signal in the preset time according to the number of the rising edges and the number of the falling edges; and calculating the frequency of the square wave control signal according to the pulse number of the square wave control signal and the preset time.

According to an embodiment of the present invention, the calculating the number of pulses of the square wave control signal in the preset time according to the number of rising edges and the number of falling edges includes: calculating the sum of the rising edge number and the falling edge number to obtain the edge number; and calculating the pulse number of the square wave control signal according to the number of the edges.

According to an embodiment of the present invention, the calculating the frequency of the square wave control signal according to the number of pulses of the square wave control signal and the preset time includes: and calculating the quotient of the pulse number of the square wave control signal and the preset time to obtain the frequency of the square wave control signal.

According to an embodiment of the present invention, the frequency of the square wave control signal is a non-integer, and the frequency of the square wave control signal is rounded according to a rounding principle.

According to one embodiment of the invention, the preset time is twice the unit time.

According to an embodiment of the present invention, the variable frequency load is a variable frequency compressor, and the controlling the variable frequency load according to the frequency of the square wave control signal includes: and controlling the rotating speed of the variable-frequency compressor according to the frequency of the square wave control signal.

In order to achieve the above object, a second embodiment of the present invention provides a variable frequency controller, including: the acquisition module is used for acquiring the number of rising edges and the number of falling edges of the input square wave control signal in preset time; the calculating module is used for calculating the frequency of the square wave control signal according to the number of the rising edges and the number of the falling edges; and the control module is used for controlling the variable frequency load according to the frequency of the square wave control signal.

According to the frequency conversion controller provided by the embodiment of the invention, the number of rising edges and the number of falling edges of an input square wave control signal in a preset time are obtained through the obtaining module, the frequency of the square wave control signal is calculated through the calculating module according to the number of the rising edges and the number of the falling edges, and the control module controls a frequency conversion load according to the frequency of the square wave control signal. Therefore, the frequency conversion controller can effectively improve the resolution and precision of frequency detection of the square wave control signal, and further realize the precise control of the frequency conversion controller on the frequency conversion load.

In addition, the frequency conversion controller proposed according to the above embodiment of the present invention may further have the following additional technical features:

according to an embodiment of the invention, the calculation module comprises: the first calculating unit is used for calculating the pulse number of the square wave control signal in the preset time according to the rising edge number and the falling edge number; and the second calculating unit is used for calculating the frequency of the square wave control signal according to the pulse number of the square wave control signal and the preset time.

According to an embodiment of the present invention, the first calculating unit is specifically configured to: and calculating the sum of the number of the rising edges and the number of the falling edges to obtain the number of edges, and calculating the pulse number of the square wave control signal according to the number of the edges.

According to an embodiment of the present invention, the second calculating unit is specifically configured to: and calculating the quotient of the pulse number of the square wave control signal and the preset time to obtain the frequency of the square wave control signal.

According to an embodiment of the present invention, the frequency of the square wave control signal is a non-integer, and the frequency of the square wave control signal is rounded according to a rounding principle.

According to one embodiment of the invention, the preset time is twice the unit time.

According to an embodiment of the present invention, the variable frequency load is a variable frequency compressor, and the control module is specifically configured to: and controlling the rotating speed of the variable-frequency compressor according to the frequency of the square wave control signal.

In order to achieve the above object, a third aspect of the present invention provides a variable frequency electric appliance, which includes the above variable frequency controller.

According to the variable frequency electric appliance provided by the embodiment of the invention, through the variable frequency controller, the resolution and precision of frequency detection of the square wave control signal can be effectively improved, the variable frequency controller can accurately control a variable frequency load, and the accuracy of performance detection of the variable frequency electric appliance is further improved.

To achieve the above object, a fourth aspect of the present invention provides an electronic device, including: the frequency conversion controller comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein when the processor executes the program, the frequency conversion controller realizes the control method of the frequency conversion controller.

The electronic equipment provided by the embodiment of the invention can effectively improve the resolution and precision of frequency detection of the square wave control signal, realize the precise control of the variable frequency controller on the variable frequency load, and further improve the accuracy of performance detection of the variable frequency electric appliance.

In order to achieve the above object, a fifth embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the control method of the variable frequency controller.

According to the computer-readable storage medium of the embodiment of the invention, by executing the control method of the variable frequency controller, the resolution and precision of frequency detection of the square wave control signal can be effectively improved, the variable frequency controller can accurately control the variable frequency load, and the accuracy of performance detection of the variable frequency electrical appliance can be further improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a flow chart of a method of controlling a variable frequency controller according to an embodiment of the invention;

FIG. 2 is a timing diagram of a square wave control signal of a related art variable frequency controller;

FIG. 3 is a timing diagram of a square wave control signal for a variable frequency controller according to one embodiment of the present invention;

FIG. 4 is a block schematic diagram of a variable frequency controller according to an embodiment of the invention;

FIG. 5 is a block schematic diagram of a variable frequency controller according to one embodiment of the present invention;

fig. 6 is a block schematic diagram of a variable frequency appliance according to an embodiment of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A control method of a variable frequency controller, and a variable frequency electric appliance having the variable frequency controller according to an embodiment of the present invention are described below with reference to the accompanying drawings.

Fig. 1 is a flowchart of a control method of a variable frequency controller according to an embodiment of the present invention. As shown in fig. 1, a method for controlling a variable frequency controller according to an embodiment of the present invention includes:

and S1, acquiring the rising edge number and the falling edge number of the input square wave control signal in a preset time. The preset time is software gate time which is twice of unit time.

And S2, calculating the frequency of the square wave control signal according to the rising edge number and the falling edge number.

According to an embodiment of the present invention, calculating the frequency of the square wave control signal according to the number of rising edges and the number of falling edges includes: calculating the pulse number of the square wave control signal in the preset time according to the number of rising edges and the number of falling edges; and calculating the frequency of the square wave control signal according to the pulse number and the preset time of the square wave control signal.

According to an embodiment of the present invention, the calculating the number of pulses of the square wave control signal in the preset time according to the number of rising edges and the number of falling edges includes: calculating the sum of the number of rising edges and the number of falling edges to obtain the number of edges; and calculating the pulse number of the square wave control signal according to the number of the edges.

According to an embodiment of the present invention, calculating the frequency of the square wave control signal according to the pulse number and the preset time of the square wave control signal comprises: and calculating the quotient of the pulse number of the square wave control signal and the preset time to obtain the frequency of the square wave control signal.

And S3, controlling the variable frequency load according to the frequency of the square wave control signal.

According to an embodiment of the present invention, the frequency of the square wave control signal is a non-integer, and the rounding process is performed on the frequency of the square wave control signal according to a rounding principle.

Specifically, the frequency detection method of the square wave control signal of the variable frequency controller is to capture a rising edge and a falling edge of the square wave control signal in software gating time, an MCU (micro controller Unit) is set to enable the rising edge and the falling edge to trigger an interrupt count of a counter, and the software gating time is set to be 2 × T, where T represents Unit time. Triggering a counter by using a rising edge and a falling edge, and counting the number N of rising edges in the gate time_upAnd the number of falling edges N_downOne square wave period comprises a rising edge and a falling edge, and the pulse number N of the square wave control signal in the gate time is equal to (N)_up+N_down) 2, from which the frequency F of the square-wave control signal N/2T (N) is derived_up+N_down) and/4T. The frequency of the square wave control signal can be an integer or a non-integer, and when the frequency is a non-integer, the frequency of the square wave control signal is rounded offAnd (5) performing row rounding processing. And the variable-frequency controller controls the variable-frequency load according to the frequency of the finally obtained square wave control signal. Therefore, the resolution and the precision of frequency detection of the square wave control signal can be effectively improved, and the frequency conversion controller can accurately control the frequency conversion load.

For convenience of description of the present invention, a frequency detection method of a square wave control signal of a frequency conversion controller of the related art is described in comparison with the frequency detection method of the present invention.

Assuming that the variable frequency load is a variable frequency compressor, the rotating speed of the variable frequency compressor is n, the number of pole pairs of the variable frequency compressor is p, the variable frequency compressor is 6 slots and 4 poles, the unit time T is 1 second, and the period of 7 square wave control signals is set in the unit time.

As shown in fig. 2, in the frequency detection method of the related art, the software gate time is a unit time T, and the number of rising edges N_upNumber of falling edges N of 7_down7, only triggering the rising edge, wherein the quantity of the rising edge in the gate time is counted as N_upDue to the error of ± 1 pulse period, the frequency F of the square wave control signal is (Nup ± 1)/T is (7 ± 1) Hz, the target rotation speed of the inverter compressor is 210RPM, the actual rotation speed n of the compressor is 60F/p is 60 (7 ± 1)/2 is (210 ± 30) RPM, and the rotation speed deviation of ± 30RPM is generated.

As shown in FIG. 3, in the frequency detection method of the present invention, the software gate time is 2T per unit time, and the number of rising edges N_upNumber of falling edges N of 7_down7, triggering the rising edge and the falling edge simultaneously, and counting the sum of the rising edge and the falling edge in the gate time as the edge number (N)_up+N_down) The frequency F of the square wave control signal is equal to (N) due to the error of ± 1 edge statistics_up+N_downThe target rotation speed of the compressor is not deviated from the actual rotation speed, as can be seen from the results of ± 1)/4T ═ 7 ± 0.25 Hz, the square wave signal detection frequency F ═ 7Hz, the target rotation speed of the compressor is 210RPM, and the actual rotation speed n ═ 60 ═ F/p ═ 60 ═ 7/2 ═ 210RPM, which are calculated according to the rounding rule.

In summary, a main control board of an inverter (e.g., an inverter air conditioner, a refrigerator, etc.) sends square wave control signals with different frequencies to an inverter controller, the inverter controller detects a frequency value of the square wave control signal sent by the main control board and converts the frequency value into a target rotation speed instruction, and an inverter load (e.g., an inverter compressor) is driven to operate according to a target rotation speed, but a frequency detection method of the square wave control signal in the related art generates an error of ± 1 square wave pulse number, an improved frequency detection method of the square wave control signal of the inverter controller triggers counting by using a rising edge and a falling edge at the same time, software gate time is set to be 2 times of unit time, and integer frequency of the square wave control signal is calculated by rounding rules. By the frequency detection method for the control signal of the variable frequency controller, the target rotating speed deviation caused by the pulse number error of the square wave control signal can be effectively reduced, the accurate rotating speed control of the variable frequency controller is realized, and the accurate refrigeration effect of the variable frequency compressor is further improved.

In summary, according to the control method of the variable frequency controller in the embodiment of the present invention, the number of rising edges and the number of falling edges of the input square wave control signal in a preset time are obtained, then the frequency of the square wave control signal is calculated according to the number of rising edges and the number of falling edges, and finally the variable frequency load is controlled according to the frequency of the square wave control signal. Therefore, the method can effectively improve the resolution and precision of frequency detection of the square wave control signal and realize the precise control of the variable frequency controller on the variable frequency load.

Fig. 4 is a block schematic diagram of a variable frequency controller according to an embodiment of the invention. As shown in fig. 4, the variable frequency controller according to the embodiment of the present invention includes: an acquisition module 10, a calculation module 20 and a control module 30.

The acquiring module 10 is configured to acquire the number of rising edges and the number of falling edges of an input square wave control signal within a preset time, the calculating module 20 is configured to calculate the frequency of the square wave control signal according to the number of rising edges and the number of falling edges, and the controlling module 30 is configured to control the variable frequency load according to the frequency of the square wave control signal.

According to an embodiment of the present invention, as shown in fig. 5, the calculation module 20 includes: a first calculation unit 21 and a second calculation unit 22. The first calculating unit 21 is configured to calculate the number of pulses of the square wave control signal in a preset time according to the number of rising edges and the number of falling edges, and the second calculating unit 22 is configured to calculate the frequency of the square wave control signal according to the number of pulses of the square wave control signal and the preset time.

According to an embodiment of the present invention, the first calculating unit 21 is specifically configured to: and calculating the sum of the number of rising edges and the number of falling edges to obtain the number of edges, and calculating the pulse number of the square wave control signal according to the number of edges.

According to an embodiment of the present invention, the second computing unit 22 is specifically configured to: and calculating the quotient of the pulse number of the square wave control signal and the preset time to obtain the frequency of the square wave control signal.

According to an embodiment of the present invention, the frequency of the square wave control signal is a non-integer, and the rounding process is performed on the frequency of the square wave control signal according to a rounding principle.

According to one embodiment of the present invention, the preset time is twice the unit time.

According to an embodiment of the present invention, the variable frequency load may be an variable frequency compressor, and the control module 30 is specifically configured to: and controlling the rotating speed of the variable frequency compressor according to the frequency of the square wave control signal.

It should be noted that details not disclosed in the variable frequency controller according to the embodiment of the present invention refer to details disclosed in the control method of the variable frequency controller according to the embodiment of the present invention, and are not repeated herein.

According to the frequency conversion controller provided by the embodiment of the invention, the number of rising edges and the number of falling edges of an input square wave control signal in a preset time are obtained through the obtaining module, the frequency of the square wave control signal is calculated through the calculating module according to the number of the rising edges and the number of the falling edges, and the control module controls a frequency conversion load according to the frequency of the square wave control signal. Therefore, the frequency conversion controller can effectively improve the resolution and precision of frequency detection of the square wave control signal, and further realize the precise control of the frequency conversion controller on the frequency conversion load.

Fig. 6 is a block schematic diagram of a variable frequency appliance according to an embodiment of the invention. As shown in fig. 6, the variable frequency electric appliance 1000 according to the embodiment of the present invention includes the variable frequency controller 100.

In an embodiment of the present invention, the inverter appliance 1000 may be an inverter refrigerator, an air conditioner, or the like.

According to the variable frequency electric appliance provided by the embodiment of the invention, through the variable frequency controller, the resolution and precision of frequency detection of the square wave control signal can be effectively improved, the variable frequency controller can accurately control a variable frequency load, and the accuracy of performance detection of the variable frequency electric appliance is further improved.

In addition, an embodiment of the present invention further provides an electronic device, which includes: the frequency conversion controller comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, and when the processor executes the program, the frequency conversion controller realizes the control method of the frequency conversion controller.

The electronic equipment provided by the embodiment of the invention can effectively improve the resolution and precision of frequency detection of the square wave control signal, realize the precise control of the variable frequency controller on the variable frequency load, and further improve the accuracy of performance detection of the variable frequency electric appliance.

In addition, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the control method of the variable frequency controller described above.

According to the computer-readable storage medium of the embodiment of the invention, by executing the control method of the variable frequency controller, the resolution and precision of frequency detection of the square wave control signal can be effectively improved, the variable frequency controller can accurately control the variable frequency load, and the accuracy of performance detection of the variable frequency electrical appliance can be further improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.