A PWM soft start open-loop control method and system based on a PTC heater

Abstract

The application belongs to the technical field of electric vehicles, and specifically provides a PWM soft start open-loop control method and system based on a PTC heater, wherein the method comprises the following steps: dividing total heating packs of the PTC heater into multiple column heating pack groups; proportionally dividing a power duty cycle from 0 to 100% into multiple gears, each gear corresponding to full opening of IGBT of one column heating pack group or full opening of IGBT of multiple column heating pack groups, and the difference between two adjacent gears being one column heating pack group; obtaining a requested power duty cycle of an upper computer, and on the basis of a current power duty cycle, gradually climbing or gradually descending IGBT corresponding to one column heating pack group until the current power duty cycle is equal to the requested power duty cycle. The control method has the advantages of small impact current, small glitch current, smooth current curve and the like, and in this mode, IGBT is in full opening or full closing state most of the time and in a modulation state for part of the time, so that the switching loss of IGBT is greatly reduced, the failure rate of IGBT is reduced, and the service life of IGBT is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, more particularly to a PWM soft start open-loop control method and system based on a PTC heater. BACKGROUND

[0002] With the rapid development of new energy vehicles, especially the development of high-voltage pure electric vehicles, the vehicle air conditioning heating scheme has changed, and the current trend is to use high-voltage PTC heaters to meet the needs of heating, defrosting, and defogging, etc.

[0003] The existing PTC heater mainly includes a plurality of heating modules, a plurality of control switches (commonly known as IGBT), a plurality of drive circuits, a high-voltage circuit, and a controller; the heating module includes a plurality of PTC heating modules; the control switch is connected between the high-voltage circuit and the heating module, the control end of the control switch is connected to the drive circuit, and the drive circuit is connected to the controller; the high-voltage circuit provides power for the heating module through the control switch; the controller sends a control signal to the drive circuit, the drive circuit generates a drive signal to drive the on-off of the control switch. The above-mentioned control switch, drive circuit, high-voltage circuit, and controller are usually installed on a control board.

[0004] At present, the existing PTC heater generally adopts a gear control mode, selects a gear according to the user's set temperature, and selects the corresponding heating module for heating by controlling the on-off of each control switch; this kind of gear on-off temperature control has a large temperature jump and poor comfort. In addition, when designing the above-mentioned control board, the number of drive circuits, control switches, etc. changes with the number of the above-mentioned PTC heating modules, that is, different power and different models of PTC heaters need to be designed with matching control boards, which is not conducive to platformization; and the control board of a high-power PTC heater product is large in size and occupies a large space. Gear control configures IGBT according to the number of heating core module groups; the more groups, the better the temperature control and the better the comfort, but the more IGBTs used, the higher the cost.

[0005] In addition, the control method of the PTC heater can also use the PWM control method of stepless adjustment, and the PWM control method is particularly prominent in the stepless adjustment of IGBT groups, which has the advantages of simple program, and the disadvantages of large impact current, large burr current, large power deviation in open-loop control, large IGBT switching loss, high IGBT failure rate, and short service life. SUMMARY

[0006] The present application aims at the technical problems of large burr current and large IGBT switching loss in the PWM control method of stepless adjustment of the PTC heater in the prior art.

[0007] The application provides a PWM soft start open loop control method based on a PTC heater, comprising the following steps:

[0008] S1, total heating packs of the PTC heater are divided into multiple column heating pack groups, each column heating pack group comprises at least one heating pack, wherein one column heating pack group is controlled by one IGBT;

[0009] S2, a power duty ratio is proportionally divided into multiple gears from 0 to 100%, each gear corresponds to full opening of IGBTs of one column heating pack group or full opening of IGBTs of multiple column heating pack groups, and a difference between two adjacent gears is one column heating pack group;

[0010] S3, a requested power duty ratio of an upper computer is acquired, and on the basis of a current power duty ratio, IGBTs corresponding to one column heating pack group are gradually turned on or gradually turned off until the current power duty ratio is equal to the requested power duty ratio.

[0011] Preferably, the S1 specifically comprises: total heating packs of the PTC heater are divided into four column heating pack groups, and the four column heating pack groups are controlled by four IGBTs respectively.

[0012] Preferably, the S2 specifically comprises:

[0013] When the number of IGBTs required by one gear exceeds a single column heating pack group, the gear is combined with full opening of IGBTs of multiple column heating pack groups, and the combination is selected based on the least number of columns required by the heating pack group combination.

[0014] Preferably, the gradually turning on or gradually turning off in the S3 specifically comprises: IGBTs corresponding to one column heating pack group are gradually turned on or gradually turned off by PWM, and IGBTs of other column heating pack groups are in full opening or full closing state at this time.

[0015] Preferably, the S3 specifically comprises:

[0016] If the requested power duty ratio of the upper computer is lower than the current power duty ratio;

[0017] When the corresponding gear of the requested power duty ratio of the upper computer is zero, i.e. the requested power duty ratio is zero, IGBTs of all column heating pack groups are instantaneously turned off;

[0018] When the request power duty ratio of the upper computer corresponds to a non-zero gear, i.e., the request power duty ratio is non-zero, the IGBT of the corresponding column of the heating pack group that is not fully open is closed, and then the IGBT state of the corresponding column of the heating pack group that needs to be changed is modulated in turn. S3, the request power duty ratio of the upper computer is acquired, and the IGBT corresponding to a column of the heating pack group is modulated gradually to full opening or gradually decreased on the basis of the current power duty ratio, until the current power duty ratio is equal to the request power duty ratio

[0019] Preferably, the S3 specifically comprises: issuing a PWM instruction by the heating controller of the electric vehicle to control the IGBT, and the PTC heater and the heating controller of the electric vehicle communicate through a CAN line or a LIN line.

[0020] The application also provides a PWM soft start open loop control system based on a PTC heater, which is used for implementing the PWM soft start open loop control method based on the PTC heater and comprises:

[0021] A power duty ratio acquisition module is configured to acquire the request power duty ratio of the upper computer and the current power duty ratio of the PTC heater.

[0022] A control analysis module is configured to divide the total heating pack of the PTC heater into a plurality of column groups of heating packs, and each column group of heating packs comprises at least one heating pack, wherein one column group of heating packs is controlled by one IGBT.

[0023] Then, the power duty ratio is proportionally divided into a plurality of gears from 0 to 100%, each gear corresponds to the full opening of the IGBT of one column group of heating packs or the full opening of the IGBT of a plurality of column groups of heating packs, and the difference between two adjacent gears is one column group of heating packs.

[0024] Finally, the IGBT corresponding to a column group of heating packs is modulated gradually to full opening or gradually decreased, until the current power duty ratio is equal to the request power duty ratio.

[0025] The application also provides an electronic device comprising a memory and a processor, wherein the processor is configured to implement the steps of the PWM soft start open loop control method based on the PTC heater when executing a computer management program stored in the memory.

[0026] The application also provides a computer readable storage medium having a computer management program stored thereon, wherein the computer management program is configured to implement the steps of the PWM soft start open loop control method based on the PTC heater when executed by a processor.

[0027] Beneficial effects: the PWM soft start open loop control method and system based on the PTC heater provided by the application, wherein the method comprises the following steps: S1, dividing the total heating package of the PTC heater into multiple column heating package groups, each column heating package group comprising at least one heating package, wherein one column heating package group is controlled by one IGBT; S2, proportionally dividing the power duty ratio from 0 to 100% into multiple gears, each gear corresponding to the full opening of the IGBT of one column heating package group or the full opening of the IGBT of multiple column heating package groups, and the difference between adjacent two gears being one column heating package group; S3, obtaining the requested power duty ratio of the upper computer, and on the basis of the current power duty ratio, the IGBT corresponding to one column heating package group is gradually turned on to full opening or gradually turned off until the current power duty ratio is equal to the requested power duty ratio. Compared with the PWM stepless adjustment mode of the PTC heater of the traditional electric vehicle, the control method has the advantages of small impact current, small burr current, smooth current curve, etc., and in this mode, the IGBT is mostly in the full-on or full-off state, and is in the modulation state for a small part of the time, which greatly reduces the switching loss of the IGBT, reduces the failure rate of the IGBT, and improves the service life of the IGBT. The algorithm of the application is simple, the output current is smooth, the impact current and burr current are small, the failure rate of the IGBT is reduced, the service life of the IGBT is prolonged, and both gear control and stepless adjustment control methods can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A flow chart of the PWM soft start open loop control method based on the PTC heater provided by the application is provided.

[0029] Figure 2 A possible hardware structure schematic diagram of an electronic device provided by the application is provided.

[0030] Figure 3 A possible hardware structure schematic diagram of a computer readable storage medium provided by the application is provided. DETAILED DESCRIPTION

[0031] The specific embodiments of the application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the application, but are not used to limit the scope of the application.

[0032] Figure 1 The PWM soft start open loop control method based on the PTC heater provided by the application comprises the following steps:

[0033] S1, dividing the total heating package of the PTC heater into multiple column heating package groups, each column heating package group comprising at least one heating package, wherein one column heating package group is controlled by one IGBT;

[0034] S2, proportionally divide the power duty ratio from 0 to 100% into multiple gears, each gear corresponds to the full opening of the IGBT of one column of heating package groups or the full opening of the IGBT of multiple columns of heating package groups, and the difference between adjacent two gears is one column of heating package groups;

[0035] S3, obtain the requested power duty ratio of the upper computer, and gradually climb or gradually decrease the IGBT corresponding to one column of heating package groups on the basis of the current power duty ratio until the current power duty ratio is equal to the requested power duty ratio.

[0036] Wherein, the gradual climb or gradual decrease of the IGBT corresponding to one column of heating package groups is a stepless speed change mode, which is realized by using the control mode of gradually changing PWM, and the IGBT can be fixed in the PWM modulation state, not necessarily full open or full closed. In this way, a core control strategy table can be formed, and the IGBT modulation can be realized according to the core control strategy table, and finally the current power duty ratio is slowly changed into the requested power duty ratio according to the gradient.

[0037] Wherein, the core control strategy table is as follows:

[0038]

[0039]

[0040] In the core control strategy table, the first column corresponds to the power percentage request, and the remaining columns are the opening state of each IGBT, which needs to be theoretically converted or laboratory calibrated.

[0041] According to the power percentage request of the upper computer, the opening mode of the IGBT is executed according to the core control strategy table row by row to the power percentage request, and in the execution process, only one IGBT is controlled by the PWM signal, and the remaining IGBTs are in the closed or full open state. Among them, the closing action of the IGBT is completed instantaneously, while the full opening of the IGBT needs to be slowly modulated to climb to 100% opening, and each IGBT is in the modulation state in turn to avoid the same IGBT being in the modulation state for a long time. In the core control strategy table, the first column corresponds to the power percentage request, and the remaining columns are the opening state of each IGBT, which needs to be theoretically converted or laboratory calibrated.

[0042] Compared with the PWM stepless adjustment mode of the PTC heater of the traditional electric vehicle, the control method has the advantages of small impact current, small burr current, smooth current curve, etc., and in this mode, the IGBT is in full-on or full-off state most of the time and in a modulation state for a part of the time, so that the switching loss of the IGBT is greatly reduced, the failure rate of the IGBT is reduced, and the service life of the IGBT is improved. The algorithm is simple, the output current is smooth, the impact current and the burr current are small, the failure rate of the IGBT is reduced, the service life of the IGBT is prolonged, and the two control methods of gear control and stepless adjustment can be realized.

[0043] In a further scheme, the number of heating bags in the heating bag group in the latter column is not less than the number of heating bags in the heating bag group in the former column. As shown in the core control strategy table, there are a total of 4 columns, the first column has 2 heating bag groups, the second column has 4 heating bag groups, and the third column and the fourth column each have 6 heating bag groups.

[0044] In a further scheme, when the number of IGBTs required to be fully on for one gear exceeds the number of heating bag groups in a single column, the gear is combined with the IGBTs of the heating bag groups in multiple columns to be fully on, and the combination is selected based on the minimum number of columns required by the heating bag group combination. For example, when the gear is 4, the ratio corresponds to 44, that is, the power duty cycle is 44%, and at this time, the number of heating bags required to be fully on is 8. Searching the core control strategy table can know that the first column and the third column can be combined to achieve it.

[0045] In a further scheme, the S3 specifically comprises: dividing each of the gears into a first gear, a second gear, …, and an nth gear, when the requested power duty cycle of the upper computer corresponds to the kth gear, based on the current gear, each time the gear is modulated to climb or drop one gear until it becomes the kth gear; wherein n and k are natural numbers. For example, the current gear is 1, and the requested power duty cycle corresponds to gear k=3, so first modulate to climb to gear 2, and then modulate to climb to gear 3.

[0046] In a further scheme, each time the gear is modulated to climb or drop one gear until it becomes the kth gear in the S3 specifically comprises: adjusting the IGBT of a column of heating bag groups by a PWM mode, and the IGBT of the heating bag group in other columns is in a full-on or full-off state. For example, when adjusting gear 5 from gear 4, keep the state of the IGBT of each column of heating bags unchanged, instantaneously close the 2 IGBTs of the first column, and modulate the 4 IGBTs of the second column from the closed state to the fully-on state, so as to adjust gear 5 from gear 4.

[0047] In a further scheme, the S3 specifically comprises:

[0048] If the requested power duty cycle of the upper computer is lower than the current power duty cycle; then

[0049] When the corresponding gear of the request power duty ratio of the upper computer is zero, that is, the request power duty ratio is zero, the IGBT of all the heating pack groups of the column is instantaneously closed;

[0050] When the corresponding gear of the request power duty ratio of the upper computer is not zero, that is, the request power duty ratio is not zero, the IGBT of the heating pack group of the corresponding column that is not fully open is closed, and then the IGBT state of the corresponding column heating pack group that needs to be changed is modulated in turn.

[0051] Specifically, when the PTC heater obtains a power duty ratio request, the PTC response duty ratio climbs from the first row to the power duty ratio request row according to the core control strategy table, so that a single IGBT climbs to full opening through PWM modulation state, and other IGBTs are fully closed or fully open, and only one IGBT is in a modulation state at any time. Similarly, when the PTC heater is in a high power duty ratio and obtains a low power duty ratio request, if the request is 0, the IGBT group is instantaneously closed, and if the request is not 0, the IGBT that is not fully open in the core control strategy table is closed, and the IGBT that needs to be modulated climbs from 0 to the target duty ratio. This strategy reduces the impact current, burr current and IGBT switching loss, and increases the service life of the IGBT.

[0052] For example, the current gear is 5, and the request power duty ratio corresponds to gear 4, which means that the gear is to be lowered. When the gear is lowered, the IGBT of the corresponding column can be closed according to the core control strategy table.

[0053] In a further scheme, the S3 specifically comprises: issuing a PWM instruction through the heating controller of the electric vehicle to control the IGBT, and the PTC heater and the heating controller of the electric vehicle communicate through a CAN line or a LIN line.

[0054] In a specific implementation scenario, assume that the total number of heating pack groups is 18, which is divided into 4 groups, and the number of heating packs per column is 2:4:6:6. When the first row "power duty ratio" is 10%, that is, the total assembly needs to be started 10% power, that is, the request power duty ratio of the upper computer is 10%, which is equivalent to 1.8 heating packs, that is, 2 groups of heating pack IGBTs are started 90% duty ratio. In this way, the vehicle can obtain accurate heating pack opening combination according to the demand power and request power duty ratio, and realize precise power control. If the load is a PTC, the first row "power duty ratio" in the core control strategy table can be calibrated by using laboratory equipment to calibrate the different combinations of IGBT-controlled heating packs, and the core control strategy table is formulated to realize linear power output.

[0055] The embodiment of the present application also provides a PWM soft start open loop control system based on a PTC heater, which is used for realizing the PWM soft start open loop control method based on the PTC heater and comprises:

[0056] a power duty cycle acquisition module, used for acquiring a requested power duty cycle of an upper computer and a current power duty cycle of the PTC heater;

[0057] a control analysis module, used for dividing total heating packs of the PTC heater into a plurality of heating pack groups, and each heating pack group comprises at least one heating pack, wherein one heating pack group is controlled by one IGBT;

[0058] then, the power duty cycle is proportionally divided into a plurality of gears from 0 to 100%, each gear corresponds to full opening of the IGBT of one heating pack group or full opening of the IGBT of a plurality of heating pack groups, and a difference between two adjacent gears is one heating pack group;

[0059] finally, the IGBT corresponding to one heating pack group is gradually turned on or gradually turned off until the current power duty cycle is equal to the requested power duty cycle.

[0060] Please refer to Figure 2 The embodiment of the present application provides an embodiment schematic view of an electronic device. As shown in the figure, Figure 2 The embodiment of the present application provides an electronic device, which comprises a memory 1310, a processor 1320, a computer program 1311 stored in the memory 1310 and capable of running on the processor 1320, and the processor 1320 realizes the following steps when executing the computer program 1311: S1, total heating packs of a PTC heater are divided into a plurality of heating pack groups, and each heating pack group comprises at least one heating pack, wherein one heating pack group is controlled by one IGBT;

[0061] S2, a power duty cycle is proportionally divided into a plurality of gears from 0 to 100%, each gear corresponds to full opening of the IGBT of one heating pack group or full opening of the IGBT of a plurality of heating pack groups, and a difference between two adjacent gears is one heating pack group;

[0062] S3, a requested power duty cycle of an upper computer is acquired, and on the basis of a current power duty cycle, the IGBT corresponding to one heating pack group is gradually turned on or gradually turned off until the current power duty cycle is equal to the requested power duty cycle.

[0063] Please refer to Figure 3 The embodiment of the present application provides an embodiment schematic view of a computer readable storage medium. As shown in the figure, Figure 3As shown, the embodiment provides a computer readable storage medium 1400, which stores a computer program 1411, and the computer program 1411 is executed by a processor to implement the following steps: S1, dividing the total heating package of the PTC heater into multiple column heating package groups, and each column heating package group includes at least one heating package, wherein one column heating package group is controlled by one IGBT;

[0064] S2, proportionally dividing the power duty ratio from 0 to 100% into multiple gears, each gear corresponds to the full opening of the IGBT of one column heating package group or the full opening of the IGBT of multiple column heating package groups, and the difference between adjacent two gears is one column heating package group;

[0065] S3, obtaining the requested power duty ratio of the upper computer, and on the basis of the current power duty ratio, the IGBT corresponding to one column heating package group is gradually turned on or gradually turned off until the current power duty ratio is equal to the requested power duty ratio.

[0066] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0067] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0068] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system), and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocks Figure 1 The functions specified in one flow or multiple flows and / or blocks

[0069] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the Figure 1 function specified in the flow or flows and / or blocks Figure 1 of the block or blocks.

[0070] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions that are executed on the computer or other programmable apparatus provide steps for implementing the Figure 1 function specified in the flow or flows and / or blocks Figure 1 of the block or blocks.

[0071] While the preferred embodiments of the application have been described, additional variations and modifications can be made to the embodiments by those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to cover all such additional variations and modifications as fall within the scope of the application.

[0072] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A PWM soft start open loop control method based on PTC heater, characterized in that, The method comprises the following steps: S1, dividing the total heating package of the PTC heater into multiple column heating package groups, each column heating package group comprising at least one heating package, wherein one column heating package group is controlled by one IGBT; S2, proportionally dividing the power duty ratio from 0 to 100% into multiple gears, each gear corresponding to the full opening of the IGBT of one column heating package group or the full opening of the IGBT of multiple column heating package groups, and the difference between two adjacent gears being one column heating package group; S3, obtaining the requested power duty ratio of the upper computer, and gradually climbing or gradually descending the IGBT corresponding to one column heating package group on the basis of the current power duty ratio until the current power duty ratio is equal to the requested power duty ratio; the gradually climbing or gradually descending in S3 specifically comprises: enabling the IGBT corresponding to one column heating package group to gradually climb or gradually descend to full opening or full closing through PWM, and at this time, the IGBT of other column heating package groups is in full opening or full closing state; the gear interval between adjacent gears is a stepless adjustment mode, and in the stepless adjustment mode, only one IGBT is in PWM modulation state, and the other IGBTs are in on or off state.

2. The PWM soft start open loop control method based on PTC heater according to claim 1, characterized in that, S1 specifically comprises: dividing the total heating package of the PTC heater into 4 column heating package groups, and controlling the 4 column heating package groups through 4 IGBTs one by one.

3. The PWM soft start open loop control method based on PTC heater according to claim 2, characterized in that, S2 specifically comprises: When the number of IGBTs required by one gear exceeds a single column heating package group, the gear is combined with the full opening of the IGBT of multiple column heating package groups, and the combination is selected based on the least number of columns required by the heating package group combination.

4. The PWM soft start open loop control method based on PTC heater according to claim 1, characterized in that, S3 specifically comprises: If the requested power duty ratio of the upper computer is lower than the current power duty ratio; When the corresponding gear of the requested power duty ratio of the upper computer is zero, i.e. the requested power duty ratio is zero, the IGBT of all column heating package groups is closed instantaneously; When the corresponding gear of the requested power duty ratio of the upper computer is not zero, i.e. the requested power duty ratio is not zero, the IGBT of the column heating package group that is not fully opened is closed, and then the IGBT state of the corresponding column heating package group that needs to be changed is modulated in turn; S3, obtaining the requested power duty ratio of the upper computer, and gradually climbing or gradually descending the IGBT corresponding to one column heating package group on the basis of the current power duty ratio until the current power duty ratio is equal to the requested power duty ratio.

5. The PWM soft start open loop control method based on PTC heater according to claim 1, characterized in that, S3 specifically comprises: issuing a PWM instruction through the heating controller of the electric vehicle to control the IGBT, and the PTC heater and the heating controller of the electric vehicle communicate through a CAN line or a LIN line.

6. A PWM soft start open loop control system based on PTC heater, characterized in that, The system is used to implement the PWM soft start open loop control method based on the PTC heater according to any one of claims 1-5, and comprises: a power duty ratio acquisition module for obtaining the requested power duty ratio of the upper computer and the current power duty ratio of the PTC heater; a control analysis module for dividing the total heating package of the PTC heater into multiple column heating package groups, each column heating package group comprising at least one heating package, wherein one column heating package group is controlled by one IGBT; Then, the power duty ratio from 0 to 100% is proportionally divided into multiple gears, each gear corresponds to the full opening of IGBT of one column of heating package groups or the full opening of IGBT of multiple columns of heating package groups, and the difference between adjacent two gears is one column of heating package groups; Finally, the IGBT corresponding to one column of heating package groups is gradually turned on or gradually turned off until the current power duty ratio is equal to the requested power duty ratio.

7. An electronic device, comprising: The memory, the processor, the processor is used to execute the computer management class program stored in the memory, and the steps of the PTC heater-based PWM soft start open loop control method according to any one of claims 1-5 are realized.

8. A computer-readable storage medium, characterized in that, The computer management class program is stored on the memory, and the steps of the PTC heater-based PWM soft start open loop control method according to any one of claims 1-5 are realized when the computer management class program is executed by the processor.

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