KR100770711B1 - Compressor control device of air conditioner for rolling stocks and control method thereof - Google Patents

Abstract

A compressor control device of an air conditioner for rolling stocks and control method thereof are provided to enable selective driving of compressors depending on increase and decrease of cooling loads, so that each compressor can have similar driving frequency and driving time. A compressor control device of an air conditioner for rolling stocks consists of at least one air conditioner controller(100) connected to a central control unit. The air conditioner controller comprises a serial communication unit(110), a real-time clock chip time compensation unit(130), a time table(140), a former compressor setting unit(160), and an air conditioner load controller(150). The serial communication unit receives an absolute time value from the central control unit. The real-time clock chip time compensation unit is capable of time compensation of the real-time clock chip based on the received absolute time value. The time table includes a predetermined authorized driving time of the compressor. The former compressor setting unit determines a compressor to be driven ahead based on the absolute time value. The air conditioner load controller drives a specific air conditioner based on the absolute time value compensated by the real-time clock chip time compensation unit, the time table, and the compressor to be driven ahead set by the former compressor setting unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a compressor control apparatus and a control method for a railway vehicle air conditioner,

1 is a schematic overall block diagram of a compressor control apparatus for a radiator for a railway vehicle according to the present invention,

FIG. 2 is a detailed block diagram of the interior of the cooler controller 100 of FIG. 1,

FIG. 3 is a diagram illustrating an example of a compressor right to operate using a time table according to the first embodiment of the present invention; FIG.

FIG. 4 is a flowchart illustrating a method of setting a head compressor according to a second embodiment of the present invention;

5 is an exemplary view showing a compressor operation table 300 indicating whether the operation compressors are operated according to the respective cooling states after the setting of the head compressors is completed according to the third embodiment of the present invention.

Description of the Related Art

10: central controller,

11: first cooler time zone,

12: second cooler time zone,

14: third cooler time zone,

16: fourth cooler time zone,

18: Fifth cooler time zone,

20: sixth cooler time zone,

30, 32, 34, 36, 38, 40: dead zone,

100: a cooler controller,

110: serial communication unit,

130: Real-time clock time correction unit,

140: Time table,

150: cooler load controller,

160: Head compressor setting section,

170: room temperature sensor,

175: Outdoor temperature sensor,

200: cooling system,

300: Compressor operation table,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor control apparatus and a control method of a cooling apparatus for a railway vehicle.

Generally, a railroad car air conditioner is one of the largest electrical loads in a vehicle while being a necessary device for maintaining a pleasant environment in a vehicle. Until now, the air conditioner for railway vehicles has been mainly composed of a cooler having a refrigerant cycle using a reciprocating compressor.

Generally, in a general application example other than the air-conditioner for a railway vehicle, a starting method which can be implemented by a circuit such as Y-? Connection is used for a cooling system using a reciprocating compressor. Or a soft start method using an inverter or the like to reduce the inrush current generated during start-up.

In the case of a radiator air conditioner, a compact and lightweight radiator is required due to a narrow installation space and the characteristics of a railway vehicle as a moving body. Also, since the cost ratio of the controller is higher than that of the entire air conditioner system, it is difficult to use a separate starting system or soft start system. On the other hand, due to the characteristics of the moving body, the capacity of the power supply of the air conditioner is severely limited.

In the case of a cooling apparatus for a railway car, a plurality of refrigerant cycles are formed using two or more compressors in order to improve control performance. When two or more compressors are used in this way, the control performance is improved in the summer season. However, circuit design has been designed to operate head-to-head at the turnaround time or at the bottom of the cooling-only air-conditioning system, but there may be a severe imbalance in the total operating time and the number of starts between the compressor and the compressor programmed in the microprocessor.

This imbalance in operating time and number of starts results in a reduction in the durability of a particular compressor, resulting in a lower MTBF (Mean Time Before Failure) of the product as a whole.

In particular, in the case of electric trains, there may occur a number of interruptions during which the power supply is interrupted during operation. In order to prevent the hot start, the delay time must elapse for a certain period of time in order to restart the stopped compressor. Therefore, when the head compressor is fixed, there is a disadvantage that the compressor service time of the compressor is greatly reduced and the comfort in the vehicle is reduced.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is a primary object of the present invention to provide a technology for radically preventing the simultaneous start- It is possible not only to prevent simultaneous start-up, but also to prevent the compressor from being started simultaneously in the railway vehicles in one combination even when the compressor is started by stopping and restarting the compressor according to the load change during operation of the cooler, And exclusively gives the compressor operating right to the controller of the specific air conditioner according to a preset activation right time table.

A second object of the present invention is to alternately control two or more compressor operating sequences in accordance with an increase and decrease in cooling load and to provide an alternating operation by selecting a head operating compressor by date And to provide alternate operation control by selecting the head operation compressor by the operation control and the startup sequence.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments, which are to be described in connection with the accompanying drawings.

The controller of the compressor for a railway car air-conditioner according to the present invention comprises a central controller 10 and at least one controller 100 connected to the central controller 10,

A serial communication unit 110 for receiving an absolute time value received from the central controller 10;

A real time clock chip time correcting unit (130) for correcting the time of the real time clock chip based on the received absolute time value;

A time table (140) having a predetermined compressor start time zone;

And a coolant load controller (150) for activating only the specific coolant based on the absolute time value corrected by the real time clock chip time correction unit (130) and the time table (140) Lt; / RTI >

The apparatus further includes a head compressor setting unit (160) for setting a head compressor on the basis of the absolute time value,

The cooler load controller 150 preferably activates only the specific cooler based on the corrected absolute time value, the time table 140 and the head compressor set by the head compressor setting unit 160. [

In addition, each cooler is composed of a plurality of compressors, and

It is preferable to further include an alternate driving means for alternately driving a plurality of compressors with respect to the cooler specified by the cooler load controller 150. [

In addition,

The head compressor can be designated based on the date data transmitted from the real-time clock chip correcting unit 130. [

Then, the alternate driving means can designate the head compressor by sequentially alternating the previous start order.

In addition, the time table 140 may be configured to have a dead-time determined between a time-of-authority time zone and a time zone of the compressor, and the dead zone may range from 1 second to 3 seconds.

The above object of the present invention is also achieved by a method of controlling a compressor for a railway car air conditioner comprising at least one controller (100) connected to a central controller (10) and a central controller (10)

Receiving an absolute time value from the central controller 10;

Real time clock chip time correction unit 130 corrects the time of the real time clock chip based on the received absolute time value;

And selecting and activating only the specific air conditioner based on the absolute time value corrected by the real time clock chip time correcting unit 130 and the data read in the time table 140 by the air conditioner load controller 150 The control method for the compressor of the railway car air-conditioner.

In addition, the method may further include alternately operating a plurality of compressors for the specified cooler.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings showing a preferred embodiment.

FIG. 1 is a schematic block diagram of a compressor control apparatus for a railway car air-conditioner according to the present invention, and FIG. 2 is a detailed block diagram of the interior of the controller 100 of FIG. As shown in FIGS. 1 and 2, the components of the present invention largely consist of a central controller 10 and a plurality of cooler controllers 100. The controller (100) has a serial communication unit (110) capable of serial data communication with the central controller (10). The serial communication unit 110 periodically receives the current absolute time value from the central controller 10 through communication. By correcting the time of the real-time clock chip inside the cooler controller 100 based on the absolute time value transmitted to the real-time clock chip time corrector 130 by the serial communication unit 110, all of the coolers in one combination of the railway cars And have a synchronized absolute time value.

The transmission of the periodic absolute time value is periodically transmitted from the central controller 10 within a period of a maximum of 0.5 seconds. The configuration of absolute time values to be transmitted is as follows. That is, one byte (0 to 99), one byte (1 to 12), one byte (1 to 31), one byte (0 to 23) ), And one byte (0 to 59). The cooler controller 100 corrects the absolute time of the real-time clock chip by periodically initializing the real-time clock chip with the transmitted absolute time value.

The real time clock chip time correction unit 130 corrects the time according to the absolute time received from the central controller 10 via the serial communication unit 110. [ The time table 140 incorporates the pre-determined compressor startup authority as data in advance in accordance with the cycle configuration of the cooling system 200. The indoor temperature sensor 170 and the outdoor temperature sensor 175 are configured to transmit the measured sensor signals to the cooler load controller 150. [ The cooler load controller 150 performs cooling load control based on the input sensor signals. The head compressor setting unit 160 has a configuration for setting a head compressor for alternate operation.

(Embodiment 1)

FIG. 3 is a diagram illustrating an example of the authority to start a compressor using the time table 140 according to the first embodiment of the present invention. As shown in Figure 3, the time table 140 is configured to specify a time zone (i. E., A cooler time zone) that secures the operating rights of an exclusive compressor by time sharing a specific time period with the number of coolers installed in the train . Between the cooler time zones 11, 12, 14, 16, 18, 20, there is a dead band 30, 32, 34, 36, 38, 40).

Particularly, in the case of Fig. 3, a case in which one railway train is composed of six air conditioners having respective controllers is illustrated. When the combination of railway vehicles is changed, the number of air conditioners can be reduced or increased.

The dead zones 30, 32, 34, 36, 38 and 40, which do not have the right to activate any compressor, are arranged at intervals of two seconds between the time zones 11, 12, 14, 16, 18 and 20 of the respective coolers . A synchronization error of an absolute time value that may occur between controllers due to problems such as communication delay due to the arrangement of such dead zones 30, 32, 34, 36, 38, 40 may be allowed up to one second.

Each of the six coolers has a first cooler time zone 11, a second cooler time zone 12, a third cooler time zone 14, a fourth cooler time zone 16, a fifth cooler time zone 18, And has an exclusive activation right for the corresponding air conditioner in the sixth air conditioner time zone 20. For example, in the case of January 1, 00 1: 00: 1, the first air conditioner has compressor right authority. In the case of January 1, 00, 1:00:9, no air conditioner has the right to start the compressor. Also, in the case of 1:00:11 on January 1, 00 00, the second air conditioner has a right to operate the compressor. In Fig. 3, the starting authority of the compressor is circulated in a cycle of one minute.

This allows each cooler controller 100 to determine whether it has an exclusive compressor start-up authority based on the predetermined time table 140 and the absolute time value provided by the real-time clock chip time corrector 130, The compressor start control is performed only when it has authority. In this case, when the absolute time value given by the real-time clock chip time correction unit 130 is one byte (0 to 59) and the number of the compressor in the cooling machine is increased and it is necessary to use the time region widely, Minute (0 to 59).

The cooler load controller 150 internally confirms the right to operate the compressor with a predetermined delay time between the start times of the compressors to be controlled even if the temperature condition is a load condition in which one or more compressors are operated. This prevents simultaneous start-up of the compressors which may occur in one cooler.

(Second Embodiment)

4 is a flowchart illustrating a method of setting a head compressor according to a second embodiment of the present invention. As shown in FIG. 4, this is to alternately control the operation sequence of two or more compressors in accordance with the increase and decrease of the cooling load, and is executed by the head compressor setting unit 160. That is, since the number of compressors constituting the cooler may be various, a case where four compressors exist in one cooler will be exemplified. Various modifications and changes are possible when the cooling system configuration of a railway car is changed.

First, in order to alternately control the compressor operation sequence, a head compressor is set first. The setting method of the head compressor is largely a method of setting the current head compressor on the basis of the date setting method and the previous head compressor setting.

First, in order to set the head compressor, the head compressor setting unit 160 assigns a unique number to a plurality of compressors constituting the cooler (S10). For example, "1" is assigned to the first compressor, "2" is assigned to the second compressor, "3" is assigned to the third compressor, and "4" is assigned to the fourth compressor. After assigning the unique number, the head compressor setting unit 160 confirms the alternate driving mode designated by the user (S12). The user can select and change the alternate driving mode as needed.

If the alternate operation mode designated by the user is "date ", the value (1 to 31) transmitted from the real-time clock chip correcting unit 130 is divided by the number of all compressors (4) And assigns a compressor having a corresponding unique number to the first compressor (S40).

If the alternating operation mode designated by the user is the "startup sequence ", firstly, it is confirmed whether the initial cooling mode is in operation (S14). If it is in the initial cooler operation state (S14: YES), the head compressor is designated as the initial value of the head compressor unique number (S15). If it is not the initial cooling mode (S14: NO), the head compressor is changed (S16) at a point when it is necessary to reduce the number of compressors to be driven by the compressor operation information given from the cooler load control unit 150 (S16: YES) . When the head compressor is changed, if the existing head compressor specific number is "1" (S18: YES), this is changed to "2" (S17). If the existing head compressor specific number is "2" (S20: YES), this is changed to "3" (S21). When the existing head compressor specific number is "3" (S22: YES), it is changed to "4 " (S23). Finally, when the existing head compressor specific number is "4" (S22: NO), it is changed to "1" (S24). The set head compressor is transmitted to the cooler load controller 150 (S30), and the setting process is repeatedly performed.

(Third Embodiment)

5 is an exemplary view showing a compressor operation table 300 indicating whether the operation compressors are operated according to the respective cooling states after the setting of the head compressors is completed according to the third embodiment of the present invention. As shown in FIG. 5, in the cooler load controller 150, the predetermined compressor operation table 300 for each cooling state is read in accordance with the number of required compressor operations, and is used in the compressor alternation operation.

The compressor operation table 300 displays the compressors operated in accordance with the required compressor operation number (1, 2, 3, 4) and the unique number (1, 2, 3, 4) of the head compressor. For example, if the number of required compressors to be operated 310 is two and the head compressor is the fourth compressor (320), the compressor actually operated is the compressor 330 having the unique number "1 " "

Therefore, according to one embodiment of the present invention as described above, it is possible to limit the inrush current due to compressor starting with respect to one vehicle combination without using a separate starting system or soft start system. Also, the absolute time value is shared through the communication between the coolers installed in the vehicle 1, and each cooler controller can exclusively have the compressor start authority by referring to the predetermined time table according to the absolute time. Therefore, only one pushing operation can be performed in one vehicle at a specific moment, and as a result, it is possible to prevent the simultaneous start of the compressors, thereby limiting the inrush current of the entire vehicle.

Also, the compressor cycle selection method causes the compressors to alternate operations, so that each of the compressors has a similar start frequency and operation time. As a result, each compressor can improve the MTBF of the overall product. In addition, when selecting the method of selecting the head compressor according to the start sequence, the delay time for preventing the overheat start is reduced, so that the compressor operation service time of the compressor can be maximized.

Although the present invention has been described in connection with the preferred embodiments set forth above, it will be readily appreciated by those skilled in the art that various other modifications and variations are possible without departing from the spirit and scope of the invention, And modifications are intended to fall within the scope of the appended claims.

Claims (9)

A controller for a compressor for a railway car, comprising a central controller (10) and at least one controller (100) connected to the central controller (10), the controller (100) A serial communication unit 110 for receiving an absolute time value received from the central controller 10; A real time clock chip time correcting unit (130) for correcting the time of the real time clock chip based on the received absolute time value; A time table (140) having a predetermined compressor start time zone; And a coolant load controller (150) for activating only a specific cooler based on the absolute time value corrected by the real time clock chip time correcting unit (130) and the time table (140) Control device. The method according to claim 1, Further comprising a head compressor setting unit (160) for setting a head compressor on the basis of the absolute time value, Wherein the cooler load controller (150) activates only a specific air conditioner based on the corrected absolute time value, the time table (140) and the head compressor set by the head compressor setting unit (160) Of the compressor. The method according to claim 1, Each cooler is composed of a plurality of compressors, and Further comprising an alternating operation unit operable to alternately operate the plurality of compressors with respect to the cooler specified by the cooler load controller (150). 4. The image forming apparatus according to claim 3, And designates a head compressor on the basis of the date data transmitted from the real-time clock chip correcting unit (130). 4. The image forming apparatus according to claim 3, And the first compressor is sequentially designated by sequentially alternating the previous startup sequence. 2. The method of claim 1, wherein the time table (140) Wherein the controller is configured such that a dead time determined for each of the time zone zone and the time zone zone of the compressor is set. 7. The compressor control apparatus of claim 6, wherein the dead zone is in the range of 1 second to 3 seconds. A method for controlling a compressor of a radiator for a railway vehicle, comprising a central controller (10) and at least one radiator controller (100) connected to the central controller (10) Receiving an absolute time value from the central controller (10); The real time clock chip time correction unit 130 corrects the time of the real time clock chip based on the received absolute time value; And selecting and activating only the specific air conditioner based on the absolute time value corrected by the real time clock chip time correcting unit 130 and the data read in the time table 140 by the air conditioner load controller 150 Of the compressor of the railway car air-conditioner. 9. The method of claim 8, Further comprising: alternately operating a plurality of compressors with respect to the specified cooler.

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