KR102188006B1 - Apparatus and method for controlling electro-compressor of air conitioner system for vehicle - Google Patents

Abstract

The present invention relates to an apparatus and method for controlling an electric compressor of a vehicle air conditioning system using a waiting time value mapped to discharge pressure information in a state of turning off the electric compressor of a vehicle air conditioning system.
The electric compressor control apparatus of the vehicle air conditioning system according to the present invention includes an electric compressor operation detection unit 200 that detects a turn off state of the electric compressor 410 included in the vehicle air conditioning system 10, and an electric compressor. Inverter waiting time value mapped to the discharge pressure range of the electric compressor 410 received from the discharge pressure sensing unit 300 and the discharge pressure sensing unit 300 to detect the discharge pressure of 410 is set in advance in the driving waiting time table It is characterized in that it comprises a control unit 100 for checking at, generating an electric compressor driving signal based on the waiting time value, and transmitting the electric compressor driving signal to the vehicle air conditioning system 10.

Description

Electric compressor control device and method of vehicle air conditioning system {APPARATUS AND METHOD FOR CONTROLLING ELECTRO-COMPRESSOR OF AIR CONITIONER SYSTEM FOR VEHICLE}

The present invention relates to a compressor control method, and more particularly, to a control method of an electric compressor for a vehicle air conditioner using discharge pressure information of the electric compressor.

Automobiles are equipped with an air conditioning system for indoor cooling and heating. This air conditioning system includes a compressor that compresses a low-temperature, low-pressure gaseous refrigerant drawn from an evaporator into a high-temperature, high-pressure gaseous refrigerant and sends it to a condenser. Such a compressor includes a mechanical type that performs compression by rotating an engine as a driving source and an electric type that uses a motor as a driving source.

An electro-compressor is a device that compresses air by rotating an electric motor as electrical energy and rotating the compressor by means of a belt or coupling.

In general, an electric compressor has an inverter installed on one side of a compressor housing to adjust the number of revolutions of a driving motor in order to variably adjust the cooling efficiency of an air conditioning system when external load conditions change.

However, in the conventional electric compressor, there is a risk of damage to the inverter and scroll in the process of restarting the compressor by driving the motor when the motor of the electric compressor is stopped regardless of the discharge pressure condition of the compressor. In some cases, the motor was turned off.

1 is a flowchart of a conventional method for controlling an electric compressor.

As shown in Fig. 1, the conventional electric compressor control method determines whether the electric compressor is normally started through an inverter, and if it does not start normally, the compressor is restarted to determine whether it is normally started, and if it does not start again, the compressor is restarted. The restarting was repeated a certain number of times to enable stable control of the compressor.

In the repeating step of restarting the compressor, a waiting time is allowed until the suction/discharge pressure difference is reduced, so that stable start-up of the compressor is possible.

However, simply having a uniformly determined waiting time could not solve the problem caused by the difference in pressure on both sides of the electric compressor, so there was still a risk of damage to the scroll and the inverter.

Korean Patent Application Publication No. 2010-0136645 (published on December 29, 2010)

The present invention is to solve the above problem, the present invention is based on the discharge pressure information at the turn-off time of the predetermined driving waiting time table by using the discharge pressure information at the time when the motor of the electric compressor is turned off (Turn Off). An object of the present invention is to provide an apparatus and method for controlling an electric compressor of a vehicle air conditioning system having a waiting time.

The present invention provides an electric compressor control apparatus for a vehicle air conditioning system, and the electric compressor control apparatus of the vehicle air conditioning system of the present invention detects an electric compressor operation that detects a turn off state of an electric compressor included in the vehicle air conditioning system. In the turn-off state of the electric compressor, a discharge pressure detection unit for sensing the discharge pressure of the electric compressor and an inverter waiting time value mapped to the discharge pressure range of the electric compressor received from the discharge pressure detection unit are set in advance. It checks in the time table, generates an electric compressor drive signal based on the inverter waiting time value, and may include a control unit for transmitting the electric compressor drive signal to the vehicle air conditioning system.

In addition, the present invention provides a method for controlling an electric compressor of an air conditioning system for a vehicle, and the method for controlling an electric compressor of an air conditioning system for a vehicle of the present invention includes the steps of detecting a turn-off state of an electric compressor included in the vehicle air conditioning system, In the off state, detecting a discharge pressure of the electric compressor, and checking an inverter waiting time value mapped to a discharge pressure range corresponding to the discharge pressure in a preset driving waiting time table.

In addition, after a time corresponding to the inverter waiting time value has elapsed, the step of transmitting a driving signal for the electric compressor to the vehicle air conditioning system may be further included.

Furthermore, the inverter included in the vehicle air conditioning system may further include driving a driving motor according to the driving signal of the electric compressor.

In addition, the electric compressor driving signal may include time information corresponding to the inverter waiting time value, and after the time corresponding to the inverter waiting time value elapses, the inverter may further include driving the driving motor.

In addition, the inverter waiting time value mapped to the discharge pressure range may include a value determined according to the specifications of the electric compressor.

According to an embodiment of the present invention, the difference between the suction/discharge pressure of the electric compressor during the standby time is reduced by having a waiting time before driving the electric compressor corresponding to the discharge pressure of the electric compressor at the time when the operation of the electric compressor is stopped. Motor compressor can be restarted under low load conditions.

In addition, the present invention can provide a driving environment suitable for the specifications of each electric compressor by setting the waiting time according to the specifications of the electric compressor.

1 is a flowchart of a conventional method for controlling an electric compressor.
2 is a block diagram showing a configuration of an electric compressor control apparatus of an air conditioning system for a vehicle according to an embodiment of the present invention.
3 is a flowchart illustrating a method of controlling an electric compressor of an air conditioning system for a vehicle according to an embodiment of the present invention.
4 is a flowchart illustrating a method of controlling an electric compressor of an air conditioning system for a vehicle according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to elements of each drawing, it should be noted that the same elements have the same numerals as possible even if they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Various aspects of the invention are described below. It is to be understood that the inventions presented herein may be embodied in a wide variety of forms and any particular structure, function, or all of them presented herein are exemplary only. Based on the inventions presented herein, a person of ordinary skill in the art to which the present invention pertains may implement one aspect presented herein independently from any other aspects, and two or more such aspects may be implemented in various ways. You will understand that it can be combined with. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects described herein. In addition, such an apparatus may be implemented or such a method may be practiced using a structure, function, or structure and functionality other than or in addition to one or more aspects described herein.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

2 is a block diagram showing the configuration of an electric compressor control apparatus of the vehicle air conditioning system 10 according to an embodiment of the present invention.

As shown in FIG. 2, the electric compressor 410 control device of the vehicle air conditioning system 10 includes a control unit 100, an electric compressor operation detection unit 200, a discharge pressure detection unit 300, and an air conditioning system 10 for a vehicle. And a database 500.

As shown in FIG. 2, the vehicle air conditioning system 10 may include an electric compressor 410, a drive motor 420, and an inverter 430.

Although there is no difference in the configuration or operation principle of a general compressor, the electric compressor 410 may discharge a refrigerant by receiving a rotational force of an electric motor driven by using power charged in a battery as a driving force. Since the electric compressor 410 is driven using power charged in the battery, it can exhibit a certain performance regardless of the vehicle speed or engine speed of the vehicle.

The electric compressor 410 compresses the refrigerant and the number of revolutions may be changed according to the amount of cooling required.

The driving motor 420 may drive the electric compressor 410.

The inverter 430 may receive DC power, convert the DC power to an AC voltage, and operate a drive motor 420 for driving the electric compressor 410. The inverter 430 may be electrically connected to the driving motor by a terminal or a bus bar in order to variably adjust the rotational speed of the driving motor 420 to adjust the discharge amount of the refrigerant circulating along the cycle of the air conditioning system.

The inverter 430 includes an IC including an IC in which an inverter operation program is stored, an insulated gate type bipolar transistor (IGBT), or an intelligent power module (IPM) equipped with a motor drive function, a regulator, an inductor, a capacitor, etc. A circuit board on which various circuit elements are mounted may be included.

That is, energy stored in the battery is transferred to the driving motor 420 through the inverter 430 and converted into physical energy, which is transferred to the electric compressor 410 to drive the electric compressor 410. That is, the driving force of the electric compressor 410 may be supplied from the battery through the inverter 430 and the driving motor 420.

The electric compressor operation detection unit 200 may detect whether the electric compressor 410 is operated. Specifically, a turn-on or turn-off state of the electric compressor 410 may be sensed through an electric compressor operation sensor.

The turn-off state is a state in which the operation of the electric compressor 410 is stopped, and the operation of the electric compressor 410 is stopped for any reason, such as a normal turn-off state of the electric compressor 410 or a turn-off state due to an error. It can contain the status.

The electric compressor operation detection unit 200 may detect the state of the electric compressor 410 in real time and transmit current state information of the electric compressor 410 to the control unit 100. In particular, it is possible to detect the state of the electric compressor in the turn-off state and transmit it to the controller.

The discharge pressure sensing unit 300 may detect the discharge pressure of the electric compressor 410. The discharge pressure detection unit 300 may detect the discharge pressure of the electric compressor 410 in real time through the discharge pressure sensor and transmit the current discharge pressure value of the electric compressor 410 to the control unit 100.

The discharge pressure of the electric compressor 410 may mean the pressure on the discharge side of the gas discharged from the compressor when the piston of the compressor compresses the gas and becomes high pressure, and the suction pressure may mean the pressure at the time of suction of the compressor. .

In the case where the electric compressor 410 is turned off, the control unit 100 decreases the pressure on the suction side of the electric compressor 410 and increases the pressure on the discharge side under a condition where the discharge pressure and the suction pressure of the electric motor are the same, that is, the normal pressure condition There will be a pressure difference on both sides. As the electric compressor 410 is driven, the pressure difference between both sides increases, and thus a load applied to the driving motor 420 may increase.

When the suction/discharge pressure difference increases, conditions in which it is difficult to drive again after the electric compressor 410 is turned off may be formed.

If the inverter 430 that operates the drive motor 420 is waited for a certain period of time until it starts driving again in the state where the electric compressor 410 is turned off, the suction/discharge pressure conditions naturally converge to the discharge side. The pressure decreases, the suction side pressure rises, and the pressure difference at both ends decreases.

The controller 100 may select a value of the waiting time corresponding to the discharge pressure range at the time when the electric compressor 410 is turned off to have the effect of reducing the difference in suction/discharge pressure as described above.

Specifically, the control unit 100 may generate a driving signal of the electric compressor 410 by selecting a waiting time mapped to the discharge pressure range of the electric compressor 410 from a predetermined driving waiting time table.

[Table 1] is a table showing the relationship between the discharge pressure and the waiting time according to an embodiment of the present invention as data of the driving waiting time table.

Discharge pressure
(bar) ~17 17-19 19~21 21~23 25~27 27~ waiting time
(sec) 3.0 3.5 4.0 5.0 6.0 7.0

The discharge pressure refers to information on the discharge pressure at the time when the electric compressor 410 is turned off, and the waiting time is from the time of turning off until the electric compressor 410 is driven through the inverter 430 and the drive motor 420 This may mean a time for the vehicle air conditioning system 10 to wait.

The waiting time may include a waiting time for stopping the operation of the inverter 430 receiving the driving signal of the electric compressor 410 to operate the driving motor 420. Alternatively, it may include a waiting time for the control unit 100 to wait before transmitting the electric compressor driving signal to the inverter 430 after checking in the driving waiting time table.

Specifically, when the turn-off state of the electric compressor 410 is transmitted to the control unit 100 through the electric compressor operation detection unit 200, the control unit 100 detects the electric compressor through the discharge pressure detection unit 300 ( 410) You can check the discharge pressure in the turn-off state. Further, the control unit 100 may extract the driving waiting time table from the database 500 and determine a waiting time within a range to which the discharge pressure belongs.

According to an embodiment of the present invention, the controller 100 may transmit a compressor driving signal to the inverter 430 after the waiting time elapses. The inverter 430 may receive a compressor driving signal to operate the driving motor 420, thereby driving the electric compressor 410.

For example, if it is confirmed that the discharge pressure at the time of turning off the electric compressor 410 is 18 bar according to [Table 1], it can be confirmed that the waiting time of 3.5 sec is mapped according to the driving waiting time table.

According to another embodiment of the present invention, the controller 100 may transmit a compressor driving signal including a waiting time of the inverter 430 to the vehicle air conditioning system 10. The inverter 430 may receive the compressor driving signal and operate the driving motor 420 after having an operation stop time equal to the waiting time included in the compressor driving signal.

Due to these processes, the vehicle air conditioning system 10 determines the waiting time until restart of the vehicle air conditioning system 10 with information on the discharge pressure in the state where the electric compressor 410 is turned off, and thus an efficient vehicle air conditioning system. It is possible to prevent the operation of (10) and the damage of the inverter 430.

The apparatus of the present invention may include a database 500. The database 500 may store information on discharge pressure, information on waiting time, information on a driving waiting time table, and information necessary for controlling the electric compressor 410 of the vehicle air conditioning system 10.

The database 500 may refer to a functional and structural combination of software and hardware for storing information corresponding to each database 500. The database 500 may be implemented as at least one table, and may further include a separate DBMS (Database Management System) for searching, storing, and managing information stored in the database 500. In addition, the database 500 may be implemented in various ways, such as a linked-list, a tree, and a relational database 500, and all data capable of storing information corresponding to the database 500 It may include a storage medium and a data structure.

3 is a flow chart showing a control method of the electric compressor 410 of the vehicle air conditioning system 10 according to an embodiment of the present invention.

As shown in FIG. 3, the air conditioning system according to an embodiment of the present invention may detect a turn-on/turn-off state of the electric compressor 410 through the electric compressor operation detection unit 200 (S1010). .

When the state of the electric compressor 410 detected through the electric compressor operation detection unit 200 is turned on, the control method of the electric compressor 410 of the vehicle air conditioning system 10 according to the present invention may be terminated.

The electric compressor operation detection unit 200 may detect a state in which the electric compressor 410 is turned off, whether the electric compressor 410 is in a normal operation interruption situation or an operation interruption condition due to an error.

The electric compressor operation detection unit 200 may transmit the current state of the electric compressor 410 to the control unit 100.

Accordingly, in the turn-off state of the electric compressor 410, the discharge pressure sensing unit 300 may check the discharge pressure of the electric compressor 410 (S1020).

During the driving of the electric compressor 410, since the pressure on the suction side of the electric compressor 410 decreases and the pressure on the discharge side increases, a pressure difference between both sides may occur. Accordingly, the control unit 100 may determine in real time the discharge pressure at the turn-off point of the electric compressor 410 through the discharge pressure detection unit 300.

Next, the control unit 100 may check the waiting time mapped to the range to which the discharge pressure at the turn-off time of the electric compressor 410 belongs in the driving waiting time table (S1030).

The driving waiting time table may be set differently according to compressor specifications. The table on the relationship between the preferred discharge pressure and the waiting time according to the compressor specification may be determined through an experiment, but is not limited thereto.

The controller 100 may wait so that a time corresponding to the waiting time checked in the driving waiting time table elapses (S1040).

This is to control the driving of the vehicle air conditioning system 10 through the waiting time in the control unit 100, and while the waiting time in the control unit 100 elapses, the suction/discharge pressure of the electric compressor 410 is This diminishing effect can occur.

After this waiting time has elapsed, the controller 100 may transmit a driving signal for the electric compressor to the inverter 430 of the vehicle air conditioning system 10 (S1050). In this case, the electric compressor driving signal may mean an electric compressor driving signal that does not include a signal for a waiting time.

The inverter 430 may receive a driving signal for the electric compressor and operate the driving motor 420 (S1060). Due to the operation of the driving motor 420, the electric compressor 410 may be switched from a turned-off state to a turned-on state.

4 is a flow chart showing a control method of the electric compressor 410 of the vehicle air conditioning system 10 according to another embodiment of the present invention.

As shown in FIG. 4, the air conditioning system according to an embodiment of the present invention may detect a turn-on/turn-off state of the electric compressor 410 through the electric compressor operation detection unit 200 (S2010). .

When the state of the electric compressor 410 detected through the electric compressor operation detection unit 200 is turned on, the control method of the electric compressor 410 of the vehicle air conditioning system 10 according to the present invention may be terminated.

The control unit 100 may check the state of the electric compressor 410 in the turn-on/turn-off state sensed through the electric compressor operation detection unit 200 in real time.

The discharge pressure detection unit 300 may check the discharge pressure of the electric compressor 410 (S2020). The discharge pressure detection unit 300 may transmit the discharge pressure of the electric compressor 410 to the control unit 100 in real time.

Next, the control unit 100 may check a waiting time mapped to a range to which the discharge pressure at the turn-off time of the electric compressor 410 belongs in the driving waiting time table (S2030).

The controller 100 may transmit an electric compressor drive signal including a waiting time for controlling the electric compressor 410 to the inverter 430 of the vehicle air conditioning system 10 (S2040).

The inverter 430 may receive a driving signal for the electric compressor and have a waiting time of not operating for a time corresponding to the waiting time included in the signal (S2050).

That is, it may mean that the control unit 100 does not transmit a driving signal after having a waiting time, but has a waiting time in the inverter 430 itself receiving the electric compressor driving signal.

After the above waiting time has elapsed, the inverter 430 may operate the driving motor 420 (S2060). The electric compressor 410 may be driven by the operation of the driving motor 420.

That is, due to the waiting time of the electric compressor that occurs while the electric compressor 410 is switched from the turn-off state to the turn-on state due to the above method, the electric compressor ( 410) can be restarted.

The foregoing description of the present invention is merely illustrative of the technical idea, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations within the scope not departing from the essential characteristics of the present invention. Accordingly, the embodiments described in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and are not limited to the technical idea of the present invention by these embodiments. The scope of protection of the present invention should be interpreted by the claims below, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

10: vehicle air conditioning system 100: control unit
200: electric compressor operation detection unit 300: discharge pressure detection unit
410: electric compressor 420: drive motor
430: inverter 500: database

Claims (11)

In the electric compressor control device of the vehicle air conditioning system 10,
An electric compressor operation detection unit 200 for detecting a turn-off state of the electric compressor 410 included in the vehicle air conditioning system 10 in real time;
A discharge pressure sensing unit 300 for detecting a discharge pressure at the time of turning off of the electric compressor 410 in real time; And
The inverter waiting time value mapped to the discharge pressure range of the electric compressor 410 received from the discharge pressure detection unit 300 in real time is checked in a preset driving waiting time table, and motorized based on the inverter waiting time value. A controller 100 for generating a compressor driving signal and transmitting the electric compressor driving signal to the vehicle air conditioning system 10;
Including,
The drive waiting time table has an inverter waiting time value set in advance according to a discharge pressure range independently of the suction pressure of the electric compressor (410). The electric compressor control device of the vehicle air conditioning system (10).
The method of claim 1, wherein the vehicle air conditioning system (10),
A drive motor 420 driving the electric compressor 410; And
An inverter 430 for receiving the electric compressor driving signal from the control unit 100 and operating the driving motor 420;
The electric compressor control device of the vehicle air conditioning system 10 further comprising a.
The method of claim 1, wherein the control unit 100,
The electric compressor control device of the vehicle air conditioning system (10), which transmits the driving signal of the electric compressor to the vehicle air conditioning system (10) after a time corresponding to the inverter waiting time value elapses.
The method of claim 1,
The electric compressor drive signal includes time information corresponding to the inverter standby time value,
The inverter 430 of the vehicle air conditioning system 10,
The electric compressor control device of the vehicle air conditioning system (10) for receiving the electric compressor drive signal and driving the electric compressor (410) after a time corresponding to the inverter waiting time value elapses.
The method of claim 1,
A database 500 for storing the driving waiting time table generated by mapping the inverter waiting time value corresponding to the discharge pressure range of the compressor;
The electric compressor control device of the vehicle air conditioning system 10 further comprising a.
The method of claim 1,
The inverter waiting time value corresponding to the discharge pressure range is a value predetermined according to the specifications of the electric compressor,
Electric compressor control device of the vehicle air conditioning system 10.
In the electric compressor control method of the vehicle air conditioning system 10,
Pre-setting a drive waiting time table indicating an inverter waiting time value according to a discharge pressure range independently from the suction pressure of the electric compressor 410 included in the vehicle air conditioning system 10;
Detecting a turn-off state of the electric compressor 410 included in the vehicle air conditioning system 10 in real time;
Sensing the discharge pressure at the time of turning off the electric compressor 410 in real time while the electric compressor 410 is turned off;
Checking an inverter waiting time value mapped to the discharge pressure range in the preset driving waiting time table; And
Generating an electric compressor driving signal based on the inverter waiting time value, and transmitting the electric compressor driving signal to the vehicle air conditioning system 10;
Including, the electric compressor control method of the vehicle air conditioning system 10.
The method of claim 7,
Transmitting an electric compressor drive signal to the vehicle air conditioning system 10 after a time corresponding to the inverter waiting time value has elapsed;
An electric compressor control method of the vehicle air conditioning system 10 further comprising a.
The method of claim 8,
An inverter (430) included in the vehicle air conditioning system (10) operating a drive motor (430) according to the driving signal of the electric compressor;
An electric compressor control method of the vehicle air conditioning system 10 further comprising a.
The method of claim 7,
The electric compressor driving signal includes time information corresponding to the inverter standby time value,
Driving the drive motor 420 by the inverter 430 after the vehicle air conditioning system receives the electric compressor driving signal and a time corresponding to the inverter standby time value has elapsed;
An electric compressor control method of the vehicle air conditioning system 10 further comprising a.
The method of claim 7,
Inverter waiting time value mapped to the discharge pressure range is a value determined according to specifications of the electric compressor, the electric compressor control method of the vehicle air conditioning system (10).

Images