WO2020073488A1

WO2020073488A1 - Method, device, unit and air conditioning system for controlling cylinder cutting of compressor

Info

Publication number: WO2020073488A1
Application number: PCT/CN2018/122371
Authority: WO
Inventors: 刘华; 刘群波; 许克; 李龙飞; 戎耀鹏
Original assignee: 珠海格力电器股份有限公司
Priority date: 2018-10-10
Filing date: 2018-12-20
Publication date: 2020-04-16
Also published as: CN109538457A; CN109538457B

Abstract

A method, device, unit and air conditioning system for controlling the cylinder cutting of a compressor. The method comprises: receiving a work mode conversion instruction (S101); once the work mode conversion instruction is received, adjusting system control parameters so that operating parameters meet commutation conditions of a four-way valve, and controlling the commutation of the four-way valve (S102); and controlling a compressor to switch from a single-cylinder operating mode to a two-cylinder operating mode (S103). Therefore, four-way valve commutation is first controlled, and once the four-way valve is commutated, cylinder cutting is then performed to avoid the problem in which system differential pressure fluctuations caused by the commutation of the four-way valve makes it difficult to maintain a two-cylinder state after cylinder cutting. Priority is given to considering factors that cause the system differential pressure to fluctuate, so as to ensure that the compressor stably maintains a two-cylinder operating state, thereby ensuring the energy efficiency of the unit and improving the usage experience of a user.

Description

Method, device, unit and air conditioning system for controlling cylinder cutting of compressor

This application requires the priority of the Chinese patent application filed on October 10, 2018 in the China Patent Office with the application number 201811180119.6 and the invention titled "A method, device and unit for controlling the cylinder cut of the compressor, and the air conditioning system". The entire contents are incorporated in this application by reference.

Technical field

The invention relates to the technical field of generating units, in particular, to a method and device for controlling cylinder cutting of a compressor, a generating unit and an air conditioning system.

Background technique

At present, in order to solve the problems of low load and poor energy efficiency of the multi-line group, the single and double cylinder switching technology of the compressor has been developed. In the actual operation of the unit, the failure of the compressor to cut the cylinder is more common. For example, during the cylinder cutting process of the compressor, due to the changes of components such as fans and electronic expansion valves in the unit, it is likely to affect the normal cylinder cutting of the compressor. Another example: After the compressor is switched to dual-cylinder operation, the four-way valve commutation will make the dual-cylinder operating state of the compressor difficult to maintain, thereby reducing the energy efficiency of the unit and affecting the user experience.

In view of the problem that the four-way valve commutation in the prior art easily causes the dual-cylinder state of the compressor to be difficult to maintain, no effective solution has been proposed yet.

Summary of the invention

Embodiments of the present invention provide a method, device, unit, and air conditioning system for controlling cylinder cutting of a compressor to solve the problem that the four-way valve commutation in the prior art easily causes the dual-cylinder state of the compressor to be difficult to maintain.

To solve the above technical problems, in a first aspect, an embodiment of the present invention provides a method for controlling a cylinder cut of a compressor, the method including:

Receive work mode conversion instructions;

After receiving the working mode conversion command, adjust the system control parameters so that the operating parameters meet the four-way valve commutation conditions, and control the four-way valve commutation;

Controlling the compressor to switch from the single-cylinder operating mode to the double-cylinder operating mode.

Further, before receiving the work mode conversion instruction, the method further includes:

It is determined that the compressor needs to be switched from the single-cylinder operating mode to the double-cylinder operating mode.

Determine that the compressor is in a dual-cylinder operating mode;

Before controlling the commutation of the four-way valve, the method further includes:

Controlling the compressor to switch from the double-cylinder operating mode to the single-cylinder operating mode.

Further, after controlling the commutation of the four-way valve, the method further includes:

Determine whether the system pressure difference is within the preset system pressure difference interval;

If not, continue to adjust the system control parameters so that the system pressure difference is within the preset system pressure difference interval;

Wherein, the preset system pressure differential interval is a system pressure differential interval required for the compressor to maintain the dual-cylinder operating mode.

Further, determining that the compressor needs to be switched from the single-cylinder operating mode to the dual-cylinder operating mode includes:

If the currently required operating frequency of the compressor is greater than the maximum frequency threshold that can be reached in the single-cylinder operating mode of the compressor, it is determined that the compressor needs to be switched from the single-cylinder operating mode to the dual-cylinder operating mode;

Wherein, the current operating frequency of the compressor is determined according to at least one of the following three factors: the difference between the set temperature value and the ambient temperature value, the set fan gear, and the internal unit of the unit where the compressor is located Capacity size.

Further, the operating parameters are the system pressure difference and the operating frequency of the compressor, and adjusting the system control parameters so that the operating parameters satisfy the four-way valve commutation conditions includes:

Increase the operating frequency at a preset speed up to the maximum frequency threshold;

During the increase of the operating frequency at a preset speed, the system control parameters are adjusted so that the system pressure difference and the operating frequency satisfy the four-way valve commutation conditions.

Further, the four-way valve commutation condition is: the system pressure difference is greater than or equal to the four-way valve commutation preset pressure difference; and the difference between the operating frequency and the four-way valve commutation preset frequency is less than or Equal to a preset difference; wherein, the operating frequency is less than or equal to the preset frequency of the four-way valve commutation.

Further, adjusting the system control parameters includes at least one of the following steps:

Reduce the speed of outdoor fans and indoor fans;

Reduce the number of steps for the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve.

Further, in the case where adjusting the system control parameters includes reducing the rotation speed of the outdoor fan and indoor fan, reducing the rotation speed of the outdoor fan and indoor fan includes: controlling the outdoor fan and the indoor fan to be turned off;

In the case where adjusting the system control parameters includes reducing the steps of the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve, reducing the steps of the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve includes: controlling the outdoor unit electronic expansion valve The expansion valve and the electronic expansion valve of the indoor unit are closed.

Further, after controlling the compressor to switch from the single-cylinder operating mode to the double-cylinder operating mode, the method further includes:

In the case of adjusting the system control parameters including reducing the rotational speed of the outdoor fan and the indoor fan, controlling the outdoor fan and the indoor fan to resume normal working conditions;

When adjusting the system control parameters includes reducing the number of steps of the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve, control the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve to return to a normal working state.

Further, the normal working state is an automatic control state.

Further, before controlling the compressor to switch from the single-cylinder operating mode to the double-cylinder operating mode, the method further includes: providing single-cylinder torque compensation to the compressor.

Further, after controlling the compressor to switch from the single-cylinder operating mode to the double-cylinder operating mode, the method further includes: providing double-cylinder torque compensation to the compressor.

Further, before controlling the compressor to switch from the single-cylinder operating mode to the dual-cylinder operating mode, the method includes:

Control the first solenoid valve to be powered off, and the second solenoid valve to be powered on, so that the variable volume port of the compressor is in a low-pressure state; wherein, the first solenoid valve can make the exhaust port of the compressor and the The variable volume port communicates, and the exhaust port is in a high-pressure state; the second solenoid valve enables the suction port of the compressor to communicate with the variable volume port, and the suction port is in a low-pressure state.

Further, controlling the compressor to switch from the single-cylinder operating mode to the double-cylinder operating mode includes:

Controlling the first solenoid valve to be powered on, and the second solenoid valve to be powered off, so that the variable volume port of the compressor is in a high-pressure state, wherein the first solenoid valve can make the exhaust port of the compressor and the The variable volume port communicates, and the exhaust port is in a high-pressure state; the second solenoid valve enables the suction port of the compressor to communicate with the variable volume port, and the suction port is in a low-pressure state.

Further, the working mode includes a cooling mode or a heating mode.

In a second aspect, an embodiment of the present invention provides a unit for performing the method of the first aspect. The unit includes: a main controller, a compressor, a drive controller for the compressor, and a cross valve,

The main controller is used to trigger the unit to adjust the system control parameters after the unit receives the operating mode conversion command so that the operating parameters meet the four-way valve commutation conditions, and send control commands to the four-way valve ;

The four-way valve is connected to the main controller and is used for reversing according to the received control instruction;

The main controller is configured to send a cylinder cutting instruction to the drive controller after the four-way valve performs commutation according to the received control instruction;

The drive controller is configured to control the compressor to switch from the single-cylinder operating mode to the double-cylinder operating mode according to the cylinder cutting command.

In a third aspect, an embodiment of the present invention provides an apparatus for controlling cylinder cut of a compressor. The apparatus is used to execute the method of the first aspect. The apparatus includes:

Receiving module, used to receive work mode conversion instructions;

The control module is used to adjust the system control parameters so that the operating parameters meet the four-way valve commutation conditions after receiving the working mode conversion instruction, and to control the four-way valve commutation; also used to control the compressor to switch from the single-cylinder operating mode To dual cylinder operation mode.

According to a fourth aspect, an embodiment of the present invention provides an air conditioning system. The air conditioning system includes the unit described in the second aspect.

Further, the air conditioning system is a variable frequency variable capacity air conditioning system.

Applying the technical solution of the present invention, the operating mode switching instruction is received, and after receiving the operating mode switching instruction, the system control parameters are adjusted so that the operating parameters meet the four-way valve commutation conditions, the four-way valve commutation is controlled, and the compressor is controlled by a single cylinder The operation mode is switched to the two-cylinder operation mode, so the four-way valve commutation is controlled first, and then the cylinder is cut after the four-way valve is commuted, to avoid the system pressure fluctuation caused by the four-way valve commutation after the cylinder is cut. This makes it difficult to maintain the dual-cylinder state. Priority is given to factors that cause the system pressure differential to fluctuate to ensure that the compressor is maintained in a twin-cylinder operating state, the energy efficiency of the unit is guaranteed, and the user experience is improved.

BRIEF DESCRIPTION

FIG. 1 is a flowchart of a method for controlling a cylinder cut of a compressor according to an embodiment of the present invention;

2 is a flowchart of a method for controlling the cylinder cut of a compressor according to an embodiment of the present invention;

FIG. 3 is a flowchart of a method for controlling a cylinder cut of a compressor according to an embodiment of the present invention;

4 is a flowchart of a method for controlling a cylinder cut of a compressor according to an embodiment of the present invention;

5 is a structural block diagram of a unit according to an embodiment of the present invention;

6 is a schematic structural diagram of a unit according to an embodiment of the present invention;

7 is a structural block diagram of an apparatus for controlling cylinder cut of a compressor according to an embodiment of the present invention.

detailed description

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

In the subsequent description, the use of suffixes such as "module", "part" or "unit" used to denote elements is only for the benefit of the present invention, and has no specific meaning in itself. Therefore, "module", "component" or "unit" can be used in a mixed manner.

In order to solve the problem that the four-way valve commutation easily causes the two-cylinder state of the compressor to be difficult to maintain. An embodiment of the present invention provides a method for controlling the cylinder cut of a compressor. As shown in FIG. 1, the method includes:

Step S101: Receive a work mode conversion instruction;

Step S102: After receiving the working mode switching instruction, adjust the system control parameters so that the operating parameters meet the four-way valve commutation conditions, and control the four-way valve commutation;

Step S103: Control the compressor to switch from the single-cylinder operating mode to the double-cylinder operating mode.

Among them, the working mode is cooling mode or heating mode.

In this embodiment, the four-way valve commutation is controlled first, and then the cylinder is cut after the four-way valve commutation, to avoid the system pressure fluctuation caused by the four-way valve commutation after the first cut cylinder makes the two-cylinder state difficult For maintenance, priority is given to factors that make the system pressure differential fluctuate, to ensure that the compressor is maintained in a twin-cylinder operating state, the energy efficiency of the unit is guaranteed, and the user experience is improved.

In a possible implementation, before step S101, before receiving the operation mode switching instruction, the method further includes: starting the unit. Before step S101, there are two cases. The first case is: it is determined that the compressor needs to be switched from the single-cylinder operating mode to the two-cylinder operating mode, which specifically includes: if the current operating frequency of the compressor is greater than the maximum frequency threshold that the compressor can reach when operating in a single cylinder, then determine The compressor needs to be switched from the single-cylinder operating mode to the dual-cylinder operating mode; where the current operating frequency of the compressor is determined according to at least one of the following three factors: the difference between the set temperature value and the ambient temperature value, the setting The size of the fan and the internal capacity of the end of the unit where the compressor is located.

Taking the unit as the air conditioner as an example, the above implementation shows that when the user has high requirements for the cooling or heating capacity of the air conditioner, so that the compressor in the single-cylinder operating mode can no longer meet the user's demand for cooling capacity or heating capacity, then The compressor can be switched to a two-cylinder operating mode to improve the cooling or heating capacity of the air conditioner. In an applicable example, if the ambient temperature value is minus 30 degrees Celsius, and the user needs to turn on the heating mode of the air conditioner, the temperature value set by the remote control is 18 degrees Celsius, then the difference between the set temperature value and the ambient temperature value Larger. If at this time, the user sets the fan gear to a strong gear (indicating that the user has a higher heating requirement for the air conditioner), the operating frequency of the compressor demand can be determined according to the algorithm relationship between the above parameters and the operating frequency of the compressor . And judge whether the frequency has exceeded the maximum frequency threshold that the compressor can withstand in the single cylinder operation mode. If yes, the compressor is controlled to switch from the single-cylinder operating mode to the double-cylinder operating mode to meet the user's experience.

In addition, in the multi-connection system, the increase of the internal unit capacity (for example, after the user turns on the air conditioner in the living room and then turns on the air conditioner in the bedroom) will also increase the requirements for the cooling or heating capacity of the air conditioner. When the user's needs cannot be met, the compressor is controlled to operate in two cylinders.

The second case is: it is determined that the compressor is in the two-cylinder operating mode, and then in step S102, before controlling the four-way valve commutation, the method further includes: controlling the compressor to switch from the two-cylinder operating mode to the single-cylinder operating mode.

It is understandable that, except for the first case, during the operation of the two-cylinder compressor, switching the four-way valve will also cause a sharp fluctuation in the system pressure difference, which may cause the two-cylinder operation state of the compressor to be unsustainable. In an applicable example, after the compressor has been operating in the double-cylinder cooling state for a period of time, there may be a situation where it is necessary to switch to the double-cylinder heating state. In order to avoid the problem that the two-cylinder heating state cannot be maintained stably, you can control the four-way valve to switch forward, control the compressor to switch from the two-cylinder operating mode to the single-cylinder operating mode, and then control the four-way valve to change direction. After the valve is reversed, it is switched to double-cylinder again, that is, the switching process can be expressed as: double-cylinder cooling → single-cylinder cooling → switching four-way valve, single-cylinder heating → double-cylinder heating. As a result, the four-way valve commutation can be completed before switching to the two-cylinder heating state, to ensure that the compressor is maintained in the two-cylinder operating state, the energy efficiency of the unit is guaranteed, and the user experience is improved.

In a possible implementation, the operating parameters are the system pressure difference and the operating frequency of the compressor. As shown in FIG. 2, step S102, adjusting the system control parameters so that the operating parameters satisfy the four-way valve commutation conditions includes:

Step S1021: Increase the operating frequency at a preset speed up to the maximum frequency threshold;

Step S1022. During the increase of the operating frequency at the preset speed, the system control parameters are adjusted so that the system pressure difference and the operating frequency satisfy the four-way valve commutation conditions.

Among them, the four-way valve commutation conditions are: the system pressure difference is greater than or equal to the four-way valve commutation preset pressure difference; and the difference between the operating frequency and the four-way valve commutation preset frequency is less than or equal to the preset difference; where , The operating frequency is less than or equal to the preset frequency of the four-way valve commutation. When the user issues a command to switch the operating mode to the air conditioner via the remote control, the four-way valve will change direction. In the prior art, when there is a demand for dual-cylinder operation, the dual-cylinder operation of the compressor is directly controlled, and if at this time, the operating mode is switched, within a period of time after the four-way valve is switched (for example: 4 or 5 seconds), The high pressure of the system will decrease and the low pressure of the system will increase. The differential pressure of the system is the difference between the high pressure of the system and the low pressure of the system, which will lead to a sharp decrease of the differential pressure of the system. If the four-way valve is switched to the dual-cylinder operating state, the sharp drop in the system pressure difference will make it difficult to maintain the dual-cylinder state of the compressor. If the four-way valve is changed to a single-cylinder running state before the forward compressor, but there is a double-cylinder running demand after the reversing, the system pressure difference at this time obviously cannot meet the double-cylinder running demand. Both of the above situations will affect the user experience. To solve this problem, in the above implementation, after receiving the operation mode conversion instruction, the operating frequency of the compressor is increased at a preset speed up to the maximum frequency threshold; during the increase of the operating frequency of the compressor at a preset speed, detection and judgment Whether the system pressure difference is greater than or equal to the preset pressure difference of the four-way valve commutation; and whether the difference between the operating frequency of the compressor and the preset frequency of the four-way valve commutation is less than or equal to the preset difference (can be 30HZ), use The formula B-30≤f≤B can represent the four-way valve commutation conditions. Among them, B is the preset frequency of the four-way valve commutation, f is the operating frequency, and the preset difference can be 30 Hz. In other words, first control the operating frequency of the compressor and the system pressure difference to meet the reversing conditions of the four-way valve, and then control the four-way valve reversal. It should be noted that at this time, the compressor has not been switched to dual-cylinder operation. After waiting for the four-way valve to change direction, and the system pressure difference remains stable and meets the cylinder cutting conditions, then switch to double cylinder operation. At this time, the compressor can be stably maintained in the dual-cylinder operating state, improving the user's experience. In a possible implementation, the system pressure difference can be made to meet the cylinder-cutting condition by determining whether the system pressure difference is within the preset system pressure difference range after controlling the four-way valve commutation; if not, then Continue to adjust the system control parameters so that the system pressure differential is within the preset system pressure differential interval.

In a possible implementation, as shown in FIG. 3, before step S103, before controlling the compressor to switch from the single-cylinder operating mode to the dual-cylinder operating mode, the method further includes:

Step S104: Provide single-cylinder torque compensation to the compressor.

In a possible implementation, as shown in FIG. 4, after step S103, controlling the compressor to switch from the single-cylinder operating mode to the dual-cylinder operating mode, the method further includes:

Step S105: Provide double-cylinder torque compensation to the compressor.

Taking an air conditioner as an example, in the prior art, when a user is in a low-temperature environment, it is often necessary to turn on the heating mode of the air conditioner, and when the air conditioner has a dual-cylinder operation demand. If the ambient temperature is low and the air conditioner is just started, the system pressure difference will be small and the rise rate will be slow (that is, the system pressure difference will be established slowly), then the system pressure difference will not rise to the first preset system pressure In the difference interval, the compressor cannot actually be in the double-cylinder operation mode, but is operated in the single-cylinder mode, resulting in poor heating effect. At the same time, the drive controller has provided double-cylinder torque compensation for the compressor, resulting in excessive vibration of the compressor body and unbalanced rotation. In severe cases, it will cause damage to the compressor. In this embodiment, after starting the unit, the compressor is first operated in the single-cylinder operation mode, and the system pressure difference is gradually increased by adjusting the system control parameters until it is within the first preset system pressure difference interval. And in this process, the drive controller provides single-cylinder torque compensation for the compressor, which can avoid damage to the compressor due to excessive vibration. When the system pressure difference is within the first preset system pressure difference range, that is, the condition for switching to the dual-cylinder operating mode is met, the compressor is then controlled to switch from the single-cylinder operating mode to the dual-cylinder operating mode, and then the dual-cylinder torque is provided to the compressor Compensation to provide correct and appropriate driving force. Thereby, it is possible to avoid damage to the compressor due to inadequate torque compensation or wrong compensation correspondence.

In a possible implementation, adjusting the system control parameters includes at least one of the following steps:

Reduce the speed of outdoor fans and indoor fans;

Among them, reducing the speed of the outdoor fan and indoor fan includes: controlling the outdoor fan and indoor fan to turn off; reducing the steps of the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve includes: controlling the outdoor unit electronic expansion valve and the indoor unit electronic expansion The valve is closed.

Among them, reducing the speed of the outdoor fan so that the outdoor fan is turned off can prevent the high pressure of the system due to the condenser cooling faster when the outdoor fan is turned on, and reducing the speed of the indoor fan so that the indoor fan is turned off can prevent the fan from being turned on when the indoor fan is turned on The evaporator absorbs heat faster and the system low pressure rises. The system pressure difference is the difference between the system high pressure and the system low pressure. When the system high pressure increases and the system low pressure decreases, it can ensure that the system pressure difference is quickly established. Moreover, the number of steps of the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve is reduced, so that closing the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve will also cause the system pressure difference to increase.

Wherein, the above two steps can be executed alternatively or in parallel, and the invention does not limit this.

And in step S103, after controlling the compressor to switch from the single-cylinder operating mode to the double-cylinder operating mode, the method further includes: controlling the outdoor fan and the indoor fan to return to a normal working state while reducing the rotation speed of the outdoor fan and the indoor fan;

In the case of reducing the number of steps of the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve, the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve are controlled to return to a normal working state.

Among them, the normal working state may be an automatic control state. After the compressor is switched from the single-cylinder operating mode to the double-cylinder operating mode, both the indoor and outdoor electronic expansion valves and the indoor and outdoor fans are restored to the automatic control state. In the automatic control state, the indoor and outdoor electronic expansion valves and indoor and outdoor fans can adjust their own control according to the control information (such as fan gear) sent by the user through the remote control and the operating mode of the air conditioner (cooling or heating mode). The parameters can meet the needs of users while avoiding affecting the normal operation of the air conditioner.

In a possible implementation, in step S103, before controlling the compressor to switch from the single-cylinder operating mode to the dual-cylinder operating mode, the method further includes:

Control the first solenoid valve to be powered off, and the second solenoid valve to be powered on, so that the variable volume port of the compressor is in a low pressure state;

In step S103, after controlling the compressor to switch from the single-cylinder operating mode to the dual-cylinder operating mode, the method further includes: controlling the first solenoid valve to be powered on, and the second solenoid valve to be powered off, so that the variable volume port of the compressor becomes high pressure status.

Among them, the first solenoid valve can make the discharge port of the compressor communicate with the variable volume port, and the discharge port is in a high-pressure state; the second solenoid valve can make the suction port of the compressor communicate with the variable volume port, at the suction port It is in a low-pressure state. Wherein, when the first solenoid valve is powered off, it is determined that the branch where the first solenoid valve is located is in an open state; when the first solenoid valve is powered on, it is determined that the branch where the first solenoid valve is located is in a passage state; when the second solenoid valve is powered off When powered, it is determined that the branch where the second solenoid valve is located is in an open state; when the second solenoid valve is powered on, it is determined that the branch where the second solenoid valve is located is in a passage state.

Whether the compressor is in the single-cylinder state or the double-cylinder state can be controlled by power-on or power-off of the first solenoid valve and the second solenoid valve. It can be understood that the single and double cylinder compressors are not limited to this structure.

5 shows a unit according to an embodiment of the present invention, for performing the method shown in the above embodiment, the unit includes: a main controller 1, a compressor 2, a drive controller 3 of the compressor 2, and a four-way valve 6,

The main controller 1 is used to trigger the unit to adjust the system control parameters after the unit receives the working mode conversion command, so that the operating parameters meet the four-way valve 6 reversal conditions, and send the control command to the four-way valve 6; the four-way valve 6 , Connected to the main controller 1 for commutation according to the received control instruction; the main controller 1 is used to send the switching to the drive controller 3 after the four-way valve 6 performs commutation according to the received control instruction Cylinder command; The drive controller 3 is used to control the compressor 2 to switch from the single-cylinder operating mode to the double-cylinder operating mode according to the cylinder cutting command.

In a possible implementation manner, as shown in FIGS. 5 and 6, the unit further includes: a high-pressure sensor 4 and a low-pressure sensor 5 respectively connected to the compressor 2,

High-pressure sensor 4, used to detect the high pressure of the system;

Low pressure sensor 5, used to detect the low pressure of the system;

The system pressure difference is the difference between the system high pressure and the system low pressure.

In a possible implementation, the main controller 1 is also used to determine that the compressor 2 needs to be switched from the single-cylinder operating mode to the dual-cylinder operating mode before receiving the operation mode switching instruction. If the current operating frequency of the compressor 2 is greater than the maximum frequency threshold that the compressor 2 can reach in the single-cylinder operating mode, it is determined that the compressor 2 needs to be switched from the single-cylinder operating mode to the dual-cylinder operating mode; where, the compressor 2 is currently The required operating frequency is determined according to at least one of the following three factors: the difference between the set temperature value and the ambient temperature value, the set fan gear, and the internal unit capacity at the end of the unit.

In a possible implementation, as shown in FIG. 5 and FIG. 6, the unit further includes: an indoor fan 7 connected to the main controller 1, an outdoor fan 8, and an outdoor unit electronic expansion valve 9 and an indoor unit electronic expansion valve 10. The system control parameters can be adjusted by reducing the rotation speed of the outdoor fan 7 and the indoor fan 8 and / or reducing the number of steps of the outdoor unit electronic expansion valve 9 and the indoor unit electronic expansion valve 10.

Among them, reducing the rotation speed of the outdoor fan 7 and the indoor fan 8 may include: closing the outdoor fan 7 and the indoor fan 8; reducing the number of steps of the outdoor unit electronic expansion valve 9 and the indoor unit electronic expansion valve 10 may include closing the outdoor unit electronic expansion Valve 9 and indoor unit electronic expansion valve 10.

And after controlling the compressor to switch from the single-cylinder operating mode to the double-cylinder operating mode, the outdoor fan 7 and the indoor fan 8 should be controlled to return to the normal working state when the speed of the outdoor fan 7 and the indoor fan 8 decreases. When the steps of the electronic expansion valve 9 and the indoor electronic expansion valve 10 are reduced, the outdoor electronic expansion valve 9 and the indoor electronic expansion valve 10 are controlled to return to the normal working state.

There may be multiple indoor fans 7 and indoor unit electronic expansion valves 10, for example, in a multi-line system, each indoor fan 7 corresponds to one indoor electronic expansion valve 10, respectively. The figure takes an indoor fan 7 and an indoor electronic expansion valve 10 as examples.

In a possible implementation, the drive controller 3 is also used to provide single-cylinder torque compensation to the compressor 2 before controlling the compressor 2 to switch from the single-cylinder operating mode to the dual-cylinder operating mode. After switching from the single-cylinder operating mode to the double-cylinder operating mode, the compressor 2 is provided with double-cylinder torque compensation.

In a possible implementation manner, as shown in FIGS. 5 and 6, the main controller 1 is also used to control the first solenoid valve 11 to be powered off when the single-cylinder operation command is sent to the drive controller 3, and the second The solenoid valve 12 is powered on, so that the variable volume port 13 of the compressor 2 is in a low-pressure state; it is also used to control the first solenoid valve 11 to be powered on and the second solenoid valve 12 off when sending a cylinder cutting command to the drive controller 3 Electricity, so that the variable volume port 13 of the compressor 2 becomes a high-pressure state, wherein the first solenoid valve 11 can make the exhaust port of the compressor 2 communicate with the variable volume port 13, and the exhaust port is in a high-pressure state; the second The solenoid valve 12 can make the suction port of the compressor 2 communicate with the variable volume port 13, and the suction port is in a low-pressure state.

In a possible implementation, the unit further includes a gas-liquid separator 14.

In this way, the four-way valve commutation is controlled first, and then the cylinder is cut after the four-way valve commutation, to avoid the problem that the system pressure fluctuation caused by the four-way valve commutation after the first cylinder cut makes it difficult to maintain the two-cylinder state , Give priority to factors that make the pressure difference of the system fluctuate, to ensure that the compressor is maintained in a double-cylinder operating state, the energy efficiency of the unit is guaranteed, and the user experience is improved.

And when the compressor is running in a single cylinder, it is provided with a suitable single-cylinder torque compensation to avoid damage to the compressor due to excessive vibration.

FIG. 7 shows an apparatus for controlling cylinder cutting of a compressor according to an embodiment of the present invention. The apparatus is used in the method shown in the first embodiment. The apparatus includes:

The receiving module 701 is used to receive a work mode conversion instruction;

The control module 702 is used to adjust the system control parameters so that the operating parameters meet the four-way valve commutation conditions and control the four-way valve commutation after receiving the operating mode conversion instruction; it is also used to control the compressor to switch from the single-cylinder operating mode to Double cylinder operation mode.

In this way, the four-way valve commutation is controlled first, and then the cylinder is cut after the four-way valve commutation, to avoid the problem that the system pressure fluctuation caused by the four-way valve commutation after the first cylinder cut makes it difficult to maintain the two-cylinder state. , Give priority to factors that make the pressure difference of the system fluctuate, to ensure that the compressor is maintained in a double-cylinder operating state, the energy efficiency of the unit is guaranteed, and the user experience is improved.

An embodiment of the present invention also provides an air conditioning system, which includes the units shown in FIGS. 6 and 7.

In a possible implementation, the air conditioning system is a variable frequency variable volume air conditioning system.

It can also be a multi-line system.

It should be noted that in this article, the terms "include", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements It also includes other elements that are not explicitly listed, or include elements inherent to this process, method, article, or device. Without more restrictions, the element defined by the sentence "include one ..." does not exclude that there are other identical elements in the process, method, article or device that includes the element.

The sequence numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods in the above embodiments can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware, but in many cases the former is better Implementation. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence or part that contributes to the existing technology, and the computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, The CD-ROM includes several instructions to enable a mobile terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only schematic, not limiting, and those of ordinary skill in the art Under the inspiration of the invention, many forms can be made without departing from the spirit of the invention and the scope of protection of the claims, all of which fall within the protection of the invention.

Claims

A method for controlling cylinder cutting of a compressor, characterized in that the method includes:

Receive work mode conversion instructions;

After receiving the working mode conversion command, adjust the system control parameters so that the operating parameters meet the four-way valve commutation conditions, and control the four-way valve commutation;

Controlling the compressor to switch from the single-cylinder operating mode to the double-cylinder operating mode.
The method according to claim 1, characterized in that before receiving the operation mode conversion instruction, the method further comprises:

It is determined that the compressor needs to be switched from the single-cylinder operating mode to the double-cylinder operating mode.
The method according to claim 1, characterized in that before receiving the operation mode conversion instruction, the method further comprises:

Determine that the compressor is in a dual-cylinder operating mode;

Before controlling the commutation of the four-way valve, the method further includes:

Controlling the compressor to switch from the double-cylinder operating mode to the single-cylinder operating mode.
The method according to claim 1, wherein after controlling the commutation of the four-way valve, the method further comprises:

Determine whether the system pressure difference is within the preset system pressure difference interval;

If not, continue to adjust the system control parameters so that the system pressure difference is within the preset system pressure difference interval;

Wherein, the preset system pressure differential interval is a system pressure differential interval required for the compressor to maintain the dual-cylinder operating mode.
The method according to claim 2, wherein determining that the compressor needs to be switched from the single-cylinder operating mode to the dual-cylinder operating mode includes:

If the currently required operating frequency of the compressor is greater than the maximum frequency threshold that can be reached in the single-cylinder operating mode of the compressor, it is determined that the compressor needs to be switched from the single-cylinder operating mode to the dual-cylinder operating mode;

Wherein, the current operating frequency of the compressor is determined according to at least one of the following three factors: the difference between the set temperature value and the ambient temperature value, the set fan gear, and the internal unit of the unit where the compressor is located Capacity size.
The method according to claim 1, wherein the operating parameters are a system pressure difference and an operating frequency of the compressor, and adjusting the system control parameters so that the operating parameters satisfy the four-way valve commutation conditions includes:

Increase the operating frequency at a preset speed up to the maximum frequency threshold;

During the increase of the operating frequency at a preset speed, the system control parameters are adjusted so that the system pressure difference and the operating frequency satisfy the four-way valve commutation conditions.
The method of claim 6, wherein:

The four-way valve commutation condition is: the system pressure difference is greater than or equal to the four-way valve commutation preset pressure difference; and the difference between the operating frequency and the four-way valve commutation preset frequency is less than or equal to the preset Difference; wherein, the operating frequency is less than or equal to the preset frequency of the four-way valve commutation.
The method according to claim 1, wherein adjusting the system control parameters includes at least one of the following steps:

Reduce the speed of outdoor fans and indoor fans;

Reduce the number of steps for the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve.
The method of claim 8, wherein:

When adjusting the system control parameters includes reducing the speed of the outdoor fan and the indoor fan, reducing the speed of the outdoor fan and the indoor fan includes: controlling the outdoor fan and the indoor fan to be turned off;

In the case where adjusting the system control parameters includes reducing the steps of the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve, reducing the steps of the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve includes: controlling the outdoor unit electronic expansion valve The expansion valve and the electronic expansion valve of the indoor unit are closed.
The method according to claim 8, wherein after controlling the compressor to switch from the single-cylinder operating mode to the dual-cylinder operating mode, the method further comprises:

In the case of adjusting the system control parameters including reducing the rotational speed of the outdoor fan and the indoor fan, controlling the outdoor fan and the indoor fan to resume normal working conditions;

When adjusting the system control parameters includes reducing the number of steps of the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve, control the outdoor unit electronic expansion valve and the indoor unit electronic expansion valve to return to a normal working state.
The method according to claim 10, characterized in that

The normal working state is an automatic control state.
The method of claim 1, wherein:

Before controlling the compressor to switch from the single-cylinder operating mode to the double-cylinder operating mode, the method further includes:

Single-cylinder torque compensation is provided for the compressor.
The method of claim 1, wherein:

After controlling the compressor to switch from the single-cylinder operating mode to the double-cylinder operating mode, the method further includes:

Double-cylinder torque compensation is provided to the compressor.
The method according to any one of claims 1-13, characterized in that before controlling the compressor to switch from a single-cylinder operating mode to a dual-cylinder operating mode, the method includes:

Control the first solenoid valve to be powered off, and the second solenoid valve to be powered on, so that the variable volume port of the compressor is in a low-pressure state; wherein, the first solenoid valve can make the exhaust port of the compressor and the The variable volume port communicates, and the exhaust port is in a high-pressure state; the second solenoid valve enables the suction port of the compressor to communicate with the variable volume port, and the suction port is in a low-pressure state.
The method according to any one of claims 1-13, wherein controlling the compressor to switch from a single-cylinder operating mode to a dual-cylinder operating mode includes:

Controlling the first solenoid valve to be powered on, and the second solenoid valve to be powered off, so that the variable volume port of the compressor is in a high-pressure state, wherein the first solenoid valve can make the exhaust port of the compressor and the The variable volume port communicates, and the exhaust port is in a high-pressure state; the second solenoid valve enables the suction port of the compressor to communicate with the variable volume port, and the suction port is in a low-pressure state.
The method according to any one of claims 1-13, characterized in that

The working mode includes a cooling mode or a heating mode.
A unit, characterized in that the unit is used to execute the method described in any one of claims 1 to 16, and the unit includes: a main controller, a compressor, a drive controller of the compressor, and four Port valve,

The main controller is used to trigger the unit to adjust the system control parameters after the unit receives the operating mode conversion command so that the operating parameters meet the four-way valve commutation conditions, and send control commands to the four-way valve ;

The four-way valve is connected to the main controller and is used for reversing according to the received control instruction;

The main controller is configured to send a cylinder cutting instruction to the drive controller after the four-way valve performs commutation according to the received control instruction;

The drive controller is configured to control the compressor to switch from the single-cylinder operating mode to the double-cylinder operating mode according to the cylinder cutting command.
A device for controlling cylinder cutting of a compressor, characterized in that the device is used to execute the method described in any one of claims 1 to 16, and the device includes:

Receiving module, used to receive work mode conversion instructions;

The control module is used to adjust the system control parameters so that the operating parameters meet the four-way valve commutation conditions after receiving the working mode conversion instruction, and to control the four-way valve commutation; also used to control the compressor to switch from the single-cylinder operating mode To dual cylinder operation mode.
An air-conditioning system, characterized in that the air-conditioning system includes the unit described in claim 17.
The system according to claim 19, characterized in that

The air conditioning system is a variable frequency variable capacity air conditioning system.
A computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, when the processor executes the program, any one of claims 1 to 16 is implemented The method for controlling the cylinder cut of the compressor.
A storage medium containing computer-executable instructions, which when executed by a computer processor, is used to execute the method for controlling the cylinder cut of a compressor according to any one of claims 1 to 16.