Variable displacement swash plate type compressor control method and variable displacement swash plate type compressor controlled by the same

Abstract

The present invention relates to a variable capacity swash plate type compressor control method and a variable capacity swash plate type compressor controlled by the method, comprising: a first determining step of determining the possibility of the presence of liquid refrigerant inside the compressor at the start of the compressor; a first operating step of applying power to the field coil assembly and not applying current to the electronic control valve in the case where it is determined that the possibility of the presence of liquid refrigerant is high; a second determining step of comparing the elapsed time since the operation of the above first operating step with a reference time determined in advance; and a second operating step of maintaining the power applied to the field coil assembly in the above first operating step and applying current to the electronic control valve in the case where it is determined that the above elapsed time is greater than or equal to the above reference time.

Description

Technical Field

[0001] This invention relates to a control method for a variable capacity swashplate compressor and a variable capacity swashplate compressor controlled by the method, and more specifically, to a control method for a variable capacity swashplate compressor capable of reducing noise and vibration generated by liquid refrigerant and a variable capacity swashplate compressor controlled by the method. Background Technology

[0002] Typically, automobiles are equipped with air conditioning (A / C) systems for cooling and heating the interior. In such air conditioning systems, the refrigeration system includes a compressor that compresses a low-temperature, low-pressure gaseous refrigerant introduced from the evaporator into a high-temperature, high-pressure gaseous refrigerant, which is then delivered to the condenser.

[0003] The aforementioned compressors include reciprocating compressors that compress refrigerant through the reciprocating motion of pistons and rotary compressors that perform compression through rotational motion. The reciprocating compressors include crank-type compressors that transmit power to multiple pistons using a crank, and swashplate-type compressors that transmit power to a rotating shaft equipped with swashplates, depending on the power transmission method. The rotary compressors include vane rotor compressors that use a rotating rotor shaft and blades, and screw compressors that use a helical screw and a fixed screw.

[0004] Here, a swashplate compressor is a compressor that compresses refrigerant by having the piston reciprocate along a swashplate that rotates together with the rotating shaft. Recently, in order to improve the performance and efficiency of the compressor, it has been configured as a so-called variable capacity type, in which the piston stroke is adjusted by adjusting the tilt angle of the swashplate, thereby adjusting the amount of refrigerant discharged.

[0005] Specifically, existing variable capacity swashplate compressors include: a housing; a rotating shaft rotatably supported on the housing; a disk disposed outside the housing and rotating together with the rotating shaft; a pulley that rotates by receiving power from a drive source (e.g., an engine); a field coil assembly that is magnetized by an applied power source and brings the disk into contact with the pulley; an elastic member that separates the disk from the pulley when the field coil assembly is not powered; a swashplate disposed in the crank chamber of the housing and rotating together with the rotating shaft; a piston disposed in the main body of the housing and reciprocating by means of the swashplate; a valve mechanism that connects and blocks the compression chamber formed by the main body and the piston with the suction chamber and discharge chamber of the housing; and a tilt adjustment mechanism that adjusts the tilt angle of the swashplate relative to the rotating shaft (the angle between the normal to the center of rotation of the swashplate and the rotating shaft).

[0006] Here, the tilt adjustment mechanism includes an inflow path that guides the refrigerant from the discharge chamber to the crank chamber and an outflow path that guides the refrigerant from the crank chamber to the suction chamber. The inflow path is provided with an electronic control valve (ECV) that regulates the amount of refrigerant flowing from the discharge chamber into the inflow path. The outflow path is provided with an orifice hole that reduces the pressure of the fluid passing through the outflow path to the suction pressure level to prevent the pressure in the suction chamber from increasing.

[0007] The aforementioned variable capacity swashplate compressor operates as follows.

[0008] That is, when the user starts the vehicle, the pulleys receive power from the drive source and rotate.

[0009] In this state, if the user starts the air conditioning unit, power is applied to the above-mentioned field coil assembly, and current is applied to the above-mentioned electronic control valve.

[0010] In this way, when power is applied to the aforementioned field coil assembly, the disk comes into contact with the aforementioned pulley due to the attraction caused by magnetic induction. That is, the disk and the aforementioned pulley engage. The rotating shaft receives power from the drive source and rotates via the aforementioned pulley and the aforementioned disk, while the inclined plate rotates together with the rotating shaft. Furthermore, the piston converts the rotational motion of the inclined plate into linear motion, reciprocating within the main body. Moreover, when the piston moves from top dead center to bottom dead center, the compression chamber communicates with the intake chamber via the aforementioned valve mechanism and is blocked from the aforementioned discharge chamber, allowing refrigerant in the intake chamber to be drawn into the compression chamber. Furthermore, when the piston moves from bottom dead center to top dead center, the compression chamber is blocked from both the intake and discharge chambers via the aforementioned valve mechanism, compressing the refrigerant in the compression chamber. Moreover, when the piston reaches top dead center, the compression chamber is blocked from the intake chamber via the aforementioned valve mechanism and communicates with the aforementioned discharge chamber, allowing the refrigerant compressed in the compression chamber to be discharged into the discharge chamber.

[0011] Furthermore, as current is applied to the aforementioned electronic control valve, the amount of refrigerant flowing from the discharge chamber into the inflow path is regulated by the aforementioned electronic control valve, thereby regulating the pressure in the crank chamber, the stroke of the piston, the tilt angle of the swashplate, and the refrigerant discharge rate.

[0012] On the other hand, when the user stops the vehicle or turns off the air conditioning unit, the power supply to the aforementioned field coil assembly and the current supply to the aforementioned electronic control valve are stopped. As a result, the attraction generated by the magnetic induction of the aforementioned field coil assembly does not occur, and the disc disengages from the aforementioned pulley by means of the elastic force of the aforementioned elastic member. That is, the connection between the disc and the aforementioned pulley is released. Thus, the power transmission from the aforementioned drive source to the aforementioned rotating shaft is interrupted, and refrigerant compression is interrupted.

[0013] However, in existing variable capacity swashplate compressors and the control methods for controlling such compressors, when the variable capacity swashplate compressor is started in the presence of liquid refrigerant, the liquid refrigerant is compressed, the load increases, and there are problems of increased noise and vibration. Summary of the Invention

[0014] Technical issues

[0015] The purpose of this invention is to provide a control method for a variable capacity swashplate compressor that can reduce noise and vibration caused by liquid refrigerant, and a variable capacity swashplate compressor controlled by the method.

[0016] Technical solution

[0017] To achieve the aforementioned objective, the present invention provides a control method for a variable capacity swashplate compressor, the variable capacity swashplate compressor comprising: a housing; a rotating shaft rotatably supported on the housing; a disc and a swashplate rotating together with the rotating shaft; a pulley rotating upon receiving power from a drive source; a field coil assembly connecting the disc and the pulley when power is applied; a piston reciprocating via the swashplate; and an electronic control valve adjusting the tilt angle of the swashplate relative to the rotating shaft when current is applied. When the variable capacity swashplate compressor is started, the method includes: a first determination step, determining whether the variable capacity swashplate compressor is in operation. The possibility of liquid refrigerant inside the capacity swashplate compressor; First operating step: if the possibility of liquid refrigerant being present is high in the first determination step, power is applied to the field coil assembly but no current is applied to the electronic control valve; Second determination step: the elapsed time of the first operating step is compared with a predetermined reference time; and Second operating step: if the elapsed time is determined to be greater than or equal to the reference time in the second determination step, the power applied to the field coil assembly in the first operating step is maintained, and current is applied to the electronic control valve.

[0018] If, in the first judgment step above, it is determined that the possibility of the presence of liquid refrigerant is low, in the second operation step above, power is applied to the field coil assembly above, and current is applied to the electronic control valve above.

[0019] The first judgment step mentioned above includes a low-temperature judgment step to determine whether the variable capacity swashplate compressor is in a low-temperature state.

[0020] In the above-mentioned low temperature determination step, if the coolant temperature of the vehicle equipped with the above-mentioned variable capacity swashplate compressor is below a predetermined reference temperature, it is determined that the above-mentioned variable capacity swashplate compressor is in a low temperature state.

[0021] The aforementioned reference temperature is set to 50 degrees Celsius.

[0022] The first judgment step mentioned above also includes a long-term idleness judgment step to determine whether the variable capacity swashplate compressor has been idle for a long period of time.

[0023] In the above-mentioned long-term idleness determination step, when the information acquisition of the heater controller controlling the above-mentioned variable capacity swashplate compressor is in a stopped state, it is determined that the above-mentioned variable capacity swashplate compressor is idle for a long period of time.

[0024] In the above-mentioned low temperature determination step, it is determined that the variable capacity swashplate compressor is in a low temperature state. In the above-mentioned long-term idleness determination step, it is determined that the variable capacity swashplate compressor has been idle for a long time, and it is determined that there is a high probability that liquid refrigerant is present.

[0025] If, in the above-mentioned low temperature determination step, it is determined that the variable capacity swashplate compressor is not in a low temperature state, or, in the above-mentioned long-term idleness determination step, it is determined that the variable capacity swashplate compressor has not been idle for a long time, then it is determined that the possibility of liquid refrigerant is low.

[0026] In the first operating step described above, the variable capacity swashplate compressor starts driving from the state where the tilt angle of the swashplate is at its minimum.

[0027] The minimum value mentioned above is set to be greater than zero (0).

[0028] The minimum value is set to be in the range of 0.5 degrees or higher and 0.7 degrees or lower.

[0029] If, in the second judgment step above, it is determined that the elapsed time is less than the reference time, the process returns to the first running step above.

[0030] The aforementioned reference time is set to any value between 3 and 5 seconds.

[0031] Furthermore, the present invention provides a variable capacity swashplate compressor controlled by the above-described variable capacity swashplate compressor control method.

[0032] Invention Effects

[0033] The variable capacity swashplate compressor control method based on the present invention includes the following steps when the variable capacity swashplate compressor starts: a first determination step, determining the possibility that liquid refrigerant is present inside the variable capacity swashplate compressor; a first operation step, in which, if the possibility of liquid refrigerant presence is high in the first determination step, power is applied to the field coil assembly but no current is applied to the electronic control valve; a second determination step, comparing the elapsed time of the operation in the first operation step with a predetermined reference time; and a second operation step, in which, if the elapsed time is determined to be greater than or equal to the reference time in the second determination step, the power applied to the field coil assembly in the first operation step is maintained, and current is applied to the electronic control valve. The variable capacity swashplate compressor based on the present invention, controlled by the above method, can reduce noise and vibration caused by liquid refrigerant during startup when the variable capacity swashplate compressor is in the presence of liquid refrigerant. Attached Figure Description

[0034] Figure 1 This is a perspective view showing a variable capacity swashplate compressor based on an embodiment of the present invention.

[0035] Figure 2 This is a timing diagram illustrating a control method for a variable capacity swashplate compressor based on an embodiment of the present invention.

[0036] Figure 3 Through Figure 2 Variable capacity swashplate compressor control method Figure 1 In the case of a variable capacity swashplate compressor, a diagram showing the opening and closing times of the field coil assembly and the electronic control valve. Detailed Implementation

[0037] The following detailed description, with reference to the accompanying drawings, describes the control method for a variable capacity swashplate compressor based on the present invention, and the variable capacity swashplate compressor controlled by the method.

[0038] Figure 1 This is a perspective view showing a variable capacity swashplate compressor based on an embodiment of the present invention. Figure 2 This is a timing diagram illustrating a control method for a variable capacity swashplate compressor based on an embodiment of the present invention. Figure 3 Through Figure 2 Variable capacity swashplate compressor control method Figure 1 In the case of a variable capacity swashplate compressor, a diagram showing the on-off timing of the field coil assembly and the electronic control valve.

[0039] Reference Figure 1A variable capacity swashplate compressor according to an embodiment of the present invention includes: a housing 100; a rotating shaft 200 rotatably supported on the housing 100; a disc 300 disposed outside the housing 100 and rotating together with the rotating shaft 200; a pulley 400 rotating upon receiving power from a drive source (e.g., an engine); and a field coil assembly magnetized when powered, bringing the disc 300 into contact with the pulley 400. Coils 500; an elastic member 600 that separates the disc 300 from the pulley 400 when no power is applied to the field coil assembly 500; a crank chamber V4 provided in the housing 100; a swashplate 700 that rotates together with the rotating shaft 200; a piston 800 that is provided in the main body 110 of the housing 100 and reciprocates by means of the swashplate 700; a valve mechanism 900 that connects and blocks the compression chamber formed by the main body 110 and the piston 800 with the intake chamber V1 and the discharge chamber V3 of the housing 100; and a tilt adjustment mechanism that adjusts the tilt angle of the swashplate 700 relative to the rotating shaft 200 (the angle between the normal from the center of rotation of the swashplate 700 and the rotating shaft 200).

[0040] Here, the tilt adjustment mechanism may include an inflow path (not shown) that guides the refrigerant from the discharge chamber V3 to the crank chamber V4 and an outflow path (not shown) that guides the refrigerant from the crank chamber V4 to the intake chamber V1.

[0041] Furthermore, an electronic control valve (ECV) for regulating the amount of refrigerant flowing from the discharge chamber V3 into the aforementioned inflow path (not shown) can be formed in the aforementioned inflow path (not shown).

[0042] Furthermore, a throttling orifice can be formed in the aforementioned discharge flow path (not shown) to reduce the pressure of the fluid passing through the aforementioned discharge flow path (not shown) to the suction pressure level, thereby preventing an increase in the pressure of the aforementioned suction chamber V1.

[0043] The variable capacity swashplate compressor described above can operate in the following manner.

[0044] That is, when the user starts the vehicle, the pulley 400 can receive power from the drive source and rotate.

[0045] In this state, when the user starts the air conditioning unit, power can be applied to the aforementioned field coil assembly 500, and current can be applied to the aforementioned electronic control valve (ECV). Here, as... Figure 3 As shown, even if power is applied to the above-mentioned field coil assembly 500, it is possible that no current is applied to the above-mentioned electronic control valve (ECV), which will be described later.

[0046] Next, if power is applied to the aforementioned field coil assembly 500, the disk 300 can contact the pulley 400 through the magnetic induction-generated suction force. That is, the disk 300 can be engaged with the pulley 400. In this way, the rotating shaft 200 receives power transmission from the drive source and rotates via the pulley 400 and the disk 300, and the inclined plate 700 can rotate together with the rotating shaft 200. Moreover, the piston 800 converts the rotational motion of the inclined plate 700 into linear motion, enabling it to reciprocate within the main body 110. Furthermore, when the piston 800 moves from the top dead center to the bottom dead center, the compression chamber is connected to the suction chamber V1 and blocked from the discharge chamber V3 by means of the valve mechanism 900, allowing the refrigerant in the suction chamber V1 to be drawn into the compression chamber. Furthermore, when the piston 800 moves from bottom dead center to top dead center, the compression chamber is blocked from the intake chamber V1 and the discharge chamber V3 by means of the valve mechanism 900, thereby compressing the refrigerant in the compression chamber. Moreover, when the piston 800 reaches top dead center, the compression chamber is blocked from the intake chamber V1 and connected to the discharge chamber V3 by means of the valve mechanism 900, thereby discharging the refrigerant compressed in the compression chamber into the discharge chamber V3.

[0047] Furthermore, if current is applied to the aforementioned electronic control valve (ECV), the amount of refrigerant flowing from the discharge chamber V3 into the inflow path (not shown) is regulated by means of the aforementioned electronic control valve (ECV), thereby regulating the pressure of the crank chamber V4, the stroke of the piston 800, the tilt angle of the swashplate 700, and the refrigerant discharge amount can be regulated.

[0048] Specifically, when the sum of the torque generated by the pressure of the crank chamber V4 on the swash plate 700 and the torque generated by the return spring on the swash plate 700 (hereinafter referred to as the first torque) is greater than the torque generated by the compression reaction force of the piston 800 (hereinafter referred to as the second torque), the tilt angle of the swash plate 700 decreases; conversely, the tilt angle of the swash plate 700 increases.

[0049] However, if the amount of refrigerant flowing from the discharge chamber V3 into the inflow path (not shown) is increased by means of the electronic control valve (ECV), the amount of refrigerant flowing into the crank chamber V4 through the inflow path (not shown) also increases, the pressure in the crank chamber V4 increases, and the first torque increases.

[0050] Here, the refrigerant in the crank chamber V4 is discharged into the intake chamber V1 through the discharge path (not shown). However, if the amount of refrigerant discharged from the discharge chamber V3 into the intake chamber V1 through the inflow path (not shown) is greater than the amount of refrigerant discharged from the crank chamber V4 into the intake chamber V1 through the discharge path (not shown), the pressure in the crank chamber V4 increases.

[0051] Furthermore, when the first torque is greater than the second torque, the tilt angle of the inclined plate 700 decreases, the stroke of the piston 800 decreases, and the amount of refrigerant discharged decreases.

[0052] Conversely, the amount of refrigerant flowing from the discharge chamber V3 into the inflow path (not shown) is reduced by means of the electronic control valve (ECV). As the amount of refrigerant flowing into the crank chamber V4 through the inflow path (not shown) decreases, the pressure in the crank chamber V4 decreases, and the first torque decreases.

[0053] Here, even if the refrigerant in the discharge chamber V3 flows into the crank chamber V4 through the inflow path (not shown), if the amount of refrigerant discharged from the crank chamber V4 into the suction chamber V1 through the discharge path (not shown) is greater than the amount of refrigerant flowing from the discharge chamber V3 into the crank chamber V4 through the inflow path (not shown), the pressure in the crank chamber V4 decreases.

[0054] Furthermore, when the first torque is less than the second torque, the tilt angle of the inclined plate 700 increases, the stroke of the piston 800 increases, and the amount of refrigerant discharged can increase.

[0055] On the other hand, when the first torque and the second torque are the same, the tilt angle of the inclined plate 700 is maintained in a steady state, and the stroke of the piston 800 and the amount of refrigerant discharged remain constant.

[0056] Here, the compression reaction force of the piston 800 is proportional to the amount of compression, so the compression reaction force of the piston 800 and the second torque increase as the tilt angle of the swashplate 700 increases. Consequently, the greater the tilt angle of the swashplate 700, the greater the pressure in the crank chamber V4 used to maintain the tilt angle of the swashplate 700. That is, the pressure in the crank chamber V4 when the tilt angle of the swashplate 700 is maintained from a relatively large state to a normal state is greater than the pressure in the crank chamber V4 when the tilt angle of the swashplate 700 is maintained from a relatively small state to a normal state.

[0057] On the other hand, when the user stops the vehicle or turns off the air conditioning unit, the power supply to the aforementioned field coil assembly 500 and the current supply to the aforementioned electronic control valve (ECV) also cease. In this way, the attraction generated by the magnetic induction of the aforementioned field coil assembly 500 does not occur, and by means of the elastic force of the aforementioned elastic member 600, the aforementioned disc 300 disengages from the aforementioned pulley 400; that is, the connection between the aforementioned disc 300 and the aforementioned pulley 400 is released. Thus, the power transmission from the aforementioned drive source to the aforementioned rotating shaft 200 is interrupted, and refrigerant compression is interrupted.

[0058] Here, the variable capacity swashplate compressor based on this embodiment can be made by Figure 2 The variable capacity swashplate compressor control method shown is used for control.

[0059] Reference Figure 2 According to an embodiment of the present invention, the variable capacity swashplate compressor control method includes a first determination step (S1) when the variable capacity swashplate compressor is started, which determines the possibility that liquid refrigerant exists inside the variable capacity swashplate compressor.

[0060] Here, based on the analysis result that there is a high probability of liquid refrigerant inside the variable capacity swashplate compressor when it is kept at a low temperature for a long time, the first judgment step (S1) further includes a low temperature judgment step (S11) to judge whether the variable capacity swashplate compressor is in a low temperature state and a long-term idle judgment step (S12) to judge whether the variable capacity swashplate compressor is idle for a long time.

[0061] In the above-mentioned low temperature determination step (S11), if the coolant temperature Tw of the vehicle equipped with the above-mentioned variable capacity swash plate compressor is below a predetermined reference temperature T0 (e.g., 50 degrees Celsius), it is determined that the above-mentioned variable capacity swash plate compressor is in a low temperature state.

[0062] In the above-mentioned long-term idleness determination step (S12), the heater controller that controls the variable capacity swashplate compressor acquires information about one hour after the variable capacity swashplate compressor stops, and then stops acquiring information. Considering this, when the information acquisition of the heater controller is in a stopped state, it is determined that the variable capacity swashplate compressor is idle for a long period of time.

[0063] Furthermore, in the first judgment step (S1) above, if it is determined in the above low temperature judgment step (S11) that the above variable capacity swashplate compressor is in a low temperature state, and in the above long-term idleness judgment step (S12) that the above variable capacity swashplate compressor is idle for a long time, it is determined that there is a high probability that liquid refrigerant is present.

[0064] Furthermore, in the first judgment step (S1) above, if it is determined in the above low temperature judgment step (S11) that the above variable capacity swashplate compressor is not in a low temperature state, or in the above long-term idleness judgment step (S12) that the above variable capacity swashplate compressor has not been idle for a long time, it is determined that the possibility of liquid refrigerant is low.

[0065] In this embodiment, the above-mentioned low temperature determination step (S11) may be executed before the above-mentioned long-term idleness determination step (S12), or the above-mentioned long-term idleness determination step (S12) may be executed before the above-mentioned low temperature determination step (S11).

[0066] Next, the above-mentioned variable capacity swashplate compressor control method further includes a first operating step (S2), in which, if it is determined in the first judgment step (S1) that there is a high probability of the presence of liquid refrigerant, in the first operating step (S2), power is applied to the field coil assembly 500, and no current is applied to the electronic control valve (ECV).

[0067] Here, when the variable capacity swashplate compressor is driven in the first operating step (S2) described above, the operation starts from the state where the tilt angle of the swashplate 700 is at its minimum value, forming a small pumping. The tilt angle of the swashplate 700 is increased to some extent by means of the compression reaction force, or is maintained at the minimum value level. At this time, in order to compress and discharge the refrigerant at a low flow rate, the minimum value is preferably greater than zero (0) (included in the range of 0.5 degrees or more and 0.7 degrees or less).

[0068] Furthermore, the above-mentioned variable capacity swashplate compressor control method also includes a second judgment step (S3). In the second judgment step (S3), the elapsed time t of the operation in the first operation step (S2) is compared with a predetermined reference time t0 (for example, any value between 3 seconds and 5 seconds). If the second judgment step (S3) determines that the elapsed time t is greater than or equal to the reference time t0, the second operation step (S4) described later is executed. If the second judgment step (S3) determines that the elapsed time t is less than the reference time t0, the process returns to the first operation step (S2).

[0069] Furthermore, the above-mentioned variable capacity swashplate compressor control method also includes a second operating step (S4). In the second operating step (S4), if it is determined in the second judgment step (S3) that the elapsed time t is greater than or equal to the reference time t0, the power supply applied to the field coil assembly 500 in the first operating step (S2) is maintained, and the current is applied to the electronic control valve (ECV). Moreover, if it is determined in the first judgment step (S1) that the possibility of liquid refrigerant is low, the power supply is applied to the field coil assembly 500 and the current is applied to the electronic control valve (ECV).

[0070] Here, the variable capacity swashplate compressor based on this embodiment is controlled by the above-described variable capacity swashplate compressor control method, thereby reducing noise and vibration caused by liquid refrigerant.

[0071] Specifically, refer to Figure 2 and Figure 3 When the variable-capacity swashplate compressor is started under conditions where there is a high probability of liquid refrigerant presence, if the first determination step (S1) determines that there is a high probability of liquid refrigerant presence, then in the first operating step (S2), power is applied only to the field coil assembly 500, and no current is applied to the electronic control valve (ECV). As a result, the variable-capacity swashplate compressor is driven at the minimum tilt angle of the swashplate 700, enabling the refrigerant to be compressed and discharged at a low flow rate. Thus, the liquid refrigerant present inside the variable-capacity swashplate compressor can be discharged to the outside without increased noise or vibration. Furthermore, this state continues until the transition to the second operating step (S4) is achieved via the second determination step (S3). That is, after the first operating step (S2) continues for the aforementioned reference time (t0), the process transitions to the second operating step (S4), where power is applied to the field coil assembly 500 and current is applied to the electronic control valve (ECV) as in the first operating step (S2). Therefore, the aforementioned variable capacity swashplate compressor can operate normally even without liquid refrigerant.

[0072] On the other hand, when the variable capacity swashplate compressor is started under conditions where the possibility of liquid refrigerant is low, if the first determination step (S1) determines that the possibility of liquid refrigerant is low, the second operation step (S4) can be immediately initiated, in which power is applied to the field coil assembly 500 and current is applied to the electronic control valve (ECV). That is, the variable capacity swashplate compressor can be driven normally immediately.

[0073] As a result, the liquid refrigerant is discharged with minimal noise and vibration, allowing for normal operation from a state without liquid refrigerant, thus reducing noise and vibration caused by the liquid refrigerant.

Claims

1. A control method for a variable capacity swashplate compressor, wherein the variable capacity swashplate compressor comprises: shell; A rotating shaft rotatably supported on the housing; The disk and inclined plate rotate together with the rotating axis; A pulley that rotates by receiving power from a drive source; a field coil assembly that connects the disk and the pulley when power is applied; a piston that reciprocates by means of the inclined plate; And an electronic control valve that adjusts the tilt angle of the swashplate relative to the rotating shaft when an electric current is applied, including, when the variable capacity swashplate compressor starts: The first judgment step is to determine the possibility that liquid refrigerant exists inside the variable capacity swash plate compressor. In the first operating step, if it is determined in the first judgment step that the possibility of liquid refrigerant is high, power is applied to the field coil assembly but no current is applied to the electronic control valve. The second judgment step compares the elapsed time of the operation in the first running step with a predetermined reference time; and In the second operating step, if it is determined in the second judgment step that the elapsed time is greater than or equal to the reference time, the power supply applied to the field coil assembly in the first operating step is maintained, and current is applied to the electronic control valve. In the first operating step, the variable capacity swashplate compressor starts to operate from the state where the tilt angle of the swashplate is at its minimum, so that the liquid refrigerant present in the variable capacity swashplate compressor is discharged to the outside at a low flow rate.

2. The variable capacity swashplate compressor control method according to claim 1, wherein, If, in the first determination step, it is determined that the possibility of the presence of liquid refrigerant is low, in the second operation step, power is applied to the field coil assembly and current is applied to the electronic control valve.

3. The variable capacity swashplate compressor control method according to claim 1, wherein, The first judgment step includes a low-temperature judgment step to determine whether the variable capacity swashplate compressor is in a low-temperature state.

4. The variable capacity swashplate compressor control method according to claim 3, wherein, In the low temperature determination step, if the coolant temperature of the vehicle equipped with the variable capacity swashplate compressor is below a predetermined reference temperature, the variable capacity swashplate compressor is determined to be in a low temperature state.

5. The variable capacity swashplate compressor control method according to claim 4, wherein, The reference temperature is set to 50 degrees Celsius.

6. The variable capacity swashplate compressor control method according to claim 3, wherein, The first judgment step also includes a long-term idleness judgment step to determine whether the variable capacity swashplate compressor has been idle for a long time.

7. The variable capacity swashplate compressor control method according to claim 6, wherein, In the step of determining whether the variable capacity swashplate compressor is idle for a long period of time, if the information acquisition of the heater controller controlling the variable capacity swashplate compressor is in a stopped state, it is determined that the variable capacity swashplate compressor is idle for a long period of time.

8. The variable capacity swashplate compressor control method according to claim 6, wherein, In the step of determining whether the temperature is low, it is determined that the variable capacity swashplate compressor is in a low temperature state. In the step of determining whether the compressor is idle for a long time, it is determined that the variable capacity swashplate compressor is idle for a long time, and it is determined that there is a high probability that liquid refrigerant is present.

9. The variable capacity swashplate compressor control method according to claim 6, wherein, If, in the step of determining whether the temperature is low, it is determined that the variable capacity swashplate compressor is not in a low temperature state, or, in the step of determining whether the compressor has been idle for a long time, it is determined that the possibility of liquid refrigerant is low.

10. The control method for a variable capacity swashplate compressor according to claim 1, wherein, The minimum value is set to be greater than zero.

11. The variable capacity swashplate compressor control method according to claim 10, wherein, The minimum value is set to be included in the range of 0.5 degrees or higher and 0.7 degrees or lower.

12. The variable capacity swashplate compressor control method according to claim 1, wherein, If, in the second determination step, it is determined that the elapsed time is less than the reference time, the process returns to the first running step.

13. The variable capacity swashplate compressor control method according to claim 1, wherein, The reference time is set to any value between 3 and 5 seconds.

14. A variable capacity swashplate compressor, controlled by the variable capacity swashplate compressor control method according to any one of claims 1 to 13.

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