Air conditioner

Abstract

The application discloses an air conditioner, which comprises: a refrigerant circuit, which circulates refrigeration in sequence through a variable frequency compressor, an outdoor heat exchanger, an expansion valve and an indoor heat exchanger; an outdoor fan, which is used for changing the suction speed of outdoor air by adjusting the rotating speed of the outdoor fan; a temperature sensor, which is arranged on the outdoor heat exchanger and is used for detecting the outdoor environment temperature; and a controller, which is connected with the temperature sensor and the outdoor fan, and is configured to: acquire the outdoor environment temperature and the actual operation information of the outdoor fan; determine the initial target current of the outdoor fan according to the outdoor environment temperature and the actual operation information; determine the target current limit value of the outdoor fan according to the actual operation information; and determine the final target current of the outdoor fan according to the initial target current and the target current limit value. The air conditioner can dynamically adjust the target current limit value through the actual operation information of the outdoor fan, so that the problem of thermal damage of the outdoor fan can be completely avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to an air conditioner. BACKGROUND

[0002] In the related art, the existing air conditioner limits the target current of the indoor fan through a fixed target current limit value. However, the actual situation of each outdoor fan is different. If the target current limit value is too large, it cannot adapt to the outdoor fan, so that when the current of the outdoor fan is limited at a high target current limit value, the problem of thermal damage of the outdoor fan cannot be completely avoided. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide an air conditioner, which can dynamically adjust the target current limit value through the actual running information of the outdoor fan, so that the target current limit value can adapt to various outdoor fans, thereby completely avoiding the problem of thermal damage of the outdoor fan.

[0004] In order to solve the above problems, the first aspect of the present application provides an air conditioner, comprising: a refrigerant circuit, which circulates refrigeration through a variable frequency compressor, an outdoor heat exchanger, an expansion valve and an indoor heat exchanger in sequence; an outdoor fan, which is used to change the suction speed of outdoor air by adjusting the rotating speed of the outdoor fan; a temperature sensor, which is arranged at the outdoor heat exchanger and is used to detect the outdoor environment temperature; a controller, which is connected with the temperature sensor and the outdoor fan, and is configured to: acquire the outdoor environment temperature and the actual running information of the outdoor fan; determine the initial target current of the outdoor fan according to the outdoor environment temperature and the actual running information; determine the target current limit value of the outdoor fan according to the actual running information; and determine the final target current of the outdoor fan according to the initial target current and the target current limit value.

[0005] According to the air conditioner of the present application, the target current limit value is dynamically adjusted according to the actual running information of the outdoor fan, that is, the target current limit value is adaptively adjusted according to the installation situation, structural configuration and actual running situation of the outdoor fan, so that the initial target current of the outdoor fan can be limited through the dynamically adjusted target current limit value, so that the air conditioner can better improve the heat exchange effect, and avoid the problem of thermal damage of the outdoor fan caused by the increase of current. Therefore, compared with the existing air conditioner which limits the target current of the indoor fan through a fixed target current limit value, the target current limit value in the present application is dynamically adjusted through the actual running information of the outdoor fan, so that the target current limit value can adapt to various outdoor fans, thereby completely avoiding the problem of thermal damage of the outdoor fan.

[0006] In some embodiments, the actual operation information includes an actual operation current, an actual rotation speed value, and an actual operation temperature, and for determining the target current limit value of the outdoor fan according to the actual operation information, the controller is specifically configured to: determine the target current limit value according to the actual operation current and the actual rotation speed value; or determine the target current limit value according to the actual operation current and the actual operation temperature; or determine the target current limit value according to the actual operation current, the actual rotation speed value, and the actual operation temperature.

[0007] The technical solution has the following advantages or beneficial effects: the target current limit value is dynamically adjusted according to the actual operation current, the actual rotation speed value, and the actual operation temperature, so that the operation current of the outdoor fan is limited by the target current limit value before the current of the outdoor fan excessively increases due to site installation restrictions, import and export configurations, or marginal utility sharp reduction, thereby avoiding the problem of thermal damage of the outdoor fan winding, and at the same time, the actual operation current is dynamically adjusted to adjust the target current limit value when the temperature of the outdoor fan is about to be abnormal, so that the operation current of the outdoor fan is limited by the target current limit value, thereby avoiding the problem of thermal damage of the outdoor fan due to the increase of the current.

[0008] In some embodiments, for determining the target current limit value according to the actual operation current and the actual rotation speed value, the controller is specifically configured to: perform differential calculation according to the actual operation current and the actual rotation speed value to determine an actual differential value; and determine the target current limit value according to the actual operation current and the actual differential value.

[0009] The technical solution has the following advantages or beneficial effects: the target current limit value is dynamically adjusted according to the actual differential value and the actual operation current, so that the target current limit value can be dynamically adjusted in combination with the actual installation situation, configuration situation, and marginal effect sharp reduction phenomenon of the outdoor fan, so that the operation current of the outdoor fan can be timely limited by the target current limit value, thereby avoiding the problem of thermal damage of the outdoor fan winding due to excessive increase of the current.

[0010] In some embodiments, for determining the target current limit value according to the actual operation current and the actual differential value, the controller is specifically configured to: if it is determined that the actual differential value is higher than a preset differential value of the outdoor fan rotation speed to current, a default current limit value of the outdoor fan is obtained, and the default current limit value is taken as the target current limit value; and if it is determined that the actual differential value is lower than the preset differential value, the actual operation current is taken as the target current limit value.

[0011] The technical scheme has the following advantages or beneficial effects: the size relationship between the actual differential value and the preset differential value is used to dynamically adjust the target current limit value by using the actual operating current that is lower than the preset differential value, so that the target current limit value can be dynamically adjusted in combination with the actual installation condition, configuration condition and marginal effect sharp reduction phenomenon of the outdoor fan, the operating current of the outdoor fan is immediately limited by the target current limit value, and thus the problem of thermal damage of the outdoor fan winding caused by excessive current growth is avoided.

[0012] In some embodiments, the preset differential value is a product value of a rated differential value of the outdoor fan speed to current and a preset proportion coefficient, and 0 < the preset proportion coefficient < 1.

[0013] The technical scheme has the following advantages or beneficial effects: the product value of the rated differential value and the preset proportion coefficient is used as the preset differential value, so that the operating current of the outdoor fan is limited by the target current limit value before the outdoor fan causes excessive current growth due to site installation restrictions, import and export configurations or marginal utility sharp reduction, and thus the problem of thermal damage of the outdoor fan winding is avoided.

[0014] In some embodiments, for determining the target current limit value according to the actual operating current, the actual speed value and the actual operating temperature, the controller is specifically configured to: perform differential calculation according to the actual operating current and the actual speed value to determine an actual differential value; if it is determined that the actual differential value is higher than a preset differential value of the outdoor fan speed to current, determine the target current limit value according to the actual operating temperature and the actual operating current; and if it is determined that the actual differential value is lower than the preset differential value, use the actual operating current as the target current limit value.

[0015] The technical scheme has the following advantages or beneficial effects: in the application, the target current limit value is dynamically adjusted by the actual operating current when it is detected that the actual operating temperature of the outdoor fan is about to be abnormal, the operating current of the outdoor fan is limited, the actual current of the outdoor fan is always lower than the target current limit value, and thus the problem of thermal damage of the outdoor fan caused by current increase is avoided.

[0016] In some embodiments, for determining the target current limit value according to the actual operating current and the actual operating temperature, the controller is specifically configured to: if it is determined that the actual operating temperature is higher than a safety temperature threshold of the outdoor fan, use the actual operating current as the target current limit value; and if it is determined that the actual operating temperature is lower than the safety temperature threshold, obtain a default current limit value of the outdoor fan, and use the default current limit value as the target current limit value.

[0017] The technical scheme has the following advantages or beneficial effects: in the application, when the current of the outdoor fan is increased, the target current limit value can be dynamically adjusted by detecting the actual operating temperature change of the outdoor fan in real time, thereby avoiding the problem of thermal damage of the outdoor fan caused by the increase of the actual current, and also avoiding the problem of thermal damage of the outdoor fan caused by the high external installation environment temperature of the outdoor fan.

[0018] In some embodiments, the air conditioner further comprises an IPM module for driving the outdoor fan, and the actual operating temperature is an actual temperature value of the IPM module.

[0019] The technical scheme has the following advantages or beneficial effects: in the application, when the current of the outdoor fan is increased, the target current limit value can be dynamically adjusted by detecting the actual operating temperature change of the outdoor fan in real time, thereby avoiding the problem of thermal damage of the outdoor fan caused by the increase of the actual current, and also avoiding the problem of thermal damage of the outdoor fan caused by the high external installation environment temperature of the outdoor fan.

[0020] In some embodiments, the actual operating information is an actual rotating speed value, and for determining the initial target current of the outdoor fan according to the outdoor environment temperature and the actual operating information, the controller is specifically configured to: determine a target rotating speed value of the outdoor fan according to the outdoor environment temperature; and determine the initial target current according to the target rotating speed value and the actual rotating speed value.

[0021] The technical scheme has the following advantages or beneficial effects: in the application, the actual rotating speed of the outdoor fan is adjusted according to the actual working condition requirement, so that the air conditioner can better improve the heat exchange effect.

[0022] In some embodiments, for determining the final target current of the outdoor fan according to the initial target current and the target current limit value, the controller is specifically configured to: if the initial target current is lower than the target current limit value, the initial target current is taken as the final target current; and if the initial target current is higher than the target current limit value, the target current limit value is taken as the final target current.

[0023] The technical scheme has the following advantages or beneficial effects: in the application, the actual rotating speed of the outdoor fan is adjusted according to the actual working condition requirement, so that the air conditioner can better improve the heat exchange effect, and also avoid the problem of thermal damage of the outdoor fan caused by the increase of the outdoor fan current.

[0024] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings of which:

[0026] Figure 1 is a structural block diagram of an air conditioner according to one embodiment of the present application;

[0027] Figure 2 is a structural block diagram of an air conditioner according to another embodiment of the present application;

[0028] Figure 3 is a flowchart of a controller control process of an air conditioner according to one embodiment of the present application;

[0029] Figure 4 is a graph showing a change in an actual rotation speed value and an actual operating current of an outdoor fan according to one embodiment of the present application;

[0030] Figure 5 is a flowchart of a controller control process of an air conditioner according to another embodiment of the present application;

[0031] Figure 6 is a graph showing a change in an actual operating temperature and an actual operating current of an outdoor fan according to one embodiment of the present application;

[0032] Figure 7 is a graph showing a change in an actual operating temperature and an actual operating current of an outdoor fan according to one embodiment of the present application;

[0033] Figure 8 is a graph showing a change in an actual rotation speed value and an actual operating current of an outdoor fan according to one embodiment of the present application;

[0034] Figure 9 is a flowchart of a controller control process of an air conditioner according to another embodiment of the present application;

[0035] Figure 10 is a flowchart of a controller control process of an air conditioner according to another embodiment of the present application.

[0036] Reference numerals:

[0037] Air conditioner 100;

[0038] Controller 10;

[0039] Refrigerant circuit 1; inverter compressor 2; outdoor heat exchanger 3; indoor heat exchanger 4; expansion valve 5. DETAILED DESCRIPTION

[0040] Embodiments of the present application are described in detail below with reference to the attached drawings, which are exemplary embodiments of the present application. Embodiments of the present application are described in detail below.

[0041] To solve the above problems, the first aspect of the present application provides an air conditioner, which can dynamically adjust the target current limit value through the actual running information of the outdoor fan, so that the target current limit value can adapt to various outdoor fans, thereby completely avoiding the problem of thermal damage of the outdoor fan.

[0042] In an embodiment, as shown in Figure 1 and Figure 2 The air conditioner 100 includes a refrigerant circuit 1, a variable frequency compressor 2, an outdoor heat exchanger 3, an indoor heat exchanger 4, an expansion valve 5, and a controller 6. Among them, the refrigerant circuit 1 circulates refrigeration through the variable frequency compressor 2, the outdoor heat exchanger 3, the expansion valve 4 and the indoor heat exchanger 4 in turn; the outdoor fan is used to change the suction speed of the outdoor air by adjusting the speed of the outdoor fan; the temperature sensor is arranged at the outdoor heat exchanger for detecting the outdoor environment temperature; the controller 10 is connected with the temperature sensor and the outdoor fan.

[0043] Based on the architecture of the above-mentioned air conditioner 100, referring to Figure 3 The controller is configured to perform steps S1-S4, and the specific steps are as follows.

[0044] Step S1, obtaining the outdoor environment temperature and the actual running information of the outdoor fan.

[0045] Among them, the actual running information can be understood as the information of the parameter change of the outdoor fan in the actual running process, or can be understood as the information that can reflect the specifications and actual installation conditions of the outdoor fan that will cause the outdoor fan to be damaged. The actual running information can be temperature, current, speed and air volume information, etc., which is not limited.

[0046] Specifically, the temperature sensor arranged at the outdoor heat exchanger detects the outdoor environment temperature and sends the outdoor environment temperature to the controller, and the controller obtains the outdoor environment temperature. The actual running information of the outdoor fan can be obtained by the sensor and sent to the controller, and the controller obtains the actual running information.

[0047] Step S2, determining the initial target current of the outdoor fan according to the outdoor environment temperature and the actual running information.

[0048] Specifically, the air conditioner provided by the application can adjust the actual rotating speed value of the outdoor fan according to actual working condition requirements. For example, the rotating speed of the outdoor fan can be appropriately increased in high-temperature refrigeration working conditions or low-temperature heating working conditions, so that the air conditioner can better improve the heat exchange effect. Based on this, the actual demand working condition of the air conditioner can be determined according to the outdoor environment temperature, and the rotating speed of the outdoor fan can be determined according to the actual operating information of the outdoor fan. In order to support a higher rotating speed of the outdoor fan, the actual current of the outdoor fan needs to be increased. Therefore, in the application, the initial target current of the outdoor fan is determined according to the outdoor environment temperature and the actual operating information. The actual rotating speed of the outdoor fan can be adjusted in combination with the actual working condition requirements of the air conditioner and the actual operating conditions of the outdoor fan, so that the air conditioner can better improve the heat exchange effect.

[0049] In step S3, the target current limit value of the outdoor fan is determined according to the actual operating information.

[0050] Specifically, the existing air conditioner limits the target current of the indoor fan by using a fixed target current limit value. However, the actual conditions of each outdoor fan are different, and the target current limit value is too large to adapt to the outdoor fan, so that the problem of heat damage of the outdoor fan cannot be completely avoided when the current of the outdoor fan is limited at a high target current limit value. In order to solve this problem, in the application, the target current limit value of the outdoor fan is dynamically adjusted by the actual operating information of the outdoor fan. That is, if the actual installation conditions of the outdoor fan, such as the installation site temperature and the structural configuration of the outdoor fan, affect the increase of the rotating speed of the outdoor fan, and if the current of the outdoor fan is too large during actual operation, it will cause the heat generation of the outdoor fan to increase. In this regard, the application monitors whether the outdoor fan is about to be damaged by heat during actual operation by using the temperature, current, rotating speed and air volume information of the outdoor fan, so as to determine the target current limit value according to the actual operating information of the outdoor fan before the outdoor fan is about to be damaged by heat. For example, the current at which the outdoor fan is about to be damaged by heat or a value lower than the current is taken as the target current limit value, or the preset target current limit value set to avoid heat damage of the outdoor fan is adjusted according to the actual operating information of the outdoor fan. The preset target current limit value can be adjusted by reducing the preset target current limit value according to the current change of the outdoor fan to obtain the target current limit value. Therefore, compared with the way in which the existing air conditioner limits the target current of the indoor fan by using a fixed target current limit value, in the application, the target current limit value is dynamically adjusted by the actual operating information of the outdoor fan, that is, the target current limit value is adaptively adjusted according to the installation conditions, structural configuration and actual operating conditions of the outdoor fan, so that the target current limit value can adapt to various outdoor fans, thereby completely avoiding the problem of heat damage of the outdoor fan.

[0051] Step S4, determining the final target current of the outdoor fan according to the initial target current and the target current limit value.

[0052] Specifically, the initial target current is limited by the target current limit value dynamically adjusted according to the actual running information of the outdoor fan to obtain the final target current of the outdoor fan, so that the problem of heat damage of the outdoor fan caused by the increase of the heat generation of the outdoor fan due to the increase of the current can be avoided under the premise that the heat exchange effect of the air conditioner can be better improved.

[0053] According to the air conditioner provided in the embodiment of the present application, the target current limit value is dynamically adjusted according to the actual running information of the outdoor fan, that is, the target current limit value is adaptively adjusted according to the installation condition, structural configuration and actual running condition of the outdoor fan, so that the initial target current of the outdoor fan can be limited by the target current limit value dynamically adjusted, to make the air conditioner be able to better improve the heat exchange effect under the premise that the problem of heat damage of the outdoor fan caused by the increase of the current can be avoided, thereby, compared with the way that the target current of the indoor fan is limited by the fixed target current limit value in the prior art air conditioner, the target current limit value is dynamically adjusted according to the actual running information of the outdoor fan in the present application, so that the target current limit value can adapt to various outdoor fans, thereby the problem of heat damage of the outdoor fan can be completely avoided.

[0054] In some embodiments, the actual running information includes an actual running current, an actual rotating speed value and an actual running temperature, and for determining the target current limit value of the outdoor fan according to the actual running information, the controller is specifically configured to: determine the target current limit value according to the actual running current and the actual rotating speed value; or determine the target current limit value according to the actual running current and the actual running temperature; or determine the target current limit value according to the actual running current, the actual rotating speed value and the actual running temperature.

[0055] Specifically, due to the narrow grid space of the outdoor fan, the improper configuration of the outdoor fan inlet and outlet, and the poor installation site, the air circulation will be limited, the outdoor fan needs to overcome greater air resistance to push the air flow during operation, according to the characteristics of the outdoor fan, in the case of increased resistance, in order to maintain a certain air volume, the outdoor fan will increase the current to increase the speed, thereby causing the current to increase and the speed to increase abnormally, and when the speed of the outdoor fan is high, on the one hand, the torque demand of the outdoor fan increases rapidly, on the other hand, due to the restriction of the magnetic flux capacity of the outdoor fan, the outdoor fan tends to be magnetically saturated, the torque and speed increase marginal effect of the outdoor fan current increases sharply, that is, when the current of the outdoor fan is larger, the output torque and speed are higher, when the current increases to a certain extent, the outdoor fan tends to be magnetically saturated, and the magnetic field utilization rate tends to be saturated, at this time, the current increase of the outdoor fan cannot cause effective growth of the torque and speed, and the overcurrent of the outdoor fan will cause the winding of the outdoor fan to heat up. In addition, in the case of frosting of the outdoor fan, the current of the outdoor fan will also increase sharply, and the overcurrent of the outdoor fan will cause the winding of the outdoor fan to heat up. In order to solve this problem, the actual operating current and the actual speed value are used to monitor the change of the current increase causing the speed increase in the present application, if it is monitored that the current increase of the outdoor fan cannot cause effective growth of the torque and speed, the target current limit value is obtained by the actual operating current and the actual speed value, for example, the actual operating current when the actual operating current of the outdoor fan cannot cause the speed to increase is taken as the target current limit value, or the current value lower than the actual operating current when the actual operating current of the outdoor fan cannot cause the speed to increase is taken as the target current limit value, so as to limit the operating current of the outdoor fan by the target current limit, that is, before the current of the outdoor fan increases excessively, the operating current of the outdoor fan is limited by the target current limit, thereby avoiding the problem of thermal damage of the winding of the outdoor fan.

[0056] Or, when increasing the outdoor fan speed by increasing the actual current of the outdoor fan, in order to avoid the problem of the outdoor fan overheating and eventually causing the key components of the outdoor fan to be damaged due to the increase in the actual current, and if the external installation environment temperature of the outdoor fan is relatively high, it will also cause the outdoor fan temperature to increase and cause thermal damage, in this application, the target current limit value is determined according to the actual operating temperature and the actual operating current of the outdoor fan, that is, the actual operating current when the actual operating temperature of the outdoor fan is detected to be abnormal is taken as the target current limit value, and the operating current of the outdoor fan is limited, so that the actual current of the outdoor fan is always lower than the target current limit value, thereby avoiding the problem of the outdoor fan being damaged due to the increase in the current. Thus, when the actual operating temperature of the outdoor fan is detected to be abnormal, the target current limit value is dynamically adjusted by the actual operating current, so as to limit the operating current of the outdoor fan by the target current limit value, thereby avoiding the problem of the outdoor fan being damaged due to the increase in the current.

[0057] Or, in order to avoid the problem of the outdoor fan winding being damaged due to excessive growth of the outdoor fan current caused by the narrow grid space of the outdoor fan, the configuration limitation of the outdoor fan inlet and outlet, and the limitation of the site installation, at the same time, in order to avoid the problem of the key components of the outdoor fan being damaged due to the increase in the actual current and the increase in the temperature of the outdoor fan, and if the external installation environment temperature of the outdoor fan is relatively high, it will also cause the outdoor fan temperature to increase and cause thermal damage, the target current limit value is determined according to the actual operating current, the actual speed value and the actual operating temperature, that is, as shown in Figure 4 the actual operating current and the actual speed value of the outdoor fan, if the actual operating current of the outdoor fan is detected to increase without causing the torque and speed to effectively increase, the target current limit value is obtained by the actual operating current and the actual speed value, for example, the actual operating current when the actual operating current of the outdoor fan is increased without causing the speed to increase is taken as the target current limit value, or the current value lower than the actual operating current when the actual operating current of the outdoor fan is increased without causing the speed to increase is taken as the target current limit value, so as to limit the operating current of the outdoor fan by the target current limit, after the outdoor fan runs for a period of time, if the actual operating current when the actual operating temperature of the outdoor fan is detected to be abnormal is taken as the target current limit value, the operating current of the outdoor fan is limited, so that the actual current of the outdoor fan is always lower than the target current limit value, thereby avoiding the problem of the outdoor fan being damaged due to the increase in the current.

[0058] Thus, in the present application, the target current limit value is dynamically adjusted by the actual running current, the actual speed value and the actual running temperature, so that the running current of the outdoor fan is limited by the target current limit value before the current of the outdoor fan excessively increases due to the site installation limitation, the import and export configuration or the marginal utility sharply decreasing, thereby avoiding the problem of thermal damage of the outdoor fan winding, and at the same time, the actual running current is dynamically adjusted to the target current limit value when the temperature of the outdoor fan is abnormal, so that the running current of the outdoor fan is limited by the target current limit value, thereby avoiding the problem of thermal damage of the outdoor fan due to the increase of the current.

[0059] In some embodiments, for determining the target current limit value according to the actual running current and the actual speed value, reference is made to Figure 5 As shown in the figure, the controller is specifically configured to perform steps S5-S6, and the specific steps are as follows.

[0060] Step S5, differential calculation is performed according to the actual running current and the actual speed value to determine the actual differential value.

[0061] The actual differential value can reflect the rate of change of the speed caused by the change of the current of the outdoor fan, which can reflect the efficiency of the conversion of electrical energy to mechanical energy of the motor, that is, the utilization rate of the motor.

[0062] Specifically, the actual running current i and the actual speed value n are subjected to differential calculation to obtain the differential calculation result, which can be represented as dn / di, and the differential calculation result is taken as the actual differential value, and the actual differential value is calculated in real time by the actual running current and the actual speed value, so that the running condition of the outdoor fan and the site installation environment, the grid space, the import and export configuration of the outdoor fan can be monitored by the actual differential value.

[0063] Step S6, determining the target current limit value according to the actual running current and the actual differential value.

[0064] Specifically, due to the narrow grid space of the outdoor fan, the poor configuration of the air inlet and outlet of the outdoor fan, and the poor installation condition on site, the air circulation will be limited when the outdoor fan is running, and the outdoor fan needs to overcome greater air resistance to push the air flow. According to the characteristics of the outdoor fan, in the case of increased resistance, in order to maintain a certain air volume, the outdoor fan will increase the current to increase the speed, thereby causing the differential of the current to the speed to be abnormal, and when the speed of the outdoor fan is high, on the one hand, the torque demand of the outdoor fan increases rapidly, and on the other hand, due to the restriction of the magnetic flux capacity of the outdoor fan and the tendency of magnetic saturation, the marginal effect of the torque and speed obtained by the current increase of the outdoor fan is sharply reduced, that is, when the current of the outdoor fan is greater, the output torque and speed are higher, and when the current grows to a certain extent, the outdoor fan tends to be magnetically saturated, and the utilization rate of the magnetic field tends to be saturated. At this time, the current increase of the outdoor fan cannot cause effective growth of the torque and speed, and the overcurrent of the outdoor fan will cause the winding of the outdoor fan to heat up, and for this, the actual running current of the outdoor fan is monitored through the actual differential value to cause the change of the speed change, so as to judge whether the outdoor fan is about to have a sharp reduction in marginal effect, or whether the actual installation condition and configuration condition of the outdoor fan will cause the current of the outdoor fan to grow excessively, as shown in Figure 4 The change relationship between the actual running current and the actual speed value of the outdoor fan, if the current of the outdoor fan is about to grow excessively is identified through the actual differential value, the target current limit value is determined according to the actual running current, that is, the actual running current is taken as the target current limit value, or the current value lower than the actual running current is taken as the target current limit value, so as to limit the running current of the outdoor fan. That is, before the current of the outdoor fan grows excessively, the running current of the outdoor fan is limited through the target current limit value, so as to avoid the problem of heat damage of the winding of the outdoor fan.

[0065] Therefore, in the present application, the target current limit value is dynamically adjusted through the actual differential value and the actual running current, so as to dynamically adjust the target current limit value in combination with the actual installation condition, the configuration condition and the sharp reduction in marginal effect of the outdoor fan, so as to limit the running current of the outdoor fan in real time through the target current limit value, thereby avoiding the problem of heat damage of the winding of the outdoor fan caused by excessive growth of the current.

[0066] In some embodiments, for determining the target current limit value according to the actual running current and the actual differential value, the controller is specifically configured to: if it is determined that the actual differential value is higher than the preset differential value of the outdoor fan speed to the current, the default current limit value of the outdoor fan is obtained, and the default current limit value is taken as the target current limit value; if it is determined that the actual differential value is lower than the preset differential value, the actual running current is taken as the target current limit value.

[0067] The preset differential value can be understood as an upper limit value of the normal increase rate of the rotation speed caused by the increase of the outdoor fan current. The preset differential value is preset according to the inherent characteristics of the motor and according to the motor specifications.

[0068] Specifically, when the grid space of the outdoor fan is narrow, the air inlet and outlet of the outdoor fan is not well configured, and the on-site installation condition is not good, the air circulation will be limited, and the outdoor fan needs to overcome greater air resistance to push the air flow during operation. According to the characteristics of the outdoor fan, in order to maintain a certain air volume, the outdoor fan will increase the current to increase the rotation speed, thereby causing the differential of the current to the rotation speed to be abnormal. When the rotation speed of the outdoor fan is high, on the one hand, the outdoor fan torque demand grows rapidly, and on the other hand, due to the restriction of the magnetic flux capacity of the outdoor fan and the tendency of magnetic saturation, the marginal effect of the torque and rotation speed obtained by the outdoor fan current increases sharply, that is, when the current of the outdoor fan is larger, the output torque and rotation speed are higher. When the current grows to a certain extent, the outdoor fan tends to be magnetically saturated, and the magnetic field utilization rate tends to be saturated. At this time, the increase of the current of the outdoor fan cannot cause effective growth of the torque and rotation speed, and the overcurrent of the outdoor fan will cause the winding of the outdoor fan to heat up, so in the present application, whether the actual differential value reaches the preset differential value, that is, whether the change of the actual running current of the outdoor fan causing the change of the rotation speed reaches the preset differential value, is used to judge whether the outdoor fan is about to have a sharp marginal effect reduction phenomenon, or whether the actual installation condition and configuration condition of the outdoor fan will cause the current of the outdoor fan to grow excessively, such as Figure 4 As shown in the figure, the change relationship between the actual running current and the actual rotation speed value of the outdoor fan, if it is determined that the actual differential value is lower than the preset differential value, at this time it means that the current of the outdoor fan will grow excessively, then the actual running current is taken as the target current limit value, that is, the actual running current is taken as the target current limit value, or the current value lower than the actual running current is taken as the target current limit value, to limit the running current of the outdoor fan. That is, before the current of the outdoor fan grows excessively, the running current of the outdoor fan is limited by the target current limit value, so as to avoid the problem of thermal damage of the winding of the outdoor fan.

[0069] In addition, if it is determined that the actual differential value is higher than the preset differential value of the rotation speed of the outdoor fan to the current, at this time it means that the actual running current of the outdoor fan suddenly grows excessively, then the default current limit value of the outdoor fan is obtained, wherein the default current limit value can be set as a larger current limit value which can avoid the problem of thermal damage of the fan winding, and the default current limit value is taken as the target current limit value, so as to limit the running current of the outdoor fan by the target current limit value, thereby avoiding the problem of thermal damage of the winding of the outdoor fan.

[0070] Therefore, the size relationship between the actual differential value and the preset differential value is used in the application to dynamically adjust the target current limit value by the actual operating current lower than the preset differential value, so as to dynamically adjust the target current limit value in combination with the actual installation condition, configuration condition and marginal effect sharp reduction phenomenon of the outdoor fan, so as to limit the operating current of the outdoor fan in real time through the target current limit value, and further avoid the problem of thermal damage of the outdoor fan winding caused by excessive growth of the current.

[0071] In some embodiments, the preset differential value is a product value of a rated differential value of the outdoor fan speed to current and a preset proportion coefficient, 0 < preset proportion coefficient < 1. Wherein, the rated differential value can be understood as an actual calibrated differential value caused by speed change in a specified current growth range when the outdoor fan is well installed, the outdoor fan works in the linear region and works under the rated load, the rated differential value is the ideal proportional return rate of the speed change caused by the current growth of the outdoor fan in the ideal state, and the preset proportion coefficient is any value in the range of 0-1, for example, the preset proportion coefficient can be 1 / 2, 2 / 3, 3 / 4 and 5 / 6, etc., which is not limited specifically. Therefore, the product value of the rated differential value and the preset proportion coefficient is used as the preset differential value in the application, so that the operating current of the outdoor fan is limited through the target current limit value before the current of the outdoor fan is excessively increased due to the site installation restriction, import and export configuration or marginal utility sharp reduction, and further the problem of thermal damage of the outdoor fan winding is avoided.

[0072] In some embodiments, for determining the target current limit value according to the actual operating current, the actual speed value and the actual operating temperature, the controller is specifically configured to: perform differential calculation according to the actual operating current and the actual speed value to determine the actual differential value; if it is determined that the actual differential value is higher than the preset differential value of the outdoor fan speed to current, determine the target current limit value according to the actual operating temperature and the actual operating current; if it is determined that the actual differential value is lower than the preset differential value, the actual operating current is used as the target current limit value.

[0073] Specifically, in the present application, whether the actual differential value reaches the preset differential value is used to determine whether the marginal effect of the outdoor fan will be sharply reduced, or whether the actual installation and configuration of the outdoor fan will cause the current of the outdoor fan to excessively increase. If it is determined that the actual differential value is lower than the preset differential value, at this time, it indicates that the current of the outdoor fan will excessively increase, and the actual operating current is taken as the target current limit value, or a current value lower than the actual operating current is taken as the target current limit value, so as to limit the operating current of the outdoor fan. At the same time, when the actual current of the outdoor fan is increased to increase the rotating speed of the outdoor fan, in order to avoid the problem that the heat of the outdoor fan is intensified due to the increase of the actual current, and finally causes the heat damage of the key components of the outdoor fan, and if the external installation environment temperature of the outdoor fan is relatively high, it will also cause the problem of heat damage of the outdoor fan due to the increase of the temperature of the outdoor fan, in the present application, the target current limit value is determined according to the actual operating temperature and the actual operating current of the outdoor fan, so as to limit the actual operating current through the target current limit value, that is, the actual operating current when the actual operating temperature of the outdoor fan is about to be abnormal is taken as the target current limit value, so as to limit the operating current of the outdoor fan, so that the actual current of the outdoor fan is always lower than the target current limit value, as shown in FIG. 8, thereby avoiding the problem of heat damage of the outdoor fan due to the increase of the current. Figure 6 Therefore, in the present application, the target current limit value is dynamically adjusted through the actual operating current, the actual rotating speed value and the actual operating temperature, so as to limit the operating current of the outdoor fan through the target current limit value before the current of the outdoor fan excessively increases due to the site installation restriction, the import and export configuration or the sharp reduction of marginal utility, and then avoid the problem of heat damage of the winding of the outdoor fan, and at the same time, the target current limit value is dynamically adjusted through the actual operating current when the temperature of the outdoor fan is about to be abnormal, so as to limit the operating current of the outdoor fan through the target current limit value, thereby avoiding the problem of heat damage of the outdoor fan due to the increase of the current.

[0074] In addition, if it is determined that the actual differential value is higher than the preset differential value of the rotating speed of the outdoor fan to the current, at this time, it indicates that the actual operating current of the outdoor fan suddenly excessively increases, at this time, in order to avoid the problem that the heat of the outdoor fan is intensified due to the increase of the actual current, and finally causes the heat damage of the key components of the outdoor fan, and if the external installation environment temperature of the outdoor fan is relatively high, it will also cause the problem of heat damage of the outdoor fan due to the increase of the temperature of the outdoor fan, in the present application, the target current limit value is dynamically adjusted through the actual operating current when the actual operating temperature of the outdoor fan is about to be abnormal, so as to limit the operating current of the outdoor fan, so that the actual current of the outdoor fan is always lower than the target current limit value, thereby avoiding the problem of heat damage of the outdoor fan due to the increase of the current.

[0075] In some embodiments, for determining the target current limit value according to the actual operating current and the actual operating temperature, the controller is specifically configured to: if it is determined that the actual operating temperature is higher than the safety temperature threshold of the outdoor fan, taking the actual operating current as the target current limit value; if it is determined that the actual operating temperature is lower than the safety temperature threshold, obtaining a default current limit value of the outdoor fan, and taking the default current limit value as the target current limit value.

[0076] Specifically, when the speed of the outdoor fan is increased by increasing the actual current of the outdoor fan, in order to avoid the problem that the heat of the outdoor fan is intensified due to the increase of the actual current, and eventually leads to the thermal damage of the key components of the outdoor fan, and if the external installation environment temperature of the outdoor fan is relatively high, it will also cause the problem of thermal damage of the outdoor fan due to the increase of the temperature of the outdoor fan. In the present application, the target current limit value can be determined according to the actual operating temperature and the actual operating current of the outdoor fan, so as to limit the actual operating current through the target current limit value, thereby avoiding the problem of thermal damage of the outdoor fan due to the increase of the current. That is, a safety temperature threshold of the outdoor fan is set, wherein the safety temperature threshold is an upper limit of temperature that the outdoor fan can withstand in a normal working state. Since there is a certain distance between the safety temperature threshold and the abnormal temperature threshold of the outdoor fan, if it is detected that the actual operating temperature is higher than the safety temperature threshold of the outdoor fan, the actual operating current is taken as the target current limit value at this time, as shown in the following formula: Figure 7 The change relationship between the actual operating current and the actual operating temperature of the outdoor fan is that the actual operating current when the actual operating temperature of the outdoor fan reaches the safety temperature threshold is taken as the target current limit value, so as to limit the operating current of the outdoor fan, so that the actual current of the outdoor fan is always lower than the target current limit value, so that the actual operating temperature of the outdoor fan is always within the range of the safety temperature threshold. Therefore, in the present application, when the current of the outdoor fan is increased, the target current limit value can be dynamically adjusted by detecting the change of the actual operating temperature of the outdoor fan in real time, thereby avoiding the problem of thermal damage of the outdoor fan due to the increase of the actual current, and also avoiding the problem of thermal damage of the outdoor fan due to the high external installation environment temperature of the outdoor fan.

[0077] In addition, if it is determined that the actual operating temperature is lower than the safety temperature threshold, it means that the actual operating temperature of the outdoor fan is always within the range of the safety temperature threshold, so there is no need to dynamically adjust the target current limit value according to the change of the actual operating temperature of the outdoor fan. Then, the default current limit value of the outdoor fan is obtained, and the default current limit value is taken as the target current limit value.

[0078] In some embodiments, the air conditioner further comprises an IPM (Intelligent Power Module) module for driving the outdoor fan, and the actual operating temperature is an actual temperature value of the IPM module, wherein the actual temperature value of the IPM module can be an actual temperature value of a junction area of a power semiconductor device chip inside the IPM.

[0079] Specifically, when the speed of the outdoor fan is increased by increasing the actual current of the outdoor fan, in order to avoid the problem that the heat of the outdoor fan is intensified due to the increase of the actual current, and eventually leads to the thermal damage of the key components of the outdoor fan such as the IPM module, and if the external installation environment temperature of the outdoor fan is relatively high, it will also cause the problem of thermal damage of the IPM module, in the present application, the target current limit value can be determined according to the actual temperature value of the IPM module and the actual operating current, so as to limit the actual operating current through the target current limit value, thereby avoiding the problem of thermal damage of the IPM module caused by the increase of the current. That is, a safety temperature threshold of the IPM module is set, wherein the safety temperature threshold is an upper limit temperature value that the IPM module can withstand in a normal working state, and since there is a certain distance between the safety temperature threshold and the abnormal temperature threshold of the IPM module, if it is detected that the actual operating temperature is higher than the safety temperature threshold of the outdoor fan, at this time the actual operating current is taken as the target current limit value, that is, the actual operating current when the actual operating temperature of the IPM module reaches the safety temperature threshold is taken as the target current limit value, the operating current of the outdoor fan is limited, so that the actual current of the outdoor fan is always lower than the target current limit value, so that the actual operating temperature of the IPM module is always within the safety temperature threshold range. Thus, in the present application, when the current of the outdoor fan is increased, the target current limit value can be dynamically adjusted by real-time detection of the actual temperature change of the IPM module, thereby avoiding the problem of thermal damage of the IPM module caused by the increase of the actual current, and also avoiding the problem of thermal damage of the IPM module caused by the relatively high external installation environment temperature of the outdoor fan.

[0080] In the embodiments, the actual operating temperature is an actual temperature value of the winding of the outdoor fan, and thus in the present application, when the current of the outdoor fan is increased, the target current limit value can be dynamically adjusted by real-time detection of the actual temperature change of the winding, thereby avoiding the problem of thermal damage of the winding caused by the increase of the actual current, and also avoiding the problem of thermal damage of the winding caused by the relatively high external installation environment temperature of the outdoor fan.

[0081] In some embodiments, the actual operating information is an actual speed value, and for determining the initial target current of the outdoor fan according to the outdoor environment temperature and the actual operating information, the controller is specifically configured to: determine a target speed value of the outdoor fan according to the outdoor environment temperature; and determine the initial target current according to the target speed value and the actual speed value.

[0082] Specifically, the air conditioner of this application can adjust the actual speed of the outdoor fan according to actual operating conditions. For example, in high-temperature cooling or low-temperature heating conditions, the outdoor fan speed can be appropriately increased to improve the heat exchange effect. Based on this, the actual operating conditions of the air conditioner can be determined by the outdoor ambient temperature, and the target speed of the outdoor fan can be determined according to the outdoor ambient temperature. That is, the target speed of the outdoor fan is given according to the actual operating conditions of the air conditioner to improve the heat exchange effect. In order to support a higher outdoor fan speed and achieve a better heat exchange effect, the actual current of the outdoor fan needs to be increased. The initial target current is determined based on the target speed and the actual speed. Figure 8 As shown, the target speed value and the actual speed value are processed by PI and decoupling to obtain the improved initial target current. By comparing the initial target current and the actual operating current, the potential u in the q-axis and d-axis components Uq and Ud are given by PI and decoupling. PWM is output according to the voltage synthesis vectors Uα and Uβ to control the speed of the outdoor motor to rise to the target speed value. Thus, the air conditioner in this application adjusts the actual speed of the outdoor fan according to the actual working conditions, so that the air conditioner can better improve the heat exchange effect.

[0083] In some embodiments, for determining the final target current of the outdoor fan based on the initial target current and the target current limit, the controller is specifically configured to: if the initial target current is lower than the target current limit, then the initial target current is used as the final target current; if the initial target current is higher than the target current limit, then the target current limit is used as the final target current.

[0084] Specifically, if the initial target current is lower than the target current limit, the initial target current will be used as the final target current; if the initial target current is higher than the target current limit, the target current limit will be used as the final target current. Therefore, if... Figure 8 As shown, by comparing the final target current limit with the actual operating current, the potential u in the q-axis and d-axis components is obtained through PI and decoupling calculations. Based on the voltage synthesis vector output, PWM control is used to control the outdoor fan, so that the outdoor fan speed reaches the target speed value. The air conditioner in this application adjusts the actual speed of the outdoor fan according to actual operating conditions, so that the air conditioner can better improve the heat exchange effect, while also avoiding the problem of thermal damage to the outdoor fan caused by increased outdoor fan current.

[0085] The following is for reference. Figure 9 The control process of the air conditioner controller in an embodiment of the present invention will be illustrated by example, and the specific content is as follows.

[0086] Step S7, Begin.

[0087] Step S8: Given the target rotational speed value.

[0088] Step S9, calculate the difference between the actual rotation speed value and the target rotation speed value.

[0089] Step S10, update the initial target current through PI calculation.

[0090] Step S11, determine whether the initial target current is lower than the target current limit value. If yes, execute step S12; otherwise, execute step S17.

[0091] Step S12, calculate the difference between the initial target current and the target current limit value.

[0092] Step S13, update the voltage vector after PI calculation.

[0093] Step S14, adjust the actual rotation speed value of the outdoor fan.

[0094] Step S15, the actual rotation speed value reaches the target rotation speed value.

[0095] Step S16, determine whether the rotation speed requirement changes. If yes, execute step S8; otherwise, execute step S12.

[0096] Step S17, the initial target current reaches the target current limit value.

[0097] The following refers to Figure 10 The control process of the air conditioner controller of the embodiment of the present application is exemplified, and the specific content is as follows.

[0098] Step S18, start.

[0099] Step S19, record the actual rotation speed value and the corresponding actual running current in real time.

[0100] Step S20, determine whether the actual differential value is lower than the preset differential value. If yes, execute step S21; otherwise, execute step S22.

[0101] Step S21, take the actual running current as the target current value.

[0102] Step S22, determine whether the actual running temperature is higher than the safety temperature threshold of the outdoor fan. If yes, execute step S23; otherwise, execute step S19.

[0103] Step S23, take the actual running current as the target current limit value.

[0104] In the description of the description, any process or method descriptions of flow charts or otherwise described herein can be understood as representing modules, segments, or portions of code that include one or more executable instructions for implementing the specified logical functions or processes, and the scope of preferred embodiments of the present application includes alternatives where the functions could be performed in different orders, including substantially concurrently or in reverse order, depending on the functionality involved, as will be understood by those skilled in the art.

[0105] In the description of the description, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present description, the exemplary description of the above terms does not necessarily refer to the same embodiment or example.

[0106] Although embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An air conditioner characterized by comprising: The air conditioner comprises: a refrigerant circuit circulating refrigerant in sequence through a variable frequency compressor, an outdoor heat exchanger, an expansion valve and an indoor heat exchanger; an outdoor fan for changing the suction speed of outdoor air by adjusting the rotating speed of the outdoor fan; a temperature sensor arranged at the outdoor heat exchanger for detecting the outdoor ambient temperature; a controller connected with the temperature sensor and the outdoor fan, the controller being configured to: obtain the outdoor ambient temperature and actual operation information of the outdoor fan; determine an initial target current of the outdoor fan according to the outdoor ambient temperature and the actual operation information; determine a target current limit value of the outdoor fan according to the actual operation information; determine a final target current of the outdoor fan according to the initial target current and the target current limit value; the actual operation information comprises an actual operation current, an actual rotating speed value and an actual operation temperature, the air conditioner further comprises an IPM module for driving the outdoor fan, the actual operation temperature is an actual temperature value of the IPM module, and for determining the target current limit value of the outdoor fan according to the actual operation information, the controller is specifically configured to: determine the target current limit value according to the actual operation current and the actual rotating speed value; or, determine the target current limit value according to the actual operation current and the actual operation temperature; or, determine the target current limit value according to the actual operation current, the actual rotating speed value and the actual operation temperature.

2. The air conditioner of claim 1, wherein For determining the target current limit value according to the actual operation current and the actual rotating speed value, the controller is specifically configured to: determine an actual differential value by differential calculation according to the actual operation current and the actual rotating speed value; determine the target current limit value according to the actual operation current and the actual differential value.

3. The air conditioner of claim 2, wherein For determining the target current limit value according to the actual operation current and the actual differential value, the controller is specifically configured to: if it is determined that the actual differential value is higher than a preset differential value of the rotating speed of the outdoor fan against current, obtain a default current limit value of the outdoor fan, and take the default current limit value as the target current limit value; if it is determined that the actual differential value is lower than the preset differential value, take the actual operation current as the target current limit value.

4. The air conditioner of claim 3, wherein The preset differential value is a product value of a rated differential value of the rotating speed of the outdoor fan against current and a preset proportion coefficient, and 0 < the preset proportion coefficient < 1.

5. The air conditioner of claim 1, wherein For determining the target current limit value according to the actual operation current, the actual rotating speed value and the actual operation temperature, the controller is specifically configured to: determine an actual differential value by differential calculation according to the actual operation current and the actual rotating speed value; if it is determined that the actual differential value is higher than a preset differential value of the rotating speed of the outdoor fan against current, determine the target current limit value according to the actual operation temperature and the actual operation current; if it is determined that the actual differential value is lower than the preset differential value, take the actual operation current as the target current limit value.

6. The air conditioner according to claim 1 or 5, wherein For determining the target current limit value according to the actual operating current and the actual operating temperature, the controller is specifically configured to: if it is determined that the actual operating temperature is higher than a safety temperature threshold of the outdoor fan, taking the actual operating current as the target current limit value; if it is determined that the actual operating temperature is lower than the safety temperature threshold, obtaining a default current limit value of the outdoor fan, and taking the default current limit value as the target current limit value.

7. The air conditioner of claim 1, wherein The actual operating information is an actual rotating speed value, and for determining an initial target current of the outdoor fan according to the outdoor environment temperature and the actual operating information, the controller is specifically configured to: determining a target rotating speed value of the outdoor fan according to the outdoor environment temperature; determining the initial target current according to the target rotating speed value and the actual rotating speed value.

8. The air conditioner of claim 1, wherein For determining a final target current of the outdoor fan according to the initial target current and a target current limit value, the controller is specifically configured to: if the initial target current is lower than the target current limit value, taking the initial target current as the final target current; if the initial target current is higher than the target current limit value, taking the target current limit value as the final target current.

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