WO2022257627A1 - Air conditioner control method and control device, and air conditioner - Google Patents

Abstract

An air conditioner control method and control device, and an air conditioner. The control method comprises: during the operation process of a PTC electric heating device (71), acquiring a real-time current change rate thereof; comparing the real-time current change rate with a real-time current change rate threshold; when a first condition is satisfied, controlling an air guide mechanism (73) of an air conditioner to operate at a conventional air guide angle; and when a second condition is satisfied, controlling the air guide mechanism (73) to operate at an increased air guide angle. The control device comprises: a current change rate acquisition unit (41, 51, 61), a current change rate threshold determination unit (42, 52, 62), a current change rate comparison unit (43, 53, 63), and a control unit (44, 57, 64).

Description

Air conditioner control method, control device and air conditioner

This application is based on a Chinese patent application with application number 202110654860.7 and a filing date of June 11, 2021, and claims the priority of this Chinese patent application. The entire content of this Chinese patent application is hereby incorporated by reference into this application.

technical field

The invention belongs to the technical field of air conditioning, and in particular relates to a control method of an air conditioner, a control device and the air conditioner.

Background technique

At present, many air conditioners are equipped with PTC electric heating devices, and the PTC electric heating devices are used for auxiliary heating to improve the heating effect of the air conditioners.

In the prior art, during the operation of the air conditioner, the air guide angle of the air guide mechanism such as the air guide plate and the swing blade mainly operates according to the angle set by the user. Some air conditioners are equipped with an automatic mode, and in this mode, the air guide angle of the air guide mechanism is also adjusted according to the preset angle.

The Chinese patent application with the publication number CN109595758A discloses a control method of an air conditioner. When receiving the shutdown signal of the air conditioner, the current temperature of the heat exchanger is detected, and the target closing angle of the air guide strip is matched according to the current temperature to control the air guide. The bar moves to the target closing angle to dissipate heat from the heat exchanger. In addition, it is also judged whether the auxiliary electric heating device is turned on. If the electric heating function is turned on, the air guide strip will stop at the current angle to blow waste heat to the heat exchanger and auxiliary electric heater to ensure the comfort of the air conditioner. This Chinese patent application is to adjust the angle of the air guide strip simply according to whether the auxiliary electric heater is turned on after the air conditioner is turned off, so as to solve the problem of affecting the comfort of the air conditioner by blowing waste heat after the shutdown.

Based on the above prior art, it is impossible to know how to adjust the angle of the air guide strip based on the auxiliary electric heating element during the operation of the air conditioner, so as to improve the performance of the air conditioner.

Contents of the invention

One of the objectives of the present invention is to provide a control method for an air conditioner. During the operation of the air conditioner, the air conditioner is controlled based on the working state of the electric heating device, so as to improve the safe operation performance of the air conditioner.

In order to achieve one of the goals of the above invention, the present invention is realized by adopting the following technical solutions:

A control method of an air conditioner, wherein the air conditioner is provided with a PTC electric heating device, the method comprising:

During the working process of the PTC electric heating device, obtain its real-time current change rate;

comparing the real-time current rate of change with a real-time current rate of change threshold;

When the first condition is met, the air guide mechanism of the air conditioner is controlled to operate at a conventional air guide angle; the first condition at least includes that the real-time current rate of change is less than the real-time current rate of change threshold;

When the second condition is met, the air guide mechanism is controlled to operate at an increased air guide angle; the second condition at least includes that the real-time current rate of change is not less than the real-time current rate of change threshold, and the increased The wind guiding angle is greater than the conventional wind guiding angle;

The real-time current rate of change threshold is determined by the following method:

Obtain the real-time fan speed of the indoor unit during the working process of the PTC electric heating device, obtain the current change rate threshold corresponding to the real-time fan speed according to the known correspondence between the fan speed and the current change rate threshold, and determine it as the real-time current Rate of change threshold.

In one of the preferred embodiments, the method also includes:

During the working process of the PTC electric heating device, its real-time temperature change rate is also obtained;

Comparing the real-time temperature change rate with a real-time temperature change rate threshold;

The first condition further includes: the real-time temperature change rate is less than the real-time temperature change rate threshold;

The second condition further includes: the real-time temperature change rate is not less than the real-time current change rate threshold;

The real-time temperature change rate threshold is determined by the following method:

The temperature change rate threshold corresponding to the real-time fan speed is obtained according to the known correspondence between the fan speed and the temperature change rate threshold, and determined as the real-time temperature change rate threshold.

In one of the preferred embodiments, the method also includes:

During the process of controlling the air guide mechanism to operate at an increased air guide angle, continue to judge whether the second condition is met;

If the second condition is not met, control the air guide mechanism to maintain the increased air guide angle to operate;

If the second condition is satisfied, the air guide mechanism is controlled to operate at a re-increased air guide angle; the re-increased air guide angle is greater than the increased air guide angle.

In one of the preferred embodiments, the method also includes:

If the re-increased air guide angle is the maximum air guide angle of the air guide mechanism, and the second condition is still satisfied when the air guide mechanism is controlled to operate at the maximum air guide angle, then close The PTC electric heating device.

In one of the preferred embodiments, the method also includes:

The air conditioner starts to run in heating mode, and obtains the real-time temperature of the indoor heat exchanger after the heating mode runs for a set time;

If the real-time temperature is lower than the set temperature threshold of the indoor heat exchanger, the PTC electric heating device is turned on; otherwise, the PTC electric heating device is turned off.

The second object of the present invention is to provide an air conditioner control device, which controls the air conditioner based on the working state of the auxiliary electric heater during the operation of the air conditioner, so as to improve the safe operation performance of the air conditioner.

In order to realize the second of the above-mentioned purpose of the invention, the present invention adopts the following technical solutions to achieve:

A control device for an air conditioner, wherein a PTC electric heating device is arranged in the air conditioner, and the device includes:

The current change rate acquisition unit is used to obtain the real-time current change rate during the working process of the PTC electric heating device;

The current change rate threshold determination unit is used to obtain the real-time fan speed of the indoor unit during the working process of the PTC electric heating device, and obtain the current change corresponding to the real-time fan speed according to the known correspondence between the fan speed and the current change rate threshold rate threshold, and determined as the real-time current rate of change threshold;

a current rate of change comparison unit, configured to compare the real-time current rate of change with the real-time current rate of change threshold;

The control unit is at least used to control the air guide mechanism of the air conditioner to operate at a normal air guide angle when the first condition is met, and is also used to control the air guide mechanism to operate at an increased air guide angle when the second condition is met Angle operation; the first condition at least includes that the real-time current rate of change is less than the real-time current rate of change threshold; the second condition at least includes that the real-time current rate of change is not less than the real-time current rate of change threshold; the The increased wind guidance angle is greater than the conventional wind guidance angle.

In one of the preferred embodiments, the device also includes:

A temperature change rate acquisition unit, configured to acquire the real-time temperature change rate during the working process of the PTC electric heating device;

A temperature change rate threshold determining unit, configured to obtain the temperature change rate threshold corresponding to the real-time fan speed according to the known correspondence between the fan speed and the temperature change rate threshold, and determine it as the real-time temperature change rate threshold;

a temperature change rate comparison unit, configured to compare the real-time temperature change rate with the real-time temperature change rate threshold;

The first condition further includes: the real-time temperature change rate is less than the real-time temperature change rate threshold;

The second condition further includes: the real-time temperature change rate is not less than the real-time current change rate threshold.

In one of the preferred embodiments, the control unit is further configured to continue to judge whether the second condition is met during the process of controlling the air guide mechanism to operate at an increased air guide angle;

If the second condition is not met, the air guiding mechanism is controlled to maintain the increased wind guiding angle to operate; if the second condition is met, the air guiding mechanism is controlled to operate at the increased wind guiding angle again; The re-increased wind guide angle is greater than the increased wind guide angle;

The control unit is also used to judge whether the re-increased wind guide angle is the maximum wind guide angle of the air guide mechanism; when the re-increased wind guide angle is the maximum wind guide angle, the The control unit is also used to control the air guide mechanism to operate at the maximum air guide angle, and if the second condition is still met, then turn off the PTC electric heating device.

In one of the preferred embodiments, the device also includes:

The indoor heat exchanger temperature acquisition unit is used to obtain the real-time temperature of the indoor heat exchanger after the air conditioner is turned on and runs in the heating mode for a set time in the heating mode;

The indoor heat exchanger temperature comparison unit is used to compare the real-time temperature with the set temperature threshold of the indoor heat exchanger;

The control unit is further configured to turn on the PTC electric heating device to work when the real-time temperature is lower than the preset temperature threshold of the indoor heat exchanger; otherwise, turn off the PTC electric heating device.

The third object of the present invention is to provide an air conditioner with high safe operation performance. The air conditioner includes a PTC electric heating device and an air guide mechanism, and also includes the above-mentioned air conditioner control device.

Compared with the prior art, the advantages and positive effects of the present invention are: the air conditioner control method and control device provided by the present invention control the air conditioner based on the working state of the electric heating device. When the PTC electric heating device is working, Control the air guide angle of the air guide mechanism according to the real-time current change rate of the electric heating device. When the real-time current change rate is less than the real-time current change rate threshold, the air guide mechanism operates at a conventional air guide angle to meet the conventional requirements of the air guide angle; When the real-time current change rate is not less than the threshold value of the real-time current change rate, the air guide mechanism is forced to operate at an increased air guide angle, so as to avoid heat damage to the internal unit components caused by the too small air guide angle that cannot dissipate heat in time, and improve the safe operation performance of the air conditioner ; Moreover, the real-time current change rate threshold is not a fixed value, but a dynamically variable value determined according to the real-time fan speed of the indoor unit, so that the adjustment of the air guide angle is determined according to the operating status of the fan and the operating status of the electric heating device at the same time. It is more reasonable, as far as possible to achieve a balance between conventional needs and safe operation performance, and improve the overall performance of the air conditioner.

Other characteristics and advantages of the present invention will become clearer after reading the detailed description of the present invention in conjunction with the accompanying drawings.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Fig. 1 is the flowchart of the first embodiment of the control method of the air conditioner of the present invention;

Fig. 2 is the flowchart of the second embodiment of the control method of the air conditioner of the present invention;

Fig. 3 is the flow chart of the third embodiment of the control method of the air conditioner of the present invention;

Fig. 4 is the structural block diagram of the first embodiment of the control device of the air conditioner of the present invention;

Fig. 5 is the structural block diagram of the second embodiment of the control device of the air conditioner of the present invention;

Fig. 6 is a structural block diagram of the third embodiment of the control device of the air conditioner of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a flow chart of the first embodiment of the control method of the air conditioner of the present invention. Specifically, it is a flowchart of a method for controlling an air conditioner provided with a PTC electric heating device.

As shown in Figure 1, this embodiment adopts the process that comprises following steps to realize the control of air conditioner:

Step 101: Obtain the real-time current change rate during the working process of the PTC electric heating device.

The real-time current change rate refers to the ratio of the change in current of the PTC electric heating device within a specified time period to the specified time period when the PTC electric heating device is working. Specifically in this step, in the process of starting the PTC electric heating device, the working current value at the beginning of the real-time specified time period and the working current value at the end of the specified time period are respectively obtained, and the difference between the two currents is the specified time period The amount of change of the current; the ratio of the amount of current change to the specified time period can obtain the real-time current change rate.

Step 102: Compare the real-time current change rate with the real-time current change rate threshold.

In this embodiment, the real-time current change rate threshold is a value that can be determined, but it is not a fixed value, but a dynamically variable value, and is a variable value determined according to the real-time fan speed of the indoor unit. Specifically, the air conditioner is preset with a corresponding relationship between the fan speed and the threshold value of the current change rate. The corresponding relationship is generally obtained according to theoretical analysis and experimental testing, and is preset in the memory of the computer board before the air conditioner leaves the factory.

The corresponding relationship between the fan speed and the current change rate threshold can be the corresponding relationship between the fan speed value and the current change rate threshold. For example, the current change rate threshold is a function value of the fan speed value; it can refer to the fan speed range and the current change rate threshold. Correspondence, for example, there are multiple fan speed value ranges, and each speed value range corresponds to a current change rate threshold; it can also be the corresponding relationship between the fan speed gear and the current change rate threshold, for example, the fan speed gear includes There are four gears of high wind speed, medium wind speed, low wind speed, and slight wind speed, and each gear corresponds to a current change rate threshold. At the beginning of the real-time designated time period, obtain the real-time fan speed of the indoor unit, and then obtain the current change rate threshold corresponding to the real-time fan speed according to the known correspondence between the fan speed and the current change rate threshold, and determine it as the real-time current change rate threshold.

When the actual air conditioner is running, the fan speed of the indoor unit changes less frequently, and generally does not change for a long time after the wind speed is set. Therefore, in order to simplify the control process, the process of determining the threshold value of the current change rate of the fan speed after the PTC electric heating device is turned on can be adopted. After that, if the speed of the internal machine does not change, there is no need to perform the process of the threshold value of the current change rate in real time. The determination of the real-time current change rate threshold can only be performed after the speed of the internal machine changes.

Step 103: Execute different controls according to the comparison result in step 102. Specifically, when the first condition is met, the air guide mechanism is controlled to operate at a normal air guide angle; when the second condition is met, the air guide mechanism is controlled to operate at an increased air guide angle.

In this embodiment, the first condition includes that the real-time current rate of change is less than the real-time current rate-of-change threshold, and the second condition includes that the real-time current rate of change is less than the real-time current rate-of-change threshold.

When the first condition is met and the real-time current change rate is less than the real-time current change rate threshold, it is determined that the PTC electric heating device operates stably and safely. In this state, the air guide mechanism is controlled to operate at a conventional air guide angle to meet the conventional requirements of the air guide angle and improve the comfort adjustment of the air conditioner to the air. The air guide structure here includes, but is not limited to, an air guide plate, an air guide strip, and a swing blade for adjusting the air outlet of the air conditioner. The conventional air guide angle refers to the normal air guide angle control. If there is a user-set air guide angle, it refers to the user-set air guide angle; if it is an automatic air guide angle adjustment, it refers to the preset automatic air guide. angle.

When the second condition is met, the real-time current change rate is not less than the real-time current change rate threshold, indicating that the real-time current change rate is large, and it is determined that the PTC electric heating device is unstable and unsafe, or there is a hidden danger of unstable and unsafe operation. In this state, the air guide mechanism is controlled to operate at an increased air guide angle, and the increased air guide angle is greater than the conventional air guide angle. That is to say, when the second condition is met, increase the air guide angle of the air guide mechanism, so that the heat in the indoor unit can be blown out at a faster speed, so as to avoid heating and damage to the components of the indoor unit due to the inability to dissipate heat in time due to too small air guide angle , Improve the safe operation performance of the air conditioner. The increased wind guide angle may be a preset fixed wind guide angle, or a preset fixed wind guide angle added to a conventional wind guide angle.

The control method of the above-mentioned embodiment is adopted to control the air conditioner based on the working state of the PTC electric heating device. When the PTC electric heating device is working, the air guiding angle of the air guiding mechanism is controlled according to the real-time current change rate of the electric heating device. When the current change rate is less than the real-time current change rate threshold, the air guide mechanism operates at a conventional air guide angle to meet the conventional requirements of the air guide angle; when the real-time current change rate is not less than the real-time current change rate threshold, the air guide mechanism is forced to increase Operate at a certain air guide angle to avoid heat damage to the components of the indoor unit due to too small air guide angles that cannot dissipate heat in time, and improve the safe operation performance of the air conditioner; moreover, the real-time current change rate threshold is not a fixed value, but is based on the real-time value of the indoor unit. The dynamic variable value determined by the fan speed enables the adjustment of the air guide angle to be determined according to the operating status of the fan and the electric heating device at the same time. overall performance.

Fig. 2 is a flow chart of the second embodiment of the control method of the air conditioner of the present invention. Specifically, it is a flow chart of another embodiment for controlling an air conditioner provided with a PTC electric heating device.

As shown in Figure 2, this embodiment adopts the process that comprises the following steps to realize the control of the air conditioner:

Step 201: Obtain the real-time current change rate and real-time temperature change rate during the working process of the PTC electric heating device.

For the parameter definition and acquisition method of the real-time current change rate, refer to the corresponding description of the embodiment in FIG. 1 .

The real-time temperature change rate refers to the real-time temperature change rate of the PTC electric heating device, which is the ratio of the temperature change within the specified time period to the specified time period when the PTC electric heating device is working. Specifically in this step, during the start-up process of the PTC electric heating device, the temperature of the PTC electric heating device at the beginning of the real-time specified time period and the temperature of the PTC electric heating device at the end of the specified time period are obtained respectively, and the difference between the two temperatures is The value is the change of temperature within the specified time period; the real-time temperature change rate can be obtained by calculating the ratio of the change of temperature to the specified time period.

Step 202: Compare the real-time current change rate with the real-time current change rate threshold, and compare the real-time temperature change rate with the real-time temperature change rate threshold.

For the meaning and determination method of the threshold value of the real-time current change rate, refer to the corresponding description of the embodiment in FIG. 1 .

Similar to the real-time current change rate threshold, in this embodiment, the real-time temperature change rate threshold is a value that can be determined, but it is not a fixed value, but a dynamically variable value, and is based on the real-time Variable value determined by fan speed. Specifically, the air conditioner is preset with a corresponding relationship between the fan speed and the temperature change rate threshold. The corresponding relationship is generally obtained based on theoretical analysis and experimental testing, and is preset in the memory of the computer board before the air conditioner leaves the factory.

The corresponding relationship between the fan speed and the temperature change rate threshold can be the corresponding relationship between the fan speed value and the temperature change rate threshold. For example, the temperature change rate threshold is a function value of the fan speed value; it can also refer to the fan speed range and the temperature change rate threshold. For example, a plurality of fan speed value ranges are set, and each speed value range corresponds to a temperature change rate threshold. At the beginning of the real-time designated time period, obtain the real-time fan speed of the indoor unit, and then obtain the temperature change rate threshold corresponding to the real-time fan speed according to the known correspondence between the fan speed and the temperature change rate threshold, and determine it as the real-time temperature change rate threshold.

Similarly, in order to simplify the control process, combined with the actual situation that the fan speed of the indoor unit changes less frequently, the process of determining the threshold value of the temperature change rate of the fan speed after the PTC electric heating device is turned on can be adopted. After that, if the speed of the indoor unit does not change , it is not necessary to carry out the process of the threshold value of the temperature change rate in real time, and it is only necessary to perform the determination of the real-time temperature change rate threshold value after the speed of the internal machine changes.

Step 203: Execute different controls according to the comparison result in step 202. Specifically, when the first condition is met, the air guiding mechanism is controlled to operate at a normal air guiding angle; when the second condition is met, the air guiding mechanism is controlled to operate at an increased air guiding angle.

In this embodiment, the first condition includes that the real-time current rate of change is less than the real-time current rate-of-change threshold, and also includes that the real-time temperature rate of change is less than the real-time temperature rate-of-change threshold; the second condition includes that the real-time current rate of change is less than the real-time current rate-of-change threshold, and also includes The real-time temperature change rate is not less than the real-time temperature change rate threshold.

When the first condition is met, the real-time current change rate is less than the real-time current change rate threshold, and at the same time, the real-time temperature change rate is less than the real-time temperature change rate threshold, then it is determined that the PTC electric heating device operates stably and safely. In this state, the air guide mechanism is controlled to operate at a conventional air guide angle to meet the conventional requirements of the air guide angle and improve the comfort adjustment of the air conditioner to the air. For the meanings of the air guide mechanism and the conventional air guide angle, refer to the corresponding description of the embodiment in FIG. 1 .

When the second condition is met, the real-time current change rate is not less than the real-time current change rate threshold, and the real-time temperature change rate is not less than the real-time temperature change rate threshold, indicating that the real-time current change rate is large, and the real-time temperature change rate is also large, then it is determined that the PTC electric current The heating device operates unstable and unsafe, or there is a hidden danger of unstable and unsafe operation. In this state, the air guide mechanism is controlled to operate at an increased air guide angle, and the increased air guide angle is greater than the conventional air guide angle. That is to say, when the second condition is met, increase the air guide angle of the air guide mechanism, so that the heat in the indoor unit can be blown out at a faster speed, so as to avoid heating and damage to the components of the indoor unit due to the inability to dissipate heat in time due to too small air guide angle , Improve the safe operation performance of the air conditioner.

The second embodiment uses both the current change rate and the temperature change rate of the PTC electric heating device as the factors for regulating the air guide angle, which is closer to the operating state of the PTC electric heating device, the judgment basis is more accurate, and the safety control performance is better. Stable and reliable. For other technical effects of this embodiment, refer to the description of the embodiment in FIG. 1 .

Fig. 3 is a flow chart of the third embodiment of the control method of the air conditioner of the present invention. Specifically, it is also a method flow chart of another embodiment for performing control on an air conditioner provided with a PTC electric heating device.

As shown in Figure 3, this embodiment adopts the process that comprises the following steps to realize the control of the air conditioner:

Step 301: The air conditioner is turned on and runs in heating mode, and obtains the real-time temperature of the indoor heat exchanger after running for a set time.

The real-time temperature of the indoor heat exchanger refers to the temperature of the indoor heat exchanger collected according to the set sampling period. Specifically, the temperature can be measured by a temperature sensor installed on the indoor heat exchanger. The set time is preset at a time, which is generally a time value for the air conditioner to reach a stable state. The real-time temperature of the indoor heat exchanger obtained after running for the set time reflects the temperature at which the indoor heat exchanger reaches a relatively stable state in the heating mode.

Step 302: Compare whether the acquired real-time temperature of the indoor heat exchanger is lower than the set temperature threshold. If yes, go to step 304; otherwise, go to step 303.

The set temperature threshold is a known preset value, which can reflect whether the indoor heat exchanger can meet the heating demand.

Step 303: If it is determined in step 302 that the real-time temperature of the indoor heat exchanger is not less than the set temperature threshold, indicating that the independent operation of the indoor heat exchanger can meet the heating demand, then turn off the PTC electric heating device. If the PTC electric heating device is not turned on before performing this process, turning off the PTC electric heating device refers to keeping the PTC electric heating device in an off state.

Step 304: If it is determined in step 302 that the real-time temperature of the indoor heat exchanger is lower than the set temperature threshold, indicating that the independent work of the indoor heat exchanger cannot meet the heating demand, then turn on the PTC electric heating device to perform auxiliary heating to meet the heating demand . After turning on the PTC electric heating device, obtain its real-time current change rate. For the parameter definition and acquisition method of the real-time current change rate, refer to the corresponding description of the embodiment in FIG. 1 .

Step 305: Compare the real-time current change rate with the real-time current change rate threshold.

For the meaning and determination method of the threshold value of the real-time current change rate, refer to the corresponding description of the embodiment in FIG. 1 .

Step 306: Determine whether the first condition is met. If yes, go to step 307; otherwise, go to step 308.

Same as the embodiment in FIG. 1 , the first condition includes that the real-time current change rate is smaller than the real-time current change rate threshold.

Step 307: When the first condition is met, it is determined that the PTC electric heating device is stable and safe. In this state, the air guide mechanism is controlled to operate at a conventional air guide angle to meet the conventional requirements of the air guide angle and improve the comfort adjustment of the air conditioner to the air. For the meanings of the air guide mechanism and the conventional air guide angle, refer to the corresponding description of the embodiment in FIG. 1 .

Step 308: If it is determined in step 306 that the first condition is not met, then the second condition is met. The second condition means that the real-time current rate of change is not less than the real-time current rate of change threshold. In this state, it is judged that the operation of the PTC electric heating device is unstable and unsafe, or there is a hidden danger of unstable and unsafe operation, and the air guide mechanism will be controlled to operate at an increased air guide angle. Also, the increased wind guide angle is larger than the conventional wind guide angle. That is to say, when the second condition is met, increase the air guide angle of the air guide mechanism, so that the heat in the indoor unit can be blown out at a faster speed, so as to avoid heating and damage to the components of the indoor unit due to the inability to dissipate heat in time due to too small air guide angle , Improve the safe operation performance of the air conditioner.

Step 309: During the process of controlling the air guide mechanism to operate at an increased air guide angle, continue to acquire the real-time current change rate, compare it with the real-time current change rate threshold, and determine whether the second condition is satisfied. If yes, execute step 310; otherwise, continue to execute step 308, control the air guiding mechanism to continue to operate at an increased air guiding angle, and minimize the forced increase of the air guiding angle to affect the comfort of the air conditioning.

Step 310 : Control the air guide mechanism to operate at a re-increased air guide angle.

If the second condition is still satisfied during the operation of the air guide mechanism at the increased air guide angle, it indicates that although the air guide angle is increased, the PTC electric heating device still operates unstable, unsafe, or still has unstable operation Unsafe hidden danger. In this state, the air guide angle will continue to be increased, and the air guide mechanism will be controlled to operate at the increased air guide angle again, so as to avoid heat damage to the internal unit components due to the too small air guide angle that cannot dissipate heat in time, and improve the safe operation of the air conditioner. performance. The increased wind guide angle can be a preset fixed wind guide angle, or a preset fixed wind guide angle added to the increased wind guide angle.

Step 311: Determine whether the increased air guiding angle is the maximum air guiding angle of the air guiding mechanism. And when the air guide angle increased again is the maximum air guide angle, and when the air guide mechanism is controlled to operate at the maximum air guide angle, continue to obtain the real-time current change rate, compare it with the real-time current change rate threshold, and determine whether it satisfies Second condition. If the second condition is satisfied, execute step 312; otherwise, continue to execute step 310 to control the air guiding mechanism to continue to operate at the increased air guiding angle again.

Step 312: Turn off the electric heating device.

If the increased air guide angle is the maximum air guide angle, and the second condition is still satisfied when the air guide mechanism operates at the maximum air guide angle, and the real-time current change rate is not less than the real-time current change rate threshold, in order to ensure safety, turn off the electric heating device.

With the control method of this embodiment, only when the real-time temperature of the indoor heat exchanger is lower than the set temperature threshold, the PTC electric heating device is turned on for auxiliary heating, and the auxiliary heating is avoided when the indoor heat exchanger works alone and can meet the heating demand. It wastes energy consumption; when the PTC electric heating device is running unstable, adopt the method of gradually increasing the air guide angle to avoid increasing the air guide angle too much and deviating from the conventional air guide angle requirements, which will affect the comfort of air conditioning ; When the air guide angle is increased to the maximum angle and there is still unstable and unsafe operation, turn off the PTC electric heating device to ensure the safety of the air conditioner. Thus, the conventional demand control and safe operation performance can be balanced to the greatest extent, and the overall performance of the air conditioner can be improved.

Fig. 4 is a structural block diagram of the first embodiment of the control device of the air conditioner of the present invention. In this embodiment, the air conditioner includes a PTC electric heating device 71 , an indoor fan 72 and an air guiding mechanism 73 .

As shown in Figure 4, the control device of this embodiment includes:

The current change rate acquisition unit 41 is configured to acquire the real-time current change rate of the PTC electric heating device 71 during operation.

The current change rate threshold determination unit 42 is used to obtain the real-time fan speed of the indoor unit extension 72 during the operation of the PTC electric heating device 71, and obtain the current corresponding to the real-time fan speed according to the known correspondence between the fan speed and the current change rate threshold The rate-of-change threshold is determined as the real-time current rate-of-change threshold.

The current change rate comparison unit 43 is configured to compare the real-time current change rate with the real-time current change rate threshold.

The control unit is at least used to control the air guide mechanism 73 to operate at a normal air guide angle when the first condition is met, and is also used to control the air guide mechanism 73 to operate at an increased air guide angle when the second condition is met. Wherein, the first condition at least includes that the real-time current rate of change is less than the real-time current rate-of-change threshold; the second condition at least includes that the real-time current rate of change is not less than the real-time current rate-of-change threshold; and the increased wind guide angle is greater than the normal wind guide angle.

The control device with the above structure executes the corresponding control program, executes the control of the air conditioner according to the flow of the method embodiment in FIG. 1 , and obtains the technical effect of the embodiment in FIG. 1 .

Fig. 5 is a structural block diagram of the second embodiment of the control device of the air conditioner of the present invention. In this embodiment, the air conditioner includes a PTC electric heating device 71 , an indoor fan 72 and an air guiding mechanism 73 .

As shown in Figure 5, the control device of this embodiment includes:

For the functions of the current rate of change acquisition unit 51 , the current rate of change threshold determination unit 52 , and the current rate of change comparison unit 53 , refer to the corresponding description of the embodiment in FIG. 4 .

In addition, the control device of the second embodiment also includes:

The temperature change rate acquisition unit 54 is configured to acquire the real-time temperature change rate of the PTC electric heating device 71 during operation.

The temperature change rate threshold determining unit 55 is configured to obtain the temperature change rate threshold corresponding to the real-time fan speed of the indoor unit fan 72 according to the known correspondence between the fan speed and the temperature change rate threshold, and determine it as the real-time temperature change rate threshold.

The temperature change rate comparison unit 56 is configured to compare the real-time temperature change rate with the real-time temperature change rate threshold.

The control unit 57 is at least used to control the air guide mechanism 73 to operate at a conventional air guide angle when the first condition is met, and is also used to control the air guide mechanism 73 to operate at an increased air guide angle when the second condition is met . Among them, the first condition includes that the real-time current rate of change is less than the real-time current rate of change threshold, and also includes that the real-time temperature rate of change is less than the real-time temperature rate of change threshold; the second condition includes that the real-time current rate of change is not less than the real-time current rate of change threshold. The rate of change is less than the threshold value of the real-time temperature change rate; and the increased air guide angle is greater than the conventional air guide angle.

The control device with the above structure executes the corresponding control program, executes the control of the air conditioner according to the flow of the method embodiment in FIG. 2 , and obtains the technical effect of the embodiment in FIG. 2 .

Fig. 6 is a structural block diagram of the third embodiment of the control device of the air conditioner of the present invention. In this embodiment, the air conditioner includes a PTC electric heating device 71 , an indoor fan 72 , an air guiding mechanism 73 and an indoor heat exchanger 74 .

As shown in Figure 6, the control device of this embodiment includes:

For the functions of the current rate of change acquisition unit 61 , the current rate of change threshold determination unit 62 , and the current rate of change comparison unit 63 , refer to the corresponding description of the embodiment in FIG. 4 .

In addition, the control device of the third embodiment also includes:

The indoor heat exchanger temperature acquisition unit 66 is used to acquire the real-time temperature of the indoor heat exchanger 74 after the air conditioner is turned on and runs in the heating mode for a set time in the heating mode.

The indoor heat exchanger temperature comparison unit 66 is used to compare the real-time temperature with the set temperature threshold of the indoor heat exchanger.

The control unit 64 is at least used to control the air guide mechanism 73 to operate at a conventional air guide angle when the first condition is met, and is also used to control the air guide mechanism 73 to operate at an increased air guide angle when the second condition is met . Wherein, the first condition at least includes that the real-time current rate of change is less than the real-time current rate-of-change threshold; the second condition at least includes that the real-time current rate of change is not less than the real-time current rate-of-change threshold; and the increased wind guide angle is greater than the normal wind guide angle. In addition, the control unit 64 is also used to turn on the PTC electric heating device 71 when the real-time temperature is lower than the set temperature threshold of the indoor heat exchanger; otherwise, turn off the PTC electric heating device 71 .

The control device with the above structure executes the corresponding control program, executes the control of the air conditioner according to the flow of the method embodiment in FIG. 3 , and obtains the technical effect of the embodiment in FIG. 3 .

The control devices for air conditioners in the above embodiments are applied to air conditioners with PTC electric heating elements to control the air guide mechanism and PTC electric heating elements of the air conditioners, so as to obtain air conditioners with high safe operation performance.

In addition, the technical solutions of the various embodiments of the present invention can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered as a combination of technical solutions. Does not exist, nor is it within the scope of protection required by the present invention.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art can still understand the foregoing embodiments. Modifications are made to the technical solutions described, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed in the present invention.

Claims (10)

1. A control method of an air conditioner, wherein the air conditioner is provided with a PTC electric heating device, characterized in that the method comprises:

   During the working process of the PTC electric heating device, obtain its real-time current change rate;

   comparing the real-time current rate of change with a real-time current rate of change threshold;

   When the first condition is met, the air guide mechanism of the air conditioner is controlled to operate at a conventional air guide angle; the first condition at least includes that the real-time current rate of change is less than the real-time current rate of change threshold;

   When the second condition is met, the air guide mechanism is controlled to operate at an increased air guide angle; the second condition at least includes that the real-time current rate of change is not less than the real-time current rate of change threshold, and the increased The wind guiding angle is greater than the conventional wind guiding angle;

   The real-time current rate of change threshold is determined by the following method:

   Obtain the real-time fan speed of the indoor unit during the working process of the PTC electric heating device, obtain the current change rate threshold corresponding to the real-time fan speed according to the known correspondence between the fan speed and the current change rate threshold, and determine it as the real-time current Rate of change threshold.
2. The control method of an air conditioner according to claim 1, wherein the method further comprises:

   During the working process of the PTC electric heating device, its real-time temperature change rate is also obtained;

   Comparing the real-time temperature change rate with a real-time temperature change rate threshold;

   The first condition further includes: the real-time temperature change rate is less than the real-time temperature change rate threshold;

   The second condition further includes: the real-time temperature change rate is not less than the real-time current change rate threshold;

   The real-time temperature change rate threshold is determined by the following method:

   The temperature change rate threshold corresponding to the real-time fan speed is obtained according to the known correspondence between the fan speed and the temperature change rate threshold, and determined as the real-time temperature change rate threshold.
3. The control method of the air conditioner according to claim 1 or 2, characterized in that the method further comprises:

   During the process of controlling the air guide mechanism to operate at an increased air guide angle, continue to judge whether the second condition is met;

   If the second condition is not met, control the air guide mechanism to maintain the increased air guide angle to operate;

   If the second condition is satisfied, the air guide mechanism is controlled to operate at a re-increased air guide angle; the re-increased air guide angle is greater than the increased air guide angle.
4. The control method of an air conditioner according to claim 3, wherein the method further comprises:

   If the re-increased air guide angle is the maximum air guide angle of the air guide mechanism, and the second condition is still satisfied when the air guide mechanism is controlled to operate at the maximum air guide angle, then close The PTC electric heating device.
5. The control method of the air conditioner according to claim 1 or 2, characterized in that the method further comprises:

   The air conditioner starts to run in heating mode, and obtains the real-time temperature of the indoor heat exchanger after the heating mode runs for a set time;

   If the real-time temperature is lower than the set temperature threshold of the indoor heat exchanger, the PTC electric heating device is turned on; otherwise, the PTC electric heating device is turned off.
6. A control device for an air conditioner, wherein the air conditioner is provided with a PTC electric heating device, characterized in that the device includes:

   The current change rate acquisition unit is used to obtain the real-time current change rate during the working process of the PTC electric heating device;

   The current change rate threshold determination unit is used to obtain the real-time fan speed of the indoor unit during the working process of the PTC electric heating device, and obtain the current change corresponding to the real-time fan speed according to the known correspondence between the fan speed and the current change rate threshold rate threshold, and determined as the real-time current rate of change threshold;

   a current rate of change comparison unit, configured to compare the real-time current rate of change with the real-time current rate of change threshold;

   The control unit is at least used to control the air guide mechanism of the air conditioner to operate at a normal air guide angle when the first condition is met, and is also used to control the air guide mechanism to operate at an increased air guide angle when the second condition is met Angle operation; the first condition at least includes that the real-time current rate of change is less than the real-time current rate of change threshold; the second condition at least includes that the real-time current rate of change is not less than the real-time current rate of change threshold; the The increased wind guidance angle is greater than the conventional wind guidance angle.
7. The control device of an air conditioner according to claim 6, wherein the device further comprises:

   A temperature change rate acquisition unit, configured to acquire the real-time temperature change rate during the working process of the PTC electric heating device;

   A temperature change rate threshold determining unit, configured to obtain the temperature change rate threshold corresponding to the real-time fan speed according to the known correspondence between the fan speed and the temperature change rate threshold, and determine it as the real-time temperature change rate threshold;

   a temperature change rate comparison unit, configured to compare the real-time temperature change rate with the real-time temperature change rate threshold;

   The first condition further includes: the real-time temperature change rate is less than the real-time temperature change rate threshold;

   The second condition further includes: the real-time temperature change rate is not less than the real-time current change rate threshold.
8. The control device for an air conditioner according to claim 6 or 7, wherein the control unit is further configured to continue judging whether the air guide mechanism satisfies the requirements during the process of controlling the air guide mechanism to operate at an increased air guide angle. second condition;

   If the second condition is not met, the air guiding mechanism is controlled to maintain the increased wind guiding angle to operate; if the second condition is met, the air guiding mechanism is controlled to operate at the increased wind guiding angle again; The re-increased wind guide angle is greater than the increased wind guide angle;

   The control unit is also used to judge whether the re-increased wind guide angle is the maximum wind guide angle of the air guide mechanism; when the re-increased wind guide angle is the maximum wind guide angle, the The control unit is also used to control the air guide mechanism to operate at the maximum air guide angle, and if the second condition is still met, then turn off the PTC electric heating device.
9. The control device for an air conditioner according to claim 6 or 7, wherein the device further comprises:

   The indoor heat exchanger temperature acquisition unit is used to obtain the real-time temperature of the indoor heat exchanger after the air conditioner is turned on and runs in the heating mode for a set time in the heating mode;

   The indoor heat exchanger temperature comparison unit is used to compare the real-time temperature with the set temperature threshold of the indoor heat exchanger;

   The control unit is further configured to turn on the PTC electric heating device to work when the real-time temperature is lower than the preset temperature threshold of the indoor heat exchanger; otherwise, turn off the PTC electric heating device.
10. An air conditioner, comprising a PTC electric heating device and an air guide mechanism, characterized in that the air conditioner also includes the control device of the air conditioner according to any one of claims 6 to 9 above.

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