CN111251824B - Control method and control device of air conditioner and air conditioner - Google Patents
Control method and control device of air conditioner and air conditioner Download PDFInfo
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- CN111251824B CN111251824B CN202010063585.7A CN202010063585A CN111251824B CN 111251824 B CN111251824 B CN 111251824B CN 202010063585 A CN202010063585 A CN 202010063585A CN 111251824 B CN111251824 B CN 111251824B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
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Abstract
The invention provides a control method and a control device of an air conditioner and the air conditioner. The method comprises the following steps: acquiring the current operating frequency of the air conditioner and a first target operating frequency corresponding to the current operating frequency; determining the input current transmitted by the battery assembly to the air conditioner; and adjusting the first target operation frequency according to the input current and the current operation frequency to obtain an adjusted second target operation frequency. The control method of the invention adjusts the target operation frequency of the air conditioner through the current, avoids the problem that the battery assembly cannot be protected in time due to detection errors when the frequency is adjusted according to the voltage, can better protect the battery assembly, and only utilizes the current of the input end and the operation frequency of the air conditioner as limiting conditions, does not need to additionally arrange a detection line for detecting the output voltage or the current of the battery assembly, reduces the cost and simplifies the installation and maintenance steps.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of an air conditioner, a control device of the air conditioner and the air conditioner.
Background
The existing plug-in type vehicle air conditioner is powered by a storage battery, has a protection function aiming at the storage battery, the voltage of the storage battery can directly reflect the electric quantity of the storage battery, so most of the external type vehicle air conditioner is protected by taking the voltage of the storage battery as a basis, but the limitation on the frequency of a compressor according to the voltage has certain disadvantages, because the power consumed by the same frequency of the compressor is different under different environments of different temperature, humidity and pressure, the consumption of the electric quantity of the storage battery is not the same, so the protection effect can be different under different environments, and the method can cause the risk of failure in some extreme environments, and cannot protect the storage battery.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the present invention is directed to a method for controlling an air conditioner.
A second aspect of the present invention is to provide a control apparatus of an air conditioner.
A third aspect of the present invention is to provide an air conditioner.
In view of the above, according to a first aspect of the present invention, there is provided a control method of an air conditioner including a battery pack that supplies power to the air conditioner through a power supply line, the control method including: acquiring the current operating frequency of the air conditioner and a first target operating frequency corresponding to the current operating frequency; determining the input current transmitted by the battery assembly to the air conditioner; and adjusting the first target operation frequency according to the input current and the current operation frequency to obtain an adjusted second target operation frequency.
The control method of the air conditioner provided by the invention obtains the current operating frequency of the air conditioner and the first target operating frequency corresponding to the current operating frequency, determines the input current consumed by the air conditioner when executing the current operating frequency, and adjusts the first target operating frequency according to the current operating frequency by taking the input current as an adjusting condition so as to obtain the adjusted second target operating frequency. On one hand, the target operation frequency of the air conditioner is adjusted through the current, permanent damage to a battery caused by over discharge of the battery assembly due to over large air conditioning load when the battery assembly is low in electric quantity is prevented, the battery assembly can be better protected, and because only the current of an input end and the operation frequency of the air conditioner are used as limiting conditions, a detection line for detecting the output voltage or the current of the battery assembly is not required to be additionally arranged, the cost is reduced, the installation and maintenance steps are simplified, and faults caused by installation errors are reduced; on the other hand, the problem that the battery pack cannot be protected in time due to detection errors when frequency adjustment is carried out according to voltage is avoided, and the application range of the product is widened.
Specifically, since the output voltage and the output current determine the output power of the battery pack, that is, the output power of the battery pack = the output voltage of the battery pack × the output current of the battery pack, and the output power of the battery pack must be balanced with the load power, the output power of the battery pack-the boost loss power = the load power, the compressor power, the fan power, and the like are protected by the load power, but the compressor power occupies most of the power, and the compressor load power is proportional to the frequency of the compressor during normal operation of the air conditioner, so that the load power can be adjusted by adjusting the frequency of the compressor, and the output power of the battery pack is changed while the voltage of the battery pack is almost unchanged, so that the output current of the battery pack is changed by adjusting the frequency of the. Therefore, the battery pack to be protected limits the output power of the battery pack, that is, limits the output current of the battery pack, and the output power of the battery pack is naturally balanced with the load power, so that the air conditioner frequency needs to be adjusted by limiting the input current.
In addition, according to the control method of the air conditioner in the above technical solution provided by the present invention, the following additional technical features may be further provided:
in the above technical solution, further, adjusting the first target operating frequency according to the input current, and the current operating frequency specifically includes: comparing the magnitude relation between the input current and a first input current threshold value; and when the input current is detected to be larger than or equal to the first input current threshold value, adjusting the first target operation frequency according to the preset frequency difference and the current operation frequency.
In the technical scheme, the magnitude relation between the input current and the first input current threshold is compared, if the input current is greater than or equal to the first input current threshold, which indicates that the current value required to be consumed is too large, the current running frequency is reduced according to a preset frequency difference, the reduced current running frequency is used as a second target running frequency which can be executed in the current cycle, and if the input current in the next cycle is still greater than or equal to the first input current threshold, the current running frequency is continuously reduced according to the preset frequency difference until the input current is less than the first input current threshold. Therefore, the target operation frequency of the air conditioner is limited through the first input current threshold and the input current, permanent damage to the battery caused by excessive discharge of the battery assembly due to overlarge air conditioning load when the battery assembly is low in electric quantity is prevented, and the battery assembly can be better protected.
In any of the above technical solutions, further, adjusting the first target operating frequency according to the input current and the current operating frequency specifically includes: judging that the input current is greater than or equal to a second input current threshold value, and comparing the magnitude relation between the current operating frequency and the first target operating frequency; detecting that the current operating frequency is less than the first target operating frequency, and taking the current operating frequency as a second target operating frequency; and detecting that the current operating frequency is greater than or equal to the first target operating frequency, and taking the first target operating frequency as a second target operating frequency.
According to the technical scheme, after the input current is determined to be smaller than the first input current threshold value, the current operating frequency and the target operating frequency are compared, and the smaller value of the current operating frequency and the target operating frequency is selected as the second target operating frequency, so that the battery assembly is protected on the basis that the air conditioner can meet the use requirement of a user.
In any of the above technical solutions, further, adjusting the first target operating frequency according to the input current and the current operating frequency specifically includes: detecting that the input current is smaller than a first input current threshold value, and judging whether the input current is smaller than a second input current threshold value; judging that the input current is smaller than a second input current threshold value, and comparing the magnitude relation between the current operating frequency and the first target operating frequency; and adjusting the first target operation frequency to be a final target operation frequency of a compressor of the air conditioner according to the magnitude relation between the current operation frequency and the first target operation frequency, wherein the first input current threshold value is larger than the second input current threshold value.
In the technical scheme, the input current is further limited through the second input current threshold, and if the input current is smaller than the second input current threshold, it is indicated that the air conditioner cannot be damaged even if the operation frequency reaches the first target operation frequency corresponding to the current operation frequency in the process of the on-demand operation of the air conditioner, and the first target operation frequency is used as the final target operation frequency of the compressor, so that the air conditioner can meet the use requirement of a user.
Specifically, it is considered that the line loss voltage is reduced due to a current drop at the time of frequency modulation, at which timeThe input voltage of the air conditioner is increased, so that the frequency and the current can repeatedly and rapidly jump, and therefore, a second input current threshold value, namely I, is determined according to the first input current threshold value and the preset current return differencelmtRst=Ilmt-deltaI, wherein IlmtRstRepresenting a first input current threshold, IlmtAnd the delta I represents a second input current threshold value, the delta I represents a preset current return difference, the value range of the delta I is between 0.5A and 2A, and the problem of frequency repeated fluctuation caused by frequency adjustment is prevented through the preset current return difference.
In any of the above technical solutions, further adjusting the first target operating frequency to a final target operating frequency of the compressor according to a magnitude relationship between the current operating frequency and the first target operating frequency specifically includes: judging whether the current operating frequency is less than a first target operating frequency; judging that the current operating frequency is less than a first target operating frequency, and controlling the operating frequency of the compressor to increase along with time until the final target operating frequency is reached; and judging that the current operating frequency is greater than or equal to the first target operating frequency, and controlling the operating frequency of the compressor to be reduced to reach the final target operating frequency along with time.
In the technical scheme, if the first target operation frequency is less than the current operation frequency, the compressor gradually reduces the frequency along with time and is finally stabilized at the final target operation frequency, namely the first target operation frequency, and if the first target operation frequency is greater than the current operation frequency, the compressor gradually increases the frequency, so that the battery assembly is protected on the basis that the air conditioner can meet the use requirement of a user.
In any of the above technical solutions, further, the method further includes: comparing the magnitude relation between the input voltage at the current sampling moment and the input voltage at the previous sampling moment; detecting that the input voltage at the current sampling moment is less than or equal to the input voltage at the previous sampling moment, and judging whether the input voltage at the current sampling moment is less than or equal to a first input voltage threshold value; and judging that the input voltage at the current sampling moment is less than or equal to a first input voltage threshold, and controlling the maximum input current threshold of the air conditioner to be reduced according to the preset offset to obtain the first input current threshold.
In the technical scheme, the input voltage of the air conditioner is obtained, the first input current threshold is determined according to the input voltage, specifically, the magnitude relation between the input voltage at the current sampling moment and the input voltage at the previous sampling moment is compared, if the input voltage at the current sampling moment is smaller than or equal to the input voltage at the previous sampling moment, the input voltage is in a descending stage, at the moment, the maximum input current threshold of the air conditioner is controlled to be reduced according to the preset offset according to the relation between the input voltage at the current sampling moment and the first input voltage threshold, and the first input current threshold is obtained, so that when the operation frequency is adjusted through the input current, the battery assembly is protected, and the problem of excessive discharge of the battery assembly caused by overlarge air conditioning load when the electric quantity of the battery assembly is low is avoided.
Specifically, the first input voltage threshold includes a plurality of sets of values, the first input voltage threshold may be preset according to an equipment parameter of the air conditioner, and the absolute value of the first input voltage threshold and the preset offset is negative correlation.
In any of the above technical solutions, further, the method further includes: and detecting that the input voltage at the current sampling moment is greater than the input voltage at the previous sampling moment, judging whether the input voltage at the current sampling moment is greater than or equal to a second input voltage threshold value, judging that the input voltage at the current sampling moment is greater than or equal to the second input voltage threshold value, and controlling the maximum input current threshold value to rise according to a preset offset to obtain a first input current threshold value.
In the technical scheme, if the input voltage at the current sampling moment is greater than the input voltage at the previous sampling moment, the operation limit of the air conditioner can be removed when the input voltage is in the rising stage, and at the moment, according to the second input voltage threshold, the maximum input current threshold is controlled to rise according to the preset offset, namely, the first input current threshold is increased, so that the range of the air conditioner capable of adjusting the target operation frequency is expanded.
Specifically, the second input voltage threshold includes a plurality of sets of values, the second input voltage threshold may be preset according to the device parameter of the air conditioner, the absolute value of the second input voltage threshold and the preset offset is positive correlation, and the second input voltage threshold corresponding to the same preset offset is greater than the first input voltage threshold, that is, there is a back difference between the rise and the fall of the input voltage.
In any of the above technical solutions, further, the method further includes: detecting that the input voltage at the current sampling moment is greater than the input voltage at the previous sampling moment, and comparing the magnitude relation between the input voltage at the current sampling moment and a third input voltage threshold value; determining a first input current threshold value according to the magnitude relation; determining a first input current threshold value according to the magnitude relation, specifically comprising: detecting that the input voltage at the current sampling moment is less than or equal to a third input voltage threshold, judging whether the input voltage at the previous sampling moment is less than or equal to a first input voltage threshold, judging that the input voltage at the previous sampling moment is less than or equal to the first input voltage threshold, and controlling the maximum input current threshold to be reduced according to a preset offset; or detecting that the input voltage at the current sampling moment is greater than the third input voltage threshold, judging whether the input voltage at the current sampling moment is greater than or equal to the fourth input voltage threshold, judging that the input voltage at the current sampling moment is greater than or equal to the fourth input voltage threshold, and controlling the maximum input current threshold to rise according to the preset offset.
In the technical scheme, because the line loss voltage is uncertain, no basis is set for the return difference value between the input voltage thresholds, whether the input voltage changes due to the line loss voltage drop or not is judged through a third input voltage threshold, if the input voltage at the current sampling moment is less than or equal to the third input voltage threshold, the upper limit of the input current threshold which is reduced can not be recovered even if the input voltage rises until the input voltage is higher than the third input voltage threshold, namely, whether the input voltage at the current sampling moment is greater than the input voltage at the previous sampling moment or less than the input voltage at the previous sampling moment, the maximum input current threshold is controlled to be reduced according to the preset offset, so that the first input current threshold can be accurately obtained without setting the return difference, and when the running frequency is adjusted through the input current, the battery assembly is protected, the problem of over-discharge of the battery assembly caused by overlarge air-conditioning load when the electric quantity of the battery assembly is low is avoided, and the service life of a product is prolonged; if the input voltage at the current sampling moment is larger than the third input voltage threshold, the maximum input current threshold is controlled to be increased according to the preset offset according to the fourth input voltage threshold so as to increase the first input current threshold, and therefore the range of the air conditioner capable of adjusting the target operation frequency is enlarged.
Specifically, the third input voltage threshold and the fourth input voltage threshold may be preset according to the equipment parameters of the air conditioner, and the fourth input voltage threshold is greater than the third input voltage threshold, and the fourth input voltage threshold includes a plurality of groups of values and is positively correlated to the absolute value of the preset offset.
According to a second aspect of the present invention, a control device for an air conditioner is provided, which includes a memory and a processor, wherein the memory stores a computer program, and the processor implements any one of the above-mentioned control methods when executing the computer program. Therefore, the control device of the air conditioner has all the advantages of the control method of the air conditioner.
According to a third aspect of the present invention, there is provided an air conditioner comprising: the battery pack is suitable for supplying power to the air conditioner through the power supply line; and a control device for the air conditioner, wherein the control device is capable of executing the following steps when executing the computer program: acquiring the current operating frequency of the air conditioner and a first target operating frequency corresponding to the current operating frequency; determining the input current transmitted by the battery assembly to the air conditioner; and adjusting the first target operation frequency according to the input current and the current operation frequency to obtain an adjusted second target operation frequency.
According to the air conditioner provided by the invention, the current operating frequency of the air conditioner and the first target operating frequency corresponding to the current operating frequency are obtained, the input current consumed by the air conditioner when the current operating frequency is executed is determined, and the first target operating frequency is adjusted according to the current operating frequency by taking the input current as an adjusting condition to obtain the adjusted second target operating frequency. On one hand, the target operation frequency of the air conditioner is adjusted through the current, permanent damage to a battery caused by over discharge of the battery assembly due to over large air conditioning load when the battery assembly is low in electric quantity is prevented, the battery assembly can be better protected, and because only the current of an input end and the operation frequency of the air conditioner are used as limiting conditions, a detection line for detecting the output voltage or the current of the battery assembly is not required to be additionally arranged, the cost is reduced, the installation and maintenance steps are simplified, and faults caused by installation errors are reduced; on the other hand, the problem that the battery pack cannot be protected in time due to detection errors when frequency adjustment is carried out according to voltage is avoided, and the application range of the product is widened.
Specifically, the air conditioner is a vehicle-mounted air conditioner or a portable air conditioner powered by a battery, a battery assembly is connected with a load in the air conditioner and supplies power to the load at any time, the load comprises a fan and/or a compressor, for example, an externally-mounted vehicle-mounted air conditioner, the air conditioner is not an original vehicle-mounted air conditioner of a truck, the air conditioner is an air conditioner additionally installed by a truck driver, an outer machine is hung outside a cab, an inner machine is hung inside the cab, but a vehicle-mounted storage battery is adopted for supplying power, and the air conditioner can be started to operate after an engine is.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart illustrating a control method of an air conditioner according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a control method of an air conditioner according to still another embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method of an air conditioner according to still another embodiment of the present invention;
fig. 4 is a flowchart illustrating a control method of an air conditioner according to still another embodiment of the present invention;
fig. 5 is a flowchart illustrating a control method of an air conditioner according to still another embodiment of the present invention;
fig. 6 is a flowchart illustrating a control method of an air conditioner according to still another embodiment of the present invention;
fig. 7 is a flowchart illustrating a method for controlling an air conditioner according to an embodiment of the present invention;
FIG. 8 is a diagram illustrating current limits and frequency intervals for an exemplary embodiment of the present invention;
FIG. 9 is a schematic diagram illustrating input voltage and current limit intervals in accordance with an exemplary embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating another input voltage and current limit interval for an exemplary embodiment of the present invention;
fig. 11 is a schematic block diagram illustrating a control apparatus of an air conditioner according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
A control method of an air conditioner, a control apparatus 800 of an air conditioner according to some embodiments of the present invention will be described below with reference to fig. 1 to 11.
Example one
As shown in fig. 1, according to an embodiment of a first aspect of the present invention, there is provided a control method of an air conditioner including a battery assembly that supplies power to the air conditioner through a power supply line, the control method including:
102, acquiring the current operating frequency of the air conditioner and a first target operating frequency corresponding to the current operating frequency;
and 106, adjusting the first target operation frequency according to the input current and the current operation frequency to obtain an adjusted second target operation frequency.
In this embodiment, the current operating frequency of the air conditioner and a first target operating frequency corresponding to the current operating frequency are obtained, an input current consumed by the air conditioner when the current operating frequency is executed is determined, and the first target operating frequency is adjusted according to the current operating frequency by taking the input current as an adjustment condition, so as to obtain an adjusted second target operating frequency. On one hand, the target operation frequency of the air conditioner is adjusted through the current, permanent damage to a battery caused by over discharge of the battery assembly due to over large air conditioning load when the battery assembly is low in electric quantity is prevented, the battery assembly can be better protected, and because only the current of an input end and the operation frequency of the air conditioner are used as limiting conditions, a detection line for detecting the output voltage or the current of the battery assembly is not required to be additionally arranged, the cost is reduced, the installation and maintenance steps are simplified, and faults caused by installation errors are reduced; on the other hand, the problem that the battery pack cannot be protected in time due to detection errors when frequency adjustment is carried out according to voltage is avoided, and the application range of the product is widened.
Specifically, since the output voltage and the output current determine the output power of the battery pack, that is, the output power of the battery pack = the output voltage of the battery pack × the output current of the battery pack, and the output power of the battery pack must be balanced with the load power, the output power of the battery pack-the boost loss power = the load power, the compressor power, the fan power, and the like are protected by the load power, but the compressor power occupies most of the power, and the compressor load power is proportional to the frequency of the compressor during normal operation of the air conditioner, so that the load power can be adjusted by adjusting the frequency of the compressor, and the output power of the battery pack is changed while the voltage of the battery pack is almost unchanged, so that the output current of the battery pack is changed by adjusting the frequency of the. Therefore, the battery pack to be protected limits the output power of the battery pack, that is, limits the output current of the battery pack, and the output power of the battery pack is naturally balanced with the load power, so that the air conditioner frequency needs to be adjusted by limiting the input current.
Example two
As shown in fig. 2, according to an embodiment of the present invention, there is provided a control method of an air conditioner, the method including:
and 208, determining that the input current is greater than or equal to a first input current threshold value, and adjusting the first target operation frequency according to the preset frequency difference and the current operation frequency.
In this embodiment, the magnitude relationship between the input current and the first input current threshold is compared, if the input current is greater than or equal to the first input current threshold, which indicates that the current value that needs to be consumed currently is too large, the current operating frequency is reduced according to the preset frequency difference, and the reduced current operating frequency is used as the second target operating frequency that can be executed in the current cycle, and if the input current in the next cycle is still greater than or equal to the first input current threshold, the current operating frequency is continuously reduced according to the preset frequency difference until the input current is less than the first input current threshold. Therefore, the target operation frequency of the air conditioner is limited through the first input current threshold and the input current, permanent damage to the battery caused by excessive discharge of the battery assembly due to overlarge air conditioning load when the battery assembly is low in electric quantity is prevented, and the battery assembly can be better protected.
EXAMPLE III
As shown in fig. 3, according to an embodiment of the present invention, there is provided a control method of an air conditioner, the method including:
and step 314, taking the current operating frequency as a second target operating frequency.
In this embodiment, after it is determined that the input current is less than the first input current threshold, the current operating frequency and the target operating frequency are compared, and a smaller value of the current operating frequency and the target operating frequency is selected as the second target operating frequency, so that the battery pack is protected on the basis that the air conditioner can meet the use requirement of a user.
Example four
As shown in fig. 4, according to an embodiment of the present invention, there is provided a control method of an air conditioner, the method including:
and step 410, determining that the input current is smaller than a second input current threshold value, and adjusting the first target operation frequency to be the final target operation frequency of the compressor of the air conditioner according to the magnitude relation between the current operation frequency and the first target operation frequency.
Wherein the first input current threshold is greater than the second input current threshold.
In the embodiment, the magnitude relation between the input current and the first input current threshold is compared, if the input current is greater than or equal to the first input current threshold, it indicates that the current value which needs to be consumed currently is too large, reducing the current operating frequency according to the preset frequency difference, and taking the reduced current operating frequency as a second target operating frequency which can be executed in the current cycle, after the input current is determined to be smaller than the first input current threshold value, the input current is further limited through the second input current threshold value, if the input current is smaller than the second input current threshold value, the fact that the air conditioner cannot be damaged even if the operation frequency reaches the first target operation frequency corresponding to the current operation frequency in the process of the on-demand operation of the air conditioner is shown, the first target operation frequency is used as the final target operation frequency of the compressor to ensure that the air conditioner can meet the use requirement of the user.
Further, adjusting the first target operating frequency to a final target operating frequency of the compressor according to a magnitude relationship between the current operating frequency and the first target operating frequency specifically includes: judging whether the current operating frequency is less than a first target operating frequency; judging that the current operating frequency is less than a first target operating frequency, and controlling the operating frequency of the compressor to increase along with time until the final target operating frequency is reached; and judging that the current operating frequency is greater than or equal to the first target operating frequency, and controlling the operating frequency of the compressor to be reduced to reach the final target operating frequency along with time.
In this embodiment, if the first target operating frequency is less than the current operating frequency, the compressor will gradually reduce the frequency along with time and finally stabilize at the final target operating frequency, that is, the first target operating frequency, and if the first target operating frequency is greater than the current operating frequency, the compressor will gradually increase the frequency, so that the battery assembly is protected on the basis that the air conditioner can meet the use requirement of a user.
Specifically, considering that the line loss voltage is reduced due to the current drop at the frequency modulation, and the input voltage of the air conditioner is increased instead, the frequency and the current repeatedly and rapidly jump, and therefore, the frequency and the current are rapidly jumped according to the first input current threshold value and the pre-input current threshold valueSetting the current return difference to determine a second input current threshold, i.e. IlmtRst=Ilmt-deltaI, wherein IlmtRstRepresenting a first input current threshold, IlmtAnd the delta I represents a second input current threshold value, the delta I represents a preset current return difference, the value range of the delta I is between 0.5A and 2A, and the problem of frequency repeated fluctuation caused by frequency adjustment is prevented through the preset current return difference.
EXAMPLE five
As shown in fig. 5, according to an embodiment of the present invention, there is provided a control method of an air conditioner, the method including:
In the embodiment, the input voltage of the air conditioner is obtained, the first input current threshold is determined according to the input voltage, specifically, the magnitude relation between the input voltage at the current sampling moment and the input voltage at the previous sampling moment is compared, if the input voltage at the current sampling moment is smaller than or equal to the input voltage at the previous sampling moment, the input voltage is in a descending stage, at the moment, the maximum input current threshold of the air conditioner is controlled to be reduced according to a preset offset according to the relation between the input voltage at the current sampling moment and the first input voltage threshold, and the first input current threshold is obtained, so that when the operation frequency is adjusted through the input current, the battery assembly is protected, and the problem of over-discharge of the battery assembly caused by over-large air conditioning load when the electric quantity of the battery assembly is low is avoided; if the input voltage at the current sampling moment is greater than the input voltage at the previous sampling moment, the operation limit of the air conditioner can be removed when the input voltage is in the rising stage, and at the moment, the maximum input current threshold is controlled to rise according to the preset offset according to the second input voltage threshold, namely, the first input current threshold is increased, so that the range of the target operation frequency of the air conditioner is expanded.
Further, as shown in fig. 9, the first input voltage threshold includes a plurality of sets of values, the first input voltage threshold may be preset according to the equipment parameters of the air conditioner, and the first input voltage threshold is negatively correlated with the absolute value of the preset offset, the second input voltage threshold includes a plurality of sets of values, the second input voltage threshold may be preset according to the equipment parameters of the air conditioner, and the second input voltage threshold is positively correlated with the absolute value of the preset offset, and the second input voltage threshold corresponding to the same preset offset is greater than the first input voltage threshold, that is, there is a return difference between the rising and falling of the input voltage.
EXAMPLE six
As shown in fig. 6, according to an embodiment of the present invention, there is provided a control method of an air conditioner, the method including:
In this embodiment, as shown in fig. 10, since the line loss voltage is uncertain, the back difference value between the input voltage thresholds is not set, and therefore, whether the input voltage change is the back rise caused by the line loss voltage drop is determined by using a third input voltage threshold, so that the first input current threshold can be accurately obtained without setting the back difference, and the battery pack is protected when the operating frequency is adjusted by the input current.
Further, detecting that the input voltage at the current sampling moment is less than or equal to a third input voltage threshold, judging whether the input voltage at the previous sampling moment is less than or equal to a first input voltage threshold, judging that the input voltage at the previous sampling moment is less than or equal to the first input voltage threshold, and controlling the maximum input current threshold to be reduced according to a preset offset; or detecting that the input voltage at the current sampling moment is greater than the third input voltage threshold, judging whether the input voltage at the current sampling moment is greater than or equal to the fourth input voltage threshold, judging that the input voltage at the current sampling moment is greater than or equal to the fourth input voltage threshold, and controlling the maximum input current threshold to rise according to the preset offset.
In this embodiment, if the input voltage at the current sampling time is less than or equal to the third input voltage threshold, the upper limit of the input current threshold value which is reduced can not be recovered even if the input voltage rises until the input voltage is higher than the third input voltage threshold value, namely, whether the input voltage at the current sampling moment is larger than the input voltage at the previous sampling moment or smaller than the input voltage at the previous sampling moment, the maximum input current threshold value is controlled to be reduced according to the preset offset, the problem of over-discharge of the battery assembly caused by overlarge air-conditioning load when the electric quantity of the battery assembly is low is avoided, the service life of a product is prolonged, and if the input voltage at the current sampling moment is larger than the third input voltage threshold value, controlling the maximum input current threshold to rise according to the preset offset according to the fourth input voltage threshold, to increase the first input current threshold value and thereby expand the range of the air conditioner adjustment target operating frequency.
Specifically, the third input voltage threshold and the fourth input voltage threshold may be preset according to the equipment parameters of the air conditioner, and the fourth input voltage threshold is greater than the third input voltage threshold, and the fourth input voltage threshold includes a plurality of groups of values and is positively correlated to the absolute value of the preset offset.
EXAMPLE seven
As shown in fig. 7, according to an embodiment of the present invention, there is provided a control method of an air conditioner, including:
In the embodiment, the method of limiting the frequency according to the voltage is abandoned, the method of limiting the current according to the voltage is adopted, and the frequency of the compressor is adjusted by the current limit value, so that the output voltage and the output current determine the output power of the storage battery, namely the output load no matter under any environment or condition, and the protection of the storage battery is more accurate by directly measuring the current because the voltage of the storage battery is almost unchanged. The method comprises the following specific steps:
firstly, according to the current limit IlmtCalculating a predetermined current IlmtRst=Ilmt-deltaI. deltaI represents the return difference of the preset current, the value range is 0.5-2A, and the purpose is to divide a return difference band and prevent the problem of frequency repeated fluctuation caused by frequency adjustment.
Thereafter, as shown in fig. 7 and 8, the actual current I is judgedrealCurrent interval (ARE 1, ARE2, ARE 3):
(1) ARE 1: when the current actual operating frequency F of the compressorrealConsumed current IrealExceeding the current limit IlmtThen, the compressor frequency is reduced according to the law of reducing delta F in each cycle until IrealIs less than IlmtThe down-conversion process repeats this control loop.
(2) ARE 2: when the current actual operating frequency F of the compressorrealConsumed current IrealLess than current limit IlmtIs in time and is greater than a preset current IlmtRstThen (c) is performed. At this time, the actual operating frequency F is judgedrealAnd the original target frequency F of the compressortgtIf the former is smaller than the latter, the final target frequency F of the compressor is determinedfinalSet to the current actual operating frequency Freal(ii) a If the former is greater than or equal to the latter, FfinalSet as the original target frequency FtgtThe compressor will gradually decrease in frequency, and the control loop is repeated during the frequency decreasing process.
(3) ARE 3: when the current actual operating frequency F of the compressorrealConsumed current IrealLess than a predetermined current IlmtRstWhen directly mixing FfinalIs set to Ftgt. At this time, if Ftgt<FrealThen the compressor will gradually decrease in frequency and eventually settle at Ftgt(ii) a If Ftgt≥FrealThe compressor will gradually riseThe frequency up-conversion process repeats this control loop.
Wherein, IlmtIs the current limit value I obtained from voltage division in FIGS. 9 and 10max、Ilmt1、Ilmt2And the like.
Explanation about the relationship between battery power and load power:
battery output power = battery voltage × battery output current.
The output power of the storage battery must be balanced with the load power, and then the storage battery output power-the boost loss power = the load power, and the load power protects the compressor power, the fan power and the like, but the compressor power occupies the vast majority.
The compressor load power is proportional to the frequency of the compressor when the air conditioner is normally operated. Adjusting the compressor frequency therefore adjusts the load power while changing the battery output power, while the battery voltage is nearly constant, so adjusting the compressor frequency changes the battery output current. Returning to the present embodiment, protecting the battery limits the battery output power, and thus the current, and the battery output power is naturally balanced with the load power, requiring the compressor frequency to be adjusted by the limiting current.
Example eight
As shown in fig. 11, according to the second embodiment of the present invention, a control device 800 of an air conditioner is provided, which includes a memory 802 and a processor 804, wherein the memory 802 stores a computer program, and the processor 804 implements the control method of the air conditioner according to any of the above embodiments when executing the computer program. Therefore, the control device 800 of the air conditioner has all the advantages of the control method of the air conditioner according to any one of the embodiments.
Example nine
According to an embodiment of the third aspect of the present invention, there is provided an air conditioner including: the battery pack and the control device of the air conditioner proposed by the second aspect embodiment.
Specifically, the battery pack supplies power to the air conditioner through the power supply line, and the control device can execute the following steps when executing the computer program: acquiring the current operating frequency of the air conditioner and a first target operating frequency corresponding to the current operating frequency; determining the input current transmitted by the battery assembly to the air conditioner; and adjusting the first target operation frequency according to the input current and the current operation frequency to obtain an adjusted second target operation frequency.
The air conditioner provided by this embodiment obtains the current operating frequency of the air conditioner and the first target operating frequency corresponding to the current operating frequency, determines the input current consumed by the air conditioner when executing the current operating frequency, and adjusts the first target operating frequency according to the current operating frequency by using the input current as an adjustment condition, so as to obtain the adjusted second target operating frequency. On one hand, the target operation frequency of the air conditioner is adjusted through the current, permanent damage to a battery caused by over discharge of the battery assembly due to over large air conditioning load when the battery assembly is low in electric quantity is prevented, the battery assembly can be better protected, and because only the current of an input end and the operation frequency of the air conditioner are used as limiting conditions, a detection line for detecting the output voltage or the current of the battery assembly is not required to be additionally arranged, the cost is reduced, the installation and maintenance steps are simplified, and faults caused by installation errors are reduced; on the other hand, the problem that the battery pack cannot be protected in time due to detection errors when frequency adjustment is carried out according to voltage is avoided, and the application range of the product is widened.
Specifically, the air conditioner is a vehicle-mounted air conditioner or a portable air conditioner powered by a battery, a battery assembly is connected with a load in the air conditioner and supplies power to the load at any time, the load comprises a fan and/or a compressor, for example, an externally-mounted vehicle-mounted air conditioner, the air conditioner is not an original vehicle-mounted air conditioner of a truck, the air conditioner is an air conditioner additionally installed by a truck driver, an outer machine is hung outside a cab, an inner machine is hung inside the cab, but a vehicle-mounted storage battery is adopted for supplying power, and the air conditioner can be started to operate after an engine is.
In the description herein, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly stated or limited otherwise; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A control method of an air conditioner including a battery pack that supplies power to the air conditioner through a power supply line, the control method comprising:
acquiring the current operating frequency of the air conditioner and a first target operating frequency corresponding to the current operating frequency;
determining an input current transmitted by the battery assembly to the air conditioner;
adjusting the first target operation frequency according to the input current and the current operation frequency to obtain an adjusted second target operation frequency;
adjusting the first target operating frequency according to the input current and the current operating frequency, specifically including:
comparing the magnitude relationship between the input current and a first input current threshold;
detecting that the input current is greater than or equal to the first input current threshold value, and adjusting the first target operation frequency according to a preset frequency difference and the current operation frequency;
comparing the magnitude relation between the input voltage at the current sampling moment and the input voltage at the previous sampling moment;
detecting that the input voltage at the current sampling moment is greater than the input voltage at the previous sampling moment, and comparing the magnitude relation between the input voltage at the current sampling moment and a third input voltage threshold value;
determining the first input current threshold according to the magnitude relation;
the determining the first input current threshold according to the magnitude relationship specifically includes:
detecting that the input voltage at the current sampling moment is less than or equal to the third input voltage threshold, judging whether the input voltage at the previous sampling moment is less than or equal to the first input voltage threshold,
judging that the input voltage at the previous sampling moment is less than or equal to the first input voltage threshold value, and controlling the maximum input current threshold value of the air conditioner to be reduced according to a preset offset; or
Detecting that the input voltage at the current sampling moment is greater than the third input voltage threshold, judging whether the input voltage at the current sampling moment is greater than or equal to a fourth input voltage threshold,
and judging that the input voltage at the current sampling moment is greater than or equal to the fourth input voltage threshold value, and controlling the maximum input current threshold value to rise according to a preset offset.
2. The method for controlling an air conditioner according to claim 1, wherein the adjusting the first target operating frequency according to the input current and the current operating frequency further includes:
detecting that the input current is less than the first input current threshold, and comparing the magnitude relationship between the current operating frequency and the first target operating frequency;
detecting that the current operating frequency is smaller than the first target operating frequency, and taking the current operating frequency as the second target operating frequency;
and detecting that the current operating frequency is greater than or equal to the first target operating frequency, and taking the first target operating frequency as the second target operating frequency.
3. The method for controlling an air conditioner according to claim 1, wherein the adjusting the first target operating frequency according to the input current and the current operating frequency further includes:
detecting that the input current is smaller than the first input current threshold, and judging whether the input current is smaller than a second input current threshold;
determining that the input current is less than the second input current threshold, adjusting the first target operating frequency to a final target operating frequency of a compressor of the air conditioner according to a magnitude relationship between the current operating frequency and the first target operating frequency,
wherein the first input current threshold is greater than the second input current threshold.
4. The method according to claim 3, wherein the adjusting the first target operating frequency to a final target operating frequency of a compressor of the air conditioner according to a magnitude relationship between the current operating frequency and the first target operating frequency specifically comprises:
judging whether the current operating frequency is less than the first target operating frequency;
determining that the current operating frequency is less than the first target operating frequency, and controlling the operating frequency of the compressor to increase over time until the final target operating frequency is reached;
and judging that the current operating frequency is greater than or equal to the first target operating frequency, and controlling the operating frequency of the compressor to be reduced to reach the final target operating frequency along with time.
5. The control method of an air conditioner according to any one of claims 1 to 4, further comprising:
detecting that the input voltage at the current sampling moment is less than or equal to the input voltage at the previous sampling moment, and judging whether the input voltage at the current sampling moment is less than or equal to a first input voltage threshold value;
and judging that the input voltage at the current sampling moment is less than or equal to the first input voltage threshold, and controlling the maximum input current threshold of the air conditioner to be reduced according to a preset offset to obtain the first input current threshold.
6. The control method of an air conditioner according to claim 5, further comprising:
detecting that the input voltage at the current sampling moment is greater than the input voltage at the previous sampling moment, judging whether the input voltage at the current sampling moment is greater than or equal to a second input voltage threshold value or not,
and judging that the input voltage at the current sampling moment is greater than or equal to the second input voltage threshold, and controlling the maximum input current threshold to rise according to a preset offset to obtain the first input current threshold.
7. A control device for an air conditioner, comprising a memory storing a computer program, and a processor executing the computer program to execute the control method for an air conditioner according to any one of claims 1 to 6.
8. An air conditioner, comprising:
a battery assembly adapted to supply power to the air conditioner; and
the control device of an air conditioner according to claim 7, capable of executing the following steps when the control device executes the computer program:
acquiring the current operating frequency of the air conditioner and a first target operating frequency corresponding to the current operating frequency;
determining an input current transmitted by the battery assembly to the air conditioner;
and adjusting the first target operation frequency according to the input current and the current operation frequency to obtain an adjusted second target operation frequency.
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