CN105783193A - Method and device for controlling initial opening of electronic expansion valve - Google Patents

Abstract

The invention discloses an initial opening control method of an electronic expansion valve, which comprises the following steps: after the air conditioner is electrified and operated, the electronic expansion valve is controlled to be opened at a set opening degree first, then reset and then opened; when the electronic expansion valve is opened again and is opened to a preset first opening degree, maintaining the opening degree of the electronic expansion valve as the first opening degree, and calculating the initial opening degree of the electronic expansion valve under the current environment according to the acquired compressor capacity, the compressor running frequency, the environment temperature and the air conditioner power; and controlling the electronic expansion valve to be opened to the initial opening degree. The invention also discloses an initial opening control device of the electronic expansion valve. The invention realizes that a proper initial opening degree is obtained by self-adaptive calculation according to the running environment of the air conditioner after being electrified so as to be close to the optimal opening degree, thereby leading the air conditioner to achieve the best heat exchange effect more quickly.

Description

Method and device for controlling initial opening of electronic expansion valve

technical field

The invention relates to the field of air conditioners, in particular to a method and device for controlling the initial opening of an electronic expansion valve.

Background technique

In an air conditioner control system that supports electronic expansion valve control, after the electronic expansion valve is started and initialized, the opening of the electronic expansion valve will be set at a predetermined initial opening. At present, the initial opening of the electronic expansion valve is often a preset fixed value. However, the operating environment of the air conditioner is often different after each startup. When the operating environment of the air conditioner is different, the opening of the electronic expansion valve needs to be Adjust according to changes in the operating environment to achieve the optimal opening, so that the air conditioner can achieve the best heat exchange effect, but it takes a period of time to adjust from the preset fixed initial opening to the optimal opening , which will affect the heat exchange effect of the air conditioner. Therefore, it is necessary to propose a scheme that can adaptively determine an appropriate initial opening degree to approach the optimal opening degree according to the operating environment after the air conditioner is started.

Contents of the invention

The invention provides a method and device for controlling the initial opening of an electronic expansion valve, aiming to adaptively determine a suitable initial opening to approach the optimal opening according to the operating environment after the air conditioner is started.

To achieve the above object, the present invention provides a method for controlling the initial opening of an electronic expansion valve, the method for controlling the initial opening of the electronic expansion valve includes:

After the air conditioner is powered on and running, the electronic expansion valve is controlled to open at the set opening degree first, then reset, and then open again;

When the electronic expansion valve is opened again to the preset first opening degree, maintain the opening degree of the electronic expansion valve at the first opening degree, and , ambient temperature, air conditioner power, and calculate the initial opening of the electronic expansion valve in the current environment;

The electronic expansion valve is controlled to open to the initial opening degree.

Preferably, in the heating mode, the ambient temperature includes the outdoor ambient temperature, and according to the acquired compressor capacity, compressor operating frequency, ambient temperature, and air conditioner power, calculate the temperature of the electronic expansion valve in the current environment. The initial opening includes:

calculating the product of the compressor capacity and the operating frequency of the compressor, and rounding the calculated product with the preset first variable to obtain a simple cycle volume;

Determine the value of each coefficient and variable in the preset first formula according to the power of the air conditioner and the outdoor ambient temperature, and combine the simple circulation amount, the outdoor ambient temperature and the preset first opening degree compensation Value, according to the first formula to calculate the stable opening; wherein, the first formula is: stable opening = (first coefficient × simple circulation amount - second variable) × (second coefficient × outdoor ambient temperature + the first Three variables) + first opening compensation value;

When the sum of the calculated stable opening and the preset first range value is greater than or equal to the preset first inflection point, calculate the initial opening according to the preset second formula; otherwise, calculate the initial opening according to the preset The third formula calculates the initial opening; wherein, the second formula is: initial opening = (stable opening + first range value - first inflection point) / first flow ratio + first inflection point, so The third formula is: initial opening=stable opening+first range value, and the first flow ratio is a preset flow ratio in heating mode.

Preferably, in cooling mode, the ambient temperature includes indoor ambient temperature and outdoor ambient temperature, and the electronic expansion valve is calculated according to the obtained compressor capacity, compressor operating frequency, ambient temperature, and air conditioner power. The initial opening in the current environment includes:

calculating the product of the compressor capacity and the operating frequency of the compressor, and rounding the calculated product with the preset first variable to obtain a simple cycle volume;

Determine the value of each coefficient and variable in the preset fourth formula according to the power of the air conditioner and the simple circulation volume, and combine the simple circulation volume, the indoor ambient temperature, the outdoor ambient temperature and the preset The second opening compensation value, according to the fourth formula to calculate the stable opening; wherein, the fourth formula is: stable opening = (third coefficient × simple cycle amount + fourth variable) × (fourth coefficient × (indoor ambient temperature - outdoor ambient temperature) + fifth variable) + second opening compensation value;

When the sum of the calculated stable opening and the preset second range value is greater than or equal to the preset second inflection point, calculate the initial opening according to the preset fifth formula; otherwise, calculate the initial opening according to the preset The sixth formula calculates the initial opening; wherein, the fifth formula is: initial opening = (stable opening + second range value - second inflection point) / second flow ratio + second inflection point, so The sixth formula is: initial opening=stable opening+second range value, and the second flow ratio is a preset flow ratio in cooling mode.

Preferably, the method for controlling the initial opening of the electronic expansion valve further includes:

Obtain the preset minimum and maximum initial openings in cooling mode or heating mode;

judging whether the calculated initial opening is greater than or equal to the minimum initial opening and less than or equal to the maximum initial opening;

When the calculated initial opening is less than the minimum initial opening, use the initial minimum opening as the initial opening; when the calculated initial opening is greater than the initial maximum opening, use The maximum value of the initial opening is used as the initial opening.

Preferably, the method for controlling the initial opening of the electronic expansion valve further includes:

In the heating mode, when the outdoor ambient temperature is lower than the preset extremely low temperature, the minimum value of the initial opening degree is increased to a preset second opening degree, wherein the second opening degree is less than the preset Describe the maximum value of the initial opening.

In order to achieve the above object, the present invention also provides an initial opening control device of the electronic expansion valve, the initial opening control device of the electronic expansion valve includes:

The first control module is used to control the electronic expansion valve to open at the set opening degree first, then reset, and then open again after the air conditioner is powered on; when the electronic expansion valve is opened again to the preset first opening When the opening degree of the electronic expansion valve is maintained at the first opening degree;

A calculation module, configured to calculate the electronic expansion valve according to the acquired compressor capacity, compressor operating frequency, ambient temperature, and air conditioner power when the electronic expansion valve is opened again to a preset first opening degree. The initial opening of the valve in the current environment;

The second control module is used to control the electronic expansion valve to open to the initial opening degree.

Preferably, in the heating mode, the ambient temperature includes outdoor ambient temperature, and the calculation module includes:

The first calculating unit is used to calculate the product of the compressor capacity and the operating frequency of the compressor, and round the calculated product to a preset first variable to obtain a simple cycle volume;

The second calculation unit is used to determine the value of each coefficient and variable in the preset first formula according to the power of the air conditioner and the outdoor ambient temperature, and combine the simple circulation amount, the outdoor ambient temperature and the preset According to the first opening compensation value set, the stable opening is calculated according to the first formula; wherein, the first formula is: stable opening = (first coefficient × simple circulation amount - second variable) × (second coefficient×outdoor ambient temperature+third variable)+first opening compensation value;

The third calculation unit is used to calculate the initial opening according to the preset second formula when the sum of the calculated stable opening and the preset first range value is greater than or equal to the preset first inflection point , otherwise, calculate the initial opening according to the preset third formula; wherein, the second formula is: initial opening = (stable opening + first range value - first inflection point) / first flow ratio + For the first inflection point, the third formula is: initial opening=stable opening+first range value, and the first flow ratio is a preset flow ratio in heating mode.

Preferably, in cooling mode, the ambient temperature includes indoor ambient temperature and outdoor ambient temperature, and the calculation module includes:

The fourth calculating unit is used to calculate the product of the compressor capacity and the operating frequency of the compressor, and round the calculated product with the preset first variable to obtain a simple cycle volume;

The fifth calculation unit is used to determine the value of each coefficient and variable in the preset fourth formula according to the power of the air conditioner and the simple circulation volume, and combine the simple circulation volume, the indoor ambient temperature, and the According to the outdoor ambient temperature and the preset second opening compensation value, the stable opening is calculated according to the fourth formula; wherein, the fourth formula is: stable opening = (third coefficient × simple circulation amount + fourth variable) × (fourth coefficient × (indoor ambient temperature - outdoor ambient temperature) + fifth variable) + second opening compensation value;

The sixth calculation unit is used to calculate the initial opening according to the preset fifth formula when the sum of the calculated stable opening and the preset second range value is greater than or equal to the preset second inflection point , otherwise, calculate the initial opening according to the sixth preset formula; wherein, the fifth formula is: initial opening = (stable opening + second range value - second inflection point) / second flow ratio + For the second inflection point, the sixth formula is: initial opening=stable opening+second range value, and the second flow ratio is a preset flow ratio in cooling mode.

Preferably, the initial opening degree control device of the electronic expansion valve further includes an opening degree limiting module, and the opening degree limiting module includes:

An acquisition unit, configured to acquire the preset minimum and maximum initial openings in cooling mode or heating mode;

a judging unit, configured to judge whether the calculated initial opening is greater than or equal to the minimum initial opening and less than or equal to the maximum initial opening;

An update unit, configured to use the minimum value of the initial opening as the initial opening when the calculated initial opening is smaller than the minimum initial opening; when the calculated initial opening is greater than the initial opening When the maximum value is reached, the maximum value of the initial opening is used as the initial opening.

Preferably, in the heating mode, the opening limit module further includes:

an adjustment unit, configured to increase the minimum value of the initial opening to a preset second opening when the outdoor ambient temperature is lower than a preset extremely low temperature, wherein the second opening is smaller than the The maximum value of the initial opening.

The method and device for controlling the initial opening of the electronic expansion valve proposed by the present invention firstly controls the electronic expansion valve to open at the set opening, then reset, and then open again. When the electronic expansion valve is opened again and opens to the preset At the first opening degree, maintain the opening degree of the electronic expansion valve at the first opening degree, and calculate the electronic expansion valve according to the acquired compressor capacity, compressor operating frequency, ambient temperature, and air conditioner power According to the initial opening degree under the current environment, the electronic expansion valve is controlled to open to the initial opening degree, so that the initial opening degree of the air conditioner is no longer a fixed value, but can be adjusted according to the operating environment after the air conditioner is powered on. An appropriate initial opening degree is adaptively determined, so that the electronic expansion valve can reach an optimal opening degree in a short time, so that the air conditioner can achieve the best heat exchange effect.

Description of drawings

1 is a schematic flow chart of the first embodiment of the method for controlling the initial opening of the electronic expansion valve according to the present invention;

Fig. 2 is a schematic diagram of a detailed flow chart for calculating the initial opening degree in the second embodiment of the method for controlling the initial opening degree of the electronic expansion valve according to the present invention;

Fig. 3 is a schematic diagram of a detailed flow chart for calculating the initial opening degree in the third embodiment of the method for controlling the initial opening degree of the electronic expansion valve according to the present invention;

Fig. 4 is a schematic diagram of a refinement process for limiting the size of the initial opening in the fourth embodiment of the method for controlling the initial opening of the electronic expansion valve according to the present invention;

5 is a schematic diagram of the functional modules of the first embodiment of the initial opening degree control device of the electronic expansion valve of the present invention;

Fig. 6 is a schematic diagram of the detailed functional modules of the calculation module in the second embodiment of the initial opening control device of the electronic expansion valve of the present invention;

Fig. 7 is a schematic diagram of the detailed functional modules of the calculation module in the third embodiment of the initial opening degree control device of the electronic expansion valve of the present invention;

Fig. 8 is a schematic diagram of the detailed functional modules of the opening limit module in the fourth embodiment of the initial opening control device of the electronic expansion valve of the present invention;

Fig. 9 is a schematic diagram of detailed functional modules of the opening degree limiting module in the fifth embodiment of the initial opening degree control device of the electronic expansion valve of the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The present invention provides a method for controlling the initial opening of an electronic expansion valve. As shown in FIG. Opening control methods include:

S10. After the air conditioner is powered on and running, control the electronic expansion valve to open at the set opening degree first, then reset, and then open again;

Wherein, the above step S10 specifically includes:

After the air conditioner is powered on, control the electronic expansion valve to open to the third opening degree; when the electronic expansion valve is opened to the third opening degree, control the electronic expansion valve to close and reset to the fourth opening degree; When the electronic expansion valve is closed and reset to the fourth opening degree, the electronic expansion valve is controlled to open to the first opening degree.

The set opening degree may include one or more opening degree values. In this embodiment, the set opening degree includes the third opening degree, the fourth opening degree, the first opening degree degree, the third opening degree, the fourth opening degree, and the first opening degree are three different opening degree values, which are set by the manufacturer according to the requirements in the factory settings of the air conditioner, for example, In this embodiment, the value of the third opening degree is 248, the value of the fourth opening degree is 520, and the value of the first opening degree is 480, wherein the structure of the electronic expansion valve can support The maximum opening degree is 520, and the maximum opening degree at which the air conditioner can control the opening of the electronic expansion valve is set to 480 degrees.

That is, the above step S10 specifically includes:

After the air conditioner is powered on, control the electronic expansion valve to open to 248 opening degrees; when the electronic expansion valve is opened to 248 opening degrees, control the electronic expansion valve to close and reset to 520 opening degrees; When the valve is closed and reset to 520 degrees of opening, the electronic expansion valve is controlled to open to 480 degrees of opening.

S20. When the electronic expansion valve is opened again to the preset first opening degree, maintain the opening degree of the electronic expansion valve at the first opening degree, and according to the obtained compressor capacity, compressor Operating frequency, ambient temperature, air conditioner power, calculate the initial opening of the electronic expansion valve in the current environment;

When the electronic expansion valve is opened again and opens to 480 degrees, the air conditioner maintains the opening degree of the electronic expansion valve at 480 degrees, and on the other hand, the air conditioner starts to acquire the capacity of the compressor, the The operating frequency of the compressor, the ambient temperature, and the power of the air conditioner are calculated, and the initial opening of the electronic expansion valve in the current environment is calculated according to the acquired values of these parameters.

Wherein, the current environment refers to the operating environment of the air conditioner at this time when the electronic expansion valve is opened again and opened to 480 degrees; the ambient temperature includes indoor ambient temperature and/or outdoor ambient temperature; the compression The machine capacity is a value preset according to the factory setting parameters of the compressor; the compressor operating frequency is the value of the compressor operating frequency calculated by the air conditioner according to the corresponding feedback current in the current environment; the indoor ambient temperature is a temperature value detected by the temperature sensor set on the indoor unit; the outdoor ambient temperature is a temperature value detected by the temperature sensor set on the outdoor unit; the air conditioner power is detected by the air conditioner in the current environment Operating power value.

S30. Control the electronic expansion valve to open to the initial opening degree.

The air conditioner may control the electronic expansion valve to open to the initial opening after the electronic expansion valve is opened again and opens to the preset first opening degree for a preset period of time, or when the initial opening degree is obtained. Spend. Wherein, the preset duration is a preset duration value, such as 1 second, and its value is determined according to actual needs. Generally, the time spent calculating the initial duration is less than the preset duration, and if it appears that the time spent calculating the initial duration is longer than the preset duration, the preset duration can be maintained after the preset duration. The opening degree of the electronic expansion valve is the first opening degree, and the electronic expansion valve is controlled to open to the initial opening degree until the initial opening degree is calculated.

The method for controlling the initial opening of the electronic expansion valve proposed by the present invention firstly controls the electronic expansion valve to open at the set opening first, then reset, and then open again. When the electronic expansion valve is opened again and opens to the preset first When opening, maintain the opening of the electronic expansion valve as the first opening, and calculate the current The initial opening degree under the environment, the electronic expansion valve is controlled to open to the initial opening degree, so that the initial opening degree of the air conditioner is no longer a fixed value, but can be self-adapted according to the operating environment after the air conditioner is powered on An appropriate initial opening degree can be accurately determined, so that the electronic expansion valve can reach the optimal opening degree in a short time, so that the air conditioner can achieve the best heat exchange effect.

Further, based on the first embodiment, the second embodiment of the method for controlling the initial opening of the electronic expansion valve of the present invention is proposed. In this embodiment, referring to FIG. 2 , in the heating mode, the ambient temperature includes the outdoor ambient temperature, The calculation of the initial opening of the electronic expansion valve in the current environment according to the obtained compressor capacity, compressor operating frequency, ambient temperature, and air conditioner power includes:

S21. Calculate the product of the compressor capacity and the operating frequency of the compressor, and round the calculated product with the preset first variable to obtain a simple cycle volume;

The value of the first variable is an appropriate value determined according to a large number of experiments. In this embodiment, the value of the first variable is 100, and the calculation formula of the simple circulation amount can be expressed as:

Simple cycle volume = (compressor operating frequency × compressor capacity)/100

S22. Determine the value of each coefficient and variable in the preset first formula according to the power of the air conditioner and the outdoor ambient temperature, and combine the simple circulation amount, the outdoor ambient temperature and the preset first opening degree compensation value, calculate the stable opening degree according to the first formula;

Wherein, the first formula is: stable opening = (first coefficient x simple circulation amount - second variable) x (second coefficient x outdoor ambient temperature + third variable) + first opening compensation value; The first opening compensation value is a preset opening compensation value of the air conditioner in the heating mode, and the value can be set according to actual needs. In this embodiment, the first opening compensation value is - 12.

The values of the coefficients and variables in the first formula are obtained through a large number of experiments according to the different conditions of the air conditioner power and the outdoor ambient temperature. In this embodiment, the first formula can be determined with reference to Table 1. The value of each coefficient and variable in the formula.

Table 1 The first formula corresponding to different air conditioner powers and different outdoor ambient temperatures

S23. When the sum of the calculated stable opening and the preset first range value is greater than or equal to the preset first inflection point, calculate the initial opening according to the preset second formula; otherwise, calculate the initial opening according to the preset Set the third formula to calculate the initial opening.

Wherein, the second formula is: initial opening = (stable opening + first range value - first inflection point) / first flow ratio + first inflection point

The third formula is: initial opening=stable opening+first range value, and the first flow ratio is a preset flow ratio in heating mode.

The first range value, the first inflection point, and the first flow ratio are all parameters of the air conditioner in heating mode, and a fixed value can be set according to the characteristics of the electronic expansion valve. In this embodiment, the first range value is 150, the first inflection point is 180, and the first flow ratio is 5.0.

Thus, the initial opening degree of the electronic expansion valve can be calculated, and the initial opening degree is also the optimal opening degree of the electronic expansion valve under the current environment, so that the air conditioner can achieve the best heat exchange effect.

The initial opening degree control method of the electronic expansion valve proposed by the present invention, when the air conditioner is in the heating mode, according to the acquired compressor capacity, compressor operating frequency, outdoor ambient temperature, air conditioner power, and the preset calculation formula , the optimal opening degree of the electronic expansion valve in the current environment can be calculated, and the calculation method is simple and less time-consuming.

Further, based on the first embodiment, the third embodiment of the method for controlling the initial opening degree of the electronic expansion valve of the present invention is proposed. In this embodiment, referring to FIG. 3 , in the cooling mode, the ambient temperature includes the indoor ambient temperature and the outdoor temperature. Ambient temperature. According to the acquired compressor capacity, compressor operating frequency, ambient temperature, and air conditioner power, calculating the initial opening degree of the electronic expansion valve under the current environment includes:

S24. Calculate the product of the compressor capacity and the operating frequency of the compressor, and round the calculated product with the preset first variable to obtain a simple cycle volume;

The value of the first variable is an appropriate value determined according to a large number of experiments. In this embodiment, the value of the first variable is 100, and the calculation formula of the simple circulation amount can be expressed as:

Simple cycle volume = (compressor operating frequency × compressor capacity)/100

S25. Determine the value of each coefficient and variable in the preset fourth formula according to the power of the air conditioner and the simple circulation volume, and combine the simple circulation volume, the indoor ambient temperature, the outdoor ambient temperature and The preset second opening compensation value is used to calculate the stable opening according to the fourth formula;

Wherein, the fourth formula is: stable opening = (third coefficient × simple circulation amount + fourth variable) × (fourth coefficient × (indoor ambient temperature - outdoor ambient temperature) + fifth variable) + second opening The second opening compensation value is a preset opening compensation value of the air conditioner in cooling mode, and the value can be set according to actual needs. In this embodiment, the second opening compensation The value takes a value of -50.

The value of each coefficient and variable in the fourth formula is obtained through a large number of experiments according to the different conditions of the air conditioner power and the simple circulation volume. In this embodiment, the first formula can be determined with reference to Table 2. The value of each coefficient and variable in the four formulas.

Table 2 The fourth formula corresponding to different air conditioner powers and different simple circulation volumes

S26. When the sum of the calculated stable opening and the preset second range value is greater than or equal to the preset second inflection point, calculate the initial opening according to the preset fifth formula; otherwise, calculate the initial opening according to the preset Set the sixth formula to calculate the initial opening;

Wherein, the fifth formula is: initial opening = (stable opening + second range value - second inflection point) / second flow ratio + second inflection point

The sixth formula is: initial opening=stable opening+second range value, and the second flow ratio is a preset flow ratio in cooling mode.

The second range value, the second inflection point, and the second flow ratio are all parameters of the air conditioner in cooling mode, and a fixed value can be set according to the characteristics of the electronic expansion valve. In this embodiment, the second range value is 150, the second inflection point is 180, and the second flow ratio is 5.0.

Thus, the initial opening degree of the electronic expansion valve can be calculated, and the initial opening degree is also the optimal opening degree of the electronic expansion valve under the current environment, so that the air conditioner can achieve the best heat exchange effect.

The initial opening degree control method of the electronic expansion valve proposed by the present invention, when the air conditioner is in the cooling mode, according to the obtained compressor capacity, compressor operating frequency, indoor ambient temperature, outdoor ambient temperature, air conditioner power, and preset The calculation formula can calculate the optimal opening degree of the electronic expansion valve in the current environment, and the calculation method is simple and less time-consuming.

Further, based on the second embodiment or the third embodiment, the fourth embodiment of the method for controlling the initial opening degree of the electronic expansion valve of the present invention is proposed. In this embodiment, referring to FIG. 4 , the initial opening degree control method of the electronic expansion valve Methods also include:

S41. Acquiring the preset minimum and maximum initial opening degrees in cooling mode or heating mode;

The minimum value of the initial opening degree and the maximum value of the initial opening degree are values determined according to a large number of experiments of the air conditioner in the cooling mode or the heating mode, so as to avoid the situation where the calculated initial opening is too large or too small Adjustment is made so that the obtained initial opening does not deviate from the actual required optimal opening, avoiding that the air conditioner needs to be adjusted for a long time before the electronic expansion valve can reach the optimal opening.

In this embodiment, when the air conditioner is in the cooling mode, the minimum value of the initial opening can be 240, and the maximum value of the initial opening can be 330; when the air conditioner is in the heating mode, the The minimum value of the initial opening degree may be 120, and the maximum value of the initial opening degree may be 290.

S42. Judging whether the calculated initial opening is greater than or equal to the minimum initial opening and less than or equal to the maximum initial opening;

S43. When the calculated initial opening is smaller than the minimum initial opening, use the initial minimum opening as the initial opening; when the calculated initial opening is greater than the initial maximum opening , taking the maximum value of the initial opening as the initial opening.

When the calculated initial opening is less than the minimum initial opening, it means that the calculated initial opening is too small, at this time, the initial minimum opening can be used as the initial opening; when the calculated When the initial opening degree of is greater than the maximum value of the initial opening degree, it means that the calculated initial opening degree is too large. In this case, the maximum value of the initial opening degree can be used as the initial opening degree.

The initial opening degree control method of the electronic expansion valve proposed by the present invention sets a suitable value range for the calculated initial opening degree, that is, when the calculated initial opening degree is less than the preset initial opening degree minimum value, the The minimum value of the initial opening degree is used as the initial opening degree. When the calculated initial opening degree is greater than the preset initial opening degree maximum value, the initial opening degree maximum value is used as the initial opening degree to ensure that the obtained The initial opening degree will not deviate from the actual required optimal opening degree, avoiding that the air conditioner needs to be adjusted for a long time before the electronic expansion valve reaches the optimal opening degree.

Further, based on the fourth embodiment, a fifth embodiment of the method for controlling the initial opening of the electronic expansion valve of the present invention is proposed. In this embodiment, the method for controlling the initial opening of the electronic expansion valve further includes:

In the heating mode, when the outdoor ambient temperature is lower than the preset extremely low temperature, the minimum value of the initial opening degree is increased to a preset second opening degree, wherein the second opening degree is less than the preset Describe the maximum value of the initial opening.

When the air conditioner is in the heating mode and the currently detected outdoor ambient temperature is too low, such as lower than -15°C, at this time, in order to achieve the specified heating effect faster, the air conditioner will limit the initial The minimum value of the opening degree is not less than the second opening degree. Wherein, the second opening degree is an appropriate value obtained according to a large number of experiments, such as 180 opening degrees; the extremely low temperature is a temperature value set according to actual conditions, such as -15°C.

When the outdoor ambient temperature of the air conditioner in the heating mode is lower than the extremely low temperature, the air conditioner increases the minimum value of the initial opening degree in the heating mode to the second opening degree, and when the calculated When the initial opening degree is smaller than the second opening degree, the value of the second opening degree is used as the value of the initial opening degree.

The initial opening degree control method of the electronic expansion valve proposed by the present invention adjusts the preset initial opening degree minimum value when the outdoor ambient temperature detected when the air conditioner is in the heating mode is lower than the preset extremely low temperature. As high as the specified opening, so that the initial opening of the electronic expansion valve will not be too low to affect the rapid heating effect of the air conditioner.

The present invention also provides an initial opening control device for an electronic expansion valve. As shown in FIG. The initial opening control devices include:

The first control module 100 is used to control the electronic expansion valve to open at the set opening degree, then reset, and open again after the air conditioner is powered on; when the electronic expansion valve is opened again and opened to the preset first When opening, maintain the opening of the electronic expansion valve at the first opening;

Wherein, the first control module 100 is specifically used for:

After the air conditioner is powered on, control the electronic expansion valve to open to the third opening degree; when the electronic expansion valve is opened to the third opening degree, control the electronic expansion valve to close and reset to the fourth opening degree; When the electronic expansion valve is closed and reset to the fourth opening degree, the electronic expansion valve is controlled to open to the first opening degree.

The set opening degree may include one or more opening degree values. In this embodiment, the set opening degree includes the third opening degree, the fourth opening degree, the first opening degree degree, the third opening degree, the fourth opening degree, and the first opening degree are three different opening degree values, which are set by the manufacturer according to the requirements in the factory settings of the air conditioner, for example, In this embodiment, the value of the third opening degree is 248, the value of the fourth opening degree is 520, and the value of the first opening degree is 480, wherein the structure of the electronic expansion valve can support The maximum opening degree is 520, and the maximum opening degree at which the air conditioner can control the opening of the electronic expansion valve is set to 480 degrees.

That is, the first control module 100 is specifically used for:

After the air conditioner is powered on, control the electronic expansion valve to open to 248 opening degrees; when the electronic expansion valve is opened to 248 opening degrees, control the electronic expansion valve to close and reset to 520 opening degrees; When the valve is closed and reset to 520 degrees of opening, the electronic expansion valve is controlled to open to 480 degrees of opening.

The calculation module 200 is used to calculate the electronic expansion valve according to the acquired compressor capacity, compressor operating frequency, ambient temperature, and air conditioner power when the electronic expansion valve is opened again to a preset first opening degree. The initial opening of the expansion valve in the current environment;

When the electronic expansion valve is opened again and opens to 480 degrees, the first control module 100 of the air conditioner maintains the opening degree of the electronic expansion valve at 480 degrees, and at the same time, the calculation module 200 of the air conditioner starts Obtain the compressor capacity, the operating frequency of the compressor, the ambient temperature, and the power of the air conditioner, and calculate the initial opening degree of the electronic expansion valve in the current environment according to the obtained values of these parameters.

Wherein, the current environment refers to the operating environment of the air conditioner at this time when the electronic expansion valve is opened again and opened to 480 degrees; the ambient temperature includes indoor ambient temperature and/or outdoor ambient temperature; the compression The machine capacity is a value preset according to the factory setting parameters of the compressor; the compressor operating frequency is the value of the compressor operating frequency calculated by the air conditioner according to the corresponding feedback current in the current environment; the indoor ambient temperature is a temperature value detected by the temperature sensor set on the indoor unit; the outdoor ambient temperature is a temperature value detected by the temperature sensor set on the outdoor unit; the air conditioner power is detected by the air conditioner in the current environment Operating power value.

The second control module 300 is configured to control the electronic expansion valve to open to the initial opening degree.

The second control module 300 of the air conditioner may control the electronic expansion valve after the electronic expansion valve is opened again and reaches the preset first opening degree for a preset period of time, or when the initial opening degree is obtained. Open to the stated initial opening. Wherein, the preset duration is a preset duration value, such as 1 second, and its value is determined according to actual needs. Generally, the time spent on calculating the initial time is less than the preset time, and if the time spent on calculating the initial time is greater than the preset time, the second control module 300 may Continue to maintain the opening of the electronic expansion valve at the first opening after a set period of time, and control the electronic expansion valve to open to the initial opening until the initial opening is calculated.

The initial opening degree control device of the electronic expansion valve proposed by the present invention firstly controls the electronic expansion valve to open at the set opening degree first, then reset, and then open again. When the electronic expansion valve is opened again and opens to the preset first When opening, maintain the opening of the electronic expansion valve as the first opening, and calculate the current The initial opening degree under the environment, the electronic expansion valve is controlled to open to the initial opening degree, so that the initial opening degree of the air conditioner is no longer a fixed value, but can be self-adapted according to the operating environment after the air conditioner is powered on An appropriate initial opening degree can be accurately determined, so that the electronic expansion valve can reach the optimal opening degree in a short time, so that the air conditioner can achieve the best heat exchange effect.

Further, based on the first embodiment above, the second embodiment of the initial opening control device of the electronic expansion valve of the present invention is proposed. In this embodiment, referring to FIG. 6 , in the heating mode, the ambient temperature includes the outdoor ambient temperature , the computing module 200 includes:

The first calculating unit 201 is used to calculate the product of the compressor capacity and the operating frequency of the compressor, and round the calculated product to a preset first variable to obtain a simple circulation amount;

The value of the first variable is an appropriate value determined according to a large number of experiments. In this embodiment, the value of the first variable is 100, and the calculation formula of the simple circulation amount can be expressed as:

Simple cycle volume = (compressor operating frequency × compressor capacity)/100

The second calculation unit 202 is used to determine the value of each coefficient and variable in the preset first formula according to the power of the air conditioner and the outdoor ambient temperature, and combine the simple circulation amount, the outdoor ambient temperature and The preset first opening compensation value is used to calculate the stable opening according to the first formula;

Wherein, the first formula is: stable opening = (first coefficient x simple circulation amount - second variable) x (second coefficient x outdoor ambient temperature + third variable) + first opening compensation value; The first opening compensation value is a preset opening compensation value of the air conditioner in the heating mode, and the value can be set according to actual needs. In this embodiment, the first opening compensation value is - 12.

The values of the coefficients and variables in the first formula are obtained through a large number of experiments according to the different conditions of the air conditioner power and the outdoor ambient temperature. In this embodiment, the first formula can be determined with reference to Table 1. The value of each coefficient and variable in the formula.

Table 1 The first formula corresponding to different air conditioner powers and different outdoor ambient temperatures

The third calculation unit 203 is used to calculate the initial opening according to the second preset formula when the sum of the calculated stable opening and the preset first range value is greater than or equal to the preset first inflection point. degree, otherwise, calculate the initial opening degree according to the preset third formula;

Wherein, the second formula is: initial opening = (stable opening + first range value - first inflection point) / first flow ratio + first inflection point

The third formula is: initial opening=stable opening+first range value, and the first flow ratio is a preset flow ratio in heating mode.

The first range value, the first inflection point, and the first flow ratio are all parameters of the air conditioner in heating mode, and a fixed value can be set according to the characteristics of the electronic expansion valve. In this embodiment, the first range value is 150, the first inflection point is 180, and the first flow ratio is 5.0.

Thus, the initial opening degree of the electronic expansion valve can be calculated, and the initial opening degree is also the optimal opening degree of the electronic expansion valve under the current environment, so that the air conditioner can achieve the best heat exchange effect.

The initial opening control device of the electronic expansion valve proposed by the present invention, when the air conditioner is in the heating mode, according to the acquired compressor capacity, compressor operating frequency, outdoor ambient temperature, air conditioner power, and the preset calculation formula , the optimal opening degree of the electronic expansion valve in the current environment can be calculated, and the calculation is simple and less time-consuming.

Further, based on the first embodiment above, the third embodiment of the initial opening degree control device of the electronic expansion valve of the present invention is proposed. In this embodiment, referring to FIG. 7 , in cooling mode, the ambient temperature includes indoor ambient temperature and outdoor ambient temperature, the calculation module 200 includes:

The fourth calculating unit 204 is used to calculate the product of the compressor capacity and the operating frequency of the compressor, and round the calculated product with the preset first variable to obtain a simple cycle volume;

The value of the first variable is an appropriate value determined according to a large number of experiments. In this embodiment, the value of the first variable is 100, and the calculation formula of the simple circulation amount can be expressed as:

Simple cycle volume = (compressor operating frequency × compressor capacity)/100

The fifth calculation unit 205 is used to determine the value of each coefficient and variable in the preset fourth formula according to the power of the air conditioner and the simple circulation volume, and combine the simple circulation volume, the indoor ambient temperature, The outdoor ambient temperature and the preset second opening compensation value are used to calculate the stable opening according to the fourth formula;

Wherein, the fourth formula is: stable opening = (third coefficient × simple circulation amount + fourth variable) × (fourth coefficient × (indoor ambient temperature - outdoor ambient temperature) + fifth variable) + second opening The second opening compensation value is a preset opening compensation value of the air conditioner in cooling mode, and the value can be set according to actual needs. In this embodiment, the second opening compensation The value takes a value of -50.

The value of each coefficient and variable in the fourth formula is obtained through a large number of experiments according to the different conditions of the air conditioner power and the simple circulation volume. In this embodiment, the first formula can be determined with reference to Table 2. The value of each coefficient and variable in the four formulas.

Table 2 The fourth formula corresponding to different air conditioner powers and different simple circulation volumes

The sixth calculation unit 206 is used to calculate the initial opening according to the preset fifth formula when the sum of the calculated stable opening and the preset second range value is greater than or equal to the preset second inflection point. Otherwise, calculate the initial opening according to the preset sixth formula;

Wherein, the fifth formula is: initial opening = (stable opening + second range value - second inflection point) / second flow ratio + second inflection point

The sixth formula is: initial opening=stable opening+second range value, and the second flow ratio is a preset flow ratio in cooling mode.

The second range value, the second inflection point, and the second flow ratio are all parameters of the air conditioner in cooling mode, and a fixed value can be set according to the characteristics of the electronic expansion valve. In this embodiment, the second range value is 150, the second inflection point is 180, and the second flow ratio is 5.0.

Thus, the initial opening degree of the electronic expansion valve can be calculated, and the initial opening degree is also the optimal opening degree of the electronic expansion valve under the current environment, so that the air conditioner can achieve the best heat exchange effect.

The initial opening control device of the electronic expansion valve proposed by the present invention, when the air conditioner is in cooling mode, according to the acquired compressor capacity, compressor operating frequency, indoor ambient temperature, outdoor ambient temperature, air conditioner power, and preset The calculation formula can calculate the optimal opening degree of the electronic expansion valve in the current environment, and the calculation is simple and less time-consuming.

Further, based on the second or third embodiment above, the fourth embodiment of the device for controlling the initial opening of the electronic expansion valve of the present invention is proposed. In this embodiment, referring to FIG. 8 , the initial opening of the electronic expansion valve is The control device also includes an opening limit module 400, and the opening limit module 400 includes:

An acquisition unit 401, configured to acquire the preset minimum and maximum initial openings in cooling mode or heating mode;

The minimum value of the initial opening degree and the maximum value of the initial opening degree are values determined according to a large number of experiments of the air conditioner in the cooling mode or the heating mode, so as to avoid the situation where the calculated initial opening is too large or too small Adjustment is made so that the obtained initial opening does not deviate from the actual required optimal opening, avoiding that the air conditioner needs to be adjusted for a long time before the electronic expansion valve can reach the optimal opening.

In this embodiment, when the air conditioner is in the cooling mode, the minimum value of the initial opening can be 240, and the maximum value of the initial opening can be 330; when the air conditioner is in the heating mode, the The minimum value of the initial opening degree may be 120, and the maximum value of the initial opening degree may be 290.

A judging unit 402, configured to judge whether the calculated initial opening is greater than or equal to the minimum initial opening and less than or equal to the maximum initial opening;

An updating unit 403, configured to use the minimum value of the initial opening as the initial opening when the calculated initial opening is smaller than the minimum initial opening; When the maximum opening degree is reached, the initial maximum opening degree is used as the initial opening degree.

When the calculated initial opening is smaller than the minimum initial opening, it means that the calculated initial opening is too small, and at this time, the updating unit 403 uses the minimum initial opening as the initial opening; When the calculated initial opening degree is greater than the initial maximum opening degree, it means that the calculated initial opening degree is too large, and at this time, the updating unit 403 uses the initial opening degree maximum value as the initial opening degree.

The initial opening degree control device of the electronic expansion valve proposed by the present invention sets a suitable value range for the calculated initial opening degree, that is, when the calculated initial opening degree is less than the preset initial opening degree minimum value, the The minimum value of the initial opening degree is used as the initial opening degree. When the calculated initial opening degree is greater than the preset initial opening degree maximum value, the initial opening degree maximum value is used as the initial opening degree to ensure that the obtained The initial opening degree will not deviate from the actual required optimal opening degree, avoiding that the air conditioner needs to be adjusted for a long time before the electronic expansion valve reaches the optimal opening degree.

Further, based on the fourth embodiment above, the fifth embodiment of the initial opening degree control device of the electronic expansion valve of the present invention is proposed. In this embodiment, referring to FIG. 9 , in the heating mode, the opening degree limiting module 400 also include:

The adjustment unit 404 is configured to increase the minimum value of the initial opening degree to a preset second opening degree when the outdoor ambient temperature is lower than a preset extremely low temperature, wherein the second opening degree is smaller than the preset Describe the maximum value of the initial opening.

When the air conditioner is in the heating mode and the currently detected outdoor ambient temperature is too low, such as lower than -15°C, at this time, in order to achieve the specified heating effect faster, the air conditioner will limit the initial The minimum value of the opening degree is not less than the second opening degree. Wherein, the second opening degree is an appropriate value obtained according to a large number of experiments, such as 180 opening degrees; the extremely low temperature is a temperature value set according to actual conditions, such as -15°C.

When the outdoor ambient temperature of the air conditioner in the heating mode is lower than the extremely low temperature, the adjustment unit 404 of the air conditioner increases the minimum value of the initial opening degree in the heating mode to the second opening degree, When the calculated initial opening degree is smaller than the second opening degree, the updating unit 403 uses the value of the second opening degree as the value of the initial opening degree.

The initial opening degree control device of the electronic expansion valve proposed by the present invention adjusts the preset initial opening degree minimum value when the outdoor ambient temperature detected when the air conditioner is in the heating mode is lower than the preset extremely low temperature. As high as the specified opening, so that the initial opening of the electronic expansion valve will not be too low to affect the rapid heating effect of the air conditioner.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (10)

1. the initial opening control method of an electric expansion valve, it is characterised in that the initial opening control method of described electric expansion valve includes:

Air-conditioner powers on after operation, controls electric expansion valve and first opens with the aperture set, resets afterwards, opens；

When described electric expansion valve is again turned on and is opened to the first preset aperture, the aperture maintaining described electric expansion valve is described first aperture, and according to the compressor capacity got, compressor operating frequency, ambient temperature, air-conditioner power, calculate described electric expansion valve initial opening under the present circumstances；

Control described electric expansion valve to open to described initial opening.

2. the initial opening control method of electric expansion valve as claimed in claim 1, it is characterized in that, in a heating mode, described ambient temperature includes outdoor environment temperature, compressor capacity that described basis gets, compressor operating frequency, ambient temperature, air-conditioner power, calculate described electric expansion valve initial opening under the present circumstances and include:

Calculate described compressor capacity and the product of described compressor operating frequency, after calculated product and the first preset variable being rounded, obtain simple and easy circulating load；

The value of each coefficient and variable in the first preset formula is determined according to described air-conditioner power and described outdoor environment temperature, and in conjunction with described simple and easy circulating load, described outdoor environment temperature and the first preset aperture offset, calculate according to described first formula and stablize aperture；Wherein, described first formula is: stablize aperture=(the first coefficient × simple and easy circulating load the-the second variable) × (the second coefficient × outdoor environment temperature the+the ternary)+the first aperture offset；

Calculated described stablize aperture and the first preset value range and during more than or equal to preset first point of inflection, calculate initial opening according to the second preset formula, otherwise, calculate initial opening according to the 3rd preset formula；Wherein, described second formula is: initial opening=(stablizing aperture the+the first value range-the first point of inflection)/first flow ratio+the first point of inflection, described 3rd formula is: initial opening=stablize aperture the+the first value range, described first flow ratio is flow rate ratio preset under heating mode.

3. the initial opening control method of electric expansion valve as claimed in claim 1, it is characterized in that, in cooling mode, described ambient temperature includes indoor environment temperature and outdoor environment temperature, compressor capacity that described basis gets, compressor operating frequency, ambient temperature, air-conditioner power, calculate described electric expansion valve initial opening under the present circumstances and include:

Calculate described compressor capacity and the product of described compressor operating frequency, after calculated product and the first preset variable being rounded, obtain simple and easy circulating load；

The value of each coefficient and variable in the 4th preset formula is determined according to described air-conditioner power and described simple and easy circulating load, and in conjunction with described simple and easy circulating load, described indoor environment temperature, described outdoor environment temperature and the second preset aperture offset, calculate according to described 4th formula and stablize aperture；Wherein, described 4th formula is: stablize aperture=(the 3rd coefficient × simple and easy circulating load the+the four variable) × (Quaternary system number × (indoor environment temperature-outdoor environment temperature) the+the five variable) the+the second aperture offset；

Calculated described stablize aperture and the second preset value range and during more than or equal to preset second point of inflection, calculate initial opening according to the 5th preset formula, otherwise, calculate initial opening according to the 6th preset formula；Wherein, described 5th formula is: initial opening=(stablizing aperture the+the second value range-the second point of inflection)/second flow ratio+the second point of inflection, described 6th formula is: initial opening=stablize aperture the+the second value range, described second flow ratio is flow rate ratio preset under refrigeration mode.

4. the initial opening control method of electric expansion valve as claimed in claim 2 or claim 3, it is characterised in that the initial opening control method of described electric expansion valve also includes:

Obtain under refrigeration mode or preset initial opening minima and initial opening maximum under heating mode；

Judge that whether calculated initial opening is more than or equal to described initial opening minima and less than or equal to described initial opening maximum；

When calculated initial opening is less than described initial opening minima, using described initial opening minima as described initial opening；When calculated initial opening is more than described initial opening maximum, using described initial opening maximum as described initial opening.

5. the initial opening control method of electric expansion valve as claimed in claim 4, it is characterised in that the initial opening control method of described electric expansion valve also includes:

In a heating mode, when described outdoor environment temperature is less than preset extremely low temperature, described initial opening minima being heightened the second preset aperture, wherein, described second aperture is less than described initial opening maximum.

6. the initial opening of an electric expansion valve controls device, it is characterised in that the initial opening of described electric expansion valve controls device and includes:

First controls module, powers on for air-conditioner after running, and controls electric expansion valve and first opens with the aperture set, resets afterwards, opens；When described electric expansion valve is again turned on and is opened to the first preset aperture, the aperture maintaining described electric expansion valve is described first aperture；

Computing module, for when described electric expansion valve is again turned on and is opened to the first preset aperture, according to the compressor capacity got, compressor operating frequency, ambient temperature, air-conditioner power, calculate described electric expansion valve initial opening under the present circumstances；

Second controls module, is used for controlling described electric expansion valve and opens to described initial opening.

7. the initial opening of electric expansion valve as claimed in claim 6 controls device, it is characterised in that in a heating mode, described ambient temperature includes outdoor environment temperature, and described computing module includes:

First computing unit, for calculating described compressor capacity and the product of described compressor operating frequency, obtains simple and easy circulating load after calculated product and the first preset variable being rounded；

Second computing unit, for determining the value of each coefficient and variable in the first preset formula according to described air-conditioner power and described outdoor environment temperature, and in conjunction with described simple and easy circulating load, described outdoor environment temperature and the first preset aperture offset, calculate according to described first formula and stablize aperture；Wherein, described first formula is: stablize aperture=(the first coefficient × simple and easy circulating load the-the second variable) × (the second coefficient × outdoor environment temperature the+the ternary)+the first aperture offset；

3rd computing unit, for calculated described stablize aperture and the first preset value range and during more than or equal to preset first point of inflection, calculate initial opening according to the second preset formula, otherwise, according to the 3rd preset formula calculating initial opening；Wherein, described second formula is: initial opening=(stablizing aperture the+the first value range-the first point of inflection)/first flow ratio+the first point of inflection, described 3rd formula is: initial opening=stablize aperture the+the first value range, described first flow ratio is flow rate ratio preset under heating mode.

8. the initial opening of electric expansion valve as claimed in claim 6 controls device, it is characterised in that in cooling mode, described ambient temperature includes indoor environment temperature and outdoor environment temperature, and described computing module includes:

4th computing unit, for calculating described compressor capacity and the product of described compressor operating frequency, obtains simple and easy circulating load after calculated product and the first preset variable being rounded；

5th computing unit, for determining the value of each coefficient and variable in the 4th preset formula according to described air-conditioner power and described simple and easy circulating load, and in conjunction with described simple and easy circulating load, described indoor environment temperature, described outdoor environment temperature and the second preset aperture offset, calculate according to described 4th formula and stablize aperture；Wherein, described 4th formula is: stablize aperture=(the 3rd coefficient × simple and easy circulating load the+the four variable) × (Quaternary system number × (indoor environment temperature-outdoor environment temperature) the+the five variable) the+the second aperture offset；

6th computing unit, for calculated described stablize aperture and the second preset value range and during more than or equal to preset second point of inflection, calculate initial opening according to the 5th preset formula, otherwise, according to the 6th preset formula calculating initial opening；Wherein, described 5th formula is: initial opening=(stablizing aperture the+the second value range-the second point of inflection)/second flow ratio+the second point of inflection, described 6th formula is: initial opening=stablize aperture the+the second value range, described second flow ratio is flow rate ratio preset under refrigeration mode.

9. the initial opening of electric expansion valve controls device as claimed in claim 7 or 8, it is characterised in that the initial opening of described electric expansion valve controls device and also includes aperture restriction module, and described aperture restriction module includes:

Acquiring unit, is used for obtaining under refrigeration mode or preset initial opening minima and initial opening maximum under heating mode；

Judging unit, is used for judging that whether calculated initial opening is more than or equal to described initial opening minima and less than or equal to described initial opening maximum；

Updating block, for when calculated initial opening is less than described initial opening minima, using described initial opening minima as described initial opening；When calculated initial opening is more than described initial opening maximum, using described initial opening maximum as described initial opening.

10. the initial opening of electric expansion valve as claimed in claim 9 controls device, it is characterised in that in a heating mode, and described aperture restriction module also includes:

Adjustment unit, for when described outdoor environment temperature is less than preset extremely low temperature, described initial opening minima being heightened the second preset aperture, wherein, described second aperture is less than described initial opening maximum.