U.S. patent application number 16/604940 was filed with the patent office on 2020-02-20 for control device and method for outdoor fan of air conditioner.
The applicant listed for this patent is Qingdao Haier Air-Conditioning Electronic Co., Ltd. Invention is credited to Chao Gu, Defang Guo, Gongzeng Yang.
Application Number | 20200056798 16/604940 |
Document ID | / |
Family ID | 59776756 |
Filed Date | 2020-02-20 |
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United States Patent
Application |
20200056798 |
Kind Code |
A1 |
Yang; Gongzeng ; et
al. |
February 20, 2020 |
CONTROL DEVICE AND METHOD FOR OUTDOOR FAN OF AIR CONDITIONER
Abstract
The present disclosure discloses a control device for an outdoor
fan of an air conditioner. The device includes: an outdoor
environment temperature detection unit configured to detect an
outdoor environment temperature; a first temperature detection unit
and a second temperature detection unit configured to detect an
outdoor condenser coil temperature; a calculation unit configured
to calculate a target rotational speed of the outdoor fan according
to the outdoor environment temperature and the outdoor condenser
coil temperature; and a control unit configured to control the
outdoor fan to operate at the target rotational speed. The present
disclosure further discloses a control method for an outdoor fan of
an air conditioner.
Inventors: |
Yang; Gongzeng; (Shandong,
CN) ; Gu; Chao; (Shandong, CN) ; Guo;
Defang; (Shandong, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Qingdao Haier Air-Conditioning Electronic Co., Ltd |
Shandong |
|
CN |
|
|
Family ID: |
59776756 |
Appl. No.: |
16/604940 |
Filed: |
April 9, 2018 |
PCT Filed: |
April 9, 2018 |
PCT NO: |
PCT/CN2018/082318 |
371 Date: |
October 11, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F24F 2140/20 20180101;
F24F 11/30 20180101; F24F 11/77 20180101; F24F 1/16 20130101; F24F
11/64 20180101; F24F 2110/12 20180101 |
International
Class: |
F24F 11/30 20060101
F24F011/30; F24F 11/64 20060101 F24F011/64 |
Foreign Application Data
Date |
Code |
Application Number |
May 5, 2017 |
CN |
201710312578.4 |
Claims
1. A control device for an outdoor fan of an air conditioner,
comprising: an outdoor environment temperature detection unit
configured to detect an outdoor environment temperature; a first
temperature detection unit and a second temperature detection unit
configured to detect an outdoor condenser coil temperature; a
calculation unit configured to calculate a target rotational speed
of the outdoor fan according to the outdoor environment temperature
and the outdoor condenser coil temperature; and a control unit
configured to control the outdoor fan to operate at the target
rotational speed.
2. The device according to claim 1, wherein the calculation unit
calculates the target rotational speed of the outdoor fan according
to the following formula: n = N * ( Ta 0 + 273.15 ) * ( Tp 0 - Ta 0
) * ( 273.15 + Tp 0 ) ( Tp - Ta ) * ( 273.15 + Tp ) * ( 273.15 + Ta
) ##EQU00007## wherein n is the target rotational speed of the
outdoor fan, N is a rated maximum rotational speed when the outdoor
fan operates at full speed, Tp0 is an outdoor condenser coil
temperature preset by the air conditioner, Ta0 is an outdoor
environment temperature preset by the air conditioner, Tp is the
outdoor condenser coil temperature, and Ta is the outdoor
environment temperature.
3. The device according to claim 1, wherein the outdoor condenser
coil temperature is a higher one of outdoor condenser coil
temperatures detected by the first temperature detection unit and
the second temperature detection unit.
4. The device according to claim 1, wherein the control unit is
further configured to control the outdoor fan to operate at a first
rotational speed within a first set time after startup.
5. A control method for an outdoor fan of an air conditioner,
comprising: when it is detected that an outdoor environment
temperature is less than a first set temperature, controlling the
outdoor fan to operate at a target rotational speed of the outdoor
fan determined according to the outdoor environment temperature and
an outdoor condenser coil temperature detected by a first
temperature detection unit and a second temperature detection unit
within a second set time; and when it is detected that an absolute
value of a difference between the outdoor condenser coil
temperature and a preset outdoor condenser coil temperature is
greater than a second set temperature, controlling the outdoor fan
to operate at a target rotational speed of the outdoor fan
determined according to a latest read outdoor environment
temperature and the outdoor condenser coil temperature detected by
the first temperature detection unit and the second temperature
detection unit within the second set time.
6. The method according to claim 5, wherein the controlling the
outdoor fan to operate at a target rotational speed of the outdoor
fan determined according to the outdoor environment temperature and
an outdoor condenser coil temperature detected by a first
temperature detection unit and a second temperature detection unit
within a second set time comprises: calculating the target
rotational speed of the outdoor fan according to the following
formula: n = N * ( Ta 0 + 273.15 ) * ( Tp 0 - Ta 0 ) * ( 273.15 +
Tp 0 ) ( Tp - Ta ) * ( 273.15 + Tp ) * ( 273.15 + Ta ) ##EQU00008##
wherein n is the target rotational speed of the outdoor fan, N is a
rated maximum rotational speed when the outdoor fan operates at
full speed, Tp0 is an outdoor condenser coil temperature preset by
the air conditioner, Ta0 is an outdoor environment temperature
preset by the air conditioner, Tp is the outdoor condenser coil
temperature, and Ta is the outdoor environment temperature; and
controlling the outdoor fan to operate at the target rotational
speed within the second set time.
7. The method according to claim 5, wherein the outdoor condenser
coil temperature is a higher one of outdoor condenser coil
temperatures detected by the first temperature detection unit and
the second temperature detection unit.
8. The method according to claim 6, further comprising: reading the
outdoor environment temperature and the outdoor condenser coil
temperature once every second set time, and ending after reading
six groups of data; and calculating an average value of the outdoor
environment temperature and an average value of the outdoor
condenser coil temperature.
9. The method according to claim 5, further comprising: controlling
the outdoor fan to operate at a first rotational speed within a
first set time after startup.
10. The device according to claim 2, wherein the outdoor condenser
coil temperature is a higher one of outdoor condenser coil
temperatures detected by the first temperature detection unit and
the second temperature detection unit.
11. The method according to claim 6, wherein the outdoor condenser
coil temperature is a higher one of outdoor condenser coil
temperatures detected by the first temperature detection unit and
the second temperature detection unit.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The application is based upon and claims priority to Chinese
Patent Application No. 201710312578.4, filed May 5, 2017, the
entire contents of which are incorporated herein by reference.
TECHNICAL FIELD
[0002] The present disclosure relates to the field of air
conditioner technologies, and more particularly, to a control
device and method for an outdoor fan of an air conditioner.
BACKGROUND
[0003] Chinese Patent Application No. 201310100919.3, entitled
"CONTROL CIRCUIT AND CONTROL METHOD FOR AN OUTDOOR FAN OF AIR
CONDITIONER AND AIR CONDITIONER", discloses a control method for an
outdoor fan. In this solution, an outdoor condenser coil
temperature is obtained by a condenser coil temperature detection
unit when the outdoor fan operates, and the outdoor condenser coil
temperature is compared with a preset reference temperature to
determine a wind speed of the outdoor fan.
[0004] In the solution, a data collection point is single and a
control manner is single. When the unique temperature detection
unit fails, there is a potential risk that an operation of the air
conditioner cannot be controlled.
SUMMARY
[0005] Embodiments of the present disclosure provide a control
device and method for an outdoor fan of an air conditioner, and are
intended to solve problems that the data collection point is
single, the control manner is single, and the operation of the air
conditioner cannot be controlled when the unique temperature
detection unit fails in prior solutions. The following briefly
describes the embodiments of the present disclosure in order to
provide a basic understanding of some aspects of the present
disclosure. This brief description is not intended as an extensive
overview. It is not intended to identify key or critical elements,
or to delineate a scope of protection of these embodiments. Its
purpose is merely to present some concepts in a simplified form as
a prelude to the more detailed description that is presented
later.
[0006] According to a first aspect of the embodiments of the
present disclosure, there is provided a control device for an
outdoor fan of an air conditioner, including: an outdoor
environment temperature detection unit configured to detect an
outdoor environment temperature; a first temperature detection unit
and a second temperature detection unit configured to detect an
outdoor condenser coil temperature; a calculation unit configured
to calculate a target rotational speed of the outdoor fan according
to the outdoor environment temperature and the outdoor condenser
coil temperature; and a control unit configured to control the
outdoor fan to operate at the target rotational speed.
[0007] Optionally, the calculation unit calculates the target
rotational speed of the outdoor fan according to the following
formula:
n = N * ( Ta 0 + 273.15 ) * ( Tp 0 - Ta 0 ) * ( 273.15 + Tp 0 ) (
Tp - Ta ) * ( 273.15 + Tp ) * ( 273.15 + Ta ) ##EQU00001##
[0008] wherein n is the target rotational speed of the outdoor fan,
N is a rated maximum rotational speed when the outdoor fan operates
at full speed, Tp0 is an outdoor condenser coil temperature preset
by the air conditioner, Ta0 is an outdoor environment temperature
preset by the air conditioner, Tp is the outdoor condenser coil
temperature, and Ta is the outdoor environment temperature.
[0009] Optionally, the outdoor condenser coil temperature is a
higher one of outdoor condenser coil temperatures detected by the
first temperature detection unit and the second temperature
detection unit.
[0010] Optionally, the control unit is further configured to
control the outdoor fan to operate at a first rotational speed
within a first set time after startup.
[0011] According to a second aspect of the embodiments of the
present disclosure, there is provided a control method for an
outdoor fan of an air conditioner, including: when it is detected
that an outdoor environment temperature is less than a first set
temperature, controlling the outdoor fan to operate at a target
rotational speed of the outdoor fan determined according to the
outdoor environment temperature and an outdoor condenser coil
temperature detected by a first temperature detection unit and a
second temperature detection unit within a second set time; and
when it is detected that an absolute value of a difference between
the outdoor condenser coil temperature and a preset outdoor
condenser coil temperature is greater than a second set
temperature, controlling the outdoor fan to operate at a target
rotational speed of the outdoor fan determined according to a
latest read outdoor environment temperature and the outdoor
condenser coil temperature detected by the first temperature
detection unit and the second temperature detection unit within the
second set time.
[0012] Optionally, the controlling the outdoor fan to operate at a
target rotational speed of the outdoor fan determined according to
the outdoor environment temperature and an outdoor condenser coil
temperature detected by a first temperature detection unit and a
second temperature detection unit within a second set time
includes: calculating the target rotational speed of the outdoor
fan according to the following formula:
n = N * ( Ta 0 + 273.15 ) * ( Tp 0 - Ta 0 ) * ( 273.15 + Tp 0 ) (
Tp - Ta ) * ( 273.15 + Tp ) * ( 273.15 + Ta ) ##EQU00002##
[0013] wherein n is the target rotational speed of the outdoor fan,
N is a rated maximum rotational speed when the outdoor fan operates
at full speed, Tp0 is an outdoor condenser coil temperature preset
by the air conditioner, Ta0 is an outdoor environment temperature
preset by the air conditioner, Tp is the outdoor condenser coil
temperature, and Ta is the outdoor environment temperature; and
controlling the outdoor fan to operate at the target rotational
speed within the second set time.
[0014] Optionally, the outdoor condenser coil temperature is a
higher one of outdoor condenser coil temperatures detected by the
first temperature detection unit and the second temperature
detection unit.
[0015] Optionally, the method further includes: reading the outdoor
environment temperature and the outdoor condenser coil temperature
once every second set time, and ending after reading six groups of
data; and calculating an average value of the outdoor environment
temperature and an average value of the outdoor condenser coil
temperature.
[0016] Optionally, the method further includes: controlling the
outdoor fan to operate at a first rotational speed within a first
set time after startup.
[0017] The technical solution provided by the embodiments of the
present disclosure has the following beneficial effects:
[0018] the target rotational speed of the outdoor fan is determined
by the detected outdoor environment temperature and the outdoor
condenser coil temperature, thereby realizing a multi-unit control
of the outdoor fan of the air conditioner; since an outdoor
condenser is provided with two temperature detection units,
sampling points of the outdoor condenser coil temperature are
increased, and a potential risk that the operation of the air
conditioner cannot be controlled due to a damage of a single
detection unit is avoided.
[0019] It should be understood that both the foregoing general
description and the following detailed description are exemplary
and explanatory only and are not intended to limit the present
disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The accompanying drawings, which are incorporated in and
constitute a part of this description, illustrate embodiments
consistent with the present disclosure and, together with the
description, serve to explain the principles of the present
disclosure.
[0021] FIG. 1 is a block diagram illustrating a control device for
an outdoor fan of an air conditioner according to an exemplary
embodiment.
[0022] FIG. 2 is a flowchart illustrating a control method for an
outdoor fan of an air conditioner according to an exemplary
embodiment.
[0023] FIG. 3 is a flowchart illustrating a control method for an
outdoor fan of an air conditioner according to an exemplary
embodiment.
[0024] FIG. 4 is a flowchart illustrating a method for determining
a target rotational speed of an outdoor fan according to an
exemplary embodiment.
DETAILED DESCRIPTION
[0025] The following description and accompanying drawings fully
illustrate the specific implementation solutions of the present
disclosure so that a person skilled in the art can practice them.
The embodiments merely represent possible changes. Unless otherwise
specified explicitly, the individual component and function are
optional and the operation sequence may be changed. Parts and
characteristics of some implementation solutions may be included in
or replace parts and characteristics of other implementation
solutions. The scope of the implementation solutions of the present
disclosure includes the whole scope of the claims and all available
equivalents of the claims. As used herein, each implementation
solution may be independently or generally expressed by "present
disclosure", which is merely for convenience. As a matter of fact,
if more than one disclosure is disclosed, it does not mean that the
scope of the application is automatically limited to any single
disclosure or disclosure concept. As used herein, terms such as
"first" and "second" are merely for distinguishing one entity or
operation from another entity or operation and do not require or
imply any actual relationship or sequence among these entities or
operations. Moreover, terms such as "comprise" and "include" or any
other variants indicate a non-exclusive inclusion, so that a
process, method or device including a series of elements not only
include these elements, but also include other elements not
explicitly listed. Without further restrictions, the element
defined by the statement "includes a/an . . . " does not exclude
the existence of other identical elements in the process, method or
device that includes the element. As used herein, each embodiment
is described progressively, and contents focally described in each
embodiment are different from those in other embodiments. The same
or similar parts among each of the embodiments may be referred to
each other. Regarding a structure, a product and the like disclosed
in the embodiments, since they are corresponding to parts disclosed
in the embodiments, their description is relatively simple and
relevant contents can be referred to the description in the method
part.
[0026] FIG. 1 is a schematic structural diagram illustrating a
control device for an outdoor fan of an air conditioner according
to an embodiment of the present disclosure. As shown in FIG. 1, the
device includes: an outdoor environment temperature detection unit
101, a first temperature detection unit 102, a second temperature
detection unit 103, a calculation unit 104 and a control unit
105.
[0027] The outdoor environment temperature detection unit 101 is
configured to detect an outdoor environment temperature.
[0028] The first temperature detection unit 102 and the second
temperature detection unit 103 are disposed at different positions
on a surface of an outdoor condenser, and both of which are
configured to detect a temperature of the outdoor condenser. Since
the sampling points of the outdoor condenser coil temperature are
increased, a potential risk that the operation of the air
conditioner cannot be controlled due to the failure of a single
temperature detection unit is avoided. In this embodiment, the
first temperature detection unit 102 and the second temperature
detection unit 103 are respectively disposed at upper and lower
positions of the condenser. In some embodiments, the first
temperature detection unit 102 and the second temperature detection
unit 103 are respectively disposed at left and right sides of the
condenser. In other embodiments, the first temperature detection
unit 102 and the second temperature detection unit 103 are
respectively disposed at the upper position and the left side.
[0029] The calculation unit 104 is configured to calculate a target
rotational speed of the outdoor fan according to the outdoor
environment temperature detected by the outdoor temperature
detection unit 101 and the outdoor condenser coil temperature
detected by the first temperature detection unit 102 and the second
temperature detection unit 103.
[0030] The control unit 105 is configured to control the outdoor
fan to operate at the target rotational speed of the outdoor fan
calculated by the calculation unit 104.
[0031] According to the device provided by the present embodiment,
the target rotational speed of the outdoor fan is determined by the
detected outdoor environment temperature and the outdoor condenser
coil temperature, thereby realizing a multi-unit control of the
outdoor fan of the air conditioner; since an outdoor condenser is
provided with two temperature detection units, sampling points of
the outdoor condenser coil temperature are increased, and a
potential risk that the operation of the air conditioner cannot be
controlled due to a damage of a single detection unit is
avoided.
[0032] In other embodiments, the control device for the outdoor fan
of the air conditioner includes: an outdoor environment temperature
detection unit 101, a first temperature detection unit 102, a
second temperature detection unit 103, a calculation unit 104 and a
control unit 105.
[0033] The outdoor environment temperature detection unit 101 is
configured to detect an outdoor environment temperature.
[0034] The first temperature detection unit 102 and the second
temperature detection unit 103 are disposed at different positions
on a surface of the outdoor condenser, and both of which are
configured to detect a temperature of the outdoor condenser.
[0035] The calculation unit 104 is configured to calculate a target
rotational speed of the outdoor fan according to the following
formula:
n = N * ( Ta 0 + 273.15 ) * ( Tp 0 - Ta 0 ) * ( 273.15 + Tp 0 ) (
Tp - Ta ) * ( 273.15 + Tp ) * ( 273.15 + Ta ) ##EQU00003##
[0036] wherein n is the target rotational speed of the outdoor fan,
N is a rated maximum rotational speed when the outdoor fan operates
at full speed, Tp0 is an outdoor condenser coil temperature preset
by the air conditioner, Ta0 is an outdoor environment temperature
preset by the air conditioner, Tp is the outdoor condenser coil
temperature, Ta is the outdoor environment temperature, 273.15 is
the lowest temperature of thermodynamics, and the unit of
thermodynamic temperature scale is Kelvin.
[0037] The outdoor condenser coil temperature is a higher one of
outdoor condenser temperatures detected by the first temperature
detection unit 102 and the second temperature detection unit
103.
[0038] The control unit 105 is configured to control the outdoor
fan to operate at the target rotational speed of the outdoor fan
calculated by the calculation unit 104. The control unit 105 is
further configured to control the outdoor fan to operate at a first
rotational speed within a first set time after startup. The first
set time has a range of 1 to 5 minutes. In this embodiment, the
first set time is 2 minutes. Before controlling the rotational
speed of the outdoor fan according to the outdoor condenser coil
temperature and the outdoor environment temperature, the outdoor
fan operates for 2 minutes, so that the temperature of the outdoor
condenser tends to be stable and convenient to control. The first
rotational speed is the rated maximum rotational speed when the
outdoor fan operates at full speed, which ensures that the outdoor
fan operates smoothly after startup; in addition, an excessive
current of the outdoor fan will damage a motor when startup at a
low rotational speed.
[0039] According to the device provided by the present embodiment,
the target rotational speed of the outdoor fan is determined by the
detected outdoor environment temperature and the outdoor condenser
coil temperature, thereby realizing a multi-unit control of the
outdoor fan of the air conditioner; since an outdoor condenser is
provided with two temperature detection units, sampling points of
the outdoor condenser coil temperature are increased, and a
potential risk that the operation of the air conditioner cannot be
controlled due to a damage of a single detection unit is
avoided.
[0040] In other embodiments, the calculating, by the calculation
unit 104, the target rotational speed of the outdoor fan according
to the outdoor environment temperature and the outdoor condenser
coil temperature includes the following steps. Firstly, the outdoor
environment temperature and the outdoor condenser coil temperature
are collected, the outdoor environment temperature and the outdoor
condenser coil temperature are read once every third set time, and
the step ends after reading six groups of data. The third set time
is 30 seconds, and the temperature is read once every 30 seconds,
thereby improving the efficiency of controlling the rotational
speed of the outdoor fan while increasing the number of samples.
The outdoor environment temperature is detected by the outdoor
environment temperature detection unit 101, and the outdoor
condenser coil temperature is detected by the first temperature
detection unit 102 and the second temperature detection unit 103. A
higher one of temperatures detected by the first temperature
detection unit 102 and the second temperature detection unit 103 in
each of the six groups of data is taken as the outdoor condenser
coil temperature. After collecting the outdoor environment
temperature and the outdoor condenser coil temperature, an average
value of the outdoor environment temperature and an average value
of the outdoor condenser coil temperature are calculated, and the
target rotational speed of the outdoor fan is calculated according
to the following formula based on the average value of the outdoor
environment temperature and the average value of the outdoor
condenser coil temperature:
n = N * ( Ta 0 + 273.15 ) * ( Tp 0 - Ta 0 ) * ( 273.15 + Tp 0 ) (
Tp - Ta ) * ( 273.15 + Tp ) * ( 273.15 + Ta ) ##EQU00004##
[0041] wherein n is the target rotational speed of the outdoor fan,
N is a rated maximum rotational speed when the outdoor fan operates
at full speed, Tp0 is an outdoor condenser coil temperature preset
by the air conditioner, Ta0 is an outdoor environment temperature
preset by the air conditioner, Tp is the outdoor condenser coil
temperature, Ta is the outdoor environment temperature, 273.15 is
the lowest temperature of thermodynamics, and the unit of
thermodynamic temperature scale is Kelvin.
[0042] FIG. 2 is a schematic diagram illustrating a control method
for an outdoor fan of an air conditioner according to an embodiment
of the present disclosure. As shown in FIG. 2, the method includes
the following steps.
[0043] Step S201, when it is detected that an outdoor environment
temperature is less than a first set temperature, the outdoor fan
is controlled to operate at a target rotational speed of the
outdoor fan determined according to the outdoor environment
temperature and an outdoor condenser coil temperature detected by a
first temperature detection unit and a second temperature detection
unit within a second set time.
[0044] When it is detected that the outdoor environment temperature
is less than the first set temperature, the calculation unit
calculates and determines the target rotational speed of the
outdoor fan according to the outdoor environment temperature
detected by an outdoor environment temperature detection unit and
the outdoor condenser coil temperature detected by the first
temperature detection unit and the second temperature detection
unit, and the control unit controls the outdoor fan to operate at
the target rotational speed within the second set time. The first
set temperature is determined according to an average value of an
environment temperature of an air conditioner installation
environment, and in this embodiment, the first set temperature is
35. The second set time has a range of 3 to 10 minutes, and in this
embodiment, the second set time is 5 minutes. In a third set time,
the outdoor fan operates stably at a currently calculated target
temperature. When the outdoor fan operates stably at the currently
calculated target temperature for the second set time, it is
determined whether the rotational speed of the outdoor fan needs to
be adjusted, thereby ensuring stable and effective operation of the
air conditioner, and avoiding frequent adjustment of the outdoor
fan.
[0045] Step S202, when it is detected that an absolute value of a
difference between the outdoor condenser coil temperature and a
preset outdoor condenser coil temperature is greater than a second
set temperature, the outdoor fan is controlled to operate at a
target rotational speed of the outdoor fan determined according to
a latest read outdoor environment temperature and the outdoor
condenser coil temperature detected by the first temperature
detection unit and the second temperature detection unit within the
second set time.
[0046] The air conditioner is preset with an outdoor condenser coil
temperature. The outdoor fan operates stably at the currently
calculated target temperature for the second set time. When the
absolute value of the difference between the detected outdoor
condenser coil temperature and the preset outdoor condenser coil
temperature is less than or equal to the second set temperature,
the outdoor fan operates stably at the currently calculated target
temperature; when the absolute value of the difference between the
detected outdoor condenser coil temperature and the preset outdoor
condense coil temperature is greater than the second set
temperature, the calculation unit calculates and determines the
target rotational speed of the outdoor fan again according to the
outdoor environment temperature detected by the outdoor environment
temperature detection unit and the outdoor condenser coil
temperature detected by the first temperature detection unit and
the second temperature detection unit in the state, and the control
unit controls the outdoor fan to operate at the latest calculated
target rotational speed within the second set time.
[0047] According to the method provided by the present embodiment,
the control unit controls the outdoor fan to operate at the target
rotational speed of the outdoor fan determined by the detected
outdoor environment temperature and the outdoor condenser coil
temperature, thereby realizing a multi-unit control of the outdoor
fan of the air conditioner; since an outdoor condenser is provided
with two temperature detection units, sampling points of the
outdoor condenser coil temperature are increased, and a potential
risk that the operation of the air conditioner cannot be controlled
due to a damage of a single detection unit is avoided.
[0048] FIG. 3 is a schematic diagram illustrating a control method
for an outdoor fan of an air conditioner according to an embodiment
of the present disclosure. As shown in FIG. 3, the method includes
the following steps.
[0049] Step S301, the outdoor fan is controlled to operate at a
first rotational speed within a first set time after startup.
[0050] A control unit controls the outdoor fan to operate at the
first rotational speed within the first set time after startup. The
first set time has a range of 1 to 5 minutes. In this embodiment,
the first set time is 2 minutes. Before controlling the rotational
speed of the outdoor fan according to an outdoor condenser coil
temperature and an outdoor environment temperature, the outdoor fan
operates for 2 minutes, so that the temperature of the outdoor
condenser tends to be stable and convenient to control. The first
rotational speed is a rated maximum rotational speed when the
outdoor fan operates at full speed, which ensures that the outdoor
fan operates smoothly after startup; in addition, an excessive
current of the outdoor fan will damage a motor when startup at a
low rotational speed.
[0051] Step S302, when it is detected that the outdoor environment
temperature is less than a first set temperature, the outdoor fan
is controlled to operate at a target rotational speed of the
outdoor fan determined according to the outdoor environment
temperature and the outdoor condenser coil temperature detected by
a first temperature detection unit and a second temperature
detection unit within a third set time.
[0052] When the outdoor fan operates for the first set time of 2
minutes and it is detected that the outdoor environment temperature
is greater than or equal to the first set temperature, the outdoor
fan continues to operate at the current first rotational speed;
when it is detected that the outdoor environment temperature is
less than the first set temperature, a calculation unit calculates
and determines the target rotational speed of the outdoor fan
according to the outdoor environment temperature detected by an
outdoor environment temperature detection unit and the outdoor
condenser coil temperature detected by the first temperature
detection unit and the second temperature detection unit, and the
calculation formula is as follows:
n = N * ( Ta 0 + 273.15 ) * ( Tp 0 - Ta 0 ) * ( 273.15 + Tp 0 ) (
Tp - Ta ) * ( 273.15 + Tp ) * ( 273.15 + Ta ) ##EQU00005##
[0053] wherein n is the target rotational speed of the outdoor fan,
N is a rated maximum rotational speed when the outdoor fan operates
at full speed, Tp0 is an outdoor condenser coil temperature preset
by the air conditioner, Ta0 is an outdoor environment temperature
preset by the air conditioner, Tp is the outdoor condenser coil
temperature, Ta is the outdoor environment temperature, 273.15 is
the lowest temperature of thermodynamics, and the unit of
thermodynamic temperature scale is Kelvin. The outdoor condenser
coil temperature is a higher one of outdoor condenser temperatures
detected by the first temperature detection unit and the second
temperature detection unit. The control unit controls the outdoor
fan to operate at the target rotational speed within a second set
time.
[0054] Step S303, when it is detected that an absolute value of a
difference between the outdoor condenser coil temperature and the
preset outdoor condenser coil temperature is greater than a second
set temperature, the outdoor fan is controlled to operate at the
target rotational speed of the outdoor fan determined according to
a latest read outdoor environment temperature and the outdoor
condenser coil temperature detected by the first temperature
detection unit and the second temperature detection unit within the
second set time.
[0055] The outdoor condenser coil temperature is the higher one of
the outdoor condenser coil temperatures detected by the first
temperature detection unit and the second temperature detection
unit.
[0056] According to the method provided by the present embodiment,
the control unit controls the outdoor fan to operate at the target
rotational speed of the outdoor fan determined by the detected
outdoor environment temperature and the outdoor condenser coil
temperature, thereby realizing a multi-unit control of the outdoor
fan of the air conditioner; since an outdoor condenser is provided
with two temperature detection units, sampling points of the
outdoor condenser coil temperature are increased, and a potential
risk that the operation of the air conditioner cannot be controlled
due to a damage of a single detection unit is avoided.
[0057] In other embodiments, according to the control method for
the outdoor fan of the air conditioner, the controlling, by a
control unit, the outdoor fan to operate at a target rotational
speed of the outdoor fan determined according to an outdoor
environment temperature and an outdoor condenser coil temperature
detected by a first temperature detection unit and a second
temperature detection unit within a third set time includes the
following steps.
[0058] Step S401, the outdoor environment temperature and the
outdoor condenser coil temperature are read once every third set
time, and the step ends after reading six groups of data.
[0059] The third set time is 30 seconds, and the temperature is
read once every 30 seconds, thereby improving the efficiency of
controlling the rotational speed of the outdoor fan while
increasing the number of samples. In the six groups of data, each
group of data includes the outdoor environment temperature detected
by the outdoor environment temperature detection unit and the
outdoor condenser coil temperature detected by the first
temperature detection unit and the outdoor condenser coil
temperature detected by the second temperature detection unit.
[0060] Step S402, a higher one of outdoor condenser coil
temperatures detected by the first temperature detection unit and
the second temperature detection unit is taken as the outdoor
condenser coil temperature.
[0061] In the read six groups of data, each group of data includes
two outdoor condenser coil temperatures, and the higher one of the
two outdoor condenser coil temperatures is taken as an effective
value of the outdoor condenser coil temperature to calculate the
rotational speed of the outdoor fan.
[0062] Step S403, an average value of the outdoor environment
temperature and an average value of the outdoor condenser coil
temperature are calculated.
[0063] The average value of the outdoor environment temperature and
the average value of the outdoor condenser coil temperature in the
six groups of data are calculated.
[0064] Step S404, the target rotational speed of the outdoor fan is
calculated according to the average value of the outdoor
environment temperature and the average value of the outdoor
condenser coil temperature.
[0065] According to the average value of the outdoor environment
temperature and the average value of the outdoor condenser coil
temperature, the target rotational speed of the outdoor fan is
calculated by the following formula:
n = N * ( Ta 0 + 273.15 ) * ( Tp 0 - Ta 0 ) * ( 273.15 + Tp 0 ) (
Tp - Ta ) * ( 273.15 + Tp ) * ( 273.15 + Ta ) ##EQU00006##
[0066] wherein n is the target rotational speed of the outdoor fan,
N is a rated maximum rotational speed when the outdoor fan operates
at full speed, Tp0 is an outdoor condenser coil temperature preset
by the air conditioner, Ta0 is an outdoor environment temperature
preset by the air conditioner, Tp is the outdoor condenser coil
temperature, Ta is the outdoor environment temperature, 273.15 is
the lowest temperature of thermodynamics, and the unit of
thermodynamic temperature scale is Kelvin.
[0067] Step S405, the outdoor fan is controlled to operate at the
target rotational speed.
[0068] The control unit controls the outdoor fan to operate at the
calculated target rotational speed.
[0069] According to the method provided by the present embodiment,
the target rotational speed of the outdoor fan is determined by the
detected outdoor environment temperature and the outdoor condenser
coil temperature, thereby realizing a multi-unit control of the
outdoor fan of the air conditioner; since an outdoor condenser is
provided with two temperature detection units, sampling points of
the outdoor condenser coil temperature are increased, and a
potential risk that the operation of the air conditioner cannot be
controlled due to a damage of a single detection unit is
avoided.
[0070] It should be understood that, the present disclosure is not
limited to the flowchart and structures described above and shown
in the accompanying drawings, and various modifications and changes
may be made without departing from the scope. The scope of the
present disclosure is limited only by the appended claims.
* * * * *