U.S. patent application number 17/058411 was filed with the patent office on 2021-07-01 for method and system for detecting a failure in hvac system, and memorizer.
The applicant listed for this patent is Carrier Corporation. Invention is credited to Sheng Li, Xinyu Wu.
Application Number | 20210199325 17/058411 |
Document ID | / |
Family ID | 1000005504089 |
Filed Date | 2021-07-01 |
United States Patent
Application |
20210199325 |
Kind Code |
A1 |
Wu; Xinyu ; et al. |
July 1, 2021 |
METHOD AND SYSTEM FOR DETECTING A FAILURE IN HVAC SYSTEM, AND
MEMORIZER
Abstract
The invention relates to a method, a system and a storage for
detecting a fault of a HVAC system. The method comprises the steps
of: obtaining room air temperatures and compressor equivalent
runtime during the operation of the HVAC system; calculating a rate
of change per unit time of the room air temperatures within the
compressor equivalent runtime; and determining whether a fault
occurs in the HVAC system based on a change in the rate of change
per unit time of the room air temperatures. The invention can be
applied to a HVAC system for an on-line fault detection, which is
able to effectively detect a series of faculties and may output
information such as an alert to help to increase the security and
the user satisfaction of the HVAC system.
Inventors: |
Wu; Xinyu; (Shanghai,
CN) ; Li; Sheng; (Shanghai, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Carrier Corporation |
Palm Beach Gardens |
FL |
US |
|
|
Family ID: |
1000005504089 |
Appl. No.: |
17/058411 |
Filed: |
July 2, 2019 |
PCT Filed: |
July 2, 2019 |
PCT NO: |
PCT/US2019/040217 |
371 Date: |
November 24, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F24F 11/64 20180101;
F24F 11/38 20180101; F24F 2140/50 20180101; F24F 11/58 20180101;
F24F 2110/10 20180101 |
International
Class: |
F24F 11/38 20060101
F24F011/38; F24F 11/64 20060101 F24F011/64; F24F 11/58 20060101
F24F011/58 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 9, 2018 |
CN |
201810744283.9 |
Claims
1. A method for detecting a fault of an HVAC system, comprising:
obtaining room air temperatures and compressor equivalent runtime
during the operation of the HVAC system; calculating a rate of
change per unit time of the room air temperatures within the
compressor equivalent runtime; and determining whether a fault
occurs in the HVAC system based on a change in the rate of change
per unit time of the room air temperatures.
2. The method according to claim 1, wherein the room air
temperatures are obtained from a temperature controller for
controlling the HVAC system.
3. The method according to claim 1, wherein operation data of each
compression stage of the HVAC system is obtained from the HVAC
system, and the compressor equivalent runtime is obtained by making
a calculation based on a capacity ratio of each compression
stage.
4. The method according to claim 1, further comprising: setting
value properties of the rate of change per unit time of the room
air temperatures when the HVAC system operates in a cooling mode
and a heating mode to be contrary, and distributing along a time
axis the rate of change per unit time of the room air temperatures
determined as abnormal values, the value properties indicating
positive value or negative value; counting the number of the rate
of change per unit time of the room air temperatures distributed on
the time axis within a time window, or processing the values of the
rate of change per unit time of the room air temperatures within
the time window to obtain a processed value; and determining that a
fault has occurred in the HVAC system if the number exceeds a
predetermined value or the processed value exceeds a preset
value.
5. The method according to claim 4, further comprising: outputting
report information after the fault is determined to have occurred
in the HVAC system.
6. The method according to claim 5, wherein the report information
is transmitted to a cloud server via a wireless network, the
wireless network comprising Wi-Fi, 4G, BT or ZigBee network.
7. The method according to claim 4, wherein the rate of change per
unit time of the room air temperatures is determined as an abnormal
value when the value property of the rate of change per unit time
of the room air temperatures in the cooling mode or the heating
mode is contrary to a set value property, or a difference value
between the rate of change per unit time of the room air
temperatures and zero is less than a preset value.
8. A system for detecting a fault of an HVAC system, comprising a
processor configured to perform the steps of: obtaining room air
temperatures and compressor equivalent runtime during the operation
of the HVAC system; calculating a rate of change per unit time of
the room air temperatures within the compressor equivalent runtime;
and determining whether a fault occurs in the HVAC system based on
a change in the rate of change per unit time of the room air
temperatures.
9. The system according to claim 8, wherein the room air
temperatures are obtained by the processor from a temperature
controller for controlling the HVAC system.
10. The system according to claim 8, wherein operation data of each
compression stage is obtained by the processor from the HVAC
system, and the compressor equivalent runtime is obtained by the
processor by making a calculation based on a capacity ratio of each
compression stage.
11. The system according to claim 8, wherein the processor is
further configured to perform the steps of: setting value
properties of the rate of change per unit time of the room air
temperatures when the HVAC system operates in a cooling mode and a
heating mode to be contrary, and distributing along a time axis the
rate of change per unit time of the room air temperatures
determined as abnormal values, the value properties indicating
positive value or negative value; counting the number of the rate
of change per unit time of the room air temperatures distributed on
the time axis within a time window, or processing values of the
rate of change per unit time of the room air temperatures within
the time window to obtain a processed value; and determining that a
fault has occurred in the HVAC system if the number exceeds a
predetermined value or the processed value exceeds a preset
value.
12. The system according to claim 11, wherein the processor is
further configured to: output report information after the fault is
determined to have occurred in the HVAC system.
13. The system according to claim 12, wherein the report
information is transmitted to a cloud server via a wireless
network, the wireless network comprising Wi-Fi, 4G, BT or ZigBee
network.
14. The system according to claim 11, wherein the rate of change
per unit time of the room air temperatures is determined as an
abnormal value when the value property of the rate of change per
unit time of the room air temperatures in the cooling mode or the
heating mode is contrary to a set value property, or a difference
value between the rate of change per unit time of the room air
temperatures and zero is less than a preset value.
15. A storage for storing instructions, when being executed, to
implement the method for detecting a fault of a HVAC system
according to claim 1.
16. The system according to claim 11, wherein the step of
processing the values comprises calculating a sum of the values,
calculating an arithmetic mean value of the values, or calculating
a weighted mean value of the values.
17. The method according to claim 4, wherein the step of processing
the values comprises calculating a sum of the values, calculating a
arithmetic mean value of the values, or calculating a weighted mean
value of the values.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to the field of detection and
control, and more especially to a method, a system and a storage
for detecting a fault of a HVAC system.
BACKGROUND
[0002] The HVAC (Heating, Ventilation and Air Conditioning) system
has been widely applied, which brings great convenience and comfort
to people's daily work and life. Since a HVAC system is generally
provided with a large number of various components, some faults
such as refrigerant leaks and damages to compressor capacitor are
likely to occur, especially after long-term use. Although the prior
art has provided a great many technical means to detect fault
conditions in a HVAC system, these existing technical means still
have flaws and deficiencies in the aspects such as complexity,
correctness, convenience and user experience, which may be further
improved and optimized.
SUMMARY OF THE INVENTION
[0003] In view of this, the present invention provides a method, a
system and a storage for detecting a fault of a HVAC system, in
order to address or at least relieve one or more of the
above-described problems existing in prior arts and problems in
other aspects.
[0004] Firstly, according to a first aspect of the present
invention, the present invention provides a method for detecting a
fault of a HVAC system, comprising the steps of:
[0005] obtaining room air temperatures and compressor equivalent
runtime during the operation of the HVAC system;
[0006] calculating a rate of change per unit time of the room air
temperatures within the compressor equivalent runtime; and
[0007] determining whether a fault occurs in the HVAC system based
on a change in the rate of change per unit time of the room air
temperatures.
[0008] In a method according to the present invention, optionally,
the room air temperatures are obtained from a temperature
controller for controlling the HVAC system.
[0009] In a method according to the present invention, optionally,
operation data of each compression stage of the HVAC system is
obtained from the HVAC system, and the compressor equivalent
runtime is obtained by making a calculation based on a capacity
ratio of each compression stage.
[0010] In a method according to the present invention, optionally,
the method further comprises the steps of:
[0011] setting value properties of the rate of change per unit time
of the room air temperatures when the HVAC system operates in a
cooling mode and a heating mode to be contrary, and distributing
along a time axis the rate of change per unit time of the room air
temperatures determined as abnormal values, the value properties
indicating positive value or negative value;
[0012] counting the number of the rate of change per unit time of
the room air temperatures distributed on the time axis within a
time window, or processing the values of the rate of change per
unit time of the room air temperatures within the time window to
obtain a processed value; and
[0013] determining that a fault has occurred in the HVAC system if
the number exceeds a predetermined value or the processed value
exceeds a preset value.
[0014] In a method according to the present invention, optionally,
the method further comprises the step of:
[0015] outputting report information after the fault is determined
to have occurred in the HVAC system.
[0016] In a method according to the present invention, optionally,
the report information is transmitted to a cloud server via a
wireless network, the wireless network comprising Wi-Fi, 4G, BT or
ZigBee network.
[0017] In the method according to the present invention,
optionally, the rate of change per unit time of the room air
temperatures is determined as an abnormal value when the value
property of the rate of change per unit time of the room air
temperatures in the cooling mode or the heating mode is contrary to
a set value property, or a difference value between the rate of
change per unit time of the room air temperatures and zero is less
than a preset value; and/or wherein the step of the processing of
the values comprises calculating a sum of the values, calculating a
arithmetic mean value of the values, or calculating a weighted mean
value of the values.
[0018] Secondly, in a second aspect of the present invention, the
present invention provides a system for detecting a fault of a HVAC
system, comprising a processor configured to perform the steps
of:
[0019] obtaining room air temperatures and compressor equivalent
runtime during the operation of the HVAC system;
[0020] calculating a rate of change per unit time of the room air
temperatures within the compressor equivalent runtime; and
[0021] determining whether a fault occurs in the HVAC system based
on a change in the rate of change per unit time of the room air
temperatures.
[0022] In the system according to the present invention,
optionally, the room air temperatures are obtained by the processor
from a temperature controller for controlling the HVAC system.
[0023] In the system according to the present invention,
optionally, operation data of each compression stage of the HVAC
system is obtained by the processor from the HVAC system, and the
compressor equivalent runtime is obtained by the processor by
making a calculation based on a capacity ratio of each compression
stage.
[0024] In the system according to the present invention,
optionally, the processor is further configured to perform the
steps of:
[0025] setting value properties of the rate of change per unit time
of the room air temperatures when the HVAC system operates in a
cooling mode and a heating mode to be contrary, and distributing
along a time axis the rate of change per unit time of the room air
temperatures determined as abnormal values, the value properties
indicating positive value or negative value;
[0026] counting the number of the rate of change per unit time of
the room air temperatures distributed on the time axis within a
time window, or processing the values of the rate of change per
unit time of the room air temperatures within the time window to
obtain a processed value; and
[0027] determining that a fault has occurred in the HVAC system if
the number exceeds a predetermined value or the processed value
exceeds a preset value.
[0028] In the system according to the present invention,
optionally, the processor is further configured to:
[0029] output report information after the fault is determined to
have occurred in the HVAC system.
[0030] In the system according to the present invention,
optionally, the report information is transmitted to a cloud server
via a wireless network, the wireless network comprising Wi-Fi, 4G,
BT or ZigBee network.
[0031] In the system according to the present invention,
optionally, the rate of change per unit time of the room air
temperatures is determined as an abnormal value when the value
property of the rate of change per unit time of the room air
temperatures in the cooling mode or the heating mode is contrary to
a set value property, or a difference value between the rate of
change per unit time of the room air temperatures and zero is less
than a preset value; and/or wherein the step of processing the
values comprises calculating a sum of the values, calculating an
arithmetic mean value of the values, or calculating a weighted mean
value of the values.
[0032] Moreover, in a third aspect of the present invention, the
present invention further provides a storage for storing
instructions, wherein the instructions, when being executed, to
implement the method for detecting a fault of a HVAC system
according to any one of above items.
[0033] From the following description in combination with figures,
one will clearly understand the principles, characteristics,
features and advantage of various technical solutions of the
present invention. For instance, as will be understood, in
comparison with prior arts, the method, system and storage for
detecting a fault of a HVAC system according to the present
invention have significant technical advantages and can be used for
on-line fault detection of a HVAC system in order to effectively
detect a series of faults such as faults of fast occurrence and
faults involving slow degeneration of system performance, and
output information such as alerts. This will help relevant staff to
find and identify HVAC system terminals possibly having problems
more easily, so as to carry out an examination and repair as early
as possible, and thereby increase the security and user
satisfaction of the HVAC system.
BRIEF DESCRIPTION OF THE DRAWINGS
[0034] The technical solutions of the present invention will be
further described in detail below in conjunction with the drawings
and embodiments. However, it should be understood that the drawings
are designed merely for illustrative purpose and are intended only
to conceptually explain the configuration described herein. It is
unnecessary to draw the drawings in proportion.
[0035] FIG. 1 is a schematic flow diagram illustrating an
embodiment of a method for detecting a fault of a HVAC system
according to the present invention.
[0036] FIG. 2 is a schematic diagram illustrating compression stage
runtime in an example of a HVAC system with two compression
stages.
[0037] FIG. 3 is a schematic diagram illustrating a corresponding
relationship between room air temperature and runtime in an example
of a HVAC system.
[0038] FIG. 4 is a schematic diagram illustrating using a time
window example to take statistics of the distribution of a rate of
change per unit time of the room air temperature.
[0039] FIG. 5 is a schematic diagram about determining that a fault
has occurred in one HVAC system example based on a statistical
result of the distribution of a rate of change per unit time of the
room air temperature shown in FIG. 4.
DETAILED DESCRIPTION OF THE INVENTION
[0040] Firstly, it should be noted that steps, compositions,
features and advantages of a method, system and storage for
detecting a fault of a HVAC system according to the present
invention will be illustrated hereinafter by way of examples.
However, all the descriptions should not impose any limitation to
the present invention.
[0041] Moreover, as for any single technical feature described or
implied in embodiments mentioned herein, or any single technical
feature described or implied in each figure, the present invention
still allows, without any technical difficulties, any combination
or deletion of these technical features (or equivalents), such that
it should be considered that more such embodiments according to the
present invention are within the disclosure scope of this text.
Besides, for the sake of simplicity, identical or similar
components and features may be labeled in one or more places at the
same figure.
[0042] FIG. 1 exemplarily shows a basic flow of an embodiment of a
method for detecting a fault of a HVAC system according to the
present invention, which may be employed to on-line detect a fault
of a HVAC system conveniently. In this embodiment, the method may
comprise the steps of:
[0043] Firstly, in Step S11, obtaining room air temperatures during
the operation of the HVAC system, and obtaining the equivalent
runtime of the compressor during the operation of the HVAC system.
The data will be used to calculate a rate of change per unit time
of the room air temperature discussed hereinafter.
[0044] As for the room air temperatures, the temperature data may
be obtained in various ways. For example, the temperature data may
be acquired by one or more temperature measuring elements, devices,
instruments or the like disposed in the HVAC system, and may also
be obtained conveniently from a temperature controller configured
to control the HVAC system. By way of an example only, FIG. 3
illustrates six room air temperature data A, B, C, D, E and F
during the operation of HVAC system, which schematically shows room
air temperature fluctuations during the operation of HVAC
system.
[0045] As for the compressor equivalent runtime, since one HVAC
system is generally provided with a plurality of compression
stages, for example, provided with a plurality of compressors, or
having one or more of the compressors provided with a plurality of
compression stages. Thus, it is necessary to translate the runtime
of all the compression stages in a HVAC system into a compressor
equivalent runtime. FIG. 2 exemplarily shows a HVAC system provided
with two compression stages, i.e. compression stage 1 and
compression stage 2. As illustrated in FIG. 3, it schematically
shows a compressor equivalent runtime line 3 of one HVAC system
after translation
[0046] In the method of the present invention, the above-described
compressor equivalent runtime may be obtained in various ways,
which will be exemplarily explained below.
[0047] For example, operation data of each of the compression
stages can be obtained from a HVAC system, and then compressor
equivalent runtime is obtained by making a calculation based on
respective capacity ratios of these compressor stages. That is to
say, by multiplying the runtime of each compression stage and its
capacity ratio to obtain a product of each compression stage, and
then adding such products of the compression stages, the compressor
equivalent runtime can be obtained.
[0048] For another example, an equivalent translation table may be
provided based on data from the producer or supplier of the HVAC
system or the compressor(s) therein or from professional
institutions, or data from a test of a HVAC system or the
compressor(s) therein. Therefore, the corresponding compressor
equivalent runtime can be obtained by directly by consulting the
table.
[0049] Secondly, in Step S12, making a calculation based on the
obtained room air temperatures and compressor equivalent runtime,
to obtain a rate of change per unit time of the room air
temperature within the compressor equivalent runtime, and
distributing the obtained rate of change per unit time of the room
air temperatures along a time axis. For example, a change rate per
hour of room air temperature may be calculated by using one hour as
a unit time. Certainly, without a deviation from the purport of the
present invention, the method of the present invention also allows
to select other proper time intervals (e.g., 15 minutes, 30
minutes, 1.5 hours, 2 hours, 5 hours, etc.) as the unit time to
calculate the rate of change per unit time of the room air
temperature.
[0050] Subsequently, in Step S13, after the rate of change per unit
time of the room air temperature are calculated, determining
whether a fault occurs in the HVAC system based on changes of the
data. This is because the rate of change per unit time of the room
air temperature roughly indicates the fluctuation of room air
temperature in a set unit time. That is to say, the data may
reflect the operation condition of the HVAC system.
[0051] For instance, if relatively many data obviously deviating an
average level occur in the unit time s of room air temperature
(e.g., the data exceed over 50% of other data values that conform
to the average level), it means that there may be an abnormality or
fault occurred in one or some of the component(s), unit(s) or
module(s) in the current HVAC system, or that the HVAC system may
have experienced slow degeneration of performance, and thereby the
HVAC system fails to continuously operate stably, which is embodied
as that abnormal fluctuations occur to the rate of change per unit
time of the room air temperature. As such, it can be effectively
detected and determined that a fault has happened to the HVAC
system.
[0052] For another example, the obtained a rate of change per unit
time of the room air temperature may be further differentiated
based on an operation mode of the HVAC system, to facilitate a
fault analysis of the HVAC system based on corresponding changes in
the rate of change per unit time of the room air temperature. To be
specific, as illustrated in FIG. 4, the obtained rate of change per
unit time of the room air temperature are distributed along a time
axis. For example, the unit time (such as one hour) employed in the
calculation of a rate of change per unit time of the room air
temperature is taken as the internal unit of the time axis. The
value properties of the rate of change per unit time of the room
air temperatures when the HVAC system operates in a cooling mode
and a heating mode may be defined as follows: in the cooling mode,
the rate of change per unit time of the room air temperature with a
normal property of room air temperature is set as a negative value,
which is below the zero axis indicated by the dotted line shown in
FIG. 4, while the rate of change per unit time of the room air
temperature with an abnormal property of room air temperature is
set as a positive value, which is above the zero axis indicated by
the dotted line shown in FIG. 4; in the heating mode, the rate of
change per unit time of the room air temperature with a normal
property of room air temperature is set as a positive value, which
is above the zero axis indicated by the dotted line shown in FIG.
4, while the rate of change per unit time of the room air
temperature with an abnormal property of room air temperature is
set as a negative value, which is below the zero axis indicated by
the dotted line shown in FIG. 4. To be specific, if the HVAC system
operates in the cooling mode, a data dot 4 of a positive value will
be determined as an abnormal value; if the HVAC system operates in
the heating mode, a data dot 5 of a negative value will be
determined as an abnormal value. The above-described abnormal
values mean the values being deviated from a normal value. For
example, the value property of the rate of change per unit time of
the room air temperature in the cooling mode or a heating mode
being absolutely contrary to a set value property (that is, the
value property of a normal value should be a negative value in the
cooling mode, while an abnormal value is indicated by a positive
value in the cooling mode, whereas the value property of a normal
value should be a positive value in the heating mode, while the
abnormal value is indicated by a negative value in the heating
mode). It should be understood that, although corresponding normal
value properties and abnormal value properties are defined for
different operation modes in the above embodiments, reversely
defining the normal value property and abnormal value property is
also feasible. For another example, if the difference value between
a rate of change per unit time of the room air temperature and zero
is smaller than a preset value (values close to zero such as -0.1,
0.1, -0.15 or 0.15), the rate of change per unit time of the room
air temperature may be determined as an abnormal value.
[0053] Subsequently, a time window 6 (which may be a runtime window
or a calendar time window, and which may be chosen and configured
based on specific application requirements) is set, and the number
of the rate of change per unit time of the room air temperature
with positive values (the number is two in the embodiment of FIG.
4) or the number of the rate of change per unit time of the room
air temperature with negative values (the number is eight in the
embodiment of FIG. 4) within the time window 6 is counted.
[0054] If a sum of the number of positive values (or a sum of the
number of negative values) exceeds a preset value T (which can be
chosen and set according to specific application requirements),
i.e., the circumstance illustrated by FIG. 5, in which if a dot P
has already exceeded the preset value T, it can be determined that
a fault has been occurred in the HVAC system, wherein the fault is
likely to be a fault of fast occurrence in the HVAC system (e.g.,
an operation abnormality occurs to a compressor capacitor), or a
fault caused by slow performance degeneration of the HVAC system
(e.g., a refrigerant leak, or pipe blocking of a heat exchanger) or
others alike.
[0055] Moreover, it should be noted that, the method of the present
invention allows using various other approaches to determine a HVAC
system default based on the above-described rate of change per unit
time of the room air temperature. For example, the values of the
rate of change per unit time of the room air temperature (i.e., the
values of abnormal dots) appearing within the time window 6 may be
processed to obtain a processed value, and then it is determined
whether a fault occurs in the HVAC system based on whether the
obtained processed value exceeds a set value (which can be chosen
and set according to specific application requirements). That is,
if the processed value exceeds the set value, it can be determined
that a fault has occurred in the HVAC system. FIG. 5 illustrates
such a determination circumstance as well.
[0056] For example, various calculation ways may be employed for
processing the values of abnormal dots, and they may include, but
not be limited to: calculating a sum of the values of these
abnormal dots, calculating an arithmetic mean value of the values
of these abnormal dots, and calculating a weighted mean value of
the values of these abnormal dots. It should be understood that,
the method of the present invention completely allows using more
other possible calculating ways to process values of abnormal dots.
Such a value processing result can reflect serious circumstances of
these abnormal dots deviating from a normal value or a normal
range. Further, the result may be compared with a set value to
determine the possibility of fault occurrence in a HVAC system.
[0057] In optional cases, when it is determined via detection that
a fault has occurred in a HVAC system, some corresponding measures
may be employed. For example, report information may be output,
which may include, but not be limited to, alerting in the forms
such as text, images, sound and/or light so as to urge relevant
staff be aware of the fault of the HVAC system and thus can go for
fixing the fault as early as possible. For another example, the
above-described information may be uploaded to a cloud server via a
wireless network (such as Wi-Fi, 4G, BT or ZigBee network). In this
manner, staff may conveniently and quickly identify, from a cloud
server, the HVAC system terminal that has outputted the report
information and possibly has a problem. Thus, the HVAC system
terminal possibly having a problem can be inspected and repaired as
soon as possible, and at this time, the owner of the HVAC system
might know nothing about that a problem has occurred to the HVAC
system (such as refrigerant leaks and damages to compressor
capacitor) and that adverse influences might be caused by it
momentarily. Therefore, this will extremely increase user
satisfaction and can increase security and reliability of the HVAC
system.
[0058] As an aspect that is apparently better than prior arts, the
present invention further provides a system for detecting a fault
of a HVAC system. For example, a system of the present invention
may be provided with a processor, which is configured to perform
the steps of:
[0059] firstly, obtaining room air temperatures during the
operation of the HVAC system (e.g., from a controller for
controlling the HVAC system), and obtaining compressor equivalent
runtime during the operation of the HVAC system (e.g., by the means
exemplarily discussed above).
[0060] secondly, calculating a rate of change per unit time of the
room air temperature within the compressor equivalent runtime
(e.g., by the means exemplarily discussed above); and
[0061] subsequently, determining whether a fault occurs in the HVAC
system based on a change in the rate of change per unit time of the
room air temperatures (e.g., by the means exemplarily discussed
above).
[0062] Moreover, in some optional cases, the above-described
processor may also be configured to perform the steps of:
[0063] setting value properties of the rate of change per unit time
of the room air temperatures when the HVAC system operates in a
cooling mode and a heating mode to be negative values (or positive
ones) and positive values (or negative ones), respectively, and
distributing along a time axis the rate of change per unit time of
the room air temperatures when they are determined as abnormal
values;
[0064] counting the number of the rate of change per unit time of
the room air temperatures distributed on the time axis within a
time window (which may be a runtime window or a calendar time
window, and which may be chosen and configured according to
requirements of specific applications); and
[0065] determining that a fault has occurred in the HVAC system if
the counted number exceeds a preset value.
[0066] Moreover, in some optional cases, the above-described
processor may be further configured to: output report information
after the fault is determined to have occurred in the HVAC system.
As mentioned above, the report information may be uploaded to a
cloud server via a wireless network (such as Wi-Fi, 4G, BT or
ZigBee network) such that relevant staff can be informed in time
and then inspection, repair and the like can be carried out.
[0067] It should understood that, elaborations have been made in
preceding text about description of the method of the present
invention, which are directed to the technical contents such as the
compressor equivalent runtime, the rate of change per unit time of
the room air temperature, the time window, the differentiation of a
rate of change per unit time of the room air temperature based on
the cooling mode and the heating mode, the determination of
abnormal values and processing of abnormal values, and thus, one
may directly refer to specific description in corresponding
portions of preceding text, and no redundant identical or similar
technical contents about the system according to the present
invention will be stated here.
[0068] Moreover, the present invention further provides a storage
for storing instructions, wherein the instructions, when being
executed, to implement the method for detecting a fault of a HVAC
system according to the present invention, so as to present
advantages of the invention over prior arts as mentioned above.
[0069] The method, system and storage for detecting a fault of a
HVAC system according to the present invention are explained above
by way of examples, which are merely intended for the purpose of
explaining the principle and implementing means of the present
invention, rather than limiting it. Without a deviation from the
spirit and scope of the present invention, one skilled in the art
may further make a variety of modifications and improvements.
Therefore, all equivalent to technical solutions should belong to
the scope of the present invention and be covered by all the claims
of the present invention.
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