CN108278714B - Control method of air conditioner - Google Patents
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- CN108278714B CN108278714B CN201710005442.9A CN201710005442A CN108278714B CN 108278714 B CN108278714 B CN 108278714B CN 201710005442 A CN201710005442 A CN 201710005442A CN 108278714 B CN108278714 B CN 108278714B
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Abstract
The invention provides a control method of an air conditioner, which comprises the following steps: s1: detecting the running current of the air conditioner in real time; s2: judging whether the current value is smaller than a first current threshold value or not; if yes, go to step S3; if not, stopping the compressor; s3: judging whether the current value is smaller than a second current threshold value; if yes, go to step S4; if not, reducing the running frequency of the compressor; s4: judging whether the current value is smaller than a third current threshold value; if so, the compressor continues to work normally; if not, the compressor keeps the current running frequency and prohibits the frequency increasing. When the current is abnormal during the operation of the air conditioner, the invention sets the current threshold value for the operation current of the air conditioner, controls the compressor according to the condition that the actual current value reaches the current threshold value, plays a role in protecting the current of the air conditioner, not only avoids the condition that the air conditioner is burnt out due to the sudden failure of the current, but also ensures the operation of the air conditioner to the maximum extent when the current is abnormal, and cannot influence the use of users.
Description
Technical Field
The invention relates to the field of household appliances, in particular to a control method of an air conditioner.
Background
At present, household appliances bring more and more convenience to people and also enable the quality of life to be higher and higher. However, in the using process of the household electrical appliance, the current suddenly increases due to some circuit faults, and at this time, the sudden increase of the current not only affects the service life of the household electrical appliance, but also may cause the household electrical appliance to be burned out, resulting in user loss. The invention provides a current protection method of an air conditioner, taking the air conditioner as an example, and the phenomenon of air conditioner burnout caused by sudden failure of current when the air conditioner runs can be avoided by the method.
Patent document No. 201310248544.5 discloses a control method of an air conditioner, including: s1: in the cooling operation mode, an operation time and an operation current of a compressor of the air conditioner are detected. S2: the detected operating current of the compressor is compared with a first predetermined value. S3: and when the running current of the compressor is detected to be greater than or equal to the first preset value, controlling the rotating speed of the indoor fan of the air conditioner to be reduced to a preset rotating speed from the rotating speed of the current wind gear, and when the running current of the compressor is detected to be smaller than the first preset value, returning to the step S2, wherein the preset rotating speed is smaller than the rotating speed of the low wind gear of the air conditioner. However, in this patent, when the operating current of the compressor exceeds a predetermined current, the operating current of the compressor is reduced by controlling the rotational speed of the indoor fan, and this method merely reduces the operating current of the compressor by controlling the operation of the indoor fan, and does not directly control the operation of the compressor, and thus cannot directly and effectively protect the air conditioner from the current.
Disclosure of Invention
The invention aims to solve the problem that the air conditioner is burnt out due to sudden failure of current when the air conditioner runs. Therefore, the invention provides a control method of an air conditioner, which can effectively carry out current protection on the air conditioner.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a control method of an air conditioner, comprising:
s1: detecting the running current of the air conditioner in real time;
s2: judging whether the current value is smaller than a first current threshold value or not; if yes, go to step S3; if not, stopping the compressor and carrying out current protection;
s3: judging whether the current value is smaller than a second current threshold value; if yes, go to step S4; if not, reducing the running frequency of the compressor;
s4: judging whether the current value is smaller than a third current threshold value; if so, the compressor continues to work normally; if not, the compressor keeps the current running frequency and prohibits the frequency increasing;
wherein, in terms of magnitude of the value, the first current threshold, the second current threshold and the third current threshold decrease in sequence.
Further, in step S2, when the determination result is negative, that is, when the current value is greater than or equal to the first current threshold value, the following steps are specifically executed:
s201: recording the current running frequency of the compressor, and stopping the compressor;
s202: judging whether the current value is smaller than a fourth current threshold value; if not, continuing to step S202; if yes, go to step S203;
s203: starting the compressor;
s204: frequency is increased in stages;
wherein, in terms of magnitude of the value, the fourth current threshold is smaller than the third current threshold.
Preferably, in the step-by-step frequency increasing process in step S204, a normal frequency increasing stage and a slow frequency increasing stage are included;
the compressor firstly carries out a normal frequency increasing stage, namely, the compressor runs at a normal frequency increasing speed; and when the air conditioner does not reach the frequency limiting protection and the operating frequency of the compressor reaches the rated proportion of the operating frequency value recorded in the step S201, performing a slow frequency increasing stage.
Further, in step S3, when the determination result is negative, that is, when the current value is greater than or equal to the second current threshold value, the following steps are specifically executed:
s301: and recording the current running frequency of the compressor.
S302: and reducing the frequency by stages.
S303: judging whether the running frequency is reduced to the lowest rated frequency or not; if not, go to step S304; if yes, go to step S305.
S304: judging whether the current value is smaller than a second current threshold value; if not, continuing to step S302; if yes, go to step S307.
S305: the compressor is kept running at the lowest rated frequency.
S306: judging whether the current value is smaller than a second current threshold value; if not, continue to step S305; if yes, go to step S307.
S307: the compressor maintains the current frequency operation and inhibits the frequency up-conversion.
S308: judging whether the current value is smaller than a third current threshold value; if not, continue to step S308; if yes, go to step S309.
S309: and (4) ascending the frequency in stages.
Preferably, in the step S302 of step-by-step frequency reduction, a rated frequency reduction period and a rated frequency reduction point are set, the compressor reduces the frequency at the rated frequency reduction point, and reduces the frequency at the rated frequency reduction point again after one rated frequency reduction period, and the process is repeated until any condition that the operating frequency is changed to the lowest rated frequency or the current value is smaller than the second current threshold value is met;
the rated frequency reduction period and the rated frequency reduction point are preset values, are set in a specific data form when the air conditioner leaves a factory, and are stored in an EEPROM (electrically erasable programmable read-only memory).
Preferably, in the step-by-step frequency increasing process in step S309, a normal frequency increasing stage and a slow frequency increasing stage are included;
the compressor firstly carries out a normal frequency increasing stage, namely, the compressor runs at a normal frequency increasing speed; and when the air conditioner does not reach the frequency limiting protection and the operating frequency of the compressor reaches the rated proportion of the operating frequency value recorded in the step S301, performing a slow frequency increasing stage.
Further, in step S4, when the determination result is negative, that is, when the current value is greater than or equal to the third current threshold value, the following steps are specifically executed:
s401: keeping the current frequency and forbidding frequency rising;
s402: judging whether the current value is smaller than a third current threshold value; if not, continuing to step S402; if yes, go to step S403;
s403: the compressor resumes normal operation.
Preferably, the first current threshold, the second current threshold, the third current threshold, and the fourth current threshold are preset values, are set in a specific data format when the air conditioner is shipped from a factory, and are stored in an EEPROM (electrically erasable and programmable read only memory).
Further, the third current threshold is a reference value used for judging whether the compressor works normally or not according to the specification of each device in the air conditioner and the data obtained by the experimental condition.
Preferably, the first current threshold is 1.25-1.35 times of the third current threshold, and is used for judging a reference value for stopping the operation of the compressor, so that the internal devices of the air conditioner are prevented from being burnt out due to overlarge current;
the second current threshold is 1.05-1.15 times of the third current threshold and is used for judging whether the reference value of the running frequency of the compressor is reduced or not;
the fourth current threshold is 0.85-0.95 times of the third current threshold, and is used for judging whether the current is recovered to a normal range or not, and the fourth current threshold is used as a judgment basis for judging whether the current fault is removed or not, so that the air conditioner compressor is ensured to be started under a safe current environment.
Compared with the prior art, when the current is abnormal during the operation of the air conditioner, the invention sets different current thresholds for the operation current of the air conditioner, controls the operation state of the compressor according to the condition that the actual current value reaches different current thresholds, plays the role of current protection for the air conditioner, not only avoids the condition that the air conditioner is burnt out due to sudden failure of the current, but also ensures the operation of the air conditioner to the maximum extent when the current is abnormal, and does not influence the use of users.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flow chart illustrating a control method of an air conditioner according to the present invention.
Fig. 2 is another flow chart of a control method of an air conditioner according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are further described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Embodiment 1, as shown in fig. 1, a control method of an air conditioner of the present invention includes the steps of:
s1: the air conditioner operation current is detected in real time, wherein methods for detecting the air conditioner operation current are well known to those skilled in the art and will not be described herein.
S2: judging whether the current value is smaller than a first current threshold value or not; if yes, go to step S3; if not, the compressor is stopped, and current protection is carried out.
S3: judging whether the current value is smaller than a second current threshold value; if yes, go to step S4; if not, the running frequency of the compressor is reduced.
S4: judging whether the current value is smaller than a third current threshold value; if so, the compressor continues to work normally; if not, the compressor keeps the current running frequency and prohibits the frequency increasing.
In the above method, the first current threshold, the second current threshold, and the third current threshold are preset values, and are set in a specific data form when the air conditioner leaves a factory, and are stored in an EEPROM (electrically erasable and programmable read only memory).
In terms of magnitude, the first current threshold, the second current threshold and the third current threshold decrease in order.
Example 2
Based on embodiment 1, the specific contents of the first current threshold, the second current threshold, and the third current threshold are as follows:
the first current threshold and the second current threshold are based on the third current threshold.
The third current threshold, which may also be referred to as a disable up-conversion current value, is a reference value for determining whether the compressor is working normally according to the reliability data obtained from the specifications and experimental conditions of each device in the air conditioner.
The second current threshold value can be called as a frequency reduction current value, and in actual life, the second current threshold value is 1.05-1.15 times of the third current threshold value according to different air conditioner specification models, and is used for judging whether the reference value of the running frequency of the compressor is reduced or not.
The first current threshold value can be called as a shutdown current value, and in actual life, according to the difference of air conditioner specification and model, the first current threshold value is 1.25-1.35 times of the third current threshold value, so as to judge a reference value for judging whether to stop the operation of the compressor, and prevent burning out of internal devices of the air conditioner due to overlarge current.
Example 3, as a specific illustration of the process of example 1, is shown in fig. 2;
in the judgment process of step S2 in embodiment 1, for the case where the judgment result is no, that is, when the present current value is greater than or equal to the first current threshold value, the following steps are performed:
s201: and recording the current running frequency of the compressor, and stopping the compressor.
The current running frequency of the compressor is recorded and stored by a memory of the air conditioner, and the air conditioner automatically cuts off a running switch of the compressor after the recording is finished, so that the phenomenon that the air conditioner is burnt out due to overlarge current is avoided.
S202: judging whether the current value is smaller than a fourth current threshold value; if not, continuing to step S202; if yes, go to step S203.
Wherein, in terms of magnitude of the value, the fourth current threshold is smaller than the third current threshold.
Further, the fourth current threshold, which may also be referred to as a release current value, is a preset value, and is set in a specific data form when the air conditioner leaves the factory based on the third current threshold, and is stored in an EEPROM (electrically erasable and programmable read only memory); in actual life, according to different air conditioner specification models, the fourth current threshold is 0.85-0.95 times of the third current threshold, and is used for judging whether the current is recovered to a normal range or not, and is used as a judgment basis for judging whether the current fault is removed or not, so that the air conditioner compressor is ensured to be started under a safe current environment.
S203: the compressor is started.
S204: and (4) ascending the frequency in stages.
Wherein, the step-by-step frequency raising is carried out when the compressor is started after the current value is smaller than the fourth current threshold and the compressor is quitted from the shutdown state, and the specific process comprises the following steps: a normal up-conversion phase and a slow up-conversion phase.
The compressor firstly carries out a normal frequency raising stage, namely, the compressor runs at a normal frequency raising speed; when the air conditioner does not reach the frequency limiting protection and the running frequency of the compressor reaches the rated proportion of the running frequency numerical value recorded in the step S201, a slow frequency increasing stage is carried out;
further, the frequency limiting protection is a current protection process of the air conditioner when the current value of the air conditioner does not reach a first current threshold value, and specifically comprises the steps of forbidding the compressor to increase the frequency and reducing the running frequency of the compressor;
preferably, in actual life, according to different air conditioner specification models, the rated proportion is set to be 75% -85%, and the rated proportion is stored in an EEPROM (electrically erasable programmable read only memory);
the slow ramp-up speed is a rated ramp-up speed, is a preset value, is set in a specific data form when the air conditioner leaves a factory, and is stored in an EEPROM (electrically erasable programmable read only memory).
Example 4, as a specific illustration of the process of example 1, is shown in fig. 2;
in the determination process of step S3 in embodiment 1, when the determination result is negative, that is, when the present current value is greater than or equal to the second current threshold value, the following steps are performed:
s301: and recording the current running frequency of the compressor.
Wherein, the current running frequency of the compressor is recorded and stored by the memory of the air conditioner.
S302: and reducing the frequency by stages.
In the frequency reduction process, in order to control the frequency of the compressor not to generate oscillation and reduce the impact on the electrical performance of internal components of the air conditioner, the compressor is subjected to frequency reduction in stages;
in the staged frequency reduction process, a rated frequency reduction period and a rated frequency reduction point are set, the compressor reduces the frequency at the rated frequency reduction point, and reduces the frequency at the rated frequency reduction point again after one rated frequency reduction period, and the process is repeated until any condition that the running frequency is close to the lowest rated frequency or the current value is smaller than a second current threshold value is met.
The rated frequency reduction period and the rated frequency reduction point are preset values, are set in a specific data form when the air conditioner leaves a factory, and are stored in an EEPROM (electrically erasable programmable read-only memory).
S303: judging whether the running frequency is reduced to the lowest rated frequency or not; if not, go to step S304; if yes, go to step S305.
The lowest rated frequency is the minimum operating frequency of the compressor, is set in a specific data form when the air conditioner leaves a factory, and is stored in an EEPROM (electrically erasable and programmable read only memory).
The lowest rated frequency is set, so that the operation of the compressor is ensured as much as possible and the service state of the air conditioner is maintained under the condition that the current of the air conditioner is greater than or equal to the second current threshold and the internal components of the air conditioner are not damaged.
S304: judging whether the current value is smaller than a second current threshold value; if not, continuing to step S302; if yes, go to step S307.
S305: the compressor is kept running at the lowest rated frequency.
S306: judging whether the current value is smaller than a second current threshold value; if not, continue to step S305; if yes, go to step S307.
S307: the compressor maintains the current frequency operation and inhibits the frequency up-conversion.
S308: judging whether the current value is smaller than a third current threshold value; if not, continue to step S308; if yes, go to step S309.
S309: and (4) ascending the frequency in stages.
The step-by-step frequency rising process of the compressor after the current value is smaller than the third current threshold specifically includes: a normal up-conversion phase and a slow up-conversion phase.
The compressor firstly carries out a normal frequency increasing stage, namely, the compressor runs at a normal frequency increasing speed; when the air conditioner does not reach the frequency limiting protection and the running frequency of the compressor reaches the rated proportion of the running frequency numerical value recorded in the step S301, a slow frequency increasing stage is carried out;
further, the frequency limiting protection is a current protection process of the air conditioner when the current value of the air conditioner does not reach a first current threshold value, and specifically comprises the steps of forbidding the compressor to increase the frequency and reducing the running frequency of the compressor;
preferably, in actual life, according to different air conditioner specification models, the rated proportion is set to be 75% -85%, and the rated proportion is stored in an EEPROM (electrically erasable programmable read only memory);
the slow ramp-up speed is a rated ramp-up speed and a preset value, is set in a specific data form when the air conditioner leaves a factory, and is stored in an EEPROM (electrically erasable programmable read-only memory).
Example 5, as a specific illustration of the process of example 1, is shown in fig. 2;
in the judgment process of step S4 in embodiment 1, for the case where the judgment result is no, that is, when the present current value is greater than or equal to the third current threshold value, the following steps are performed:
s401: keeping the current frequency and forbidding frequency rising.
When the current value is greater than or equal to the third current threshold value, the air conditioner controls the compressor, maintains the current operating frequency, and prohibits the compressor from increasing the frequency.
S402: judging whether the current value is smaller than a third current threshold value; if not, continuing to step S402; if yes, go to step S403.
S403: the compressor resumes normal operation.
According to the embodiment, when the current is abnormal during the operation of the air conditioner, different current thresholds are set for the operation current of the air conditioner, the operation state of the compressor is controlled according to the condition that the actual current value reaches different current thresholds, the current protection effect on the air conditioner is achieved, the condition that the air conditioner is burnt out due to sudden failure of the current is avoided, the operation of the air conditioner is guaranteed to the maximum extent when the current is abnormal, and the use of a user is not influenced.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (9)
1. A control method of an air conditioner, comprising:
s1: detecting the running current of the air conditioner in real time;
s2: judging whether the current value is smaller than a first current threshold value or not; if yes, go to step S3; if not, stopping the compressor and carrying out current protection;
s3: judging whether the current value is smaller than a second current threshold value; if yes, go to step S4; if not, reducing the running frequency of the compressor;
s4: judging whether the current value is smaller than a third current threshold value; if so, the compressor continues to work normally; if not, the compressor keeps the current running frequency and prohibits the frequency increasing;
wherein, in terms of the magnitude of the values, the first current threshold value, the second current threshold value and the third current threshold value are sequentially reduced;
in step S3, when the determination result is negative, that is, when the current value is greater than or equal to the second current threshold value, the following steps are specifically performed:
s301: recording the current running frequency of the compressor;
s302: reducing frequency by stages;
s303: judging whether the running frequency is reduced to the lowest rated frequency or not; if not, go to step S304; if yes, go to step S305;
s304: judging whether the current value is smaller than a second current threshold value; if not, continuing to step S302; if yes, go to step S307;
s305: the compressor keeps running at the lowest rated frequency;
s306: judging whether the current value is smaller than a second current threshold value; if not, continue to step S305; if yes, go to step S307;
s307: the compressor keeps the current frequency running and prohibits the frequency increasing;
s308: judging whether the current value is smaller than a third current threshold value; if not, continue to step S308; if yes, go to step S309;
s309: and (4) ascending the frequency in stages.
2. The method of claim 1, wherein in step S2, when the determination result is negative, that is, when the current value is greater than or equal to the first current threshold value, the following steps are specifically performed:
s201: recording the current running frequency of the compressor, and stopping the compressor;
s202: judging whether the current value is smaller than a fourth current threshold value; if not, continuing to step S202; if yes, go to step S203;
s203: starting the compressor;
s204: frequency is increased in stages;
wherein, in terms of magnitude of the value, the fourth current threshold is smaller than the third current threshold.
3. The method as claimed in claim 2, wherein the step of step S204 includes a normal up-conversion stage and a slow up-conversion stage;
the compressor firstly carries out a normal frequency increasing stage, namely, the compressor runs at a normal frequency increasing speed; and when the air conditioner does not reach the frequency limiting protection and the operating frequency of the compressor reaches the rated proportion of the operating frequency value recorded in the step S201, performing a slow frequency increasing stage.
4. The method as claimed in claim 1, wherein a rated down-conversion period and a rated down-conversion point are set in the step S302, the compressor is down-converted at the rated down-conversion point, and after a rated down-conversion period, the compressor is down-converted at the rated down-conversion point again, and the process is repeated until any one of the condition that the operation frequency is shifted to the lowest rated frequency or the current value is smaller than the second current threshold value is satisfied;
the rated frequency reduction period and the rated frequency reduction point are preset values, are set in a specific data form when the air conditioner leaves a factory, and are stored in an EEPROM (electrically erasable programmable read-only memory).
5. The method as claimed in claim 1, wherein the step of step S309 includes a normal up-conversion stage and a slow up-conversion stage;
the compressor firstly carries out a normal frequency increasing stage, namely, the compressor runs at a normal frequency increasing speed; and when the air conditioner does not reach the frequency limiting protection and the operating frequency of the compressor reaches the rated proportion of the operating frequency value recorded in the step S301, performing a slow frequency increasing stage.
6. The method of claim 1, wherein in step S4, when the determination result is negative, that is, when the current value is greater than or equal to the third current threshold value, the following steps are specifically performed:
s401: keeping the current frequency and forbidding frequency rising;
s402: judging whether the current value is smaller than a third current threshold value; if not, continuing to step S402; if yes, go to step S403;
s403: the compressor resumes normal operation.
7. The method as claimed in any one of claims 1 to 6, wherein the first current threshold value, the second current threshold value, the third current threshold value and the fourth current threshold value are preset values, are set in a specific data form when the air conditioner is shipped from a factory, and are stored in an EEPROM (electrically erasable programmable read only memory).
8. The method as claimed in claim 7, wherein the third current threshold is a reference value for determining whether the compressor is normally operated according to specifications of each device in the air conditioner and experimental conditions.
9. The control method of the air conditioner according to claim 8, wherein the first current threshold is 1.25 to 1.35 times of the third current threshold, and is used as a reference value for judging whether to stop the operation of the compressor, so as to prevent the burning out of the internal devices of the air conditioner due to excessive current;
the second current threshold is 1.05-1.15 times of the third current threshold and is used for judging whether the reference value of the running frequency of the compressor is reduced or not;
the fourth current threshold is 0.85-0.95 times of the third current threshold, and is used for judging whether the current is recovered to a normal range or not, and the fourth current threshold is used as a judgment basis for judging whether the current fault is removed or not, so that the air conditioner compressor is ensured to be started under a safe current environment.
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