CN111980904B - Refrigeration equipment and step-out detection system and method for compressor of refrigeration equipment - Google Patents
Refrigeration equipment and step-out detection system and method for compressor of refrigeration equipment Download PDFInfo
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- CN111980904B CN111980904B CN202010795057.0A CN202010795057A CN111980904B CN 111980904 B CN111980904 B CN 111980904B CN 202010795057 A CN202010795057 A CN 202010795057A CN 111980904 B CN111980904 B CN 111980904B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
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Abstract
The invention discloses a refrigeration device and a system and a method for detecting step loss of a compressor of the refrigeration device, and relates to the field of refrigeration devices, wherein the system comprises: the device comprises a compressor exhaust temperature detection device, a compressor driving module, a control module, a step-out detection module and a compressor; the temperature signal receiving end of the step-out detection module is connected with the compressor exhaust temperature detection device, and the control end of the step-out detection module is connected with the controlled end of the control module; the out-of-step detection module is configured to: acquiring the rotating speed variation and the exhaust temperature variation of the compressor in a preset time period; judging whether the rotating speed variation and the exhaust temperature variation meet a preset variation threshold condition or not; and if so, judging that the compressor is in the out-of-step state. Through the scheme, the accuracy and the reliability of the step-out fault detection of the compressor can be further improved.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to refrigeration equipment, and a system and a method for detecting step-out of a compressor of the refrigeration equipment.
Background
The main principle of the variable frequency air conditioner is that the change of the rotation frequency of a compressor is realized by controlling the change of the period through a control signal. The nature of inverter air conditioner compressors is a position sensorless permanent magnet synchronous motor which is prone to out-of-step faults in the event of excessive loads or improper control. If the compressor is in the out-of-step state for a long time, the air conditioner can not normally refrigerate and heat, and when the compressor is not controlled properly, the compressor can be in the out-of-step state, and a winding of the compressor can generate heat, so that the compressor is burnt.
For reducing the condition appearance that the air conditioner can't normally refrigerate, heat and burn out the compressor because of the out of step state causes, prior art has proposed the following technical scheme that detects the out of step state based on the motor control angle:
1) detecting motor current, extracting an alternating current component of q-axis current, and detecting step loss if the alternating current component exceeds a set threshold;
2) detecting an output voltage vector, and detecting step loss if the voltage vector is smaller than a set threshold;
3) and comparing the calculated counter potential with a theoretical value, and reporting the step-out fault when the calculated counter potential exceeds a protection threshold value.
However, the prior art has the following defects: because the compressor belongs to the control without a position sensor, a designer needs to estimate the position of the rotor in advance, and the technical experience of different designers has great difference, the estimation on the position and the rotating speed of the rotor of the compressor is not accurate enough, so that the step-out fault detection of the compressor is not accurate enough, and even the risk of missing detection can occur.
Disclosure of Invention
The invention provides refrigeration equipment, and a compressor step-out detection system and method for the refrigeration equipment, which can reduce the risk of missing detection in step-out fault detection and further improve the accuracy and reliability of step-out detection of a compressor.
An embodiment of the present invention provides a step-out detection system for a compressor of a refrigeration apparatus, including: the device comprises a compressor exhaust temperature detection device, a compressor driving module, a control module, a step-out detection module and a compressor;
the temperature signal receiving end of the step-out detection module is connected with the compressor exhaust temperature detection device, and the control end of the step-out detection module is connected with the controlled end of the control module;
the current detection end of the control module is connected with the current output end of the compressor driving module, the control end of the control module is connected with the controlled end of the compressor driving module, and the current detection signal output end of the control module is connected with the rotating speed estimation end of the step-out detection module;
the current output end of the compressor driving module is connected with the compressor;
the out-of-step detection module is configured to:
acquiring the rotating speed variation and the exhaust temperature variation of the compressor in a preset time period;
judging whether the rotating speed variation and the exhaust temperature variation meet a preset variation threshold condition or not;
and if so, judging that the compressor is in the out-of-step state.
As an improvement of the above scheme, the out-of-step detection module includes:
and the rotating speed estimation end of the rotor position and rotating speed estimation unit is connected with the current detection signal output end of the control module and is used for:
acquiring a current signal detected by the control module, estimating the rotating speed of the compressor according to the current signal, and sending the rotating speed to the step-out judging unit; and a process for the preparation of a coating,
the step-out judging unit is connected with the compressor exhaust temperature detection device at a temperature signal receiving end, and connected with the rotating speed signal output end of the rotor position and rotating speed estimating unit at a rotating speed signal receiving end, and is used for:
controlling a timer to time, and acquiring the current first rotating speed and the current first exhaust temperature of the compressor;
when the timing duration of the timer reaches a preset duration threshold, acquiring a current second rotating speed and a current second exhaust temperature of the compressor;
and obtaining the rotation speed variation of the compressor by making a difference between the second rotation speed and the first rotation speed, and obtaining the exhaust temperature variation of the compressor by making a difference between the second exhaust temperature and the second exhaust temperature.
As an improvement of the scheme, the control module is a variable frequency vector control module, and the refrigeration equipment is variable frequency refrigeration equipment.
As an improvement of the above, the step-out judging unit is further configured to:
and when the rotating speed variation and the exhaust temperature variation do not meet the preset variation threshold condition, resetting the timer, and controlling the timer again to time.
As a refinement of the above aspect, the change amount threshold condition includes at least one of:
when the rotation speed variation meets a rotation speed constant condition, the ratio of the exhaust temperature variation to the preset time period is less than or equal to a preset first ratio threshold;
when the rotating speed variation meets the rotating speed increasing condition, the exhaust temperature variation is smaller than or equal to a preset exhaust temperature variation threshold;
and when the rotating speed variation meets the rotating speed reduction condition, the ratio of the exhaust temperature variation to the preset time period is less than or equal to a preset second ratio threshold.
Another embodiment of the present invention correspondingly provides a refrigeration device, which includes the above-mentioned step-out detection system for a compressor of the refrigeration device.
The invention correspondingly provides a step-out detection method for a compressor of refrigeration equipment, which comprises the following steps:
acquiring the rotating speed variation and the exhaust temperature variation of the compressor in a preset time period;
judging whether the rotating speed variation and the exhaust temperature variation meet a preset variation threshold condition or not;
and if so, judging that the compressor is in the out-of-step state.
As an improvement of the above scheme, the acquiring a rotation speed variation and an exhaust temperature variation of the compressor in a preset time period includes:
controlling a timer to time, and acquiring the current first rotating speed and the current first exhaust temperature of the compressor;
when the timing duration of the timer reaches a preset duration threshold, acquiring a current second rotating speed and a current second exhaust temperature of the compressor;
and obtaining the rotation speed variation of the compressor by making a difference between the second rotation speed and the first rotation speed, and obtaining the exhaust temperature variation of the compressor by making a difference between the second exhaust temperature and the second exhaust temperature.
As an improvement of the above scheme, when the rotation speed variation and the exhaust temperature variation do not meet a preset variation threshold condition, the timer is cleared, the control timer is returned to count time, and the current first rotation speed and the current first exhaust temperature of the compressor are obtained.
As a refinement of the above, the variation threshold condition includes at least one of:
when the rotating speed variation meets a rotating speed constant condition, the ratio of the exhaust temperature variation to the preset time period is smaller than or equal to a preset first ratio threshold;
when the rotating speed variation meets the rotating speed increasing condition, the exhaust temperature variation is smaller than or equal to a preset exhaust temperature variation threshold;
and when the rotating speed variation meets the rotating speed reduction condition, the ratio of the exhaust temperature variation to the preset time period is less than or equal to a preset second ratio threshold.
Compared with the prior art, the refrigeration equipment, the step-out detection system of the compressor used for the refrigeration equipment and the method have the advantages that: after continuous experiments and intensive researches, the inventor finds that the rotating speed and the exhaust temperature of the compressor are abnormal when the compressor is out of step, and therefore, the inventor thinks through continuous practice and creative work that: the method comprises the steps of obtaining the rotating speed variation and the exhaust temperature variation of a compressor in a preset time period; judging whether the rotating speed variation and the exhaust temperature variation meet a preset variation threshold condition or not; and if so, judging that the compressor is in the out-of-step state. Therefore, the embodiment of the invention judges whether the compressor is out of step or not by combining the rotating speed variation of the compressor and the exhaust temperature variation of the compressor, and can accurately judge whether the compressor is out of step or not, thereby solving the problems of inaccurate detection of the compressor out of step fault and even missing detection risk caused by inaccurate estimation of the position and the rotating speed of the rotor of the compressor due to the technical experience difference of related personnel in the prior art, and improving the accuracy and the reliability of the out of step detection of the compressor.
Drawings
Fig. 1 is a schematic structural diagram of a step-out detection system for a compressor of a refrigeration apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a step-out detection system for a compressor of a refrigeration appliance according to another embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for detecting step loss of a compressor of a refrigeration appliance according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a step-out detection method for a compressor of a refrigeration apparatus according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic structural diagram of a step-out detection system for a compressor of a refrigeration apparatus according to an embodiment of the present invention is shown.
The out-of-step detection system for a compressor of a refrigeration appliance includes: the device comprises a step-out detection module 1, a control module 2, a compressor driving module 3, a compressor exhaust temperature detection device 4 and a compressor 5;
the temperature signal receiving end of the step-out detection module 1 is connected with the compressor exhaust temperature detection device 4, and the control end of the step-out detection module 1 is connected with the controlled end of the control module 2;
the current detection end of the control module 2 is connected with the current output end of the compressor driving module 3, the control end of the control module is connected with the controlled end of the compressor driving module 3, and the current detection signal output end of the control module is connected with the rotating speed estimation end of the step-out detection module 1;
the current output end of the compressor driving module 3 is connected with the compressor 5;
the step-out detection module 1 is configured to:
acquiring the rotating speed variation and the exhaust temperature variation of the compressor in a preset time period;
judging whether the rotating speed variation and the exhaust temperature variation meet a preset variation threshold condition or not;
and if so, judging that the compressor is in the out-of-step state.
In the present embodiment, the compressor discharge temperature detection device 4 is installed at the discharge port of the compressor 5, and is used for detecting the discharge temperature of the compressor and sending the detected discharge temperature of the compressor to the step-out detection module 1; the control module 2 detects the power supply current of the compressor driving module 3, feeds the detected current signal back to the step-out detection module 1, and the step-out detection module 1 estimates the position and the rotating speed of the compressor rotor according to the received current signal to obtain a rotating speed value. The setting principle of the preset variable quantity condition is specifically set according to three conditions of compressor desynchronization, wherein the three conditions of compressor desynchronization specifically comprise: (1) after the compressor is out of step, no rotating magnetic field exists, and the rotor of the compressor does not rotate; (2) after the compressor is out of step, the rotor of the motor of the compressor is locked, but the stator has a rotating magnetic field; (3) and after the compressor is out of step, the motor of the compressor rotates reversely. All the three conditions can cause the compressor to be incapable of working normally, and understandably, when the three conditions occur, the refrigeration equipment stops refrigerating, and the temperature of the exhaust gas of the compressor is greatly reduced along with the refrigeration equipment. Therefore, the present inventors have come to think, through constant practice and inventive work: the method comprises the steps of obtaining the rotating speed variation and the exhaust temperature variation of a compressor in a preset time period; judging whether the rotating speed variation and the exhaust temperature variation meet a preset variation threshold condition or not; and if so, judging that the compressor is in the out-of-step state. Therefore, the embodiment of the invention judges whether the compressor is out of step or not by combining the rotating speed variation of the compressor and the exhaust temperature variation of the compressor, and can accurately judge whether the compressor is out of step or not, thereby solving the problems of inaccurate detection of the compressor out of step fault and even missing detection risk caused by inaccurate estimation of the position and the rotating speed of the rotor of the compressor due to the technical experience difference of related personnel in the prior art, and improving the accuracy and the reliability of the out of step detection of the compressor.
Referring to fig. 2, a schematic structural diagram of a step-out detection system for a compressor of a refrigeration apparatus according to another embodiment of the present invention is shown.
Therein, as an example, the out-of-step detection module 1 includes: rotor position and rotational speed estimation section 102 and step-out determination section 101. A rotor position and rotation speed estimation unit 102, the rotation speed estimation end of which is connected with the current detection signal output end of the control module 2; and a step-out judging unit 101, a temperature signal receiving end of which is connected with the compressor exhaust temperature detecting device 5, and a rotating speed signal receiving end of which is connected with a rotating speed signal output end of the rotor position and rotating speed estimating unit 102.
As an example, the control module 2 comprises: current detection section 201, motor vector control section 202, and PWM drive section 203. A current detection unit 201, a current detection end of which is connected to a current output end of the compressor driving module 3, and a current detection signal output end of which is connected to a rotation speed estimation end of the step-out detection module 1 and a signal input end of the motor vector control unit 202, respectively; the control end of the motor vector control unit 202 is connected with the controlled end of the PWM driving unit 203; the control end of the PWM driving unit 203 is connected to the controlled end of the compressor driving module 3.
The current output of the compressor drive module 3 is connected to the compressor 5.
In this embodiment, the control module 2 is a variable frequency vector control module, and the refrigeration equipment is variable frequency refrigeration equipment.
The working principle of the embodiment is as follows: the compressor exhaust temperature detection device 5 acquires a first exhaust temperature and a second exhaust temperature and forwards the first exhaust temperature and the second exhaust temperature to the step-out judgment unit 101; the rotor position and rotation speed estimation unit 102 obtains a first rotation speed and a second rotation speed, specifically, the rotor position and rotation speed estimation unit 102 calculates a rotor position error according to the current signal sent by the current detection unit 201 and a prestored inductance parameter of the compressor, estimates the rotation speed of the compressor according to the rotor position error to obtain the first rotation speed and the second rotation speed, and sends the first rotation speed and the second rotation speed to the step-out determination unit 101.
The out-of-step judging unit 101 controls a preset timer to time, and obtains a current first rotating speed and a current first exhaust temperature of the compressor; when the timing duration of the timer reaches a preset duration threshold, acquiring a current second rotating speed and a current second exhaust temperature of the compressor;
the step-out judging unit 101 performs a difference between the second rotation speed and the first rotation speed to obtain a rotation speed variation of the compressor, performs a difference between the second exhaust temperature and the second exhaust temperature to obtain an exhaust temperature variation of the compressor, and judges whether the compressor is in a step-out state according to whether the rotation speed variation and the exhaust temperature variation meet a preset variation threshold condition;
wherein, for example, the variation threshold condition includes:
and when the rotating speed variation meets a rotating speed constant condition, the ratio of the exhaust temperature variation to the preset time period is less than or equal to a preset first ratio threshold.
It can be understood that when the rotation speed is constant, whether the compressor is in the out-of-step state is judged by judging whether the exhaust temperature is greatly reduced, that is, the ratio of the exhaust temperature variation to the preset time period is smaller than or equal to a preset first ratio threshold, that is, Δ T/. DELTA.t is smaller than or equal to K1, wherein the first ratio threshold K1 is a negative number.
As another example, or further, the change threshold condition includes: and when the rotating speed variation meets the rotating speed increasing condition, the exhaust temperature variation is smaller than or equal to a preset exhaust temperature variation threshold value.
It is understood that, when the rotation speed increase condition is satisfied, the rotation speed is in a non-constant state, and the rotation speed variation amount is a positive number. When the rotating speed of the compressor is increased and the exhaust temperature of the compressor is reduced, the compressor can be judged to be in a step-out state, namely when delta f is larger than 0, delta T is smaller than 0.
As another example, or further, when the rotation speed variation satisfies the rotation speed reduction condition, the ratio of the exhaust temperature variation to the preset time period is smaller than or equal to a preset second ratio threshold.
It is understood that, when the rotation speed reduction condition is satisfied, the rotation speed is in a non-constant state, and the amount of change in the rotation speed is a negative number. When the rotating speed of the compressor is reduced, the compressor is determined to be in a step-out state by judging that the ratio of the exhaust temperature variation to the preset time period is smaller than or equal to a preset second ratio threshold value, namely delta T/delta T is smaller than or equal to K2, wherein the second ratio threshold value K2 is a negative number.
When the above at least one condition is satisfied, it is determined that the compressor is in the out-of-step state, and the out-of-step determining unit 101 sends a protection signal to the control module 2. After receiving the protection signal, the control module 2 immediately blocks the PWM output, at this time, the PWM driving unit 203 stops outputting the driving signal, and the control compressor driving module 3 stops outputting the voltage to the compressor 4, so that the compressor 4 stops working, thereby protecting the compressor.
The step-out detection system for the compressor of the refrigeration equipment provided by the embodiment has the following beneficial effects compared with the traditional step-out detection: the traditional step-out detection is mainly based on a motor control theory, and the synchronous work of the compressor is recovered from the angle of motor control; the method provided by the embodiment of the invention detects the step-out state of the compressor based on the exhaust temperature variation of the compressor in the operation process of the refrigeration equipment on the basis of the motor control theory, can solve the problems of inaccurate estimation of the position and the rotating speed of the rotor of the compressor caused by the technical experience difference of designers in the prior art, and can solve the problems of inaccurate detection of the step-out fault of the compressor and even the occurrence of the missing detection risk caused by inaccurate application design of the electrode control theory in the prior art, and can further improve the accuracy and the reliability of the step-out detection of the compressor by adding the exhaust temperature variation in the operation process as the detection parameter standard.
The embodiment of the invention also provides a refrigeration device, and the refrigeration device adopts the step-out detection system of the compressor for the refrigeration device. The refrigerating equipment can be but is not limited to variable frequency air conditioners and fixed frequency air conditioners.
An embodiment of the present invention further provides a step-out detection method for a compressor of a refrigeration apparatus, and referring to fig. 3, the step-out detection method is a schematic flow chart of the step-out detection method for a compressor of a refrigeration apparatus according to an embodiment of the present invention.
The compressor step-out detection method for the refrigeration equipment comprises the following steps:
s1, acquiring the rotating speed variation and the exhaust temperature variation of the compressor in a preset time period;
s2, judging whether the rotation speed variation and the exhaust temperature variation meet a preset variation threshold condition;
and S3, if yes, judging that the compressor is in the out-of-step state.
According to the step-out detection method provided by the embodiment, whether the compressor is in the step-out state or not is judged by adding whether the exhaust temperature variation in the operation process of the compressor meets the preset threshold condition or not, so that the accuracy and reliability of the step-out detection of the compressor are improved.
In this embodiment, step S2 specifically includes:
s201, controlling a timer to time, and acquiring a current first rotating speed and a current first exhaust temperature of the compressor;
s202, when the timing duration of the timer reaches a preset duration threshold, acquiring the current second rotating speed and second exhaust temperature of the compressor;
s203, obtaining the rotation speed variation of the compressor by differentiating the second rotation speed and the first rotation speed, and obtaining the exhaust temperature variation of the compressor by differentiating the second exhaust temperature and the second exhaust temperature.
Further, after step S3, the method further includes the steps of:
and S4, when the rotating speed variation and the exhaust temperature variation do not meet the preset variation threshold condition, clearing the timer, returning to the control timer for timing, and acquiring the current first rotating speed and the current first exhaust temperature of the compressor.
In step S2, the variation preset condition includes at least one of:
when the rotating speed variation meets a rotating speed constant condition, the ratio of the exhaust temperature variation to the preset time period is smaller than or equal to a preset first ratio threshold;
when the rotating speed variation meets the rotating speed increasing condition, the exhaust temperature variation is smaller than or equal to a preset exhaust temperature variation threshold;
and when the rotating speed variation meets the rotating speed reduction condition, the ratio of the exhaust temperature variation to the preset time period is less than or equal to a preset second ratio threshold.
According to the embodiment of the invention, whether the compressor is out of step is judged by combining the rotating speed variation of the compressor and the exhaust temperature variation of the compressor, so that whether the compressor is out of step can be accurately judged, and the accuracy and reliability of out-of-step detection of the compressor are improved.
Fig. 4 is a schematic flow chart of a method for detecting step loss of a compressor of a refrigeration apparatus according to another embodiment of the present invention.
The step-out detection module 2 starts to control a timer to time, and obtains a current first rotating speed and a current first exhaust temperature of the compressor; when the timing duration of the timer reaches a preset duration threshold, acquiring a current second rotating speed and a current second exhaust temperature of the compressor;
and obtaining the rotation speed variation of the compressor by making a difference between the second rotation speed and the first rotation speed, and obtaining the exhaust temperature variation of the compressor by making a difference between the second exhaust temperature and the second exhaust temperature.
Further, whether the rotating speed variation and the exhaust temperature variation meet a preset variation threshold condition is judged:
firstly, judging whether the rotating speed is constant, wherein the judging condition of the rotating speed being constant can be any one of the following conditions:
(1) judging whether the rotating speed variation is equal to 0 within the preset time length threshold, namely? "; if Δ f ≠ 0, it is determined that the rotation speed is constant;
(2) judging whether the rotating speed variation is in a symmetrical interval about 0 or not within the preset time length threshold, namely judging whether the absolute value of the rotating speed variation is smaller than a specific rotating speed variation threshold Deltafo(wherein. DELTA.f)o>0) I.e., "| Δ f |<△foIs there a "; if |. DELTA.f-<△foIf the rotation speed is constant, the rotation speed is judged to be constant, and if the value of the delta f is more than or equal to the value of the delta foIf so, the rotation speed is determined to be not constant.
When the rotating speed is judged to be in a constant condition, judging that the ratio of the exhaust temperature variation to the preset time period is smaller than or equal to a preset first ratio threshold value, namely delta T/delta T is smaller than or equal to K1, wherein K1 is a negative number; if so, judging that the compressor is in an out-of-step state;
when the rotation speed is determined not to be in the constant condition, the compressor is determined to be in the out-of-step state when the exhaust temperature variation satisfies any one of the following conditions:
when the variation of the rotating speed is positive and the variation of the exhaust temperature is negative, namely delta f is more than 0, delta T is less than 0;
or when the rotating speed variation is a negative number, the ratio of the exhaust temperature variation to the preset time period is smaller than or equal to a preset second ratio threshold, namely Δ T/Δ T is smaller than or equal to K2, wherein K2 is a negative number.
As an example, the preset time period is set to 10s, the first ratio threshold is set to-5 deg.C, and the second ratio threshold is set to-10 deg.C.
And when the compressor is judged not to be in the out-of-step state, clearing the timer, returning to the control timer for timing, and acquiring the current first rotating speed and the current first exhaust temperature of the compressor.
The detection method provided by the embodiment can further improve the accuracy and reliability of the out-of-step detection.
In summary, the invention designs the refrigeration equipment and the compressor step-out detection system and method used for the refrigeration equipment, so as to solve the problems of inaccurate compressor step-out fault detection and even missing detection risks caused by inaccurate estimation of the position and the rotating speed of the compressor rotor due to the technical experience difference of related personnel in the prior art, and improve the accuracy and the reliability of the compressor step-out detection.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A step loss detection system for a compressor of a refrigeration appliance, comprising: the device comprises a compressor exhaust temperature detection device, a compressor driving module, a control module, a step-out detection module and a compressor;
the temperature signal receiving end of the step-out detection module is connected with the compressor exhaust temperature detection device, and the control end of the step-out detection module is connected with the controlled end of the control module;
the current detection end of the control module is connected with the current output end of the compressor driving module, the control end of the control module is connected with the controlled end of the compressor driving module, and the current detection signal output end of the control module is connected with the rotating speed estimation end of the step-out detection module;
the current output end of the compressor driving module is connected with the compressor;
the out-of-step detection module is configured to:
acquiring the rotating speed variation and the exhaust temperature variation of the compressor in a preset time period;
judging whether the rotating speed variation and the exhaust temperature variation meet a preset variation threshold condition or not;
if so, judging that the compressor is in an out-of-step state;
wherein the variation threshold condition comprises at least one of:
when the rotating speed variation meets a rotating speed constant condition, the ratio of the exhaust temperature variation to the preset time period is smaller than or equal to a preset first ratio threshold;
when the rotating speed variation meets the rotating speed increasing condition, the exhaust temperature variation is smaller than or equal to a preset exhaust temperature variation threshold;
and when the rotating speed variation meets the rotating speed reduction condition, the ratio of the exhaust temperature variation to the preset time period is less than or equal to a preset second ratio threshold.
2. The out-of-step detection system for a compressor of a refrigeration appliance of claim 1, wherein the out-of-step detection module comprises:
and the rotating speed estimation end of the rotor position and rotating speed estimation unit is connected with the current detection signal output end of the control module and is used for:
acquiring a current signal detected by the control module, estimating the rotating speed of the compressor according to the current signal, and sending the rotating speed to the step-out judging unit; and a process for the preparation of a coating,
the step-out judging unit is connected with the compressor exhaust temperature detection device at a temperature signal receiving end, and connected with the rotating speed signal output end of the rotor position and rotating speed estimating unit at a rotating speed signal receiving end, and is used for:
controlling a timer to time, and acquiring the current first rotating speed and the current first exhaust temperature of the compressor;
when the timing duration of the timer reaches a preset duration threshold, acquiring a current second rotating speed and a current second exhaust temperature of the compressor;
and obtaining the rotation speed variation of the compressor by making a difference between the second rotation speed and the first rotation speed, and obtaining the exhaust temperature variation of the compressor by making a difference between the second exhaust temperature and the second exhaust temperature.
3. The step-out detection system for a compressor of a refrigeration appliance according to claim 2, wherein the control module is a variable frequency vector control module and the refrigeration appliance is a variable frequency refrigeration appliance.
4. The system of claim 2, wherein the out-of-step determining unit is further configured to:
and when the rotating speed variation and the exhaust temperature variation do not meet the preset variation threshold condition, resetting the timer, and controlling the timer again to time.
5. Refrigeration appliance, characterized in that it comprises a step-out detection system for a compressor of a refrigeration appliance according to any one of claims 1 to 4.
6. A method for detecting step loss in a compressor of a refrigeration appliance, comprising:
acquiring the rotating speed variation and the exhaust temperature variation of the compressor in a preset time period;
judging whether the rotating speed variation and the exhaust temperature variation meet a preset variation threshold condition or not;
if so, judging that the compressor is in an out-of-step state;
wherein the variation threshold condition comprises at least one of:
when the rotating speed variation meets a rotating speed constant condition, the ratio of the exhaust temperature variation to the preset time period is smaller than or equal to a preset first ratio threshold;
when the rotating speed variation meets the rotating speed increasing condition, the exhaust temperature variation is smaller than or equal to a preset exhaust temperature variation threshold;
and when the rotating speed variation meets the rotating speed reduction condition, the ratio of the exhaust temperature variation to the preset time period is less than or equal to a preset second ratio threshold.
7. The step-out detection method for the compressor of the refrigeration equipment as recited in claim 6, wherein the obtaining of the variation of the rotation speed and the variation of the discharge temperature of the compressor in the preset time period comprises:
controlling a timer to time, and acquiring the current first rotating speed and the current first exhaust temperature of the compressor;
when the timing duration of the timer reaches a preset duration threshold, acquiring the current second rotating speed and second exhaust temperature of the compressor;
and obtaining the rotation speed variation of the compressor by making a difference between the second rotation speed and the first rotation speed, and obtaining the exhaust temperature variation of the compressor by making a difference between the second exhaust temperature and the second exhaust temperature.
8. The method of detecting step loss of a compressor for a refrigeration appliance according to claim 7, further comprising:
and when the rotating speed variation and the exhaust temperature variation do not meet the preset variation threshold condition, clearing the timer, returning to the control timer for timing, and acquiring the current first rotating speed and the current first exhaust temperature of the compressor.
Priority Applications (1)
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| CN105805976A (en) * | 2016-04-27 | 2016-07-27 | 广东美的暖通设备有限公司 | Air conditioner operation control method and device |
| CN110895019B (en) * | 2018-09-12 | 2021-03-12 | 奥克斯空调股份有限公司 | Air conditioner refrigerant leakage detection method and air conditioner using same |
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