CN104122463B - Method and system for detecting electronic expansion valve - Google Patents
Method and system for detecting electronic expansion valve Download PDFInfo
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- CN104122463B CN104122463B CN201410338939.9A CN201410338939A CN104122463B CN 104122463 B CN104122463 B CN 104122463B CN 201410338939 A CN201410338939 A CN 201410338939A CN 104122463 B CN104122463 B CN 104122463B
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- expansion valve
- electric expansion
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Abstract
The invention discloses a method and system for detecting an electronic expansion valve. The method comprises the steps of detecting a first pressure value of a corresponding electrical device when the opening of the electronic expansion valve is a first opening value after the electrical device where the electronic expansion valve is installed is switched to a refrigeration mode; controlling the electronic expansion valve to close to a second opening value and detecting a second pressure value of the corresponding electrical device when the opening of the electronic expansion valve is the second opening value; and judging whether the electronic expansion valve is normal according to the first pressure value and the second pressure value. According to the method, whether the electronic expansion valve is normal is judged according to the first pressure value of the corresponding electrical device when the electronic expansion valve is in an opened state and the second pressure value of the corresponding electrical device when the electronic expansion valve is in a closed state. Simultaneous detection of opening motions and closing motions of the electronic expansion valve is achieved. The problems that the closing motions of the electronic expansion valve cannot be detected in the prior art and effectiveness of electronic expansion valve detection cannot be achieved are effectively solved.
Description
Technical field
The present invention relates to Electrical Testing field, more particularly to a kind of electric expansion valve detection method and system.
Background technology
Electric expansion valve, as a kind of throttle structure of air-conditioner, has been widely used in various domestic variable frequency air-conditionings
Device.The stability of the part that the stability that air-conditioner runs is made up of it to a certain extent determines.And electric expansion valve conduct
A kind of constituent part of air-conditioner, due to after sale using there is larger fault rate, therefore largely affecting air-conditioner
Stable operation.
Affect the problem of the stable operation of air-conditioner for above-mentioned electric expansion valve, it usually needs electric expansion valve is carried out
Detect it is ensured that the electric expansion valve being arranged on air-conditioner is functional, to ensure the stable operation of air-conditioner.
Currently for the detection of electric expansion valve, generally the electricity to electric expansion valve for the frock is opened using electric expansion valve
Electricity on magnetic coil, opens electric expansion valve to carry out electronics swollen so that electric expansion valve is in full open position thus mandatory
The detection of swollen valve.But, this detection method can only detect whether electric expansion valve is capable of breakdown action it is impossible to detect electronics
The closing motion of expansion valve, and then do not enable the effectiveness of electric expansion valve detection.
Content of the invention
Based on this it is necessary to the closing motion of electric expansion valve can not be detected for existing electric expansion valve detection, enter
And do not enable electric expansion valve detection effectiveness problem, a kind of electric expansion valve detection method and system are provided.
For realizing a kind of electric expansion valve detection method of the object of the invention offer, comprise the steps:
After the electrical equipment being provided with electric expansion valve switches to refrigeration mode, detect the aperture of described electric expansion valve
First pressure value for described electrical equipment corresponding during the first opening value；
Control described electric expansion valve to close to the second opening value, and detect that the aperture of described electric expansion valve is described the
The second pressure value of corresponding described electrical equipment during two opening values；
According to described first pressure value and described second pressure value, judge whether described electric expansion valve is normal；
Wherein, described second opening value is less than described first opening value.
Wherein in an embodiment, described according to described first pressure value with described second pressure value, judge described electricity
Whether sub- expansion valve is normal, comprises the steps:
Judge described second pressure value whether less than or equal to the 85% of described first pressure value；
When described second pressure value is less than or equal to the 85% of described first pressure value, described electric expansion valve is normal；
When described second pressure value is more than the 85% of described first pressure value, described electric expansion valve is abnormal.
Wherein in an embodiment, also comprise the steps:
When described electric expansion valve is normal, the aperture of described electric expansion valve is controlled to recover to described first opening value.
Wherein in an embodiment, described after the electrical equipment being provided with electric expansion valve switches to refrigeration mode,
The aperture detecting described electric expansion valve is the first pressure value of corresponding described electrical equipment during the first opening value, including as follows
Step:
After described electrical equipment switches to described refrigeration mode, the aperture recording described electric expansion valve is described first
Opening value；
After described electrical equipment switches to described refrigeration mode the first Preset Time, detect opening of described electric expansion valve
Spend the described first pressure value for described electrical equipment corresponding during described first opening value；
Wherein, the value of described first Preset Time is 30s.
Wherein in an embodiment, described control electric expansion valve is closed to the second opening value, comprises the steps:
Input electronic expansion valve opening fixed value is to the control chip of described electrical equipment；
The control chip of described electrical equipment, according to described electronic expansion valve opening fixed value, controls described electric expansion valve
Close to described second opening value；
Wherein, described electronic expansion valve opening fixed value is 80 steps.
Wherein in an embodiment, control described electric expansion valve to close to the second opening value, comprise the steps:
Input electronic expansion valve opening empirical value is to the control chip of described electrical equipment；
The control chip of described electrical equipment, according to described electronic expansion valve opening empirical value, controls described electric expansion valve
Close to described second opening value；
Wherein, described electronic expansion valve opening empirical value is more than or equal to the 70% of described first opening value, and is less than or equal to
The 90% of described first opening value.
Accordingly, for realizing any of the above-described kind of electric expansion valve detection method, present invention also offers a kind of electronic expansion
Valve detecting system, including detecting tool, described detecting tool is connected with the electrical equipment communication being provided with electric expansion valve；
Described detecting tool includes detection module, control module and judge module；
Described detection module, for, after described electrical equipment switches to refrigeration mode, detecting described electric expansion valve
Aperture is the first pressure value of corresponding described electrical equipment during the first opening value；
Described control module, for controlling described electric expansion valve to close to the second opening value；
Described detection module, is additionally operable to detect that the aperture of described electric expansion valve is institute corresponding during described second opening value
State the second pressure value of electrical equipment；
Described judge module, for according to described first pressure value and described second pressure value, judging described electronic expansion
Whether valve is normal；
Wherein, described second opening value is less than described first opening value.
Wherein in an embodiment, described judge module, for judging whether described second pressure value is less than or equal to
The 85% of described first pressure value；
When described second pressure value is less than or equal to the 85% of described first pressure value, described electric expansion valve is normal；
When described second pressure value is more than the 85% of described first pressure value, described electric expansion valve is abnormal.
Wherein in an embodiment, described control module, it is additionally operable to judge that described electronics is swollen when described judging unit
When swollen valve is normal, the aperture of described electric expansion valve is controlled to recover to described first opening value.
Wherein in an embodiment, described detecting tool also includes logging modle；
Described logging modle, for, after described electrical equipment switches to described refrigeration mode, recording described electronic expansion
The aperture of valve is described first opening value；
Described detection module, for, after described electrical equipment switches to described refrigeration mode the first Preset Time, detecting
The aperture of described electric expansion valve is the described first pressure value of corresponding described electrical equipment during described first opening value；
Wherein, the value of described first Preset Time is 30s.
Wherein in an embodiment, described control module includes the first input module；
Described first input module, for inputting electronic expansion valve opening fixed value to the control chip of described electrical equipment
In；
The control chip of described electrical equipment, according to described electronic expansion valve opening fixed value, controls described electric expansion valve
Close to described second opening value；
Wherein, described electronic expansion valve opening fixed value is 80 steps.
Wherein in an embodiment, described detecting tool also includes the second input module；
Described second input module, for inputting electronic expansion valve opening empirical value to the control chip of described electrical equipment
In；
The control chip of described electrical equipment, according to described electronic expansion valve opening empirical value, controls described electric expansion valve
Close to described second opening value；
Wherein, described electronic expansion valve opening empirical value is more than or equal to the 70% of described first opening value, and is less than or equal to
The 90% of described first opening value.
Wherein in an embodiment, described detection module is pressure transducer；Described pressure transducer is arranged at described
On the pipe laying of electric expansion valve.
Above-mentioned electric expansion valve detection method and the beneficial effect of system: wherein method is passed through the detection of electric expansion valve
It is added in the automatic testing process of electrical equipment, when the electrical equipment being provided with electric expansion valve is cut in automatic testing process
After shifting to refrigeration mode, when now the aperture of electric expansion valve is the first opening value, the first pressure value of detection electrical equipment.So
Control electric expansion valve to close to the second opening value afterwards, and detect electronic expansion in the second opening value, the second of electrical equipment
Pressure value.According to electric expansion valve in the first opening value the first pressure value of electrical equipment and electric expansion valve in the second aperture
The second pressure value of electrical equipment during value, judges whether electric expansion valve is normal.Achieve the detection of electric expansion valve opening action
While, also carry out the detection of electric expansion valve closing motion.Efficiently solving existing electric expansion valve detection can not
The closing motion of detection electric expansion valve, and then do not enable the problem of the effectiveness of electric expansion valve detection.
Brief description
Fig. 1 is electric expansion valve detection method one specific embodiment flow chart；
Fig. 2 is electric expansion valve detection method another specific embodiment flow chart；
Fig. 3 is electric expansion valve detection method still another embodiment flow chart.
Specific embodiment
For making technical solution of the present invention clearer, below in conjunction with drawings and the specific embodiments, the present invention is done detailed further
Describe in detail bright.
Referring to Fig. 1, as the electric expansion valve detection method of a specific embodiment, comprise the steps:
Step s100, after the electrical equipment being provided with electric expansion valve switches to refrigeration mode, detects electric expansion valve
Aperture be corresponding electrical equipment during the first opening value first pressure value.
Step s200, control electric expansion valve close to the second opening value, and detect electric expansion valve aperture be second
The second pressure value of corresponding electrical equipment during opening value.
Step s300, according to first pressure value and second pressure value, judges whether electric expansion valve is normal.
It is by adding to the detection of electric expansion valve in the automatic testing process of electrical equipment, swollen when being provided with electronics
After the electrical equipment of swollen valve switches to refrigeration mode in automatic testing process, the aperture of detection electric expansion valve first is first
The first pressure value of corresponding electrical equipment during opening value.Then electric expansion valve is controlled to close to the second opening value, detection
The second pressure value of electric expansion valve corresponding electrical equipment in the second opening value.Opened first respectively according to electric expansion valve
When angle value and the second opening value, the first pressure value corresponding to electrical equipment and second pressure value, to judge that electric expansion valve is
No normal.While carrying out electric expansion valve opening action (i.e. the aperture of electric expansion valve is the first opening value) detection, also
Achieve the detection of electric expansion valve closing motion (i.e. the aperture of electric expansion valve is the second opening value).Efficiently solve existing
Some electric expansion valve detections can not detect the closing motion of electric expansion valve, and then does not enable having of electric expansion valve detection
The problem of effect property.
Wherein, due to electronic expansion valve opening be the first opening value when, electric expansion valve be full-gear；And electronic expansion
When the aperture of valve is the second opening value, electric expansion valve is close to the state closed, and the therefore second opening value is opened less than first
Angle value.
It should be noted that the electrical equipment being provided with electric expansion valve can be air conditioning system, particularly as follows: the fixed frequency of band communication
Machine (frequency cabinet-type air conditioner is determined in test automatically to contain band communication).When band communication is determined frequency machine and automatically tested, its testing procedure includes:
Step s000, setup test；Step s001, refrigeration test；Step s002, the refrigeration hot power-off of the transformation of ownership；Step s003, heat survey
Examination；Step s004, heat the cold power-off of the transformation of ownership；Step s005, refrigeration test；Step s006, carry out refrigerant recovering；Step s007,
Shut down.
Determine the automatic testing procedure of frequency machine according to the communication of above-mentioned band, determine frequency machine when band communication and enter step s005, refrigeration is surveyed
During examination, band communication determine frequency mechanism lifting/lowering frequency stably after, its corresponding pressure is relatively stable.Therefore, can increase in step s005
Add the detection of electric expansion valve.By opening and closing electric expansion valve, and during according to opening and closing electric expansion valve, electrically
The difference of the pressure of equipment, detects to electric expansion valve.
It, by being embedded into the detection of electric expansion valve in the automatic testing process of electrical equipment, not only achieves electronics
Detect while expansion valve opening action and closing motion, also shorten the detection time of electric expansion valve.Meanwhile, to electrically setting
The detection of standby other specification also will not produce impact, enters without causing electrical equipment to report the problem of fault by mistake.
Referring to Fig. 2 and Fig. 3, it should be noted that by opening and closing electric expansion valve and electric according to opening and closing
During sub- expansion valve, the difference of the pressure of corresponding electrical equipment, detects to electric expansion valve, i.e. step s300, according to electronics
Expansion valve respectively in the first opening value and the second opening value, the first pressure value of corresponding electrical equipment and second pressure value,
Judge whether electric expansion valve is normal, can be judged by the relation between first pressure value and second pressure value.Particularly as follows:
Whether step s310, judge second pressure value less than or equal to the 85% of first pressure value.
Step s320, when judging that second pressure value is less than or equal to the 85% of first pressure value, then electric expansion valve
Normally, the aperture of controllable electric expansion valve is recovered to the first opening value m1 so that electrical equipment enters next test phase, such as
Reclaim etc..
Step s330, when judging that second pressure value is more than the 85% of first pressure value, then electric expansion valve is abnormal, right
Electric expansion valve carries out fault detect, so that electrical equipment enters next test phase after electric expansion valve is normal.
Wherein, when the aperture when electric expansion valve is opened is the first opening value m1, the first of its corresponding electrical equipment
Pressure value is p1.When electric expansion valve is closed to the second opening value m2, the second pressure value of its corresponding electrical equipment is p2.
Because the value of the second opening value m2 is 80 steps, or the value of the second opening value m2 is equal to 85% (the i.e. m2 of the first opening value m1
=0.85m1).Therefore, when electric expansion valve is normal, should there is following relation: p2 in first pressure value p1 and second pressure value p2
≤0.85p1.
Therefore, by judging whether p2 is less than or equal to 0.85p1, as p2≤0.85p1, show electric expansion valve just
Often.Due to carry out in the automatic testing process being detected as be embedded in electrical equipment to electric expansion valve, therefore, when detecting
When electric expansion valve is normal, the aperture of controllable electronic expansion is recovered to the first opening value so that electrical equipment enters next survey
The examination stage.
As p2 > 0.85p1 when, show that electric expansion valve is abnormal.Malfunction elimination can be carried out to electric expansion valve so that electronics
After expansion valve recovers normal, electrical equipment is controlled to enter next test phase.
Referring to Fig. 2 and Fig. 3, when detecting to electric expansion valve, step s100, when the electricity being provided with electric expansion valve
After gas equipment switches to refrigeration mode, when the aperture of detection electric expansion valve is the first opening value, the first pressure of electrical equipment
Value, comprises the steps:
Step s110, after electrical equipment switches to refrigeration mode, the aperture of recorded electronic expansion valve is the first opening value
m1.By the aperture of recorded electronic expansion valve, with ensure electric expansion valve in the first opening value m1 as full-gear.
Step s120, after electrical equipment switches to refrigeration mode the first Preset Time, the aperture of detection electric expansion valve
During for the first opening value m1, first pressure value p1 of electrical equipment.
After electrical equipment switches to refrigeration mode, need to run certain time to frequency reducing final stage, reach operation frequency
After rate is stable, the pressure of electrical equipment also tends to stablize.Now, electric expansion valve still remains the standard-sized sheet of the first opening value m1
State, simultaneously the pressure of electrical equipment be also at steady statue, electric expansion valve can be detected in the first opening value m1 full-gear
When, first pressure value p1 of electrical equipment.Can determine whether out whether electric expansion valve reaches according to first pressure value p1 of electrical equipment
To full-gear, and then realize the detection of the opening action of electric expansion valve.
Wherein, the value of the first Preset Time is 30s.It should be noted that the value of the first Preset Time also dependent on
Practical situation is set, as long as ensureing that, after electrical equipment switches to refrigeration mode, it is in electric expansion valve in the first aperture
During value m1, the pressure of electrical equipment is in steady statue.
First pressure value p1 of corresponding electrical equipment when aperture electric expansion valve is detected is the first opening value m1
Afterwards, need to control electric expansion valve to close to the second opening value m2, with detect electric expansion valve aperture for the second opening value m2
When corresponding electrical equipment second pressure value p2.Thus being carried out by first pressure value p1 and second pressure value p2 detecting
Whether electric expansion valve normally detects.
Control electric expansion valve to close to realize by two ways to the second opening value m2.First, it is real for system test
When record value mode；Second, being empirical value mode.
Referring to Fig. 2, control electric expansion valve to close to the second opening value m2 using system test real time record value mode, have
Body comprises the steps:
Step s210, input electronic expansion valve opening fixed value is to the control chip of electrical equipment.
Step s220, the control chip of electrical equipment, according to electronic expansion valve opening fixed value, controls electric expansion valve to close
Close to the second opening value m2.
Wherein, electronic expansion valve opening fixed value is 80 steps.
It passes through to input electronic expansion valve opening fixed value so that the control of electrical equipment to the control chip of electrical equipment
Chip, according to the electronic expansion valve opening fixed value receiving, controls electric expansion valve to close to the second opening value m2.Wherein, electricity
Sub- expansion valve opening fixed value is 80 steps, thus the control chip of electrical equipment controls electric expansion valve to close to the second opening value
M2 is also 80 steps.Now, electric expansion valve is close to closed mode.
Control electric expansion valve to close to the second opening value m2 in the control chip of electrical equipment, that is, control electric expansion valve
Close to during closed mode, the pressure of electrical equipment is gradually reduced.When the pressure drop of electrical equipment is to steady statue
When, now, the pressure of electrical equipment is second pressure value p2.By detecting second pressure value p2 of now electrical equipment, and with
When electric expansion valve is in the first opening value m1 (i.e. full-gear), the 85% of first pressure value p1 of the electrical equipment detecting
Contrasted.
When second pressure value p2 of the electrical equipment detecting is less than or equal to first pressure value p1 of electrical equipment
When 85% (i.e. p2≤0.85p1), show that electric expansion valve is normal operating conditions.The second pressure when the electrical equipment detecting
When force value p2 is more than 85% (p2 > 0.85p1) of first pressure value p1 of electrical equipment, show that electric expansion valve breaks down, can
Testing staff is pointed out to carry out the trouble shooting of electric expansion valve by modes such as warnings.Ensure that electrical equipment safety and can
By property.
Referring to Fig. 3, control electric expansion valve to close to the second opening value m2 using empirical value mode, specifically include following step
Rapid:
Step s230, input electronic expansion valve opening empirical value is to the control chip of electrical equipment.
Step s240, the control chip of electrical equipment, according to electronic expansion valve opening empirical value, controls electric expansion valve to close
Close to the second opening value m2.
Wherein, electronic expansion valve opening empirical value is more than or equal to the 70% of the first opening value m1, and opens less than or equal to first
The 90% of angle value m1.It is preferably, electronic expansion valve opening empirical value is equal to the 85% of the first opening value m1.
It passes through to input electronic expansion valve opening empirical value so that the control of electrical equipment to the control chip of electrical equipment
Chip, according to the electronic expansion valve opening empirical value receiving, controls electric expansion valve to close to the second opening value m2.Wherein, electricity
Sub- expansion valve opening empirical value is more than or equal to the 70% of the first opening value m1, and 90% less than or equal to the first opening value m1.Excellent
Elect as, equal to the 85% of the first opening value m1.Thus the control chip reaching electrical equipment controls electric expansion valve to close to the
Two opening value m2 are also 85% (i.e. m2=0.85m1) purpose of the first opening value m1.Now, electric expansion valve equally close to
Closed mode.
By detecting second pressure value p2 of now electrical equipment, and it is in the first opening value m1 (i.e. with electric expansion valve
Full-gear) when, the 85% of first pressure value p1 of the electrical equipment detecting is contrasted, and equally achieves electric expansion valve
Whether normal judgement, and then achieve detection while electric expansion valve opening action and closing motion.
Accordingly, for realizing any of the above-described kind of electric expansion valve detection method, present invention also offers a kind of electronic expansion
Valve detecting system.The operation principle of electric expansion valve detecting system being provided due to the present invention and the electronic expansion of present invention offer
Valve detection method principle is same or similar, repeats no more in place of therefore repeating.
As the electric expansion valve detecting system of a specific embodiment, including detecting tool, detecting tool with electricity is installed
The electrical equipment communication of sub- expansion valve connects.
Detecting tool includes detection module, control module and judge module.
Detection module, for, after electrical equipment switches to refrigeration mode, the aperture of detection electric expansion valve is opened for first
The first pressure value of corresponding electrical equipment during angle value.
Control module, for controlling electric expansion valve to close to the second opening value.Wherein, control module can be by electric
The control chip input order signal of equipment is so that the control chip of electrical equipment, according to the command signal receiving, controls electricity
Sub- expansion valve executes corresponding action, finally realizes control module and controls electric expansion valve to close to the purpose of the second opening value.
Detection module, is additionally operable to detect that the aperture of electric expansion valve is second of corresponding electrical equipment during the second opening value
Pressure value.
Judge module, for according to first pressure value and second pressure value, judging whether electric expansion valve is normal.
Wherein, the second opening value is less than the first opening value.
It should be noted that detection module can be pressure transducer.By pressure transducer is arranged at electric expansion valve
Pipe laying on, by detecting the pressure on the pipe laying of electric expansion valve, realize detection electric expansion valve and be respectively the
When one opening value and the second opening value, the purpose of electrical equipment corresponding first pressure value and second pressure value.Simple to operate, and
And cost is relatively low.
Wherein, whether judge module, for judging second pressure value less than or equal to the 85% of first pressure value.
When second pressure value is less than or equal to the 85% of first pressure value, show that electric expansion valve is normal.
When second pressure value is more than the 85% of first pressure value, show that electric expansion valve is abnormal.
Wherein in an embodiment, control module, it is additionally operable to when judging unit judges that electric expansion valve is normal, control
Electric expansion valve processed recovers to the first opening value.
I.e. when judging unit judges that electric expansion valve is normal, then control module can be by the control core to electrical equipment
Piece inputs the command signal of the first opening value, so that the control chip of electrical equipment is according to the first opening value receiving
Command signal, controls electric expansion valve to be recovered to the first opening value by the second opening value, so that electrical equipment normally enters
Next test phase.Ensure that normally automatically testing of electrical equipment.
After electrical equipment switches to refrigeration mode, when the aperture of electric expansion valve is the first opening value, detection module (pressure
Force transducer) detection electrical equipment first pressure value when, detecting tool also includes logging modle.
Logging modle, for, after electrical equipment switches to refrigeration mode, the aperture of recorded electronic expansion valve is opened for first
Angle value.Be the first opening value by the aperture of recorded electronic expansion valve, with detect electric expansion valve whether as full-gear it is ensured that
The aperture of electric expansion valve (first opening value) is full-gear.
Detection module, for, after electrical equipment switches to refrigeration mode the first Preset Time, detecting electric expansion valve
When aperture is the first opening value, the first pressure value of electrical equipment.
Wherein, the value of the first Preset Time is 30s.
As a kind of embodiment, control module includes the first input module.
First input module, for inputting electronic expansion valve opening fixed value to the control chip of electrical equipment.
The control chip of electrical equipment, according to electronic expansion valve opening fixed value, controls electric expansion valve to close and opens to second
Angle value.
Wherein, electronic expansion valve opening fixed value is 80 steps.
I.e. by using system test real time record value mode, switching to refrigeration mode (i.e. step s005) in electrical equipment
Afterwards, detecting tool is connected by being communicated with electrical equipment, by the logging modle record electrical equipment normal condition in detecting tool
Under electric expansion valve the first opening value m1.In electrical equipment frequency reducing final stage, by detection module (pressure after frequency stable
Sensor) detect first pressure value p1 of this moment electrical equipment.
Then input electronics from the first input module in the control module of detecting tool to the control chip of electrical equipment
Expansion valve opening fixed value (80 step) is so that the aperture of electric expansion valve is that (wherein, the second opening value m2 is same for the second opening value m2
Sample is 80 steps) so that the control chip of electrical equipment starts electric expansion valve is controlled action, the pressure of electrical equipment
Power can be gradually reduced.And detected after the pressure level-off of electrical equipment by the detection module (pressure transducer) in detecting tool
Second pressure value p2.
It is believed that electric expansion valve belongs to normal operating conditions when pressure p 2≤0.85p1, the control in detecting tool
Molding block sends the control chip to electrical equipment for the original opening value (i.e. first opening value m1), and electric expansion valve recovers original
Aperture (the first opening value m1), so that electrical equipment enters next testing process, is reclaimed.If pressure cannot meet
P2≤0.85p1 (i.e. p2 > 0.85p1), then detecting tool report electric expansion valve abnormal failure, finally realize electric expansion valve detection
Quick test.
As another kind of embodiment, detecting tool also includes the second input module.
Second input module, for inputting electronic expansion valve opening empirical value to the control chip of electrical equipment.
The control chip of electrical equipment, according to electronic expansion valve opening empirical value, controls electric expansion valve to close and opens to second
Angle value m2.
Wherein, electronic expansion valve opening empirical value is more than or equal to the 70% of the first opening value m1, and opens less than or equal to first
The 90% of angle value m1.
Adopt empirical value mode, after electrical equipment switches to refrigeration mode (i.e. step s005), detecting tool is passed through
It is connected with electrical equipment communication, by the electric expansion valve under the logging modle record electrical equipment normal condition in detecting tool
First opening value m1.In electrical equipment frequency reducing final stage, detected now by detection module (pressure transducer) after frequency stable
Carve first pressure value p1 of electrical equipment.
Then input electronics from the first input module in the control module of detecting tool to the control chip of electrical equipment
Expansion valve opening empirical value (electronic expansion valve opening empirical value is more than or equal to the 70% of the first opening value m1, and less than or equal to the
The 90% of one opening value m1., the 85% of the preferably first opening value m1) so that the aperture of electric expansion valve is the second opening value
M2 (wherein, the second opening value m2 is equal to electronic expansion valve opening empirical value), so that the control chip of electrical equipment starts
Electric expansion valve is controlled with action, the pressure of electrical equipment can be gradually reduced.And by the detection module (pressure in detecting tool
Force transducer) detection electrical equipment pressure level-off after second pressure value p2.
It is believed that electric expansion valve belongs to normal operating conditions when pressure p 2≤0.85p1, the control in detecting tool
Molding block sends the control chip to electrical equipment for the original opening value (i.e. first opening value m1), and electric expansion valve recovers original
Aperture (the first opening value m1), so that electrical equipment enters next testing process, is reclaimed.If pressure cannot meet
P2≤0.85p1 (i.e. p2 > 0.85p1), then detecting tool report electric expansion valve abnormal failure, finally realize electric expansion valve detection
Quick test.
Upper described embodiment only have expressed the several embodiments of the present invention, and its description is more concrete and detailed, but not
Therefore the restriction to the scope of the claims of the present invention can be interpreted as.It should be pointed out that coming for those of ordinary skill in the art
Say, without departing from the inventive concept of the premise, some deformation can also be made and improve, these broadly fall into the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (13)
1. a kind of electric expansion valve detection method is it is characterised in that comprise the steps:
After the electrical equipment being provided with electric expansion valve switches to refrigeration mode, detect that the aperture of described electric expansion valve is the
The first pressure value of corresponding described electrical equipment during one opening value；
Control described electric expansion valve to close to the second opening value, and detect that the aperture of described electric expansion valve is opened for described second
The second pressure value of corresponding described electrical equipment during angle value；
According to described first pressure value and described second pressure value, judge whether described electric expansion valve is normal；
Wherein, described second opening value is less than described first opening value；And
When the aperture of described electric expansion valve is described first opening value, described electric expansion valve is full-gear；
When the aperture of described electric expansion valve is described second opening value, described electric expansion valve is closed mode.
2. electric expansion valve detection method according to claim 1 it is characterised in that described according to described first pressure value
With described second pressure value, judge whether described electric expansion valve is normal, comprises the steps:
Judge described second pressure value whether less than or equal to the 85% of described first pressure value；
When described second pressure value is less than or equal to the 85% of described first pressure value, described electric expansion valve is normal；
When described second pressure value is more than the 85% of described first pressure value, described electric expansion valve is abnormal.
3. electric expansion valve detection method according to claim 2 is it is characterised in that also comprise the steps:
When described electric expansion valve is normal, the aperture of described electric expansion valve is controlled to recover to described first opening value.
4. electric expansion valve detection method according to claim 1 is it is characterised in that described ought be provided with electric expansion valve
Electrical equipment switch to refrigeration mode after, detect described electric expansion valve aperture be the first opening value when corresponding described electricity
The first pressure value of gas equipment, comprises the steps:
After described electrical equipment switches to described refrigeration mode, the aperture recording described electric expansion valve is described first aperture
Value；
After described electrical equipment switches to described refrigeration mode the first Preset Time, detect that the aperture of described electric expansion valve is
The described first pressure value of corresponding described electrical equipment during described first opening value；
Wherein, the value of described first Preset Time is 30s.
5. electric expansion valve detection method according to claim 4 is it is characterised in that described control electric expansion valve is closed
To the second opening value, comprise the steps:
Input electronic expansion valve opening fixed value is to the control chip of described electrical equipment；
The control chip of described electrical equipment, according to described electronic expansion valve opening fixed value, controls described electric expansion valve to close
To described second opening value；
Wherein, described electronic expansion valve opening fixed value is 80 steps.
6. electric expansion valve detection method according to claim 4 is it is characterised in that control described electric expansion valve to close
To the second opening value, comprise the steps:
Input electronic expansion valve opening empirical value is to the control chip of described electrical equipment；
The control chip of described electrical equipment, according to described electronic expansion valve opening empirical value, controls described electric expansion valve to close
To described second opening value；
Wherein, described electronic expansion valve opening empirical value is more than or equal to the 70% of described first opening value, and less than or equal to described the
The 90% of one opening value.
7. a kind of electric expansion valve detecting system it is characterised in that include detecting tool, described detecting tool with electronics is installed
The electrical equipment communication of expansion valve connects；
Described detecting tool includes detection module, control module and judge module；
Described detection module, for, after described electrical equipment switches to refrigeration mode, detecting the aperture of described electric expansion valve
First pressure value for described electrical equipment corresponding during the first opening value；
Described control module, for controlling described electric expansion valve to close to the second opening value；
Described detection module, is additionally operable to detect that the aperture of described electric expansion valve is corresponding described electricity during described second opening value
The second pressure value of gas equipment；
Described judge module, for according to described first pressure value and described second pressure value, judging that described electric expansion valve is
No normal；
Wherein, described second opening value is less than described first opening value；And
When the aperture of described electric expansion valve is described first opening value, described electric expansion valve is full-gear；
When the aperture of described electric expansion valve is described second opening value, described electric expansion valve is closed mode.
8. electric expansion valve detecting system according to claim 7 is it is characterised in that described judge module, for judging
Whether described second pressure value is less than or equal to the 85% of described first pressure value；
When described second pressure value is less than or equal to the 85% of described first pressure value, described electric expansion valve is normal；
When described second pressure value is more than the 85% of described first pressure value, described electric expansion valve is abnormal.
9. electric expansion valve detecting system according to claim 8, it is characterised in that described control module, is additionally operable to work as
When described judge module judges that described electric expansion valve is normal, the aperture of described electric expansion valve is controlled to recover to described first
Opening value.
10. electric expansion valve detecting system according to claim 7 is it is characterised in that described detecting tool also includes remembering
Record module；
Described logging modle, for, after described electrical equipment switches to described refrigeration mode, recording described electric expansion valve
Aperture is described first opening value；
Described detection module, for, after described electrical equipment switches to described refrigeration mode the first Preset Time, detection is described
The aperture of electric expansion valve is the described first pressure value of corresponding described electrical equipment during described first opening value；
Wherein, the value of described first Preset Time is 30s.
11. electric expansion valve detecting systems according to claim 10 are it is characterised in that described control module includes first
Input module；
Described first input module, for inputting electronic expansion valve opening fixed value to the control chip of described electrical equipment；
The control chip of described electrical equipment, according to described electronic expansion valve opening fixed value, controls described electric expansion valve to close
To described second opening value；
Wherein, described electronic expansion valve opening fixed value is 80 steps.
12. electric expansion valve detecting systems according to claim 10 are it is characterised in that described detecting tool also includes
Two input modules；
Described second input module, for inputting electronic expansion valve opening empirical value to the control chip of described electrical equipment；
The control chip of described electrical equipment, according to described electronic expansion valve opening empirical value, controls described electric expansion valve to close
To described second opening value；
Wherein, described electronic expansion valve opening empirical value is more than or equal to the 70% of described first opening value, and less than or equal to described the
The 90% of one opening value.
13. electric expansion valve detecting systems according to any one of claim 7 to 12 are it is characterised in that described detection mould
Block is pressure transducer；Described pressure transducer is arranged on the pipe laying of described electric expansion valve.
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| CN104482638A (en) * | 2014-12-09 | 2015-04-01 | 广东美的制冷设备有限公司 | Air conditioner and fault detection method for electronic expansion valve of air conditioner |
| CN106500238B (en) * | 2016-09-12 | 2019-06-14 | 珠海格力电器股份有限公司 | Electric expansion valve fault detection method, device and multi-connected machine device systems |
| CN106404371B (en) * | 2016-10-10 | 2019-03-08 | 广东美的暖通设备有限公司 | Electric expansion valve detection method and device, air-conditioning system |
| CN107219412A (en) * | 2017-07-28 | 2017-09-29 | 广东美的暖通设备有限公司 | Coil line sequence detection method, device and system and the air-conditioning system of electric expansion valve |
| DE102017214941A1 (en) | 2017-08-25 | 2019-02-28 | Dometic Sweden Ab | Recreational vehicle, cooling device, control system and method of controlling the cooling device |
| DE112018005002T5 (en) | 2017-10-27 | 2020-07-16 | Dometic Sweden Ab | SYSTEMS, METHODS AND DEVICES FOR PROVIDING COMMUNICATION BETWEEN AIR-CONDITIONING CONTROL DEVICES IN A MOTORHOME |
| CN108613335B (en) * | 2018-03-12 | 2019-12-27 | 珠海格力电器股份有限公司 | Fault detection method and device of air conditioner, storage medium and processor |
| CN109813020B (en) * | 2019-02-20 | 2020-03-06 | 珠海格力电器股份有限公司 | Electronic expansion valve blockage detection method, heat pump system control method, electric appliance and computer readable storage medium |
| CN110500710B (en) * | 2019-07-30 | 2021-07-20 | 广东申菱环境系统股份有限公司 | Air conditioner fault self-diagnosis method |
| CN111122148B (en) * | 2019-12-17 | 2021-11-26 | 重庆南方数控设备股份有限公司 | Method for detecting blood by prejudging working state of electromagnetic valve based on hemorheometer |
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