CN116399056A - Over-temperature diagnosis strategy, medium and equipment for electric heat pump compressor controller - Google Patents
Over-temperature diagnosis strategy, medium and equipment for electric heat pump compressor controller Download PDFInfo
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- CN116399056A CN116399056A CN202310518974.8A CN202310518974A CN116399056A CN 116399056 A CN116399056 A CN 116399056A CN 202310518974 A CN202310518974 A CN 202310518974A CN 116399056 A CN116399056 A CN 116399056A
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- temperature
- temp2
- power module
- heat pump
- temp3
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- 238000003745 diagnosis Methods 0.000 title abstract description 8
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 238000004590 computer program Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims 1
- 238000004378 air conditioning Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an over-temperature diagnosis strategy, medium and equipment for an electric heat pump compressor controller, wherein the diagnosis strategy comprises the following steps: the temperature sampling unit is controlled to collect the initial temperature temp0 when the compressor is just started; based on the initial temperature temp0 and a preset threshold value of temperature, setting a temperature protection threshold: if temp0 is less than a preset threshold value, setting the temperature protection threshold as temp3, otherwise setting the temperature protection threshold as temp2, wherein temp2 is more than temp3; controlling a temperature sampling unit to collect the running temperature temp of the power module in real time; based on the power module operating temperature temp and the temperature protection threshold, performing a protection action: if temp is greater than or equal to the temperature protection threshold, stopping the power module for protection, otherwise, controlling the normal operation of the compressor.
Description
Technical Field
The invention relates to an over-temperature diagnosis strategy, medium and equipment for an electric heat pump compressor controller, and belongs to the technical field of compressors.
Background
With the development of the automobile industry, new energy automobiles have taken up a certain market share; the heat pump compressor is used as a main component of an air conditioning system, and is widely applied to the fields of refrigeration in summer, whole vehicle charging and cooling and the like. The power module is used as a main component of the controller, so that whether the compressor and the air conditioning system can work normally or not is influenced; the power module is damaged, the air conditioner does not refrigerate in summer when the power module is light, and the safety accident occurs when the power module is heavy.
Data statistics current power module damage is mainly due to temperature. Most of the existing over-temperature diagnosis methods set a fixed value as a protection threshold, and the over-protection occurs when the compressor is in an abnormal working condition such as high temperature (120 ℃), although the compressor can be normally protected under most conditions; when the compressor is in low-speed high current, the refrigerating capacity is insufficient at the moment, and the temperature continuously rises, so that the constant value protection temperature is too high, the protection is not timely, the controller is damaged due to overtemperature, and the like.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide an over-temperature diagnosis strategy, medium and equipment for an electric heat pump compressor controller, and solve the problems that in the prior art, a power module starts over-temperature protection or devices are damaged before the over-temperature protection starts, and the stability and reliability of a system are affected.
In order to achieve the above object, the present invention adopts the following technical scheme:
an electric heat pump compressor controller over-temperature diagnostic strategy comprising the steps of:
the temperature sampling unit is controlled to collect the initial temperature temp0 of the compressor when the compressor just runs;
based on the initial temperature temp0 and a preset threshold value of temperature, setting a temperature protection threshold: if temp0 is less than a preset threshold value, setting the temperature protection threshold as temp3, otherwise setting the temperature protection threshold as temp2, wherein temp2 is more than temp3;
controlling a temperature sampling unit to collect the running temperature temp of the power module in real time;
based on the power module operating temperature temp and the temperature protection threshold, performing a protection action: if temp is greater than or equal to the temperature protection threshold, stopping the power module for protection, otherwise, controlling the normal operation of the compressor.
Further, temp3 is a temperature value corresponding to a power module temperature-phase current relationship diagram based on the operating phase current I.
Further, the aforesaid temp 2=temp 0+offset, the offset is the difference between the maximum allowable operating temperature designed by the controller and the ambient temperature at the time of starting, and the specific value of the offset is obtained by the calibration experiment of the ambient temperature in which the compressor operates.
Further, tj > temp2 > temp3, tj is the junction temperature of the power module.
Further, when the temperature protection threshold is set to temp2, the step of executing the protection action based on the power module operating temperature temp and the temperature protection threshold includes:
enabling a timer to time the running time T of the compressor and setting a judging time T1;
when T is more than or equal to T1 and temp is more than or equal to temp2, stopping the power module to protect the power module;
when T is more than or equal to T1 and temp is less than temp2, setting the temperature protection threshold from temp2 to temp3.
Further, the mode that the temperature protection threshold is set to temp3 by temp2 is as follows: the temp3 is smoothly transitioned from temp2 in a fixed step size.
A computer readable storage medium storing a computer program which, when read and run by a processor, implements the electric heat pump compressor controller over-temperature diagnostic strategy of any one of claims 1-5.
A computer device comprising a computer readable storage medium storing a computer program and a processor, the computer program implementing an electric heat pump compressor controller over-temperature diagnostic strategy according to any one of claims 1-5 when read and run by the processor.
The invention has the beneficial effects that:
1. and deducing the environmental temperature according to the instantaneous temperature of the initial operation of the enabling compressor, and avoiding frequent protection caused by over protection in a high-temperature environment to influence driving experience.
2. According to the phase current, different temperature protection thresholds are set to prevent the excessive current, the temperature protection is not in time, and the controller is damaged, so that the compressor cannot operate.
Drawings
FIG. 1 is a flow chart of a diagnostic strategy of the present invention;
fig. 2 is a graph of the temperature-phase current relationship of a power module according to the present invention.
Description of the embodiments
The following detailed description of the technical solutions of the present invention is made by the accompanying drawings and specific embodiments, and it should be understood that the specific features of the embodiments and embodiments of the present application are detailed descriptions of the technical solutions of the present application, and not limiting the technical solutions of the present application, and the technical features of the embodiments and embodiments of the present application may be combined with each other without conflict.
Example 1
The embodiment discloses an over-temperature diagnosis strategy applied to an electric heat pump compressor controller, as shown in fig. 1.
The compressor receives the enabling, and the temperature sampling unit collects initial temperature temp0 when the compressor just runs, and the initial temperature temp0 is approximate to the environment temperature of the power module.
Comparing the initial temperature temp0 with a preset threshold value, and determining the preset threshold value by comprehensively considering the operating temperature requirement of the controller and the current flowing through the power device at the moment of starting:
if temp0 is less than the preset threshold value, setting the temperature protection threshold as temp3, wherein temp3 is based on the operating phase current I, according to the power module temperature-phase current relation diagram, looking up the obtained temperature value, and the operating phase current I is collected by the current sampling unit. In the operation process of the compressor, the temperature sampling unit acquires the operation temperature temp of the power module in real time, if temp is more than or equal to temp3, the power module is protected by controlling the shutdown, otherwise, the normal operation of the compressor is controlled;
if temp0 is greater than or equal to a preset threshold value, setting a temperature protection threshold as temp2, where temp 2=temp 0+offset refers to a difference between a maximum allowable running temperature designed by the controller and an ambient temperature at the time of starting, and a specific value of offset is obtained by an ambient temperature calibration experiment of the compressor running. Tj > temp2 > temp3, tj being the junction temperature of the power module. The refrigerating capacity is not immediately applied to the power module when the compressor just runs, and the temperature of the power module at the stage is increased, so that the timer is enabled to time the running time T of the compressor and set the judging time T1, when T is more than or equal to T1, the temperature sampling unit acquires the running temperature temp of the power module at the moment in real time, and if temp is more than or equal to temp2, the power module is stopped for protection; if temp < temp2, the temperature protection threshold is not triggered, the temperature protection threshold is smoothly transited from temp2 to temp3 in a fixed step length.
Example two
The present embodiment proposes a computer device comprising a computer readable storage medium storing a computer program and a processor, which when read and run by the processor implements an electric heat pump compressor controller over-temperature diagnostic strategy as described above.
Example III
The present embodiment proposes a computer readable storage medium storing a computer program which, when read and run by a processor, implements an electric heat pump compressor controller over-temperature diagnostic strategy as described above.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (8)
1. An electric heat pump compressor controller over-temperature diagnostic strategy, comprising the steps of:
the temperature sampling unit is controlled to collect the initial temperature temp0 of the compressor when the compressor just runs;
based on the initial temperature temp0 and a preset threshold value of temperature, setting a temperature protection threshold: if temp0 is less than a preset threshold value, setting the temperature protection threshold as temp3, otherwise setting the temperature protection threshold as temp2, wherein temp2 is more than temp3;
controlling a temperature sampling unit to collect the running temperature temp of the power module in real time;
based on the power module operating temperature temp and the temperature protection threshold, performing a protection action: if temp is greater than or equal to the temperature protection threshold, stopping the power module for protection, otherwise, controlling the normal operation of the compressor.
2. The motor-driven heat pump compressor controller over-temperature diagnostic strategy according to claim 1, wherein temp3 is a temperature value corresponding to a power module temperature-phase current relationship diagram based on an operating phase current I.
3. An electric heat pump compressor controller over temperature diagnostic strategy according to claim 1, wherein temp2 = temp0+ offset, the offset being the difference between the maximum allowable operating temperature of the controller design and the ambient temperature at start-up, the specific value of the offset being derived from an ambient temperature calibration experiment of compressor operation.
4. The electric heat pump compressor controller over-temperature diagnostic strategy of claim 1, wherein Tj > temp2 > temp3, and Tj is a power module junction temperature.
5. The motor-driven heat pump compressor controller over-temperature diagnostic strategy according to claim 1, wherein when the temperature protection threshold is set to temp2, the step of performing the protection action based on the power module operating temperature temp and the temperature protection threshold comprises:
enabling a timer to time the running time T of the compressor and setting a judging time T1;
when T is more than or equal to T1 and temp is more than or equal to temp2, stopping the power module to protect the power module;
when T is more than or equal to T1 and temp is less than temp2, setting the temperature protection threshold from temp2 to temp3.
6. The motor-driven heat pump compressor controller over-temperature diagnostic strategy according to claim 5, wherein the temperature protection threshold is set to temp3 by temp2 in the following manner: the transition from temp2 to temp3 is smooth with a fixed step size.
7. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when read and run by a processor, implements the electric heat pump compressor controller over temperature diagnostic strategy according to any one of claims 1-6.
8. A computer device comprising a computer readable storage medium storing a computer program and a processor, the computer program implementing an electric heat pump compressor controller over-temperature diagnostic strategy according to any one of claims 1-6 when read and run by the processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310518974.8A CN116399056A (en) | 2023-05-10 | 2023-05-10 | Over-temperature diagnosis strategy, medium and equipment for electric heat pump compressor controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310518974.8A CN116399056A (en) | 2023-05-10 | 2023-05-10 | Over-temperature diagnosis strategy, medium and equipment for electric heat pump compressor controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116399056A true CN116399056A (en) | 2023-07-07 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310518974.8A Pending CN116399056A (en) | 2023-05-10 | 2023-05-10 | Over-temperature diagnosis strategy, medium and equipment for electric heat pump compressor controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116399056A (en) |
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2023
- 2023-05-10 CN CN202310518974.8A patent/CN116399056A/en active Pending
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