CN114013244A - Control method and device for electronic expansion valve of automobile heat pump system - Google Patents

Control method and device for electronic expansion valve of automobile heat pump system Download PDF

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Publication number
CN114013244A
CN114013244A CN202210004575.5A CN202210004575A CN114013244A CN 114013244 A CN114013244 A CN 114013244A CN 202210004575 A CN202210004575 A CN 202210004575A CN 114013244 A CN114013244 A CN 114013244A
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target
heat pump
pump system
value
current
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CN114013244B (en
Inventor
姜钊
朱想先
李明
多米尼克·哈伯
林鑫
本杰明·齐茨曼
斯蒂芬·韦纳
约翰内斯·威尔
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Ningbo Preh Joyson Automotive Electronics Co ltd
Preh GmbH
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Ningbo Preh Joyson Automotive Electronics Co ltd
Preh GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
    • B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
    • B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
    • B60H1/00899—Controlling the flow of liquid in a heat pump system
    • 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
    • F25B30/00—Heat pumps
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The embodiment of the invention discloses a control method and a device of an electronic expansion valve of an automobile heat pump system, wherein the method comprises the following steps: acquiring a preset target valve opening range corresponding to a target electronic expansion valve through the current target working parameter condition and working state of a target heat pump system; judging whether the current target heat pump system enters a stable working state or not; if so, acquiring a target theoretical optimal high pressure value corresponding to the heat pump system, and adjusting the current target valve output value; judging whether the difference value between the target theoretical optimal high-pressure value and the current actual high-pressure value of the target heat pump system is smaller than or equal to a target preset difference value threshold value or not; if so, adjusting the current target valve output value according to the change trend of the target energy consumption conversion efficiency in the preset time period.

Description

Control method and device for electronic expansion valve of automobile heat pump system
Technical Field
The invention relates to the technical field of automobile heat pump systems, in particular to a control method and a control device for an electronic expansion valve of an automobile heat pump system.
Background
With the continuous development of electric vehicle technology, the sales volume of electric vehicles is increasing at a rate of more than 30% per year. However, at present, mileage anxiety is still the biggest pain point of an electric vehicle, so that the energy efficiency of the air conditioning system with the second largest power consumption of the whole vehicle must be improved, particularly in the winter heating working condition, and the heat pump system has the excellent low-temperature heating performance, so that the energy consumption of the electric vehicle in winter is greatly improved. Wherein CO is2The heat pump uses a pure natural refrigerant, has high-index environmental protection property, and becomes one of the best choices of future heat management systems.
The electronic expansion valve is one of the important elements of the heat pump system, and the action of the electronic expansion valve during the operation of the heat pump has a direct and important influence on the energy efficiency of the whole system. At present, the electronic expansion valve for the vehicle realizes the accurate adjustment of the valve needle by receiving the number of electronic pulse signals, and the position of the valve needle directly determines the flow area of the valve aperture. The excessive flow area can reduce the heat exchange temperature difference of the system, and the energy waste of excessive refrigerant flow is caused; the flow rate of the system is insufficient due to the excessively small flow area, so that the heat exchange temperature difference of the refrigerant is increased, and the working performance of the system is deteriorated. This requires that the vehicle air conditioning system always have a proper electronic expansion valve opening to achieve the most energy-saving state when operating.
In the prior art, a mainstream electronic expansion valve control method is superheat degree control, and the superheat degree directly reflects the flow of a refrigerant in the method, so that the valve flow is quickly and effectively adjusted, the applicability is wide, but the method cannot be directly related to the energy consumption of an automobile air conditioning system, and the disturbance and variable conditions of the automobile air conditioning system are more, so that the automobile air conditioning system cannot be ensured to accurately work at an optimal energy efficiency point. According to the research of the transcritical thermophysical properties of the refrigerant, a plurality of literature experiments research the reasons influencing the energy efficiency of the heat pump system, including high pressure, low pressure, exhaust temperature, evaporation temperature, superheat degree and the like, and recently, a plurality of patents and discussions about methods for controlling the electronic expansion valve of the heat pump appear, but most of the methods are generated based on the research of a theory and experiment bench system, and the methods are provided aiming at a system with variable conditions, such as an electric automobile heat pump.
Disclosure of Invention
Therefore, in order to solve the above problems, it is necessary to provide a method and a device for controlling an electronic expansion valve of an automotive heat pump system, so as to solve the following problems in the prior art: the mainstream electronic expansion valve control method cannot be directly related to the energy consumption of the automobile air conditioning system, and the disturbance and variable conditions of the automobile air conditioning system are more, so that the automobile air conditioning system cannot be ensured to accurately work at the optimal energy efficiency point.
The first technical scheme of the embodiment of the invention is as follows:
a control method of an electronic expansion valve of an automobile heat pump system comprises the following steps: acquiring a preset target valve opening range corresponding to a target electronic expansion valve through the current target working parameter condition and working state of a target heat pump system; controlling the current target valve output value of the target electronic expansion valve according to the opening range of the target valve, and judging whether the current target heat pump system enters a stable working state; if so, acquiring a target theoretical optimal high-pressure value corresponding to the target heat pump system under the target working parameter condition, and adjusting the current target valve output value according to the target theoretical optimal high-pressure value; judging whether the difference value between the target theoretical optimal high-pressure value and the current actual high-pressure value of the target heat pump system is smaller than or equal to a target preset difference value threshold value or not; and if so, adjusting the current target valve output value according to the change trend of the target energy consumption conversion efficiency in a preset time period.
The second technical scheme of the embodiment of the invention is as follows:
a control device for an electronic expansion valve of an automobile heat pump system comprises: the first acquisition module is used for acquiring a preset target valve opening range corresponding to a target electronic expansion valve through the current target working parameter condition and working state of a target heat pump system; the first judgment module is used for controlling the current target valve output value of the target electronic expansion valve according to the opening range of the target valve and judging whether the current target heat pump system enters a stable working state or not; the second acquisition module is used for acquiring a target theoretical optimal high-pressure value corresponding to the target heat pump system under the target working parameter condition when the current target heat pump system enters a stable working state, and adjusting the current target valve output value according to the target theoretical optimal high-pressure value; the second judgment module is used for judging whether the difference value between the target theoretical optimal high-pressure value and the current actual high-pressure value of the target heat pump system is smaller than or equal to a target preset difference value threshold value or not; and the threshold value adjusting module is used for adjusting the current target valve output value according to the change trend of the target energy consumption conversion efficiency in a preset time period when the difference value between the target theoretical optimal high pressure value and the current actual high pressure value of the target heat pump system is smaller than or equal to the target preset difference value threshold value.
The third technical scheme of the embodiment of the invention is as follows:
a computer device comprising a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps of:
acquiring a preset target valve opening range corresponding to a target electronic expansion valve through the current target working parameter condition and working state of a target heat pump system; controlling the current target valve output value of the target electronic expansion valve according to the opening range of the target valve, and judging whether the current target heat pump system enters a stable working state; if so, acquiring a target theoretical optimal high-pressure value corresponding to the target heat pump system under the target working parameter condition, and adjusting the current target valve output value according to the target theoretical optimal high-pressure value; judging whether the difference value between the target theoretical optimal high-pressure value and the current actual high-pressure value of the target heat pump system is smaller than or equal to a target preset difference value threshold value or not; and if so, adjusting the current target valve output value according to the change trend of the target energy consumption conversion efficiency in a preset time period.
The fourth technical scheme of the embodiment of the invention is as follows:
a computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of:
acquiring a preset target valve opening range corresponding to a target electronic expansion valve through the current target working parameter condition and working state of a target heat pump system; controlling the current target valve output value of the target electronic expansion valve according to the opening range of the target valve, and judging whether the current target heat pump system enters a stable working state; if so, acquiring a target theoretical optimal high-pressure value corresponding to the target heat pump system under the target working parameter condition, and adjusting the current target valve output value according to the target theoretical optimal high-pressure value; judging whether the difference value between the target theoretical optimal high-pressure value and the current actual high-pressure value of the target heat pump system is smaller than or equal to a target preset difference value threshold value or not; and if so, adjusting the current target valve output value according to the change trend of the target energy consumption conversion efficiency in a preset time period.
The embodiment of the invention has the following beneficial effects:
according to the method, firstly, a preset target valve opening range corresponding to a target electronic expansion valve is specified according to target working parameter conditions in a current working state, then a current target valve output value of the target electronic expansion valve is controlled according to the target valve opening range, a target theoretical optimal high-pressure value is obtained after the current target heat pump system is judged to enter a stable working state, the current target valve output value is adjusted according to the target theoretical optimal high-pressure value, and then when a difference value between the target theoretical optimal high-pressure value and a current actual high-pressure value of the target heat pump system is smaller than or equal to a target preset difference value threshold value, the current target valve output value is adjusted according to a change trend of target energy consumption conversion efficiency in a preset time period, so that an automobile air conditioning system can be guaranteed to accurately work at an optimal energy efficiency point.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a flow chart illustrating an embodiment of a method for controlling an electronic expansion valve of a heat pump system of an automobile according to an embodiment of the present invention;
FIG. 2 is a block diagram of an embodiment of a control apparatus for an electronic expansion valve of a heat pump system of an automobile according to an embodiment;
FIG. 3 is a block diagram illustrating an embodiment of a computer device in one embodiment.
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, as can be obtained by referring to fig. 1, a method for controlling an electronic expansion valve of an automotive heat pump system according to an embodiment of the present invention includes the following steps:
step S101: and acquiring a preset target valve opening range corresponding to the target electronic expansion valve according to the current target working parameter condition and working state of the target heat pump system.
The target valve opening range is a preset empirical threshold range, different target working parameter conditions correspond to different target valve opening ranges, the target valve opening range is used for limiting the action range and the basic initial value of the target electronic expansion valve, and according to the actual performance condition of the target electronic expansion valve in the target heat pump system, the target electronic expansion valve has a corresponding reasonable working range under each working condition, and the reasonable working range is a reasonable action area of the target electronic expansion valve. If the reasonable working range is exceeded, the working efficiency of the whole target heat pump system is greatly reduced, so that the working range of the target electronic expansion valve is necessarily limited. Wherein an initial operation value of the valve is given in each of the respective regions, the initial operation value being a middle point value of the working range, i.e. a basic initial value EXV of the respective target electronic expansion valvebase=（EXVmin+EXVmax) (iii) taking the median of the upper and lower limits, where EXVminIs the lower limit value of the opening range of the target valve, is EXVmaxAn upper limit value of the target valve opening range.
The set opening range of the target valve needs to be searched in a target table pre-stored in a designated database according to the target working parameter condition, and if the target working parameter condition does not appear in the range of the target table, a corresponding value is obtained by using a linear interpolation method.
Step S102: and controlling the current target valve output value of the target electronic expansion valve according to the opening range of the target valve, and judging whether the current target heat pump system enters a stable working state.
And controlling the current target valve output value of the target electronic expansion valve according to the target valve opening range, wherein the current target valve output value of the target electronic expansion valve cannot exceed the upper limit and the lower limit of the target valve opening range.
After the target heat pump system is started, if the current target valve output value of the target electronic expansion valve is adjusted along with the parameters due to excessive and too fast changing parameters, the target heat pump system can be slowed down when reaching a stable state. And before the target heat pump system does not reach a steady state, taking the basic initial fixed value as the current target valve output value of the target electronic expansion valve. And after the target heat pump system enters a stable state, correcting the current target valve output value of the electronic expansion valve to ensure that the target heat pump system works in the most energy-saving state.
Step S103: and if the current target heat pump system enters a stable working state, acquiring a target theoretical optimal high-pressure value corresponding to the target heat pump system under the condition of the target working parameters, and adjusting the current target valve output value according to the target theoretical optimal high-pressure value. And the target theoretical optimal high pressure value corresponds to the optimal energy consumption state of the target heat pump system.
Under any working parameter condition, the target heat pump system has a theoretical optimal high-pressure value corresponding to the optimal energy efficiency state of the target heat pump system, so the theoretical optimal high-pressure value needs to be estimated for controlling the target electronic expansion valve. The target theoretical optimal high pressure value is calculated by adopting related parameters, wherein the calculation method comprises the following steps:
Pmax=f（Tevp，Thxout，Tamb) In which P ismaxIs the target theoretical optimum high pressure value, Tevp is the target heat pump system low side evaporating temperature, ThxoutIs the outlet temperature, T, of the heat exchanger at the high pressure side of the target heat pump systemambIs the ambient temperature.
And adjusting the target electronic expansion valve by using the estimated target theoretical optimal high-pressure value to enable the actual pressure of the target heat pump system to be close to the target theoretical optimal high-pressure value. Detailed description of the inventionComprises the following steps: and comparing the difference value between the target theoretical optimal high-pressure value and the current high-pressure value of the target heat pump system, and indicating the degree of the target heat pump system from the optimal energy efficiency state by using the difference value delta P. The larger the differential pressure value Δ P is, the more the adjustment action is made to the target electronic expansion valve, and the valve action value Δ EXV adjusted cumulatively by the integral I control. When the differential pressure value is less than a certain value delta PlimitAfter this, the valve adjusting action Δ EXV will be 0. Therefore, the result of the target electronic expansion valve adjusting according to the target theoretical optimal high pressure value is EXV = EXVbase +∫ΔEXV。
Step S104: and judging whether the difference value between the target theoretical optimal high-pressure value and the current actual high-pressure value of the target heat pump system is smaller than or equal to a target preset difference value threshold value or not.
When the difference value between the target theoretical optimal high-pressure value and the current actual high-pressure value of the target heat pump system is smaller than or equal to the target preset difference threshold value, the target theoretical optimal high-pressure value and the actual optimal high-pressure value of the target heat pump system still have a deviation, so that the target electronic expansion valve can work at the optimal energy-saving position by correcting the deviation in the step.
Step S105: and if the difference value between the target theoretical optimal high-pressure value and the current actual high-pressure value of the target heat pump system is smaller than or equal to a target preset difference value threshold, adjusting the current target valve output value according to the change trend of the target energy consumption conversion efficiency in a preset time period.
Wherein after Δ EXV =0, optionally, self-tuning control method is employed to achieve control of the target electronic expansion valve. The enabling module corresponding to the self-tuning control method is special, whether the enabling module is enabled or not is determined according to the energy consumption conversion efficiency change condition within a period of time, the enabling module is enabled if the maximum value exists in the energy consumption conversion efficiency value within the period of time, and the EXV value is not enabled if the maximum value does not exist, and is changed only when the enabling module is enabled.
If the target energy consumption conversion efficiency of the target heat pump system in a preset time period does not reach a target preset value, the current working state is kept unchanged.
In this embodiment, optionally, after the adjusting the current target valve output value according to the trend of the target energy consumption conversion efficiency within the preset time period, the method includes:
firstly, judging whether the stay time of the target valve output value on a target boundary corresponding to the opening range of the target valve exceeds a target preset time threshold value in the process of adjusting the target valve output value, wherein the target preset time threshold value is an experience threshold value.
Secondly, if the staying time of the target valve output value on a target boundary corresponding to the opening range of the target valve exceeds a target preset time threshold value in the process of adjusting the target valve output value, modifying the target boundary into a target expanded boundary, and judging whether the target energy consumption conversion efficiency corresponding to the target heat pump system is in an increasing trend at the moment.
Thirdly, if the target energy consumption conversion efficiency corresponding to the target heat pump system is in an increasing trend, the target expansion boundary is used as a boundary corresponding to the current target valve opening range.
If the target energy consumption conversion efficiency corresponding to the target heat pump system is in an increasing trend at this time, it is indicated that the target boundary is modified to a target expansion boundary and does not exceed a reasonable working range of the target electronic expansion valve under the current target working parameter condition, and instead, the target energy consumption conversion efficiency corresponding to the target heat pump system continues to increase.
In this embodiment, optionally, the determining whether the current target heat pump system has entered a stable operating state includes:
firstly, judging whether the current low-pressure side actual pressure value corresponding to the target heat pump system is smaller than or equal to a target preset stable pressure value.
Secondly, if the actual pressure value of the low-pressure side corresponding to the current target heat pump system is smaller than or equal to a target preset stable pressure value, it is determined that the current target heat pump system enters a stable working state.
In this step, the condition that the target heat pump system enters the steady state is determined, and it is determined that the low-pressure side pressure of the target heat pump system reaches the target pressure expected value, because the high-pressure side of the target heat pump system operates in the supercritical state, the high-pressure stabilization speed is slow and is easy to fluctuate, and the low-pressure side pressure of the target heat pump system is fast in stabilization speed and strong in disturbance resistance, the low-pressure side pressure of the target heat pump system is used as the steady state determination condition of the target heat pump system.
In this embodiment, optionally, the determining whether the current target heat pump system has entered a stable operating state includes:
firstly, if the current target heat pump system does not enter a stable working state, calculating the average value of an upper limit value and a lower limit value corresponding to the target valve opening range, and recording the average value as a target valve average value. For example, if the lower limit value and the upper limit value corresponding to the target valve opening range are calculated to be 100 and 260, respectively, the target valve average value is (100 + 260)/2 = 180.
Secondly, the target valve average value is used as a current valve output value corresponding to the target electronic expansion valve.
In this embodiment, optionally, the obtaining a target theoretical optimal high pressure value corresponding to the target heat pump system under the condition of the target operating parameter includes:
firstly, acquiring a target low-pressure side evaporation temperature, a target high-pressure side heat exchanger outlet temperature and a target environment temperature corresponding to the target heat pump system under the condition of the target working parameters.
Secondly, calculating the target theoretical optimal high-pressure value according to the target low-pressure side evaporation temperature, the target high-pressure side heat exchanger outlet temperature and the target environment temperature.
In this embodiment, optionally, the adjusting the current target valve output value according to the target theoretical optimal high pressure value includes:
and performing integral control adjustment on the target valve output value through the target theoretical optimal high pressure value and the current actual high pressure value of the target heat pump system by taking the target theoretical optimal high pressure value as a standard until the target theoretical optimal high pressure value and the current actual high pressure value of the target heat pump system are smaller than or equal to a preset difference value.
In this embodiment, optionally, the adjusting the current target valve output value according to a trend of the target energy consumption conversion efficiency within a preset time period includes:
judging whether the target energy consumption conversion efficiency of the target heat pump system in a preset time period has an actual maximum value or not in real time;
if the target energy consumption conversion efficiency of the target heat pump system in the preset time period has an actual maximum value, adjusting the current target valve output value according to the actual maximum value of the target energy consumption conversion efficiency in the preset time period, and determining the current increase and decrease of the target valve output value.
The control method of the present invention is described below with specific examples, and it is assumed that when the target heat pump system is activated, the operating state of the target heat pump system is in the cooling mode due to conditions such as external temperature and light.
The first step is to obtain the preset working range of the target electronic expansion valve:
external temperature (e.g. 35 deg.), illumination (1200 kW/m) according to parameter conditions2) And operating state (cooling mode) to determine the minimum and maximum values of the target electronic expansion valve operating range, such as the minimum value of 100 units and the maximum value of 200 units, wherein the intermediate point of the maximum and minimum values is set to 150 units as the initial operating value of the electronic expansion valve, and wherein the target electronic expansion threshold value EXV = EXVbase ；
The second step is to judge whether the target heat pump system reaches a stable state:
the target heat pump system may require a target temperature after the evaporator in the cooling mode, which may correspond to a pressure, i.e., a target pressure on the low pressure side of the target heat pump system. And (4) because the target pressure at the low-pressure side is stable, when the actual low-pressure of the current target heat pump system is judged to be less than or equal to the target stable pressure, the target heat pump system enters a stable state, and the control of the subsequent steps is continued after the target heat pump system reaches the stable state.
The third step is the optimal high pressure control:
when the target heat pump system is in any working state, a theoretical target theoretical optimal high-pressure value corresponds to the optimal energy efficiency state of the system. It is necessary to control the electronic expansion valve to bring the target heat pump system high side pressure to the optimal high pressure after the system has stabilized. The optimal high pressure can generally be calculated from the actual post-evaporator temperature on the low pressure side, the actual heat exchanger temperature on the high pressure side, and the external ambient temperature.
The difference between the optimum high pressure and the actual high pressure value is used to calculate an integral control IControl for the electronic expansion valve, which is summed over each calculation cycle to a target value for the target electronic expansion valve. As the target electronic expansion valve opening degree changes, the high-side pressure of the target heat pump system also changes. If the difference between said target theoretical optimal high pressure value and said current target valve output value is below a limit value Δ Plimit (i.e. a target preset difference threshold), for example Δ Plimit of 2Bar, then the integral control IControl is set to 0, i.e. not accumulated, and then the target electronic expansion threshold is: EXV = EXVbase +∫ΔEXV。
The fourth step is the optimal maximum search control:
the step refers to optimal energy consumption conversion efficiency control, because a target theoretical optimal high pressure value and an actual optimal high pressure may have a gap, the energy consumption conversion efficiency needs to be compared to correct the gap, and the larger the energy consumption conversion efficiency is, the better the system performance is. This step is allowed to be carried out only after the pressure difference Δ Plimit on the high pressure side is less than 2Bar, and after comparing the trend of the change in the power consumption conversion efficiency over a period of time, self-tuning control is carried out if the power consumption conversion efficiency has a maximum value within 1 minute, and self-tuning control is not carried out if the power consumption conversion efficiency monotonically decreases or increases within 1 minute.
The fifth step is boundary processing of the EXV opening range:
in the first step, the range of the EXV theory in the refrigeration mode is determined, but an actual EXV adjustment process may occur beyond the boundary, and if the time for the EXV to reach the boundary is short, for example, less than 1 minute, the boundary is kept unchanged; if the boundary value is reached in the adjusting process for a long time, automatically adjusting the boundary range, for example, expanding 10 units, comparing whether the energy consumption conversion efficiency is larger than the original energy consumption conversion efficiency when the EXV works in a new boundary range, if the energy consumption conversion efficiency is larger, keeping the boundary adjustment, otherwise, still using the original boundary range, and the step is mainly to check whether the expansion boundary brings beneficial influence on energy saving.
Referring to fig. 2, as can be seen from fig. 2, a control device 100 for an electronic expansion valve of an automotive heat pump system according to an embodiment of the present invention includes:
the first obtaining module 10 is configured to obtain a preset target valve opening range corresponding to a target electronic expansion valve according to a current target operating parameter condition and an operating state of a target heat pump system.
The first judging module 20 is configured to control a current target valve output value of the target electronic expansion valve according to the target valve opening range, and judge whether the current target heat pump system has entered a stable working state.
The second obtaining module 30 is configured to, when the current target heat pump system has entered a stable working state, obtain a target theoretical optimal high pressure value corresponding to the target heat pump system under the target working parameter condition, and adjust the current target valve output value according to the target theoretical optimal high pressure value.
And the second judging module 40 is configured to judge whether a difference between the target theoretical optimal high pressure value and the current actual high pressure value of the target heat pump system is less than or equal to a target preset difference threshold.
And the threshold value adjusting module 50 is configured to adjust the current target valve output value according to a change trend of the target energy consumption conversion efficiency within a preset time period when a difference value between the target theoretical optimal high pressure value and the current actual high pressure value of the target heat pump system is smaller than or equal to the target preset difference threshold value.
FIG. 3 is a diagram illustrating an internal structure of a computer device in one embodiment. The computer device may specifically be a terminal, and may also be a server. As shown in fig. 3, the computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system, and may further store a computer program, and when the computer program is executed by the processor, the computer program may enable the processor to implement the control method for the electronic expansion valve of the automobile heat pump system. The internal memory may also store a computer program, and when the computer program is executed by the processor, the processor may execute the method for controlling the electronic expansion valve of the heat pump system of the vehicle. Those skilled in the art will appreciate that the architecture shown in fig. 3 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In another embodiment, a computer device is presented, comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of:
acquiring a preset target valve opening range corresponding to a target electronic expansion valve through the current target working parameter condition and working state of a target heat pump system; controlling the current target valve output value of the target electronic expansion valve according to the opening range of the target valve, and judging whether the current target heat pump system enters a stable working state; if so, acquiring a target theoretical optimal high-pressure value corresponding to the target heat pump system under the target working parameter condition, and adjusting the current target valve output value according to the target theoretical optimal high-pressure value; judging whether the difference value between the target theoretical optimal high-pressure value and the current actual high-pressure value of the target heat pump system is smaller than or equal to a target preset difference value threshold value or not; and if so, adjusting the current target valve output value according to the change trend of the target energy consumption conversion efficiency in a preset time period.
In another embodiment, a computer-readable storage medium is proposed, in which a computer program is stored which, when executed by a processor, causes the processor to carry out the steps of:
acquiring a preset target valve opening range corresponding to a target electronic expansion valve through the current target working parameter condition and working state of a target heat pump system; controlling the current target valve output value of the target electronic expansion valve according to the opening range of the target valve, and judging whether the current target heat pump system enters a stable working state; if so, acquiring a target theoretical optimal high-pressure value corresponding to the target heat pump system under the target working parameter condition, and adjusting the current target valve output value according to the target theoretical optimal high-pressure value; judging whether the difference value between the target theoretical optimal high-pressure value and the current actual high-pressure value of the target heat pump system is smaller than or equal to a target preset difference value threshold value or not; and if so, adjusting the current target valve output value according to the change trend of the target energy consumption conversion efficiency in a preset time period.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the program is executed. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The invention firstly prescribes a preset target valve opening range corresponding to a target electronic expansion valve according to target working parameter conditions in the current working state, then controls the current target valve output value of the target electronic expansion valve according to the target valve opening range, acquires a target theoretical optimal high pressure value after judging that the current target heat pump system enters a stable working state, adjusts the current target valve output value according to the target theoretical optimal high pressure value, then adjusts the current target valve output value according to the target theoretical optimal high pressure value and the current target valve output value when the difference value between the target theoretical optimal high pressure value and the current target valve output value is less than or equal to a target preset difference threshold value, and adjusts the current target valve output value according to the change trend of target energy consumption conversion efficiency in a preset time period. The automobile air conditioning system can be ensured to accurately work at the optimal energy efficiency point.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A control method for an electronic expansion valve of an automobile heat pump system is characterized by comprising the following steps:
acquiring a preset target valve opening range corresponding to a target electronic expansion valve through the current target working parameter condition and working state of a target heat pump system;
controlling the current target valve output value of the target electronic expansion valve according to the opening range of the target valve, and judging whether the current target heat pump system enters a stable working state;
if so, acquiring a target theoretical optimal high-pressure value corresponding to the target heat pump system under the target working parameter condition, and adjusting the current target valve output value according to the target theoretical optimal high-pressure value;
judging whether the difference value between the target theoretical optimal high-pressure value and the current actual high-pressure value of the target heat pump system is smaller than or equal to a target preset difference value threshold value or not;
and if so, adjusting the current target valve output value according to the change trend of the target energy consumption conversion efficiency in a preset time period.
2. The control method of the electronic expansion valve of the automobile heat pump system according to claim 1, wherein the adjusting the current target valve output value according to the trend of the target energy consumption conversion efficiency within the preset time period comprises:
judging whether the stay time of the target valve output value on a target boundary corresponding to the opening range of the target valve exceeds a target preset time threshold or not in the process of adjusting the target valve output value;
if so, modifying the target boundary into a target expanded boundary, and judging whether the target energy consumption conversion efficiency corresponding to the target heat pump system is in an increasing trend;
and if so, taking the target expansion boundary as a boundary corresponding to the current opening range of the target valve.
3. The control method of the electronic expansion valve of the automotive heat pump system according to claim 1, wherein the determining whether the current target heat pump system has entered a stable operating state includes:
judging whether the current low-pressure side actual pressure value corresponding to the target heat pump system is smaller than or equal to a target preset stable pressure value or not;
if yes, judging that the current target heat pump system enters a stable working state.
4. The control method of the electronic expansion valve of the automotive heat pump system according to claim 1, wherein the determining whether the current target heat pump system has entered a stable operating state, thereafter comprises:
if the current target heat pump system does not enter a stable working state, calculating the average value of an upper limit value and a lower limit value corresponding to the opening range of the target valve, and recording the average value as the average value of the target valve;
and taking the target valve average value as a current valve output value corresponding to the target electronic expansion valve.
5. The control method of the electronic expansion valve of the automobile heat pump system according to claim 1, wherein the obtaining of the target theoretical optimal high pressure value corresponding to the target heat pump system under the target operating parameter condition comprises:
acquiring a target low-pressure side evaporation temperature, a target high-pressure side heat exchanger outlet temperature and a target environment temperature corresponding to the target heat pump system under the target working parameter condition;
and calculating the target theoretical optimal high-pressure value according to the target low-pressure side evaporation temperature, the target high-pressure side heat exchanger outlet temperature and the target environment temperature.
6. The control method of the electronic expansion valve of the automobile heat pump system according to claim 1, wherein the adjusting the current target valve output value according to the target theoretical optimal high pressure value comprises:
and performing integral control adjustment on the target valve output value through the target theoretical optimal high pressure value and the current actual high pressure value of the target heat pump system by taking the target theoretical optimal high pressure value as a standard until the difference value between the target theoretical optimal high pressure value and the current actual high pressure value of the target heat pump system is less than or equal to a preset difference value.
7. The control method of the electronic expansion valve of the automobile heat pump system according to claim 1, wherein the adjusting the current target valve output value according to the trend of the target energy consumption conversion efficiency within the preset time period comprises:
judging whether the target energy consumption conversion efficiency of the target heat pump system in the preset time period has an actual maximum value or not in real time;
if so, adjusting the current target valve output value according to the actual maximum value of the target energy consumption conversion efficiency in the preset time period, and determining the current increase and decrease of the target valve output value.
8. A control device for an electronic expansion valve of an automobile heat pump system is characterized by comprising:
the first acquisition module is used for acquiring a preset target valve opening range corresponding to a target electronic expansion valve through the current target working parameter condition and working state of a target heat pump system;
the first judgment module is used for controlling the current target valve output value of the target electronic expansion valve according to the opening range of the target valve and judging whether the current target heat pump system enters a stable working state or not;
the second acquisition module is used for acquiring a target theoretical optimal high-pressure value corresponding to the target heat pump system under the target working parameter condition when the current target heat pump system enters a stable working state, and adjusting the current target valve output value according to the target theoretical optimal high-pressure value;
the second judgment module is used for judging whether the difference value between the target theoretical optimal high-pressure value and the current actual high-pressure value of the target heat pump system is smaller than or equal to a target preset difference value threshold value or not;
and the threshold value adjusting module is used for adjusting the current target valve output value according to the change trend of the target energy consumption conversion efficiency in a preset time period when the difference value between the target theoretical optimal high pressure value and the current actual high pressure value of the target heat pump system is smaller than or equal to the target preset difference value threshold value.
9. A computer-readable storage medium, characterized in that a computer program is stored, which, when executed by a processor, causes the processor to execute a method for controlling an electronic expansion valve of an automotive heat pump system according to any one of claims 1 to 7.
10. A computer arrangement comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to carry out a method of controlling an electronic expansion valve of an automotive heat pump system as claimed in any one of claims 1 to 7.
CN202210004575.5A 2022-01-05 2022-01-05 Control method and device for electronic expansion valve of automobile heat pump system Active CN114013244B (en)

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101276226A (en) * 2007-03-26 2008-10-01 珠海格力电器股份有限公司 Control method of electronic expansion valve
CN101446463A (en) * 2007-11-27 2009-06-03 珠海格力电器股份有限公司 Control method for electronic expansion valve, self-adaptive control method for heat pump, and device thereof
CN106904058A (en) * 2017-03-10 2017-06-30 安徽江淮汽车集团股份有限公司 Control method for electronic expansion valve and device in heat pump type air conditioning system
US20170358833A1 (en) * 2016-06-14 2017-12-14 Ford Global Technologies, Llc Battery chiller control with electronic expansion device
CN109050200A (en) * 2018-08-22 2018-12-21 吉林大学 A kind of control method of automobile heat pump air conditioner
CN109373527A (en) * 2018-09-12 2019-02-22 珠海格力电器股份有限公司 A kind of regulation method, device and equipment of electric expansion valve
US20190255915A1 (en) * 2016-07-04 2019-08-22 Qingdao Haier Air Conditioner General Corp., Ltd. Method of adjusting electronic expansion valve of air conditioner
CN110953766A (en) * 2019-12-06 2020-04-03 格力电器（杭州）有限公司 Heat pump and optimal superheat degree control device and control method thereof
CN111076367A (en) * 2019-12-05 2020-04-28 珠海格力电器股份有限公司 Electronic expansion valve opening control method, computer readable storage medium and air conditioner
CN111442570A (en) * 2020-03-13 2020-07-24 青岛经济技术开发区海尔热水器有限公司 Control method, device, equipment and storage medium of space energy system
CN111692736A (en) * 2020-06-04 2020-09-22 广东美的制冷设备有限公司 Control method of electronic expansion valve and air conditioning system
CN113446758A (en) * 2020-03-26 2021-09-28 广州汽车集团股份有限公司 Control method and device of electronic expansion valve and heat pump system

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101276226A (en) * 2007-03-26 2008-10-01 珠海格力电器股份有限公司 Control method of electronic expansion valve
CN101446463A (en) * 2007-11-27 2009-06-03 珠海格力电器股份有限公司 Control method for electronic expansion valve, self-adaptive control method for heat pump, and device thereof
US20170358833A1 (en) * 2016-06-14 2017-12-14 Ford Global Technologies, Llc Battery chiller control with electronic expansion device
US20190255915A1 (en) * 2016-07-04 2019-08-22 Qingdao Haier Air Conditioner General Corp., Ltd. Method of adjusting electronic expansion valve of air conditioner
CN106904058A (en) * 2017-03-10 2017-06-30 安徽江淮汽车集团股份有限公司 Control method for electronic expansion valve and device in heat pump type air conditioning system
CN109050200A (en) * 2018-08-22 2018-12-21 吉林大学 A kind of control method of automobile heat pump air conditioner
CN109373527A (en) * 2018-09-12 2019-02-22 珠海格力电器股份有限公司 A kind of regulation method, device and equipment of electric expansion valve
CN111076367A (en) * 2019-12-05 2020-04-28 珠海格力电器股份有限公司 Electronic expansion valve opening control method, computer readable storage medium and air conditioner
CN110953766A (en) * 2019-12-06 2020-04-03 格力电器（杭州）有限公司 Heat pump and optimal superheat degree control device and control method thereof
CN111442570A (en) * 2020-03-13 2020-07-24 青岛经济技术开发区海尔热水器有限公司 Control method, device, equipment and storage medium of space energy system
CN113446758A (en) * 2020-03-26 2021-09-28 广州汽车集团股份有限公司 Control method and device of electronic expansion valve and heat pump system
CN111692736A (en) * 2020-06-04 2020-09-22 广东美的制冷设备有限公司 Control method of electronic expansion valve and air conditioning system

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