CN116587806A - Evaporator frosting early warning method, device and system and storage medium - Google Patents
Evaporator frosting early warning method, device and system and storage medium Download PDFInfo
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- CN116587806A CN116587806A CN202310723111.4A CN202310723111A CN116587806A CN 116587806 A CN116587806 A CN 116587806A CN 202310723111 A CN202310723111 A CN 202310723111A CN 116587806 A CN116587806 A CN 116587806A
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- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000010257 thawing Methods 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 description 13
- 238000004891 communication Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 238000004590 computer program Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000004378 air conditioning Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 4
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- 230000001133 acceleration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
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- 239000003507 refrigerant Substances 0.000 description 1
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Classifications
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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
- B60H1/00978—Control systems or circuits characterised by failure of detection or safety means; Diagnostic methods
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses
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- Air-Conditioning For Vehicles (AREA)
Abstract
The application discloses an evaporator frosting early warning method, device, system and storage medium, wherein the method comprises the following steps: when a vehicle heat pump system operates, acquiring preset parameters of the vehicle, wherein the preset parameters at least comprise low pressure of the heat pump system; when the low pressure of the heat pump system is lower than a preset pressure, determining the actual heat exchange amount and the theoretical heat exchange limit of the evaporator; and when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than a first preset value, giving out an evaporator frosting early warning. The scheme provided by the application is adopted: on the basis of judging through the low pressure of the heat pump system, the frosting risk of the evaporator is further increased, and the frosting early warning accuracy of the evaporator is improved.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to an evaporator frosting early warning method, an evaporator frosting early warning device, an evaporator frosting early warning system and a storage medium.
Background
The automobile heat exchanger is used for helping the engine to dissipate heat and keeping the equipment at the running temperature; the automobile evaporator is one of the components of an automobile air conditioning system, and is characterized in that the refrigerant in the air conditioning system is changed from a liquid state to a gas state, and the evaporator can absorb heat of air nearby the evaporator. When heating in winter, the heat pump system of the electric automobile can use the heat exchanger as an evaporator so as to reduce the power consumption of the automobile air conditioner in winter. However, when the vehicle is in a high-humidity low-temperature environment, the evaporator is extremely prone to condensation and frosting, so that the heating performance of the air conditioner is attenuated, the operation safety of the compressor and the expansion valve is affected, and the heat dissipation problem of other heat dissipation components (such as a motor battery) is also affected, and the driving safety is further affected.
In the prior art, whether the heat pump of the electric automobile frosts or not is judged through single parameters such as low system pressure. Because the automobile can work under various environmental temperatures and various road conditions, the frosting condition is judged by a single parameter, so that erroneous judgment is easy to cause. Therefore, how to provide an early-warning method for the frosting of the evaporator to improve the accuracy of the early-warning of the frosting becomes a technical problem to be solved urgently.
Disclosure of Invention
The application provides an evaporator frosting early warning method, device and system and a storage medium, which are used for improving the accuracy of frosting early warning.
The application provides a frosting early warning method, which comprises the following steps:
when a vehicle heat pump system operates, acquiring preset parameters of the vehicle, wherein the preset parameters at least comprise low pressure of the heat pump system;
when the low pressure of the heat pump system is lower than a preset pressure, determining the actual heat exchange amount and the theoretical heat exchange limit of the evaporator;
and when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than a first preset value, giving out an evaporator frosting early warning.
The application has the beneficial effects that: when a vehicle heat pump system operates, acquiring preset parameters of the vehicle, wherein the preset parameters at least comprise low pressure of the heat pump system; then, when the low pressure of the heat pump system is lower than the preset pressure, the actual heat exchange amount and the theoretical heat exchange limit of the evaporator are further determined, and whether the frosting early warning value is reached or not is determined according to the ratio of the actual heat exchange amount and the theoretical heat exchange limit of the evaporator; when the ratio is smaller than a first preset value, the heat exchange capacity of the evaporator is obviously reduced, the frosting risk exists, and the frosting early warning is sent out. On the basis of judging through the low pressure of the heat pump system, the frosting risk of the evaporator is further increased, and the frosting early warning accuracy is improved.
In one embodiment, the acquiring the preset parameters of the vehicle includes:
acquiring a working mode of a heat pump system, wherein the working mode comprises a heating mode and a refrigerating mode;
when the working mode is a heating mode, monitoring the continuous starting time of the compressor;
when the continuous start time of the compressor reaches a second preset value, at least one of the following preset parameters of the vehicle is acquired:
the heat pump system is low-pressure, evaporator area, actual rotation speed of the compressor, vehicle speed, front end fan gear and ambient temperature.
In one embodiment, the determining the actual heat exchange amount and the theoretical heat exchange limit of the evaporator includes:
the actual heat exchange amount of the evaporator was calculated by:
inquiring a first corresponding relation table according to the low pressure of the heat pump system to obtain an evaporator inlet enthalpy value, an evaporator outlet enthalpy value and a compressor suction density;
and calculating the actual heat exchange quantity of the evaporator according to the inlet enthalpy value of the evaporator, the outlet enthalpy value of the evaporator and the suction density of the compressor.
In one embodiment, the calculating the actual heat exchange amount of the evaporator according to the evaporator inlet enthalpy value, the evaporator outlet enthalpy value and the compressor suction density comprises:
the actual heat exchange amount of the evaporator is calculated by the following formula:
wherein w is act H is the actual heat exchange amount of the evaporator out For evaporator outlet enthalpy, h in For evaporator inlet enthalpy, r ho Suction density for the compressor.
In one embodiment, the determining the actual heat exchange amount and the theoretical heat exchange limit of the evaporator includes:
the theoretical heat exchange limit of the evaporator is calculated by:
inquiring a second preset table according to the speed and the gear of the fan to obtain the speed of the evaporator, inquiring a third preset table according to the low pressure of the heat pump system to obtain the low pressure saturation temperature, and inquiring a fourth preset table according to the ambient temperature to obtain the air inlet density and the specific heat capacity;
and calculating the theoretical heat exchange limit of the evaporator according to the wind speed, the area of the evaporator, the air inlet density, the specific heat capacity, the low pressure of the system, the ambient temperature and the low pressure saturation temperature of the evaporator.
In one embodiment, the calculating the theoretical heat exchange limit of the evaporator according to the evaporator wind speed, the evaporator area, the inlet air density, the specific heat capacity, the system low pressure, the ambient temperature and the low pressure saturation temperature comprises:
the theoretical heat exchange limit of the evaporator is calculated by the following formula:
w max ＝v×S×r ho ×cP×(T in -T Lp )；
wherein w is max For the theoretical heat exchange limit of the evaporator, v is the speed of the evaporator, S is the area of the evaporator, r hog Is air intake density, cp is specific heat capacity, T in At ambient temperature, T Lp Is a low pressure saturation temperature.
In one embodiment, the method further comprises:
and when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than a first preset value and the maintaining time is longer than a third preset value, sending out defrosting request information or controlling the heat pump system to enter a defrosting mode.
The application also provides an evaporator frosting early warning device, which comprises:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring preset parameters of a vehicle when the vehicle heat pump system is running, and the preset parameters at least comprise low pressure of the heat pump system;
the determining module is used for determining the actual heat exchange amount and the theoretical heat exchange limit of the evaporator when the low pressure of the heat pump system is lower than the preset pressure;
and the early warning module is used for sending out the frost early warning of the evaporator when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than a first preset value.
In one embodiment, the acquisition module includes:
the first acquisition submodule is used for acquiring a working mode of the heat pump system, wherein the working mode comprises a heating mode and a refrigerating mode;
the process submodule is used for monitoring the continuous starting time of the compressor when the working mode is a heating mode;
the second obtaining submodule is used for obtaining at least one of the following preset parameters of the vehicle when the continuous start time of the compressor reaches a second preset value:
the heat pump system is low-pressure, evaporator area, actual rotation speed of the compressor, vehicle speed, front end fan gear and ambient temperature.
In one embodiment, the determining module includes:
the first calculation sub-module is used for calculating the actual heat exchange amount of the evaporator by the following modes:
inquiring a first corresponding relation table according to the low pressure of the heat pump system to obtain an evaporator inlet enthalpy value, an evaporator outlet enthalpy value and a compressor suction density;
and calculating the actual heat exchange quantity of the evaporator according to the inlet enthalpy value of the evaporator, the outlet enthalpy value of the evaporator and the suction density of the compressor.
In one embodiment, the calculating the actual heat exchange amount of the evaporator according to the evaporator inlet enthalpy value, the evaporator outlet enthalpy value and the compressor suction density comprises:
the actual heat exchange amount of the evaporator is calculated by the following formula:
wherein w is act H is the actual heat exchange amount of the evaporator out For evaporator outlet enthalpy, h in For evaporator inlet enthalpy, r ho Suction density for the compressor.
In one embodiment, the determining module includes:
the second calculation sub-module is used for calculating the theoretical heat exchange limit of the evaporator by the following modes:
inquiring a second preset table according to the speed and the gear of the fan to obtain the speed of the evaporator, inquiring a third preset table according to the low pressure of the heat pump system to obtain the low pressure saturation temperature, and inquiring a fourth preset table according to the ambient temperature to obtain the air inlet density and the specific heat capacity;
and calculating the theoretical heat exchange limit of the evaporator according to the wind speed, the area of the evaporator, the air inlet density, the specific heat capacity, the low pressure of the system, the ambient temperature and the low pressure saturation temperature of the evaporator.
In one embodiment, the calculating the theoretical heat exchange limit of the evaporator according to the evaporator wind speed, the evaporator area, the inlet air density, the specific heat capacity, the system low pressure, the ambient temperature and the low pressure saturation temperature comprises:
the theoretical heat exchange limit of the evaporator is calculated by the following formula:
w max ＝v×S×r ho ×cP×(T in -T Lp )；
wherein w is max For the theoretical heat exchange limit of the evaporator, v is the speed of the evaporator, S is the area of the evaporator, r hog Is air intake density, cp is specific heat capacity, T in At ambient temperature, T Lp Is a low pressure saturation temperature.
In one embodiment, the apparatus further comprises:
and the defrosting module is used for sending out defrosting request information or controlling the heat pump system to enter a defrosting mode when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than a first preset value and the maintaining time is larger than a third preset value.
The application also provides an evaporator frosting early warning system, which comprises:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores instructions executable by the at least one processor to implement the evaporator frost warning method described in any of the embodiments above.
The application also provides a computer readable storage medium, when instructions in the storage medium are executed by a processor corresponding to the evaporator frosting early warning system, the evaporator frosting early warning system can realize the evaporator frosting early warning method described in any embodiment.
The application also provides a vehicle, which comprises the evaporator frosting early warning device or the evaporator frosting early warning system.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the application is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, serve to explain the application. In the drawings:
FIG. 1 is a flow chart of a method for early warning of frost formation according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an evaporator frost warning device according to an embodiment of the present application;
fig. 3 is a schematic hardware structure diagram of an evaporator frost warning system according to an embodiment of the application.
Detailed Description
The preferred embodiments of the present application will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present application only, and are not intended to limit the present application.
In order to avoid misjudgment caused by judging whether the heat pump of the electric automobile frosts through only a single parameter such as system low pressure, and more accurately judge the frosting condition of the front-end evaporator in the heat pump mode of the heat pump system of the automobile, the application calculates the actual heat exchange quantity of the evaporator and the theoretical heat exchange limit of the evaporator according to the collected vehicle signals, then determines the actual frosting risk of the evaporator according to the ratio of the actual heat exchange quantity of the evaporator to the theoretical heat exchange limit of the evaporator, and sends out frosting early warning. Fig. 1 is a flowchart of a frost warning method according to an embodiment of the present application, as shown in fig. 1, the method may be implemented as steps S101-S103 as follows:
in step S101, when the vehicle heat pump system is running, acquiring preset parameters of the vehicle, wherein the preset parameters at least comprise low pressure of the heat pump system;
in step S102, when the low pressure of the heat pump system is lower than a preset pressure, determining an actual heat exchange amount and a theoretical heat exchange limit of the evaporator;
in step S103, when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than the first preset value, an evaporator frosting early warning is sent.
When the vehicle heat pump system is running, preset parameters of the vehicle are obtained, wherein the preset parameters at least comprise low pressure of the heat pump system. Since frosting occurs when the high humidity air is cooled below the frost point (the dew point is lower than 0) in the low temperature environment, that is, frosting occurs only when the heat pump system is heated in spring and autumn and winter, in this embodiment, firstly, an operating mode of the heat pump system is obtained, wherein the operating mode includes a heating mode and a cooling mode, when the heat pump system is in the heating mode, it is indicated that frosting may be sent, and vehicle preset parameters need to be obtained to monitor and early warn for frosting risk; of course, whether the frosting risk exists at present or not can be determined in advance through the external temperature and the external humidity, wherein the external temperature and the external humidity can be obtained through a temperature sensor, and temperature and humidity information of the current position of the vehicle can be obtained through a cloud. And then, determining whether other preset information of the vehicle needs to be acquired or not according to the temperature and humidity information. For example, since when the air humidity is <50%, there is little frosting; when the air temperature is higher than 4 ℃, the air temperature is higher, and frosting can not occur; when the air temperature is lower than-4 ℃, the absolute moisture content in the air is smaller, and frosting is reduced; therefore, when the outside temperature is monitored to be between +4 ℃ and-4 ℃ and the air humidity is more than or equal to 50%, the preset parameters of the vehicle are obtained.
Then, when the preset parameters of the vehicle are acquired, the system is in an unstable state just after starting, and the reference value of the acquired preset parameters of the vehicle is not high, so that when the preset parameters of the vehicle are determined to be required to be acquired, the continuous starting time of the compressor is continuously monitored, and when the same ignition period is adopted, and the accumulated time of the starting of the compressor in the heat pump mode is larger than a second preset value, the heat pump mode is determined to operate under a relatively stable working condition. At this time, at least one of the following preset parameters of the vehicle is acquired: the heat pump system is low-pressure, evaporator area, actual rotation speed of the compressor, vehicle speed, front end fan gear and ambient temperature. The actual rotation speed of the compressor, the front end fan gear and the ambient temperature are sent by the whole vehicle control module, the vehicle speed is sent by the vehicle body control module, and the low pressure of the heat pump system is sent by the air conditioner control module, so that the obtained vehicle preset parameters can be obtained without additionally adding a vehicle sensor and the whole vehicle cost of the vehicle is not required to be increased.
And when the low pressure of the heat pump system is lower than the preset pressure, determining the actual heat exchange amount and the theoretical heat exchange limit of the evaporator. Because evaporator frosting can result in a low pressure drop in the system, monitoring the pressure of the heat pump system, for example, when the pressure of the heat pump system is below atmospheric pressure, the system is in a frosting prone state and further determination of frosting risk is required. Therefore, whether the heat exchange capacity of the evaporator is normal or not can be further determined by further determining the actual heat exchange amount and the theoretical heat exchange limit of the evaporator. When the actual heat exchange amount of the evaporator is determined, the corresponding relation between the low pressure of the heat pump system and the inlet enthalpy value of the evaporator, the outlet enthalpy value of the evaporator and the suction density of the compressor is calibrated in advance according to different air conditioning systems, and the corresponding relation is stored in a preset corresponding table. Therefore, the current evaporator inlet enthalpy, evaporator outlet enthalpy and compressor suction density can be determined by looking up a table based on the heat pump system low pressure. And then, calculating the actual heat exchange quantity of the evaporator according to the evaporator inlet enthalpy value, the evaporator outlet enthalpy value and the compressor suction density. Specifically, the actual heat exchange amount of the evaporator is calculated by the following formula:
wherein w is act H is the actual heat exchange amount of the evaporator out For evaporator outlet enthalpy, h in For evaporator inlet enthalpy, r ho Suction density for the compressor.
The theoretical heat exchange limit of the evaporator can be calibrated in advance according to different vehicle types, so that the heat exchange limit of the evaporator under different low pressure and environmental temperature of the heat pump system can be obtained. Of course, the theoretical heat exchange limit of the evaporator can also be calculated according to the preset parameters of the vehicle. Specifically, the corresponding relation among the speed, the fan gear and the evaporator wind, the corresponding relation between the low pressure and the low pressure saturation temperature of the heat pump system, and the corresponding relation between the ambient temperature, the air inlet temperature and the specific heat capacity are calibrated in advance. And then, according to the speed of the current vehicle and the gear of the fan, the speed of the evaporator is obtained by looking up a table, the low-pressure saturation temperature is obtained by looking up a table according to the low-pressure of the heat pump system, and the air inlet density and the specific heat capacity are obtained by looking up a table according to the ambient temperature. And calculating the theoretical heat exchange limit of the evaporator according to the wind speed, the area of the evaporator, the air inlet density, the specific heat capacity, the low pressure of the system, the ambient temperature and the low pressure saturation temperature of the evaporator. Specifically, the theoretical heat exchange limit of the evaporator is calculated by the following formula:
w max ＝v×S×r ho ×cP×(T in -T Lp )；
wherein w is max For the theoretical heat exchange limit of the evaporator, v is the speed of the evaporator, S is the area of the evaporator, r hog Is air intake density, cp is specific heat capacity, T in At ambient temperature, T Lp Is a low pressure saturation temperature.
And when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than a first preset value, giving out an evaporator frosting early warning. And determining the heat exchange capacity of the current evaporator by the ratio of the actual heat exchange amount of the current evaporator to the theoretical heat exchange limit. When the temperature is lower than a first preset value, the heat exchange capacity of the evaporator is reduced, the frosting risk is increased, and then the frosting early warning of the evaporator is sent out. Further, when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than the first preset value and the maintaining time is longer than the third preset value, the fact that the defrosting command is not received is indicated, and at the moment, defrosting request information is sent or the heat pump system is directly controlled to enter a defrosting mode.
The application has the beneficial effects that: when a vehicle heat pump system operates, acquiring preset parameters of the vehicle, wherein the preset parameters at least comprise low pressure of the heat pump system; then, when the low pressure of the heat pump system is lower than the preset pressure, the actual heat exchange amount and the theoretical heat exchange limit of the evaporator are further determined, and whether the frosting early warning value is reached or not is determined according to the ratio of the actual heat exchange amount and the theoretical heat exchange limit of the evaporator; when the ratio is smaller than a first preset value, the heat exchange capacity of the evaporator is obviously reduced, the frosting risk exists, and the frosting early warning is sent out. On the basis of judging through the low pressure of the heat pump system, the frosting risk of the evaporator is further increased, and the frosting early warning accuracy is improved.
In one embodiment, the above step S101 may be performed as steps A1-A3 as follows:
in step A1, acquiring a working mode of a heat pump system, wherein the working mode comprises a heating mode and a refrigerating mode;
in step A2, when the working mode is a heating mode, monitoring the continuous start time of the compressor;
in step A3, when the continuous on time of the compressor reaches a second preset value, at least one of the following preset parameters of the vehicle is obtained:
the heat pump system is low-pressure, evaporator area, actual rotation speed of the compressor, vehicle speed, front end fan gear and ambient temperature.
Since frosting occurs when the high humidity air is cooled below the frost point (meaning the dew point is lower than 0) in the low temperature environment, that is, frosting occurs only when the heat pump system is heated in spring and autumn and winter, in this embodiment, first, an operation mode of the heat pump system is obtained, wherein the operation mode includes a heating mode and a cooling mode; then, because the system is in an unstable state when just starting, the reference value of the preset parameters of the vehicle obtained at the moment is not high, when the working mode is a heating mode, the continuous starting time of the compressor is continuously monitored, and when the accumulated starting time of the compressor is larger than a second preset value in the same ignition period and the heat pump mode, the heat pump mode is determined to run into a relatively stable working condition. At this time, at least one of the following preset parameters of the vehicle is acquired: the heat pump system is low-pressure, evaporator area, actual rotation speed of the compressor, vehicle speed, front end fan gear and ambient temperature. The actual rotation speed of the compressor, the front end fan gear and the ambient temperature are sent by the whole vehicle control module, the vehicle speed is sent by the vehicle body control module, and the low pressure of the heat pump system is sent by the air conditioner control module, so that parameters acquired in the embodiment can be acquired without additionally increasing a vehicle sensor and the whole vehicle cost of a vehicle.
In one embodiment, the step 102 may calculate the actual heat exchange amount of the evaporator by the following steps B1-B2:
in the step B1, inquiring a first corresponding relation table according to the low pressure of the heat pump system to obtain an evaporator inlet enthalpy value, an evaporator outlet enthalpy value and a compressor suction density;
in step B2, the actual heat exchange amount of the evaporator is calculated according to the evaporator inlet enthalpy value, the evaporator outlet enthalpy value and the compressor suction density.
According to different air conditioning systems, the corresponding relation between the low pressure of the heat pump system and the enthalpy value of the inlet of the evaporator, the enthalpy value of the outlet of the evaporator and the suction density of the compressor is calibrated in advance, and a preset corresponding table is stored. Therefore, the current evaporator inlet enthalpy, evaporator outlet enthalpy and compressor suction density can be determined by looking up a table based on the heat pump system low pressure.
And then, calculating the actual heat exchange quantity of the evaporator according to the evaporator inlet enthalpy value, the evaporator outlet enthalpy value and the compressor suction density. Specifically, the actual heat exchange amount of the evaporator is calculated by the following formula:
wherein w is act H is the actual heat exchange amount of the evaporator out For evaporator outlet enthalpy, h in For evaporator inlet enthalpy, r ho Suction density for the compressor.
In one embodiment, step 102 described above may calculate the theoretical heat exchange limit of the evaporator by steps C1-C2 as follows:
in the step C1, inquiring a second preset table according to the speed and the gear of the fan to obtain the speed of the evaporator, inquiring a third preset table according to the low pressure of the heat pump system to obtain the low pressure saturation temperature, and inquiring a fourth preset table according to the ambient temperature to obtain the air inlet density and the specific heat capacity;
in step C2, calculating the theoretical heat exchange limit of the evaporator according to the air speed, the area of the evaporator, the air inlet density, the specific heat capacity, the low pressure of the system, the ambient temperature and the low pressure saturation temperature of the evaporator.
In this embodiment, the corresponding relationship between the vehicle speed, the fan gear and the evaporator wind, and the corresponding relationship between the low pressure and the low pressure saturation temperature of the heat pump system, and the corresponding relationship between the ambient temperature and the intake air temperature and the specific heat capacity are calibrated in advance. Therefore, the second preset table is inquired according to the speed and the gear of the fan to obtain the speed of the evaporator, the third preset table is inquired according to the low pressure of the heat pump system to obtain the low pressure saturation temperature, and the fourth preset table is inquired according to the ambient temperature to obtain the air inlet density and the specific heat capacity.
And then, calculating the theoretical heat exchange limit of the evaporator according to the air speed, the area of the evaporator, the air inlet density, the specific heat capacity, the low pressure of the system, the ambient temperature and the low pressure saturation temperature of the evaporator. Specifically, the theoretical heat exchange limit of the evaporator is calculated by the following formula:
w max ＝v×S×r ho ×cP×(T in -T Lp )；
wherein w is max For the theoretical heat exchange limit of the evaporator, v is the speed of the evaporator, S is the area of the evaporator, r hog Is air intake density, cp is specific heat capacity, T in At ambient temperature, T Lp Is a low pressure saturation temperature.
In one embodiment, the method may also be implemented as the following step D1:
in step D1, when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than the first preset value and the maintaining time is longer than the third preset value, a defrosting request message is sent or the heat pump system is controlled to enter a defrosting mode.
Fig. 2 is a schematic structural diagram of an evaporator frost warning device according to an embodiment of the present application, as shown in fig. 2, the device includes:
an obtaining module 201, configured to obtain preset parameters of a vehicle when a heat pump system of the vehicle is running, where the preset parameters at least include a low pressure of the heat pump system;
a determining module 202, configured to determine an actual heat exchange amount and a theoretical heat exchange limit of the evaporator when the low pressure of the heat pump system is lower than a preset pressure;
and the early warning module 203 is configured to send out an early warning of frosting of the evaporator when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than a first preset value.
In one embodiment, the acquisition module includes:
the first acquisition submodule is used for acquiring a working mode of the heat pump system, wherein the working mode comprises a heating mode and a refrigerating mode;
the process submodule is used for monitoring the continuous starting time of the compressor when the working mode is a heating mode;
the second obtaining submodule is used for obtaining at least one of the following preset parameters of the vehicle when the continuous start time of the compressor reaches a second preset value:
the heat pump system is low-pressure, evaporator area, actual rotation speed of the compressor, vehicle speed, front end fan gear and ambient temperature.
In one embodiment, the determining module includes:
the first calculation sub-module is used for calculating the actual heat exchange amount of the evaporator by the following modes:
inquiring a first corresponding relation table according to the low pressure of the heat pump system to obtain an evaporator inlet enthalpy value, an evaporator outlet enthalpy value and a compressor suction density;
and calculating the actual heat exchange quantity of the evaporator according to the inlet enthalpy value of the evaporator, the outlet enthalpy value of the evaporator and the suction density of the compressor.
In one embodiment, the calculating the actual heat exchange amount of the evaporator according to the evaporator inlet enthalpy value, the evaporator outlet enthalpy value and the compressor suction density comprises:
the actual heat exchange amount of the evaporator is calculated by the following formula:
wherein w is act H is the actual heat exchange amount of the evaporator out For evaporator outlet enthalpy, h in For evaporator inlet enthalpy, r ho Suction density for the compressor.
In one embodiment, the determining module includes:
the second calculation sub-module is used for calculating the theoretical heat exchange limit of the evaporator by the following modes:
inquiring a second preset table according to the speed and the gear of the fan to obtain the speed of the evaporator, inquiring a third preset table according to the low pressure of the heat pump system to obtain the low pressure saturation temperature, and inquiring a fourth preset table according to the ambient temperature to obtain the air inlet density and the specific heat capacity;
and calculating the theoretical heat exchange limit of the evaporator according to the wind speed, the area of the evaporator, the air inlet density, the specific heat capacity, the low pressure of the system, the ambient temperature and the low pressure saturation temperature of the evaporator.
In one embodiment, the calculating the theoretical heat exchange limit of the evaporator according to the evaporator wind speed, the evaporator area, the inlet air density, the specific heat capacity, the system low pressure, the ambient temperature and the low pressure saturation temperature comprises:
the theoretical heat exchange limit of the evaporator is calculated by the following formula:
w max ＝v×S×r ho ×cP×(T in -T Lp )；
wherein w is max For the theoretical heat exchange limit of the evaporator, v is the speed of the evaporator, S is the area of the evaporator, r ho For compressor suction density, c is specific heat capacity, P is system low pressure, T in Is of air intake density T Lp Is a low pressure saturation temperature.
In one embodiment, the apparatus further comprises:
and the defrosting module is used for sending out defrosting request information or controlling the heat pump system to enter a defrosting mode when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than a first preset value and the maintaining time is larger than a third preset value.
Fig. 3 is a schematic hardware structure of an evaporator frost warning system according to an embodiment of the present application, as shown in fig. 3, the system includes:
at least one processor 320; the method comprises the steps of,
a memory 304 communicatively coupled to the at least one processor; wherein,,
the memory 304 stores instructions executable by the at least one processor 320 to implement the evaporator frost warning method described in any of the above embodiments.
Referring to fig. 3, the evaporator frost warning system 300 may include one or more of the following components: a processing component 302, a memory 304, a power supply component 306, a multimedia component 308, an audio component 310, an input/output (I/O) interface 312, a sensor component 314, and a communication component 316.
The processing assembly 302 generally controls the overall operation of the evaporator frost warning system 300. The processing component 302 may include one or more processors 320 to execute instructions to perform all or part of the steps of the methods described above. Further, the processing component 302 can include one or more modules that facilitate interactions between the processing component 302 and other components. For example, the processing component 302 may include a multimedia module to facilitate interaction between the multimedia component 308 and the processing component 302.
The memory 304 is configured to store various types of data to support operation of the evaporator frosting early warning system 300. Examples of such data include instructions, such as text, pictures, video, etc., for any application or method operating on the evaporator frost warning system 300. The memory 304 may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
The power component 306 provides power to the various components of the evaporator frost warning system 300. The power components 306 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the evaporator frost warning system 300.
The multimedia component 308 includes a screen that provides an output interface between the evaporator frosting warning system 300 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may sense not only the boundary of a touch or sliding action, but also the duration and pressure associated with the touch or sliding operation. In some embodiments, the multimedia component 308 can also include a front-facing camera and/or a rear-facing camera. When the evaporator frosting pre-warning system 300 is in an operational mode, such as a shooting mode or a video mode, the front camera and/or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.
The audio component 310 is configured to output and/or input audio signals. For example, the audio component 310 includes a Microphone (MIC) configured to receive external audio signals when the evaporator frosting pre-warning system 300 is in an operational mode, such as an alarm mode, a recording mode, a voice recognition mode, and a voice output mode. The received audio signals may be further stored in the memory 304 or transmitted via the communication component 316. In some embodiments, audio component 310 further comprises a speaker for outputting audio signals.
The I/O interface 312 provides an interface between the processing component 302 and peripheral interface modules, which may be a keyboard, click wheel, buttons, etc. These buttons may include, but are not limited to: homepage button, volume button, start button, and lock button.
The sensor assembly 314 includes one or more sensors for providing status assessment of various aspects of the evaporator frost warning system 300. For example, the sensor assembly 314 may include a sound sensor. In addition, the sensor assembly 314 may detect the on/off status of the evaporator frosting pre-warning system 300, the relative positioning of the components, such as the display and keypad of the evaporator frosting pre-warning system 300, the sensor assembly 314 may also detect the operational status of the evaporator frosting pre-warning system 300 or components of the evaporator frosting pre-warning system 300, the orientation or acceleration/deceleration of the evaporator frosting pre-warning system 300, and the temperature change of the evaporator frosting pre-warning system 300. The sensor assembly 314 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. The sensor assembly 314 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 314 may also include acceleration sensors, gyroscopic sensors, magnetic sensors, pressure sensors, temperature sensors.
The communication component 316 is configured to enable the evaporator frosting pre-warning system 300 to provide wired or wireless communication capabilities with other devices and cloud platforms. The evaporator frosting warning system 300 can access a wireless network based on a communication standard, such as WiFi,2G or 3G, or a combination thereof. In one exemplary embodiment, the communication component 316 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, the communication component 316 further includes a Near Field Communication (NFC) module to facilitate short range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the evaporator frost warning system 300 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for performing the evaporator frost warning method described in any of the above embodiments.
The application also provides a computer readable storage medium, when instructions in the storage medium are executed by a processor corresponding to the evaporator frosting early warning system, the evaporator frosting early warning system can realize the evaporator frosting early warning method described in any embodiment.
The application also provides a vehicle, which comprises the evaporator frosting early warning device or the evaporator frosting early warning system.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. An evaporator frosting early warning method is characterized by comprising the following steps:
when a vehicle heat pump system operates, acquiring preset parameters of the vehicle, wherein the preset parameters at least comprise low pressure of the heat pump system;
when the low pressure of the heat pump system is lower than a preset pressure, determining the actual heat exchange amount and the theoretical heat exchange limit of the evaporator;
and when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than a first preset value, giving out an evaporator frosting early warning.
2. The method of claim 1, wherein the obtaining the preset parameters of the vehicle comprises:
acquiring a working mode of a heat pump system, wherein the working mode comprises a heating mode and a refrigerating mode;
when the working mode is a heating mode, monitoring the continuous starting time of the compressor;
when the continuous start time of the compressor reaches a second preset value, at least one of the following preset parameters of the vehicle is acquired:
the heat pump system is low in pressure, the actual rotation speed of the evaporator area compressor, the vehicle speed, the front end fan gear and the ambient temperature.
3. The method of claim 1, wherein said determining the actual heat exchange amount and the theoretical heat exchange limit of the evaporator comprises:
the actual heat exchange amount of the evaporator was calculated by:
inquiring a first corresponding relation table according to the low pressure of the heat pump system to obtain an evaporator inlet enthalpy value, an evaporator outlet enthalpy value and a compressor suction density;
and calculating the actual heat exchange quantity of the evaporator according to the inlet enthalpy value of the evaporator, the outlet enthalpy value of the evaporator and the suction density of the compressor.
4. A method according to claim 3, wherein said calculating the actual heat exchange capacity of the evaporator based on said evaporator inlet enthalpy, evaporator outlet enthalpy and compressor suction density comprises:
the actual heat exchange amount of the evaporator is calculated by the following formula:
wherein w is act H is the actual heat exchange amount of the evaporator out For evaporator outlet enthalpy, h in For evaporator inlet enthalpy, r ho Suction density for the compressor.
5. The method of claim 1, wherein said determining the actual heat exchange amount and the theoretical heat exchange limit of the evaporator comprises:
the theoretical heat exchange limit of the evaporator is calculated by:
inquiring a second preset table according to the speed and the gear of the fan to obtain the speed of the evaporator, inquiring a third preset table according to the low pressure of the heat pump system to obtain the low pressure saturation temperature, and inquiring a fourth preset table according to the ambient temperature to obtain the air inlet density and the specific heat capacity;
and calculating the theoretical heat exchange limit of the evaporator according to the wind speed, the area of the evaporator, the air inlet density, the specific heat capacity, the low pressure of the system, the ambient temperature and the low pressure saturation temperature of the evaporator.
6. The method of claim 5, wherein said calculating theoretical heat exchange limits for said evaporator based on said evaporator wind speed, evaporator area, intake air density, specific heat capacity, system low pressure, ambient temperature, and low pressure saturation temperature comprises:
the theoretical heat exchange limit of the evaporator is calculated by the following formula:
w max ＝v×S×r hog ×cp×(T in -T Lp )；
wherein w is max For the theoretical heat exchange limit of the evaporator, v is the speed of the evaporator, S is the area of the evaporator, r hog Is air intake density, cp is specific heat capacity, T in At ambient temperature, T Lp Is a low pressure saturation temperature.
7. The method of claim 1, wherein the method further comprises:
and when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than a first preset value and the maintaining time is longer than a third preset value, sending out defrosting request information or controlling the heat pump system to enter a defrosting mode.
8. An evaporator frosting early warning device, characterized by comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring preset parameters of a vehicle when the vehicle heat pump system is running, and the preset parameters at least comprise low pressure of the heat pump system;
the determining module is used for determining the actual heat exchange amount and the theoretical heat exchange limit of the evaporator when the low pressure of the heat pump system is lower than the preset pressure;
and the early warning module is used for sending out the frost early warning of the evaporator when the ratio of the actual heat exchange amount of the evaporator to the theoretical heat exchange limit is smaller than a first preset value.
9. An evaporator frosting warning system, comprising:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores instructions executable by the at least one processor to implement the evaporator frost warning method of any of claims 1-7.
10. A computer readable storage medium, characterized in that instructions in the storage medium, when executed by a processor corresponding to an evaporator frost warning system, enable the evaporator frost warning system to implement the evaporator frost warning method of any of claims 1 to 7.
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| CN202310723111.4A CN116587806A (en) | 2023-06-16 | 2023-06-16 | Evaporator frosting early warning method, device and system and storage medium |
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