CN108016404B - Windshield defogging control method, control device and defogging system - Google Patents
Windshield defogging control method, control device and defogging system Download PDFInfo
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- CN108016404B CN108016404B CN201610972276.5A CN201610972276A CN108016404B CN 108016404 B CN108016404 B CN 108016404B CN 201610972276 A CN201610972276 A CN 201610972276A CN 108016404 B CN108016404 B CN 108016404B
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- evaporator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/023—Cleaning windscreens, windows or optical devices including defroster or demisting means
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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
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
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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
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/54—Cleaning windscreens, windows or optical devices using gas, e.g. hot air
Abstract
A windshield defogging control method, a control device and a defogging system are provided. The method comprises the following steps: respectively acquiring the current temperature of an air outlet of an evaporator, the current temperature of an air outlet of an air conditioner box assembly and defogging target control parameters of a windshield; comparing the current temperature of the air outlet of the evaporator with the corresponding target temperature, and comparing the current temperature of the air outlet of the air-conditioning box assembly with the corresponding target temperature to respectively obtain a first comparison result and a second comparison result; and adjusting the refrigerating capacity of the evaporator and the total heating capacity of the condenser in the automobile according to the first comparison result and the second comparison result, so that the current temperature of the air outlet of the evaporator and the current temperature of the air outlet of the air-conditioning box assembly are respectively equal to the corresponding target temperatures, and defogging is performed on the windshield. The cost of defogging the windshield can be reduced by applying the method.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to a windshield defogging control method, a windshield defogging device control device and a windshield defogging system.
Background
To improve the comfort of the vehicle, more and more vehicles are on the market equipped with air conditioning systems. The windshield of a vehicle is typically fogged when the temperature of the environment in which the vehicle is located is in the range of 0 c to 20 c. At this time, the air conditioning system of the vehicle enters a defogging mode to achieve the goal of defogging.
With the enhancement of energy conservation and environmental protection awareness, most of the air conditioning systems of the vehicles are heat pump air conditioning systems at present. For a vehicle adopting the heat pump air conditioning system, in a demisting mode, the aim of demisting the windshield can not be achieved only by the heat pump air conditioning system, but can be achieved only by the heating assistance of an auxiliary electric heater (HV-PTC).
Specifically, in the defogging mode, the air is cooled and dehumidified by the heat pump air conditioning system in the dehumidification mode, and then heated by the HV-PTC to raise the temperature of the HV-PTC air outlet to a comfortable temperature, and then sent to the passenger compartment to achieve the defogging purpose.
By adopting the defogging method, on one hand, the heat pump air conditioning system and the HV-PTC are required to be started simultaneously, so that the power consumption of the whole vehicle is large, and the endurance mileage is influenced; on the other hand, the HV-PTC with higher configuration cost is needed to meet the requirements of strong windshield defogging and passenger compartment comfort.
Disclosure of Invention
The embodiment of the invention solves the problem of reducing the defogging cost of the windshield.
In order to solve the above problem, an embodiment of the present invention provides a windshield defogging control method, where a heat pump air conditioning system is used to perform defogging, and the control method includes: obtain the current temperature of evaporimeter air outlet, the current temperature of air-conditioning box assembly air outlet respectively to and windshield defogging target control parameter, windshield defogging target control parameter includes: the target temperature of the air outlet of the evaporator and the target temperature of the air outlet of the air conditioner box assembly; comparing the current temperature of the air outlet of the evaporator with the corresponding target temperature, and comparing the current temperature of the air outlet of the air-conditioning box assembly with the corresponding target temperature to respectively obtain a first comparison result and a second comparison result; and adjusting the refrigerating capacity of the evaporator and the total heating capacity of the condenser in the automobile according to the first comparison result and the second comparison result, so that the current temperature of the air outlet of the evaporator and the current temperature of the air outlet of the air-conditioning box assembly are respectively equal to the corresponding target temperatures, and defogging is performed on the windshield.
Optionally, the adjusting the cooling capacity of the evaporator and the total heating capacity of the condenser in the vehicle according to the first comparison result and the second comparison result includes: when the current temperature of the air outlet of the air conditioner box assembly is lower than the corresponding target temperature and the current temperature of the air outlet of the evaporator is higher than the corresponding target temperature, the rotating speed of the electric compressor is increased; when the current temperature of the air outlet of the air conditioner box assembly is lower than the corresponding target temperature and the current temperature of the air outlet of the evaporator is lower than or equal to the corresponding target temperature, adjusting the area selected by the temperature air door motor to be a total heat area; when the current temperature of the air outlet of the air conditioner box assembly is higher than or equal to the corresponding target temperature and the current temperature of the air outlet of the evaporator is higher than the corresponding target temperature, the opening degree of the electronic expansion valve is reduced; and when the current temperature of the air outlet of the air conditioner box assembly is greater than or equal to the corresponding target temperature and the current temperature of the air outlet of the evaporator is less than the corresponding target temperature, reducing the rotating speed of the electric compressor.
Optionally, the control method further includes: and when the opening degree of the electronic expansion valve is positioned at a preset minimum opening degree and the current temperature of the air outlet of the evaporator is still higher than the corresponding target temperature, adjusting the rotating speed of the electric compressor and the area selected by the temperature air door motor.
Optionally, the adjusting the rotation speed of the electric compressor and the selected zone of the temperature damper motor comprises: and increasing the rotating speed of the electric compressor, and simultaneously controlling the selected area of the temperature air door motor to be a cold-hot mixed area.
Optionally, the control method further includes: and when the opening degree of the electronic expansion valve is positioned at a preset maximum opening degree and the current temperature of the air outlet of the evaporator is still lower than the corresponding target temperature, adjusting the circulating direction of the internal and external circulating motor and the rotating speed of the electric compressor.
Optionally, the adjusting the circulation direction of the internal and external circulation motor and the rotation speed of the electric compressor includes: and controlling the internal and external circulation motor to be full internal circulation and simultaneously increasing the rotating speed of the electric compressor.
The embodiment of the invention also provides a windshield defogging control device, which adopts a heat pump air conditioning system to defogg and comprises: the acquisition unit is suitable for respectively acquiring the current temperature of the air outlet of the evaporator, the current temperature of the air outlet of the air-conditioning box assembly and the defogging target control parameter of the windshield, wherein the defogging target control parameter of the windshield comprises: the target temperature of the air outlet of the evaporator and the target temperature of the air outlet of the air conditioner box assembly; the comparison unit is suitable for comparing the current temperature of the air outlet of the evaporator with the corresponding target temperature and comparing the current temperature of the air outlet of the air conditioner box assembly with the corresponding target temperature to respectively obtain a first comparison result and a second comparison result; and the first adjusting unit is suitable for adjusting the refrigerating capacity of the evaporator and the total heating capacity of the condenser in the automobile according to the first comparison result and the second comparison result so that the current temperature of the air outlet of the evaporator and the current temperature of the air outlet of the air-conditioning box assembly are respectively equal to the corresponding target temperatures, and accordingly defogging is performed on the windshield.
Optionally, the first adjusting unit includes: the first adjusting subunit is suitable for increasing the rotating speed of the electric compressor when the current temperature of the air outlet of the air conditioner box assembly is lower than the corresponding target temperature and the current temperature of the air outlet of the evaporator is higher than the corresponding target temperature; the second adjusting subunit is suitable for adjusting the area selected by the temperature air door motor to be a total heat area when the current temperature of the air outlet of the air conditioner box assembly is lower than the corresponding target temperature and the current temperature of the air outlet of the evaporator is lower than or equal to the corresponding target temperature; the third adjusting subunit is suitable for reducing the opening degree of the electronic expansion valve when the current temperature of the air outlet of the air conditioner box assembly is greater than or equal to the corresponding target temperature and the current temperature of the air outlet of the evaporator is greater than the corresponding target temperature; and the fourth adjusting subunit is suitable for reducing the rotating speed of the electric compressor when the current temperature of the air outlet of the air conditioner box assembly is greater than or equal to the corresponding target temperature and the current temperature of the air outlet of the evaporator is less than the corresponding target temperature.
Optionally, the control device further comprises: and the second adjusting unit is suitable for adjusting the rotating speed of the electric compressor and the area selected by the temperature air door motor when the opening degree of the electronic expansion valve is positioned at the preset minimum opening degree and the current temperature of the air outlet of the evaporator is still higher than the corresponding target temperature.
Optionally, the second adjusting unit is adapted to increase the rotation speed of the electric compressor and simultaneously control the area selected by the temperature damper motor to be a cold-hot mixed area when the opening degree of the electronic expansion valve is located at a preset minimum opening degree and the current temperature of the air outlet of the evaporator is still greater than the corresponding target temperature.
Optionally, the control device further comprises: and the third adjusting unit is suitable for adjusting the circulating direction of the internal and external circulating motor and the rotating speed of the electric compressor when the opening degree of the electronic expansion valve is positioned at the preset maximum opening degree and the current temperature of the air outlet of the evaporator is still lower than the corresponding target temperature.
Optionally, the third adjusting unit is adapted to control the internal and external circulation motor to be a full internal circulation and simultaneously increase the rotation speed of the electric compressor when the opening degree of the electronic expansion valve is located at a preset maximum opening degree and the current temperature of the air outlet of the evaporator is still less than the corresponding target temperature.
An embodiment of the present invention further provides a windshield defogging system, including: a windshield defogging control device and a heat pump air conditioning system; the windshield defogging control device is suitable for controlling the heat pump air conditioning system to defogge the windshield.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:
when the scheme is adopted to demist the windshield, the current temperature of the air outlet of the evaporator is compared with the corresponding target temperature, the current temperature of the air outlet of the air-conditioning box assembly is compared with the corresponding target temperature, the refrigerating capacity of the evaporator and the total heating capacity of the condenser in the automobile are adjusted according to the comparison result, and the purpose of demisting the windshield is finally achieved. In the scheme, the evaporator, the air conditioning box assembly or the electronic expansion valve is a component in the heat pump air conditioning system, and HV-PTC heating assistance is not needed, so that the defogging cost can be effectively reduced.
Drawings
FIG. 1 is a flow chart of a windshield defogging control method according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a windshield defogging system in accordance with an embodiment of the present invention;
FIG. 3 is a flow chart of another windshield defogging control method in accordance with an embodiment of the present invention;
fig. 4 is a schematic structural view of a windshield defogging control device according to an embodiment of the invention.
Detailed Description
At present, when the windshield is demisted, the air is cooled and dehumidified by a heat pump air conditioning system in a dehumidification mode, and then heated by the HV-PTC to raise the temperature of the HV-PTC air outlet to a comfortable temperature, and then sent to a passenger cabin to achieve the aim of demisting. The defogging process needs the heating assistance of the HV-PTC to achieve the aim of defogging the windshield, so that the defogging cost is high.
In view of the above problems, an embodiment of the present invention provides a defogging control method for a windshield, which is used for adjusting the cooling capacity of an evaporator and the total heating capacity of a condenser in a vehicle to achieve the purpose of defogging the windshield when the windshield is defogged. In the method, the evaporator, the air conditioning box assembly or the electronic expansion valve are all components in the heat pump air conditioning system, and HV-PTC heating assistance is not needed, so that the demisting cost is effectively reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, an embodiment of the present invention provides a defogging control method for a windshield, which may be implemented by a heat pump air conditioning system. First, in order to more clearly describe the method, the heat pump air conditioning system is explained as follows:
fig. 2 is a schematic structural diagram of a heat pump air conditioning system according to an embodiment of the present invention. Referring to fig. 2, the heat pump air conditioning system may include:
an electric compressor 21, an air conditioning box assembly 22, an outdoor heat exchanger 23, an electronic expansion valve 24, a two-way valve 25, a gas-liquid separator 26, and a controller 27. The solid lines represent air conditioner conduit connections and the dashed lines represent electrical connections. Wherein, the air conditioning box assembly 22 may include: an evaporator 221, a temperature damper motor 222, an in-vehicle condenser 223, an internal-external circulation motor 224, and a thermostatic expansion valve 225. One end of the electric compressor 21 is connected to the evaporator 221 via the gas-liquid separator 26, and the other end is connected to the internal condenser 223. One end of the outdoor heat exchanger 23 is connected to an interior condenser 223 via an electronic expansion valve 24, and the other end is connected to the evaporator 221. The internal condenser 223 is connected to the evaporator 221 via a two-way valve 25 and a thermostatic expansion valve 225. The controller 27 controls the operations of the two-way valve 25, the electronic expansion valve 24, the evaporator 221, the inside and outside circulation motor 224, and the temperature damper motor 222.
When the heat pump air conditioning system is used for demisting a windshield, firstly, the air with higher moisture content is cooled and dehumidified through the evaporator to obtain the air with lower temperature and moisture content, then the air treated by the evaporator is heated by the condenser in the automobile to obtain the air with higher temperature and lower moisture content, and finally the air treated by the condenser in the automobile is conveyed into a passenger cabin to achieve the purpose of comfortable demisting.
The following describes the defogging control method for the windshield in detail by taking the heat pump air conditioning system shown in fig. 2 as an example:
as shown in fig. 1, the method may include the steps of:
and 11, respectively acquiring the current temperature of the air outlet of the evaporator, the current temperature of the air outlet of the air conditioner box assembly and defogging target control parameters of the windshield.
In specific implementation, the current temperature CT1 of the air outlet of the evaporator and the current temperature CT2 of the air outlet of the air conditioner box assembly can be obtained in various ways. For example, referring to fig. 2, an evaporator temperature sensor 227 may be provided at the outlet of the evaporator 221, and an air conditioning box temperature sensor 226 may be provided at the outlet of the air conditioning box assembly 22.
In an implementation, the windshield defogging target control parameters may include: the target temperature TT1 of the air outlet of the evaporator and the target temperature TT2 of the air outlet of the air conditioner box assembly. Of course, other parameters, such as the air volume, the target temperature in the passenger compartment, etc., may also be obtained simultaneously. The control parameters of the defogging target of the windshield can be acquired through interface input or remote transmission, and the specific acquisition mode is not limited.
In a specific implementation, the above-mentioned windshield defogging control method may be implemented when the heat pump air conditioning system is in the dehumidification mode, or may be implemented in other modes, such as the refrigeration mode. It can be understood that no matter what mode, the aim of adjusting the temperature of the air outlet of the evaporator and the temperature of the air outlet of the air conditioning box assembly can be achieved by adjusting the refrigerating capacity of the evaporator and the heating capacity of the condenser in the vehicle.
And 12, comparing the current temperature of the air outlet of the evaporator with a corresponding target temperature, and comparing the current temperature of the air outlet of the air conditioner box assembly with the corresponding target temperature to respectively obtain a first comparison result and a second comparison result.
In the specific implementation, the comparison sequence of the air outlet temperature of the evaporator and the air outlet temperature of the air conditioning box is not limited. For example, the current temperature CT1 of the air outlet of the evaporator and the corresponding target temperature TT1 and the current temperature CT2 of the air outlet of the air-conditioning box assembly and the corresponding target temperature TT2 can be compared at the same time. Of course, the current temperature CT1 of the air outlet of the evaporator may be compared with the corresponding target temperature TT1, the current temperature CT2 of the air outlet of the air-conditioning box assembly may be compared with the corresponding target temperature TT2, the current temperature CT2 of the air outlet of the air-conditioning box assembly may be compared with the corresponding target temperature TT2, and the current temperature CT1 of the air outlet of the evaporator may be compared with the corresponding target temperature TT 1.
And step 13, adjusting the refrigerating capacity of the evaporator and the total heating capacity of the condenser in the automobile according to the first comparison result and the second comparison result, so that the current temperature of the air outlet of the evaporator and the current temperature of the air outlet of the air-conditioning box assembly are respectively equal to the corresponding target temperatures, and defogging the windshield.
In specific implementation, the evaporator can be controlled to cool and dehumidify air by adjusting the refrigerating capacity of the evaporator, so that air with corresponding moisture content is obtained. The temperature of the air outlet of the air conditioning box assembly can be controlled by adjusting the total heating capacity of the condenser in the vehicle, so that air with comfortable temperature can be obtained.
In a specific embodiment, since the heat pump air conditioning system satisfies the law of conservation of energy, referring to fig. 2, the total heating amount of the in-vehicle condenser 223 is equal to the power consumption of the electric compressor 21 + the cooling amount of the outdoor heater 23 + the cooling amount of the evaporator 221. Therefore, the total heating amount of the in-vehicle condenser 223 can be adjusted by adjusting at least one of the electric compressor 21, the out-vehicle heater 23, and the evaporator 221.
Fig. 3 is a flowchart of another windshield defogging control method according to an embodiment of the invention.
In a specific implementation, when a control command for starting defogging is received, the method for controlling defogging of the windshield according to the embodiment of the invention is started to be executed, and in the whole defogging control process, once the control command for ending defogging is received, the whole defogging control process is ended regardless of the currently specifically executed steps. In other words, the start and the end of the windshield defogging control method in the embodiment of the invention are controlled by the control instruction input by the user. The control instruction input by the user can be in various forms, and is not limited specifically. Moreover, the user can input the control command in various modes such as an operation interface, remote communication and the like.
The method will be described in detail with reference to fig. 2, taking the current temperature at the air outlet of the evaporator as CT1 and the current temperature at the air outlet of the air conditioning box assembly as CT2 as an example.
Referring to fig. 3, the method may include the steps of:
in step 301, CT1 and CT2 are acquired, respectively.
Here, the steps 301 and 302 can be implemented with reference to the above description of the steps 11 and 12, and are not described herein again.
In step 303, it is determined whether CT1 is equal to TT1 and CT2 is equal to TT 2.
Namely, whether the current temperature CT1 of the air outlet of the evaporator is equal to the corresponding target temperature TT1 and the current temperature CT2 of the air outlet of the air conditioner box assembly is equal to the corresponding target temperature TT2 are simultaneously determined.
When CT1 is TT1 and CT2 is TT2, continue to execute step 301, otherwise when CT1 ≦ TT1 and CT2 < TT2, execute step 304; when CT1 > TT1 and CT2 < TT2, performing step 310; when CT1 > TT1 and CT2 ≧ TT2, execute step 311; when CT1 ≦ TT1 and CT2 > TT2, step 314 is performed.
That is, the air with the moisture content and the temperature meeting certain conditions is conveyed into a passenger compartment, and the defogging of the windshield is realized.
And step 304, judging whether the temperature air door motor selects a full heat area or not when CT1 is not more than TT1 and CT2 is less than TT 2.
That is, when the current temperature CT1 of the air outlet of the evaporator reaches the corresponding target temperature TT1, it is determined whether the temperature damper motor selects the full hot zone.
In a specific implementation, a knob is typically provided on the temperature damper motor. The knob on the temperature air door motor is rotated to different areas, so that the refrigerating capacity of the evaporator and the total heating capacity of the condenser in the automobile are influenced to a certain extent. Specifically, by sequentially rotating the knob on the temperature damper motor to the full hot area, the cold and hot mixed area, and the full cold area, the cooling capacity of the evaporator is gradually increased, and the total heating capacity of the condenser in the vehicle is gradually decreased.
When the temperature damper motor selects the full hot zone, step 306 is performed, otherwise step 305 is performed.
When the temperature air door motor selects the total heat area, the total heating capacity of the condenser in the vehicle is increased, so that the current temperature CT2 of the air outlet of the air conditioning box assembly reaches the corresponding target temperature TT 2.
In step 306, the opening degree of the electronic expansion valve is increased.
In a specific implementation, referring to fig. 2, increasing the opening of the electronic expansion 24 may increase the cooling capacity of the outdoor heat exchanger 23. Under the condition that the total cooling capacity of the heat pump air conditioning system is not changed, the cooling capacity of the outdoor heat exchanger 23 is increased, so that the cooling capacity of the evaporator 221 is reduced, and the current temperature CT1 of the air outlet of the evaporator 221 can be increased.
And 307, judging whether the opening degree of the electronic expansion valve reaches the maximum opening degree and CT1 is less than TT 1.
That is, when the opening degree of the electronic expansion valve reaches the maximum opening degree, whether the current temperature CT1 of the air outlet of the evaporator is still less than the corresponding target temperature TT1 is determined.
It should be noted that, in a specific implementation, the opening degree of the electronic expansion valve may be increased according to a preset step size, and after the opening degree of the electronic expansion valve is increased each time, the current temperature CT1 of the air outlet of the evaporator and the current temperature CT2 of the air outlet of the air conditioning box assembly are obtained again, and CT1 and TT1 are compared, and CT2 and TT2 are compared, and a corresponding operation is performed according to the comparison result. If the current temperature CT1 of the air outlet of the evaporator is equal to the corresponding target temperature TT1 before the opening degree of the electronic expansion valve reaches the maximum opening degree, step 306 does not need to be executed.
When the opening degree of the electronic expansion valve reaches the maximum opening degree, the current temperature CT1 of the air outlet of the evaporator is still less than the corresponding target temperature TT1, step 308 is executed, otherwise, the opening degree of the electronic expansion valve can be continuously increased, that is, step 306 is continuously executed.
And 308, judging whether the internal and external circulation motor is full internal circulation or not.
And executing step 301 when the internal and external circulation motor is full internal circulation, otherwise executing step 309.
The rotation direction of the internal and external circulation motors is controlled to enable the internal circulation motors to operate in the internal circulation direction, so that the load of the evaporator can be increased, and the current temperature CT1 of the air outlet of the evaporator can be increased.
And step 310, when CT1 is larger than TT1 and CT2 is smaller than TT2, increasing the rotating speed of the electric compressor.
By increasing the rotation speed of the electric compressor, the total refrigerating capacity of the heat pump air conditioning system can be increased, and the refrigerating capacity of the evaporator can also be increased. The increase in the cooling capacity of the evaporator will cause the current temperature CT1 at the outlet of the evaporator to decrease.
According to the energy conservation principle, the total cooling capacity of the heat pump air-conditioning system is improved, namely the total heating capacity of the heat pump air-conditioning system is improved, so that the current temperature CT2 of the air outlet of the air-conditioning box assembly can be improved.
And 311, when the CT1 is more than TT1 and the CT2 is more than or equal to TT2, reducing the opening degree of the electronic expansion valve.
By reducing the opening degree of the electronic expansion valve, the refrigerating capacity of the outdoor heat exchanger can be reduced. Under the condition that the total refrigerating capacity of the heat pump air conditioning system is not changed, the refrigerating capacity of the outdoor heat exchanger is reduced, the refrigerating capacity of the evaporator can be correspondingly improved, and the current temperature CT1 of the air outlet of the evaporator can be reduced.
And step 312, judging whether the opening degree of the electronic expansion valve reaches the minimum opening degree and CT1 is greater than TT 1.
Namely, when the opening degree of the electronic expansion valve reaches the minimum opening degree, whether the current temperature CT1 of the air outlet of the evaporator is still greater than the corresponding target temperature TT1 is judged.
It should be noted that, in a specific implementation, the opening degree of the electronic expansion valve may be decreased according to a preset step size, and after the opening degree of the electronic expansion valve is decreased each time, the current temperature CT1 of the air outlet of the evaporator and the current temperature CT2 of the air outlet of the air conditioning box assembly are obtained again, and CT1 and TT1 are compared, and CT2 and TT2 are compared, and a corresponding operation is performed according to the comparison result. If the current temperature CT1 of the air outlet of the evaporator is equal to the corresponding target temperature TT1 before the opening degree of the electronic expansion valve is reduced to the minimum opening degree, step 313 does not need to be executed.
When the opening degree of the electronic expansion valve is the minimum opening degree, the current temperature CT1 of the air outlet of the evaporator is still greater than the corresponding target temperature TT1, step 313 is executed, otherwise, the opening degree of the electronic expansion valve can be continuously reduced, that is, step 311 is continuously executed.
After the opening degree of the electronic expansion valve reaches the minimum opening degree, the rotating speed of the electric compressor is increased, the refrigerating capacity of the evaporator can be further increased, and the current temperature CT1 of the air outlet of the evaporator is reduced.
Meanwhile, the temperature air door motor is controlled to select a cold and hot mixing area, so that the refrigerating capacity of the evaporator can be further improved, and the total heating capacity of the condenser in the automobile can be reduced, so that the current temperature CT1 of the air outlet of the evaporator can be further reduced, and the current temperature CT2 of the air outlet of the air conditioner box assembly can be reduced.
It should be noted that, although the current temperature CT2 of the air outlet of the air conditioning box assembly can be increased by increasing the rotation speed of the electric compressor, in a specific implementation, the decrease range of the current temperature CT2 of the air outlet of the air conditioning box assembly by selecting the cold and hot mixing area by controlling the temperature damper motor is usually greater than the increase range of the current temperature CT2 of the air outlet of the air conditioning box assembly by increasing the rotation speed of the electric compressor when the current temperature CT1 of the air outlet of the evaporator reaches the corresponding target temperature. Therefore, in general, increasing the speed of the electric compressor and controlling the temperature damper motor to select the cold and hot mixing region will still decrease the current temperature CT2 at the outlet of the air conditioning cabinet assembly.
And step 314, when the CT1 is less than or equal to TT1 and the CT2 is more than TT2, reducing the rotating speed of the electric compressor.
By reducing the rotating speed of the electric compressor, the total heating capacity of the condenser in the vehicle and the cooling capacity of the evaporator can be reduced, so that the current temperature CT2 of the air outlet of the air conditioning box assembly and the current temperature CT1 of the air outlet of the evaporator can be increased simultaneously.
It should be noted that, when the above-mentioned defogging control method for a windshield is used for defogging, since the current temperature CT1 of the air outlet of the evaporator is usually greater than the corresponding target temperature TT1, and the current temperature CT2 of the air outlet of the air-conditioning box assembly is usually less than the corresponding target temperature, in a specific implementation, in order to improve the defogging efficiency, after receiving a defogging control command from a user, the electric compressor may be started and the rotation speed of the electric compressor may be increased, so as to reduce the current temperature CT1 of the air outlet of the evaporator and the current temperature CT2 of the air outlet of the air-conditioning box assembly. After the preset time duration, executing the steps 301 to 315. The preset time length can be set by a person in the art according to actual conditions.
It should be noted that, in the process of defogging by using the above-mentioned method for controlling defogging of a windshield, the target temperature TT1 of the air outlet of the evaporator and the target temperature TT2 of the air outlet of the air-conditioning box assembly may also be adjusted, but no matter what the specific values of the target temperature TT1 of the air outlet of the evaporator and the target temperature TT2 of the air outlet of the air-conditioning box assembly are, when comparing CT1 with TT1 and CT2 with TT2, a corresponding comparison result is obtained according to the current target temperature TT1 of the air outlet of the evaporator and the target temperature TT2 of the air outlet of the air-conditioning box assembly, and the operation after the comparison is executed.
In a specific implementation, the structure of the heat pump air conditioning system is not limited to the structure illustrated in the above embodiments, and other structures may exist, for example, the heat pump air conditioning system may add other components or reduce some components. However, no matter what the specific structure is, as long as the defogging method of the embodiment of the invention can be adopted to achieve defogging of the windshield, no limitation is made to the embodiment of the invention, and the embodiment of the invention is within the protection scope of the invention.
From the above, the defogging control method for the windshield in the embodiment of the invention only utilizes the components in the heat pump air conditioning system, and does not need to use the HV-PTC for heating assistance, thereby effectively reducing the defogging cost.
In order to make the embodiment of the present invention better understood and realized by those skilled in the art, a device corresponding to the above-described defogging control method for a windshield will be described in detail.
Referring to fig. 4, an embodiment of the present invention provides a windshield defogging control device 40, wherein the device 40 utilizes a heat pump air conditioning system to perform defogging.
Specifically, the apparatus 40 may include: an acquisition unit 41, a comparison unit 42, and a first adjustment unit 43. Wherein:
the obtaining unit 41 is adapted to obtain a current temperature of an air outlet of the evaporator, a current temperature of an air outlet of the air conditioning box assembly, and a defogging target control parameter of the windshield, where the defogging target control parameter of the windshield includes: the target temperature of the air outlet of the evaporator and the target temperature of the air outlet of the air conditioner box assembly;
the comparing unit 42 is adapted to compare the current temperature of the air outlet of the evaporator with a corresponding target temperature, and compare the current temperature of the air outlet of the air conditioning box assembly with the corresponding target temperature to obtain a first comparison result and a second comparison result respectively;
the first adjusting unit 43 is adapted to adjust the cooling capacity of the evaporator and the total heating capacity of the condenser in the vehicle according to the first comparison result and the second comparison result, so that the current temperature of the air outlet of the evaporator and the current temperature of the air outlet of the air conditioning box assembly are respectively equal to the respective corresponding target temperatures, and the windshield is demisted.
In an embodiment of the present invention, the first adjusting unit 43 may include: a first adjusting subunit 431, a second adjusting subunit 432, a third adjusting subunit 433, and a fourth adjusting subunit 444. Wherein:
the first adjusting subunit 431 is adapted to increase the rotation speed of the electric compressor when the current temperature of the air outlet of the air conditioning box assembly is lower than the corresponding target temperature and the current temperature of the air outlet of the evaporator is higher than the corresponding target temperature;
the second adjusting subunit 432 is adapted to adjust the area selected by the temperature damper motor to be a total heat area when the current temperature of the air outlet of the air conditioning box assembly is lower than the corresponding target temperature and the current temperature of the air outlet of the evaporator is lower than or equal to the corresponding target temperature;
the third adjusting subunit 433 is adapted to decrease the opening degree of the electronic expansion valve when the current temperature of the air outlet of the air conditioning box assembly is greater than or equal to the corresponding target temperature and the current temperature of the air outlet of the evaporator is greater than the corresponding target temperature;
the fourth adjusting subunit 444 is adapted to decrease the rotation speed of the electric compressor when the current temperature of the air outlet of the air conditioning box assembly is greater than or equal to the corresponding target temperature and the current temperature of the air outlet of the evaporator is less than the corresponding target temperature.
In another embodiment of the present invention, the control device 40 may further include: a second adjusting unit 44. The second adjusting unit 44 is adapted to adjust the rotation speed of the electric compressor and the selected area of the temperature damper motor when the opening degree of the electronic expansion valve is at a preset minimum opening degree and the current temperature of the air outlet of the evaporator is still higher than the corresponding target temperature.
In a specific implementation, the second adjusting unit 44 is adapted to increase the rotation speed of the electric compressor and simultaneously control the area selected by the temperature damper motor to be a cold-hot mixed area when the opening degree of the electronic expansion valve is at a preset minimum opening degree and the current temperature of the air outlet of the evaporator is still greater than the corresponding target temperature.
In another embodiment of the present invention, the control device 40 may further include: and a third adjusting unit 45. The third adjusting unit 45 is adapted to adjust the circulation direction of the internal and external circulation motor and the rotation speed of the electric compressor when the opening degree of the electronic expansion valve is at a preset maximum opening degree and the current temperature of the air outlet of the evaporator is still lower than the corresponding target temperature.
In a specific implementation, the third adjusting unit 45 is adapted to control the internal and external circulation motor to be a full internal circulation and simultaneously increase the rotation speed of the electric compressor when the opening degree of the electronic expansion valve is located at a preset maximum opening degree and the current temperature of the air outlet of the evaporator is still less than the corresponding target temperature.
The embodiment of the invention also provides a windshield defogging system. The system may include: the windshield defogging control device and the heat pump air conditioning system are arranged on the windshield; the windshield defogging control device is suitable for controlling the heat pump air conditioning system to defogge the windshield.
In an implementation, referring to fig. 2, the windshield defogging control device may be integrated into the controller 27, or may be provided separately from the controller 27, without limitation. Under the control of the windshield defogging control device, the windshield defogging can be realized only by utilizing the self component of the heat pump air conditioning system. The windshield in the embodiment of the invention comprises a front windshield and a rear windshield, and the defogging can be carried out by utilizing the defogging control method in the embodiment of the invention no matter the front windshield or the rear windshield.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A windshield defogging control method is characterized in that a heat pump air conditioning system is adopted for defogging, and the method comprises the following steps:
obtain the current temperature of evaporimeter air outlet, the current temperature of air-conditioning box assembly air outlet respectively to and windshield defogging target control parameter, windshield defogging target control parameter includes: the target temperature of the air outlet of the evaporator and the target temperature of the air outlet of the air conditioner box assembly;
comparing the current temperature of the air outlet of the evaporator with the target temperature of the air outlet of the evaporator, and comparing the current temperature of the air outlet of the air-conditioning box assembly with the target temperature of the air outlet of the air-conditioning box assembly to respectively obtain a first comparison result and a second comparison result;
according to the first comparison result and the second comparison result, adjusting the refrigerating capacity of an evaporator and the total heating capacity of an in-vehicle condenser to enable the current temperature of the air outlet of the evaporator to be equal to the target temperature of the air outlet of the evaporator and the current temperature of the air outlet of the air-conditioning box assembly to be equal to the target temperature of the air outlet of the air-conditioning box assembly, so as to demist the windshield;
wherein, according to the first comparison result and the second comparison result, adjusting the refrigerating capacity of the evaporator and the total heating capacity of the condenser in the vehicle comprises:
when the current temperature of the air outlet of the air conditioner box assembly is lower than the target temperature of the air outlet of the air conditioner box assembly and the current temperature of the air outlet of the evaporator is higher than the target temperature of the air outlet of the evaporator, the rotating speed of the electric compressor is increased;
when the current temperature of the air outlet of the air conditioner box assembly is lower than the target temperature of the air outlet of the air conditioner box assembly and the current temperature of the air outlet of the evaporator is lower than or equal to the target temperature of the air outlet of the evaporator, adjusting the area selected by the temperature air door motor to be a total heat area;
when the current temperature of the air outlet of the air conditioner box assembly is greater than or equal to the target temperature of the air outlet of the air conditioner box assembly and the current temperature of the air outlet of the evaporator is greater than the target temperature of the air outlet of the evaporator, reducing the opening degree of the electronic expansion valve;
and when the current temperature of the air outlet of the air conditioner box assembly is greater than or equal to the target temperature of the air outlet of the air conditioner box assembly and the current temperature of the air outlet of the evaporator is less than the target temperature of the air outlet of the evaporator, reducing the rotating speed of the electric compressor.
2. The windshield defogging control method according to claim 1, further comprising: and when the opening degree of the electronic expansion valve is positioned at a preset minimum opening degree and the current temperature of the air outlet of the evaporator is still higher than the target temperature of the air outlet of the evaporator, adjusting the rotating speed of the electric compressor and the area selected by the temperature air door motor.
3. A windshield defogging control method as recited in claim 2 wherein said adjusting the speed of the electric compressor and the selected zone of the temperature damper motor comprises:
and increasing the rotating speed of the electric compressor, and simultaneously controlling the selected area of the temperature air door motor to be a cold-hot mixed area.
4. The windshield defogging control method according to claim 1, further comprising: and when the opening degree of the electronic expansion valve is positioned at a preset maximum opening degree and the current temperature of the air outlet of the evaporator is still lower than the target temperature of the air outlet of the evaporator, adjusting the circulating direction of the internal and external circulating motor and the rotating speed of the electric compressor.
5. The windshield defogging control method according to claim 4 wherein said adjusting the direction of circulation of the internal and external circulation motor and the speed of rotation of the electric compressor comprises:
and controlling the internal and external circulation motor to be full internal circulation and simultaneously increasing the rotating speed of the electric compressor.
6. The utility model provides a windshield defogging controlling means which characterized in that adopts heat pump air conditioning system to defogge, includes:
the acquisition unit is suitable for respectively acquiring the current temperature of the air outlet of the evaporator, the current temperature of the air outlet of the air-conditioning box assembly and the defogging target control parameter of the windshield, wherein the defogging target control parameter of the windshield comprises: the target temperature of the air outlet of the evaporator and the target temperature of the air outlet of the air conditioner box assembly;
the comparison unit is suitable for comparing the current temperature of the air outlet of the evaporator with the target temperature of the air outlet of the evaporator, and comparing the current temperature of the air outlet of the air-conditioning box assembly with the target temperature of the air outlet of the air-conditioning box assembly to respectively obtain a first comparison result and a second comparison result;
the first adjusting unit is suitable for adjusting the refrigerating capacity of the evaporator and the total heating capacity of the condenser in the automobile according to the first comparison result and the second comparison result so that the current temperature of the air outlet of the evaporator is equal to the target temperature of the air outlet of the evaporator and the current temperature of the air outlet of the air-conditioning box assembly is equal to the target temperature of the air outlet of the air-conditioning box assembly, and accordingly defogging is performed on the windshield;
wherein the first adjusting unit includes:
the first adjusting subunit is suitable for increasing the rotating speed of the electric compressor when the current temperature of the air outlet of the air conditioner box assembly is lower than the target temperature of the air outlet of the air conditioner box assembly and the current temperature of the air outlet of the evaporator is higher than the target temperature of the air outlet of the evaporator;
the second adjusting subunit is suitable for adjusting the area selected by the temperature air door motor to be a total heat area when the current temperature of the air outlet of the air conditioner box assembly is lower than the target temperature of the air outlet of the air conditioner box assembly and the current temperature of the air outlet of the evaporator is lower than or equal to the target temperature of the air outlet of the evaporator;
the third adjusting subunit is suitable for reducing the opening degree of the electronic expansion valve when the current temperature of the air outlet of the air conditioner box assembly is greater than or equal to the target temperature of the air outlet of the air conditioner box assembly and the current temperature of the air outlet of the evaporator is greater than the target temperature of the air outlet of the evaporator;
and the fourth adjusting subunit is suitable for reducing the rotating speed of the electric compressor when the current temperature of the air outlet of the air conditioner box assembly is greater than or equal to the target temperature of the air outlet of the air conditioner box assembly and the current temperature of the air outlet of the evaporator is less than the target temperature of the air outlet of the evaporator.
7. The windshield defogging control device as recited in claim 6 further comprising:
and the second adjusting unit is suitable for adjusting the rotating speed of the electric compressor and the area selected by the temperature air door motor when the opening degree of the electronic expansion valve is positioned at the preset minimum opening degree and the current temperature of the air outlet of the evaporator is still higher than the target temperature of the air outlet of the evaporator.
8. The windshield defogging control device according to claim 7 wherein said second adjustment unit is adapted to increase the speed of said motor-driven compressor and simultaneously control the selected zone of the temperature damper motor to be a cold-hot mixing zone when the opening of said electronic expansion valve is at a predetermined minimum opening and the current temperature of said evaporator air outlet is still greater than the target temperature of said evaporator air outlet.
9. The windshield defogging control device as recited in claim 6 further comprising:
and the third adjusting unit is suitable for adjusting the circulating direction of the internal and external circulating motor and the rotating speed of the electric compressor when the opening degree of the electronic expansion valve is positioned at the preset maximum opening degree and the current temperature of the air outlet of the evaporator is still lower than the target temperature of the air outlet of the evaporator.
10. The control device for defogging of the windshield according to claim 9, wherein said third adjusting unit is adapted to control said internal-external circulation motor to be a full internal circulation and simultaneously increase the rotation speed of the electric compressor when the opening degree of said electronic expansion valve is at the preset maximum opening degree and the current temperature of said evaporator air outlet is still less than the target temperature of said evaporator air outlet.
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| CN201610972276.5A CN108016404B (en) | 2016-11-04 | 2016-11-04 | Windshield defogging control method, control device and defogging system |
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| CN201610972276.5A CN108016404B (en) | 2016-11-04 | 2016-11-04 | Windshield defogging control method, control device and defogging system |
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| CN109733158B (en) * | 2019-02-19 | 2020-09-11 | 宁波吉利汽车研究开发有限公司 | Vehicle window glass instantaneous fogging prevention system, instantaneous fogging prevention method and vehicle |
| CN110334382B (en) * | 2019-05-09 | 2020-11-17 | 电子科技大学 | Automobile window fogging condition prediction method based on cyclic neural network |
| CN112896097B (en) * | 2021-04-06 | 2022-07-12 | 浙江吉利控股集团有限公司 | Control method and device of vehicle cold-warm defrosting system, vehicle and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2000025446A (en) * | 1998-07-09 | 2000-01-25 | Denso Corp | Air conditioner |
| JPWO2011125694A1 (en) * | 2010-03-31 | 2013-07-08 | 本田技研工業株式会社 | Heat pump air conditioning system for vehicles |
| KR101276225B1 (en) * | 2011-02-15 | 2013-06-24 | 한라비스테온공조 주식회사 | Heat pump system for vehicle |
| JP2013129353A (en) * | 2011-12-22 | 2013-07-04 | Mitsubishi Heavy Ind Ltd | Air conditioning apparatus for vehicle |
| JP2013154749A (en) * | 2012-01-30 | 2013-08-15 | Denso Corp | Vehicle air conditioner |
| JP6257940B2 (en) * | 2013-07-11 | 2018-01-10 | 三菱重工オートモーティブサーマルシステムズ株式会社 | Heat pump type vehicle air conditioning system and defrosting method thereof |
| JP6295676B2 (en) * | 2014-01-21 | 2018-03-20 | 株式会社デンソー | Heat pump cycle |
| JP6418787B2 (en) * | 2014-05-26 | 2018-11-07 | サンデンホールディングス株式会社 | Air conditioner for vehicles |
| US10302346B2 (en) * | 2014-07-16 | 2019-05-28 | Ford Global Technologies, Llc | Maximizing defrost mode in electrified vehicle having dual evaporator and dual heater core climate control system |
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