CN114590228A - Method for operating a vehicle-mounted air conditioning system of a motor vehicle and defogging system - Google Patents
Method for operating a vehicle-mounted air conditioning system of a motor vehicle and defogging system Download PDFInfo
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- CN114590228A CN114590228A CN202011403826.4A CN202011403826A CN114590228A CN 114590228 A CN114590228 A CN 114590228A CN 202011403826 A CN202011403826 A CN 202011403826A CN 114590228 A CN114590228 A CN 114590228A
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- defogging
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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
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Abstract
The invention relates to a method for operating a vehicle-mounted air conditioning system of a motor vehicle and a demisting system, comprising the following steps: 1) acquiring the ambient temperature around the motor vehicle; 2) acquiring the current speed of the motor vehicle; 3) determining air duct control parameters according to the acquired environmental temperature and the acquired vehicle speed; 4) switching the vehicle-mounted air conditioner into an internal ventilation mode or an external ventilation mode according to the determined air duct control parameters; 5) opening an air duct in the windshield area for defogging; wherein steps 1) and 2) may be performed in parallel or in reverse order. By means of the method and the system, one or more of ambient temperature, humidity, vehicle speed and humidity signals of a windshield area are comprehensively evaluated, and the inside and outside ventilation, air ducts and an air conditioner of the automobile are intelligently switched based on the evaluation result without manual operation of a driver, so that the fog of the windshield is prevented, and meanwhile, harmful gas is prevented from flowing into the automobile.
Description
Technical Field
The invention relates to the technical field of motor vehicle electronics, in particular to a method for operating a vehicle-mounted air conditioning system of a motor vehicle and a demisting system.
Background
When the humidity in the motor vehicle is relatively high and the temperature difference between the inside and the outside of the front windshield glass is larger than a certain value, water vapor in the air in the motor vehicle can be condensed on the inner surface of the windshield glass to form a water film, which is commonly called as a fogging phenomenon. The front windshield glass of the motor vehicle can cause the vision blind area of a driver to be increased after being fogged, and even can cause the front windshield to be completely covered by fog, thereby seriously blocking the sight of the driver and further threatening the driving safety. In order to ensure driving safety, the water mist of the front windshield glass needs to be removed in time. When it is found that the windshield is fogged, air having a relatively low humidity is generally used to blow directly on the inner surface of the windshield, so that the condensed mist is evaporated.
It is also well known that emissions from motor vehicles at low temperatures rise dramatically and that the motor vehicles continue to emit irritating smelling exhaust gases, colloquially known as "choking", for a period of time after a cold start of the motor vehicle. Particularly in the northeast of China, if the vehicle is parked in an open air place in winter, the driver should open the external ventilation every time driving, so that the external air takes away the moisture in the air in the vehicle, and excessive moisture is prevented from adhering to the surface of the glass to frost when the temperature is reduced at night. If the external ventilation is started, the choked motor vehicle exhaust gas often flows into the vehicle through the external ventilation, a driver often closes the external ventilation after smelling the smell, and harmful gas which can enter the vehicle cannot be exhausted.
It is therefore desirable to provide an improved method for operating an air conditioning system on board a motor vehicle, which overcomes the above-mentioned technical problems of the prior art and solves them in a more intelligent manner than the solutions of the prior art.
Disclosure of Invention
The invention aims to provide a method for operating an air conditioning system on board a motor vehicle and a defogging system, by means of which the internal and external ventilation, air ducts and air conditioning of the vehicle can be intelligently switched based on the evaluation result by comprehensively evaluating one or more of ambient temperature, humidity, vehicle speed and humidity signals of a windshield area, without manual operation of a driver, thereby preventing the windshield from fogging and preventing harmful gas from flowing into the vehicle.
According to one aspect of the invention, this object is achieved by a method for operating an air conditioning system on board a motor vehicle, comprising the following steps:
1) acquiring the ambient temperature around the motor vehicle;
2) acquiring the current speed of the motor vehicle;
3) determining air duct control parameters according to the acquired environmental temperature and the acquired vehicle speed;
4) switching the vehicle-mounted air conditioner into an internal ventilation mode or an external ventilation mode according to the determined air duct control parameters;
5) opening an air duct in the windshield area for defogging;
wherein steps 1) and 2) may be performed in parallel or in reverse order.
In the above method, the ambient temperature and the vehicle speed can be determined by sensors which are originally provided on the vehicle. And determining whether the outer ventilation mode is adopted for defogging or the inner ventilation mode is adopted for defogging at present through evaluation and analysis of the ambient temperature and the vehicle speed. Therefore, the windshield can be prevented from being fogged, and meanwhile, harmful gas can be prevented from flowing into the vehicle. Obviously, in this method, steps 1) and 2) can be performed in parallel or in reverse order. The windscreen is preferably a front or rear windscreen.
Preferably, the air passage control parameter is determined from the acquired ambient temperature and vehicle speed by a correspondence table or a characteristic curve stored in advance. The corresponding relation table and the characteristic curve respectively describe the corresponding relation between the environmental temperature, the vehicle speed and the air duct control parameter in the form of a table or a graph. The correspondence table and the characteristic curve can be set by the vehicle manufacturer, for example, empirically or experimentally in advance. It is also conceivable to determine the air duct control parameters from the ambient temperature and the vehicle speed by means of an algorithm.
According to a preferred embodiment of the invention, the air humidity of the windscreen region is also detected, and the defogging is automatically performed or the driver is prompted to perform the defogging only when the air humidity is higher than a predetermined threshold value. Thus, the accuracy of the defogging operation is further improved, so that the defogging operation is performed only when the air humidity is high and the possibility of fogging is high. This preferred function is particularly useful in rainy weather.
Preferably, the manner in which the defogging operation is performed is selected according to the user's setting. If the user sets the vehicle-mounted air conditioner to be in the intelligent demisting mode, the intelligent demisting function is started, and in the intelligent demisting mode, the internal and external ventilation, the air channel and the air conditioner are controlled by the system controller; if the anti-fog reminding function is only started, the system operates in the anti-fog reminding mode, and when the windshield has a fogging risk, the control system prompts a driver to give an early warning, so that the driver can perform corresponding operation to prevent the windshield from fogging; if the intelligent defogging and antifogging reminding functions are both off, the manual control is completely carried out by the driver in the manual mode. The driver can make the mode selection by different keys.
In the anti-fog reminding mode, if the air humidity in the windshield area is detected to be higher than a specific threshold value, a driver is reminded that the windshield is in danger of fogging, and a defogging operation is recommended, such as switching to an external ventilation mode and opening an air duct in the windshield area for defogging.
Preferably, the driver is alerted to defog visually and/or audibly. The driver can be alerted, for example, by a liquid crystal screen of the dashboard or by a loudspeaker system in the interior of the motor vehicle: windscreens are at risk of fogging and a defogging operation is recommended.
Preferably, the air conditioner starting condition is additionally judged, and if the judgment result is 'true', the air conditioner is automatically started; and if the judgment result is 'false', maintaining the current air conditioner setting unchanged, wherein the judgment of the air conditioner starting condition comprises comprehensive evaluation on the environment temperature, the function of the air conditioner system is intact and the environment humidity. The operation of the motor vehicle air conditioner can be started or closed or maintained under the condition that the air conditioner is in good function by combining the environmental temperature and the environmental humidity and according to the preset corresponding relation. This allows the defogging to be performed while maintaining the optimum comfort for the occupants of the vehicle.
Preferably, demisting is stopped after a certain duration, for example after ten or fifteen minutes; or stop defogging upon detection of an air humidity in the windshield area below another predetermined threshold.
According to another aspect of the present invention, the object is achieved by a defogging system for defogging a windshield of a motor vehicle, comprising an ambient temperature sensor, a vehicle speed sensor, a system controller and a storage module, wherein the system controller is in signal connection with the ambient temperature sensor and the vehicle speed sensor, wherein a correspondence table and a characteristic curve describing a correspondence between an ambient temperature, a vehicle speed and an airway control parameter are pre-stored in the storage module, and the system controller is configured to determine the airway control parameter according to the ambient temperature and the vehicle speed provided by the ambient temperature sensor and the vehicle speed sensor and to drive and control the airway according to the corresponding airway control parameter to defogg the windshield.
Preferably, the memory module is integrated in a system controller. That is, the memory module is configured as part of the system controller.
Drawings
Further characteristics and advantages of the invention are given by the following description of a preferred embodiment with the aid of the drawings.
The embodiments shown in the figures are only possible embodiments of the invention, and the features contained in the description, the claims and the drawings can also be combined with one another in different ways to give other different solutions. It should be understood that the invention is not limited to the particular embodiments described and illustrated. Rather, it is contemplated that the invention may be practiced with any combination of the following features and elements, whether or not they relate to different embodiments. Thus, the various features, embodiments and advantages are merely illustrative and are not considered elements or limitations of the claims.
The figures show:
FIG. 1 shows a flow diagram of an embodiment of the method according to the invention;
FIG. 2 shows a flowchart of a defogging operation including a smart defogging mode, an anti-fog reminder mode, and a manual mode;
fig. 3 shows a correspondence table describing the correspondence between the ambient temperature, the vehicle speed, and the air passage control parameter.
Detailed Description
Fig. 1 shows a flow chart of an embodiment of a method according to the invention for operating an on-board air conditioning system of a motor vehicle. As shown in fig. 1, in step 1, the ambient temperature around the motor vehicle is detected by a temperature sensor of the motor vehicle, and in step 2, the current speed of the motor vehicle is detected by a speed sensor of the motor vehicle. It is obvious that steps 1 and 2 can be performed in parallel or in reverse order here. In step 3, the ambient temperature signal and the vehicle speed signal are fed to a system controller which determines air duct control parameters from the acquired ambient temperature and vehicle speed, for example based on a correspondence table and a characteristic curve describing the correspondence between ambient temperature, vehicle speed and air duct control parameters. Of course, it may also be determined by an algorithm. After determining the air duct control parameters, the system controller switches the vehicle air conditioner to the inside ventilation or outside ventilation mode according to the determined air duct control parameters in step 4 and opens the air duct of the windshield area for defogging in step 5. Automatically stopping defogging after a certain time period following the start of defogging, for example, ten or fifteen minutes; or stopping defogging upon detecting that the air humidity in the windshield area is below another predetermined threshold. Of course, it is also conceivable to stop the defogging manually by the driver. For example, the driver may stop defogging via a button disposed on the instrument panel.
The correspondence table and the characteristic curve may be set by the vehicle manufacturer, for example, empirically or experimentally in advance and stored in advance in the memory module of the system controller. It is also conceivable to acquire these correspondence tables and characteristic curves online. Thereby, the specific climate conditions of different regions can be matched more flexibly.
FIG. 2 shows a flowchart of a defogging operation including a smart defogging mode, an anti-fog reminder mode, and a manual mode. The flow and each step therein are described below in connection with fig. 2:
1. whether intelligent defogging key is pressed down is judged by vehicle-mounted system of motor vehicle
If yes, the intelligent defogging function is started and jumps to 2;
-if no, jump to 1.1;
1.1 the vehicle-mounted system judges whether the antifogging reminding function is started or not
If so, the anti-fog reminder function is turned on, jumping to 2.1;
if not, the intelligent defogging and antifogging reminding functions are both closed, and the process jumps to 2.2;
2. judging windshield area humidity under intelligent demisting mode
Jump to 3 if the windshield area humidity is greater than or equal to the threshold value H1.
-if the windshield area humidity is less than the threshold value H1, a jump to 2.2,
2.1 judging the humidity of the windshield area in the antifogging reminding mode
Jump to 3.1 if the windshield area humidity is greater than or equal to the threshold value H2.
-if the windshield area humidity is less than the threshold value H2, a jump to 2.2,
2.2 the vehicle-mounted system of the motor vehicle controls the internal and external ventilation and the air channel according to the manual selection of the driver, namely, the vehicle-mounted system is completely manually controlled by the driver under the condition that the intelligent defrosting mode and the anti-fog reminding mode are closed;
3. judging the current speed of a vehicle under the intelligent demisting mode
-if the vehicle speed is greater than or equal to the threshold V, skipping to 4, continuing the decision;
if the vehicle speed is less than the threshold value V, then opening external ventilation at this point may lead to harmful vehicle exhaust gases, thus jumping to 3.1;
3.1 vehicle-mounted System of Motor vehicle to remind driver that there is a risk of fogging of the current windscreen, consisting of
The driver carries out manual control according to the actual situation;
4. the vehicle-mounted system of the motor vehicle looks up a table according to two parameters of the vehicle speed and the ambient temperature, combines to obtain reasonable control parameters according to different working conditions, and switches to internal ventilation when the output of the corresponding relation table is 0; harmful automobile exhaust is prevented from flowing into the automobile; when the output of the corresponding relation table is 1, switching to external ventilation, and introducing fresh air into the vehicle to reduce the humidity of the air in the vehicle; that is to say:
when the table lookup output is 1, skipping to 4.1;
when the table lookup output is 0, jump to 4.2.
4.1 automatically switching the vehicle-mounted air conditioner into external ventilation, and opening an air duct in a windshield area to reduce the air humidity of the area;
4.2 automatically switching the vehicle-mounted air conditioner into automatic switching for internal ventilation, preventing harmful gas from flowing into the vehicle, simultaneously opening an air duct in a windshield area, and reducing the air humidity in the area by using circulation in the vehicle;
5. judging whether the condition for starting the air conditioner is true, wherein the judgment of the condition for starting the air conditioner comprises judging whether the ambient temperature is high enough, the air conditioning system has no fault and the like, and judging whether the ambient humidity outside the vehicle is greater than a set value H3 (for judging whether the vehicle is rainy);
-if the air conditioner turn-on condition is true and the ambient humidity is greater than the set value H3, then jump to 5.1, turning on the air conditioner to prevent fogging of the windshield;
if the air conditioner cannot be started or the ambient humidity is less than the set value H3, jumping to 5.2 and keeping the current air conditioner control state unchanged;
5.1 in rainy days, when the external ventilation is started, the front windshield glass can also be fogged, because the humidity of the outside air entering the vehicle is very high, the external ventilation can also be fogged when the external ventilation is started, and the fogging problem can be effectively solved by starting the air conditioner and opening the air duct in the windshield area in the internal ventilation mode;
5.2 if the starting condition of the air conditioner is not true, the air conditioner cannot be started; if the air conditioner on condition is true, but the ambient humidity is less than H3, then the air conditioner need not be turned on to defog.
It is contemplated that defogging is stopped after a certain duration of defogging, such as after ten or fifteen minutes; or stop defogging upon detection of an air humidity in the windshield area below another predetermined threshold.
The correspondence between the ambient temperature, the vehicle speed, and the air passage control parameter is described below with reference to fig. 3 by way of an exemplary graph. As can be seen from the correspondence table in fig. 3:
when the ambient temperature is lower than 0 ℃ and the vehicle speed is more than 40km/h, the output is 1, and the external ventilation is started; when the vehicle speed is less than 30km/h, the output is 0, and the internal ventilation is switched;
when the ambient temperature is 10 ℃ and the vehicle speed is more than 30km/h, the output is 1, and the external ventilation is started; when the vehicle speed is less than 20km/h, the output is 0, and the internal ventilation is switched;
when the ambient temperature is higher than 20 ℃ and the vehicle speed is more than 20km/h, the output is 1, and the external ventilation is started; when the vehicle speed is less than 10km/h, the output is 0, and the internal ventilation is switched.
The design mode of table output also realizes that a difference value exists when the internal and external ventilation control is switched, according to the example shown in figure 3, the difference value is 10km/h, and the jump of the output of the ventilation control caused by the vertical jump of the vehicle speed at a certain point is prevented. The specific calibration can be freely combined according to different control concepts.
It is clear that the table shown in fig. 3 only gives a possible embodiment and that the specific values can be calibrated experimentally or empirically in combination with the climate conditions of the local area. Instead of a map, the output may also be configured as a function of the input ambient temperature and vehicle speed, whereby the air duct control parameters may be derived by a corresponding algorithm.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
It is to be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the design of the present invention, but the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A method implementation for operating an on-board air conditioning system of a motor vehicle, the method comprising the steps of:
1) acquiring the ambient temperature around the motor vehicle;
2) acquiring the current speed of the motor vehicle;
3) determining air duct control parameters according to the acquired environmental temperature and the acquired vehicle speed;
4) switching the vehicle-mounted air conditioner into an internal ventilation mode or an external ventilation mode according to the determined air duct control parameters;
5) opening an air duct in the windshield area for defogging;
wherein steps 1) and 2) may be performed in parallel or in reverse order.
2. The method according to claim 1, wherein the air passage control parameter is determined from the acquired ambient temperature and vehicle speed by a correspondence table or a characteristic curve stored in advance, or determined from the ambient temperature and vehicle speed by an algorithm.
3. A method according to claim 1 or 2, wherein the air humidity of the windscreen area is also captured, and the defogging is automatically performed or the driver is alerted to perform the defogging only when the air humidity is above a predetermined threshold.
4. The method as claimed in claim 1 or 2, wherein the in-vehicle air conditioning system is set to an intelligent defogging mode, an anti-fog reminding mode and a manual mode according to the user's setting.
5. The method of claim 4, wherein in the anti-fog alert mode, if the air humidity in the windshield area is detected to be above a certain threshold, then the driver is alerted that the windshield is at risk of fogging and a defogging operation is advised.
6. The method of claim 5, wherein the driver is alerted to defog visually and/or audibly.
7. The method of claim 1 or 2, wherein an air conditioner turn-on condition is additionally judged, and if the judgment result is 'true', the air conditioner is automatically turned on; and if the judgment result is 'false', keeping the current air conditioner setting unchanged, wherein the judgment of the air conditioner starting condition comprises comprehensive evaluation of the environment temperature, the function of the air conditioner system is intact and the environment humidity.
8. A method according to claim 1 or 2, wherein demisting is stopped after a certain duration of demisting or upon detecting that the air humidity in the windscreen area is below a further predetermined threshold value.
9. The utility model provides a defogging system, this defogging system is used for carrying out the defogging for the windscreen of motor vehicle, and this defogging system includes ambient temperature sensor, speed sensor and system controller and storage module, wherein, system controller and ambient temperature sensor and speed sensor signal connection, wherein, prestore has corresponding relation table and characteristic curve that describes the corresponding relation between ambient temperature, speed of a motor vehicle and the air duct control parameter in storage module, and this system controller sets up to, can confirm the air duct control parameter and drive the control with corresponding air duct control parameter to the air duct according to ambient temperature and the speed of a motor vehicle that ambient temperature sensor and speed sensor provided in order to carry out the defogging to the windscreen.
10. A defogging system as recited in claim 9 wherein said storage module is integrated into a system controller.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011403826.4A CN114590228A (en) | 2020-12-04 | 2020-12-04 | Method for operating a vehicle-mounted air conditioning system of a motor vehicle and defogging system |
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| CN202011403826.4A CN114590228A (en) | 2020-12-04 | 2020-12-04 | Method for operating a vehicle-mounted air conditioning system of a motor vehicle and defogging system |
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