Method, device and computer-readable storage medium for obtaining air humidity in a vehicle

Abstract

The embodiments of the present disclosure provide a method, device and computer-readable storage medium for obtaining the air humidity in a vehicle. The method comprises: obtaining a first vehicle-external parameter provided by an engine control module; obtaining a vehicle state parameter provided by a vehicle body control module; obtaining an ambient temperature provided by an instrument control module and an internal parameter of an in-vehicle air conditioning controller; and obtaining the air humidity in the vehicle according to the first vehicle-external parameter, the vehicle state parameter, the ambient temperature and the internal parameter. In this way, the air humidity in the vehicle can be calculated in real time by integrating multiple parameters, thereby avoiding the need to use a humidity sensor to monitor the humidity in the vehicle and increasing the cost of the whole vehicle. This also simplifies the structure of the rearview mirror, avoids the influence of the heat source in the rearview mirror and reduces the accuracy of the air humidity in the vehicle, and improves the measurement accuracy of the air humidity in the vehicle.

Description

Technical Field

[0001] The present disclosure relates to the automotive field, and in particular to the humidity acquisition technology field. Background Art

[0002] In recent years, more and more car models are equipped with automatic air conditioning. In addition to ensuring thermal comfort in the car, for the sake of driving safety, the visibility of the windshield has received more and more attention. Therefore, many car models are equipped with in-car humidity sensors to monitor the humidity in the car. In this way, when the humidity near the windshield is detected to increase, the automatic air conditioner with automatic defog function will switch to defog or defrost mode to prevent the windshield from fogging.

[0003] However, by configuring an in-car humidity sensor to monitor the humidity in the car, the cost of the entire vehicle is increased. Secondly, the humidity sensor is generally arranged in the rearview mirror cover. Therefore, the measured humidity may not be very accurate and cannot well represent the humidity near the entire front windshield. In addition, the measured humidity is easily affected by other heat sources near the humidity sensor in the shell, resulting in inaccurate humidity measurement. Summary of the invention

[0004] The present disclosure provides a method, device, equipment and storage medium for obtaining air humidity in a vehicle.

[0005] According to a first aspect of the present disclosure, a method for obtaining air humidity in a vehicle is provided. The method comprises:

[0006] Acquire a first external vehicle parameter provided by an engine control module;

[0007] Get the vehicle status parameters provided by the body control module;

[0008] Obtain the ambient temperature provided by the instrument control module and the internal parameters of the vehicle air conditioning controller;

[0009] The air humidity inside the vehicle is obtained according to the first external vehicle parameter, the vehicle state parameter, the ambient temperature and the internal parameter.

[0010] According to the above aspects and any possible implementation manner, there is further provided an implementation manner, wherein the first external vehicle parameter includes: external vehicle specific humidity and ambient atmospheric pressure;

[0011] The vehicle state parameters include: seat occupancy state, window position state and vehicle speed;

[0012] The internal parameters include: the air temperature at the outlet of the evaporator in the air conditioning box, the temperature inside the vehicle, the blower parameters in the air conditioning box, and the position of the air conditioner internal and external circulation damper.

[0013] According to the above aspects and any possible implementation manner, an implementation manner is further provided, wherein obtaining the air humidity inside the vehicle according to the first external vehicle parameter, the vehicle state parameter, the ambient temperature parameter and the internal parameter comprises:

[0014] Calculating the mass of water vapor generated by passengers in the vehicle according to the seat sitting state;

[0015] Calculating the water vapor mass and dry air mass of the air entering the vehicle through the window according to the window position state and the vehicle speed;

[0016] Calculate the water vapor mass and dry air mass of the air entering the vehicle from the air conditioning box according to the blower parameters, the position of the air conditioner internal and external circulation damper, the vehicle speed, the vehicle interior temperature, the ambient temperature, the vehicle exterior specific humidity, the vehicle interior specific humidity, the ambient atmospheric pressure, and the evaporator outlet air temperature, wherein the initial value of the vehicle interior specific humidity is the vehicle exterior specific humidity at the initial moment;

[0017] The air humidity in the vehicle is obtained according to the water vapor mass generated by the passengers in the vehicle, the water vapor mass and dry air mass of the air entering the vehicle through the vehicle windows, and the water vapor mass and dry air mass of the air entering the vehicle from the air conditioning box.

[0018] According to the above aspects and any possible implementation manner, an implementation manner is further provided, wherein the calculating the mass of water vapor generated by passengers in the vehicle according to the seat sitting state comprises:

[0019] Determine whether there are passengers in the car seats;

[0020] Determine the weight of each passenger;

[0021] Calculate the mass of water vapor generated by the passengers in the car based on the sum of the passenger weights.

[0022] According to the above aspects and any possible implementation manner, an implementation manner is further provided, wherein the water vapor mass and dry air mass of the air entering the vehicle through the vehicle window according to the vehicle window position state and the vehicle speed comprises:

[0023] Calculating the window opening area according to the window position state;

[0024] Calculating the volume of air entering the vehicle through the window according to the window opening area and the vehicle speed;

[0025] The water vapor mass and dry air mass of the air entering the vehicle through the vehicle window are calculated according to the in-vehicle specific humidity, the ambient atmospheric pressure, the ambient temperature, and the volume of the air.

[0026] According to the above aspects and any possible implementation manner, an implementation manner is further provided, wherein the water vapor mass and dry air mass of the air entering the vehicle from the air conditioning box are calculated according to the blower parameters, the position of the air conditioner internal and external circulation damper, the vehicle speed, the vehicle interior temperature, the ambient temperature, the vehicle exterior specific humidity, the vehicle interior specific humidity, the ambient atmospheric pressure, and the evaporator outlet air temperature, including:

[0027] Calculating the volume of air entering the blower according to the blower parameters, the position of the air conditioner internal and external circulation damper, and the vehicle speed;

[0028] Calculating the water vapor mass and dry air mass of the air entering the blower according to the vehicle interior temperature, the ambient temperature, the vehicle exterior specific humidity, the vehicle interior specific humidity, the ambient atmospheric pressure, and the volume of the air entering the blower;

[0029] The water vapor mass and dry air mass of the air entering the blower and the evaporator outlet air temperature are calculated based on the water vapor mass and dry air mass of the air entering the vehicle through the evaporator after the air flowing out of the blower enters the evaporator.

[0030] According to the above aspects and any possible implementation manner, an implementation manner is further provided, wherein the water vapor mass and dry air mass of the air entering the blower and the evaporator outlet air temperature are calculated after the air flowing out of the blower enters the evaporator and then passes through the evaporator and enters the vehicle interior, including:

[0031] Calculating the moisture content of the air entering the blower according to the water vapor mass and the dry air mass of the air entering the blower;

[0032] Calculating the water vapor partial pressure of the air entering the blower based on the moisture content of the air and the ambient atmospheric pressure;

[0033] Calculating the corresponding water vapor saturation pressure according to the evaporator outlet air temperature;

[0034] If the water vapor partial pressure is less than or equal to the water vapor saturation pressure, the water vapor mass of the air entering the vehicle through the evaporator is the water vapor mass of the air entering the blower;

[0035] If the water vapor partial pressure is greater than the water vapor saturation pressure, the water vapor mass of the air entering the vehicle through the evaporator is calculated based on the dry air mass of the air entering the blower and the water vapor saturation pressure, wherein the dry air mass of the air entering the vehicle through the evaporator is equal to the dry air mass of the air entering the blower.

[0036] According to the above aspects and any possible implementation manner, an implementation manner is further provided, wherein the obtaining of the air humidity in the vehicle according to the water vapor mass generated by the passengers in the vehicle, the water vapor mass and dry air mass of the air entering the vehicle through the vehicle windows, and the water vapor mass and dry air mass of the air entering the vehicle from the air conditioning box comprises:

[0037] The sum of the water vapor mass generated by the passengers in the vehicle, the water vapor mass of the air entering the vehicle through the vehicle windows, and the water vapor mass of the air entering the vehicle from the air conditioning box is taken as the water vapor mass increased in the vehicle at the current moment;

[0038] Calculate the mass of water vapor discharged from the vehicle to the outside at the current moment according to the dry air mass of the air entering the vehicle through the vehicle window and the dry air mass of the air entering the vehicle from the air conditioning box;

[0039] Calculate the water vapor mass inside the car at the next moment according to the existing water vapor mass inside the car at the current moment, the water vapor mass added inside the car at the current moment, and the water vapor mass discharged from the car to the outside at the current moment;

[0040] Calculating the dry air mass in the vehicle at the next moment according to the water vapor mass at the next moment;

[0041] The in-vehicle specific humidity is updated according to the water vapor mass in the vehicle at the next moment and the dry air mass in the vehicle at the next moment to serve as the in-vehicle specific humidity at the next moment.

[0042] According to a second aspect of the present disclosure, a device for obtaining air humidity in a vehicle is provided. The device comprises:

[0043] A first acquisition module, used for acquiring a first external vehicle parameter provided by an engine control module;

[0044] A second acquisition module is used to acquire the vehicle state parameters provided by the body control module;

[0045] A third acquisition module is used to obtain the ambient temperature provided by the instrument control module and the internal parameters of the in-vehicle air conditioning controller;

[0046] The fourth acquisition module is used to acquire the air humidity inside the vehicle according to the first external vehicle parameter, the vehicle state parameter, the ambient temperature and the internal parameter.

[0047] According to a third aspect of the present disclosure, an electronic device is provided, which includes a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the program, the method described above is implemented.

[0048] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the program is executed by a processor, the method according to the first aspect and / or the second aspect of the present disclosure is implemented.

[0049] In the present disclosure, by acquiring the first external vehicle parameter, vehicle status parameter, ambient temperature and internal parameter provided by different modules, the air humidity inside the vehicle can be calculated in real time by integrating multiple parameters, thereby avoiding the need to use a humidity sensor to monitor the humidity inside the vehicle and increasing the cost of the entire vehicle. This also simplifies the structure of the rearview mirror, avoids the accuracy of the air humidity inside the vehicle being reduced due to the influence of the heat source inside the rearview mirror, and improves the measurement accuracy of the air humidity inside the vehicle.

[0050] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, among which:

[0052] Figure 1 A flow chart of a method for obtaining air humidity in a vehicle according to an embodiment of the present disclosure is shown;

[0053] Figure 2 shows an air flow and water vapor generation diagram according to an embodiment of the present disclosure;

[0054] Figure 3 A block diagram of an exemplary electronic device capable of implementing embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0056] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0057] Figure 1 A flow chart of a method 100 for obtaining in-vehicle air humidity according to an embodiment of the present disclosure is shown. The method 100 may include:

[0058] Step 110, obtaining a first external vehicle parameter provided by an engine control module (ECM).

[0059] Step 120, obtaining vehicle status parameters provided by a body control module; the body control module is BCM (body control module).

[0060] Step 130, obtaining the ambient temperature and internal parameters of the in-vehicle air conditioning controller provided by the instrument control module; the instrument control module is used to provide instruments for various parameters such as temperature.

[0061] Step 140: Obtain the air humidity inside the vehicle according to the first vehicle external parameter, the vehicle state parameter, the ambient temperature and the internal parameter. The air humidity inside the vehicle is the relative humidity inside the vehicle.

[0062] By obtaining the first external parameters, vehicle status parameters, ambient temperature and internal parameters provided by different modules, the air humidity inside the vehicle can be calculated in real time based on a combination of multiple parameters, thereby avoiding the need to use humidity sensors to monitor the humidity inside the vehicle and increasing the cost of the entire vehicle. This also simplifies the structure of the rearview mirror, avoids the influence of heat sources inside the rearview mirror and reduces the accuracy of the air humidity inside the vehicle, and improves the measurement accuracy of the air humidity inside the vehicle.

[0063] In some embodiments, the first external vehicle parameter includes: external vehicle specific humidity and ambient atmospheric pressure;

[0064] The vehicle state parameters include: seat occupancy state, window position state and vehicle speed;

[0065] The internal parameters include: the air temperature at the outlet of the evaporator in the air conditioning box, the temperature inside the vehicle, the blower parameters in the air conditioning box, and the position of the air conditioner internal and external circulation damper.

[0066] By comprehensively considering the external relative humidity, ambient atmospheric pressure, ambient temperature, evaporator outlet air temperature, in-vehicle temperature, current air volume of the air-conditioning blower, air-conditioning internal and external circulation positions, seat occupancy status, window position status, and vehicle speed, the air-conditioning controller can accurately calculate the in-vehicle air humidity in real time, thereby accurately obtaining the in-vehicle air humidity through virtual calculation, thereby reducing the overall vehicle cost and improving the accuracy of the in-vehicle air humidity.

[0067] In some embodiments, obtaining the air humidity inside the vehicle according to the first external vehicle parameter, the vehicle state parameter, the ambient temperature parameter and the internal parameter includes:

[0068] Calculating the mass of water vapor generated by passengers in the vehicle according to the seat sitting state;

[0069] The seat occupancy status is used to indicate whether the seat is occupied and the weight of the passenger on the occupied seat.

[0070] Calculating the water vapor mass and dry air mass of the air entering the vehicle through the window according to the window position state and the vehicle speed;

[0071] The window position status is used to indicate whether the window is open and the specific opening degree.

[0072] Calculate the water vapor mass and dry air mass of the air entering the vehicle from the air conditioning box according to the blower parameters, the position of the air conditioner internal and external circulation damper, the vehicle speed, the vehicle interior temperature, the ambient temperature, the vehicle exterior specific humidity, the vehicle interior specific humidity, the ambient atmospheric pressure, and the evaporator outlet air temperature, wherein the initial value of the vehicle interior specific humidity is the vehicle exterior specific humidity at the initial moment;

[0073] The air humidity in the vehicle is obtained according to the water vapor mass generated by the passengers in the vehicle, the water vapor mass and dry air mass of the air entering the vehicle through the vehicle windows, and the water vapor mass and dry air mass of the air entering the vehicle from the air conditioning box.

[0074] The mass of water vapor generated by passengers in the car can be accurately calculated through the seat sitting state, and the mass of water vapor and dry air of the air entering the car through the windows can be accurately calculated through the window position state and the vehicle speed. Similarly, based on the blower parameters, the position of the air-conditioning internal and external circulation damper, the vehicle speed, the temperature inside the car, the ambient temperature, the outside specific humidity, the inside specific humidity, the ambient atmospheric pressure and the evaporator outlet air temperature, the mass of water vapor and dry air of the air entering the car from the air-conditioning box can be accurately calculated. The sources of the increased water vapor mass in the car are the windows, passengers and the air-conditioning box. Therefore, based on the mass of water vapor generated by passengers in the car, the mass of water vapor and dry air of the air entering the car through the windows, and the mass of water vapor and dry air of the air entering the car from the air-conditioning box, the increased water vapor content in the car at the current moment can be accurately calculated. In this way, the current air humidity in the car can be accurately calculated without using a humidity and temperature sensor.

[0075] In some embodiments, the calculating the mass of water vapor generated by passengers in the vehicle according to the seat sitting state includes:

[0076] Determine whether there are passengers in the car seats;

[0077] Determine the weight of each passenger;

[0078] Calculate the mass of water vapor generated by the passengers in the car based on the sum of the passenger weights.

[0079] Each seat in the car is equipped with a sensor to sense whether there is a passenger sitting on the seat and measure the weight of the passenger. This information is then input into the humidity calculation model. According to the weight of each passenger in the car, the volume of each passenger in the car and the mass flow rate of water vapor exhaled per second can be obtained by looking up the table. Combined with time, the total volume of the passengers in the car and the total mass flow rate of water vapor exhaled can be accurately calculated.

[0080] In some embodiments, the calculating, according to the window position state and the vehicle speed, the water vapor mass and the dry air mass of the air entering the vehicle through the window comprises:

[0081] Calculating the window opening area according to the window position state;

[0082] Calculating the volume of air entering the vehicle through the window according to the window opening area and the vehicle speed;

[0083] The water vapor mass and dry air mass of the air entering the vehicle through the vehicle window are calculated according to the in-vehicle specific humidity, the ambient atmospheric pressure, the ambient temperature, and the volume of the air.

[0084] When the car window is opened, the airflow from the outside environment enters the car through the open window. The four car windows on the car give the opening state of the window according to the motor position, and then the window opening area is calculated according to the area and opening state of the window. In this way, the air conditioning volume flow V entering the car from the open window can be accurately calculated by the vehicle speed and the window opening area. window .

[0085]

[0086] Where A w is the area of ​​the open window, v spd is the vehicle speed, K window K is the flow correction coefficient related to the airflow direction (wind direction) and the flow surface (window opening part), spd It is the correction coefficient of air flow when the vehicle speed is 0.

[0087] Then according to the air conditioning volume flow V window As well as the dry air mass calculation formula and the water vapor mass calculation formula, the dry air mass flow rate and water vapor mass flow rate entering the car from the open part of the window can be accurately calculated.

[0088] In some embodiments, the water vapor mass and dry air mass of the air entering the vehicle from the air conditioning box are calculated based on the blower parameters, the position of the air conditioner internal and external circulation damper, the vehicle speed, the vehicle interior temperature, the ambient temperature, the vehicle exterior specific humidity, the vehicle interior specific humidity, the ambient atmospheric pressure, and the evaporator outlet air temperature, including:

[0089] Calculating the volume of air entering the blower according to the blower parameters, the position of the air conditioner internal and external circulation damper, and the vehicle speed;

[0090] When the air conditioning blower is working, the air volume flow rate passing through the air conditioning blower is obtained according to the blower control signal, specifically:

[0091] According to Figure 2 The position of the internal and external circulation damper (damper 4) shown in the figure can be used to determine the ratio of the air volume flow rate entering the air conditioning box from outside the vehicle (arrow 1, external circulation) and from inside the vehicle (arrow 2, internal circulation) by looking up the table. Then, according to the air volume flow rate ratio and the air intake volume corresponding to the gear position of the blower, the volume of air entering the blower using the internal circulation and the external circulation can be determined respectively.

[0092] When the air conditioning blower is not working, air outside the car will also enter the car through the air conditioning box. Its air volume flow rate is obtained by looking up the table according to the vehicle speed and then multiplied by a correction coefficient. The correction coefficient is obtained by looking up the table according to the position of the air conditioning internal and external circulation dampers. At this time, the air volume of the internal circulation is 0.

[0093] Calculating the water vapor mass and dry air mass of the air entering the blower according to the vehicle interior temperature, the ambient temperature, the vehicle exterior specific humidity, the vehicle interior specific humidity, the ambient atmospheric pressure, and the volume of the air entering the blower;

[0094] The water vapor mass and dry air mass of the air entering the blower and the evaporator outlet air temperature are calculated based on the water vapor mass and dry air mass of the air flowing out of the blower into the evaporator and then passing through the evaporator and entering the vehicle.

[0095] According to the air temperature inside and outside the vehicle, the relative humidity inside and outside the vehicle, the ambient atmospheric pressure, and the volume of air entering the blower for internal and external circulation, the dry air mass calculation formula and the water vapor mass calculation formula can be used to accurately calculate the dry air mass flow rate and the water vapor mass flow rate of the air entering the blower for external circulation and internal circulation, respectively. The air entering the blower 5 may be partially evaporated after passing through the evaporator 6. Therefore, according to the water vapor mass and dry air mass of the air entering the blower and the evaporator outlet air temperature, the water vapor mass and dry air mass of the air entering the vehicle through the evaporator can be accurately calculated.

[0096] In some embodiments, the calculating, based on the water vapor mass and dry air mass of the air entering the blower and the evaporator outlet air temperature, the water vapor mass and dry air mass of the air entering the vehicle through the evaporator after the air flowing out of the blower enters the evaporator, comprises:

[0097] Calculating the moisture content of the air entering the blower according to the water vapor mass and the dry air mass of the air entering the blower;

[0098] Calculating the water vapor partial pressure of the air entering the blower based on the moisture content of the air and the ambient atmospheric pressure;

[0099] Moisture content of air:

[0100] Water vapor partial pressure:

[0101] Where m v is the water vapor mass of the air entering the blower, n a is the dry air mass of the air entering the blower, P b is the ambient atmospheric pressure.

[0102] Calculating the corresponding water vapor saturation pressure according to the evaporator outlet air temperature;

[0103] If the water vapor partial pressure is less than or equal to the water vapor saturation pressure, the water vapor mass of the air entering the vehicle through the evaporator is the water vapor mass of the air entering the blower;

[0104] If the water vapor partial pressure is greater than the water vapor saturation pressure, the water vapor mass of the air entering the vehicle through the evaporator is calculated based on the dry air mass of the air entering the blower and the water vapor saturation pressure, wherein the dry air mass of the air entering the vehicle through the evaporator is equal to the dry air mass of the air entering the blower.

[0105] If the water vapor partial pressure is less than or equal to the water vapor saturation pressure, it means that the water vapor content in the air entering the blower is relatively low, so the water vapor will basically not be evaporated after passing through the evaporator. Therefore, if the water vapor partial pressure is less than or equal to the water vapor saturation pressure, the water vapor mass of the air entering the vehicle through the evaporator is directly the water vapor mass of the air entering the blower; if the water vapor partial pressure is greater than the water vapor saturation pressure, it means that the water vapor content in the air entering the blower is relatively large, so part of the water vapor flowing out of the blower and entering the evaporator will be evaporated. Therefore, the water vapor mass m of the air entering the vehicle through the evaporator can be recalculated based on the dry air mass of the air entering the blower and the water vapor saturation pressure. v ,

[0106] m a is the dry air mass of the air entering the vehicle through the evaporator, P s,evap is the water vapor saturation pressure.

[0107] In some embodiments, obtaining the air humidity in the vehicle according to the water vapor mass generated by the passengers in the vehicle, the water vapor mass and dry air mass of the air entering the vehicle through the vehicle windows, and the water vapor mass and dry air mass of the air entering the vehicle from the air conditioning box includes:

[0108] The sum of the water vapor mass generated by the passengers in the vehicle, the water vapor mass of the air entering the vehicle through the vehicle windows, and the water vapor mass of the air entering the vehicle from the air conditioning box is taken as the water vapor mass increased in the vehicle at the current moment;

[0109] Calculate the mass of water vapor discharged from the vehicle to the outside at the current moment according to the dry air mass of the air entering the vehicle through the vehicle window and the dry air mass of the air entering the vehicle from the air conditioning box;

[0110] Calculate the water vapor mass inside the car at the next moment according to the existing water vapor mass inside the car at the current moment, the water vapor mass added inside the car at the current moment, and the water vapor mass discharged from the car to the outside at the current moment;

[0111] Among them, the water vapor mass inside the vehicle at the initial moment is equal to the water vapor mass outside the vehicle at the initial moment, and the water vapor mass outside the vehicle at the initial moment is calculated based on the dry air mass outside the vehicle at the initial moment and the initial specific humidity inside the vehicle. The dry air mass outside the vehicle at the initial moment can be calculated based on the air volume inside the vehicle, the initial specific humidity inside the vehicle, the temperature outside the vehicle and the ambient atmospheric pressure. The initial specific humidity inside the vehicle is equal to the specific humidity outside the vehicle at the initial moment.

[0112] Calculating the dry air mass in the vehicle at the next moment according to the water vapor mass at the next moment;

[0113] The in-vehicle specific humidity is updated according to the water vapor mass in the vehicle at the next moment and the dry air mass in the vehicle at the next moment to serve as the in-vehicle specific humidity at the next moment.

[0114] Since the volume of the vehicle is fixed, the mass of dry air that can be stored in the vehicle is constant. In this way, the dry air mass of the air entering the vehicle at each moment is equal to the dry air mass of the air discharged from the vehicle to the outside. The dry air mass is closely related to the water vapor mass. Therefore, the sum of the dry air mass of the air entering the vehicle through the car window and the dry air mass of the air entering the vehicle from the air-conditioning box is used as the dry air mass of the air discharged outside the vehicle. The dry air mass discharged from the vehicle to the outside and the relationship between the dry air mass and the water vapor mass can be used to calculate the water vapor mass discharged from the vehicle to the outside at the current moment. The mass of water vapor in the car, the mass of water vapor added in the car at the current moment, and the mass of water vapor discharged from the car to the outside of the car at the current moment can be used to accurately calculate the mass of water vapor in the car at the next moment; then the dry air mass in the car at the next moment is recalculated by still using the relationship between the dry air mass and the water vapor mass, so as to timely update the specific humidity in the car according to the water vapor mass in the car at the next moment and the dry air mass in the car at the next moment, so as to serve as the specific humidity in the car at the next moment, so that the specific humidity in the car is iteratively updated, and then the partial pressure formula of water vapor in the air and the saturated pressure formula of water vapor in the air can be used to accurately calculate the relative humidity in the car through iteration.

[0115] The following will be combined Figure 2 The technical solution of the present disclosure is further described in detail:

[0116] like Figure 2As shown, arrow 1 is the airflow entering the air conditioning box from outside the vehicle, arrow 2 is the airflow entering the air conditioning box from the inside of the car 8, and the ratio of the two airflows is determined by the internal and external circulation damper 4. Arrow 3 is the airflow after the two airflows from outside the vehicle and from inside the car enter the air conditioning box. Circle 5 is the air conditioning blower. If the air conditioning compressor is working, after the airflow passes through the evaporator 6 in the air conditioning box, part of the water vapor will be discharged. Arrow 7 is the airflow entering the car 8 after passing through the evaporator. The grids 9, 10, 11, and 12 are vehicle windows. Arrows 18, 19, 20, and 21 are the airflows entering the car through the windows when the windows are open. Chair patterns 13, 14, 15, 16, and 17 are seats in the car equipped with sensors for detecting the weight of passengers above the seats. Arrows 22, 23, 24, 25, and 26 are the water vapor exhaled by people in the car. Arrow 27 is the sum of the airflows flowing out of the car.

[0117] Based on input signals such as the air conditioning inlet specific humidity, air conditioning inlet temperature, ambient atmospheric pressure, vehicle interior temperature, evaporator surface temperature, blower air volume flow, number of people in the vehicle, and window status, the mass of water vapor entering the vehicle and the mass of water vapor discharged outside the vehicle are calculated, thereby calculating the relative humidity inside the vehicle in real time.

[0118] The calculation process of relative humidity is further explained in detail below:

[0119] During initialization, it is assumed that the humidity inside and outside the vehicle is the same, and the specific humidity of the air inside the vehicle is equal to the specific humidity outside the vehicle (engine intake specific humidity). b The relative humidity RH of the air outside the car can be calculated by the temperature T inside and outside the car, and the water vapor mass M inside the car can be determined at the same time. v .

[0120] Partial pressure of water vapor in air:

[0121] The saturation pressure of water vapor in the air is:

[0122] Relative humidity of air:

[0123] Dry air quality in air:

[0124] Water vapor mass in air:

[0125] Where V is the volume of the air inside the vehicle, which is the volume of the vehicle minus the volume of the people inside the vehicle. The formula for calculating the mass of dry air can also be used to calculate the mass flow rate of flowing air. When calculating the mass flow rate of dry air, V is the volume flow rate of air.

[0126] Step 2: Water vapor generated by people in the car

[0127] Each seat in the car is equipped with a sensor to sense whether there is a passenger sitting on the seat and measure the weight of the passenger. The information is input into the humidity calculation model. According to the weight of each passenger in the car, the volume of each passenger in the car and the mass flow rate of water vapor exhaled per second can be obtained by looking up the table, thereby calculating the total volume of passengers in the car and the total mass flow rate of water vapor exhaled per second. v,man .

[0128] Step 3: Water vapor mass flow rate from the air conditioning box into the car

[0129] When the air conditioning blower is working, the air volume flow rate (arrow 3) passing through the air conditioning blower is obtained according to the blower control signal. According to the position of the internal and external circulation damper (damper 4), the ratio of the air volume flow rate entering the air conditioning box from outside the vehicle (arrow 1, external circulation) and from inside the vehicle (arrow 2, internal circulation) can be determined by looking up the table.

[0130] When the air conditioning blower is not working, air outside the car will also enter the car through the air conditioning box. Its air volume flow rate is obtained by looking up the table according to the vehicle speed and then multiplied by a correction coefficient. The correction coefficient is obtained by looking up the table according to the position of the air conditioning internal and external circulation dampers. At this time, the air volume of the internal circulation is 0.

[0131] According to the air temperature inside and outside the vehicle, the relative humidity inside and outside the vehicle, the atmospheric pressure, and the volume flow rate of the air entering the internal and external circulation, the formula in step 1 can be used to calculate the dry air mass flow rate and the water vapor mass flow rate entering the external circulation and the internal circulation respectively; the dry air mass flow rate of the air flow entering the blower (arrow 3) is the sum of the dry air mass flow rate entering the external circulation (arrow 1) and the dry air mass flow rate entering the internal circulation (arrow 2), and the water vapor mass flow rate of the air flow entering the blower (arrow 3) is the sum of the water vapor mass flow rate entering the external circulation (arrow 1) and the water vapor mass flow rate entering the internal circulation (arrow 2). The dry air mass flow rate and water vapor mass flow rate entering the external circulation (arrow 1) are calculated based on the air temperature outside the vehicle, the relative humidity outside the vehicle, the atmospheric pressure, and the volume flow rate of the air entering the external circulation using the formula in step 1; the dry air mass flow rate and water vapor mass flow rate entering the internal circulation (arrow 1) are calculated based on the air temperature inside the vehicle, the relative humidity inside the vehicle, the atmospheric pressure, and the volume flow rate of the air entering the internal circulation using the formula in step 1.

[0132] The water vapor partial pressure of the air flow (arrow 3) entering the blower can be calculated according to the following formula:

[0133] Air humidity:

[0134] Water vapor partial pressure:

[0135] Where m v is the mass flow rate of water vapor, m a is the mass flow rate of dry air, P b is the ambient atmospheric pressure.

[0136] Install a temperature sensor on the surface of the air conditioner evaporator and use the formula in step 1 to calculate the water vapor saturation pressure P at this temperature. s,evap If the water vapor partial pressure of the air flow entering the blower (arrow 3) is less than the water vapor saturation pressure P at the evaporator temperature s,evap , then the water vapor mass flow rate (arrow 7) entering the car after passing through the evaporator is still equal to the water vapor mass flow rate in the airflow (arrow 3) entering the blower. If the water vapor partial pressure of the airflow (arrow 3) entering the blower is greater than or equal to the water vapor saturation pressure P at the evaporator temperature s,evap , then the water vapor mass flow rate (arrow 7) entering the car after passing through the evaporator can be calculated by the dry air mass flow rate in the airflow entering the blower (arrow 3) and the water vapor saturation pressure P at the evaporator temperature. s,evap Calculated.

[0137] The water vapor mass flow rate of the air after passing through the evaporator:

[0138] Where m a is the mass flow rate of dry air. The mass flow rate of dry air remains unchanged after the airflow passes through the evaporator.

[0139] Step 4: Water vapor mass flow rate when the car window is open

[0140] When the car window is open, the airflow from the outside environment enters the car through the open window. The four car windows on the car give the opening state of the window according to the motor position, and the window opening area is calculated according to the window area and the opening state. The air conditioning volume flow V entering the car from the open window can be calculated by the vehicle speed and the window opening area. window .

[0141]

[0142] Where A w is the area of ​​the open window, v spd is the vehicle speed, K window K is the flow correction coefficient caused by airflow direction and flow surface, spd It is the correction coefficient of air flow when the vehicle speed is 0.

[0143] Use the formula in step 1 to calculate the dry air mass flow rate and water vapor mass flow rate entering from the open part of the window (arrows 18, 19, 20, 21).

[0144] Step 5: Changes in the water vapor mass in the car (i.e., the increased water vapor mass flow in the car)

[0145] The increased water vapor mass flow rate in the car is composed of three parts: the water vapor mass flow rate exhaled by the passengers in the car (arrows 22, 23, 24, 25, 26), the water vapor mass flow rate in the air after passing through the evaporator (arrow 7), and the water vapor mass flow rate entering from the open part of the window (arrows 18, 19, 20, 21).

[0146] The airflow entering the car from the open part of the air-conditioning box window is mixed with the air in the car and then discharged to the outside of the car. Since the space in the car is limited, that is, the amount of dry air in the car is fixed, the mass flow rate of dry air discharged from the car to the outside is m a is equal to the sum of the mass flow rates of dry air entering the vehicle (i.e., the sum of the mass flow rates of dry air after passing through the evaporator (arrow 7) and the mass flow rates of dry air entering from the open parts of the windows (arrows 18, 19, 20, 21)),

[0147] Then, according to the current relative humidity inside the car, the mass flow rate of water vapor discharged from the car to the outside can be calculated. v .

[0148]

[0149] The water vapor mass in the car at the next time point is equal to the current water vapor mass in the car plus the increased water vapor mass flow rate in the car minus the water vapor mass flow rate discharged from the car to the outside of the car.

[0150] After obtaining the water vapor mass in the car at the next time node, it is converted into the specific humidity in the car at the next time node. Then, using the partial pressure, saturation pressure and relative humidity calculation formula in step one, the relative humidity in the vehicle (i.e., the air humidity in the vehicle) can be iteratively calculated.

[0151] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should be aware that the present disclosure is not limited by the order of the actions described, because according to the present disclosure, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present disclosure.

[0152] The above is an introduction to the method embodiment. The following is a further explanation of the scheme disclosed in the present invention through an apparatus embodiment.

[0153] The present disclosure also provides a device for obtaining air humidity in a vehicle. The device comprises:

[0154] A first acquisition module, used for acquiring a first external vehicle parameter provided by an engine control module;

[0155] A second acquisition module is used to acquire the vehicle state parameters provided by the body control module;

[0156] A third acquisition module is used to obtain the ambient temperature provided by the instrument control module and the internal parameters of the in-vehicle air conditioning controller;

[0157] The fourth acquisition module is used to acquire the air humidity inside the vehicle according to the first external vehicle parameter, the vehicle state parameter, the ambient temperature and the internal parameter.

[0158] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the described module can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0159] According to an embodiment of the present disclosure, the present disclosure also provides an electronic device and a non-transitory computer-readable storage medium storing computer instructions.

[0160] Figure 3 A schematic block diagram of an electronic device 300 that can be used to implement an embodiment of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present disclosure described and / or required herein.

[0161] The device 300 includes a computing unit 301, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 302 or a computer program loaded from a storage unit 308 into a random access memory (RAM) 303. In the RAM 303, various programs and data required for the operation of the device 300 can also be stored. The computing unit 301, the ROM 302, and the RAM 303 are connected to each other via a bus 304. An input / output (I / O) interface 305 is also connected to the bus 304.

[0162] A number of components in the device 300 are connected to the I / O interface 305, including: an input unit 306, such as a keyboard, a mouse, etc.; an output unit 307, such as various types of displays, speakers, etc.; a storage unit 308, such as a disk, an optical disk, etc.; and a communication unit 309, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 309 allows the device 300 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0163] The computing unit 301 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 301 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 301 performs the various methods and processes described above, such as method 100. For example, in some embodiments, the method 100 may be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit 308. In some embodiments, part or all of the computer program may be loaded and / or installed on the device 300 via the ROM 302 and / or the communication unit 309. When the computer program is loaded into the RAM 303 and executed by the computing unit 301, one or more steps of the method 100 described above may be performed. Alternatively, in other embodiments, the computing unit 301 may be configured to perform the method 100 in any other appropriate manner (e.g., by means of firmware).

[0164] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0165] The program code for implementing the method of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0166] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0167] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0168] The systems and techniques described herein may be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), and the Internet.

[0169] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The relationship of client and server is generated by computer programs running on respective computers and having a client-server relationship with each other. The server may be a cloud server, a server of a distributed system, or a server combined with a blockchain.

[0170] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0171] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A method for obtaining air humidity in a vehicle, It is characterized in that include: Acquire a first external vehicle parameter provided by an engine control module; Get the vehicle status parameters provided by the body control module; Obtain the ambient temperature provided by the instrument control module and the internal parameters of the vehicle air conditioning controller; Acquiring the air humidity inside the vehicle according to the first external vehicle parameter, the vehicle state parameter, the ambient temperature and the internal parameter; The first vehicle external parameter includes: vehicle external specific humidity and ambient atmospheric pressure; The vehicle state parameters include: seat occupancy state, window position state and vehicle speed; The internal parameters include: the air temperature at the outlet of the evaporator in the air conditioning box, the temperature inside the vehicle, the parameters of the blower in the air conditioning box, and the position of the air conditioner internal and external circulation damper; The step of obtaining the air humidity inside the vehicle according to the first external vehicle parameter, the vehicle state parameter, the ambient temperature parameter and the internal parameter includes: Calculating the mass of water vapor generated by passengers in the vehicle according to the seat sitting state; Calculating the water vapor mass and dry air mass of the air entering the vehicle through the window according to the window position state and the vehicle speed; Calculate the water vapor mass and dry air mass of the air entering the vehicle from the air conditioning box according to the blower parameters, the position of the air conditioner internal and external circulation damper, the vehicle speed, the vehicle interior temperature, the ambient temperature, the vehicle exterior specific humidity, the vehicle interior specific humidity, the ambient atmospheric pressure, and the evaporator outlet air temperature, wherein the initial value of the vehicle interior specific humidity is the vehicle exterior specific humidity at the initial moment; The air humidity in the vehicle is obtained according to the water vapor mass generated by the passengers in the vehicle, the water vapor mass and dry air mass of the air entering the vehicle through the vehicle windows, and the water vapor mass and dry air mass of the air entering the vehicle from the air conditioning box.

2. The method according to claim 1, It is characterized in that The calculating the mass of water vapor generated by passengers in the vehicle according to the seat sitting state includes: Determine whether there are passengers in the car seats; Determine the weight of each passenger; Calculate the mass of water vapor generated by the passengers in the car based on the sum of the passenger weights.

3. The method according to claim 1, It is characterized in that The calculating, according to the window position state and the vehicle speed, the water vapor mass and the dry air mass of the air entering the vehicle through the window comprises: Calculating the window opening area according to the window position state; Calculating the volume of air entering the vehicle through the window according to the window opening area and the vehicle speed; The water vapor mass and dry air mass of the air entering the vehicle through the vehicle window are calculated according to the in-vehicle specific humidity, the ambient atmospheric pressure, the ambient temperature, and the volume of the air.

4. The method according to claim 1, It is characterized in that The method of calculating the water vapor mass and dry air mass of the air entering the vehicle from the air conditioning box according to the blower parameters, the position of the air conditioner internal and external circulation damper, the vehicle speed, the vehicle interior temperature, the ambient temperature, the vehicle exterior specific humidity, the vehicle interior specific humidity, the ambient atmospheric pressure, and the evaporator outlet air temperature comprises: Calculating the volume of air entering the blower according to the blower parameters, the position of the air conditioner internal and external circulation damper, and the vehicle speed; Calculating the water vapor mass and dry air mass of the air entering the blower according to the vehicle interior temperature, the ambient temperature, the vehicle exterior specific humidity, the vehicle interior specific humidity, the ambient atmospheric pressure, and the volume of the air entering the blower; The water vapor mass and dry air mass of the air entering the blower and the evaporator outlet air temperature are calculated based on the water vapor mass and dry air mass of the air entering the vehicle through the evaporator after the air flowing out of the blower enters the evaporator.

5. The method according to claim 4, It is characterized in that The step of calculating the water vapor mass and dry air mass of the air flowing out of the blower and entering the evaporator and then passing through the evaporator and entering the vehicle interior according to the water vapor mass and dry air mass of the air entering the blower and the evaporator outlet air temperature comprises: Calculating the moisture content of the air entering the blower according to the water vapor mass and the dry air mass of the air entering the blower; Calculating the water vapor partial pressure of the air entering the blower based on the moisture content of the air and the ambient atmospheric pressure; Calculating the corresponding water vapor saturation pressure according to the evaporator outlet air temperature; If the water vapor partial pressure is less than or equal to the water vapor saturation pressure, the water vapor mass of the air entering the vehicle through the evaporator is the water vapor mass of the air entering the blower; If the water vapor partial pressure is greater than the water vapor saturation pressure, the water vapor mass of the air entering the vehicle through the evaporator is calculated based on the dry air mass of the air entering the blower and the water vapor saturation pressure, wherein the dry air mass of the air entering the vehicle through the evaporator is equal to the dry air mass of the air entering the blower.

6. The method according to any one of claims 1 to 5, It is characterized in that The method of obtaining the air humidity in the vehicle according to the water vapor mass generated by the passengers in the vehicle, the water vapor mass and dry air mass of the air entering the vehicle through the vehicle windows, and the water vapor mass and dry air mass of the air entering the vehicle from the air conditioning box comprises: The sum of the water vapor mass generated by the passengers in the vehicle, the water vapor mass of the air entering the vehicle through the vehicle windows, and the water vapor mass of the air entering the vehicle from the air conditioning box is taken as the water vapor mass increased in the vehicle at the current moment; Calculate the mass of water vapor discharged from the vehicle to the outside at the current moment according to the dry air mass of the air entering the vehicle through the vehicle window and the dry air mass of the air entering the vehicle from the air conditioning box; Calculate the water vapor mass inside the car at the next moment according to the existing water vapor mass inside the car at the current moment, the water vapor mass added inside the car at the current moment, and the water vapor mass discharged from the car to the outside at the current moment; Calculating the dry air mass in the vehicle at the next moment according to the water vapor mass at the next moment; The in-vehicle specific humidity is updated according to the water vapor mass in the vehicle at the next moment and the dry air mass in the vehicle at the next moment to serve as the in-vehicle specific humidity at the next moment.

7. An electronic device, It is characterized in that include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 6.

8. A non-transitory computer-readable storage medium storing computer instructions, It is characterized in that The computer instructions are used to cause the computer to execute the method according to any one of claims 1-6.

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