CN114407605B - Vehicle occupant thermal environment parameter algorithm and vehicle occupant thermal environment monitoring method - Google Patents
Vehicle occupant thermal environment parameter algorithm and vehicle occupant thermal environment monitoring method Download PDFInfo
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- CN114407605B CN114407605B CN202111666888.9A CN202111666888A CN114407605B CN 114407605 B CN114407605 B CN 114407605B CN 202111666888 A CN202111666888 A CN 202111666888A CN 114407605 B CN114407605 B CN 114407605B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
- B60H1/0075—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models the input being solar radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
- B60H1/00807—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models the input being a specific way of measuring or calculating an air or coolant temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/08—Fluids
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention discloses a vehicle passenger thermal environment parameter algorithm, which comprises an automobile air conditioning system, CFD simulation analysis software and an air conditioning dummy test system, wherein the relevant conditions of a blower, solar irradiation and air conditioning air outlet temperature and humidity on an air conditioning dummy are simulated in the CFD simulation analysis software to simulate the vehicle thermal environment of a vehicle passenger in actual conditions, the calculation steps are simple, the operation is efficient, the vehicle passenger thermal environment monitoring method adopting the algorithm utilizes the existing air conditioning air outlet temperature and humidity sensor, a sun-light sensor, an outside-vehicle temperature sensor and an air conditioning return air inlet temperature and humidity sensor, and on the premise of not adding any sensor, the existing data such as vehicle-mounted GPS signals are read, the thermal environment of a human body is calculated by means of the algorithm, the whole passenger and the thermal environment of each part of the human body can be monitored in real time, and the human thermal comfort is used as an object of an intelligent air conditioning control object for the next step, and the basis is laid for improving the comfort of the intelligent air conditioner.
Description
Technical Field
The invention relates to the technical field of automobile air conditioners, in particular to a vehicle occupant thermal environment parameter algorithm and a vehicle occupant thermal environment monitoring method.
Background
Intellectualization is one of the main development trends of the current automobile air conditioning system. By means of the automatic adjustment of the air conditioner temperature air door, the mode air door, the air quantity of the air conditioner blower, the air outlet angle and other mechanisms, the thermal comfort of a human body is improved, meanwhile, manual operation of a driver is reduced, and the occurrence probability of traffic accidents is reduced.
The current automatic air conditioner control takes the target temperature of an air outlet or similar parameters as a control object, the control temperature is manually set by a passenger as input, and the driver still needs to manually operate an air conditioner panel.
In the aspect of monitoring the in-vehicle environment, all the monitoring methods depend on a single in-vehicle temperature sensor, only one point of temperature and humidity value can be obtained, and the complete human body environment including the environmental temperature, humidity, heat radiation amount and wind speed index of each part cannot be monitored in real time.
Under the condition, the difference of the thermal comfortableness of each part of the human body cannot be monitored in real time, corresponding automatic adjustment of the electric air outlet based on the difference cannot be realized, and a driver and an occupant still need to manually define the direction of the air outlet of the air conditioner so as to achieve the optimal air conditioning effect and the lowest air conditioning energy consumption.
Therefore, those skilled in the art are working to develop a vehicle occupant thermal environment parameter algorithm and a vehicle occupant thermal environment monitoring method with high automation degree.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is to provide a vehicle occupant thermal environment parameter algorithm with high automation degree.
In order to achieve the above purpose, the invention provides a vehicle passenger thermal environment parameter algorithm, which comprises an automobile air conditioning system, CFD simulation analysis software and an air conditioning dummy test system, wherein the air conditioning dummy test system comprises an air conditioning dummy, and the automobile air conditioning system comprises a blower, an air conditioning air outlet and an air conditioning air return inlet, and comprises the following steps:
s1, modeling the air conditioner dummy testing system and the automobile air conditioner system in a computer, and modeling a solar light irradiation simulation module;
s2, carrying out partition treatment on the surface of the air-conditioning dummy;
s3, inputting an air blower air quantity and an air outlet mode into the CFD simulation analysis software to obtain the relation between the air speed and the air blower air quantity of each part of the human body surface and the air outlet mode, wherein the relation is expressed by the following formula: f1 (Qblaster, model), wherein Qblaster is air conditioner blower air volume, model is air outlet mode.
S4, inputting sunlight irradiation intensity and sunlight irradiation azimuth into the CFD simulation analysis software to obtain the relationship among the sunlight irradiation intensity, the solar altitude angle, the azimuth angle and the solar irradiation intensity on the surface of the human body, wherein the relationship is represented by the following formula: f2 (Solar, hs, as), wherein Solar is Solar radiation intensity, hs is Solar altitude, and As is Solar azimuth angle with the vehicle front-rear direction being south.
S5, inputting blower air quantity, air conditioner air outlet temperature parameters and air outlet modes into the CFD simulation analysis software to obtain the relation between the air speeds of all parts of the human body surface and the blower air quantity, the air conditioner air outlet temperature, the air conditioner air return inlet temperature and the air outlet modes, wherein the relation is represented by the following formula: f3 And (Toutlet, trecircle, qbler, model), wherein Toutlet is the air outlet temperature, trecircle is the air inlet temperature, qbler is the air volume of an air conditioner blower, and Model is the air outlet mode.
S6, inputting blower air quantity, air conditioner air outlet humidity parameters and air outlet modes into the CFD simulation analysis software to obtain the relation between the air speed of each part of the human body surface and the blower air quantity, the air conditioner air outlet humidity, the air conditioner air return inlet humidity and the air outlet modes, wherein the relation is represented by the following formula: f4 (houtlet, hrecicle, qblower, model), wherein the houtlet is the air outlet humidity, hrecicle is the air inlet humidity, qblower is the air conditioner blower air volume, model is the air outlet mode.
In step S2, the human body surface is divided into a head, a face, a neck, shoulders, upper limbs, a chest, an abdomen, hands, lower limbs, and feet.
In step S3, the air volume of the blower is divided into 100% and 50%, the air outlet mode is divided into four modes of head, body outside and thigh, the CFD simulation analysis software is used for calculating the surface air velocity of each part of the human body in the modes, and the air velocity distribution measured in the CFD simulation analysis software is corrected by using the actual test result of the air conditioning dummy test system.
In step S4, the sunlight irradiation intensity is set to 1000w/m 2 The sunlight irradiation direction is set to be 9 cases in total, namely 90 degrees, 60 degrees before, 60 degrees about, 60 degrees after, 30 degrees before, 30 degrees about and 30 degrees after.
In steps S5 and S6, the blower air volume is divided into two stages of 100% and 50%, and the air outlet mode is divided into four modes of head, body outside and thigh.
The air outlet mode utilizes the CFD simulation analysis software to calculate the flow field of the passenger cabin, and comprises the following steps:
ss1. defining wind speed statistical surfaces corresponding to 4 modes based on R points of the seat arrangement of the automobile, wherein the R points are reference points of the automobile design during the initial whole automobile arrangement of the design;
ss2. changing the air outlet angle of each mode, calculating the flow field of the passenger cabin, and carrying out wind speed statistics on the wind speed statistical surface defined in the step Ss 1;
ss3. if the wind speed of the wind speed statistical surface is not satisfied, the wind outlet angle is further changed, and the step Ss2 is repeated until the wind speed of the wind speed statistical surface satisfies the target;
ss4. record the air outlet angle meeting the air speed target in the step Ss3, and define the air outlet angle as 4 modes of the air outlet.
Comprehensively considering the air conditioner air outlet temperature, the air conditioner return air inlet temperature, the air conditioner air outlet humidity and the air conditioner return air inlet humidity, calculating the environment air temperature of the human body, and further comprising the following steps:
sp1, initializing the thermal environment of a passenger cabin to be 60 ℃ and 30% of humidity;
sp2, calculating the temperature and humidity of hot ambient air in which a human body is positioned and the temperature and humidity of an air conditioner return air inlet in the following 4 processes;
a. ambient temperature 40℃and sunlight intensity 1000w/m 2 The temperature of the air outlet is gradually reduced from 60 ℃ to 0 ℃ at a speed of 2 DEG/min;
b. ambient temperature 40℃and sunlight intensity 500w/m 2 The temperature of the air outlet is gradually reduced from 60 ℃ to 0 ℃ at a speed of 2 DEG/min;
c. ambient temperature 30 ℃, sunlight intensity 0w/m 2 The temperature of the air outlet is gradually reduced from 60 ℃ to 0 ℃ at a speed of 2 DEG/min;
d. ambient temperature 30 ℃, sunlight intensity 0w/m 2 The temperature of the air outlet is gradually reduced from 60 degrees to 0 degree, and the temperature is reducedA speed of 0.5 degrees/min;
sp3, respectively considering two conditions of maximum air quantity and minimum air quantity of the blower;
sp4, counting the relation between the temperature and humidity of the hot ambient air where the human body is located and the temperature and humidity of the air outlet and the air return inlet of the air conditioner.
The invention also provides a vehicle passenger thermal environment monitoring method, which comprises an automobile, and further comprises the vehicle passenger thermal environment parameter algorithm, wherein the vehicle passenger thermal environment parameter algorithm is arranged in a central control computer of the automobile, a GPS positioning device, a sunlight illumination sensor, an outside-automobile temperature sensor, an inside-automobile temperature sensor and an inside-automobile humidity sensor which are electrically connected with the central control computer are further arranged on the automobile, an air conditioner air outlet is provided with an air conditioner air outlet temperature sensor and an air conditioner return air inlet humidity sensor, and the air conditioner return air inlet is provided with an air conditioner return air inlet temperature sensor and an air conditioner return air inlet humidity sensor, and further comprises the following steps:
s7, calculating the wind speed of each part of the surface of the human body
The central control computer reads an air outlet mode signal and an air blower air quantity signal according to the relation between the air speed and the air blower air quantity of each part of the human body surface and the air outlet mode, calculates the air speed of each part of the human body surface, and has a calculation formula of vi=f1 (Qblower, model), wherein Vi is the air speed of each part of the human body surface;
s8, calculating the solar radiation intensity of each part of the human surface
The central control computer reads Solar radiation intensity signals Solar according to the sunlight illumination sensor, reads longitude and latitude, local time and azimuth angle of the vehicle according to the GPS positioning device,
calculating the solar altitude, wherein the calculation formula is as followsWherein hs is the solar altitude angle, phi is the latitude of the vehicle, delta is the solar declination of the current day, t is the solar time angle at the time, and the calculation formula is t=15 { Beijing time+ (longitude of the vehicle-120 °)/15 ° -12};
calculating the solar azimuth angle, wherein the calculation formula is as followsWherein A is the solar azimuth;
calculating a solar azimuth angle As taking the front-rear direction of the vehicle As the south, wherein a calculation formula is as=a-Av, and Av is an azimuth angle of the vehicle head;
the Solar radiation intensity of each part of the human body surface is calculated, and the formula is Si=f2 (Solar, hs, as), wherein Si is the Solar radiation intensity of each part of the human body surface.
S9, calculating the temperature and humidity of each part of the surface of the human body
When the air-out mode is a foot-blowing/defrosting/foot-blowing defrosting mode, the central control computer reads the signals of the temperature sensor and the humidity sensor in the vehicle and calculates the temperature and the humidity of each part of the air on the surface of the human body, and the calculation formula is as follows: ti=tinner, hi=hinner, where Ti represents the air temperature of each part of the human body surface, tinner represents the temperature of the in-vehicle temperature sensor, hi represents the air humidity of each part of the human body surface, hinner represents the humidity of the in-vehicle humidity sensor;
when the air outlet mode is a face/foot blowing mode, the central control computer firstly calculates initial values of air temperature and humidity of each part of the human body surface according to the relation between the air speed of each part of the human body surface and the air quantity of the air blower, the air outlet humidity of the air conditioner, the air return inlet humidity of the air conditioner and the air outlet mode, and according to the relation between the air speed of each part of the human body surface and the air quantity of the air blower, the air outlet temperature of the air conditioner, the air return inlet temperature of the air conditioner and the air outlet mode, and the calculation formula is as follows:
Ti0＝f3(Toutlet，Trecircle，Qblower，Model)，
hi0＝f4(houtlet，hrecircle，Qblower，Model)，
wherein Ti0 represents the initial value of the air temperature of each part of the human body surface, and hi0 represents the initial value of the air humidity of each part of the human body surface;
and then correcting the temperature and humidity of air on each part of the surface of the human body by using the temperature signal data in the vehicle, wherein the calculation formula is as follows:
Ti＝Ti0+(Tinner-Ti0 thigh of thigh )
hi＝hi0+(Tinner-hi0 Thigh of thigh )
Wherein Ti0 Thigh of thigh Represents the initial value of thigh surface air temperature hio Thigh of thigh The initial value of thigh surface air humidity is shown.
The beneficial effects of the invention are as follows: the vehicle passenger thermal environment parameter algorithm comprises an automobile air conditioning system, CFD simulation analysis software and an air conditioning dummy test system, wherein the relevant conditions of a blower, solar irradiation and air conditioning air outlet temperature and humidity on an air conditioning dummy are simulated in the CFD simulation analysis software to simulate the vehicle thermal environment of a vehicle passenger in actual conditions, the calculation steps are concise, the operation is efficient, the vehicle passenger thermal environment monitoring method adopting the algorithm utilizes the existing air conditioning air outlet temperature sensor, a sunlight sensor, an outside-vehicle temperature sensor and an air conditioning return air inlet temperature sensor, and on the premise of not adding any sensor, the thermal environment of the whole passenger and all parts of the body can be monitored in real time by reading the existing data such as vehicle-mounted GPS signals and calculating the thermal environment of a human body according to the preset algorithm obtained in the early design. The method lays a foundation for taking the human body thermal comfort as a target of an intelligent air conditioner control object and improving the comfort of the intelligent air conditioner in the next step. And lay the foundation for further realizing the full automation of air conditioner control and leading the driver to completely get rid of the related operation demands of the air conditioner.
Drawings
FIG. 1 is a flowchart of the steps of a vehicle occupant thermal environment parameter algorithm of the present invention.
Detailed Description
The present invention will be further described with reference to the drawings and examples, and it should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific manner, and thus should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, a vehicle occupant thermal environment parameter algorithm includes an automotive air conditioning system, and also includes CFD simulation analysis software and an air conditioning dummy test system, wherein the CFD simulation analysis software and the air conditioning dummy test system are existing in the market, the air conditioning dummy test system includes an air conditioning dummy, and the automotive air conditioning system includes a blower, an air conditioning air outlet and an air conditioning air return inlet, and includes the following steps:
s1, modeling the air conditioner dummy testing system and the automobile air conditioner system in a computer, and modeling a solar light irradiation simulation module;
s2, carrying out partition treatment on the surface of the air-conditioning dummy;
s3, inputting an air blower air quantity and an air outlet mode into the CFD simulation analysis software to obtain the relation between the air speed and the air blower air quantity of each part of the human body surface and the air outlet mode, wherein the relation is expressed by the following formula: f1 (Qblaster, model), wherein Qblaster is air conditioner blower air volume, model is air outlet mode.
S4, inputting sunlight irradiation intensity and sunlight irradiation azimuth into the CFD simulation analysis software to obtain the relationship among the sunlight irradiation intensity, the solar altitude angle, the azimuth angle and the solar irradiation intensity on the surface of the human body, wherein the relationship is represented by the following formula: f2 (Solar, hs, as), wherein Solar is Solar radiation intensity, hs is Solar altitude, and As is Solar azimuth angle with the vehicle front-rear direction being south.
S5, inputting blower air quantity, air conditioner air outlet temperature parameters and air outlet modes into the CFD simulation analysis software to obtain the relation between the air speeds of all parts of the human body surface and the blower air quantity, the air conditioner air outlet temperature, the air conditioner air return inlet temperature and the air outlet modes, wherein the relation is represented by the following formula: f3 And (Toutlet, trecircle, qbler, model), wherein Toutlet is the air outlet temperature, trecircle is the air inlet temperature, qbler is the air volume of an air conditioner blower, and Model is the air outlet mode.
S6, inputting blower air quantity, air conditioner air outlet humidity parameters and air outlet modes into the CFD simulation analysis software to obtain the relation between the air speed of each part of the human body surface and the blower air quantity, the air conditioner air outlet humidity, the air conditioner air return inlet humidity and the air outlet modes, wherein the relation is represented by the following formula: f4 (houtlet, hrecicle, qblower, model), wherein the houtlet is the air outlet humidity, hrecicle is the air inlet humidity, qblower is the air conditioner blower air volume, model is the air outlet mode.
In step S2, the human body surface is divided into a head, a face, a neck, shoulders, upper limbs, a chest, an abdomen, hands, lower limbs, and feet.
In step S3, the air volume of the blower is divided into 100% and 50%, the air outlet mode is divided into four modes of head, body outside and thigh, the CFD simulation analysis software is used for calculating the surface air velocity of each part of the human body in the modes, and the air velocity distribution measured in the CFD simulation analysis software is corrected by using the actual test result of the air conditioning dummy test system.
In step S4, the sunlight irradiation intensity is set to 1000w/m 2 The sunlight irradiation direction is set to be 9 cases in total, namely 90 degrees, 60 degrees before, 60 degrees about, 60 degrees after, 30 degrees before, 30 degrees about and 30 degrees after.
In steps S5 and S6, the blower air volume is divided into two stages of 100% and 50%, and the air outlet mode is divided into four modes of head, body outside and thigh.
The air outlet mode utilizes the CFD simulation analysis software to calculate the flow field of the passenger cabin, and comprises the following steps:
ss1. defining wind speed statistical surfaces corresponding to 4 modes based on R points of the seat arrangement of the automobile, wherein the R points are reference points of the automobile design during the initial whole automobile arrangement of the design;
ss2. changing the air outlet angle of each mode, calculating the flow field of the passenger cabin, and carrying out wind speed statistics on the wind speed statistical surface defined in the step Ss 1;
ss3. if the wind speed of the wind speed statistical surface is not satisfied, the wind outlet angle is further changed, and the step Ss2 is repeated until the wind speed of the wind speed statistical surface satisfies the target;
ss4. record the air outlet angle meeting the air speed target in the step Ss3, and define the air outlet angle as 4 modes of the air outlet.
Comprehensively considering the air conditioner air outlet temperature, the air conditioner return air inlet temperature, the air conditioner air outlet humidity and the air conditioner return air inlet humidity, calculating the environment air temperature of the human body, and further comprising the following steps:
sp1, initializing the thermal environment of a passenger cabin to be 60 ℃ and 30% of humidity;
sp2, calculating the temperature and humidity of hot ambient air in which a human body is positioned and the temperature and humidity of an air conditioner return air inlet in the following 4 processes;
a. ambient temperature 40℃and sunlight intensity 1000w/m 2 The temperature of the air outlet is gradually reduced from 60 ℃ to 0 ℃ at a speed of 2 DEG/min;
b. ambient temperature 40℃and sunlight intensity 500w/m 2 The temperature of the air outlet is gradually reduced from 60 ℃ to 0 ℃ at a speed of 2 DEG/min;
c. ambient temperature 30 ℃, sunlight intensity 0w/m 2 The temperature of the air outlet is gradually reduced from 60 ℃ to 0 ℃ at a speed of 2 DEG/min;
d. ambient temperature 30 ℃, sunlight intensity 0w/m 2 The temperature of the air outlet is gradually reduced from 60 ℃ to 0 ℃ at a speed of 0.5 DEG/min;
sp3, respectively considering two conditions of maximum air quantity and minimum air quantity of the blower;
sp4, counting the relation between the temperature and humidity of the hot ambient air where the human body is located and the temperature and humidity of the air outlet and the air return inlet of the air conditioner.
The embodiment also provides a vehicle occupant thermal environment monitoring method, which comprises an automobile, and further comprises the vehicle occupant thermal environment parameter algorithm, wherein the vehicle occupant thermal environment parameter algorithm is arranged in a central control computer of the automobile, a GPS positioning device, a sunlight illumination sensor, an outside-automobile temperature sensor, an inside-automobile temperature sensor and an inside-automobile humidity sensor which are electrically connected with the central control computer are further arranged on the automobile, an air conditioner air outlet is provided with an air conditioner air outlet temperature sensor and an air conditioner return air inlet humidity sensor, and an air conditioner return air inlet is provided with an air conditioner return air inlet temperature sensor and an air conditioner return air inlet humidity sensor, and further comprises the following steps:
s7, calculating the wind speed of each part of the surface of the human body
The central control computer reads an air outlet mode signal and an air blower air quantity signal according to the relation between the air speed and the air blower air quantity of each part of the human body surface and the air outlet mode, calculates the air speed of each part of the human body surface, and has a calculation formula of vi=f1 (Qblower, model), wherein Vi is the air speed of each part of the human body surface;
s8, calculating the solar radiation intensity of each part of the human surface
The central control computer reads Solar radiation intensity signals Solar according to the sunlight illumination sensor, reads longitude and latitude, local time and azimuth angle of the vehicle according to the GPS positioning device,
calculating the solar altitude, wherein the calculation formula is as followsWherein hs is the solar altitude angle, phi is the latitude of the vehicle, delta is the solar declination of the current day, t is the solar time angle at the time, and the calculation formula is t=15 { Beijing time+ (longitude of the vehicle-120 °)/15 ° -12};
calculating the solar azimuth angle, wherein the calculation formula is as followsWherein A is the solar azimuth;
calculating a solar azimuth angle As taking the front-rear direction of the vehicle As the south, wherein a calculation formula is as=a-Av, and Av is an azimuth angle of the vehicle head;
the Solar radiation intensity of each part of the human body surface is calculated, and the formula is Si=f2 (Solar, hs, as), wherein Si is the Solar radiation intensity of each part of the human body surface.
S9, calculating the temperature and humidity of each part of the surface of the human body
When the air-out mode is a foot-blowing/defrosting/foot-blowing defrosting mode, the central control computer reads the signals of the temperature sensor and the humidity sensor in the vehicle and calculates the temperature and the humidity of each part of the air on the surface of the human body, and the calculation formula is as follows: ti=tinner, hi=hinner, where Ti represents the air temperature of each part of the human body surface, tinner represents the temperature of the in-vehicle temperature sensor, hi represents the air humidity of each part of the human body surface, hinner represents the humidity of the in-vehicle humidity sensor;
when the air outlet mode is a face/foot blowing mode, the central control computer firstly calculates initial values of air temperature and humidity of each part of the human body surface according to the relation between the air speed of each part of the human body surface and the air quantity of the air blower, the air outlet humidity of the air conditioner, the air return inlet humidity of the air conditioner and the air outlet mode, and according to the relation between the air speed of each part of the human body surface and the air quantity of the air blower, the air outlet temperature of the air conditioner, the air return inlet temperature of the air conditioner and the air outlet mode, and the calculation formula is as follows:
Ti0＝f3(Toutlet，Trecircle，Qblower，Model)，
hi0＝f4(houtlet，hrecircle，Qblower，Model)，
wherein Ti0 represents the initial value of the air temperature of each part of the human body surface, and hi0 represents the initial value of the air humidity of each part of the human body surface;
and then correcting the temperature and humidity of air on each part of the surface of the human body by using the temperature signal data in the vehicle, wherein the calculation formula is as follows:
Ti＝Ti0+(Tinner-Ti0 thigh of thigh )
hi＝hi0+(Tinner-hi0 Thigh of thigh )
Wherein Ti0 Thigh of thigh Represents the initial value of thigh surface air temperature hio Thigh of thigh The initial value of thigh surface air humidity is shown.
The invention aims to provide a real-time monitoring method for the thermal environment of an automobile passenger, which can monitor the thermal environment of the whole passenger and each part of the body in real time, including temperature, humidity, thermal radiation and wind speed.
The technology is a basis for realizing intelligent air conditioner control, the real-time thermal feeling and thermal comfort of a human body can be calculated and obtained through a human body thermal comfort model by utilizing the thermal environment monitored in real time by the technology, and the real-time thermal feeling and thermal comfort can be used as a control target of the intelligent air conditioner, so that the manual set temperature is prevented from being used as a necessary input condition, the full automation of air conditioner control is realized, and a driver can meet the thermal comfort requirement without performing any air conditioner related operation.
Based on a real-time thermal environment monitoring system, the thermal comfort is used as a control target of the intelligent air conditioner, the effect of adjusting the direction of the air outlet of the air conditioner is played to the greatest extent, and the aim of meeting the thermal comfort requirement of a human body with the lowest air conditioner energy consumption is achieved.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (8)
1. A vehicle occupant thermal environment parameter algorithm comprises an automobile air conditioning system and is characterized in that: the air conditioner dummy test system comprises an air conditioner dummy, and the automobile air conditioner system comprises a blower, an air conditioner air outlet and an air conditioner air return port, and comprises the following steps:
s1, modeling the air conditioner dummy testing system and the automobile air conditioner system in a computer, and modeling a solar light irradiation simulation module;
s2, carrying out partition treatment on the surface of the air-conditioning dummy;
s3, inputting an air blower air quantity and an air outlet mode into the CFD simulation analysis software to obtain the relation between the air speed and the air blower air quantity of each part of the human body surface and the air outlet mode, wherein the relation is expressed by the following formula: f1 (Qblaster, model), wherein Qblaster is air conditioner blower air volume, model is air outlet mode;
s4, inputting sunlight irradiation intensity and sunlight irradiation azimuth into the CFD simulation analysis software to obtain the relationship among the sunlight irradiation intensity, the solar altitude angle, the azimuth angle and the solar irradiation intensity on the surface of the human body, wherein the relationship is represented by the following formula: f2 (Solar, hs, as), wherein Solar is Solar radiation intensity, hs is Solar altitude, and As is Solar azimuth with the vehicle front-rear direction being south;
s5, inputting blower air quantity, air conditioner air outlet temperature parameters and air outlet modes into the CFD simulation analysis software to obtain the relation between the air speeds of all parts of the human body surface and the blower air quantity, the air conditioner air outlet temperature, the air conditioner air return inlet temperature and the air outlet modes, wherein the relation is represented by the following formula: f3 (Toutlet, trecircle, qbler, model), wherein Toutlet is air outlet temperature, trecircle is air inlet temperature, qbler is air conditioner blower air volume, model is air outlet mode;
s6, inputting blower air quantity, air conditioner air outlet humidity parameters and air outlet modes into the CFD simulation analysis software to obtain the relation between the air speed of each part of the human body surface and the blower air quantity, the air conditioner air outlet humidity, the air conditioner air return inlet humidity and the air outlet modes, wherein the relation is represented by the following formula: f4 (houtlet, hrecicle, qblower, model), wherein the houtlet is the air outlet humidity, hrecicle is the air inlet humidity, qblower is the air conditioner blower air volume, model is the air outlet mode.
2. The vehicle occupant thermal environment parameter algorithm of claim 1, wherein: in step S2, the surface of the air-conditioning dummy is divided into a head, a face, a neck, a shoulder, an upper limb, a chest, an abdomen, a hand, a lower limb and a foot.
3. A vehicle occupant thermal environment parameter algorithm according to claim 1 or 2, characterized in that: in step S3, the air volume of the blower is divided into 100% and 50%, the air outlet mode is divided into four modes of head, body outside and thigh, the CFD simulation analysis software is used for calculating the surface air velocity of each part of the human body in the modes, and the air velocity distribution measured in the CFD simulation analysis software is corrected by using the actual test result of the air conditioning dummy test system.
4. A vehicle occupant thermal environment parameter algorithm according to claim 1 or 2, characterized in that: in step S4, the sunlight irradiation intensity is set to 1000w/m, and the sunlight irradiation direction is set to 9 cases in total, which are 90 degrees, 60 degrees before, 60 degrees about, 60 degrees after, 30 degrees before, 30 degrees about, 30 degrees after.
5. A vehicle occupant thermal environment parameter algorithm according to claim 1 or 2, characterized in that: in steps S5 and S6, the blower air volume is divided into two stages of 100% and 50%, and the air outlet mode is divided into four modes of head, body outside and thigh.
6. The vehicle occupant thermal environment parameter algorithm according to claim 5, wherein: the air outlet mode utilizes the CFD simulation analysis software to calculate the flow field of the passenger cabin, and comprises the following steps:
ss1. defining wind speed statistical surfaces corresponding to 4 modes based on R points of the seat arrangement of the automobile, wherein the R points are reference points of the automobile design during the initial whole automobile arrangement of the design;
ss2. changing the air outlet angle of each mode, calculating the flow field of the passenger cabin, and carrying out wind speed statistics on the wind speed statistical surface defined in the step Ss 1;
ss3. if the wind speed of the wind speed statistical surface is not satisfied, the angle of the air outlet is further changed, and the step Ss2 is repeated until the wind speed of the wind speed statistical surface satisfies the target;
ss4. The air outlet angle meeting the air speed target in the step Ss3 is recorded, and the air outlet angle is defined as 4 modes of the air outlet.
7. The vehicle occupant thermal environment parameter algorithm according to claim 5, wherein: comprehensively considering the air conditioner air outlet temperature, the air conditioner return air inlet temperature, the air conditioner air outlet humidity and the air conditioner return air inlet humidity, calculating the environment air temperature of the human body, and further comprising the following steps:
sp1, initializing the thermal environment of a passenger cabin to be 60 ℃ and 30% of humidity;
sp2, calculating the temperature and humidity of hot ambient air where a human body is and the temperature and humidity of an air conditioner return air inlet in the following 4 processes;
a. the ambient temperature is 40 ℃, the sunlight intensity is 1000w/m, the temperature of the air outlet is gradually reduced from 60 ℃ to 0 ℃, and the speed is reduced by 2 DEG/min;
b. the ambient temperature is 40 ℃, the sunlight intensity is 500w/m, the temperature of the air outlet is gradually reduced from 60 ℃ to 0 ℃, and the speed is reduced by 2 DEG/min;
c. the ambient temperature is 30 ℃, the sunlight intensity is 0w/m < DEG >;
d. the ambient temperature is 30 ℃, the sunlight intensity is 0w/m, the temperature of the air outlet is gradually reduced from 60 ℃ to 0 ℃, and the speed is reduced by 0.5 DEG/min;
sp3, respectively considering two conditions of maximum air quantity and minimum air quantity of the blower;
sp4, counting the relation between the temperature and humidity of the hot ambient air where the human body is located and the temperature and humidity of the air outlet and the air return inlet of the air conditioner.
8. A method for monitoring the thermal environment of a vehicle occupant comprises an automobile and is characterized in that: the vehicle passenger thermal environment parameter algorithm is arranged in a central control computer of the vehicle, the vehicle is further provided with a GPS positioning device, a sunlight illumination sensor, an outside temperature sensor, an inside temperature sensor and an inside humidity sensor which are electrically connected with the central control computer, an air conditioner air outlet is provided with an air conditioner air outlet temperature sensor and an air conditioner return air inlet humidity sensor, and the air conditioner return air inlet is provided with an air conditioner return air inlet temperature sensor and an air conditioner return air inlet humidity sensor, and the vehicle passenger thermal environment parameter algorithm further comprises the following steps:
s7, calculating the wind speed of each part of the human body surface
The central control computer reads an air outlet mode signal and an air blower air quantity signal according to the relation between the air speed and the air blower air quantity of each part of the human body surface and the air outlet mode, calculates the air speed of each part of the human body surface, and has a calculation formula of vi=f1 (Qblower, model), wherein Vi is the air speed of each part of the human body surface;
s8, calculating the solar radiation intensity of each part of the human body surface
The central control computer reads Solar radiation intensity signals Solar according to the sunlight illumination sensor, and reads longitude and latitude, local time and azimuth angle of the vehicle according to the GPS positioning device;
calculating a solar altitude angle, wherein a calculation formula is hs=arcsin (sin phi sin delta+cos phi cos delta) and is that, hs is the solar altitude angle, phi is the latitude of the vehicle, delta is the solar declination of the current day, t is the current solar time angle, and a calculation formula is t=15 { Beijing time+ (longitude of the vehicle-120 degrees)/15-12 degrees };
calculating a solar azimuth angle, wherein the calculation formula is A=arccoss (sinhs-sindelta)/cosis phi, and A is the solar azimuth angle;
calculating a solar azimuth angle As taking the front-rear direction of the vehicle As the south, wherein a calculation formula is as=a-Av, and Av is an azimuth angle of the vehicle head;
calculating the Solar radiation intensity of each part of the surface of the human body, wherein the formula is Si=f2 (Solar, hs, as), and Si is the Solar radiation intensity of each part of the surface of the human body;
s9, calculating the temperature and humidity of each part of the surface of the human body
When the air-out mode is a foot-blowing/defrosting/foot-blowing defrosting mode, the central control computer reads the signals of the temperature sensor and the humidity sensor in the vehicle and calculates the temperature and the humidity of each part of the air on the surface of the human body, and the calculation formula is as follows: ti=tinner, hi=hinner, where Ti represents the air temperature of each part of the human body surface, tinner represents the temperature of the in-vehicle temperature sensor, hi represents the air humidity of each part of the human body surface, hinner represents the humidity of the in-vehicle humidity sensor;
when the air outlet mode is a face/foot blowing mode, the central control computer firstly calculates initial values of air temperature and humidity of each part of the human body surface according to the relation between the air speed of each part of the human body surface and the air quantity of the air blower, the air outlet humidity of the air conditioner, the air return inlet humidity of the air conditioner and the air outlet mode, and according to the relation between the air speed of each part of the human body surface and the air quantity of the air blower, the air outlet temperature of the air conditioner, the air return inlet temperature of the air conditioner and the air outlet mode, and the calculation formula is as follows:
Ti0=f3(Toutlet，Trecircle，Qblower，Model)，
hi0=f4(houtlet，hrecircle，Qblower，Model)，
wherein Ti0 represents the initial value of the air temperature of each part of the human body surface, and hi0 represents the initial value of the air humidity of each part of the human body surface;
and then correcting the temperature and humidity of air on each part of the surface of the human body by using the temperature signal data in the vehicle, wherein the calculation formula is as follows:
Ti=Ti0+(Tinner-Ti0 thigh of thigh )
hi=hi0+(Tinner-hi0 Thigh of thigh )
Wherein Ti0 Thigh of thigh Represents the initial value of thigh surface air temperature hio Thigh of thigh The initial value of thigh surface air humidity is shown.
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