CN109344557B - Method and system for analyzing thermal performance of automobile - Google Patents
Method and system for analyzing thermal performance of automobile Download PDFInfo
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- CN109344557B CN109344557B CN201811456730.7A CN201811456730A CN109344557B CN 109344557 B CN109344557 B CN 109344557B CN 201811456730 A CN201811456730 A CN 201811456730A CN 109344557 B CN109344557 B CN 109344557B
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Abstract
The invention provides a method and a system for analyzing thermal performance of an automobile, wherein the method comprises the following steps: acquiring engine oil flow data, combustion chamber temperature data, combustion chamber exhaust flow data, water jacket heat transfer data, coolant flow data, vehicle front end air intake data, passenger compartment model data and passenger compartment temperature data; establishing a combustion heat transfer model according to the combustion chamber temperature data, the water jacket heat transfer data and the combustion chamber exhaust flow data; establishing a lubricating system heat transfer model according to the engine oil flow data, the combustion chamber temperature data and the combustion chamber exhaust flow data; establishing a cooling system heat exchange model according to water jacket heat transfer data, cooling liquid flow data and vehicle front end air intake data; establishing a passenger compartment heat exchange model according to the passenger compartment model data and the passenger compartment temperature data; and carrying out temperature rise calculation on the whole vehicle through the combustion heat transfer model, the lubricating system heat transfer model, the cooling system heat exchange model and the passenger compartment heat exchange model. The invention can improve the accuracy of the automobile temperature rise analysis.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to an analysis method and system for automobile thermal performance.
Background
With the development of automobile technology and the improvement of living standard, people put forward higher and higher requirements on automobile thermal performance. In the whole vehicle development process, thermal performance design requires that the vehicle is neither overheated nor overcooled under all driving conditions, but in fact often pay more attention to cooling heat dispersion, but pay more attention to inadequacy in the aspect of thermal comfort of passengers, especially for big temperature difference in north and south regions, the problem of losing one another is more likely to occur in the aspect of carrying out whole vehicle thermal system performance design, or the problem of low heating water temperature and thermal comfort in cold regions in winter due to excessive cooling performance design, or the problem of boiling in special regions in summer due to insufficient cooling capacity design. Thermal performance data are usually obtained through an engine pedestal thermal balance test, and the data have larger deviation for the transient temperature rise analysis of the thermal balance of the whole vehicle. Therefore, how to effectively analyze the thermal performance of the automobile has important research significance on the thermal balance of the whole automobile.
Disclosure of Invention
The invention provides a method and a system for analyzing thermal performance of an automobile, which solve the problem that the thermal balance analysis has large error due to thermal performance data obtained by an engine bench thermal balance test of the existing automobile, and can improve the accuracy of the thermal balance analysis of the automobile and the performance of the automobile.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method of analyzing thermal properties of an automobile, comprising:
acquiring engine oil flow data, combustion chamber temperature data, combustion chamber exhaust flow data, water jacket heat transfer data, coolant flow data, vehicle front end air intake data, passenger compartment model data and passenger compartment temperature data;
establishing a combustion heat transfer model according to the combustion chamber temperature data, the water jacket heat transfer data and the combustion chamber exhaust flow data;
establishing a lubricating system heat transfer model according to the engine oil flow data, the combustion chamber temperature data and the combustion chamber exhaust flow data;
establishing a cooling system heat exchange model according to the water jacket heat transfer data, the cooling liquid flow data and the vehicle front end air intake data;
establishing a passenger compartment heat exchange model according to the passenger compartment model data and the passenger compartment temperature data;
and carrying out temperature rise calculation on the whole vehicle in the environmental bin through the combustion heat transfer model, the lubricating system heat transfer model, the cooling system heat exchange model and the passenger compartment heat exchange model.
Preferably, the method further comprises the following steps:
obtaining the temperature rise time of a cooling system, a lubricating system and a passenger compartment under each working condition through temperature rise calculation;
and if the temperature rise time is larger than a set time threshold value, determining that the thermal performance of the vehicle is unqualified.
Preferably, the method further comprises the following steps:
acquiring water temperature data of the cooling system through temperature rise calculation;
and comparing the water temperature data with the environmental chamber test data, and if the difference value of the water temperature data and the environmental chamber test data is smaller than a first threshold value, determining that the analysis model is effective and the cooling system is qualified in heat exchange.
Preferably, the method further comprises the following steps:
calculating and acquiring air temperature data of the passenger compartment through temperature rise;
and comparing the air temperature data with the environmental chamber test data, and if the difference value of the air temperature data and the environmental chamber test data is smaller than a second threshold value, determining that the analysis model is effective, and determining that the heat exchange of the passenger chamber is qualified.
Preferably, the combustion heat transfer model comprises: the device comprises an exhaust heat exchange model, an environment heat exchange model, a water jacket heat exchange model and a combustion chamber heat exchange model.
Preferably, the lubricating system heat transfer model comprises: the engine oil pump heat transfer model, the oil pan heat transfer model, the crankshaft heat transfer model, the camshaft heat transfer model and the piston heat transfer model.
Preferably, the cooling system heat exchange model comprises: the heat exchange device comprises an air inlet heat exchange model, a cooling pump heat exchange model, a warm air core body heat exchange model and an air blower heat exchange model.
Preferably, the heat exchange model of the passenger compartment comprises: the heat exchange device comprises an instrument board heat exchange model, a passenger heat exchange model, a seat heat exchange model, a passenger cabin shell heat exchange model and a solar thermal radiation heat exchange model.
The invention also provides a system for analyzing the thermal performance of the automobile, which comprises:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring engine oil flow data, combustion chamber temperature data, combustion chamber exhaust flow data, water jacket heat transfer data, cooling liquid flow data, vehicle front end air intake data, passenger compartment model data and passenger compartment temperature data;
the combustion chamber modeling unit is used for establishing a combustion heat transfer model according to the combustion chamber temperature data, the water jacket heat transfer data and the combustion chamber exhaust flow data;
the lubricating system modeling unit is used for establishing a lubricating system heat transfer model according to the engine oil flow data, the combustion chamber temperature data and the combustion chamber exhaust flow data;
the cooling system modeling unit is used for establishing a cooling system heat exchange model according to the water jacket heat transfer data, the cooling liquid flow data and the vehicle front end air intake data;
the passenger cabin modeling unit is used for establishing a passenger cabin heat exchange model according to the passenger cabin model data and the passenger cabin temperature data;
and the test unit is used for carrying out temperature rise calculation on the whole vehicle in the environmental chamber through the combustion heat transfer model, the lubricating system heat transfer model, the cooling system heat exchange model and the passenger compartment heat exchange model.
Preferably, the method further comprises the following steps:
the first judgment unit is used for acquiring the temperature rise time of the combustion chamber, the cooling system, the lubricating system and the passenger compartment under each working condition through temperature rise calculation, and determining that the thermal performance of the vehicle is unqualified when the temperature rise time is greater than a set time threshold;
and the second judgment unit is used for acquiring water temperature data of the cooling system through temperature rise calculation, comparing the water temperature data with the environmental chamber test data, and determining that the analysis model is effective and the cooling system is qualified in heat exchange when the difference value between the water temperature data and the environmental chamber test data is smaller than a first threshold value.
And the third judgment unit is used for acquiring air temperature data of the passenger cabin through temperature rise calculation, comparing the air temperature data with environmental cabin test data, and determining that the analysis model is effective and the heat exchange of the passenger cabin is qualified when the difference value of the air temperature data and the environmental cabin test data is smaller than a second threshold value.
The invention provides a method and a system for analyzing thermal performance of an automobile, which are used for carrying out temperature rise analysis by establishing a combustion heat transfer model, a lubricating system heat transfer model, a cooling system heat exchange model and a passenger compartment heat exchange model, solving the problem that the thermal balance analysis has large error due to thermal performance data obtained by an engine pedestal thermal balance test of the existing automobile, improving the accuracy of the thermal balance analysis of the automobile and improving the performance of the automobile.
Drawings
In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.
FIG. 1: the invention provides a flow chart of an analysis method for automobile thermal performance;
FIG. 2: the invention provides a flow chart of an analysis method for automobile thermal performance.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
Aiming at the problem that the current thermal performance analysis data of the automobile is inaccurate, the invention provides an analysis method and a system for the thermal performance of the automobile.
As shown in fig. 1, a method for analyzing thermal properties of an automobile includes:
s1: acquiring engine oil flow data, combustion chamber temperature data, combustion chamber exhaust flow data, water jacket heat transfer data, coolant flow data, vehicle front end air intake data, passenger compartment model data and passenger compartment temperature data;
s2: establishing a combustion heat transfer model according to the combustion chamber temperature data, the water jacket heat transfer data and the combustion chamber exhaust flow data;
s3: establishing a lubricating system heat transfer model according to the engine oil flow data, the combustion chamber temperature data and the combustion chamber exhaust flow data;
s4: establishing a cooling system heat exchange model according to the water jacket heat transfer data, the cooling liquid flow data and the vehicle front end air intake data;
s5: establishing a passenger compartment heat exchange model according to the passenger compartment model data and the passenger compartment temperature data;
s6: and calculating the temperature rise of the environmental chamber of the whole vehicle through the combustion heat transfer model, the lubricating system heat transfer model, the cooling system heat exchange model and the passenger compartment heat exchange model.
Specifically, as shown in fig. 2, the thermal performance analysis model mainly includes four parts, namely a cooling system heat exchange model, a lubrication system heat transfer model, a combustion heat transfer model, and a passenger compartment heat exchange model. The boundary of the lubricating system heat transfer model is an engine oil flow MAP graph, the temperature of a combustion chamber, an engine digital model and the material attribute of the combustion chamber are heat source boundaries in the lubricating system heat transfer model, and the engine digital model and the material attribute define a heat path for transferring the temperature of the combustion chamber to the lubricating system. The heat source in the combustion heat transfer model is mainly the in-cylinder combustion temperature which is conducted to the engine water jacket and the oil duct through the cylinder body metal structure, the effect of transferring heat to the cooling system and the lubricating system is achieved, the boundary of the combustion heat transfer model is the combustion chamber temperature, the exhaust flow, the engine digital model, the engine material attribute and the water jacket characteristic data, the combustion chamber temperature is the heat source, the exhaust flow determines the heat quantity transferred to the cooling liquid by the high-temperature gas at the exhaust manifold, the engine digital model and the material attribute determine the heat transfer path, and the water jacket characteristic determines the heat quantity transferred to the cooling liquid by the water jacket. The boundary of the cooling system heat exchange model is cooling liquid flow distribution data and sending cabin front end module air intake data, wherein the cooling liquid flow distribution determines the flow distribution condition of each branch of the system, and the sending cabin front end module air intake data determines the air volume data of components such as a radiator. The boundary of the heat exchange model of the passenger cabin is a digital model and material attributes of the passenger cabin, and the model mainly obtains the space, the gas circulation path, the heat dissipation condition to the environment, the heat absorption condition of each part of the passenger cabin and the like according to the digital model and the material attributes.
Further, the method also includes:
obtaining the temperature rise time of a cooling system, a lubricating system and a passenger compartment under each working condition through temperature rise calculation; and if the temperature rise time is larger than a set time threshold value, determining that the thermal performance of the vehicle is unqualified.
Specifically, each data obtained through model analysis is compared only through an environment bin temperature rise test, on one hand, the analysis precision is verified, and on the other hand, whether the vehicle temperature rise performance meets the required value or not is judged. And if the temperature rise time is larger than the set time threshold value, determining that the thermal performance of the vehicle is unqualified.
The method further comprises the following steps:
acquiring water temperature data of the cooling system through temperature rise calculation; and comparing the water temperature data with the environmental chamber test data, and if the difference value of the water temperature data and the environmental chamber test data is smaller than a first threshold value, determining that the analysis model is effective and the cooling system is qualified in heat exchange.
Specifically, the obtained water temperature data is compared with the environmental chamber test data, if the difference value is small, the analysis model is considered to have enough precision and effective, and subsequent temperature rise analysis and verification of an optimization scheme can be performed.
The method further comprises the following steps:
calculating and acquiring air temperature data of the passenger compartment through temperature rise; and comparing the air temperature data with the environmental chamber test data, and if the difference value of the air temperature data and the environmental chamber test data is smaller than a second threshold value, determining that the analysis model is effective and the heat exchange of the passenger chamber is qualified.
The combustion heat transfer model includes: the device comprises an exhaust heat exchange model, an environment heat exchange model, a water jacket heat exchange model and a combustion chamber heat exchange model.
In practical application, as shown in fig. 2, the combustion heat transfer model mainly transfers heat to the cooling system through the water jacket, and the purpose of exchanging heat between the lubricating system and the cooling system is achieved through the thermal bridges of various parts. The model mainly comprises an exhaust manifold model (simulating the heating effect of exhaust temperature and exhaust mass flow on a cooling system, and an exhaust temperature and exhaust mass flow MAP), an environment heat exchange model (realizing the heat convection and heat radiation effect on the external low-temperature environment), a water jacket heat exchange coefficient model (corresponding to different heat exchange coefficients under different coolant flows, different heat exchange coefficients can influence the heating effect of the temperature in a combustion chamber on coolant, and the model realizes the purpose of accurately simulating and transmitting the heat of a cooling water jacket), and a combustion chamber heat exchange model (realizing the purpose of heating effect of the temperature in the combustion chamber on a cylinder body and a cylinder cover water jacket through a metal wall surface).
The lubrication system heat transfer model comprises: the engine oil pump heat transfer model, the oil pan heat transfer model, the crankshaft heat transfer model, the camshaft heat transfer model and the piston heat transfer model.
In practical application, as shown in fig. 2, the heat transfer model of the lubrication system receives heat including heat generated by combustion chamber and friction, the heat dissipation path includes heat absorption by heat capacity of metal at each position and heat dissipation by oil pan to low temperature environment, and the model and the combustion heat transfer model are connected through a thermal bridge model to realize mutual influence of temperature and heat transfer. The model comprises an oil pump model (introducing oil pump flow and friction work), an oil bottom shell model (dissipating environmental heat and storing engine oil), a crankshaft model (introducing crankshaft flow and crankshaft friction work), a camshaft model (introducing camshaft flow and camshaft friction work), a piston model (heating oil film by the temperature of a combustion chamber and introducing friction work), various controllers and mass elements (simulating the metal mass and size of each position in a cylinder body and realizing the effect of heat capacity). The system components have different flow rates under different rotating speeds and temperatures, and the heat quantity introduced into the system is different due to different flow rates, so that oil flow rate MAP MAPs of all components need to be defined.
The cooling system heat exchange model comprises: the heat exchange device comprises an air inlet heat exchange model, a cooling pump heat exchange model, a warm air core body heat exchange model and an air blower heat exchange model.
In practical application, as shown in fig. 2, the heat exchange model of the cooling system is mainly heated by the combustion chamber, the temperature of the system is increased, and the water temperature is reduced under the action of the radiator and the warm air. The air side model is an assembly model for dissipating heat to the environment, and simulates the interaction among a front-end grille of a vehicle, a condenser, a radiator and a cooling fan. The water pump control model is a structural model for controlling the rotating speed of the water pump according to the rotating speed of the engine and realizing real-time flow change of the water pump. The warm air model comprises a warm air core model and a blower model, and the warm air model is a structure for bringing heat of a cooling system into a passenger compartment after the warm air blower is started.
The passenger compartment heat exchange model comprises: the heat exchange device comprises an instrument board heat exchange model, a passenger heat exchange model, a seat heat exchange model, a passenger cabin shell heat exchange model and a solar thermal radiation heat exchange model.
In practical application, as shown in fig. 2, the heat exchange model of the passenger compartment simulates the heat transfer relationship of hot air heated by hot air after entering the passenger compartment, and the model mainly simulates the mass, size and structure of each component inside the passenger compartment, and simulates the heat absorption, external heat radiation loss and heating effect of the sun on the inside of the passenger compartment after hot air enters each component. The heat dissipation device comprises an instrument board model (an instrument board structure is firstly contacted with heated air coming from warm air, and the model simulates the heat absorption effect of the heated air), a passenger model (the heat radiation effect of passengers in a passenger compartment is simulated), a passenger compartment space model (the transmission path of simulated airflow in the passenger compartment is different in airflow speed at different positions), a seat model (the heat capacity of a seat is simulated to realize the heat absorption effect), a front windshield model and a rear windshield model (the effect that heat is lost to the outside through windshields is realized), a solar heat radiation model (the heating effect of sunlight on the inside of the passenger compartment is realized), a roof model (the effect that the heat loss and the heat capacity are realized by defining the material size and the attribute of each layer of the roof), and a door model realizes the effect that the heat loss and the heat capacity are realized by defining the.
The invention provides an analysis method for thermal performance of an automobile, which is used for carrying out temperature rise analysis by establishing a combustion heat transfer model, a lubricating system heat transfer model, a cooling system heat transfer model and a passenger compartment heat transfer model, solving the problem that the thermal balance analysis has large error due to thermal performance data obtained by an engine pedestal thermal balance test of the existing automobile, and being capable of improving the accuracy of the thermal balance analysis of the automobile and improving the performance of the automobile.
The invention also provides a system for analyzing the thermal performance of the automobile, which comprises: and the acquisition unit is used for acquiring engine oil flow data, combustion chamber temperature data, combustion chamber exhaust flow data, water jacket heat transfer data, coolant flow data, vehicle front end air intake data and passenger compartment temperature data. And the combustion chamber modeling unit is used for establishing a combustion heat transfer model according to the combustion chamber temperature data, the water jacket heat transfer data and the combustion chamber exhaust flow data. And the lubricating system modeling unit is used for establishing a lubricating system heat transfer model according to the engine oil flow data, the combustion chamber temperature data and the combustion chamber exhaust flow data. And the cooling system modeling unit is used for establishing a cooling system heat exchange model according to the water jacket heat transfer data, the cooling liquid flow data and the vehicle front end air intake data. And the passenger cabin modeling unit is used for establishing a passenger cabin heat exchange model according to the passenger cabin temperature data. And the test unit is used for carrying out environmental bin temperature rise calculation on the whole vehicle based on the combustion heat transfer model, the lubricating system heat transfer model, the cooling system heat exchange model and the passenger compartment heat exchange model.
Further, the system further comprises: the first judging unit is used for obtaining the temperature rise time of the cooling system, the lubricating system and the passenger compartment under each working condition through temperature rise calculation, and determining that the thermal performance of the vehicle is unqualified when the temperature rise time is larger than a set time threshold. And the second judgment unit is used for acquiring water temperature data of the cooling system through temperature rise calculation, comparing the water temperature data with the environmental chamber test data, and determining that the analysis model is effective and the cooling system is unqualified in heat exchange if the difference value between the water temperature data and the environmental chamber test data is smaller than a first threshold value. And the third judgment unit is used for acquiring air temperature data of the passenger cabin through temperature rise calculation, comparing the air temperature data with environmental cabin test data, and determining that the analysis model is effective and the heat exchange of the passenger cabin is unqualified when the difference value between the air temperature data and the environmental cabin test data is smaller than a second threshold value.
Therefore, the invention provides an analysis system for the thermal performance of an automobile, which is used for carrying out temperature rise calculation by establishing a combustion heat transfer model, a lubricating system heat transfer model, a cooling system heat exchange model and a passenger compartment heat exchange model, solves the problem that the thermal performance data obtained by the existing automobile through an engine bench thermal balance test has large error in thermal balance analysis, and can improve the accuracy of the thermal balance analysis of the automobile and the performance of the automobile.
The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.
Claims (10)
1. A method of analyzing thermal properties of an automobile, comprising:
acquiring engine oil flow data, combustion chamber temperature data, combustion chamber exhaust flow data, water jacket heat transfer data, coolant flow data, vehicle front end air intake data, passenger compartment model data and passenger compartment temperature data;
establishing a combustion heat transfer model according to the combustion chamber temperature data, the water jacket heat transfer data and the combustion chamber exhaust flow data, wherein a heat source in the combustion heat transfer model is mainly the in-cylinder combustion temperature which is transmitted to an engine water jacket and an oil duct through a cylinder body metal structure, so that the heat is transmitted to a cooling system and a lubricating system;
establishing a lubricating system heat transfer model according to the engine oil flow data, the combustion chamber temperature data and the combustion chamber exhaust flow data, wherein an engine oil flow MAP, a combustion chamber temperature, an engine digital model and a material attribute combustion chamber temperature are heat source boundaries in the lubricating system heat transfer model, and the engine digital model and the material attribute define a heat path for transferring the combustion chamber temperature to a lubricating system;
establishing a cooling system heat exchange model according to the water jacket heat transfer data, the cooling liquid flow data and the vehicle front end air intake data, wherein the boundaries of the cooling system heat exchange model are cooling liquid flow distribution data and sending cabin front end module air intake data, the cooling liquid flow distribution determines the flow distribution condition of each branch of the system, and the sending cabin front end module air intake data determines the air volume data of the radiator;
establishing a passenger compartment heat exchange model according to the passenger compartment model data and the passenger compartment temperature data, wherein the boundary of the passenger compartment heat exchange model is a passenger compartment digital model and material attributes, and the model mainly obtains the space of the passenger compartment, the gas circulation path, the heat dissipation condition to the environment and the heat absorption condition of each part of the passenger compartment according to the digital model and the material attributes;
and carrying out temperature rise calculation on the whole vehicle in the environmental bin through the combustion heat transfer model, the lubricating system heat transfer model, the cooling system heat exchange model and the passenger compartment heat exchange model.
2. The method for analyzing thermal properties of an automobile according to claim 1, further comprising:
obtaining the temperature rise time of a cooling system, a lubricating system and a passenger compartment under each working condition through temperature rise calculation;
and if the temperature rise time is larger than a set time threshold value, determining that the thermal performance of the vehicle is unqualified.
3. The method for analyzing thermal properties of an automobile according to claim 2, further comprising:
acquiring water temperature data of the cooling system through temperature rise calculation;
and comparing the water temperature data with the environmental chamber test data, and if the difference value of the water temperature data and the environmental chamber test data is smaller than a first threshold value, determining that the analysis model is effective and the cooling system is qualified in heat exchange.
4. The method for analyzing thermal properties of an automobile according to claim 3, further comprising:
calculating and acquiring air temperature data of the passenger compartment through temperature rise;
and comparing the air temperature data with the environmental chamber test data, and if the difference value of the air temperature data and the environmental chamber test data is smaller than a second threshold value, determining that the analysis model is effective, and determining that the heat exchange of the passenger chamber is qualified.
5. The method for analyzing thermal properties of an automobile according to claim 1, wherein the combustion heat transfer model comprises: the device comprises an exhaust heat exchange model, an environment heat exchange model, a water jacket heat exchange model and a combustion chamber heat exchange model.
6. The method of analyzing thermal properties of an automobile of claim 1, wherein the lubrication system heat transfer model comprises: the engine oil pump heat transfer model, the oil pan heat transfer model, the crankshaft heat transfer model, the camshaft heat transfer model and the piston heat transfer model.
7. The method of analyzing thermal properties of a vehicle of claim 1, wherein the cooling system heat exchange model comprises: the heat exchange device comprises an air inlet heat exchange model, a cooling pump heat exchange model, a warm air core body heat exchange model and an air blower heat exchange model.
8. The method of analyzing thermal properties of an automobile of claim 1, wherein the passenger compartment heat exchange model comprises: the heat exchange device comprises an instrument board heat exchange model, a passenger heat exchange model, a seat heat exchange model, a passenger cabin shell heat exchange model and a solar thermal radiation heat exchange model.
9. An analysis system for thermal properties of a vehicle, comprising:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring engine oil flow data, combustion chamber temperature data, combustion chamber exhaust flow data, water jacket heat transfer data, cooling liquid flow data, vehicle front end air intake data, passenger compartment model data and passenger compartment temperature data;
the combustion chamber modeling unit is used for establishing a combustion heat transfer model according to the combustion chamber temperature data, the water jacket heat transfer data and the combustion chamber exhaust flow data, wherein a heat source in the combustion heat transfer model is mainly the in-cylinder combustion temperature which is transmitted to the engine water jacket and the oil duct through the cylinder body metal structure, so that the heat is transmitted to a cooling system and a lubricating system, the boundary of the combustion heat transfer model is the combustion chamber temperature, the exhaust flow, an engine digital model, the engine material attribute and the water jacket characteristic data, the combustion chamber temperature is the heat source, the exhaust flow determines the heat transmitted to the cooling liquid by high-temperature gas at an exhaust manifold, the engine digital model and the material attribute determine a heat transmission path, and the water jacket characteristic determines the size of the heat transmitted to the cooling liquid through the water jacket;
the lubricating system modeling unit is used for establishing a lubricating system heat transfer model according to the engine oil flow data, the combustion chamber temperature data and the combustion chamber exhaust flow data, wherein an engine oil flow MAP (MAP), a combustion chamber temperature, an engine digital model and a material attribute combustion chamber temperature are heat source boundaries in the lubricating system heat transfer model, and the engine digital model and the material attribute define a heat path for transferring the combustion chamber temperature to a lubricating system;
the cooling system modeling unit is used for establishing a cooling system heat exchange model according to the water jacket heat transfer data, the cooling liquid flow data and the vehicle front end air intake data, and the boundary of the cooling system heat exchange model is cooling liquid flow distribution data and sending cabin front end module air intake data, wherein the cooling liquid flow distribution determines the flow distribution condition of each branch of the system, and the sending cabin front end module air intake data determines the air volume data of the radiator;
the passenger cabin modeling unit is used for establishing a passenger cabin heat exchange model according to the passenger cabin model data and the passenger cabin temperature data, the boundary of the passenger cabin heat exchange model is a passenger cabin digital model and material attributes, and the model mainly obtains the space of the passenger cabin, the gas circulation path, the heat dissipation condition to the environment and the heat absorption condition of each part of the passenger cabin according to the digital model and the material attributes;
and the test unit is used for carrying out temperature rise calculation on the whole vehicle in the environmental chamber through the combustion heat transfer model, the lubricating system heat transfer model, the cooling system heat exchange model and the passenger compartment heat exchange model.
10. The system for analyzing thermal properties of an automobile of claim 9, further comprising:
the first judgment unit is used for acquiring the temperature rise time of the combustion chamber, the cooling system, the lubricating system and the passenger compartment under each working condition through temperature rise calculation, and determining that the thermal performance of the vehicle is unqualified when the temperature rise time is greater than a set time threshold;
the second judgment unit is used for acquiring water temperature data of the cooling system through temperature rise calculation, comparing the water temperature data with environmental chamber test data, and determining that the analysis model is effective and the cooling system is qualified in heat exchange when the difference value of the water temperature data and the environmental chamber test data is smaller than a first threshold value;
and the third judgment unit is used for acquiring air temperature data of the passenger cabin through temperature rise calculation, comparing the air temperature data with environmental cabin test data, and determining that the analysis model is effective and the heat exchange of the passenger cabin is qualified when the difference value of the air temperature data and the environmental cabin test data is smaller than a second threshold value.
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| CN202483667U (en) * | 2012-02-28 | 2012-10-10 | 浙江吉利汽车研究院有限公司 | Engine timing chain lubricating oil circuit |
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