CN102663146A - Method for solving excessive surface temperature problem of automobile fuel tank - Google Patents
Method for solving excessive surface temperature problem of automobile fuel tank Download PDFInfo
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- CN102663146A CN102663146A CN2012100471848A CN201210047184A CN102663146A CN 102663146 A CN102663146 A CN 102663146A CN 2012100471848 A CN2012100471848 A CN 2012100471848A CN 201210047184 A CN201210047184 A CN 201210047184A CN 102663146 A CN102663146 A CN 102663146A
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- surface temperature
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Abstract
The invention provides a method for solving excessive surface temperature problem of an automobile fuel tank, and pertains to the field of the vehicle technology. The method solves problems that existing methods for solving the excessive surface temperature problem of the automobile fuel tank cannot be completely solved and the performance difference in each product is caused.The method for solving the excessive surface temperature problem of the automobile fuel tank comprises the steps of: analysis model building, heat protection analysis, heat insulation board design, and heat insulation board adjustment. The method for solving the excessive surface temperature problem of the automobile fuel tank performs optimization on the oil tank by adopting the method in an early stage of product development, so that obtained insulation board size and position are conform to reality, and actual use requirements are satisfied. By adopting the method, advantages of flexible usage, low production cost, high efficiency and wide application range, etc. are also achieved, and not only waste caused by sticking an insulation board in a dead region is avoided, but also the production cost is effectively controlled and product quality is guaranteed.
Description
Technical field
The invention belongs to the vehicle technology field, relate to automotive oil tank, particularly a kind of too high method of automotive oil tank surface temperature that solves.
Background technology
Automobile has been meant self equips power-actuated vehicle.Along with rapid development of automobile industry, automobile is more and more universal, and the vehicle of automobile is also more and more.Fuel tank and gas outlet are one of indispensable parts of automobile, and gas outlet is arranged in the close together of automobile bottom and part section and fuel tank, and the deployment scenarios of gas outlet can directly influence the tank surface temperature like this.The tank surface temperature is high more, and the fuel oil volatilization is serious more.When tank pressure surpasses limit value, the steam valve on the fuel tank cap will be opened automatically, keep the normal pressure in the fuel tank through discharging gasoline vapor.If it is higher that the temperature of fuel tank continues, can cause the frequent switch of steam valve, increase the possibility of its inefficacy.
The method that solves the problems of the technologies described above at present is by rule of thumb at the tank surface thermal insulation board that is sticked; Operation exists following defective like this: 1, at the tank surface thermal insulation board that is sticked in large area; Though can guarantee that like this tank surface temperature meets request for utilization; But exist the waste thermal insulation board, the problem that production cost increases; 2, rule of thumb make the thermal insulation board of suitable size and thickness and being sticked at tank surface; Operation can exist that thermal insulation board is big inadequately, thickness is blocked up, the position that is sticked is inaccurate like this; And cause fuel tank local surfaces temperature still can not meet request for utilization, promptly can not thoroughly solve the problem of existence and can produce the situation that each performance of products differs.
Summary of the invention
The objective of the invention is to have the problems referred to above, proposed a kind of product quality and production cost taken into account, evade the too high method of solution automotive oil tank surface temperature of the too high problem of tank surface temperature in design early stage to existing technology.
The object of the invention can be realized through following technical proposal: a kind of too high method of automotive oil tank surface temperature that solves is characterized in that this method comprises the following steps:
A, build analytical model: select building that floor assembly before and after comprising, exhaust system assembly and tank assembly carry out that the fuel tank solar heat protection analyzes for use;
B, solar heat protection analysis: set a speed of a motor vehicle as the starting condition of analyzing, the environment temperature under the prescribed limit operating mode, exhaust system, fuel system, front and back floor surface temperature and heat radiation parameter are carried out the fuel tank solar heat protection and are analyzed;
C, thermal insulation board design: through analysis result, find out the too high zone of tank surface temperature, near the too high zone of temperature, carry out the thermal insulation board design;
The adjustment of D, thermal insulation board: with the thermal insulation board that designs, merge with the steps A operation again, repeat above-mentioned steps B and C, obtain analysis result once more, thermal insulation board is carried out size, thickness and position adjustment, obtain the final optimization pass result according to analysis result.
Just adopt this method fuel tank is carried out solar heat protection analysis, thermal insulation board design and to be optimized in product development early stage, promptly just can evade the too high problem of tank surface temperature early stage in design.When building model and analyzing flow field, the Temperature Distribution situation of fuel system are simulated, analog result is near legitimate reading.According to analog result; Design and arrange fuel tank and the size and location of the gas outlet periphery thermal insulation board actual conditions of more fitting; Make through analysis, design and the thermal insulation board size to fit after optimizing, it is accurate in the position of tank surface to be sticked, and satisfies actual request for utilization; Can effectively avoid being sticked thermal insulation board and the waste that causes, control production cost and the quality that has guaranteed product effectively in inactive area.
In the too high method of above-mentioned solution automotive oil tank surface temperature, to build be the general arrangement parameter of choosing under the car load full load condition to model in the described steps A.Request for utilization when the result who adopts the ultimate value design to obtain can guarantee promptly that automobile is not in ultimate limit state has guaranteed the quality of product thus.
In the too high method of above-mentioned solution automotive oil tank surface temperature, model is built in pre-processing software in the described steps A, and the model of putting up is carried out the veil lattice divide.It is flexible to adopt pre-processing software to build to have adjustment to build model, builds the high advantage of model efficiency, can in time adjust thermal insulation board size, thickness and position according to analysis result, rapid adjustment and replacement analysis model; Adopt pre-processing software to handle simultaneously and make this method be more suitable for using, have the wide advantage of applicability in different vehicles.
In the too high method of above-mentioned solution automotive oil tank surface temperature, described veil lattice are divided triangular in shape, and the bond length of each triangular element of dividing of veil lattice all is not less than 1mm.Above-mentioned requirements has the veil lattice and divides the easier while and can access with former geometric model is more fitted and be applicable to the model that fluid analysis requires.
In the too high method of above-mentioned solution automotive oil tank surface temperature, described pre-processing software is HyperWorks or ANSA.
In the too high method of above-mentioned solution automotive oil tank surface temperature, described step B solar heat protection is analyzed and in fluid analysis software, is carried out; And adopt the steady-state analysis algorithm, choose temperature field analysis model and Emanations Analysis model.Have required physical model in the fluid analysis software, the solar heat protection analysis adopts fluid analysis software to have parameter and constant is set flexibly and computing velocity is fast, but also can select required algorithm and analytical model according to actual conditions.
In the too high method of above-mentioned solution automotive oil tank surface temperature, described fluid analysis software is STARCCM+, FLUENT, Sc/Tetra or CFX.
In the too high method of above-mentioned solution automotive oil tank surface temperature, ready-portioned described veil lattice model imported carry out volume mesh in the fluid analysis software and divide, and adopt hexahedron and cutting body unit.
In the too high method of above-mentioned solution automotive oil tank surface temperature, take the second gear climbing speed of a motor vehicle among the described step B as the starting condition of analyzing.
In the too high method of above-mentioned solution automotive oil tank surface temperature, the described second gear climbing speed of a motor vehicle is 30Km/h～40Km/h.
Compared with prior art, the too high method of this solution automotive oil tank surface temperature has the following advantages:
1, just adopt this method fuel tank is carried out solar heat protection analysis, thermal insulation board design and to be optimized in product development early stage, and then the size and location of the thermal insulation board that the obtains actual conditions of more fitting, satisfy actual request for utilization.
2, build analytical model and adopt the general arrangement parameter under the car load full load condition; Solar heat protection is analyzed and is taked the second gear climbing speed of a motor vehicle as the starting condition of analyzing; Selected parameter and starting condition are ultimate value, and the result who obtains so just can satisfy automobile and be in the request for utilization under the different conditions.
3, build analytical model and solar heat protection and analyze and all to adopt corresponding professional software to handle, therefore have use flexibly, cost is low, efficient is high and advantage such as applied widely.
4, the fuel tank that adopts this method to handle satisfies actual request for utilization fully, can effectively avoid simultaneously being sticked thermal insulation board and the waste that causes in inactive area, has controlled production cost and the quality that has guaranteed product effectively.
Description of drawings
Fig. 1 builds the illustraton of model that obtains in the analytical model step among the present invention.
Fig. 2 builds the partial model figure after the division of veil lattice in the analytical model step among the present invention.
Fig. 3 is the partial model figure after volume mesh is divided in the solar heat protection analytical procedure among the present invention.
Fig. 4 obtains tank surface state of temperature synoptic diagram in the solar heat protection analytical procedure among the present invention.
Fig. 5 is the synoptic diagram that obtains thermal insulation board and fuel tank among the present invention in the thermal insulation board design procedure.
Fig. 6 obtains tank surface state of temperature synoptic diagram in the set-up procedure of thermal insulation board among the present invention.
Embodiment
Below be specific embodiment of the present invention and combine accompanying drawing, technical scheme of the present invention is done further to describe, but the present invention is not limited to these embodiment.
To shown in Figure 6, the too high method of this solution automotive oil tank surface temperature comprises four steps of adjustment of building analytical model, solar heat protection analysis, thermal insulation board design and thermal insulation board like Fig. 1.
Building analytical model is to select for use to comprise that front and back floor assembly, exhaust system assembly, tank assembly carry out building of fuel tank solar heat protection analysis in pre-processing software; And the model of putting up is carried out the veil lattice to be divided; It is triangular in shape that the veil lattice are divided, and the bond length of each triangular element of dividing of veil lattice all is not less than 1mm.It is the general arrangement parameter of choosing under the car load full load condition that model is built, like ground elevation, minimum ground clearance etc.
Front and back floor assembly, exhaust system assembly, tank assembly are the fixed model of exploitation vehicle.Pre-processing software is HyperWorks or ANSA.The pre-processing software that present embodiment provides is HyperWorks.
Solar heat protection is analyzed and in fluid analysis software, is carried out, and has physical model in the fluid analysis software.Have more, fluid analysis software is STARCCM+, FLUENT, Sc/Tetra or CFX.The fluid analysis software that present embodiment provides is STARCCM+, and physical model adopts standard k-ε model, wherein
The k equation:
The ε equation:
In the formula
The turbulence viscosity, mu
tCan be expressed as the function of k and ε, that is:
In standard k-ε model, model constants C
1 ε, C
2 ε, C
μ, σ
k,
Value be: C
1 ε=1.44, C
2 ε=1.92, C
μ=0.09, σ
k=1.0,
Divide carrying out volume mesh in the ready-portioned above-mentioned veil lattice model importing fluid analysis software, and adopt hexahedron and cutting body unit.Then, adopt the steady-state analysis algorithm, choose temperature field analysis model and Emanations Analysis model.At last, take the second gear climbing speed of a motor vehicle as the starting condition of analyzing; Environment temperature under the prescribed limit operating mode, exhaust system, fuel system, front and back floor surface temperature and heat radiation parameter are carried out the fuel tank solar heat protection and are analyzed.The above-mentioned second gear climbing speed of a motor vehicle is 30Km/h～40Km/h; The second gear climbing speed of a motor vehicle that present embodiment provides is 34.4Km/h, can also select 30Km/h, 37Km/h or 40Km/h according to the actual conditions second gear climbing speed of a motor vehicle.
The thermal insulation board design is the result who obtains through the solar heat protection analysis, finds out the too high zone of tank surface temperature, near the too high zone of temperature, carries out the thermal insulation board design.The too high zone of above-mentioned tank surface temperature is meant that the tank surface temperature surpasses 60 °～75 ° zones, and the temperature value that present embodiment provides is 70 °; Can also be 60 ° or 75 ° according to the actual conditions temperature value.
The adjustment of thermal insulation board is with the thermal insulation board that designs; Again with build the analytical model procedure and merge, repeat above-mentioned solar heat protection analytical procedure and thermal insulation board design procedure, obtain analysis result once more; According to analysis result thermal insulation board is carried out size, thickness and position adjustment, obtain the final optimization pass result.
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used terms such as building analytical model, solar heat protection analysis, thermal insulation board design and thermal insulation board morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; It all is contrary with spirit of the present invention being construed to any additional restriction to them.
Claims (10)
1. one kind solves the too high method of automotive oil tank surface temperature, it is characterized in that this method comprises the following steps:
A, build analytical model: select building that floor assembly before and after comprising, exhaust system assembly, tank assembly carry out that the fuel tank solar heat protection analyzes for use;
B, solar heat protection analysis: set a speed of a motor vehicle as the starting condition of analyzing, the environment temperature under the prescribed limit operating mode, exhaust system, fuel system and front and back floor surface temperature and heat radiation parameter are carried out the fuel tank solar heat protection and are analyzed;
C, thermal insulation board design: through analysis result, find out the too high zone of tank surface temperature, near the too high zone of temperature, carry out the thermal insulation board design;
The adjustment of D, thermal insulation board: with the thermal insulation board that designs, merge with the steps A operation again, repeat above-mentioned steps B and C, obtain analysis result once more, thermal insulation board is carried out size, thickness and position adjustment, obtain the final optimization pass result according to analysis result.
2. the too high method of solution automotive oil tank surface temperature according to claim 1 is characterized in that, to build be the general arrangement parameter of choosing under the car load full load condition to model in the described steps A.
3. the too high method of solution automotive oil tank surface temperature according to claim 1 is characterized in that model is built in the described steps A in pre-processing software, and the model of putting up is carried out the veil lattice divide.
4. the too high method of solution automotive oil tank surface temperature according to claim 3 is characterized in that, described veil lattice are divided triangular in shape, and the bond length of each triangular element of dividing of veil lattice all is not less than 1mm.
5. according to claim 3 or the too high method of 4 described solution automotive oil tank surface temperatures, it is characterized in that described pre-processing software is HyperWorks or ANSA.
6. according to any too high method of described solution automotive oil tank surface temperature in the claim 1 to 4, it is characterized in that described step B solar heat protection is analyzed and in fluid analysis software, carried out; And adopt the steady-state analysis algorithm, choose temperature field analysis model and Emanations Analysis model.
7. the too high method of solution automotive oil tank surface temperature according to claim 6 is characterized in that described fluid analysis software is STARCCM+, FLUENT, Sc/Tetra or CFX.
8. the too high method of solution automotive oil tank surface temperature according to claim 6 is characterized in that, described ready-portioned described veil lattice model is imported carried out the volume mesh division in the fluid analysis software, and adopts hexahedron and cutting body unit.
9. the too high method of solution automotive oil tank surface temperature according to claim 6 is characterized in that, takes the second gear climbing speed of a motor vehicle as the starting condition of analyzing among the described step B.
10. the too high method of solution automotive oil tank surface temperature according to claim 9 is characterized in that, the described second gear climbing speed of a motor vehicle is 30Km/h～40Km/h.
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| CN2651905Y (en) * | 2003-08-19 | 2004-10-27 | 特变电工衡阳变压器有限公司 | Heat-proof structure of duct oil tank |
| CN102034006A (en) * | 2010-12-16 | 2011-04-27 | 上海奕洁汽车科技有限公司 | Finite element method-based storage battery thermal management analysis and optimization method |
| CN102358174A (en) * | 2011-07-29 | 2012-02-22 | 曾文书 | Multifunctional heat-proof oil tank |
-
2012
- 2012-02-28 CN CN2012100471848A patent/CN102663146A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2651905Y (en) * | 2003-08-19 | 2004-10-27 | 特变电工衡阳变压器有限公司 | Heat-proof structure of duct oil tank |
| CN102034006A (en) * | 2010-12-16 | 2011-04-27 | 上海奕洁汽车科技有限公司 | Finite element method-based storage battery thermal management analysis and optimization method |
| CN102358174A (en) * | 2011-07-29 | 2012-02-22 | 曾文书 | Multifunctional heat-proof oil tank |
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| 刘斌，等。: "柴油机排气管恒温进气的内流场数值模拟", 《杭州电子科技大学学报》 * |
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Application publication date: 20120912 |