JP2008243063A - Design support system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a design support technique capable of executing a component layout appropriate of the heat-resistant temperature of a component and of the heat insulation countermeasure thereof after comprehending a temperature distribution around a heat source. <P>SOLUTION: The design support system for laying out components around a heat source to be loaded on a vehicle generates body model data around an exhaust pipe in S1, sets a surface temperature of the exhaust pipe and the existence/absence of an insulator in S2, calculates atmospheric temperature around the exhaust pipe in accordance with a distance to the exhaust pipe in S3 to S5, and displays a temperature distribution around the exhaust pipe along with the components around the exhaust pipe by isothermal lines on the basis of the atmospheric temperature in S6 to S10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a design support technology for laying out components around a heat source such as an exhaust pipe mounted on a vehicle.

As a conventional vehicle design support system, Patent Document 1 describes a technique for setting the surface color of an air cleaner disposed near an exhaust pipe to a color with low heat radiation. Patent Document 2 describes a heat shielding material for exhaust system parts.
JP 2004-124922 A Japanese Patent Laid-Open No. 08-169244

  However, in the above prior art, when a heat shielding material is applied to an exhaust system component, the temperature distribution around the exhaust system component is not taken into consideration, and the heat resistant temperature of the component against the actual temperature distribution and appropriate heat shielding measures are taken. It has not been fully examined.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to realize a design support technology capable of implementing a component layout in which the heat-resistant temperature of the component and heat shielding measures are appropriate after grasping the temperature distribution around the heat source. It is to be.

  In order to solve the above-described problems and achieve the object, according to a first embodiment of the present invention, there is provided a design support system for laying out components around a heat source mounted on a vehicle, wherein the temperature of the heat source is set. A heat source temperature setting means for setting; an atmosphere temperature calculating means for calculating an ambient temperature around the heat source according to a distance from the heat source; and a temperature distribution around the heat source together with components around the heat source based on the ambient temperature. Display means for displaying by means of isothermal lines. According to the first embodiment, after grasping the temperature distribution around the heat source, it is possible to implement a component layout in which the heat resistant temperature of the component and the heat shielding measures are appropriate.

  The second aspect of the present invention further includes a heat-resistant temperature setting means for setting a heat-resistant temperature of the component, and the display means identifies a component arranged in a region above the set heat-resistant temperature. Display as possible. According to the 2nd form, the components which need a layout change can be grasped | ascertained around a heat source.

  Moreover, the 3rd form which concerns on this invention further has a heat-resistant temperature setting means to set the heat-resistant temperature of the said component, and the said display means makes the area | region which does not exceed the heat-resistant temperature of a component the area | region which can arrange | position the said component. Display identifiable. According to the third embodiment, the component layout with respect to the periphery of the heat source can be determined so as to satisfy the heat-resistant temperature of the component.

  According to a fourth aspect of the present invention, the heat source is an exhaust pipe disposed at a lower part of a vehicle body, and the display means displays a region having an isothermal line above the exhaust pipe as a boundary in a wider range from below. To do. According to the fourth embodiment, since the isothermal region above the heat source where heat is likely to stay and become high temperature is set to a wider range than the lower part of the heat source, the component layout based on the isothermal region conforming to the actual temperature distribution around the heat source Can be implemented.

  According to a fifth aspect of the present invention, the ambient temperature calculation means calculates the ambient temperature in a state where a heat shield is provided in either the heat source or the component. According to the fifth embodiment, it is possible to implement a component layout in consideration of the presence or absence of a heat shield measure.

  The present invention can also be applied to a program for causing a computer to implement the functions of the respective means of the design support system and a computer-readable storage medium storing the program.

  According to the present invention, it is possible to implement a component layout in which the heat resistance temperature of the components and the heat shielding measures are appropriate after grasping the temperature distribution around the heat source such as the exhaust pipe.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  The embodiment described below is an example as means for realizing the present invention, and the present invention can be applied to a modified or modified embodiment described below without departing from the spirit of the present invention.

[System configuration]
FIG. 1 is an external view (a) and a block diagram (b) illustrating the hardware configuration of the design support system according to the embodiment of the present invention.

  In FIG. 1, an input device including a keyboard 2 and a mouse 3, a display device 4 including a liquid crystal display (LCD) panel, and an auxiliary storage device 5 including a hard disk (HDD) are connected to the computer main body 1. The computer main body 1 includes a CPU that executes arithmetic processing, a ROM that stores a program for executing component layout optimization processing (hereinafter, component layout optimization processing) based on a temperature distribution around a heat source, which will be described later, and temporary storage of data And a RAM as a work area, and an I / O circuit for executing data exchange with the peripheral devices 2 to 5. Three-dimensional CAD data (hereinafter also simply referred to as CAD data) is input by the user via the input devices 2 and 3 and the display device 4 and stored in the auxiliary storage device 5. The computer main body 1 writes the CAD data in the RAM by a user operation input, and executes a component layout optimization process. In this component layout optimization process, image data around the heat source of the vehicle (exhaust system components such as exhaust pipes and internal combustion engines such as engines) is displayed on the display device 4 together with the temperature distribution (isothermal lines). If a printer is connected to the computer main body 1, the image data can be printed out.

[Part layout optimization processing]
FIG. 2 is a flowchart showing component layout optimization processing by the design support system shown in FIG. 3 is a view showing model data of the lower part of the vehicle body, FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3, and FIG. 5 is a cross-sectional view taken along B- in FIG. B sectional view, FIG. 6 is a CC sectional view (a) and a three-dimensional view (b) of FIG. 3, and FIG. 7 is a DD sectional view of FIG.

  In FIG. 2, first, the computer main body 1 reads CAD data from the auxiliary storage device 5 and creates vehicle body model data in which parts around the exhaust pipe as a heat source are laid out according to a predetermined design rule (S1). Here, as shown in FIGS. 3 to 7, the vehicle body model data includes an exhaust pipe extending in the longitudinal direction of the vehicle body at the lower part of the vehicle body, and a catalyst, an insulator, an outer panel, an inner panel, a floor mat, It consists of shape data of each part such as fuel pipe, fuel tank, silencer and so on. In addition, since the heat insulating material (insulator) which interrupts | blocks heat differs in the surface temperature of an exhaust pipe according to a vehicle model etc., it selectively arrange | positions as needed at the components side or the exhaust pipe side.

  Next, the computer main body 1 sets the surface temperature of the exhaust pipe and the presence / absence of an insulator (S2). Here, as illustrated in FIG. 10, the surface temperature of the exhaust pipe is set in a range of 400 to 800 ° C. according to the vehicle type. Each surface temperature is set immediately after climbing a steep slope. The maximum temperature is reached as in the case of stopping. Here, the surface temperature of the exhaust pipe may be set according to the running state, the fuel injection amount, the ignition timing, etc. in addition to the vehicle type. Insulators are also laid out with respect to parts or exhaust pipes. The exhaust pipe surface temperature and the presence or absence of the insulator can be set by the user via a UI (user interface) screen displayed on the input devices 2 and 3 and the display device 4.

  Next, the computer main unit 1 refers to the temperature map representing the relationship between the exhaust pipe surface temperature and the presence or absence of the insulator set in S2 and the temperature at each measurement point around the exhaust pipe measured in advance through experiments or the like. Then, the temperature data at each measurement point of the vehicle body model data created in S1 is read from the auxiliary storage device 5 (S3). Here, as shown in FIGS. 3 to 7, the temperature map sets a plurality of (for example, four) cut surfaces A to D parallel to the vehicle width direction with respect to the actual vehicle, and on these cut surfaces. Thermocouples are arranged at a plurality of measurement points PA1 to PA5, PB1 to PB8, PC1 to PC6, and PD1 to PD3 corresponding to the respective parts at the lower part of the vehicle body, and temperature measurement results and exhaust pipe surface temperatures at each measurement point Is required by the relationship.

  Next, the computer main body 1 calculates a functional expression representing the ambient temperature around the exhaust pipe according to the distance from the exhaust pipe from the temperature data of each measurement point read out in S3 (S4). Here, as illustrated in FIG. 8, the above-described function equation plots the temperature data (PB1 to PB8) of each measurement point read in S3 on a graph, and according to the distance from the exhaust pipe, Functions (approximate curves) TA and TB that minimize the error are calculated for each of the upper and lower measurement points.

  In the example of FIG. 8, an approximate curve TA, for example, TA = A0 × exp (−A1 × L) + T0 is obtained for the measurement point (PB1, PB5, PB6) above the exhaust pipe. Similarly, an approximate curve TB, for example, TB = A0 × exp (−A2 × L) + T0 is obtained for the measurement points (PB2, PB3, PB4, PB7, PB8) below the exhaust pipe.

Where TA, TB: temperature at a distance L from the exhaust pipe, A0: constant determined by the exhaust pipe surface temperature, A1, A2: constant that minimizes the error for each measurement point, T0: constant determined by the outside air temperature and The computer main body 1 calculates the predicted temperature at each measurement point using the function obtained in S4 (S5).

  Next, the computer main body 1 creates an isotherm representing the temperature distribution around the exhaust pipe according to the predicted temperature of each measurement point calculated in S5 and the distance from the exhaust pipe (S6). Here, as illustrated in FIGS. 4 to 7, the isothermal lines T270, T200, and T130 of 270 ° C., 200 ° C., and 130 ° C. are arranged in order from the exhaust pipe to the vehicle body model data created in S1. Create the set data. In this embodiment, 130 ° C. is the upper limit value for compensating the performance of the brake component and fuel supply component, 200 ° C. is the upper limit value of the melting temperature of the resin material, and 270 ° C. is the upper limit of the fuming temperature of the hose and rubbers. Each is set as a value.

  Next, the computer main body 1 compares the heat-resistant temperature TC of each part around the exhaust pipe with the ambient temperature T1 in the region where the part is arranged (S7). The heat-resistant temperature TC of each component can be input by the user via the UI screen displayed on the input devices 2 and 3 and the display device 4 in S2.

  Then, when the heat-resistant temperature TC of each part is lower than the ambient temperature T1 of the region, the computer main body 1 includes an image in which isothermal lines are set in the vehicle body model data (see FIGS. 9 and 11) and A warning display for notifying that the layout is not appropriate and needs to be changed is output to the display device 4 so that the component can be identified (S8, see FIG. 10). Here, for example, as shown in FIG. 10C, when a fuel pipe having a heat-resistant temperature of 120 ° C. is arranged on the exhaust pipe side from the 130 ° C. isothermal line, Change color and display. In FIG. 10, the exhaust pipe surface temperature, the predicted part temperature range, the distance from the exhaust pipe, and the presence / absence of an insulator are displayed at the same time. As a result, it is possible to grasp parts that require layout change around the exhaust pipe. In addition, it is possible to implement a component layout that takes into account the presence or absence of heat shield measures.

  Further, the computer main body 1 recreates vehicle body model data in which the layout of the inappropriate parts is changed to an appropriate position, and outputs the data to the display device 4 (S9).

  Further, when the heat-resistant temperature TC of each part is equal to or higher than the ambient temperature T1 of the area, the computer main body 1 displays an area that does not exceed the heat-resistant temperature of the part as a layoutable area (S10, FIG. 9). FIG. 11). Thereby, the component layout with respect to the periphery of the exhaust pipe can be determined so as to satisfy the heat-resistant temperature of the component.

  Thus, by displaying the isothermal line superimposed on the vehicle body model data, the user can identify the temperature distribution around the exhaust pipe with the isothermal line as the boundary line.

  In S6, the region with the isothermal line obtained from the function equation TA above the exhaust pipe in FIG. 8 as a boundary is created and displayed so as to be wider than the function equation TB below the exhaust pipe (FIG. 9). And FIG. 11). As a result, the region with the boundary of the isothermal line above the exhaust pipe, where heat is likely to stay and become hot, is set to be wider than the lower part of the exhaust pipe, so the component layout in line with the actual temperature distribution around the exhaust pipe Can be implemented.

  Note that a storage medium storing a computer program for executing the component layout optimization processing by the design support system described above is supplied to the computer main body, and the computer main body reads out the program code stored in the storage medium, You may make it perform the said process.

1A and 1B are an external view and a block diagram illustrating a hardware configuration of a design support system according to an embodiment of the present invention. It is a flowchart which shows the components layout optimization process by the design support system shown in FIG. It is a figure which illustrates the model data of the vehicle body lower part. It is AA sectional drawing of FIG. FIG. 4 is a cross-sectional view taken along the line B-B in FIG. 3 when the insulator is present (a) and when the insulator is not present (b). It is CC sectional drawing (a) and solid figure (b) of FIG. It is DD sectional drawing of FIG. It is a figure explaining the calculation process of the function type | formula in S4 of FIG. It is a figure which shows the example of a display of the area | region below an exhaust pipe in the case of 270 degreeC in S6 of FIG. 2 (a), the case of 200 degreeC (b), and the case of 130 degreeC (c) at the boundary of each isothermal line. . It is a figure which shows numerically the relationship between the exhaust pipe surface temperature for every vehicle model, and component temperature in each area | region which used the isothermal line of FIG. 9 as a boundary. It is a figure which shows the example of a display of the area | region above an exhaust pipe in the case of 270 degreeC in S6 of FIG. 2 (a), the case of 200 degreeC (b), and the case of 130 degreeC (c). .

Explanation of symbols

1 Computer body 2, 3 Input device 4 Display device 5 Auxiliary storage device

Claims (5)

A design support system for laying out parts around a heat source mounted on a vehicle,
Heat source temperature setting means for setting the temperature of the heat source;
Atmosphere temperature calculating means for calculating the ambient temperature around the heat source according to the distance from the heat source;
And a display means for displaying a temperature distribution around the heat source with isothermal lines together with components around the heat source based on the ambient temperature. It further has heat resistant temperature setting means for setting the heat resistant temperature of the component,
The system according to claim 1, wherein the display unit displays a component arranged in a region having a temperature higher than a set heat-resistant temperature so that the component can be identified. It further has heat resistant temperature setting means for setting the heat resistant temperature of the component,
The system according to claim 1, wherein the display unit displays an area that does not exceed a heat-resistant temperature of a part so as to be identifiable as an area where the part can be arranged. The heat source is an exhaust pipe disposed at the lower part of the vehicle body,
2. The system according to claim 1, wherein the display unit displays a region having an isothermal line above the exhaust pipe as a boundary from a lower range.   The system according to claim 1, wherein the ambient temperature calculation unit calculates the ambient temperature in a state where a heat shielding material is provided in either the heat source or the component.