JP4314470B2 - Dust proof test method and apparatus - Google Patents

Description

  The present invention relates to a dustproof test method and apparatus used for confirming the dustproof performance of a vehicle.

Automakers generally evaluate vehicle performance at the product development stage to determine design requirements that guarantee performance for a wide variety of vehicle usage environments on the market. As an example of the vehicle usage environment that is a target of performance evaluation of such a vehicle, there is a driving environment (multi-dust road driving environment) on a road (so-called multi-dust road) in which dust flies into the atmosphere as it travels. .
And in a multi-dusty road environment, for example, the state of dust entering the engine room and the passenger compartment of the vehicle is reproduced, the reproduced data is reflected in the design, and used for the development of a vehicle with good dust resistance. Yes.

As an example of an apparatus that reproduces an environment in which dust as described above flies in the atmosphere, there is a test apparatus disclosed in Patent Document 1.
In the test apparatus shown in Patent Document 1, a charged / magnetized sample stage 3 is installed at the center of the test tank 1, a circulation blower 2 is installed just below the charged / magnetized specimen stage 3, and pollutants are released from the dust generator 4. The tube 6 passes through the wall of the test chamber 1 and is placed on the front surface of the circulating fan 2, and the sample 5 is placed on the charged / magnetized sample stage 3, and the sample is charged or magnetized to remove contaminants. I try to force adhesion.

By the way, the vehicle is susceptible to dust entry due to the influence of the traveling wind. For this reason, when conducting a test for evaluating dustproof performance, an environment in which traveling wind is taken into consideration (that is, dust is simply flying in the atmosphere, or dust is simply circulating around the sample (vehicle). It is desirable to set an environment corresponding to a driving wind hitting the vehicle, not the state.
However, the test apparatus shown in Patent Document 1 only circulates an airflow in which pollutants float around a sample (vehicle), and does not have an environment in which traveling wind is taken into consideration. For this reason, as the traveling wind is not taken into consideration, the verification accuracy is low, and it is actually necessary to improve the dustproof performance for the vehicle.

In addition, in order to grasp the dust-proof performance of the vehicle described above, a test course that simulates the market environment (that is, considering the influence of driving wind) and assumes a multi-dust road is used, and the vehicle is driven on this test course. The test (hereinafter referred to as a test course actual traveling dustproof performance test) may be performed.
JP 10-38790 A

However, since the test course actual running dustproof performance test described above is an outdoor test, dust standing required as a test condition is easily affected by humidity and wind direction, and the test cannot be performed unless the weather conditions are satisfied. For this reason, the test schedule was influenced by the weather and was inconvenient.
In addition, the data obtained in the test course actual running dustproof performance test described above is subject to variations such as driving operations in addition to the variations in the dust standing condition, so the obtained test data varies widely, and the design requirements are determined. In fact, it was actually desired to improve accuracy.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a dustproof test method and apparatus capable of grasping the dustproof performance of a vehicle in consideration of the influence of traveling wind.

The dust-proof test device according to claim 1 is arranged in the test chamber and blows the dust from the dust supply device to the test vehicle, and is arranged in the test chamber and sandwiches the test vehicle. A dust circulation path for opening one end side facing the area facing the blower and opening the other end in the vicinity of the blower and guiding air containing dust from one end to the other end Control means for controlling the dust supply device and the blower based on dust supply conditions, the blower is an axial fan, and the axial fan is inserted through the central portion of the blade portion. The rotating shaft has a cylindrical shape, and the rotating shaft discharges dust supplied from the dust supply device .
Invention according to claim 2, in the dustproof test apparatus of claim 1, wherein the dust supply conditions, characterized in that it comprises wind speed, data relating to the particle size of the dust concentration and dust.
According to a third aspect of the present invention, in the dustproof test apparatus according to the first or second aspect , the dust supply condition is determined based on a dust standing state during actual traveling of the vehicle.

According to a fourth aspect of the present invention, there is provided a dustproof test method comprising: a blowing step of controlling the dust supply device and the blower device based on a predetermined dust supply condition to blow dust from the dust supply device to the test vehicle; the dust reaches the region opposed to the blower via a test vehicle with air, back into the vicinity of the blower, possess a circulating step of circulating the dust and air, the said blower, the axial The axial fan has a cylindrical rotating shaft that is inserted through the central portion of the blade portion, and the rotating shaft receives the dust supplied from the dust supply device and rotates the shaft to discharge the dust. A shaft passing step is included .
According to a fifth aspect of the present invention, in the dustproof test method according to the fourth aspect , the dust supply condition includes data relating to wind speed, dust concentration, and dust particle size.
According to a sixth aspect of the present invention, in the dustproof test method according to the fourth or fifth aspect , the dust supply condition is determined based on a dust standing state during actual traveling of the vehicle.

According to the first to sixth aspects of the present invention, the control means controls the dust supply device and the blower device based on a predetermined dust supply condition, and blows dust from the dust supply device to the test vehicle. The dust that has reached the region facing the air blower via the test vehicle is returned to the vicinity of the air blower together with the air, so that the multi-dust road traveling environment is reproduced in the test chamber. And because the test environment reproduces the multi-dust road driving environment without using the actual dust-proof performance test, the road condition and the driver's driving operation variation are eliminated, and the reproducibility of the multi-dust road driving environment is improved. It is possible to avoid the repeated test that can occur in the actual traveling dustproof performance test, thereby speeding up the product development. In addition, since it is possible to reproduce a multi-dusty road environment without being influenced by the weather, the initial test plan is not changed due to bad weather.
According to the first and fourth aspects of the invention, the axial fan has a cylindrical rotating shaft that is inserted through the central portion of the blade portion, and the rotating shaft is supplied from the dust supply device. Since dust is discharged, the stirring speed of dust can be increased, and the dust can be made uniform at an early stage.

Hereinafter, a dustproof test apparatus according to an embodiment of the present invention will be described with reference to FIGS.
1 and 2, the dustproof test device 10 is disposed in a dust circulation chamber 12 (test chamber) of a factory 11 and supplies dust 13, and is formed at a substantially central portion of the dust circulation chamber 12. An axial fan 17 (blower device) that blows dust 13 from the dust supply device 14 to the test vehicle 16 arranged in the test vehicle arrangement region 15 is provided. The dust supply device 14 can select a plurality of types of dust 13 having different diameters and supply the selected dust 13. The test vehicle 16 is arranged so that the front 16a side faces the axial fan 17, and the wind corresponding to the wind (running wind) received during traveling is obtained by blowing air from the axial fan 17 in a stopped state. It is like that.

  The dustproof test apparatus 10 further includes a dust circulation path 19 that is disposed on the ceiling 18 side of the dust circulation chamber 12 so as to extend along the front-rear direction (the left-right direction in FIG. 1A) of the test vehicle 16 and a predetermined amount. And a control device 20 for controlling the dust supply device 14 and the axial fan 17 based on the dust supply conditions. The dust supply condition is obtained based on the dust standing state obtained by actual traveling of the vehicle on a multi-dust road, and data (hereinafter referred to as data on wind speed (traveling wind speed), dust 13 concentration, and dust 13 particle size). , Respectively, wind speed data 21a, dust concentration data 21b, and particle size data 21c).

In the actual traveling of the vehicle on the multi-dust road, the wind speed, the concentration of dust 13 and the particle size of dust 13 change with time. In this embodiment, this change time (hereinafter referred to as time data). 21d) is included in the dust supply conditions. In this case, the time data 21d is associated with the wind speed data 21a, dust concentration data 21b, and particle size data 21c.
For example, the vehicle receives the dust 13 having the particle diameter k1 at the wind speed v1 over the time t1 in the state where the dust 13 has the concentration n1, and then the dust n concentration n2, the particle diameter k2, and the wind speed v2 are maintained over the time t2. When the state of the density 13 of the dust 13, the particle diameter k3 and the wind speed v3 is continued for a time t3, the time t1 is associated with the density n1 of the dust 13, the particle diameter k1 and the wind speed v1. The time t2 is associated with the density n2, the particle diameter k2, and the wind speed v2 of the dust 13, and the time t3 is associated with the density n3, the particle diameter k3, and the wind speed v3 of the dust 13.
The dust supply conditions (wind speed data 21a, dust concentration data 21b, particle size data 21c, and time data 21d) are stored in advance in the storage unit 22 described later, and are used to reproduce the multi-dust road traveling environment in the dust circulation chamber 12. It is like that.

  The dust circulation path 19 faces an area 23 (hereinafter referred to as a test vehicle rear side area for the sake of convenience) where one end side 19a faces the axial fan 17 with the test vehicle 16 in between, and the other end side 19b faces the shaft. It is arranged so as to face the vicinity of the flow fan 17 (the back side of the blower). The dust circulation path 19 guides the air containing the dust 13 passing through the test vehicle 16 by the blow of the axial fan 17 from the one end side 19a to the other end side 19b. The air circulation at can be performed efficiently.

  The dust supply device 14 is disposed in the vicinity of the other end 19 b of the dust circulation path 19 and supplies dust using dry air to the central portion of the rotating shaft 32 of the axial fan 17. A rectifying plate (hereinafter referred to as a first rectifying plate) 25 is disposed between the axial fan 17 and the test vehicle 16 so that the air blown from the axial fan 17 is sent to the test vehicle 16 satisfactorily. I have to. Further, a rectifying plate (hereinafter referred to as a second rectifying plate) 27 having a concave surface portion 26 is disposed in the rear region 23 of the test vehicle with the concave surface portion 26 facing the inside of the dust circulation chamber 12, and dust. The air containing the dust 13 in the circulation chamber 12 can be circulated efficiently. A dust concentration meter 30 for detecting the concentration of the dust 13 is disposed in the vicinity of the windshield 28 of the test vehicle 16. In the engine room 16b of the test vehicle 16, an air cleaner 16d provided with a filter 16c is arranged.

  The axial fan 17 rotates the rotation shaft 32 via a blade portion 31, a cylindrical rotation shaft 32 that is inserted into and supports the blade portion 31, and a bearing (hereinafter referred to as a first bearing) 33. And a motor 34 that supports the blade 31 and rotates the blade 31. The blade portion 31 includes a plurality of blades 35 and a cylindrical hub 36 that supports the plurality of blades 35. The rotating shaft 32 is inserted through the hub 36. In this case, the rotating shaft 32 is inserted such that the end surface 37a on one end side 37 coincides with one end surface of the hub 36 (hereinafter referred to as hub first end surface) 36a. That is, the rotating shaft 32 is inserted into the hub 36 in a state where one end side 37 of the rotating shaft 32 substantially avoids protruding from the hub first end surface 36a. An end surface of the hub 36 opposite to the hub first end surface 36a is referred to as a hub second end surface 36b. The rotary shaft 32 has a portion (hereinafter referred to as a rotary shaft main body) 38 connected to one end side 37 inserted through the hub 36 projecting from the hub second end surface 36 b, and the rotary shaft main body 38 rotates around the first bearing 33. It is supported movably.

  The rotation shaft main body 38 of the rotation shaft 32 is inserted with the other end side 40b of the dust supply pipe 40 whose one end side 40a is connected to the dust supply device 14. A bearing (hereinafter referred to as a second bearing) 41 is interposed between the dust supply pipe 40 and the rotary shaft 32 so as to allow the rotary shaft 32 to rotate with respect to the dust supply pipe 40.

  A control device 20 is connected to the dust supply device 14, the motor 34 of the axial fan 17, and the dust concentration meter 30. The control device 20 supplies the dust based on the above-described storage unit 22 that stores the dust supply conditions (wind speed data 21a, dust concentration data 21b, particle size data 21c, and time data 21d), and the dust supply conditions. And a controller (control means) 42 for controlling the motor 34 of the axial flow fan 17.

  The dust supply conditions (the wind speed data 21a, the dust concentration data 21b, the particle size data 21c, and the time data 21d) are obtained by measuring the dust standing state when the vehicle actually travels on a multi-dust road as described above. It is a thing. When measuring the dust standing state in actual traveling, wind speed detecting means that has rotating blades and a tachometer and detects the speed of the traveling wind (hereinafter referred to as wind speed) and time is detected. Data obtained by each of the detection means (determined in correspondence with time) using an image reading means for detecting the particle size of dust in correspondence with time from the data and a dust concentration meter for detecting dust concentration in correspondence with time. The dust supply conditions are obtained from the obtained wind speed data, dust concentration data, and particle size data. The dust supply condition is stored in the storage unit 22.

  The controller 42 generates a control signal 43 so as to meet the dust supply conditions, and outputs the control signal 43 to the dust supply device 14 and the axial fan 17 to control them. In this case, the detection data 44 of the dust concentration meter 30 is used as feedback control data (see step S13 in FIG. 5). The control signal 43 output to the axial fan 17 is determined based on the wind speed data 21a and time data 21d, and the control signal 43 output to the dust supply device 14 includes dust concentration data 21b, particle size data 21c and It is determined based on the time data 21d. For example, as shown in FIG. 1B, the control signal 43 output to the axial fan 17 has a size v0 corresponding to the wind speed data 21a and includes a time t0 corresponding to the time data 21d. ing.

The operation of the dustproof test apparatus 10 configured as described above will be described below with reference to FIGS.
In this dustproof test apparatus 10, as shown in FIG. 4, first, the test vehicle 16 is installed in the dust circulation chamber 12 (step S1). Next, the controller 42 provides dust supply conditions (the wind speed data 21a, dust concentration data 21b, particle size data 21c, and time data 21d) obtained by measuring the dust standing state during actual traveling and stored in the storage unit 22. Is read from the storage unit 22 (step S2).

  In step S3 following step S2, according to the dust supply conditions (the wind speed data 21a, the dust concentration data 21b, the particle size data 21c and the time data 21d), the rotational speed of the axial fan 17 and the corresponding particle size by the dust supply device 14 are determined. The selection of the dust 13 and the supply amount thereof are controlled, and the dust 13 is blown to the test vehicle 16 (blowing process). In step S3, the rotating shaft 32 receives the supply of the dust 13 from the dust supply device 14, discharges the dust 13 from one end side 37 of the rotating shaft 32 (rotating shaft passing step), and discharges the discharged dust 13 to the blade. While the unit 31 is stirring, the air containing the dust 13 which is sent to the test vehicle 16 side through the first rectifying plate 25 and passes through the test vehicle 16 by the blow of the axial fan 17 is passed through the dust circulation path 19 to the shaft. Returning to the flow fan 17 side, the dust 13 and air are circulated in the dust circulation chamber 12 (circulation step). Details of step S3 will be described later with reference to FIG.

  Next, it is determined whether or not the dust 13 is supplied to the test vehicle 16 in step S3 while satisfying all dust supply conditions. If it is determined that all dust supply conditions are satisfied, the axial fan 17 and The operation of the dust supply device 14 is stopped and the supply of the dust 13 to the test vehicle 16 is ended (step S4). In the subsequent step S5, the performance (the dustproof performance in the engine room 16b and the vehicle compartment 16e) related to traveling on a multi-dust road of the vehicle is confirmed (step S5). In step S5, the filter 16c of the air cleaner 16d disposed in the engine room 16b of the test vehicle 16 is removed, dust is dropped from the filter 16c, the weight is measured, and the dustproof performance of the engine room 16b is confirmed, or the vehicle compartment 16e is checked. Image data obtained by a dust concentration meter, camera photography, or the like installed inside is obtained, and the dustproof performance of the passenger compartment 16e is confirmed.

  In step S3, as shown in FIG. 5, rotation of the axial fan 17 (step S11) and supply of dust 13 by the dust supply device 14 (step S12) are sequentially performed. Next, it is determined whether or not the concentration of the dust 13 is compatible with the dust concentration data 21b of the dust supply condition (step S13). If it is determined No in step S13, the process returns to step S12. If it determines with Yes in step S13, the measurement of time (henceforth predetermined condition continuation time) is started (step S14). Then, it is determined whether or not the predetermined condition duration has reached the value of the time data 21d (whether the set time has ended) (step S15). For example, if the dust 13 having the particle size k1 is received at the wind speed v1 in the state where the dust 13 has the concentration n1, the determination is made in step S15 as to whether or not the predetermined condition duration has reached the time t1 (time data 21d). Is done.

  If it is determined No in step S15, the process of step S15 is performed again. If it determines with Yes at step S15, conditions will be changed (step S16) and it will return to step S11. For example, if it is determined in step S15 that Yes [that is, the predetermined condition duration has reached the time t1 (time data 21d)] in step S16, in step S16, “the concentration n1 of the dust 13, the particle size k1, the wind speed v1. , Time t1 ”is changed to the condition“ the state of the dust 13 concentration n2, particle size k2, and wind speed v2 is time t2. ”

  According to the present embodiment, the controller 42 controls the axial fan 17 and the dust supply device 14 based on dust supply conditions (wind speed data 21a, dust concentration data 21b, particle size data 21c, and time data 21d) determined in advance. Since the dust 13 is supplied to the test vehicle 16 from the rotating shaft 32 of the axial flow fan 17 through the first rectifying plate 25 under the control, the multi-dust road traveling environment is reproduced in the dust circulation chamber 12. And, because the multi-dust road driving environment is reproduced without using the test course actual driving dust-proof performance test, road condition and driver operation variation are eliminated, and the reproducibility of the multi-dust road driving environment is improved. In addition, it is possible to avoid repeated tests that can occur in the actual traveling dustproof performance test on the test course, thereby speeding up product development. In addition, since it is possible to reproduce a multi-dusty road environment without being influenced by the weather, the initial test plan is not changed due to bad weather.

  By the way, as shown in FIG. 3B, the flow velocity distribution of the fan 50 becomes faster (the pressure becomes lower) from the center of the fan 50 toward the outside, so that when the dust 13 is supplied from the outside of the fan 50, the stirring speed is increased. And the dust 13 is difficult to send uniformly. On the other hand, in the present embodiment, the axial fan 17 discharges the dust 13 from one end side 37 of the rotating shaft 32 disposed at the center of the blade 31 as shown in FIG. Therefore, the stirring speed of the dust 13 can be increased, and the dust 13 can be made uniform at an early stage.

Further, since the dust 13 is supplied to the test vehicle 16 through the first rectifying plate 25, the dust 13 can be efficiently supplied to the test vehicle 16, and the test time can be shortened accordingly. .
Further, since the dust circulation traveling environment is reproduced in the dust circulation chamber 12, vibration during traveling is eliminated, camera photography and the like are facilitated, and the analysis of the intrusion route of the dust 13 into the engine room 16b and the vehicle compartment 16e is performed. It becomes easy to do. In addition, the reliability of the imaging data is improved.

  In the above-described embodiment, the vehicle is actually obtained by traveling the dust supply conditions (wind speed data 21a, dust concentration data 21b, particle size data 21c, and time data 21d) stored in advance in the storage unit 22. However, instead of this, the dust supply conditions may be obtained by desktop calculation.

  In the above-described embodiment, when the rotating shaft 32 is inserted into the blade portion 31, the end surface 37 a on the one end side 37 of the rotating shaft 32 is made to coincide with the hub first end surface 36 a, but this is replaced. The end surface 37a on the one end side 37 may be slightly protruded from the hub first end surface 36a as long as the stirrability of the dust 13 is not significantly reduced.

1 shows a dustproof test apparatus according to an embodiment of the present invention, (A) is a diagram schematically showing the apparatus, and (B) is a waveform diagram showing an example of a control signal output by the controller of (A). It is. It is sectional drawing which shows the axial fan of FIG. FIG. 1 shows a comparison of dust stirring performance of the axial fan of FIG. 1 and a conventional fan, FIG. 1 (A) shows how dust is stirred by the axial fan of FIG. 1, and FIG. It is a figure which shows a mode. It is a flowchart which shows the effect | action of the dustproof test apparatus of FIG. It is a flowchart which shows the content of step S3 of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 ... Dust circulation chamber (test room), 14 ... Dust supply apparatus, 16 ... Test vehicle, 17 ... Axial fan (blower), 19 ... Dust circulation path, 42 ... Controller (control means).

Claims (6)

A blower arranged in the test chamber and blowing dust from the dust supply device to the test vehicle;
One end side is opened facing the area facing the air blower with the test vehicle in between, the other end side is opened in the vicinity of the air blower, and dust-containing air is moved from one end side to the other. A dust circulation path to guide the end side,
Control means for controlling the dust supply device and the blower device based on a predetermined dust supply condition, the blower device is an axial fan, and the axial fan is a central portion of a blade portion. A dustproof test apparatus characterized in that it has a cylindrical rotating shaft that is inserted into the nozzle, and the rotating shaft discharges dust supplied from the dust supply device. 2. The dustproof test apparatus according to claim 1 , wherein the dust supply conditions include data relating to wind speed, dust concentration, and dust particle size. The dust supply conditions, dustproof test apparatus according to claim 1 or 2, characterized in that it is determined on the basis of the dust falling state during actual running of the vehicle. A blowing step for controlling the dust supply device and the blower device based on a predetermined dust supply condition to blow dust from the dust supply device to the test vehicle, and a region facing the blower device via the test vehicle dust together with air reaching, back to the vicinity of the blower, possess a circulating step of circulating the dust and air, the blower is an axial fan, axial flow fan blade portion A dust-proof test method comprising: a rotating shaft passing step in which the rotating shaft receives the dust supplied from the dust supply device and discharges the dust. . 5. The dustproof test method according to claim 4 , wherein the dust supply condition includes data relating to wind speed, dust concentration, and dust particle size. 6. The dustproof test method according to claim 4 or 5 , wherein the dust supply condition is determined based on a dust standing state during actual traveling of the vehicle.

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