JP4102486B2 - Car running test equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automobile running test apparatus that performs a simulated running test of an automobile using a chassis dynamometer device.
[0002]
[Prior art]
As is well known, an automobile running test apparatus using a chassis dynamometer apparatus is used in connection with an automobile engine exhaust gas test in accordance with exhaust gas regulations of the US Environmental Protection Agency (EPA).
For example, “theory and practice of factory ventilation” (see pages 175 to 177) published by the Japan Air Conditioning and Sanitation Engineering Society is known as a local exhaust for vehicle exhaust gas in an automobile assembly line.
[0003]
The local exhaust for vehicle exhaust gas in the automobile assembly line is a stationary high-speed running test using a drum tester and a chassis roller for functional inspection in the vehicle inspection line after assembly.
Normally, during stationary high speed running, the vehicle runs stationary at a maximum of 6000 rpm, so exhaust gas is discharged into the line at a maximum speed of 50 m / s from the tail pipe (60φ × 2) of the vehicle. The temperature of the exhaust gas is about 160 ° C., and 1-4% of CO is contained in the exhaust gas.
[0004]
Conventionally, exhaust is performed only by side suction or downward suction. However, since the exhaust gas has a high speed, the collection efficiency is poor and the work environment is contaminated.
In order to solve this problem, the following matters have been studied.
(1) The exhaust gas volume and speed of the vehicle vary depending on the vehicle type and inspection contents, so that exhaust gas can be efficiently collected under any conditions.
[0005]
(2) The suction hood is made up and down so as not to interfere with vehicle traffic, and is linked to the vehicle's fixed position signal.
(3) Since the tail pipe of the vehicle has right, left, or both cases depending on the vehicle type, it should have a hood shape that can accommodate both.
(4) The optimum suction wind speed was determined by conducting model experiments for various patterns of the distance between the blowout and the suction and the suction wind speed.
[0006]
Based on the results of this study, the vehicle running test apparatus shown in FIG. 4 has been devised.
The vehicle under test 1 travels along the road 2 and a stationary travel inspection A, a braking force inspection B, and an exhaust gas inspection C are performed.
In the stationary traveling inspection A and the braking force inspection B, the exhaust gas is sucked by the up / down hood 5 installed in the pit 3 provided along the traveling road 2.
[0007]
As shown in FIGS. 5 and 6, the up / down hood 5 is opened and closed by an exhaust duct 6 communicating with the exhaust fan 10, a hydraulic cylinder 7 provided at an opening end of the exhaust duct 6, and the hydraulic cylinder 7. The lid 8 and the opening 9 provided in the runway 2 while the lid 8 is attached.
Here, since the up / down hood 5 has a high exhaust gas discharge speed at high speed rotation, it prevents diffusion due to dynamic pressure when it hits the hood surface. Also, since the discharge speed is low at idling, the up / down hood 5 has a certain distance. It is designed so that exhaust gas collection efficiency does not drop.
[0008]
Further, the relationship between the position of the suction port and the exhaust gas discharge side, the shape of the suction, and the suction air speed was obtained by model experiments, the hood opening surface suction air speed was 3.5 to 4.0 m / s, and the suction air amount was 200 m ³ / min. .
On the other hand, systems other than the up / down hood are exhausted by the same exhaust fan system, and the exhaust air volume of each system is as shown in FIG.
[0009]
The pressure loss in the duct determined the total pressure of the exhaust fan as 1.47 Pa / m {0.15 mmAq / m}.
An axial fan (belt hook) was used as the exhaust fan 10.
# 900 × 670m ³ / min × 80mmAq × 22kW
In addition, the axial-flow fan was a motor-exposed belt-hanging system.
[0010]
Moreover, the air conditioner 11 is provided and the line is air-conditioned.
On the other hand, in the stationary running inspection A, the road roller 2 on which the driving wheel 1a of the vehicle under test 1 is placed in parallel on the road 2 where the vehicle under test 1 travels, and the driven wheel 1b of the vehicle under test 1 are arranged. And a free roller 17 is provided.
The load roller 16 communicates with the chassis dynamometer device 15.
[0011]
According to the vehicle running test apparatus configured as described above, the following installation effect is achieved.
(1) The CO concentration as a working environment around the line could be 10 ppm or less.
(2) The amount of exhaust air was reduced by about 30% compared to the conventional method.
(3) Compact and lightweight.
[0012]
[Problems to be solved by the invention]
Incidentally, the following problems have been pointed out in the above-described conventional automobile running test apparatus.
In the stationary running inspection A, there is a possibility that exhaust gas is not exhausted sufficiently.
[0013]
This is because the up / down hood 5 is open for a short time, the distance from the engine to the up / down hood 5 is nearly 6 m, and suction cannot be captured, and there is not enough exhaust equipment.
Further, as shown in FIG. 5, off-flavors are generated from the engine room or the vicinity of the tire.
[0014]
Further, the off-flavor generated from the vicinity of the tire is caused by friction between the drive wheel 1 a and the road roller 16.
On the other hand, in the braking force test B, an exhaust gas odor is generated. Moreover, although it is weaker than the stationary running inspection A, a strange odor is generated.
This seems to be the same problem as the stationary running inspection A.
[0015]
Therefore, if an electric fan is installed on the runway 2 and the electric fan is turned, the bad odor diffuses and the bad odor is temporarily not felt.
However, if the fan is stopped, it will stay and the working environment will deteriorate.
Further, there is a problem that the electric fan becomes a disturbance and the suction flow into the up / down hood 5 is interrupted.
[0016]
Therefore, even if an electric fan or the like is provided, it has not been possible to solve the problem described above.
Therefore, there was no solution other than exhausting for a while after the stationary running inspection A and the braking force inspection B were completed.
The present invention has been made to solve such conventional problems, and an object thereof is to provide an automobile inspection apparatus capable of reliably removing off-flavors in stationary running inspection and braking force inspection in an inspection line. There is to do.
[0017]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a driving test apparatus for an automobile, which is provided on a running path on which a vehicle under test travels, a road roller on which a roller portion on which a driving wheel of the vehicle under test is placed is arranged in parallel, and a chassis dynamo Exhaust gas suction device that has a meter device and a lid that can be opened and closed, and that sucks the exhaust gas of the vehicle under test during a simulated running test on the road roller, and the exhaust gas that communicates with the exhaust gas suction device and exhausts the exhaust gas outside the system And a nozzle that is positioned in front of the road roller and that generates a high-speed jet from the front of the vehicle under test during a simulated running test on the road roller toward the exhaust gas suction device. .
[0018]
An automobile running test apparatus according to a second aspect is the automobile running test apparatus according to the first aspect, wherein the nozzle is installed so as to be movable up and down.
An automobile running test apparatus according to claim 3 is the automobile running test apparatus according to claim 1 or 2, wherein the nozzle is located between drive wheels of the vehicle under test.
[0019]
An automobile running test apparatus according to claim 4 is the automobile running test apparatus according to any one of claims 1 to 3, wherein the height of the nozzle is lower than the lowest ground height of the vehicle under test. It is characterized by.
The automobile running test apparatus according to claim 5 is the automobile running test apparatus according to any one of claims 1 to 4, wherein the number of the nozzles is two, and the nozzles are parallel to the running path. It is characterized by being arranged.
[0020]
An automobile running test apparatus according to claim 6 is the automobile running test apparatus according to any one of claims 1 to 5, wherein the nozzle is provided on the runway and includes a lid that can be freely opened and closed. It is characterized in that it can be raised and lowered in the opening.
The automobile running test apparatus according to claim 7 is the automobile running test apparatus according to any one of claims 1 to 6, wherein the nozzle is located in a pit provided at a lower portion of the running road. A high-speed jet is generated by supplying air from the fan.
[0021]
(Function)
In the vehicle running test apparatus according to any one of claims 1 to 7, when the vehicle under test puts the driving wheel on the road roller and enters the test running state according to a predetermined inspection item, the vehicle is tested between the driving wheel and the road roller. An odor is generated from the drive wheel by friction.
This off-flavor is forcibly discharged toward the exhaust gas suction device by a high-speed jet jetted from the nozzle toward the exhaust gas suction device from the front of the vehicle under test during the simulated running test on the road roller.
[0022]
Also, the off-flavor generated from the engine room is forcibly discharged toward the exhaust gas suction device by a high-speed jet flow similarly ejected from the nozzle.
At this time, a large amount of air can be sucked in from the surroundings of the vehicle under test by the attraction effect by the high-speed jet jetted from the nozzle, and the off-flavor can be effectively guided to the exhaust gas suction device.
[0023]
In the vehicle running test apparatus according to the second aspect, when the vehicle under test moves for each inspection, the nozzle descends from the runway, so that there is no obstacle.
Moreover, it becomes possible to fix a nozzle to appropriate height according to a to-be-tested vehicle.
In the vehicle running test apparatus according to the third aspect, since the nozzle is located between the drive wheels of the vehicle under test, there is no obstacle when the vehicle under test moves for each inspection.
[0024]
In the vehicle running test apparatus according to claim 4, since the height of the nozzle is lower than the lowest ground height of the vehicle under test, a large amount of the nozzle from the periphery of the vehicle under test can be obtained by the attraction effect by the high-speed jet ejected from the nozzle. It is possible to inhale air and effectively induce a strange odor to the exhaust gas suction device.
In the automobile running test apparatus according to claim 5, since the two nozzles are arranged in parallel along the running path, the attraction effect due to the high-speed jet ejected from the nozzles causes the surroundings of the vehicle under test to be tested. A large amount of air can be sucked in, and a strange odor can be effectively guided to the exhaust gas suction device.
[0025]
In the vehicle running test apparatus according to the sixth aspect, the nozzle is provided on the runway and is disposed so as to be raised and lowered within the opening having an openable / closable lid, so that the vehicle under test moves for each inspection. There will be no obstacles.
In the automobile running test apparatus according to the seventh aspect, since the nozzle generates a high-speed jet by a fan located in a pit provided at the lower part of the running road, it is not necessary to provide a special pipe.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 show a first embodiment of an automobile running test apparatus according to the present invention (corresponding to claims 1 to 7).
The automobile running test apparatus according to this embodiment corresponds to the stationary running inspection A in FIG.
[0027]
5 is different from the conventional automobile running test apparatus in FIG. 5 in that two nozzles 20 are provided on the runway 2 through a hydraulic cylinder 21 so as to be movable up and down. Therefore, in this embodiment, the same code | symbol is attached | subjected about the same component in FIG. 4, FIG. 5, and the description is abbreviate | omitted.
As shown in FIG. 2, the nozzle 20 is provided so as to be parallel to the running path 2 at a distance S <b> 2 that is smaller than the distance S <b> 1 between the drive wheels 1 a and 1 a of the test vehicle 1. Here, the interval S <b> 2 is determined by the tail pipe and the tire width provided at the lower part of the test vehicle 1, and is, for example, 400 mm to 600 mm from the center of the test vehicle 1.
[0028]
The nozzle 20 has an inner diameter of 20 mm and communicates with an air supply fan 23 installed in the pit 3 via a pressure-resistant hose 22 such as a cloth-wrapped rubber hose.
The nozzle 20 and the pneumatic cylinder 21 are connected via a flange 24 so that the pneumatic cylinder 21 can be expanded and contracted in the vertical direction.
[0029]
The height of the nozzle 20 is set so as not to contact the vehicle under test 1. For example, the minimum ground height of the vehicle under test 1 is 150 mm or less (in the case of a normal passenger car, the height under the floor is 100 to 180 mm). Obstacles shall be 110 mm or more.
An opening 25 is formed at a position where the nozzle 20 is projected and retracted. A lid 26 that can be freely opened and closed is attached to the opening 25. The lid 26 is attached via a hinge (not shown). The lid 26 is opened and closed by a pneumatic cylinder 27.
[0030]
The opening 25 is provided at a position where the tire of the vehicle under test 1 does not step on.
The opening 25 is provided at a position 500 mm away from the bumper 1 c of the vehicle under test 1 in the next braking force test B direction.
Next, the operation of this embodiment will be described.
First, when the vehicle under test 1 enters the stationary running inspection A in FIG. 4 and stops at this position, a sensor (not shown) senses that the vehicle under test 1 is on the road roller 16, and in response to a command from this sensor. Then, the pneumatic cylinder 27 is operated to open the lid 26.
[0031]
Next, a sensor (not shown) senses the opening of the lid 26, and the pneumatic cylinder 21 is operated by a command from this sensor to cause the nozzle 20 to protrude from the opening 25 onto the runway 2. Stop at a predetermined position with a height of 150 mm or less.
At the same time, a sensor (not shown) senses that the vehicle under test 1 is on the road roller 16, and in response to a command from this sensor, the pneumatic cylinder 7 is operated in the up / down hood 5 to open the lid 8, and the device under test The exhaust gas from the car 1 is sucked.
[0032]
In this state, a sensor (not shown) senses that the nozzle 20 protrudes to a predetermined position, and the air supply fan 23 is operated by a command from this sensor, and the nozzle 20 moves toward the opening 9 of the up / down hood 5. Then, air is blown out at an initial speed of 45 m / s or more to generate a high-speed jet.
Then, the drive wheel 1a of the vehicle under test 1 rotates on the load roller 16, and inspection by the chassis dynamometer device 15 is performed.
[0033]
During this inspection, the bad smell generated from the engine and the bad smell generated by the friction between the tire and the road roller 16 (see FIG. 5) are increased by the high-speed jet flow from the nozzle 20 toward the opening 9 of the up / down hood 5. It is forcibly sent to the opening 9 of the down hood 5.
At the same time, as shown in FIG. 2, a large amount of air is attracted from the periphery of the vehicle under test 1 as indicated by an arrow by the high-speed jet from the nozzle 20 and is forcibly sent to the opening 9 of the up / down hood 5. Dispersion of off-flavors can be prevented.
[0034]
When the predetermined inspection is completed and the drive wheel 1a of the vehicle under test 1 is released from the restraint state by the load roller 16, a sensor (not shown) detects this, and the command from this sensor causes the pneumatic cylinder 21 to In operation, the nozzle 20 is stored in the opening 25.
Next, a sensor (not shown) senses the storage of the nozzle 20, and the pneumatic cylinder 27 is operated by a command from this sensor to close the lid 26.
[0035]
Next, a sensor (not shown) senses the closure of the lid 26, and the vehicle under test 1 moves to the next braking force test B in accordance with a command from this sensor.
At the same time, the pneumatic cylinder 7 is operated to close the lid 8 of the up / down hood 5.
Thus, the stationary travel inspection A is completed.
As described above, according to the present embodiment, in the stationary running inspection A, the two nozzles 20 protrude in front of the vehicle under test 1, and the up / down hood from each nozzle 20 using the under floor of the vehicle under test 1. Since a large amount of air can be attracted from the periphery of the vehicle under test 1 by generating a high-speed jet toward the opening 9 of the engine 5, The unpleasant odor due to the friction (see FIG. 5) can be forcibly sent to the opening 9 of the up / down hood 5 without diffusing and reliably exhausted.
[0036]
Therefore, even if the source of off-flavor i and ro is away from the up / down hood 5, it can be quickly exhausted without being retained.
For this reason, it is possible to reliably prevent environmental deterioration in the inspection line.
Further, the two nozzles 20 protrude on the road 2 in the stationary running inspection A, and when the vehicle under test 1 moves to the next braking force inspection B, the two nozzles 20 are immersed under the road 2. Will not interfere with driving.
[0037]
Furthermore, since the two nozzles 20 can generate a high-speed jet by the supply fan 23 provided in the pit 3, it is not necessary to install special piping.
FIG. 3 shows a second embodiment of the automobile running test apparatus according to the present invention (corresponding to claims 1, 3, 4, 5, and 7).
The vehicle running test apparatus according to the present embodiment is set so that the nozzle 20 does not move up and down and is located under the floor of the vehicle under test 1 and between the left and right tires.
[0038]
Also in this embodiment, the same operational effects as those in the above embodiment can be obtained.
Next, the relationship between the inner diameter of the nozzle 20 and the distance to the opening 9 of the up / down hood 5 will be described.
Here, the inner diameter of the nozzle 20 is d, the initial speed is V ₀ , the initial air volume is Q ₀ , the residual wind speed at the opening 9 of the up / down hood 5 is V _c , the final wind speed is Q _C , and the up / down hood from the nozzle 20 Let X be the distance to 5 opening 9.
[0039]
Applying this to the practical formulas (1) and (2) of “Theory and Practice of Factory Ventilation” (page 19) published by the Japan Society for Air Conditioning and Sanitation Engineering, the following is calculated.
V _c / V ₀ = 6.3 · d / x (1)
Q _C / Q ₀ = 0.32 · x / d (2)
Conditions: The displacement of the up / down hood 5 is 12,000 m ³ / h, and the opening suction air speed of the up / down hood 5 is 3.5 m / s.
[0040]
Full-scale model experiment (equivalent to Figs. 1 and 2)
Nozzle inner diameter 20mm
Initial speed V ₀ = 47 m / s
Initial air flow per nozzle Q ₀ = 53m ³ / h
Reach distance X = 6m
Residual wind speed V _c = 6.3 × d / x × V ₀ = 6.3 × 0.02 / 6 × 47
= 0.987 m / s ≒ 1.0 m / s
Final air flow per vehicle Q _C = 0.32 × x / d × Q ₀
= 0.32 × 6 / 0.02 × 53 = 5,088 m ³ / h
Assuming that the combined air volume is 80% of the two nozzles and the restricted flow between the under-seat and the floor of the vehicle under test, the amount of attraction is as follows.
[0041]
Attractant amount = 5,100m ³ /h×2×0.8=8,160m ³ / h
Therefore, the amount of attraction is about 70% of the displacement 12,000 m ³ / h of the up / down hood 5.
Next, a case where the air volume of the nozzle 20 is set to 60 m ³ / h from experimental data will be described.
[0042]
Example 1
Assuming that the nozzle inner diameter is 20 mm, the initial speed V ₀ = 53 m / s, and the remaining wind speed V _c = 1.0 m / s, the reach distance X is X = 6.3 × 0.02 × 53/1 = 6.6 m.
Further, the attracting amount Q _C is Q _C = 0.32 × 6 / 0.02 × 60 = 5,760 m ³ / h.
[0043]
Therefore, the combined air volume Q is Q = 5,760 × 2 × 0.8 = 9,200 m ³ / h.
As a result, the combined air volume Q is about 77% of the displacement 12,000 m ³ / h of the up / down hood 5.
Example 2
Assuming that the nozzle inner diameter is 40 mm, the initial speed V _{0 is} 13 m / s, and the remaining wind speed V _{c is} 1.0 m / s, the reach distance X is X = 6.3 × 0.04 × 13/1 = 3.3 m.
[0044]
Accordingly, in this case, the high-speed jet from the nozzle 20 does not reach the up / down hood 5.
In each of the above-described embodiments, the case where the inner diameter of the nozzle 20 is 20 mm has been described. However, the attracting amount is larger as the inner diameter is smaller, and thus is not limited to 20 mm. In addition, a smaller inner diameter is preferable because it does not interfere with the vehicle under test 1.
[0045]
In each of the above embodiments, the inspection line has been described. However, the present invention is not limited to this, and any traveling test apparatus using a chassis dynamometer apparatus may be used, and the present invention is not particularly limited thereto.
[0046]
【The invention's effect】
As described above, according to the vehicle running test apparatus according to claims 1 to 7, the vehicle under test generates the off-flavor generated during the test running test in which the vehicle under test is mounted on the road roller. The high-speed jet ejected from the nozzle provided in front of the engine and the attraction effect of this high-speed jet forcefully exhausts the exhaust gas toward the exhaust gas suction device, and inhales a large amount of air from the surroundings of the vehicle under test, effectively reducing off-flavors. It is possible to guide to the exhaust gas suction device.
[0047]
As a result, it is possible to prevent environmental deterioration of the automobile running test apparatus including the chassis dynamometer device.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an automobile running test apparatus according to a first embodiment of the present invention.
FIG. 2 is an explanatory view showing FIG. 1 from above.
FIG. 3 is an explanatory view showing an automobile running test apparatus according to a second embodiment of the present invention.
FIG. 4 is an explanatory view showing a function inspection line in a conventional automobile running test apparatus.
FIG. 5 is an explanatory view showing the automobile running test apparatus in FIG. 4;
FIG. 6 is an explanatory view showing FIG. 5 from above.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Test vehicle 1a Drive wheel 2 Runway 3 Pit 5 Up / down hood 6 Exhaust duct 7 Pneumatic cylinder 8 Lid 9 Opening part 10 Air exhauster 11 Air conditioner 15 Chassis dynamometer device 16 Road roller shutter 17 Free roller 20 Nozzle 21, 27 Pneumatic cylinder 22 pressure hose 23 air supply fan 25 opening 26 lid

Claims (7)

A road roller provided on a runway on which the vehicle under test travels and in which roller portions on which driving wheels of the vehicle under test are placed are arranged in parallel;
A chassis dynamometer device in contact with the road roller;
An exhaust gas suction device that includes an openable and closable lid, and sucks the exhaust gas of the vehicle under test during a simulated running test on the road roller;
An exhaust device that communicates with the exhaust gas suction device and exhausts the exhaust gas outside the system;
A vehicle running comprising: a nozzle positioned in front of the road roller and generating a high-speed jet toward the exhaust gas suction device from the front of the vehicle under test during a simulated running test on the road roller. Test equipment. The vehicle running test apparatus according to claim 1,
The above-mentioned nozzle is installed so that raising and lowering is possible, The running test device of the automobile characterized by things. In the driving test apparatus for an automobile according to claim 1 or 2,
An automobile travel test apparatus, wherein the nozzle is located between drive wheels of a vehicle under test. In the driving test device for an automobile according to any one of claims 1 to 3,
An automobile running test apparatus characterized in that the height of the nozzle is lower than the lowest ground clearance of the vehicle under test. In the driving test apparatus of the automobile according to any one of claims 1 to 4,
2. A traveling test apparatus for an automobile, wherein the number of nozzles is two and the nozzles are disposed in parallel along the traveling path. The automobile running test apparatus according to any one of claims 1 to 5,
An automobile travel test apparatus, wherein the nozzle is provided in the runway and is disposed so as to be movable up and down in an opening provided with an openable / closable lid. The travel test apparatus for an automobile according to any one of claims 1 to 6,
An automobile running test apparatus characterized in that the nozzle communicates with a fan located in a pit provided at a lower portion of the runway, and generates a high-speed jet by supplying air from the fan.

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