JPH10197411A - Method for testing splashing of vehicle and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simulate splashing at a tire, by introducing an air flow adjusted to a required humidity, a required temperature and a flow speed corresponding to a run speed of a vehicle from a main nozzle into a wind tunnel and blowing to a sample vehicle. SOLUTION: A pump 21 is driven by a motor 24 so that the water supplied from a water flow nozzle 14 moves on a rotary roller of a chassis dynamometer 3 rotating a front wheel FT with the same speed as the rotary roller. The water from the nozzle 14 is blown out in a rotational direction of the rotary roller at a speed equal to a rotating velocity of the roller. Therefore, the water with no speed difference rides on the rotary roller, generating a state of a puddle on a road face. Meanwhile, the front wheel FT is rotated forward by the rotary roller, whereby a truck S does not advance although it vibrates. As a result, the FT relatively runs on the road face with the simulated puddle on the rotary roller, splashing the water. A state where the FT runs into the puddle can be simulated by switching a solenoid valve 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system in which a test vehicle is arranged on a rotating roller of a chassis dynamometer installed under the floor of a wind tunnel, and is adjusted to a desired humidity and temperature corresponding to the running speed of the vehicle. A flow is introduced from the main nozzle into the wind tunnel and blown onto the vehicle under test, and water is supplied to the front wheel tires of the vehicle under test to simulate a water splash condition at the front tires. It concerns the device.

[0002]

2. Description of the Related Art An engine room in which an engine is mounted is provided at a front portion of a vehicle body, and houses various electric components and equipment. The engine room has a cover against wind and rain from above, preventing rain and snow from entering. However, the lower part of the engine room is full of gaps even with a simple cover, and water droplets or snowmelt water droplets due to splashing of water may enter from these gaps, which may cause the vehicle to be unable to travel. In addition, the tires splash the water that has accumulated on the road surface, and the splashed water collides with various parts of the vehicle to form a mist.If there are many running vehicles, they are further crushed between oncoming vehicles, causing smoke and rising , Which is an obstacle to driving. Therefore, a vehicle that is resistant to water splashing is desired.

Conventionally, a test vehicle is arranged on a rotating roller of a chassis dynamometer installed under the floor of a wind tunnel, and an air flow adjusted to a desired humidity and temperature corresponding to the running speed of the vehicle is transmitted from the main nozzle through the main nozzle. An environmental test apparatus is used which is introduced into a wind tunnel and sprayed on the test vehicle to perform various tests on the vehicle.

In Japanese Patent Application Laid-Open Nos. 57-184943 and 57-191534, water, salt water, muddy water, and the like are put on an air flow blown from a main nozzle of an environmental test apparatus to a test vehicle, and the actual test is carried out. There is disclosed a technique for obtaining a wind and rain state similar to a use state.

[0005] Japanese Utility Model Laid-Open No. 55-123845 and Japanese Utility Model Laid-Open No. 58-8139 disclose a method in which a water tank is placed on a vehicle and water is guided to a front portion of the vehicle by a conduit while running on a road, and the water is ejected from a nozzle. A technology for performing a real-life running experiment on rainy days is disclosed.

[0006]

In each of the above-mentioned prior arts, the water splash of the tire is not reproduced, only the water particles are put on the relative air flow between the atmosphere and the vehicle. Therefore, it is not possible to accurately grasp the state of the water splash, such as how far the water will fly with the tires, the size of the water droplets at the time of the splash, and how the condition of the water changes depending on the shape of the tire.

Although various environments can be reproduced in an experiment using an environmental test apparatus, the water is simply sprayed on the air flow blown from the main nozzle to the vehicle under test, and becomes mist-like. Therefore, it is not easy to reproduce the environment to be experimented.

Accordingly, an object of the present invention is to provide a method and an apparatus for testing the splash of a vehicle which can simulate the splash of a tire in various environments and freely perform the splash test. It is in.

[0009]

A feature of the method for testing the splash of a vehicle according to the present invention that achieves the above object is that the test vehicle is arranged on a rotating roller of a chassis dynamometer installed under the floor of a wind tunnel. The air flow adjusted to the desired humidity and temperature corresponding to the running speed of the vehicle is introduced from the main nozzle into the wind tunnel and blown onto the vehicle under test, and the tire is brought into contact with the front wheel tire of the vehicle under test, and At the top of the rotating roller to be driven to rotate, a water supply nozzle provided on the floor surface of the wind tunnel and having a flat supply port supplies water in the rotating direction of the rotating roller and in accordance with the circumferential speed of the rotating roller to supply water to the front wheel tire. The splash is to simulate the situation.

A feature of the water splash test apparatus for a vehicle according to the present invention, which achieves the above object, is that the test vehicle is arranged on a rotating roller of a chassis dynamometer installed under a floor of a wind tunnel, and the vehicle travels. An airflow adjusted to a desired humidity and temperature at a speed equivalent to the speed is introduced from the main nozzle into the wind tunnel and blown onto the vehicle under test, wherein the tire is brought into contact with a front wheel tire of the vehicle under test to rotate the tire. At the top of the rotating roller, a water nozzle is provided on the floor of the wind tunnel with a flat supply port for supplying water in the direction of rotation of the rotating roller and in accordance with the peripheral speed of the rotating roller. To simulate.

In the present invention, the water supplied from the water flow nozzle moves on the rotating roller at the same speed as the rotating roller, and the vehicle is equivalent to a situation in which the tire is driven to rotate by the rotation of the rotating roller. Therefore, the situation where the water supplied from the water jet nozzle collides with the tire simulates the situation where the vehicle enters a puddle and splashes water.

The environment can be made desired by adjusting the wind speed, humidity, and temperature of the air flow introduced into the wind tunnel and blown from the main nozzle to the vehicle under test, and adjusting the rotation speed of the rotating roller. Further, the shape of the puddle can be made desired by adjusting the shape of the supply port of the water flow nozzle.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on one embodiment shown in the drawings. In FIG. 1, reference numeral 1 denotes a test room provided with a wind tunnel 2, in which a water splash test of a truck S as a test vehicle is performed. Reference numerals 3 and 4 denote waterproof chassis dynamometers for rotating the front wheel FT and the rear wheel RT of the truck S installed below the floor of the wind tunnel 2, and the tops of the rotating rollers are exposed on the floor of the wind tunnel 2. The front wheel FT and the rear wheel RT of the truck S are mounted. 5 is a main nozzle that blows an airflow adjusted to the traveling speed to the truck S, 6 and 7 are air conditioners that adjust the temperature and humidity of the airflow blown from the main nozzle 5 to the truck S so as to be under test conditions, and A moisture regulator 8 is formed between the test chamber 1 and the wind tunnel 2 and is a return path for returning the air flow blown from the main nozzle 5 to the truck S to the air conditioner 6. The turning wing 10 for changing the direction of the flare is a door for putting the truck S in and out of the wind tunnel 2 of the test chamber 1, and the turning wing 9 and the door 10 open and close the inlet 12 in the form of a sliding door. Reference numeral 13 denotes an industrial camera that captures an image of a water splash on the truck S.

Reference numeral 14 denotes a water jet nozzle provided at the floor of the wind tunnel 2 in front of the chassis dynamometer 3 and having a flat supply port. The rotation of the chassis dynamometers 3 and 4 can be freely set by the input device 17 while viewing the screen of the monitor 16 attached to the main controller 15. Reference numeral 18 denotes a motor driver that drives the motor 3a of the chassis dynamometer 3 according to a command from the main control device 15, and 19 denotes a tach generator that detects the number of revolutions of the motor 3a. The detection result is input to the sub control device 20. ing. 21 is a pipe 22
Is driven by a motor 24 with a pump for pumping water supplied from the water nozzle 14 to the front wheels of the truck S from the water tank 23 through the water tank 23.

The sub control unit 20 receives a command from the main control unit 15, an output of the tacho generator 19, and an output of the water pressure gauge 25 installed in the pipe 22, determines a rotation speed of the motor 24, and sends a command to the motor driver 26. The solenoid valve 27 provided in the pipe 22 is opened and closed. Numeral 28 denotes a spray for spraying water to the front wheels FT, as shown in FIG.
Are installed around the device. Reference numeral 29 denotes a flow control valve.

The control of the rear wheel chassis dynamometer 4, main nozzle 5, air conditioner 6 and moisture conditioner 7 is performed by the main controller 15, but details thereof are omitted since they are not directly related to the present invention. . The spray condition of water by the spray 28 is input by the input device 17 and is executed by the sub-control device 20.

Next, the water splash test according to the present invention will be described. The water supplied from the water nozzle 14 is the front wheel FT
Pump 21 moves on the rotating roller at the same speed as the rotating roller of the chassis dynamometer 3 for rotating the
Is driven by the motor 24. As shown in FIG. 2, the water P on the rotating roller 3b of the chassis dynamometer 3 has a width w.
P and a flat rectangular shape of thickness tP simulate a puddle on the road surface. In order to simulate the water splash,
Width wR, width wP of water P on the rotating roller 3b, front wheel FT
The tire width wT is preferably set in the relationship of the following first formula.

WR>wP> wT (1) As shown in FIGS. 3 and 4, the water jet nozzle 14 has a rectangular blow-out portion, and a lower surface member 14b connected by a hinge portion 14a is operated up and down by an elevator 30. The thickness tP of the water P to be blown out is t
It can be changed in the range of P1 to tP2. When the throttle pieces 31 are provided within the range of the region Z on both side surface members 14c of the blowout portion of the water flow nozzle 14, the width wP of the blown water P is set to w.
It can be changed from P1 to wP2. FIG.
Is attached to both side members 14c by bolting. The requirement for the thickness tP of the water P to be blown is in the variable range tP.
If it exceeds 1 to tP2, the attachment of the water flow nozzle 14 to the pipe 22 is replaced.

Since the water blown out from the water flow nozzle 14 is blown out in the direction of rotation of the rotating roller 3b and at a speed corresponding to the peripheral speed thereof, there is no difference in speed, and the water rides on the rotating roller 3b. There is a situation. On the other hand, since the front wheel FT is rotated in the forward direction by the rotating roller 3b, the track S vibrates but does not move forward, and the front wheel FT relatively moves on the road surface with a puddle simulated on the rotating roller 3b. It runs and splashes water. The rotation of the rotating roller 3b is controlled by the tacho generator 1.
9 and the rotation of the pump 21 is controlled, so that even if the rotation speed of the rotating roller 3b, that is, the running speed of the track S changes, the peripheral speed of the rotating roller 3b (= running speed of the track S) The water is supplied according to.

The situation of entering the puddle can be simulated by opening and closing the solenoid valve 27. If you want to simulate rushing one wheel at a time,
Solenoid valves may be provided in the pipes to the water flow nozzle 14 corresponding to one wheel, and these solenoid valves may be opened and closed at an arbitrary time interval.

In the situation where the snowmelt water is splashed, the temperature may be lowered by the air conditioner 6. Then, the situation in which the water splashed and scattered on the truck S adheres to each part of the truck S can be grasped.

In a case where it is desired to grasp the combined situation of the water smoke that the preceding vehicle or the oncoming vehicle rolls up and the water splashed by the truck S,
Water is also sprayed from the spray 28.

The splash condition of the front wheel FT is photographed by the industrial camera 13 and is used for examination. Industrial camera 1
In step 3, a round tire or a flat tire is splashed due to a difference in water splash condition due to a contact shape of the front wheel FT with the rotating roller 3b, a step to a driver seat provided on the truck S, a shape of a tire hood, and the like. The situation of water re-collision can also be grasped. Since the shape of the tire also changes depending on the load on the bed of the truck S, the change in the splash condition can be confirmed by changing the load on the bed of the truck S.

The industrial camera can be arranged on the side of the test vehicle, for example, to check the situation in which splashed water droplets scatter based on the running speed of the truck S.

The splash condition may be recorded by a photographing machine or the like, and is not limited to an industrial camera. The test vehicle is not limited to a truck. Furthermore, the driving form of the wheels is not limited.

[0026]

As described above, according to the present invention, it is possible to freely perform a water splash test by simulating water splash on a tire under various environments.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a water splash test device for performing a water splash test method for a vehicle according to the present invention.

FIG. 2 is a view for explaining a state of water supply in a water splash test device shown in FIG. 1;

FIG. 3 is a schematic sectional view of a water flow nozzle in the water splash test device shown in FIG.

FIG. 4 is a schematic plan view of a water flow nozzle in the water splash test device shown in FIG.

FIG. 5 is a perspective view of an adjusting member added for adjusting a water flow to a water flow nozzle in the water splash test device shown in FIG. 1;

[Explanation of symbols]

S: Truck (test vehicle) FT: Front wheel RT: Rear wheel 1 ... Test room 2 ... Wind tunnel 3, 4 ... Chassis dynamometer 3a, 24 ... Motor 5 ... Main nozzle 6 ... Air conditioner 7 ... Moisture conditioner 8 ... Reflux path 9 ... Turning wing 10 ... Door 12 ... Inlet 13 ... Industrial camera 14 ... Water flow nozzle 15 ... Main controller 16 ... Monitor 17 ... Input device 18, 26 ...
Motor driver 19 ... Tach generator 20 ... Sub-control device 21 ... Pump 22 ... Piping 23 ... Water tank 25 ... Hydraulic pressure gauge 27 ... Solenoid valve 28 ... Sub-water flow nozzle 29 ... Flow control valve 30 ... Elevator 31 ...

Claims (5)

[Claims] 1. A test vehicle is arranged on a rotating roller of a chassis dynamometer installed under a floor of a wind tunnel, and an air flow adjusted to a desired humidity and temperature corresponding to a running speed of the vehicle is transmitted from a main nozzle to the vehicle. In the apparatus introduced into the wind tunnel and sprayed on the vehicle under test, a supply port is provided on the floor of the wind tunnel at the top of the rotating roller that contacts the front wheel tire of the vehicle under test and rotates the tire. A method for testing the splashing of a vehicle, comprising simulating a splashing condition of a front wheel tire by supplying water from a water jet nozzle in a rotating direction of the rotating roller and in accordance with a peripheral speed of the rotating roller. 2. The method according to claim 1, wherein water is intermittently supplied from said water jet nozzle. 3. The method according to claim 1, wherein
A water splash test method for a vehicle, comprising supplying water from an auxiliary water flow nozzle to the front wheel tire portion of the test vehicle in a spray form. 4. A test vehicle is arranged on a rotating roller of a chassis dynamometer installed under the floor of a wind tunnel, and an air flow adjusted to a desired humidity and temperature corresponding to a running speed of the vehicle is transmitted from the main nozzle to the main nozzle. In the method of introducing into the wind tunnel and blowing on the test vehicle, the top of the rotary roller that contacts the front wheel tire of the test vehicle and rotates the tire is adjusted in the rotational direction of the rotary roller and at the peripheral speed thereof. A water jet nozzle having a flat water supply nozzle for supplying water through a floor of the wind tunnel to simulate a water splash condition at a front wheel tire. 5. An apparatus according to claim 4, further comprising an auxiliary water flow nozzle for supplying water to the front tire portion of the test vehicle in a spray form.