JP2805638B2 - Chassis dynamometer device using conveyor belt - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called chassis dynamometer device for testing various performances of a vehicle undercarriage, and a test device that approximates a real road running condition. And effective for performing tests such as anti-lock and traction control systems in a test room.

[Prior Art and Problems] A conventional chassis dynamo has a structure in which wheels are mounted on rollers, and is roughly divided into one in which wheels are mounted on one roller (Japanese Patent Laid-Open No. 51-95301). The wheel is mounted.

The outline of the latter prior art is as shown in FIG. 1, in which a wheel 1 rotates while abutting on a circular outer surface of a pair of rollers 2 and 2. Therefore, the contact state of the wheel with the roller is significantly different from the ground contact state on the road surface when driving on a real road, regardless of how the outer surface of the roller is approximated to the actual road surface, and the anti-lock and traction control system And other tests cannot be performed.

On the other hand, actual driving tests on anti-lock and traction control systems are performed by actual road driving tests, but the test data lacks accuracy because the sensors are mounted on the running vehicle, and tests for rainy weather tests are not Become massive. In particular, there is an inconvenience that the test during snowfall is subject to seasonal restrictions.

The present invention solves the above-mentioned inconvenience, and enables an actual running test under various road surface conditions to be performed in a room, and the grounding state of wheels in a test device can be changed to the grounding state of wheels on a road surface. It is an object to make the approximation to

[Measures taken to solve the problem] The measures taken to solve the above problems are the following elements (a)-
(E).

(A) The distance between the pair of front and rear rollers is greater than the length of the vehicle body, and a conveyor belt wider than the vehicle width is wound around both rollers. (B) The surface of the conveyor belt has the same friction coefficient as that of a general road. (C) the vehicle body holding device is positioned at the center of the conveyor belt and fixed to the supporting structure so as to be vertically movable; (e) the vehicle body holding device is longitudinally caused by the behavior of the vehicle. [Function] The vehicle body is held on a conveyor belt by a vehicle body holding device, and movement in the front-rear direction, the left-right direction, and the turning direction is regulated. However, since the vehicle body holding device allows the vehicle body to move up and down, the vehicle body weight is supported by the conveyor belt, and the wheels are supported by the conveyor rollers in the same state as when traveling on a real road.

The conveyor belt is run either by driving the wheels using an automobile engine or by driving the rollers using an electric inertial motor. Thus, the wheels are relatively rotated with respect to the conveyor belt, and a real road running state is realized on the conveyor belt.

During the antilock test and the traction control system test, the longitudinal force, the lateral force and the turning force applied to the vehicle body are detected by an external force measuring device provided in the vehicle body holding device.

The surface of the roller is covered with a racking material molded of synthetic resin with a mixture of alumina, silica or other metal oxide or carbide particles, and the friction coefficient between the roller and the conveyor belt is calculated from the friction coefficient between the conveyor belt and the wheels. It is also an embodiment of the present invention to drive the belt conveyor so that the slip is not substantially caused by making it sufficiently large.

Further, when evaluating the performance of the anti-lock brake and the like, it is indispensable to accurately measure the vehicle speed and the tire speed, but it is difficult to accurately measure the vehicle speed in actual running. On the other hand, in the present invention, the vehicle speed (relative speed between the conveyor and the vehicle) is more accurate if a black and white pattern having a constant pitch is provided at one end of the conveyor belt and the running speed of the pattern is detected by an optical sensor. This is preferable for detecting

A running test is performed under rainfall conditions by spraying water in front of the conveyor belt with a shower, and a running test is performed under snowfall conditions by blowing snow.

Also, spray a suitable anti-friction material on the conveyor belt,
By reducing the coefficient of friction between the wheels and the conveyor belt, it is possible to perform a running test under so-called low μ road surface conditions.

Further, if necessary, the roller may be a timing roller and the conveyor belt may be a timing conveyor belt, so that the teeth of the timing conveyor belt mesh with the teeth of the timing roller, so that the conveyor belt does not slip on the roller. You can also do so. However, make sure that there is no unevenness at the wheel position.

Embodiment An embodiment of the present invention will be described with reference to FIG.

A pair of rollers 10, 10 are provided at an interval L sufficiently longer than the length of the vehicle body B, and both rollers are rotatably supported by an appropriate receiving stand.

A conveyor belt 20 having sufficient strength is wound around both rollers. The width W of the conveyor belt is sufficiently larger than the width of the vehicle body B. The surface of this conveyor belt is covered with a suitable layer of abrasion-resistant material 22 to create a surface condition similar to a general road.

An electric inertia motor M is directly connected to the rear roller 10.

The upper end of the vehicle body holding device H is fixed to the support structure F so as to be vertically movable. This vehicle body holding device has a force measuring device S, and detects forces acting on the vehicle body holding device in the front-rear direction, the left-right direction, and the turning direction with the force measuring device.

The vehicle body holding device has four arms 31 (front, rear, left and right) and a rectangular plate-shaped frame 30, and this frame 30 is fixed to the support structure F via an external force measuring device S so as to be vertically movable. .

The arm 31 is detachable from the lower surface of the vehicle body B, and holds the vehicle body B with four arms in the front-rear direction, the left-right direction, and the turning direction.

A black and white pattern 24 is provided at a constant pitch on the left end of the conveyor belt 20, and an optical sensor 25 is installed above the pattern 24, and the traveling speed of the conveyor belt 20 is measured by the optical sensor. This may be a non-contact type sensor of an eddy current type, a magnet type, or a capacitance type other than the optical sensor.

In this example, the rear roller 10 is driven by an electric inertial motor, and the conveyor belt 20 is driven by the roller 10.
, So that a slip does not substantially occur.

When an electric inertial motor brakes the wheels of a car,
The rotation of the roller can be controlled by detecting the degree of the braking effect (the degree of resistance to traveling of the conveyor belt 20).

A test similar to a conventional real road running test, such as an anti-lock test and a traction control system, is performed. At this time, the forces in the front-rear direction, the left-right direction, and the turning direction applied to the vehicle body are detected by the force measuring device S.

A shower or a snowfall device 40 is provided above the front end of the conveyor belt 20, and water and snow are sprayed on the front end of the conveyor belt 20, so that the upper surface of the conveyor belt can be used for road surface conditions during rainfall and snowfall. Approximate.

In addition, in order to reduce the deflection of the conveyor belt 20,
It is preferable that the conveyor belt be supported by the support plate 23. In this case, the support surface of the support plate 23 is coated with a synthetic resin having a low friction coefficient to reduce the frictional resistance of the support plate to the conveyor belt.

In addition, when the roller is a timing roller and the conveyor belt is a timing conveyor belt, the teeth of the timing conveyor belt can be meshed with the teeth of the timing roller, so that the belt does not slip on the roller.

[Effect] The subject of the present invention described above is novel. Therefore, solving the above-mentioned problems and performing various tests similar to actual road driving indoors is a unique effect of the present invention. In addition, the present invention has the following advantages.

Running tests under various road conditions can be performed at any time without being affected by the seasonal weather, and running tests can be performed with the vehicle body fixed, so there is little noise and the vehicle speed can be detected. It is easy and highly accurate data can be obtained. Further, since various various road surface conditions can be realized on the conveyor belt, the test pattern can be densified, and precise data can be obtained for each vehicle.

[Brief description of the drawings]

FIG. 1 is a side view of the prior art, and FIG. 2 is a perspective view of an embodiment of the present invention. In the figure, 1 ... wheel, 2 ... roller, 10 ... roller, 20 ...
… Conveyor belt, 22 …… Masu, surface layer of anti-friction material, 23 ……
Support plate, 24: black-and-white pattern, 25: optical sensor, 30: plate-shaped frame, 31: arm, 40: shower or snowfall device, B: vehicle body, L: distance between front and rear rollers , W
…… Conveyor belt width, M …… Electric inertia motor, H
... A vehicle body holding device, F ... a support structure, S ... a force measuring device.

Claims (6)

(57) [Claims] The distance between a pair of front and rear rollers is equal to or greater than the length of the vehicle body, a conveyor belt having a width wider than the width of the vehicle body is wound around both rollers, and the surface of the conveyor belt has a friction coefficient equivalent to that of a general road. The vehicle body holding device was positioned substantially at the center of the conveyor belt and fixed to the supporting structure so as to be vertically movable, and the vehicle body holding device was provided with a force measuring device in the front-rear direction, the left-right direction, and the turning direction. Chassis dynamometer device. 2. The chassis dynamometer device according to claim 1, wherein one of the front and rear rollers is driven by an electric inertial motor. 3. The chassis dynamometer device according to claim 1, wherein the front and rear roller surfaces are covered with a lagging material formed of a synthetic resin mixed with alumina and silica particles. 4. The chassis dynamometer device according to claim 1, wherein the roller is a timing roller and the conveyor belt is a timing conveyor belt. 5. The chassis dynamometer device according to claim 1, wherein a rainfall / snowfall device is provided above the front end of the conveyor belt. 6. The chassis dynamometer apparatus according to claim 1, wherein a black and white pattern having a constant pitch is provided at one end of the conveyor belt, and an optical sensor or the like is provided above the pattern.