JPH0240179B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle stability testing device that can accurately and safely measure vehicle stability, particularly the critical rollover angle.

Conventionally, vehicle stability, especially stability against slope angles (overturns and rollovers), has been tested in the first test.
This was done using a device as shown in the figure. This device is provided with a ramp b that tilts around one end on a base a, and after a vehicle c is placed on the ramp b, the inclination angle of the ramp b is gradually increased, Visually check the moment immediately before vehicle c rolls over (usually the moment when one wheel of the vehicle lifts off ramp b), and measure the inclination angle of ramp b at that time using a tilt angle meter d (for example, a weight meter). ) is a test device that reads the At this time, the vehicle is supported by a chain e and a support rod f to prevent the vehicle from overturning completely.

However, in such a test device, the vehicle c
Because the state immediately before the rollover and the inclination angle of the ramp b are visually determined and measured, errors are likely to occur. In particular, in the case of a long vehicle such as a trailer, due to the structure of the vehicle, the vehicle rolls over, and the lifting of one wheel of the vehicle from the ramp b, which is the standard for stability measurement, does not occur at the same time for all wheels. Accurate measurements are not possible with conventional test equipment. Additionally, chains and the like are used to prevent the vehicle from completely overturning during testing, but this has the disadvantage that the impact is transmitted to the vehicle because the vehicle suddenly undergoes a large displacement immediately after the critical rollover angle is exceeded. Ta.

In view of the above, it is an object of the present invention to provide a device that can test the stability of a vehicle with extremely high accuracy and safety even in a long vehicle such as a trailer. A vehicle under test is placed on a tilting table with variable pressure, and a plurality of supports having pressure detectors at the tips and having variable lengths of protrusion toward the side of the vehicle are arranged along the length direction of the vehicle. The protruding length of the support part is adjusted according to the inclination angle of the ramp so that it does not come into contact with the side surface of the vehicle, and the support part is configured to detect pressure caused by pressure contact with the side surface of the vehicle due to tilting of the vehicle. In response to the output from the support unit, the corresponding support part is controlled to shorten its protrusion length by a predetermined length, and when the outputs of all the pressure sensors of the plurality of support parts are generated, the tilt table The tilt angle of the tilt table is measured by a tilt angle meter installed in the tilt angle meter.

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3. The basic configuration of the test apparatus according to the present invention includes a tilting table 2 on which a vehicle under test is placed and whose tilting angle is controlled, and a tilting table 2 whose tilting angle is similarly variable on the rotation (tilting) fulcrum side of the tilting table 2. A receiving plate 5, a plurality of supports 9 are installed along the length direction (of the vehicle) of the receiving plate 5, the protruding length thereof is variable, and a pressure sensor 10 is provided on the surface side. It is something.

More specifically, one end of the tilt table 2 is supported on the base 1 side, and its tilt angle is adjusted by the angle adjustment means 6. The angle adjusting means 6 may be constructed by pivoting the tip of a rod 6b of a hydraulic cylinder 6a swingably attached to the lower surface of the concave base 1 to the lower surface of the inclined table 2 so as to be rotatable. Similarly, the receiving plate 5 is also attached to the base 1.
The angle of inclination is adjusted by angle adjusting means 7, which is constructed by pivotally pivoting the tip of a rod 7b of a hydraulic cylinder 7a swingably mounted on the receiving plate 5. For example, a conventionally known inclination angle meter 4 consisting of a pointer always pointing straight down and a scale plate is installed on the inclination table 2. Further, the receiving plate 5 is provided with a plurality of supporting portions 9 along the length direction of the vehicle 3 placed thereon, and the supporting portions 9 include, for example, cylinders 13 provided on the receiving plate 5.
The rod is fixed at the tip of the rod, and is set at predetermined short distance intervals according to a signal from the control section 8, as will be described later. That is, the control section 8 has the function of receiving a signal from the pressure sensor 10 and outputting it to the AND gate circuit 12, as well as outputting an output for retracting the rod of the cylinder 13 by a predetermined amount.

Next, the operation of the above device will be explained. FIG. 3 is a schematic top view of an example in which a long trailer or the like is tested. First, two inclined tables 2, 2'
(Of course, one car is fine, but considering the long overall length, two cars are used.) Place the vehicle on top of the car. These two inclined tables 2 and 2' are assumed to be synchronously interlocked. The receiving plate 5 tilts in response to the rotation (tilting) of the ramp 2 while holding an angle substantially perpendicular to the ramp 2, for example, and connects the control units 8a to 8d and the hydraulic cylinder along the length direction of the vehicle. 13a to 13d and support parts 9a to 9
d. The protruding lengths of the four support parts 9a to 9d are set so that the distance from the side surface of the vehicle is appropriate. Next, the tilt angle of the tilt table 2 is increased. Then, when a certain inclination angle is reached, some of the wheels 11a to 11d on one side of the trailer, for example, only the wheel 11a, lifts off the incline 2, and the side of the vehicle body on the opposite side hits the support part 9a. . However, since the other wheels 11b to 11d are not lifted up yet, the corresponding support parts 9b to 9d
is not in contact with the side of the vehicle body. Therefore, the support part 9
An output is generated in the pressure sensor 10a provided at
The protruding length of the support portion 9a is shortened by a predetermined length via the support portion 3a. After that, when the inclination angle is further increased, another vehicle, for example 11b, lifts off the ramp 2, and the side of the vehicle hits the support part 9b, so the pressure sensor 10b produces an output, and the pressure sensor 10b generates an output according to the command from the control part 8b. The cylinder 13b is driven to shorten the protruding length of the support portion 9b by a certain amount.

The same operation is repeated, and when all the pressure sensors 10a to 10d of the support parts 9a to 9d produce outputs, that is, all of the wheels 11a to 11d on one side of the trailer have moved away from the ramp 2 by a predetermined amount. When this happens, the AND gate circuit 12 produces an output. The inclination angle of the ramp 2 at this time serves as a standard measure of the rollover stability of the vehicle, and in response to this output, the inclination angle meter 4 measures the inclination angle of the ramp 2 by other means. If measured, highly accurate stability tests will be possible. Further, the AND gate circuit 12
The cylinders 13a to 13 are hydraulically locked via their respective controls 8a to 8d, and all the supports 9a to 9d are then fixed without retreating to prevent the vehicle or trailer from tipping over. Accept that aspect.

In the above explanation, the tilting table 2 and the receiving plate 5 are assumed to be separate, and the inclination angle is controlled individually. They may be integrated in a similar positional relationship, and the angular relationship between the two can be set arbitrarily. Further, the receiving plate 5 is not necessarily required, and the supporting part 9 is connected to the base 1,
Of course, it is also possible to extend the length from other sources and gradually shorten the length as a substitute.

As described above, according to the present invention, it is possible to accurately measure the angle of inclination when all wheels on one side are released from the inclination even in a long vehicle such as a trailer. Since the sides are always supported by the support, testing can be carried out safely, and furthermore, remote operation and centralized control are possible.

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of a conventional stability test device, and FIGS. 2 and 3 are a side view, a top view, and a circuit diagram of the vehicle stability test device according to the present invention. 2... Inclination platform, 3... Vehicle, 4... Inclination angle meter, 8...
Control section, 9... Support section, 10... Pressure detector.

Claims (1)

[Claims] 1 A ramp with a tilt angle meter on which the vehicle under test is placed to vary the tilt angle, a plurality of cylinders arranged at predetermined intervals on the sides of the ramp, and rods for each of these cylinders. A support part having a pressure sensor provided at the tip and activated by contact with the side surface of the vehicle under test, and a rod of the support part having a pressure sensor that receives output from each pressure sensor is shortened by a predetermined length. 1. A vehicle stability testing device comprising: a control section that outputs a control signal to the cylinder of the rod; and an AND gate circuit that inputs an output from the control section that receives an output from a pressure detector.