JPH0216279Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vehicle stability testing device that can accurately measure the stability of a vehicle, particularly the critical angle for rollover.

Conventionally, vehicle stability tests are carried out by placing the vehicle on a ramp, gradually tilting the ramp, and measuring the tilt angle at which all wheels on one side of the vehicle are off the ramp. This angle is taken as the above-mentioned critical angle. However, when the vehicle length is long, such as a trailer, or when several vehicles are connected, it is impossible to artificially read the tilt angle at the moment when all wheels on one side of the vehicle leave the ramp at the same time. It is extremely difficult.

Therefore, a vehicle stability testing device that solves this problem has been proposed in the applicant's previous application (Japanese Patent Application No. 166342/1983 - Japanese Patent Application Laid-open No. 56144/1983). In this device, the vehicle under test is placed on a ramp with a variable tilt angle, and a supporting section with a variable protruding length equipped with a pressure sensor at the tip is placed facing the side of the vehicle and runs along the length of the vehicle. It has a configuration in which a plurality of them are arranged. When the inclination angle of the ramp becomes large and the side of the vehicle hits one of the supports and a detection output is generated from the pressure sensor, the protruding length of the support of the pressure sensor is controlled so as to be shortened by a predetermined length. , the inclination angle of the tilting table is read electrically or mechanically when the outputs of all the pressure sensors of the plurality of support parts are generated.

Incidentally, for accurate stability testing, it is necessary to keep the opposing distance between the side of the vehicle and the support part constant until all the sides of the vehicle come into contact with the support part. In the above device, after the pressure detector of the support portion detects the pressing force due to contact with the side surface of the vehicle, the protrusion length of the support portion is shortened by a certain distance. In other words, since the protruding length of each support part changes discontinuously, the time required for the side of the vehicle to come into contact with all of the support parts is inevitably long, making it difficult to conduct a quick test. be.

The present invention aims to provide a vehicle stability testing device as described above, in which the protruding length of the supporting portion can be continuously controlled so that the facing distance between the supporting portion and the side surface of the vehicle is always a constant distance. The vehicle under test is placed on a ramp with a variable inclination angle, and the distance from the side of the vehicle facing the vehicle is variable. A plurality of support parts each having a pressure gas flow passage with a leak hole are arranged along the length of the vehicle, and each support part is provided with pressure for detecting the back pressure of the gas leaking from the outlet of the flow passage. a control unit that generates a control signal that makes the opposing distance constant according to the difference between the pressure detected by the pressure gauge and a predetermined reference pressure; and a control unit that advances or retreats the support portion in response to the control signal. is provided, and the input side of the AND gate is connected to the output side of all the pressure detectors of the plurality of support parts.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows the configuration of the main parts of the vehicle testing device according to the present invention. A sealed space 104 is provided in the hard plates 101 and 102 of the support part 1, and the hard plate 101 is provided with a buffer plate 103 made of rubber or the like.
are provided, and a plurality of holes 1 are provided in the thickness direction of these holes.
07 is formed to communicate with the sealed space 104. In addition, the sealed space 104 has a supply port 1 on one side.
Pressure gas, that is, air, is supplied from 05 toward the outlet 106. The protruding length of the support portion 1 is adjusted by the expansion and contraction of a rod 5 connected via a universal joint 3. The rod 5 is the control section 11
The support plate 4 is moved in the horizontal direction by a drive unit 6 such as a hydraulic cylinder driven in response to a control signal from the support plate 4, and the support plate 4 is fixed to a rod 5 and moves with the movement of the support unit 1. One ends of horizontal rods 8a and 8b, which pass through the support plate 4 and the guide 9, are connected to the hard plate 102.

The side surface 15a of the vehicle and the support part 1 are separated by a distance l, and part of the air flowing in from the inlet 105 of the sealed space 104 of the support part 1 leaks from the hole 107 provided in the hard plate 101 and the cushion 103, and the rest leaks. It flows into the pressure gauge 2. As the distance 1 becomes longer, the amount of leakage from the hole 107 increases, and the pressure measured by the pressure gauge 2 decreases. On the other hand, when the distance 1 becomes smaller, the side surface 15a of the vehicle facing the hole 107 prevents air from leaking through the hole 107, so that the measured pressure becomes higher. This is the principle of what is called an air micrometer. Therefore, the required facing distance l is determined in advance, and the air pressure obtained at that time is set in the control unit 11 as a reference value, and the pressure obtained by the pressure gauge during the vehicle stability test is used as the reference value. If the pressure becomes higher than the pressure, a control signal is sent from the control section 11 to the drive section 6, and the rod 5 is moved by a length corresponding to the difference between the two pressures.
to shorten the protruding length of the support part 1. Conversely, when the air pressure is lower than the reference value, the support portion 1 is made to protrude. In this way, the outlet 106
If the air pressure from the support plate is constantly monitored by the pressure gauge 2 and the protruding length of the support plate is changed in accordance with the measured pressure value, a constant facing distance can be maintained at all times. Furthermore, since this control is performed continuously according to the measured pressure, quick and accurate control is possible. In FIG. 1, 7a and 7b indicate springs for weakening the impact force when the vehicle side surface 15a collides with the support portion 1. Further, 10a and 10b are vertical rods for positioning the guide 9, and are used to maintain a constant positional relationship when a plurality of control units as described above are arranged in one direction.

FIG. 2 is a schematic top view of an example in which a long trailer or the like is tested. A vehicle 15 is placed on two inclined tables 14, 14 which are synchronously interlocked. Four supports 1 are provided along the length of the vehicle 15.
a to 1d are installed, and these supporting parts are connected to the inclined table 1.
It is incorporated into a receiving plate or the like so that the angle is controlled in conjunction with the inclined surfaces 4 and 14 so that the angle between the two is always approximately a right angle. Pressure detectors 12a to 12d corresponding to each of the support parts 1a to 1d,
Drive unit 6 such as rods 5a to 5d and hydraulic cylinders
a to 6d, pressure gauges 2a to 2d, control units 11a to 1
1d is provided.

As the inclination angle of the ramps 14, 14 is increased, when a certain angle is reached, only some of the wheels 16a to 16d on one side of the vehicle 15, for example, the wheel 16a, lifts off the ramp 14. Then, the opposite side surface 15a of the vehicle body approaches the support portion 1a. At this time,
Since the other wheels 16b to 16d have not yet been lifted up, the distance between the corresponding support portions 1b to 1d and the vehicle body side remains unchanged. Therefore, the pressure gauge 2a
The air pressure measured at is greater than the reference value, and the pressure difference is input to the control unit 1a, and the air pressure is
The drive unit 6a is controlled to shorten the length of a. After that, when the inclination angle of the ramps 14, 14 further increases, the other wheels lift up and the same control as above is performed, and in the end, only when all the wheels 16a to 16d lift up at the same time do all the pressure sensors 12a to 12d
The output reaches the AND gate 13, and the tilt angle of the ramps 14, 14 at which the output occurs is obtained by various mechanical and electrical means.

In the above explanation, if the time required from the gas detection by the pressure gauge 2 to the control of the support parts by expansion and contraction of the rod 5 is about the same as or shorter than the vehicle rollover time, the side of the vehicle will come into contact with all the support parts at the same time. However, considering the flow rate of gas, that is, air, and the response speed of the drive unit by the hydraulic system, the above-mentioned time is long compared to the rollover speed of the vehicle, so such a fear does not occur.

FIGS. 3 and 4 show another embodiment, in which in each support part 1 there are four drive parts 6...6, two on each side of the support body 14, and corresponding thereto, respectively. Sealed space section 104...10
4 and holes 107...107 that communicate with these, respectively.
and control sections 11...11, forming a control loop for each drive section 6, and by the same operation as in the previous embodiment, a, b, shown in FIGS. 3 and 4,
Vehicle 1 is controlled so that the distances c and d are equal.
The side surface 15a of 5 can be received more safely.

As described above, in the vehicle stability test device according to the present invention, a sealed space is provided in the support part, a predetermined number of holes communicating with the sealed space are provided on the side of the support part opposite to the side surface of the vehicle, and the sealed space is By supplying pressure gas from one side and measuring the pressure of the gas flowing out from the other side, the opposing distance between the support plate and the side of the vehicle can be determined, and the support plate can be moved depending on the magnitude of the pressure. With this configuration, the facing distance between the support plate and the side surface of the vehicle can be continuously maintained at a constant value, so that a stability test of the vehicle can be carried out quickly and accurately.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing the main structure of one example of the device of the present invention, Fig. 2 is a schematic diagram of the device showing one embodiment of the invention, and Fig. 3 is the main structure of another example. FIG. 4 is a partially sectional plan view showing a part of the structure. 1... Support part, 2... Pressure gauge, 6... Drive part,
11...Control unit, 12...Pressure detector, 13...
AND gate, 14,14...slope, 15...
Vehicle, 15a... side, 104... sealed space,
107...hole.

Claims (1)

[Scope of utility model registration request] The vehicle under test is placed on a ramp whose tilt angle is variable, the distance from which it faces the side of the vehicle is variable, it has a pressure detector, and a leak hole is provided on the side facing the vehicle for pressure gas flow. A plurality of support parts each having a passageway are disposed along the length direction of the vehicle, and each support part is provided with a pressure gauge for detecting back pressure of gas leaking from the outlet of the flow passageway, and a pressure gauge detected by the pressure gauge. and a control section that generates a control signal that makes the opposing distance constant according to the difference between the pressure and a predetermined reference pressure, and a control section that advances or retreats the support section in accordance with the control signal, and A vehicle safety testing device characterized in that the input side of an AND gate is connected to the output side of all pressure detectors in the support section.