JPH037882B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a road vertical alignment measuring device that is mounted on a vehicle and measures the amount of change in height of a road surface while the vehicle is running.

[Conventional technology]

Optical methods for measuring the transverse elevation (rutting) of a road surface and local elevation in the direction of travel have already been put into practical use while the vehicle is running.

However, even if the road surface elevation alignment in the direction of road travel is made as designed at the time of completion, after a certain period of time, due to the subsidence of the road surface due to soft ground, heavy loads, etc. Changes in height may occur.

This type of undulation-like height change causes abnormal vibrations of the traveling vehicle, and is often a problem because it is related to ride comfort, such as so-called car sickness.

Conventionally, in order to measure the amount of the undulating road surface height, it has either been done indirectly by measuring changes in the height of the guardrail using a surveying method, or directly measuring the driving road surface after regulating road traffic. There is. As a result, measurement results may be inaccurate, and road traffic regulations require a great deal of time and manpower.

Furthermore, as disclosed in Japanese Patent Publication No. 48-16573, there is also known a road surface unevenness measuring device in which a displacement measuring device equipped with measuring wheels in contact with the road surface and a displacement detector is attached to a running vehicle. . However, in the case of this road surface unevenness measuring device, the measuring wheels of the displacement measuring device are in contact with the road surface, so when the traveling wheels are driven at high speed, the displacement measuring device bounces due to the unevenness of the road surface, and the measuring wheels are brought into contact with the road surface. There is a problem in that the vehicle moves away from the road surface, making it impossible to accurately measure road surface irregularities while the vehicle is running at high speed.

[Purpose and structure of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a road vertical alignment measuring device that is mounted on a running vehicle and can continuously measure and store the amount of depression in the longitudinal direction of a road surface with high efficiency, accurately, and automatically while the vehicle is running. A road surface height measuring device 3 consisting of a non-rotating accelerometer 1 and a non-contact vehicle height meter 2 for measuring vertical deviation with respect to a road surface 9 is fixed to a vehicle body 4, and its acceleration is measured. Total 1 and vehicle height meter 2 are connected to the input section of a calculation circuit 5 that calculates the displacement ΔH based on the acceleration signal of accelerometer 1 and the vehicle body height a based on the signal of vehicle height meter 2, and calculates the difference between them. The first invention is a road vertical alignment measuring device characterized in that a storage device 6 is connected to the output part of the arithmetic circuit 5, and a non-rotating type measuring device for measuring vertical deviation with respect to a road surface 9. A road surface height measuring device 3 consisting of an accelerometer 1 and a non-contact vehicle height meter 2 is fixed to the vehicle body 4. and the vehicle body height a based on the signal from the vehicle height gauge 2, and calculate the difference between them.
, a storage device 6 is connected to the output portion of the arithmetic circuit 5, and a wave circuit 7 is interposed between the accelerometer 1 and the storage device 6. A second invention is a linear measuring device.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

FIGS. 1 and 2 are schematic diagrams showing the installed state of the road longitudinal linearity measuring device, in which a non-rotating accelerometer 1 measures vertical deviation with respect to the road surface 9.
and a non-contact ultrasonic distance meter (vehicle height meter) 2 that measures the height of the vehicle body.
is fixed to the vehicle body 4 at a position on the center line in the width direction of a vehicle such as an automobile and close to the axle 8, furthermore, an amplification calculation storage device 14 is mounted on the vehicle body 4, and the vehicle height meter 2 is mounted below the accelerometer 1. The vehicle height gauge 2 measures the distance from the vehicle height gauge position to the road surface 9, that is, the vehicle body height a.

FIG. 3 is a block diagram showing the configuration of a road longitudinal alignment measuring device, in which the accelerometer 1 is connected to the input section of the arithmetic circuit 5 via the amplifier circuit 10 and the wave circuit 7, and the vehicle height meter 2 is connected to the input section of the arithmetic circuit 5. It is connected to the input part of the arithmetic circuit 5 via the circuit 11, and further connected to the input part of the arithmetic circuit 5.
A storage device 6 and a storage device 12 each having a display device are connected to the output section of.

The vertical acceleration signal detected by the accelerometer 1 is amplified by an amplifier circuit 10, then waved by a filter circuit 7, and then sent to the input section of an arithmetic circuit 5, where the acceleration signal is The displacement amount ΔH at the position where the accelerometer 1 is fixed in the vehicle body 1 is calculated by integrating twice.

On the other hand, the vehicle body height data detected by the vehicle height meter 2 is amplified by the amplifier circuit 11 and then sent to the arithmetic circuit 5, where the vehicle body height a is calculated.

The difference δ between these displacement amounts ΔH and the change amount Δa in the vehicle body height a indicates a depression in the road surface.

Figure 4 shows the calculated vertical changes ΔH of the vehicle body, changes Δa in the vehicle body height, and amount of depressions δ in the road surface, with the traveling distance as the horizontal axis. can be known.

Since the absolute altitude H of the part of the vehicle body 4 where the accelerometer 1 is fixed includes the amount of change in the height of the road surface,
As shown in Fig. 5, for example, in the case of a slope where the altitude increases linearly by H _B - H _A during the distance l from the starting point A to the point B, the position is l ₁ away from the starting point A. If a depression occurs in the area between and a position further l ₂ away from that position, a graph sloping upward to the right with the maximum depression amount δ ₁ will be drawn in that area, as shown in Figure 5. Become. In the case of a downward slope, on the other hand, a graph descending to the right will be drawn, and if both are recorded continuously, the graph will come off the recording paper, which is inconvenient.

In addition, in general, expressways are designed with a radius of curvature of several thousand to several tens of thousand meters so that there is no problem with the speed limit (80 to 100 km/h). Acceleration based on longitudinal linear changes has an extremely low frequency compared to acceleration based on other causes.

Furthermore, even if small irregularities on the road surface are absorbed by tires and springs,
The frequency is relatively high. The period t due to depressions in the road surface due to subsidence, etc., is, for example, when the speed is 100 km/h and there are undulations of 10 m to 100 m pitch, V (seconds) = 100 x 1000/60 x 60 ≒ 30 m/S t =P/V=10~100/30=0.33~3.3sec That is, the period t is about 3~0.3Hz.

Therefore, by cutting out the extremely low frequency and high frequency waves in the measured acceleration by the wave circuit 7 shown in Figure 3, and calculating ΔH - Δa, the amount of depression in the longitudinal direction of the road surface that was not anticipated at the time of design can be calculated. (Amount of defects)
δ can be obtained.

At the same time, when continuous recording is performed by the recording device 12 connected to the arithmetic circuit 5, it is possible to record the amount of depression with respect to the horizontal reference line with the initial road vertical linear variation amount as 0 (see Fig. 6). reference).

The amount of depression in the road surface δ calculated as described above is recorded as a digital amount on a cassette tape or magnetic disk in the storage device 6 at the same time as the time data by the timer.

These data are printed out by the recording device 12 as a graph of distance L versus depression amount δ as shown in FIG. , Δa, δ, etc. are displayed digitally.

A control device 13 connected to the arithmetic circuit 5 is used to input peripheral conditions necessary for calculation into the arithmetic circuit 5, and inputs the initial conditions at the start of measurement, such as data such as the initial altitude and slope of the road surface. Data and the like for error correction during running are input into the arithmetic circuit 5 by key operations on the control device.

In FIG. 3, the wave circuit 7 is replaced by an amplifier circuit 10.
and the arithmetic circuit 5, but the wave circuit 7 is not interposed at that position and the arithmetic circuit 5
and the storage device 6.

Note that since the vertical accelerometer measures acceleration in a direction perpendicular to the road surface, the absolute altitude H based on this measurement value is accompanied by an error due to the road surface inclination θ. However, since the road surface gradient on expressways is generally about 6% at maximum, the error is small and does not pose a problem in practice.

Also, when the road surface has a curve in the longitudinal direction, the centrifugal force based on it acts as acceleration, and this is also added as an error, but since the longitudinal radius of curvature on expressways is usually an extremely large value of 1000 to 10000 m, The error is also small and does not pose a problem in practice.

〔Effect of the invention〕

According to this invention, a road surface height measurement device 3 consisting of a non-rotating accelerometer 1 and a non-contact vehicle height meter 2 for measuring vertical deviation with respect to a road surface 9 is fixed to a vehicle body 4, and What is accelerometer 1 and vehicle height meter 2?
connected to an input part of an arithmetic circuit 5 that calculates the displacement amount ΔH based on the accelerometer signal of the accelerometer 1 and the vehicle body height a based on the signal of the vehicle height meter 2, and calculates the difference between them;
Since the storage device 6 is connected to the output section of the arithmetic circuit 5, simply by driving the vehicle equipped with the road vertical alignment measuring device, the non-rotating accelerometer 1 and the non-contact type vehicle By combining height meter 2, it is possible to automatically and accurately measure and display the amount of dent in the road surface. In particular, in the case of this invention, since the non-contact type vehicle height meter 2 is used, the vehicle body height a can be accurately measured even when the vehicle equipped with the road vertical alignment measuring device is running at high speed. . In addition, by storing the road vertical alignment using the device when the road is completed, and comparing the memorized road vertical alignment with the memory of the road vertical alignment obtained by the device again several years later, it is possible to easily detect abnormalities such as ground subsidence. It is possible to know the location and amount of subsidence, which can save a lot of effort, cost, and time in road management. Furthermore, by interposing the wave circuit 7 between the accelerometer 1 and the memory circuit 6, the wave circuit 7 can cut out very low frequencies and high frequencies in the measured acceleration. When continuously recording the amount of dents (defects), the initial road longitudinal linear variation can be set to 0, that is, the horizontal reference line, and the amount of dents can be recorded as the amount of change with respect to the horizontal reference line. , it is possible to achieve the effect of being able to perform continuous recording without protruding from the recording paper.

[Brief explanation of the drawing]

Figure 1 is a side view of a vehicle equipped with a road vertical alignment measuring device, Figure 2 is a rear view of the vehicle, Figure 3 is a block diagram showing the configuration of the road vertical alignment measuring device, and Figure 4 is an accelerometer and vehicle height. Figure 5 is a graph showing the relationship between distance and the amount of change in road surface height;
FIG. 6 is a graph showing the amount of depression in the road vertical line with respect to the horizontal reference line, assuming that the initial road longitudinal line change amount is 0. In the figure, 1 is an accelerometer, 2 is a vehicle height meter, 3 is a road surface height measuring device, 4 is a vehicle body, 5 is an arithmetic circuit, and 6
1 is a storage device, 7 is a wave circuit, 8 is a vehicle, 9 is a road surface, 10 and 11 are amplifier circuits, 12 is a recording device, and 13 is a control device.

Claims (1)

[Scope of Claims] 1. A road surface height measuring device 3 comprising a non-rotating accelerometer 1 and a non-contact vehicle height meter 2 for measuring vertical deviation with respect to a road surface 9 is fixed to a vehicle body 4, The accelerometer 1 and the vehicle height meter 2 are input parts of the arithmetic circuit 5 that calculates the displacement ΔH based on the acceleration signal of the accelerometer 1 and the vehicle body height a based on the signal of the vehicle height meter 2, and calculates the difference between them. A road vertical alignment measuring device characterized in that a storage device 6 is connected to an output section of the arithmetic circuit 5. 2. A road surface height measurement device 3 consisting of a non-rotating accelerometer 1 and a non-contact vehicle height meter 2 for measuring vertical deviation with respect to the road surface 9 is fixed to the vehicle body 4, and the accelerometer 1 and the vehicle The height meter 2 is connected to the input part of the arithmetic circuit 5 that calculates the displacement amount ΔH based on the acceleration signal of the accelerometer 1 and the vehicle body height a based on the signal of the vehicle height meter 2, and calculates the difference between them. A storage device 6 is connected to the output part of the circuit 5, and the accelerometer 1
A road vertical alignment measuring device characterized in that a wave circuit 7 is interposed between the and the storage device 6.