JPH06160078A - Method for measuring lateral/longitudinal irregularities of road surface - Google Patents

Abstract

PURPOSE:To obtain the lateral irregularity amount and the longitudinal irregularity amount based on a plurality of the heights of the road surface from a reference plane in the lateral crossing direction of the road surface. CONSTITUTION:At least three vertical displacement gages, which measure the distances (heights of a road surface) HL, HC and HR from a reference plane 15 to a road surface 20, are mounted on a vehicle along the orthogonal direction with respect to the advancing direction of the vehicle. The measured values are acquired from at least three vertical displacement gages 10a, 10b and 10c for every specified running distance of the vehicle. Thus, the irregularity amounts in the lateral direction surface are computed.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention is directed to crossing and longitudinal cutting of a road surface.
About the method to measure ▼ ▲ and ▼ at the same time,
The road surface height (distance from the reference surface to the road surface) is obtained for each predetermined vehicle travel distance from a plurality of vertical displacement gauges provided at right angles to the traveling direction of the vehicle, and crossing / longitudinal section of the road surface is obtained from the same road surface information. Regarding the method of measuring Totsu.

[0002]

2. Description of the Related Art Conventionally, various measuring methods for crossing a road surface have been known. For example, a bright line (laser light) is formed on a road surface by a laser light generator mounted on a vehicle, the bright line is photographed by a pulse camera or a television camera mounted on the same vehicle, and based on information obtained by the photographing. A method for measuring the crossing of a road has been proposed. This method crosses the road without interrupting traffic ▲
Although it has the advantage of being able to measure ▼ ▲ and ▼, it has the disadvantage that road surface measurement is limited to nighttime, and that it requires that you manually cross ▲ and ▼ from the photographed information. There are also problems. Furthermore, the information from the white line (lane mark) for lane marking is mixed in the shooting information, making it difficult to measure the crossing.

On the other hand, the measurement (flatness measurement) of a road surface longitudinal section is carried by mounting a measuring device based on the principle of a three-point profilometer in a vehicle, and letting the vehicle run to make a road surface longitudinal section. It is carried out by measuring the amount and measuring the measured value in a certain section statistically to obtain the standard deviation. Further, a method has also been proposed in which a fifth wheel is provided on a four-wheeled vehicle, and the vertical displacement or acceleration of the fifth wheel is measured to measure the road surface vertical section.

[0004]

A road surface longitudinal profile ▲ ▼ ▼ ▲ totsu ▼ is defined based on an irregular shape in the longitudinal direction of the road surface which is generated in a ring portion (rudder part) due to use of the road. It is a scientific quantity. Therefore, the longitudinal section of the road
The measured value for determining the tot ▼ should be combined with the measured value for the road crossing ▲ ou ▼ ▲ totsu ▼ (rut, etc.).

A conventional measuring system using a road surface property measuring vehicle is intended to simultaneously measure a cross section and a vertical section of a road surface at the same time. Totsu ▼ Measuring device and vertical section ▲ ou ▼ ▲ Totsu ▼ Measuring device is installed in the same vehicle and the actual situation is to make individual measurements. In other words, there was no relation between the two types of measurement values for the crossing of the road surface and the longitudinal section.

[0006] Therefore, crossing and longitudinal crossing of the road surface
The measurements of (1) and (2) overlap, and the measured values are inconsistent. Therefore, there is a problem that the road surface property evaluation by these two types of measurement is not accurate. In other words, using the same road surface measurement value, crossing the road surface
Until now, no method has been proposed for measuring both ▼ ▲ and ▼.

[0007]

In order to solve the above-mentioned conventional problems, the present invention uses a measurement value obtained from a plurality of vertical displacement gauges mounted on a vehicle to cross a road surface.
Along with Totsu, I also asked for a vertical section, ▲ Ou ▼ ▲. According to the present invention, at least three vertical displacement gauges for detecting a road surface height from a reference surface to a road surface are mounted on a vehicle along a direction perpendicular to a traveling direction of the vehicle, and the vehicle is installed at every predetermined traveling distance of the vehicle. In addition, the detection results are fetched from the at least three vertical displacement gauges, and the vertical cross section ‘L’ and ‘L’ can be calculated together with the crossing of the road.

[0008]

Embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating a method of detecting (measuring) road surface heights at three locations in a transverse direction of a road surface by a plurality of vertical displacement gauges mounted on a vehicle. FIG. 2 is a diagram showing how information indicating the road surface height in the transverse direction is taken in from a plurality of vertical displacement gauges arranged in the transverse direction of the road surface for each predetermined distance in the vehicle traveling direction.

As shown in FIGS. 1 and 2, the vertical displacement meter 1
0a to 10c indicate the traveling direction of the vehicle 14 (arrow 1 in FIG. 2).
It is mounted on the vehicle 14 along a direction perpendicular to 2). That is, the vertical displacement gauges 10a, 10b, and 10c are attached to the left wheel trace portion, the right wheel trace portion, and the center portion between the left and right wheel trace portions of the vehicle 14, respectively. The wheels are not shown in FIG.

The vertical displacement meters 10a to 10c themselves are known, and a reference plane 15 (straight line 1) is formed by using laser light, ultrasonic waves, or the like.
A signal representing the distance from the surface including 6 and 18) to the road surface is output. That is, the vertical displacement meter 10a measures the distance (road surface height) HL from the reference surface 15 to the road surface 20 at the left wheel mark portion of the vehicle 14.
The vertical displacement meter 10b outputs a signal indicating that the distance from the reference surface 15 to the road surface 20 at the right wheel mark portion of the vehicle 14 (road surface height).
A signal representing HR is output. On the other hand, the vertical displacement meter 10c outputs a signal indicating the road surface height HC at the center between the left and right wheel traces of the vehicle 14 from the reference plane.

For convenience of explanation, a straight line parallel to the straight line 16 and passing through the road surface at the center between the left and right wheel traces is designated by reference numeral 2.
2 shows.

As shown in FIGS. 1 and 2, three vertical displacement gauges 10a to 10c are mounted on a vehicle 14, and the displacement gauge 1 is arranged at predetermined distance intervals (150 cm or less) according to the traveling of the vehicle 14.
The signals from 0a to 10c are fetched and stored in an appropriate storage means. It should be noted that since the information can be fetched from the displacement gauge for each predetermined traveling distance of the vehicle by a known means, description thereof will be omitted. Vertical displacement gauge 10 at any measurement point i
The signals from a to 10c are sent to HLi, HRi, and HCi, respectively.
Then, the measured values stored in the storage means are ..., HLi-n, ..., HLi, ..., HLi + n,
..., HRi-n, ..., HRi, ..., HRi + n,
..., HCi-n, ..., HCi, ..., HCi + n,
... (n is a positive integer).

After the measurement run of the vehicle is completed, the above-mentioned data stored in the storage means is used to measure the amount of crossing and longitudinal crossing of the road surface.

First, crossing the road surface at the measurement point i
Regarding totsu ▼, cross the left wheel trace part ▲ ou ▼ ▲ totsu ▼ amount D
Li is DLi = HCi-HLi ・ ・ ・ Number 1 Crossing the right wheel trace part ▲ u ▼ ▲ totsu ▼ Quantity DRi is DRi = HCi-HRi ・ ・ ・ Numerical 2 Total crossing ▲ ou ▼ ▲ totsu ▼ Quantity Di is , Di = (DLi + DRi) / 2 ... Equation 3 is obtained.

Next, the extension direction of the road (the traveling direction of the vehicle)
Since the flatness of the road is defined by the standard deviation of a number of vertical crossings measured over a certain distance section, the previously calculated amount of vertical crossings is used. Is calculated for each of the above sections. That is, the standard deviation of the vertical section within a given section is the crossing within the section.
Since it is equal to the standard deviation of the amount, the flatness of any section is generally

[Equation 4] Can be obtained with.

Further, from the N cross-sections of the road surface, the average rutting depth of the left and right wheel tracks, the average rutting depth of the entire wheel, the flatness of the left and right wheel tracks, and the overall flatness are as follows. Can be asked. That is, the amounts of left and right wheel traces in N cross sections are respectively DLi, DRi (i =
1, 2, ..., N), the average rutting depth of the left wheel trace is

[Equation 5] The average rut depth of the left wheel trace is given by

[Equation 6] The overall average rutting depth is given by

[Equation 7] Given by. On the other hand, the flatness of the left wheel trace is

[Equation 8] The flatness of the right wheel trace is given by

[Equation 9] The overall flatness given by

[Equation 10] Given by.

In the above description, three vertical displacement gauges are used, but if four or more displacement gauges are used, it is possible to more accurately obtain the transverse and vertical sections. . Incidentally, the calculation of the road crossing / longitudinal cross section after obtaining the road surface height information from the vertical displacement gauge is known.

[0018]

According to the present invention, the following remarkable effects can be obtained. (a) Crossing ▲ ou ▼ ▲ totsu ▼ and vertical section ▲ ou ▼ ▲ totsu ▼
No dedicated device is required for each measurement. In other words, since the road crossing and the vertical section can be measured from the same measurement value, there is no duplicate measurement. Therefore, there is no possibility of inconsistency in each measurement. (b) It is extremely easy to calculate the vertical profile of each of the left and right wheel traces, and the comprehensive vertical profile. (c) Since a vertical displacement meter is used, it is possible to measure day and night, and it is possible to use a lane marking to mark the bright line on the road surface with a laser beam as in the conventional example. The measurement result is not adversely affected. (d) High-speed and high-density measurement is possible. (e) It is possible to measure the crossing and longitudinal section of a large extension road at once.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the present invention.

FIG. 2 is a diagram for explaining the present invention.

[Explanation of symbols]

 10a-10c: Vertical displacement meter 14: Vehicle 15: Reference plane 20: Road surface

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[Procedure amendment]

[Submission date] May 20, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Method for measuring crossing / longitudinal unevenness of road surface

[Claims]

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to crossing and longitudinal cutting of a road surface.
Regarding the method of simultaneously measuring unevenness , in particular, the road surface height (distance from the reference surface to the road surface) is obtained from a plurality of vertical displacement gauges provided at right angles to the traveling direction of the vehicle, and the same road surface is obtained. The present invention relates to a method for measuring crossing / longitudinal unevenness of a road surface from information.

[0002]

2. Description of the Related Art Conventionally, various measuring methods of road surface unevenness have been known. For example, a bright line (laser light) is formed on a road surface by a laser light generator mounted on a vehicle, the bright line is photographed by a pulse camera or a television camera mounted on the same vehicle, and based on information obtained by the photographing. Road cross recess
A method of measuring convexity has been proposed. This method has an advantage that the road surface unevenness can be measured without interrupting the traffic. However, in addition to the drawback that the road surface measurement is limited to nighttime, the road surface unevenness must be manually obtained from the photographed information. There is also a problem. Furthermore, the information from the white line (lane mark) for lane marking is mixed in the shooting information and crosses.
It was difficult to measure unevenness .

On the other hand, in the measurement of the road surface vertical unevenness (flatness measurement), a measuring device based on the principle of a three-point profilometer is mounted on a vehicle, the vehicle is run to measure the amount of road surface vertical unevenness , and a fixed section is measured. It is carried out by statistically processing the measured value of to obtain the standard deviation. Further, a method has also been proposed in which a fifth wheel is provided on a four-wheel vehicle and the vertical displacement or acceleration of the fifth wheel is measured to measure the road surface vertical unevenness .

[0004]

[Problems to be Solved by the Invention] Road surface unevenness is a geometrical amount defined on the basis of an irregular shape in the road surface longitudinal direction (rudder part) that occurs along the use of a road. . Therefore, the measured value for obtaining the road surface vertical unevenness should be combined with the measured value of the road surface unevenness (rut, etc.).

Although a conventional measuring system using a road surface texture measuring vehicle aims to simultaneously measure the transverse and longitudinal unevenness of a road surface, in practice, the transverse unevenness measuring device and the vertical unevenness measuring device are the same. The reality is that they are installed in vehicles and are individually measured. In other words, longitudinal concave and transverse unevenness of the road surface
There was no association between the two measurements for convexity .

[0006] Therefore, the measurement of the crossing of the road surface and the measurement of the vertical unevenness are duplicated, and the measured values are inconsistent. Therefore, there is a problem that the road surface property evaluation by these two types of measurement lacks accuracy. That is, up to now, no method has been proposed for measuring both the transverse unevenness and the longitudinal unevenness of the road surface using the same road surface measurement value.

[0007]

[Means for Solving the Problems] In order to solve the above-described conventional problems, the present invention uses a measurement value obtained from a plurality of vertical displacement gauges mounted on a vehicle to determine whether the road surface cross unevenness is detected. I also asked for vertical irregularities in>. According to the present invention, at least three vertical displacement gauges for detecting a road surface height from a reference surface to a road surface are mounted on a vehicle along a direction perpendicular to a traveling direction of the vehicle, and the vehicle is installed at every predetermined traveling distance of the vehicle. In addition, the detection results are taken in from the at least three vertical displacement meters, and the vertical unevenness can be calculated as well as the transverse unevenness of the road surface.

[0008]

Embodiment An embodiment according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram illustrating a method of detecting (measuring) road surface heights at three locations in a transverse direction of a road surface by a plurality of vertical displacement gauges mounted on a vehicle. FIG. 2 is a diagram showing how information indicating the road surface height in the transverse direction is taken in from a plurality of vertical displacement gauges arranged in the transverse direction of the road surface for each predetermined distance in the vehicle traveling direction.

As shown in FIGS. 1 and 2, the vertical displacement gauges 10 a to 10 c are connected to each other in the traveling direction of the vehicle 14 (arrow 1 in FIG. 2).
It is mounted on the vehicle 14 along a direction perpendicular to 2). That is, the vertical displacement gauges 10a, 10b, and 10c are attached to the left wheel trace portion, the right wheel trace portion, and the center portion between the left and right wheel trace portions of the vehicle 14, respectively. The wheels are not shown in FIG.

The vertical displacement meters 10a to 10c themselves are known and output a signal representing the distance from the reference surface 15 (the surface including the straight lines 16 and 18) to the road surface using laser light, ultrasonic waves, or the like. That is, the vertical displacement meter 10a measures the distance (road surface height) H from the reference surface 15 to the road surface 20 at the left wheel mark portion of the vehicle 14.
A signal indicating L is output, and the vertical displacement meter 10b displays the reference plane 15
To a road surface 20 in the trace of the right wheel of the vehicle 14 (road surface height) HR is output. On the other hand, the vertical displacement meter 10
c outputs a signal representing the road surface height HC at the central portion between the left and right wheel traces of the vehicle 14 from the reference surface.

For convenience of explanation, a straight line that is parallel to the above-mentioned straight line 16 and that passes through the road surface at the center between the left and right wheel traces is indicated by reference numeral 22.

As shown in FIGS. 1 and 2, three vertical displacement gauges 10 a to 10 c are mounted on a vehicle 14, and the displacement gauges 10 a to 10 c are spaced at a predetermined distance W (150 cm or less) according to the traveling of the vehicle 14. The signal from the device is fetched and stored in an appropriate storage means. It should be noted that since the information can be fetched from the displacement gauge for each predetermined traveling distance of the vehicle by a known means, description thereof will be omitted. The signals from the vertical displacement gauges 10a to 10c at arbitrary measurement points i are respectively set to HLi, HRi, and H.
Assuming Ci, the measured values stored in the storage means are ..., HLi-n, ..., HLi, ..., HLi + n,
..., HRi-n, ..., HRi, ..., HRi + n,
..., HCi-n, ..., HCi, ..., HCi + n,
... (n is a positive integer).

[0013] After measuring the travel of the vehicle is completed, transverse and longitudinal concave road surface by using the data stored in the storage means
Measure the amount of convexity .

[0014] First, in about <br/> the road crossing irregularities at the measurement point i, the left wheel Keigo transverse irregularities amount DLi is DLi = HCi-HLi · · · Number 1 right wheel Keigo transverse irregularities amount DRi is DRi = HCi-HRi ... Equation 2 The total amount of transverse unevenness Di is obtained by Di = (DLi + DRi) / 2 ... Equation 3

Next, since the flatness in the extension direction of the road (the traveling direction of the vehicle) is defined by the standard deviation of a plurality of vertical unevenness amounts measured in a certain distance section, the road surface lateral width that has already been obtained is determined. It is obtained for each of the above sections by using the amount of unevenness . That is, since the standard deviation of the vertical unevenness amount in an arbitrary section is equal to the standard deviation of the transverse unevenness amount in the section, the flatness of an arbitrary section is generally

[Equation 4] Can be obtained with.

Further, from the N cross-sections of the road surface, the average rutting depth of the left and right ring marks, the average rutting depth of the whole, the flatness of the left and right ring marks, and the overall flatness are as follows. Can be asked. That is, the unevenness amounts of the left and right wheel traces in the N cross sections are respectively DLi, DRi (i = 1, 2, ...
., N), the average rutting depth of the left wheel trace is

[Equation 5] The average rut depth of the left wheel trace is given by

[Equation 6] The overall average rutting depth is given by

[Equation 7] Given by. On the other hand, the flatness of the left wheel trace is

[Equation 8] The flatness of the right wheel trace is given by

[Equation 9] The overall flatness given by

[Equation 10] Given by.

In the above description, three vertical displacement gauges are used, but if four or more displacement gauges are used, it is possible to more accurately obtain the transverse and vertical irregularities . The calculation of the road crossing / longitudinal unevenness after obtaining the road surface height information from the vertical displacement gauge is known.

[0018]

According to the present invention, the following remarkable effects can be obtained. (a) Dedicated devices are not required for measuring transverse unevenness and longitudinal unevenness, respectively . In other words, since the road surface crossing and the longitudinal unevenness can be measured from the same measurement value, there is no duplicate measurement.
Therefore, there is no possibility of inconsistency in each measurement. (b) It is extremely easy to calculate the vertical unevenness of the left and right wheels and the total vertical unevenness . (c) Since a vertical displacement meter is used, it is possible to measure day and night, and it is possible to use a lane marking to mark the bright line on the road surface with a laser beam as in the conventional example. The measurement result is not adversely affected. (d) High-speed and high-density measurement is possible. (e) It is possible to measure the crossing and longitudinal unevenness of a large extension road all at once.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the present invention.

FIG. 2 is a diagram for explaining the present invention.

[Explanation of reference numerals] 10a to 10c: Vertical displacement meter 14: Vehicle 15: Reference surface 20: Road surface

Claims (3)

[Claims] 1. At least three vertical displacement gauges for detecting a road surface height from a reference surface to a road surface are mounted on a vehicle along a direction perpendicular to a traveling direction of the vehicle, and the vehicle is installed at each predetermined traveling distance of the vehicle. A method for measuring crossing / longitudinal section of a road surface, characterized in that detection results are simultaneously obtained from at least three vertical displacement meters. 2. The at least three vertical displacement gauges detect the road surface height of each of the left wheel trace portion and the right wheel trace portion of the vehicle, and the center road surface height between the left wheel trace portion and the right wheel trace portion of the vehicle. The measuring method according to claim 1. 3. The measuring method according to claim 1, wherein the predetermined traveling distance of the vehicle is 150 cm or less.