JP2738965B2 - Vehicle type identification device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vehicle type discriminating apparatus applied to, for example, a toll machine on a toll road.

[Prior Art] A set of vehicle passage detection devices in which a plurality of photoelectric switches are arranged in a vertical direction and are arranged to face each other across a road, and a pair of vehicles passing through the road to detect characteristics of a front side shape of the vehicle. Japanese Patent Application No. 50-100984 (Japanese Patent Application Laid-Open No. 52-24552) discloses a vehicle type discriminating device having a plurality of pairs of photoelectric switches arranged opposite to each other.
Has been proposed. The features are shown in FIG. In FIG. 3, PC3-1 to PC3-n and PC3-1 'to PC3-n' are photoelectric switches of a vehicle passage detector arranged in a vertical direction on a vehicle traffic road. When even one photoelectric switch is shielded by the logical sum, the output signal rises and the passage of the vehicle is detected. PC4 to PCm and PC4 'to PCm' are photoelectric switches provided on a side plane for detecting a side pattern of the vehicle. Each output signal of the photoelectric switch is provided by a photoelectric switch (PC3) of the vehicle passage detector. -1 to PC3-n, PC3-
1 'to PC3-n') are sampled at the time of the rising edge of the vehicle passage detection signal obtained from the logical sum output of the signals. By comparing and comparing the output signal pattern obtained by this sampling with the model signal pattern of the vehicle type stored in advance, the vehicle type of the passing vehicle can be determined.

[Problems to be Solved by the Invention] However, in the above-described conventional vehicle type discriminating apparatus, the photoelectric switch for detecting the side pattern of the vehicle is used.
For that purpose, PC4 to PCm and PC4 'to PCm' need to be arranged over a wide area in the longitudinal direction of the side plane of the passage, and there is a problem that the installation area of the apparatus is increased.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a first photoelectric switch group (PC1-1 to PC1-n) for detecting passage of a vehicle as shown in FIG. ) And a first vehicle detector (1) separated from the first vehicle detector (1) by a predetermined distance (L) in the vehicle passing direction. A second group of photoelectric switches (PC2-1 to PC2-n), which are arranged in parallel and are arranged in a line in the vertical direction similarly to the first group of photoelectric switches, for detecting a side pattern of a vehicle.
A second vehicle detector (2) constituted by
Scanning means for performing time-division scanning of the second photoelectric switch group (3,
4) and two sets of input pattern memories (in time series) storing switching operation patterns obtained from the second photoelectric switch group as the vehicle passes through the installation path of the photoelectric switch group as the vehicle passes. (9), (10), means (6) for correcting the input pattern according to the passing speed of the vehicle and compressing the time, and a compression pattern memory (11) for storing the compression pattern; A configuration including a vehicle type file (12) storing a standard pattern, processing means (6) for comparing and checking the compressed pattern and the standard pattern to determine the type of passing vehicle, and vehicle type determining means (8). It is what it was.

[Operation] In the configuration of the present invention described above, the side surface pattern of the vehicle that changes with the change in the passing speed of the vehicle can be subjected to pattern correction and pattern correction as follows.

That is, since the average speed of the vehicle can be determined from the time difference between the rise and fall of the two sets of photoelectric switches as the vehicle passes, the time-series pattern of the vehicle can be corrected to the compression pattern of the standard time.

When the difference between the rise time and the fall time of the two sets of photoelectric switches is large, the intermediate speed between the rise and the fall can be obtained by the interpolation method of the two speeds, so that the correction value can be sequentially corrected.

In addition, the change in the vehicle height with respect to the speed change during the passage can be detected from the time difference between the characteristic change points of the vehicle height because the two sets of photoelectric switches follow the same trajectory. The compression pattern can be corrected even for intermediate speed changes.

Therefore, even if the passing speed of the vehicle changes every moment, the vehicle side pattern is not delayed and an accurate side pattern of the vehicle can be obtained, and the vehicle type can be determined with high accuracy by comparing with the standard pattern.

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

In FIG. 1, reference numeral 1 denotes a light emitting unit 1a and a light receiving unit 1b.
An optical first vehicle detector incorporating two photoelectric switches (PC1-1 to PC1-n) in a vertical direction.
N photoelectric switches (PC2-1 to PC2
-n) is a second vehicle detector incorporating vertically. The light projecting parts 1a, 2a and the light receiving parts 1b, 2b of the vehicle detectors 1, 2 are respectively arranged opposite to each other with a vehicle traffic road interposed therebetween, and the first vehicle detector 1 and the second vehicle detector 2 Are installed at a predetermined distance (L) apart from each other in the vehicle traffic direction. This distance (L)
Is such that the first and second vehicle detectors 1 and 2 are not simultaneously shielded from light even when a human passes.
When the vehicle is shaded at the same time, it is recognized that the vehicle has entered.

Each of the vehicle detectors 1 and 2 incorporates n photoelectric switches (PC1-1 to PC1-n and PC2-1 to PC2-n) in the vertical direction, and the height thereof is almost maximum from near the road surface. The range covering the vehicle height is set, and the interval between the phototubes constituting the switch is set to a density capable of detecting a narrow pole of a connected vehicle.

The photoelectric switch (PC1-1 to PC1) of the first vehicle detector 1 is used.
To n), and the photoelectric switch (PC2-
1 to PC2-n) are simultaneously (parallel) (1 to n) high-speed switching scans performed by the first and second scanning circuits 3 and 4 provided in correspondence with each other. The scanning clock at this time is provided from a clock circuit (CLOCK) 5. The clock of the clock circuit 5 is obtained from an operation clock of a microprocessor (CPU) 6 which controls the entire apparatus.

Reference numerals 7 to 12 denote components connected to the microprocessor 6 via the bus 13, respectively. Reference numeral 7 denotes an input circuit (I / O) for inputting the detection signals of the vehicle detectors 1 and 2 and transferring the signals to the microprocessor 6. Reference numeral 8 denotes an output circuit (I / O) that outputs a determination signal under the control of the microprocessor 6. Reference numeral 9 denotes a photoelectric switch (PC) provided on the first vehicle detector 1 under the control of the microprocessor 6.
1-1 to PC1-n) a first input pattern memory (RA) for storing a switching operation pattern accompanying a vehicle passing in time series.
M). Reference numeral 10 denotes a second input pattern memory (RAM) for storing, in a time series, a switching operation pattern associated with the photoelectric switches (PC2-1 to PC2-n) provided in the second vehicle detector 2 passing through the vehicle. Reference numeral 11 denotes a compression pattern memory (RAM) for storing a pattern subjected to speed correction and time compression processing by the microprocessor 6. Reference numeral 12 denotes a vehicle type file memory (ROM) that stores a standard pattern measured and set in advance for each vehicle type.

When a vehicle enters the first vehicle detector 1 and the second vehicle detector 2, each of the above-described vehicle detectors is associated with the entry of the vehicle.
A light-shielding pattern that changes every moment is obtained from 1 and 2.

The pattern data output from the first vehicle detector 1 and the second vehicle detector 2 are input to the input circuit 7, respectively.

The microprocessor 6 receives the first,
Each photoelectric switch of the second vehicle detectors 1 and 2 (PC1-1 to PC1 to
n, PC2-1 to PC2-n) input pattern (light-shielding pattern) data corresponding to the first and second input pattern memories 9,
Remember in 10.

FIG. 2 shows an example of patterns and timings stored in the first and second input pattern memories 9 and 10 at this time.
Here, with the entry of the vehicle, the light-shielding of the photoelectric switches (PC1-1 to PC1-n) of the first vehicle detector 1 starts at the timing of t1, and t2 and t3 are sequentially input, and the passage ends at tx. I have. On the other hand, the photoelectric switch (PC2-1) of the second vehicle detector 2
~ PC2-n) is the installation interval (L) with the first vehicle detector 1
Rise with delay, time difference TA between t1 to t3 and tx to tx + 2
And TB are the transit times of the installation interval (L) between the first vehicle detector 1 and the second vehicle detector 2, and can be obtained by the average transit speed Vm of the vehicle Vm = 2L / TA + TB.

Therefore, the photoelectric switches (PC1-1 to PC1-n, PC2-1 to PC2-
If the scanning speed of n) is sufficiently high and the data during passing is sufficiently captured, the sampling rate is set according to the passing speed Vm of the vehicle, and the shading data is edited.
A side pattern of the vehicle independent of the passing speed is obtained.

This operation is executed by the microprocessor 6,
Under the control of the microprocessor 6, the standardized vehicle side pattern is stored in the compression pattern memory 11. Atomic data at this time is obtained from the first input pattern memory 9 or the second input pattern memory 10. Further, it is also possible to standardize the patterns of the input pattern memories 9 and 10 and take a logical sum or a logical product with respect to the patterns.

If it is desired to correct the speed in more detail, the intermediate speed change can be corrected by measuring the passage time Tc (see FIG. 2) of the portion where the light-shielding pattern changes. However, FIG. 2 shows only a case where the vehicle passes at a constant speed, but for example, photoelectric switches (PC1-1 to PC1-n, PC2-1 to PC1-1)
If you measure the interval between feature points, such as the part that changed from position 4 (PC1-4 / PC2-4) of PC2-n) to position 5 (PC1-5 / PC2-5), the time axis expands and contracts. Even so, a passing speed is required.

By repeating this sequentially, an accurate vehicle side pattern with speed correction can be obtained over the entire area.

As described above, the vehicle side pattern corrected to the standard time interval and edited on the compression pattern memory 11 is compared with the vehicle type file stored in advance in the vehicle type file memory 12, and the vehicle type of the passing vehicle is determined. You. The vehicle type data determined here is output via the output circuit 8.

In addition, the above photoelectric switches (PC1-1 to PC1-n, PC2-1 to PC2-
It is possible to determine forward / reverse from the rising or falling order of n), and the output circuit 8 outputs forward / reverse determination information simultaneously with the above-mentioned vehicle type output.

[Effects of the Invention] As described above in detail, according to the vehicle type identification device of the present invention,
A pair of first and second detectors each having a plurality of photoelectric switches arranged in a vertical direction are arranged at a predetermined distance in a vehicle traveling direction on a passage, and these photoelectric switches are time-divided. The switching operation pattern accompanying the passing of the vehicle obtained by scanning is stored in time series for each detector, and this pattern is corrected according to the passing speed of the vehicle, time-compressed, and a standard pattern for each vehicle type which is measured and set in advance. The configuration is such that the type of the passing vehicle is determined by comparing with the comparison, so that the photoelectric switch group arranged in the vertical direction is close to the vehicle traveling direction without arranging the photoelectric switch group in a wide area in the traveling direction of the vehicle. Thus, the vehicle type can be determined simply by arranging two sets side by side, thereby making it possible to reduce the size of the entire apparatus and to save the installation space, and to achieve an economically advantageous configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an apparatus according to an embodiment of the present invention, FIG. 2 is a time chart for explaining the operation of the above embodiment, and FIG. FIG. 1,2 ... vehicle detector, 1a, 2a ... light emitting part, 1b, 2b ... light receiving part, PC1-1 ~ PC1-n, PC2-1 ~ PC2-n ... photoelectric switch, 3,4
… Scanning circuit, 5… clock circuit, 6… microprocessor (CPU), 7… input circuit (I / O), 8… output circuit, 9,10… input pattern memory, 11… compression Pattern memory, 12… Model file memory, 13… Bus.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-24552 (JP, A) JP-A-53-23651 (JP, A) JP-B-60-29160 (JP, B2)

Claims (1)

(57) [Claims] A pair of first and second detectors each having a plurality of photoelectric switches arranged in a vertical direction, wherein each of the first and second detectors is separated by a predetermined distance in a vehicle traveling direction on a passage. A vehicle detection mechanism, scanning means for performing time-division scanning of photoelectric switches provided on the first and second detectors, and a vehicle detection mechanism provided on the first and second detectors. First and second input pattern memories for storing a switching operation pattern accompanying the vehicle passage of the photoelectric switch in time series for each of the detectors, and an average vehicle passage based on the patterns stored in the input pattern memory. Means for calculating the speed, means for correcting the pattern stored in the pattern memory according to the calculated passing speed and time compressing, a vehicle type file for storing a standard pattern for each vehicle type measured and set in advance,
Means for comparing and comparing the time-compressed pattern with a standard pattern of the vehicle type file to determine the type of passing vehicle.