JPS5835315B2 - Vehicle axle number measurement circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an axle number measuring circuit that measures the number of axles of a vehicle running on a toll road, parking lot, or the like.

As this type of device, for example, the applicant has proposed the following axes number measuring circuit.

The axle number measuring circuit according to this proposal is equipped with a forward shaft circumference counter and a reverse shaft circumference counter corresponding to each divided detector, and when a wheel passes forward, a forward shaft circumference counter ( If the vehicle is passing in reverse, 1,000 is added to the reverse shaft circumference counter (1,000, 1 is added) corresponding to the pressed detector.

The maximum value is detected for each forward axis counter and reverse axis circumference counter of each detector, and the reverse axis maximum value is subtracted from the forward axis maximum value, and the number of passing axes and the passing direction are obtained from the result.

However, in this axis number measuring circuit, only the shaft circumference counter of the pressed detector is measured, and the shaft circumference counter of the unpressed detector is not measured, so that a maximum value and a minimum value of the shaft circumference count occur.

Here, when the following wheel passes only the detector corresponding to the minimum value of the shaft circumference counter, +1 is added only to the minimum value of the shaft circumference counter and approaches the maximum value, or the maximum value of each shaft circumference counter Since the value is taken as the number of passing axles, the number of passing axles does not change even if the following wheels pass in this manner, and therefore, the number of axles for one vehicle may not be correctly measured.

For example, if a special towing vehicle (including a tricycle) passes over the detector, the result may be less than the actual number of passing axes.

An object of the present invention is to eliminate such drawbacks and provide an axes number measuring circuit with improved discrimination accuracy.

To this end, in the present invention, +1 is added not only to the shaft circumference counter corresponding to the detector whose wheel is pressed, but also to the shaft circumference counter corresponding to the detector whose wheel is not pressed, and the multi-divided detector is The number of axes can be measured more accurately by making it appear to correspond to one detector.

The present invention will be explained below with reference to the drawings.

FIG. 1 shows the arrangement of the axle number detection device and the positions of wheels passing by a special towing vehicle, etc., and FIG. 2 shows an outline of the special towing vehicle (including a tricycle), etc.

This special towing vehicle consists of a towing vehicle DV and a towed vehicle TV, and the wheels 3TR and 3TL of the towed vehicle TV pass only through central detectors IC and 2C.

The first and second detectors 1 and 2 are each divided into multiple parts in the road width direction (three parts in the example of FIG. 1), and each of the detectors IL, IC, IR; 2L,
Length LL of 2C and 2R.

Since both Lc and LR are set to dimensions smaller than the minimum value of the inner rectangle of the wheel tread width on both sides of one axis, each detector IL, IC, IR; 2L, 2C.

2R is never pressed by wheels on both sides of one shaft at the same time.

In the following description, the subscripts C and R are used to indicate the left, center, and right positions, respectively, depending on the installation positions of the divided detectors.

Next, each detector IL, IC, IR; 2L. For example, 2C and 2R operate like treadle contacts, and are normally in a non-conducting state, but when a wheel passes over the detector and is pressed by the wheel, they become conductive, and after the wheel passes, they become non-conductive again. It performs the action of returning to the state.

Therefore, due to the suppression of the wheels, the first detector 1 (IL, IC
, 1R), the signal A1 (AIL, AIC, AIR),
Second detector 2 (2L.

2C, 2R) is the signal A2 (A2L, A2C.

A2R) is obtained.

FIG. 3 is a block diagram showing an example of the implementation of the axes number measuring circuit according to the present invention.

Here, signals AIL and A2L from detectors 1 and 2,
AIC and A2C and AIR and A2R are supplied in pairs as input signals to OR gates 4R, 4C, 4L and traveling direction determining circuits SR, 5C, 5L, respectively.

Each OR output of OR gates 4R, 4C, 4L is
,C.

At the time t when the pulse has completed passing through the L side detectors IR, 2R; IC, 2C; IL, 2L, it is supplied to one-shot pulse generators 6R, 6C, 6L that generate count pulses.

Each output FR, FC of the traveling direction determination circuit 5R, 5C, 5L
, FL is forward judgment output, BR.

BC and BL are backward determination outputs, and R8, C8, and LS are wheel passage detection signals on the right, center, and left sides.

The outputs of the one-shot pulse generators 6R, 6C, and 6L and the forward judgment outputs F'R, FC, and FL are supplied to AND gates γR, 7C, and 7L, respectively, and the outputs of the one-shot pulse generators 6R, 6C, and 6L are Output and reverse judgment output BR, B
C, BL and are supplied to AND gates 8R, 8C, and 8L, respectively.

The right and left side passage detection signals R8 and LS are supplied to the selection command generation circuit 91ζ, and the detection signals R8 and L on both sides are
generate an A input selection signal when S occurs simultaneously;
The center passing signal C8 is also supplied to the reset input terminal of the selection command generation circuit 9, and when the C8 signal is generated, the A input selection signal is reset to become the B input selection signal.

The next stage 10 represents a data selection circuit, to which the right side outputs from AND gates 7R and 8R are applied to the A input terminal, and the center outputs from AND gates γC and 8C are applied to the B input terminal.

Further, this data selection circuit 10 is supplied with the selection signal of the A input or B input from the selection command generation circuit 9 as a selection control signal via the signal line 11, and the C8 output from the traveling direction determination circuit 5C. is also supplied as a selection control signal.

In this data selection circuit 10, when the detection signals R8 and LS occur simultaneously, the right output from the AND gate 7R or 8R is selected by the A input selection signal, and the AND gate 7R output is taken out to the output line 72 during forward movement. The AND gate 8R output is taken out to the output line 13 when the vehicle is traveling in reverse.

Furthermore, when the detection signal C8 is generated, the central output from the AND game 1-7C or 8C is selected by the B input selection signal, and when moving forward (this is when the output from the AND game 1-7C is taken out to the output line 12). , l Finally, and gate 8C
The output is taken out to the output line 13.

Furthermore, 11R, 11C, and 11L are advance marine counters;
2R, 12C, and 12L are backward axis circumference counters, and the counter 11R is supplied with the output of the AND gate 7R, the counter 11C is supplied with the output of the output line 12, and the counter 11L is supplied with the output of the AND gate 7L. 12
The output of the AND gate 8R is supplied to R, the output of the output line 13 is supplied to the counter 12C, and the output of the AND gate 8L is supplied to the counter 12L.

The respective outputs of the forward axis counters 11R, 211C, and 11L are supplied to a forward marine maximum value detection circuit 13, which may be constructed of, for example, a digital comparator, and the maximum value of these forward axis counter outputs is extracted.

Reverse axis counters 12R, 12C. The respective outputs of 12L are supplied to a backward axis circumference maximum value detection circuit 14 which can be constituted by, for example, a digital comparator, and the maximum value of these backward axis counter outputs is extracted.

The forward axis maximum value and the reverse axis maximum value from these maximum value detection circuits 13 and 14 are supplied to a subtraction circuit 15, and the difference between the two maximum values is taken out as an output signal Xo=Xn in the form of a binary code.

This output signal X. ~Xn represents the number of passing axes of the vehicle.

In the axle number measuring circuit of the present invention having the above-described configuration, each time the wheel passes each of the detectors 1L and 2L, IC and 2C, and IR and 2R, if the wheel passes forward, the forward marine vehicle corresponding to the pressed detector is detected. +1 is added to the counters 11R, 211C and 11L, and when the wheel passes through the detectors 1L and 2L, IR and 2R, and does not pass through the detectors 1C and 2C, it corresponds to the detectors IC and 2C that were not pressed. +1 is also added to the shaft side counter 11C.

Further, if the vehicle is passing backward, +1 is added to the backward shaft circumference counters 12'R, 12C, and 12L in the same manner as when passing forward.

The maximum value of the reverse axis circumference counter of each detector 1 and 2 is subtracted from the maximum value of the forward vessel counter of each detector 1 and 2, and the result of the subtraction is taken as the number of passing axes.

Here, the number of axles for one vehicle can be easily obtained using a vehicle separation signal (not shown) obtained by detecting the presence or absence of a vehicle body.

Next, the operation of the circuit shown in FIG. 3 will be explained by taking as an example the case where the vehicle is moving forward.

A split detector, for example the R-side detector IR.

When wheels 3FR and 3RR pass over 2R, the detector IR
, 2R are obtained from the signals AIR and A2R, and the traveling direction determining circuit 5R determines the normal passing state of the wheels from the phase relationship of these two signals and also determines the traveling direction of the wheels.

At the same time, due to the OR output of both human power signals AIR and A2R, the one-shot pulse generator 6R detects the wheel on the right side detector IR.

A count pulse is generated when the passage through 2R is completed.

This count pulse is AND gate 7R. At 8R, the output of the advancing direction determining circuit 5R is inputted to the gate control card right forward axis counter 11R or the reverse axis circumference counter 12R, and is also added to the input A of the data selection circuit 10.

Further, it is assumed that a reset signal (not shown) activated at the end of the count pulse causes the traveling direction determination circuit 5R to return to the state before the wheel entered.

The above is an explanation when the wheel passes over the right side detectors IR and 2R, but even if the wheel passes over other detectors (center, left side), the shaft side counter corresponding to each detector will count up using the same circuit. be done.

Human power A and B of the data selection circuit 10 are the selection command generation circuit 9
This is performed by the center forward direction determination circuit 5C.

In the selection command generation circuit 9, forward direction determination circuits 5R and 5L
From the signals R8 and LS, the detector 1R and the wheel are on the R side and L side.
2R: When it is detected that IL and 2L are pressed, input A is selected as the output of the data selection circuit 10, and when the wheel passes the detector IC and 2C side, the forward direction determination circuit 5C is activated. Then, the selection command generating circuit 9 is reset by the warpage signal C8, and the input B is selected as the output of the data selection circuit 10. Therefore, the counter for the forward and backward axes corresponding to each pressed detector is counted up, and the wheel When passes through both the left and right detectors IR, 2R; IL, 2L and does not pass through the central detectors IC, 2C, the axis side counter corresponding to the detector that did not pass is also counted up. .

Next, the forward marine maximum value detection circuit 13 generates three forward marine counters 11R and 11C.

The maximum value of the reverse shaft circumference counters 12R, 12C, and 12L is determined by the maximum value of the reverse shaft circumference counter 11L and the reverse shaft circumference maximum value detection circuit 14.

The subtraction circuit 15 subtracts the reverse axis maximum value from the forward axis maximum value to obtain passing axes number outputs Xo to Xn.

The above operation is performed every time a wheel passes over the detectors 1 and 2, and by combining this axle passage detection output with the vehicle separation signal obtained by detecting the presence or absence of a vehicle body, the The number of axes can be measured.

Figure 1 shows an example of the passage of a special tow train, etc., in which the front wheels 3FR and 3FL of the tow train DV pass through the right and left detectors 1R, 2R; IL, 2L, and the center detector I.
C, when not passing through 2C, the right and left detectors IR,
2R; Marine counter 11R, 11 compatible with IL, 2L
At L, +1 is added to each one-shot pulse by the count pulses from the generators 6R and 6L, and the output from the one-shot pulse generator 6R is added to the output of the data selection circuit 10 by the operation of the selection command generation circuit 9. supplied,
+1 is also added to the marine counter 11C.

Mataken Train DV rear wheel 3RR. Similarly, counters 11R and 11L are used for 3RL.

Add +1 at 11C.

Next, when the wheels 3TR and 3TL of the towed train TV pass only the central detectors 1c and 2c, the traveling direction determination circuit 5C
As a result, the output from the one-shot pulse generator 6C is selected as the output of the data selection circuit 10, and +1 is added to the marine counter 11C.

Table 1 shows the number of passing axes = 3 when the special tow train shown in Fig. 2 passes through detectors 1 and 2 as shown in Fig. 1, measured by the measuring circuit of the present invention shown in Fig. 3. The results are shown in comparison with results measured using a conventional device.

As is clear from this Table 1, the marine counter 11R,
The contents of 11C and 11L are R=2°C=3. Since L=2 and the maximum value of each of these marine counters 11R, 11C, and 11L is 3, this means that the number of passing axes is 3 and the forward movement is taken out as an output.

On the other hand, it can be seen that the conventional device incorrectly judges the number of axles when the special tow train passes forward as two.

Note that although the above description has been made regarding the forward passage of the vehicle, the same applies to the backward passage of the vehicle.

Further, in the embodiment shown in the third figure, the wheel passes through both the right and left detectors IR, 2R; IL, 2L, and the center detector 1
marine counters '11c, 12 corresponding to the central detectors 1c, 2c that are not pressed when the detectors do not pass through
+1 is added to C, but in addition to this configuration, when the wheel passes only the central detector IC, 2C, the right and left detectors IR, 2R;
L.

Marine counters 11R and 12R corresponding to 2L.

The circuit can also be configured to add +1 to 11L and 12L.

As detailed above, in the present invention, a forward axis counter and a reverse axis counter are provided for each multi-divided axle number detector, and furthermore, the wheel passes through the right and left side detectors, and the center When the wheel does not pass the detector on the left side, +1 is also added to the marine counter corresponding to the detector that was not pressed due to the count pulse generated corresponding to either the right side or the left side. If it passes forward every time it passes, the forward marine count of the corresponding detector is +
If it passes backward, add +1 to the reverse axis counter of the corresponding detector, compare the numbers for each detector's forward axis counter and backward axis counter, and find the maximum value. The number of passing axes is determined by subtracting the maximum value of the forward axis and the maximum value of the reverse axis.

Due to this circuit configuration, according to the present invention, the detection output is handled in such a way that the multi-divided detector apparently corresponds to a single detector. Of course, even in the case of a special form of passage as shown in FIG. 1, the effect of being able to more accurately measure the number of passing axes can be obtained.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing the positional relationship between the multi-divided detection base of the present invention and a special towing vehicle as an example of the object to be measured, and FIG. 3 shows an example of the configuration of the axle number measuring circuit of the present invention. FIG. 1 (IL, IC, IR), 2 (2L, 2C, 2R)...
・Detector, 3FR, 3RR, 3FL, 3RL. 3TR, 3TL...wheels, DV...tow vehicle, TV
... Towed vehicle, 4R, 4C, 4L... Or gate, 5R, 5C, 5L... Traveling direction determination circuit, 6R. 5C, 6L...One-shot pulse generation circuit, 7R,
7C, 7L, 8R, 8C, 8L...and gate,
9...Selection command generation circuit, 10...Data selection circuit, 11R, 11C, 11L...Advance marine counter, 1
2R, 12C, 12L...Reverse axis counter, 13.
... Maximum value detection circuit in the forward axis, 14... Maximum value detection circuit in the reverse axis, 15... Subtraction circuit.

Claims (1)

[Claims] 1. Two multi-segmented detectors that detect wheels and news signals by the pressure of the wheels are arranged in parallel in a direction substantially perpendicular to the traveling direction of the road, and the multi-segmented detectors are divided. a traveling direction determination circuit that receives the detection output from the detector for each unit and identifies the traveling direction of the wheel; and a traveling direction determination circuit that receives the detection output from the detector for each divided unit and determines when the wheel has completed passing through the detector. A pulse generation circuit that generates one pulse at the current time, and a forward axis circumference counter that receives the forward determination output from the traveling direction determination circuit and one pulse from the pulse generation circuit and changes the count by +1. and a reverse shaft circumference counter that receives the backward determination output from the traveling direction determination circuit and one pulse from the pulse generation circuit and changes the count by +1, and the forward shaft circumference counter and the reverse shaft circumference counter. A maximum value detection circuit detects the maximum value of each counting content to obtain the forward axis maximum value and the reverse axis maximum value, and extracts the difference between the forward axis maximum value and the reverse axis maximum value, and passes from this difference value. In a vehicle axle number measuring circuit comprising a subtraction circuit for obtaining the number of axles and the passing direction, when the wheel is passing forward, the forward axis circumference counter corresponding to the pressed detector receives a pulse from the pulse generating circuit. +1 is added by the pulse generated by one of the pulse generating circuits corresponding to the pressed detector, and +1 is added to the unpressed detector (the corresponding forward axis counter) by the pulse from one of the pulse generation circuits corresponding to the pressed detector. and when the wheel is passing in reverse, +1 is added by the pulse from the pulse generation circuit in the reverse shaft circumference count corresponding to the pressed detector, and +1 is added to the reverse axis circumference count corresponding to the pressed detector, and A vehicle axle number measuring circuit, characterized in that the reverse axle circumference counter also increments +1 by a pulse from one of the pulse generation circuits corresponding to the pressed detector. 2. Patent: 2. A vehicle axle number measuring circuit according to claim 1, wherein said detector is divided into three units of left, center, and right side detectors.