JPH0795359B2 - Vehicle type identification device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle type identification device used in an unmanned system such as a toll road and toll parking lot, and in particular, an improvement of a resistance contact type axle wheel detector. Regarding

[Conventional technology]

Generally, on toll roads, vehicle types (normal vehicles, large vehicles,
The toll is often different depending on the size of the vehicle. In addition, on toll roads with many sections such as expressways, the tolls set for each section are collected.

In such a multi-section toll road, the toll collector who works at the entrance gate of the entrance interchange provides the toll road user with necessary data such as entrance interchange name (number), entrance approach date, approach time and vehicle type. Issue the recorded ticket. Then, the toll collector working at the exit gate of the exit interchange receives the above-mentioned pass ticket from the user, inserts each of the data recorded in the received pass ticket into the data processing device, performs predetermined processing, and passes the pass. The fee is calculated, and this fee is collected by cash, a coupon ticket or a postpaid card (cashless card).

By the way, the toll road business must be carried out day and night, and a large number of toll collectors are required due to the recent expansion of the toll road network. For this reason, it has been desired to reduce the number of personnel at the entrance / exit gates of each interchange and to make it unmanned.

In order to make the entrance gate unmanned, it is sufficient to automatically discriminate the vehicle type of the passing vehicle and automatically issue a pass ticket based on the result of the automatic discrimination. Therefore, conventionally, a vehicle type discriminating device has been used in which the number of axles, the number of wheels, and the wheel distance of a passing vehicle are measured by an axle wheel detector, and the vehicle type is automatically discriminated based on the measured values.

FIG. 3 is a schematic diagram showing the conventional vehicle type identification device described above. In the figure, reference numerals 11 and 12 denote vehicle separators each having a structure in which light emitters and receivers composed of a plurality of pairs of photocells are vertically stacked at substantially equal intervals. An optical axis film is formed on W. Reference numeral 14 denotes an axle wheel detector, which is embedded in a vehicle passage W between the vehicle separators 11 and 12, and the number of axles and wheels of a vehicle (not shown) traveling along the passage W in the direction of arrow TR in the figure. It measures the number and the wheel distance. In the figure, IL indicates islands at both ends of the vehicle passage W.

FIG. 4 is a structural diagram of the axle detector 14. In the figure, reference numerals 21 and 22 denote resistance contacts for measuring the number of wheels and the wheel distance of a passing vehicle. The resistance contacts 21 and 22 are arranged at equal intervals with the upper flat contact body 23 as shown in FIG. 5 (a). The lower contact body 24 is disposed in a horizontal position, and the solid resistance 25 having the same resistance value is disposed between the lower contact bodies 24. The upper flat contact body 23 and the lower contact body 24 are made of a material such as stainless steel. When the vehicle passes over the resistance contacts 21 and 22, the upper flat contact body 23 is elastically deformed and the deformed portion is the lower contact. When contacting the body 24, this contact point is short-circuited,
Since the resistance values at both ends of the lower contact body 24 change, the number of wheels and the wheel distance are measured with this change in resistance value.

Further, in FIG. 4, reference numerals 26 and 27 are flat contacts for measuring the number of axes of a passing vehicle, and these flat contacts 26 and 27 are shown in FIG. 5 (b).
As shown in FIG. 3, it is composed of an upper contact body 28 and a lower contact body 29. And, these upper contact body 28 and lower contact body
The 29 is also made of a material such as stainless steel, and elastically deforms when the vehicle passes through to come into contact with it, resulting in a short circuit. Therefore, the number of axes is measured by detecting this short circuit.

Here, the operating principle of the axle detector 14 will be described with reference to FIG. In FIG. 6, 31 and 32 are resistance contacts
21 and 22 show the upper contact body 23, and 33 and 34 show the lower contact body 24 including the solid resistance 25 of the resistive contacts 21 and 22. The resistance contacts 21 and 22 are a1, b1 and c1 respectively.
And a2, b2, c2 terminals.
a1 and a2 are connected to one side of the upper contact bodies 31 and 32, and contact points b1 and b2
Are connected to one ends of the resistors 33 and 34, and the contacts c1 and c2 are connected to the other ends of the resistors 33 and 34, respectively.

Now, a vehicle having wheels A having a wheel distance of L and a tire width of 1 approaches a shaft wheel detector 14, and a resistance contact is made.
Suppose that you step on 21,22. Here, the resistance contact 21 is arranged on the left side of the center of the vehicle passage W having a width of one lane,
Since the resistance contact 22 is disposed on the right side, the left wheel of the vehicle depresses the resistance contact 21 and the right wheel depresses the resistance contact 22. Then, in the resistance contact 21, the portion of the upper contact body 31 that receives the stepping pressure is deformed downward and comes into contact with the lower resistance body 33. Similarly, in the resistance contact 22, the portion of the upper contact body 32 which receives the stepping pressure is deformed downward and comes into contact with the lower resistance body 34. In this case, on the resistor 33 side, a contact portion occurs at the center in the width corresponding to the tire width 1 (resistance value r2), and non-contact portions occur at both ends (resistance values r1, r3). On the other hand, also on the resistor 34 side, a contact portion occurs in the center with a width corresponding to the tire width 1 (resistance value r5),
Non-contact parts occur at both ends (resistance values r4, r6). Then, the resistance values R1 ′ and R2 ′ between the terminals b1 and c1 and between the terminals b1 and c1 of the resistors 33 and 34 are the upper contact points of R1 and R2, assuming that the original resistance values are R1 and R2. The resistance value obtained by subtracting the resistance values r2 and r5 in the short-circuit section due to the contact between the bodies 31 and 32, that is, R1 ′ ＝ R1−r2 R2 ′ ＝ R2−r5, becomes the resistance value R1 when treading by the wheels. To R1 'and from R2 to R2'. Therefore, it is possible to determine whether the tire of the vehicle is a single tire (normal vehicle) or a double tire (large vehicle etc.) by measuring and comparing the change of the resistance value every time the vehicle tire passes. .

On the other hand, the resistance value of each section of the terminals a1, b1 and a2, b2 of the resistance contact 21, 22 shows the resistance value r1 of the left side portion not contacting the upper contact 31 on the resistance contact 21 side, and the resistance value on the resistance contact 22 side is the upper part. The resistance value r6 of the right portion that does not contact the contact 32 is shown. As described above, the vehicle passage W of the resistance contacts 21 and 22
The position on the road surface is a predetermined position that extends in the lateral shoulder direction from the center along the transverse direction of the road surface. Therefore, the value obtained by adding the resistance value between the terminals a1 and b1 and the resistance value between the terminals a2 and b2 is a value that shows a close relationship with the wheel distance of the vehicle. Thus, the axle wheel detector 14 can measure the number of axles and the wheel distance of the passing vehicle.

[Problems to be solved by the invention]

However, the axle detector 14 has the following problems. That is, as shown in FIG. 7, a conventional axle detector
The length m of each resistance contact 21, 22 in 14 is set so that the length of the resistance contact non-passing body n is shorter than the minimum wheel distance (light four-wheel vehicle) of the passing vehicle. This is because the number of wheels and the wheel distance cannot be measured if both the left and right tires pass through the resistance contact non-passing zone n. That is, in the conventional vehicle type discriminating apparatus using the axle wheel detector 14, the passing vehicle does not pass through the center of the passage, and, for example, FIG.
When the vehicle passes near the road shoulder as shown in (1) and only one resistance contact 22 is depressed, the number of axes can be measured but the wheel distance cannot be measured. Further, as shown in FIG. 8 (b), one side passes through the axle detector 14 while derailing the road shoulder, or the road width is wide due to the passage of a special vehicle, and neither resistance contact 21 nor 22 is depressed. In this case, the number of axles and wheel distance are not measured. Therefore, in such a case, it is difficult to distinguish the vehicle type.

Therefore, an object of the present invention is to provide a vehicle type discriminating apparatus capable of constantly measuring the number of wheels and the wheel distance of a passing vehicle with high accuracy and improving the precision of automatic vehicle type discrimination.

[Means for solving problems]

The present invention, in order to solve the above problems and achieve the object,
It is characterized by taking the following measures. That is, a vehicle separator formed by stacking a plurality of light emitters / receivers that are installed opposite to each other across a vehicle passage, and a wheel of a passing vehicle that is embedded in the vehicle passage corresponding to the installation position of the vehicle separator. Axle wheel detector that measures the number of axles, the number of wheels, and the wheel distance of the passing vehicle based on the electric resistance value that changes according to the pedaling action width of the vehicle, and the light shielding information and the axle wheel detection that are output from the vehicle separator. A vehicle type discriminating means for discriminating the vehicle type of the passing vehicle on the basis of the number of axles, the number of wheels and the wheel distance information output from the device, and the axle wheel detector has a maximum tire of the passing vehicle substantially in the center of the electric resistance portion. It is characterized in that an overlap width equal to or larger than the width and equal to or smaller than the minimum wheel distance is provided, and a distance from the vehicle width direction end portion of the axle detector to the overlap portion is equal to or smaller than the minimum wheel distance of the passing vehicle.

[Action]

By taking such measures, the number of wheels and the distance of the vehicle can be measured regardless of the position of the axle wheel detector, and one wheel can be removed from the road shoulder. Even if the vehicle passes through the road or the road is wide due to the passage of a special vehicle, at least the number of wheels can be measured.

〔Example〕

FIG. 1 is a structural diagram of an axle detector 40 according to an embodiment of the present invention. The axle detector 40 is embedded in the passage W, like the axle detector 14 shown in FIG. In FIG. 1, 61 and 62 are resistance contacts, and the specific construction and action are the resistance contacts shown in FIG. 5 (a).
It is exactly the same as the case of 21,22. 63,63 'and 64,64'
Is a flat contact, and its specific structure and operation are exactly the same as in the case of the flat contacts 26, 27 shown in FIG. 5 (b).

In this embodiment, the resistance contacts 61, 62 are made longer in the longitudinal direction than in the conventional case to provide the overlap width N, and the overlap width N is determined by the following three conditions.

In FIG. 2 (a), when the overlap width N does not exist or is small, when the tire of the passing vehicle has passed the boundary between the resistance contacts 61, 62 and the flat contacts 63 ', 64', the number of wheels Cannot be measured correctly. Therefore, the overlap width N needs to be equal to or larger than the maximum tire width l.

In FIG. 2 (b), when the passing vehicle approaches the road shoulder and passes over the axle wheel detector 60, if the overlap width N is narrow, the tire cannot pass over the resistance contact point 61 and the number of wheels cannot be measured. Becomes Therefore, the length M of the flat contacts 63 ', 64' connected in series with the resistance contacts 61, 62 needs to be equal to or less than the minimum wheel distance L (light four-wheel vehicle) of the passing vehicle. By doing so, the resistance contact 61 measures the number of wheels, and the resistance contact 62 measures the wheel distance.

In FIG. 2 (c), if the overlap width N is too long, both tires pass over the wrapped resistance contacts 61, 62, and the number of wheels cannot be measured. Therefore, the overlap width N needs to be equal to or smaller than the minimum wheel distance L (light four-wheel vehicle) of the passing vehicle.

Thus, the overlap width N that satisfies the above three conditions
Is embedded in the width direction of the vehicle passage W, and the vehicle passage W in which the axle detector 60 is embedded.
The vehicle separators 11 and 12 in which a plurality of light-emitters facing each other are vertically stacked are installed, and the number of axles, the number of wheels, and the wheel distance of each vehicle measured by the axle detector 60 are installed. By determining the vehicle type based on the information and the light-shielding information output from the vehicle separators 11 and 12, the vehicle type can be determined with higher reliability. Therefore, if the toll road passage ticket can be automatically issued to the user based on the vehicle type information determined by the vehicle type determination device, the toll road entrance gate can be unmanned.

The present invention is not limited to the above embodiment.
For example, in the above-described embodiment, the vehicle type identification device on the toll road has been described, but it goes without saying that the present invention can be applied to other systems in which the fee varies depending on the vehicle type, such as a toll parking lot. In addition, it goes without saying that various modifications can be made without departing from the scope of the present invention.

〔The invention's effect〕

As described above in detail, according to the present invention, a vehicle separator formed by stacking a plurality of light emitters and receivers that are installed to face each other with a vehicle passageway interposed therebetween, and the vehicle position corresponding to the installation position of the vehicle separator. A wheel / wheel detector embedded in a vehicle passage, which measures the number of axles, the number of wheels, and the wheel distance of the passing vehicle based on an electric resistance value that changes according to the stepping action width by the wheels of the passing vehicle; The vehicle type discriminating means for discriminating the vehicle type of the passing vehicle based on the light-shielding information output from the vehicle and the number of wheels, the number of wheels and the wheel distance information output from the axle wheel detector. An overlap width equal to or greater than the maximum tire width of the passing vehicle and less than or equal to the minimum wheel distance is provided approximately in the center of the resistance part, and the minimum wheel width of the passing vehicle is the distance from the vehicle width direction end of the axle detector to the overlap portion. Since the distance is less than or equal to the distance, Wa距 can be measured constantly with high accuracy, it can provide a vehicle type discriminating apparatus for obtaining improved accuracy in vehicle type automatic discrimination.

[Brief description of drawings]

FIGS. 1 and 2 (a) to (c) are views showing an embodiment of the present invention. FIG. 1 is a structural diagram of an axle detector, and FIG.
FIGS. (A) to (c) are views for explaining the setting condition of the overlap width N, and FIGS. 3 to 8 (a) and (b) are views showing a conventional example, and FIG. FIG. 4 is a schematic diagram of a conventional vehicle type identification device, FIG. 4 is a structural diagram of an axle detector, FIGS. 5 (a) and 5 (b) are structural diagrams of a resistance contact and a flat contact, and FIG.
FIG. 7 is an explanatory view of the operation of the axle detector, FIG. 7 is an explanatory view of conditions of the axle detector, and FIGS. 8A and 8B are explanatory views of problems of the axle detector. 11, 12 ... Vehicle separator, 60 ... Axle wheel detector, 61, 62 ... Resistance contact, 63, 63 ', 64, 64' ... Flat contact, N ... Overlap width.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Ken Uchida 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (72) Inventor Yoichi Uemura Kazu, Hyogo-ku, Kobe-shi, Hyogo 1-1-1 Tasakicho Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (56) References: 53-35054 (JP, U)

Claims (1)

[Claims] 1. A vehicle separator formed by stacking a plurality of light emitters / receivers facing each other across a vehicle passage, and a vehicle separator embedded in the vehicle passage corresponding to the installation position of the vehicle separator and passing therethrough. An axle detector that measures the number of axles, the number of wheels, and the wheel distance of the passing vehicle based on the electric resistance value that changes according to the stepping action width by the wheels of the vehicle, and the light-shielding information output from the vehicle separator, And a vehicle type discriminating means for discriminating the vehicle type of the passing vehicle based on the number of axles, the number of wheels and the wheel distance information output from the axle detector, wherein the axle detector is located substantially at the center of the electric resistance portion. While providing an overlap width equal to or greater than the maximum tire width of the passing vehicle and equal to or less than the minimum wheel distance, the distance from the vehicle width direction end of the axle detector to the overlap portion is equal to or less than the minimum wheel distance of the passing vehicle. A vehicle type identification device characterized in that