JPS58127297A - Vehicle sensor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention uses a wheel passing detector to detect the number and speed of vehicles.

This relates to a vehicle type identification device that identifies vehicle types, and can easily and accurately identify vehicles, especially those with different numbers of axles.

This relates to a vehicle sensor 11 that is capable of determining the speed and type of vehicle.

As shown in Fig. 1, conventional devices of this type include wheel passage detectors (hereinafter referred to as wheel detectors) A and B, each consisting of two tape switches or rubber hose switches.
are installed in parallel on the road, crossing the direction of travel of the vehicle 0, and the spacing between the axles (axle distance) Ozt is determined by the following means. In addition, in the figure,! indicates the installation interval of wheel detectors A and B, and the arrow indicates the direction of CO deposition of the vehicle.

Assuming that vehicle C passes the wheel detector and the wheel detector IsB at vehicle speed V, the time from when the wheels of vehicle C pass the wheel detector to when the rear wheels pass is T, and when the front wheels Let T be the time it takes for the wheel to pass through the wheel detector B and pass through the wheel detector B.

Then, each of these times T, , T, is I T-1 (1) v! T snow =-・ ・ ・ ・ ・ kai ・ It is expressed as (2). Above (t), (from formula 21, ′r 01 = j・yu・・φ・・(3)T.

Therefore, by measuring T, , T, using this equation (3), the axle distance 04 can be determined, making it easier to classify a single type.

The information obtained in this way and the calculated nine axle distances OI is applied to a vehicle type classification circuit to classify the vehicles according to their lengths, and the output is configured to operate a collar and count the number of vehicles. The information on the vehicle speed is added to a moderate classification circuit, which classifies the vehicle according to the speed, and uses the output to operate a reference kakunta to determine the number of vehicles.

However, in this type of vehicle sensor, there is no problem in the case of a 2-axle vehicle, but in the case of a 3-axle vehicle, j > 01 (as shown in Figure 2 (a), which is the theory).
There is no problem in the case of the wheelbase distance between the front and rear axles of the 077i vehicle, but as shown in Figure W42 (b), I < 0.
1, the 3-axle vehicle is determined to be a 2-axle vehicle with the wheelbase distance between the front wheels and the center axle, that is, the inter-axle DI, and the detection of the rearmost wheel is mistakenly determined to be the front wheel of a new vehicle that follows.

Therefore, the conventional example has the disadvantage that accurate vehicle identification is impossible when l>01, and there are restrictions on the installation of wheel detectors such as tape switches and rubber hose switches. However, it has the disadvantage that, for example, the distance between the tape switches must be longer than the distance between the axles.

In view of the above points, the present invention has been made in order to solve such problems and eliminate such drawbacks.
The object of the present invention is to provide a vehicle sensor that can detect the type of vehicle.

To achieve this purpose, the present invention calculates the inter-vehicle distance 111 (minimum distance between two vehicles) L by a wheel detector, B
Set the threshold installation interval l to maintain the relationship l<L, set up a timer for the inter-vehicle distance between the two vehicles, and use the timer to turn off the last clock of the first wheel detection @A. The last wheel is determined based on whether the vehicle is empty or upside down.Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Figure 3 shows wheel detection i in the vehicle sensor by Honjitsu@VC.
This is a theory @ diagram for explaining the relationship between the installation interval l of lA and H and the inter-vehicle distance M (minimum distance between the axles of two vehicles) L of the first white and second gold 02 vehicles, and it is set as l < L @ Note that Ol indicates the axle distance, and the arrow indicates the traveling direction of the vehicle.

FIG. 4 is a block diagram showing one embodiment of the vehicle sensor according to the present invention, showing only the parts necessary for explanation. In 4@, the same reference numerals as in FIG. 3 indicate corresponding parts; DET,
, DlliliT, are produced by the outputs of the 1st and 20th wheel detectors A, H, respectively.
! In the j12 input detection circuit, the output of this jilt input detection circuit DFliT is connected to the input side of the sl timer circuit TM, and is also connected to the input 11Klii of the sl timer circuit TM. The output of the input detection circuit I) BT is connected to the input side (reset terminal) of the timer circuit TM of s2, and is configured to reset the second timer circuit TM.

08M is a vehicle speed needle at circuit which inputs the output of the second timer circuit TM and measures the vehicle speed, and its output is introduced into the input terminal of the minimum distance needle circuit MO8MO, and the output OU
It is configured to be used.

[The minimum inter-vehicle distance m circuit MO8M calculates the passing time of the axle distance between vehicles based on the input from the vehicle speed measurement circuit 08M, that is, the inter-vehicle distance (2 It is configured to measure the minimum distance (between the axles) L of the vehicle. TM is a third timer circuit that inputs the output of the minimum distance needle m circuit MO8M42) and measures the required time based on this input, and the output of the third timer circuit TM resets the first timer circuit TM1t. It is configured to

OWM is a wheel leakage-proof circuit that receives the output of the first timer circuit TM and verifies the front wheels and rear wheels of the vehicle.
is an axle measuring circuit that receives the output of the axle measuring circuit OWM as an input and measures the axle distance, and OKD is an axle determination circuit that uses the output of the axle needle adjustment circuit l@OWAM as its input and determines the vehicle type. And OUT indicates the output.

Next, the operation of the embodiment shown in FIG. 1114 will be explained with reference to the aS diagram. j In diagram I5, (a) shows that the axle is 1
The time chart in the case of 2I, that is, in the case of an ordinary passenger car, is shown in Fig. 9, and (b) shows 13
′, i.e., dog breed track.

The time chart for the case of pass O is shown in a circle. Then, M and B indicate the outputs detected by sh and the second wheel generator, BK, respectively, F indicates the pulse obtained by the front wheels of the vehicle, and R indicates the pulse obtained by the rear wheels of the vehicle.

9, ■, ·, Φ are respectively Jl t as the second . Third timer circuit TM1. TM, , TM, shows an aspect in which time is measured.

First, the installation interval l of wheel detection @A and B shown in Fig. 183 and the inter-vehicle distance (minimum distance between two vehicles) L are set so as to satisfy the condition l<L. When the first wheel detector At passes, i.e. when the vehicle's rolling wheel hits the tape switch of the first wheel detector At, jIs
Figure (1) * 111 pulses F of A shown in (b)
This generates a broom 10 human power detection abbreviation ng'r,
is activated to detect the front wheels of the vehicle and the first and second timer circuits TM.

TM, respectively operate. Here, the timer circuit T of this at and the timer circuit TM of s2 operate individually and measure until the next input is received.Then, the timer circuit TM of % fl is the input condition and 88
The clock time is reset under the reset condition of the tights circuit TM of 2, and the clock time is memorized.Then, the vehicle passes the second wheel detection IIB, that is, the front wheels of the vehicle are connected to the first wheels. When the tape switch of the wheel detector B of s2 is darkened by stepping on the tape switch of the detector AI), the first pulse F of B shown in Fig. 5(a) and (b) is generated. , thereby the second input detection circuit DgT
is activated, and the second timer circuit TM is activated by its output.
, t-reset. Then, the measured time of this second tights circuit TM, the time tv from the pulse F of the 1st look to the pulse F of the 1st look of B (Fig. 5 (a) *
(see b+), and measure the vehicle speed V from the installation interval distance l of the wheel detectors A and H of Ill$P and is2 using the vehicle speedometer 11 times @O8M as shown in equation (4) below.

V=- (4) v The output of this vehicle speedometer@circuit 08M0 is introduced into the next stage minimum distance adjustment circuit MO8MK, and is also outputted.

Therefore, since the axle distance of a large vehicle is generally 5.4 m, the axle distance between the vehicles, that is, the axle distance between the rear axle of the first vehicle and the front wheel of the second &IO vehicle is 5m
0 In this way, after measuring the vehicle speed V, the minimum distance between vehicles is 1l.
On the ils road MO8M, the transit time T of the axle distance between vehicles is determined as shown in equation (5) below.

T=-・・・Fist・(5) However, since the axle distance between Li single cars is p shorter than the axle distance between cars W111IA, the passing time from the front wheel to the rear wheel is shorter than the vehicle axle distance. The axle distance between, that is, after the rear wheels of the first vehicle pass,
The passing time T for the front wheels of the vehicles of the two stations is shorter than the passing time T of the wheelbase.

In this way, after measuring the minimum distance between vehicles, the third timer circuit TM is operated, and the measured time tv of the timer circuit TM of j12 is subtracted from the axle distance ygo transit time T between the vehicles, i.e. , T-1v, that is, the fixed time to after the front wheel steps on the time switch of the wheel detector B of lA2 (see Fig. 5 (a), (k))) 01 o < v- is set. do.

Then, after the third timer circuit TMsKyotsu°C completes the measurement of this certain period of time, its output determines the 10th tie! −
Reset the circuit TM. That is, after a certain period of time to, the last clock of A is cut off, and the end of the last clock becomes the final wheel.

In this way, from the measured time of the timer circuit TM1 of rjI&l, the third timer circuit TM, Noricera F
Find the total time up to the seven-t counting time before the signal.

In other words, in the case of a two-axle vehicle, the time (ts) is determined from the time chart shown in Figure 5(a), and in the case of a three-axle vehicle, the time (ts) is determined from the time chart shown in Figure 5(a).
seek.

Then, the axle distance O1 of the vehicle is determined by the following equation (6).

0j=V-t ・・・・・・・(6) Edashi, t is 2
As the saying goes, an electric axle is 8, and a 3 axle is 11 + 1.The relationship between axle distance CI and vehicle type is shown in Tables 1 and 10 below.

The axle distance obtained in this manner for the Kuning type is stored, and the vehicle type is determined from the measured value.

Next, check the front wheels and rear wheels of the vehicle using the wheel needle IIl Oji 1'MK, copy the axle ** using the axle measurement - @O error, and determine the vehicle type using the vehicle type determination diagram JlOKDK. do.

Then, after determining the vehicle type, output the number, moderation, and vehicle type 0UTt
, iIo Hidden Works: It is difficult to accurately distinguish between different types of vehicles, and it is also difficult to accurately detect the number and speed of the vehicles.

That’s it for real! Although the present invention is explained by taking as an example a case where it is applied to a two-axle vehicle and a three-axle vehicle, the present invention is not limited to this, but is applicable to a multi-axle vehicle with three or more axles, even a four-axle vehicle. It depends on whether you apply it in the same way as in the case of cars.

As can be explained above, according to the present invention, the minimum axle axis WLIIIt between vehicles is determined in advance, and the time to pass the threshold is determined by p1.
Since the axle passing time of the vehicle is short, the front and rear wheels of vehicles with different axles are detected and the axle distance is used to determine the vehicle type. *A, because it is possible to accurately determine the speed and the number of vehicles,
In practice, the O effect is extremely large. It is also extremely effective in that there are no restrictions on the installation of wheel detectors.

[Brief explanation of the drawing]

Figure 1 is a diagram for explaining the principle of conventional vehicle sensing 1IO-example, JllI2E is an explanatory diagram for explaining the operation of conventional vehicle m@, and Figure 3 is the original diagram of the vehicle sensor according to this method. An explanatory diagram, FIG. 4 is a block diagram showing an embodiment of the present invention, 111
FIG. 5 is a time chart for explaining one operation of the embodiment shown in FIG. 114. A, B...φ・Wheel passing detector, TM1~TM,...
・Timer H road, 08M...Vehicle speed needle column rotation! %
MO8M ・°・Minimum faction total 1ii1(9) road, OW
M...Wheel detection circuit, OWAM...Axle measuring circuit, 0KD--Φ/Vehicle type determination circuit 111 Fig. 2 Fig. 3 Chair FRFR

Claims (1)

[Claims] First and jII2 intersecting with the traveling direction of the vehicle on the road.
The wheel passing detectors are arranged in parallel, and the relationship between the installation distance of the first and second wheel passing detectors @l and the inter-vehicle distance between the first and second two-table vehicles Lftl<L is maintained. a timer circuit #Il that operates electrically when the front wheel of the vehicle is detected by the first wheel passing detector; and a second timer circuit that is reset when the front wheels of the vehicle are detected by the second wheel passing detector and the speed V of the second tire is determined. and a third timer circuit for measuring the time required after the front wheels of the vehicle are detected by the twelve wheel passing detectors.
After that, the first timer circuit is reset by the output, and the first timer circuit is set to 1 so that the start of the last time measurement tD becomes the last wheel.
and a means for decreasing the first transit time t from the front wheel of the vehicle to the rear wheel by the first timer circuit. This is determined to be a two-axle vehicle, the second passing time t to the rear wheels of the vehicle is measured, and the first passing time t and the second passing time t are calculated. Added nine stitch column time t
1+t is determined to be a multi-axle vehicle with three or more axles, and K is set so that the number of five vehicle types, speed, etc. can be detected regardless of the number of axles.