JPS5953998A - System of judging floor surface height of vehicle for vehicle type discriminator - 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 (1) Field of the Invention The present invention relates to a device for determining the type of vehicle using a loop type vehicle detector, a super 7°' single wave type vehicle detector, etc. A method for determining the height of the vehicle floor surface 11 that can accurately distinguish between buses and large objects inside the vehicle (2) Prior art and its problems It is shown in Figure 1. This example uses a loop vehicle detector 1 and an ultrasonic vehicle detector 2. At the same time, the transducer/receiver of the ultrasonic vehicle sensor 2 is installed on one side of the geothermal heat source at an appropriate distance from the loop 3 in the direction of travel of the vehicle 5.

In the well-known loop-type vehicle sensor 1, a loop coil 3 is connected to an inductance *'r- of an oscillation circuit, and when a vehicle 5) passes through this ground, J,
The inductance changes, and as a result of A, the frequency of the oscillation circuit changes. 1. The output of this oscillation circuit is Kawanami -5!
l Den 11 change circuit (ko J, suj'j (-1 gummy month 11
．． (-'I'm going to change the tactance of Ill. 3 to the output of C output.)

Sensepu Jl 't', i + i C' 4.1 middle both 5 right) 1 ((detected (sarudari C・naru, rugu + (ru 3
11 degrees of the body surface of the vehicle "j" passing above (, 111, 15 degrees), "i", 1,
Roots ゛-1 Ile 3 (7) Inductance change (,1
, Vehicle 1) q) Floor ir+i ,! '! , Sagatama culms, therefore sensed! 'A: 'l's output power j1 is vehicle 3
i (7) The lζ level corresponds to the floor height.

, 1,) In the well-known J, ・), the ultrahigh wave formula Φ both values') 41
The device 2 sends out ultraf' wave pulses from the ultrasonic wave transmitter 11 toward the road surface, or from the large lunar surface. 1 wave is detected by the transducer 4. In addition, if it is possible to detect the absence of the vehicle 5j, then the principle of ultrasonic distance measurement (゛medium + 5 height detection) be able to.

31, the length of the vehicle 5) is the distance H11 () 11 and installed 2-) Iha sensor '1.2r same 11, l
It is possible to detect a vehicle and determine whether the vehicle has a length L or more or a vehicle with a length L or less.

'lit Mi 1! II Follow C1 Medium Fireplace 1111
Based on the outputs of sensors 1 and 2 at position H (3?
The height of the vehicle is classified into 3 stages along with the stage jjlj (5 minute square height), and from this + 3 combination μ, medium and small L1j for East use.
1 human type 9°j 1'Ir, 1, /, -4, 1 lotus, 3゛] (classified as a hand).

Loop-type vehicle detector '1 distinguishes between large cargo and buses.
Information on the vehicle floor height obtained from 1Xg is carried out.
lj Compared to other animals, the floor height of buses is lower;
-+ The inductance change rate of 1' and 3 is very low.) Now! There is a version C that was published once.

Conventionally, in order to distinguish between a large freight vehicle and a bus, the level of the analog output voltage of the loop vehicle sensor 11 is discriminated using one appropriately set threshold value, and the output voltage of the earth floor exceeds the above threshold value. If so, the vehicle is determined to be a lotus, and if not, it is determined to be a person! Isfq is being judged in animals.

However, this conventional determination method has the following drawback:
・(D It.

riyonakaka・)ノJ11 Vehicle floor surface 6゛II is generally popular, and it is equivalent to 1 bus. i ino (there is, but person!, 1′!l
On the floor of the building, there is a part of the horn that appears on the floor. There are many changes in intactance.

Figure 3 shows an example of the output waveform of the Roots-type vehicle sensor 1 for four small samples (in the same figure, △ is a general bus detection signal;
3μ This is a detection signal for general large cargo. 1J in the same figure
, -), the detection signal of a large object in a large object fish ""J li's body, the I novel is a bus detection signal] Detection inside objects; Lj
l','t←2(,1,j゛ifno range(・rugi t
'110 pulse 1 with a width of 7'
The beak of ノ(is included.This 15th,'1゛)'s σ(ll'l(-゛shil\ruble rparting 4. is a large n object and a bus l'i 'i IQ good minute 5:i”l
LJ is easy to understand (Saru(a/)・
),.

(3) Purpose of the 5 points The 1:1 point of this defense is that the above-mentioned J, Umu vehicle type identification device (G, It is very convenient to provide 11 formulas for determining vehicle floor height.
(4) Structure and effects of the invention J-iiL! [1] In order to achieve the target, this y(light(
,; 2. Loop-type vehicle detector j'] 1-i Jj
J, and the time during which the threshold of the above ^ level is exceeded [2
and means for obtaining the above time-11 and time-1 respectively.
-2 ratio (means for determining the height of the passage width and the height of both floor surfaces).

According to this method, A() i' range 1 in the large item
/ Lugia part J: Eel local 'J: 1. It is possible to detect the difference in the overall floor height of the bus and the bus without being affected by the tension, so it is possible to detect the difference between the bus and the bus. Can be classified.

(5) Description of the Embodiment FIG. 4 is a block diagram C of a vehicle floor height determination circuit to which this technology is applied, and FIG. 1~.

Lou 1 generation Φ both (forecaster ゛1 of 77) - log output voltage V
a is the 1-1 cibarator 11 which is inputted to the 1-barret 1 'il J J and 12 of 2').
．． - is added to j, and the comparison of 21 member / J i 2 is a high level of human power.
The level of the output electric power is discriminated by the knee 1 comparators 11 and 12, respectively. .

1) As shown in the example shown in Figure 1, the output city 1. IV a
When the low level exceeds the low level Mj S L-, the output X'I of the inverter 11 becomes 1 level, and the output type 1. 'E V aka history [, 2nd high school 1 novel threshold S
When H is exceeded by 6, the output x 2 of the 11 comparator 12 becomes 1-Level. Note that the output x 1 of the 21 comparator '11 indicates the vehicle's illumination and becomes the detection output. When d is applied to the counter 31, the ivy pulse CP is introduced into the counter 31, and the counter 3 i 1. The L output x 1 becomes 1 level and -11''8 is counted by ^1, which is 4.

Similarly, if the output x 2 is 1 lehel (・, then goo h 2
2 through 1] Tsuku pulse CP is a force "9 people are added to sink 32, counter 32 output x 2 becomes 1 level -)
(Time-r2=t'I-112t3+1
．． /I becomes i1^'i rJ.

The 11I number outputs of counters 31 and 32 are [)/A, respectively.
Analog conversion is performed by converters 4.1 and 42, and I]7,'
From △ converters 41 and 42, the front 1 and j! ll,
! Electric currents Vl and V2 proportional to 1'1°T2 are output between j.

The vehicle detection output is b rh (t'! shi)
0 will be replaced by 5 people. From the pulse generator 70, as shown in FIG. Outputs 1. This pulse signal P1 is used as a timing signal for a NO judgment output, which will be described later. ')1
2.

Further, the pulse signal 1]1 is inputted to a pulse generator 75 consisting of an 11 stable multi-viral generator. As shown in FIG. 5, this pulse generator 75 generates pulses 11'' of minute width in response to the falling edge of the pulse signal P1.
Vj l) 2 is output 1, this pulse signal [) 2
is applied to the relays 1 to 1 of the counters 31 and 32.

1) The voltage V'1 output from the /△ transformer 41 is changed by the variable resistor G O'C, and the voltage β is increased by that amount JJ.
V-+ (0・, β<'I) and 1)/'△ transformer/1
The electric currents J and t' V2 outputted from the two are compared by the second comparator 50c.

(, output type 1r of small mountain sensor 1, 'Va level is sufficiently high overall, but high level threshold value S1
C++, which exceeds 1,) between 1" and 2 will also be relatively large,
As a result, the output of the inverter 5o becomes a level 1, this one (J34 , 31]
When I becomes light 1, it inverts the output of 1.1 inverter 5) 0!I inverts the output of inverter 0 at f30 I+: :'j
4. The output of the receiving gate 91 becomes 111 novels,
The output voltage for determining whether the low height of the lotus chi is 11 is 5゜l.
Although the tenth average of a is relatively low, the ratio of time -1-2 to time -1-1 becomes small, and as a result, βV
1 > V '2 The output of the 1-level amplifier Q is 1-level, and in this state, when the pulse signal P1 is 1 light, the output of the 1-9 level is 1 to 9.
The horn of 2 makes a 1-level sound, and the horn for judgment is generated without indicating that there is a raised floor of snow in the person 41111.17.

In this way, the output voltage V; I is at a low level of 31
The time T1 exceeds
The ratio of the time T2 exceeding S I-1 (as it determines whether the floor is low, middle, or high floor is affected by the gamma angle and lugia parts in large cargo), and the overall floor surface Based on height ("Large freight vehicles and buses can be neatly classified.

J3, the above analog log output is low 1 level.
A means for determining the time 'r1 J3 exceeding -1111 and the time -r-2 exceeding the high level threshold 1111, respectively. (The means for determining and overturning the height of the floor surface of passing vehicles is to use dedicated hardware such as the one described in Mr. Sono 1~
1 no' place Jjlj J, -) - < b same as (, - real J
l,j jl is Csar.

[Brief explanation of drawings]

Figure 1 (3) A small diagram of the principle of the vehicle identification device that is 24 K!
Figures 9 and 9) show an example of the output waveform of the roots vehicle sensor '1. An example is shown in Fig. 5, which shows the operating waveforms of the JJ GJ platform in Fig. 4.・・Mj ;'+, both vehicle values in wave type; H3...Loop 1 (Le 4...) Pass i skin: (:: 5...Medium thickness i i, 'l 2. !J ()...21 inverter 1: + ii'l out) 911 people

Claims (1)

[Claims] (1) A loop-type vehicle sensor is placed on the road surface on which the vehicle passes, and the sensor is placed on the floor surface 1 of the vehicle passing through the loop. The detection output of the log correlated to 'il j> is i! f'(,) of i-yen and 1-b's 4.
1.1 level (of the sensor) 'no log output, but 2 levels of low level discrimination (each ε' level discrimination means, passing - vehicle - C1) Ft analog output exceeds the low level threshold (the time "I' 111
3J, exceeded the previous high level Shisai candy (time ``2''
(ν) and the +1.'1 interval T'1
Based on the ratio of time and time ゛I2
A method for determining vehicle floor surface roughness using a medium type discriminating device that includes a means for determining the height and lowness of the vehicle, 1