CN2260354Y

CN2260354Y - Ditial traffic flow rate detector

Info

Publication number: CN2260354Y
Application number: CN 96200148
Authority: CN
Inventors: 蒋富荣
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-01-04
Filing date: 1996-01-04
Publication date: 1997-08-20
Anticipated expiration: 2006-01-04

Abstract

The utility model belongs to a digital traffic flow rate detector. The utility model is composed of a probe head, a detection circuit and a machine box, wherein, the detection circuit comprises a tuning circuit, a phase-locked ring, a phase comparator and an output circuit. The tuning circuit is formed by parallel connecting an annular coil of the probe head and a capacitor; the output circuit is provided with an analogue output terminal and a digital output terminal. The machine box comprises a machine casing, an upper cover and a rack-typed handle. The digital traffic flow rate detector of the utility model has the advantages of high sensitivity, stable performance, strong interference immunity, compact structure, small size, light weight and convenient use. The utility model can be modified into a multifunctional automated device.

Description

Digital traffic detector

The utility model belongs to a kind of detector, particularly in a kind of traffic detector that shows with numeral.

Along with the continuous development of urban transportation, motor vehicles are increasing, and it is very important that traffic control system seems.The checkout equipment of existing special bus flow is divided into multiple, such as voltage-type, and ultrasonic type, microwave type etc.But all have variety of issue, as count inaccurately, the low or complex structure of sensitivity uses inconvenience or the like.

The purpose of this utility model is to overcome problems of the prior art, proposes a kind of digital traffic detector.

The structure of digital traffic detector of the present utility model is: it is mainly by detection probe, and testing circuit and cabinet constitute, and it is characterized in that:

Described cabinet comprises loam cake, casing and support or handle, gauge outfit, digital indicator, potentiometer, tuner, key switch, power switch, inspection switch and binding post are housed in the casing front, supply hub, fuse, rectifier bridge, socket and binding post are housed at the casing back side; Interior testing circuit plate and the power panel of then being equipped with at cabinet;

Described detection probe is that toroidal inductor is embedded in the underground of crossing, is connected with testing circuit in the cabinet by lead.

Described testing circuit comprises current source, resonant tank, phaselocked loop, phase comparator and output circuit, their collection are contained on the testing circuit plate, wherein toroid winding composes in parallel resonant tank as inductance element and electric capacity, it is connected with phase comparator with phaselocked loop respectively, is connected to the output circuit that can simulate output and numeral output behind phase comparator.

Described current source comprises resistance R 1-R4, capacitor C 1, and C2, transistor T1, T2 and crystal diode D1, wherein resistance R 1 is formed a wave filter with capacitor C 1, and transistor T1 and T2 partner respectively and claim the constant current source of circuit as crystal diode D1.

The major advantage of digital traffic detector of the present utility model is highly sensitive, stable performance, and strong interference immunity, and compact conformation, volume is little, and is in light weight, easy to use.Can repack the device of multifunction automatic in addition into, as the automatic unlatching of garage door, automatic conversion of traffic lights or the like.

Digital traffic measuring instrument of the present utility model is the instrument that is used for detecting motor vehicle (electric car, battery truck, motor tricycle, tractor, the wheeled special-purpose machinery car) number on the road, this instrument critical component is a phaselocked loop, and it is that to utilize motor vehicle (generally be 1.3X2M by the toroid winding that is embedded in below the road ², 4-5 circle, dark 6CM) inductance change (reducing) in resonant tank, produce phase differential, detect by the phase comparator in the phaselocked loop.Detected signal amplified to be sent in the counter after relatively with reference voltage go, thereby obtain numeral intuitively, therefore this instrument can count 9999 continuously because circuit is a two-way, can be simultaneously the vehicle in two tracks of a road be carried out detected components simultaneously.

What this instrument electronics adopted is transistor and integrated circuit, in light weight so the volume of instrument own is little, and counting accurately uses very convenient.

Technical indicator:

Power supply+12V ± 0.5%200mA

Frequency range 20-39KHZ

Sensitivity Δ L/L=10 ^-3

Inductance compensating for variations L=± 5%

Compensation speed several seconds

Inductance (coil) 100 μ H-400 μ H

Vehicle false drop rate＜3%

Using method:

1, buries toroid winding underground

With groover cuts (1.3-1.5) M * 2M on road rectangle, its groove width is about 7mm, and groove depth 60mm, coil are the 4-5 circle, and its inductance parameters is L=100 μ H, direct current resistance R＜1 Ω.Seal with epoxy resin and pitch at last.

2, the corresponding two groups of lines in this instrument rear (orange/blueness with green/blueness) are connected to two groups of lines on the toroid winding below the road, and instrument panel keyswitch LL and LH are put corresponding position.Generally put LL during less than 200 μ H, otherwise put LH at the toroid winding inductance.

3, this instrument rear red line of drawing connects the 12V positive pole, and black line connects a page utmost point, notices that polarity can not wrong, otherwise damages instrument.

4, regulate trim-pot repeatedly, make pilot lamp be in the critical state that extinguishes.Pilot lamp Ying Liang when pressing the top button, and counting press the return-to-zero key then, make number be shown as zero, thereby can normally count.

5, toroid winding is to the available transmission line that is not more than 200 meters between this instrument, and its direct current resistance must be less than 7 Ω.

For further specifying the structure of digital traffic detector of the present utility model, reach embodiment with reference to the accompanying drawings and specifically describe, its accompanying drawing has:

Fig. 1 is the vertical view (having thrown off loam cake) of this detector;

Fig. 2 is the front elevation of detector shown in Figure 1;

Fig. 3 is the testing circuit block scheme of detector shown in Figure 1;

Fig. 4 is the testing circuit figure of detector shown in Figure 1.

In Fig. 1-2: 1 casing, 2 supports or handle, 3 control circuit boards, 4 power panels, 5 supply hubs, 6 fuses, 7 rectifier bridges, 8 sockets, 9 binding posts, 10 potentiometers, 11 digital indicators, 12 gauge outfits, 13 tuners, 14 check switch, 15 binding posts, 16 labels, 17 key switchs, 18 power switches, 19, loam cake is one the 220V alternating current to be transformed to galvanic circuit on power panel 4.

In Fig. 4: R1-R39 resistance, C1-C15 capacitor, T1-T12 transistor, D1-D5 crystal diode, wherein D5 is light emitting diode (LED), IC1 integrated circuit, IC2 input nand gate, the IC3 amplifier, IC4 5V power supply, IC5 digital counter, TP1, TP2, TP3 are pushbutton switch or check switch, TR1 magnetic jar, P1 multiturn potentiometer, J1, J2 short-circuit line, S microswitch, L toroid winding, M simulates output, the output of N numeral, and dotted portion is a current source circuit among the figure.

Embodiment:

Cabinet as shown in Figure 1, 2, by casing 1, loam cake 19 and support or handle 2 constitute, length * wide * height is 300 * 230 * 85mm, in the middle of the positive upper strata of casing, gauge outfit 12 is housed, digital indicator 11 respectively is equipped with in its both sides, in the digital indicator outside potentiometer 10 and tuner knob are housed respectively, in the middle of positive lower floor, key switch 17 are housed, power switch 18 is housed respectively in its both sides, check switch 14 and binding post 15, check switch 14, supply hub 5 is housed successively, fuse 6, rectifier bridge 7 on the casing back side, socket 8 and binding post 9.Testing circuit plate 3 and power panel 4 are housed in casing, be an ac-dc conversion circuit on power panel, its testing circuit as shown in Figure 4, main element wherein such as IC1 are CD4046, IC2 is CD4001, IC3 is LM741CN, and IC4 is CW7805, and IC5 is a digital counter, magnetic jar TP1 is M * D-2000,18 * 11, microswitch 9 is AN42 * 2, and key switch 17 is K2J1-1.

The technical indicator of the digital traffic detector of present embodiment is seen before and is stated.

Claims

1, a kind of digital traffic detector, it is mainly by detection probe, and testing circuit and cabinet constitute, and it is characterized in that:

2, detector as claimed in claim 1, it is characterized in that described testing circuit comprises current source, resonant tank, phaselocked loop, phase comparator and output circuit, their collection are contained on the testing circuit plate, wherein toroid winding composes in parallel resonant tank as inductance element and electric capacity, it is connected with the phaser comparer with phaselocked loop respectively, is connected to the output circuit that can simulate output and numeral output behind phase comparator.

3, detector as claimed in claim 1 or 2, it is characterized in that described current source comprises resistance R 1-R4, capacitor C 1, C2, transistor T1, T2 and crystal diode D1, wherein resistance R 1 is formed a wave filter with capacitor C 1, and transistor T1 and T2 partner respectively and claim the constant current source of circuit as crystal diode D1.