CN1164449C

CN1164449C - Equipment for distinguishing passenger train from goods train by betwene-carriage gap counting method

Info

Publication number: CN1164449C
Application number: CNB021178674A
Authority: CN
Inventors: 谈春明; 张玉爱; 刘锡明; 吴志芳; 周立业; 向新程; 安继刚
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2002-05-24
Filing date: 2002-05-24
Publication date: 2004-09-01
Anticipated expiration: 2022-05-24
Also published as: CN1378936A

Abstract

The present invention relates to a device for distinguishing a passenger train from a goods train by a carriage-gap counting method, which belongs to the technical field of the automatic recognition of railway passenger trains and goods trains. The present invention is characterized in that the present invention uses two wheel passive magnetic sensors to determine the total length of the carriages to be counted; a photoelectric sensor arranged between the two wheel passive magnetic sensors is used for dynamically measuring the number of gaps between carriages; as for a passenger train, only the gap between a locomotive and a first carriage is a first pulse; because the passenger train is penetrative, and measuring light rays can not pass, no gap pulse is output; a gap with the length of about half a meter is formed between carriages of a goods train; therefore, when the gap pulses measured in the total length of the carriages by the two magnetic sensors are larger than or equal to a threshold value of preset number of gaps, the goods train is recognized; otherwise, the passenger train is recognized; however, the start and the stop of counting are determined by arriving signals of wheels transmitted by the two magnetic sensors. The present invention correspondingly provides a device which is composed of a photoelectric sensor, two magnetic sensors, a magnetic sensor signal processing circuit, a programmable controller, an output LED display screen and a power supply. The present invention can work outdoors at-40 DEG C. Moreover, the interference resistant capability of the present invention is high.

Description

The device of distinguishing passenger train from goods train by betwene-carriage gap counting method

Technical field

The device of distinguishing passenger train from goods train by betwene-carriage gap counting method belongs to passenger train lorry automatic identification equipment field.

Background technology

⁶⁰Co railway truck On line inspection system transports the characteristics of checking and the system of a kind of efficient, reliable, the strong usefulness of developing of cracking down on smuggling in order to adapt to railway port, border.But the rail inspection station in some customs, the shared track of passenger and freight car, and only need check lorry, therefore need a kind of On line inspection device that can automatically identify passenger and freight car.

Also there is not at present the special device of discerning automatically at passenger and freight car.Existing rolling stock automatic identification equipment is all discerned at rail vehicle model and license number.As application number be 92210541, Granted publication number is 2120741, the patent of " rolling stock automatic identification equipment " by name, it is installed in signal generator below the train base plate; And for example application number is 89105199, publication number is 1051330, the patent of " rail vehicle automatic recognition system " by name, form as the several sections such as receptor, interface board and control computer of sensor as projector, the Hall element of emissive source by the permanent magnet that adopts two scale notation to encode, the coding transmitter is installed under the truck spring frame, and receptor is installed on the rail outside and the corresponding ground of transmitter.Their common ground all is at the vehicle ad-hoc location check implement to be installed, and discerns rail vehicle model and license number.But in case they are installed on the train of external immigration, because we can not carry out unified management to external train, so these devices are inapplicable.

Summary of the invention

The object of the present invention is to provide a kind of device of gap, compartment method identification passenger train lorry of the equipment of installation and measuring ON TRAINS.It discerns the passenger vehicle lorry by the compartment is counted at interval.This is that available photoelectricity correlation method produces railway car count pulse at interval because between the boxcar the general interval that has half meter; And all be communicated with between passenger car, use opto-electronic pickup survey nothing counting droped beat to dash and produce.First pulse also can be triggered in the consideration passenger vehicle and the locomotive of lorry and the gap between the first segment compartment, uses photoelectricity can produce impulse singla to shooting method to the train in the walking, and it is first counting.Thereby if can accurately obtain the compartment space-number, then the overall pulse counting is 1 interval scale passenger vehicle, then is lorry greater than 1 o'clock.For increasing the accuracy of judgement degree of equipment, can establish 6 to 8 car length intervals, choose 3～5 threshold values as a comparison.In one section distance that comprises several compartments, if the counting in gap, compartment is defined as lorry more than or equal to threshold value, otherwise, be passenger vehicle.Consider that passenger vehicle at the accidental slit counting that some extraordinary circumstances produces, can make system that very strong antijamming capability is arranged with the threshold value comparison method.

The invention is characterized in: it contain two be installed on the inboard and distance therebetween of rail according to gap, the compartment number of actual needs statistics fixed Magnetic Sensor, photoemitter and receptor are between above-mentioned two sensors, be arranged in the rail outside, detect light satisfy can only be from the gap, boxcar by and can not from compartment and passenger car gap, pass through, the magnetic sensor signal treatment circuit that input end links to each other with above-mentioned two Magnetic Sensor mouths, the Programmable Logic Controller that input end and above-mentioned magnetic sensor signal treatment circuit mouth link to each other with above-mentioned photelectric receiver mouth, the read-out and the power supply that link to each other with above-mentioned Programmable Logic Controller.Described Programmable Logic Controller is Siemens Programmable Logic Controller PLC224.The magnetic sensor signal treatment circuit is to be made of two voltage followers that GXC9801 module and each personal chip LM324 of linking to each other with its mouth constitute.Magnetic Sensor is a GXDM-H/D type disturbance rejection Magnetic Sensor.

Description of drawings

Fig. 1 is that sensor is along the inboard distribution graph of rail.

Fig. 2 is the schematic block circuit diagram of device.

Fig. 3 is a magnetic sensor signal treatment circuit schematic diagram.

Fig. 4 is an opto-electronic pickup inclination scheme of installation.

Fig. 5 judges the diagram of circuit of usefulness for passenger train from goods train.

Fig. 6 is a program flow chart.

The specific embodiment

In Fig. 1,1,2 is respectively the Magnetic Sensor that is used to determine gap, the compartment number added up; The 3rd, the photoelectric sensing projector; The 4th, the photoelectric sensing receptor; The 9th, rail.Be that

Magnetic Sensor

1,2 is determined sampling interval with 200 meters two wheel sensores of being separated by now, opto-

electronic pickup

3,4 is positioned at the mid point of sampling interval.No matter the train upstream or downstream are the initial moment with the magnetic sensor signal that at first triggers, and the triggering of another Magnetic Sensor be end mark constantly, and the droped beat of statistics correlation opto-electronic pickup in the time period of this train operation dashes and counts.Because train is not counted before arriving photoelectricity correlation position, actual count be compartment space-numbers in 100 meters length over ends of body.Usually, the car length of lorry is 12 meters, and statistics comprises 100 meters vehicle commander of locomotive, and lorry should have 6～8 gap impulse singlas, and the first pulse of passenger vehicle behind locomotive of same length, does not have the gap impulse singla between the compartment again.Consider that locomotive head length and boxcar do not wait, different boxcars length also there are differences, and the step-by-step counting at interval of actual compartment within the specific limits.If establishing threshold value is 4, then interval, compartment sum was defined as lorry more than or equal to 4 o'clock, was lower than at 4 o'clock and provided the passenger vehicle recognition result.Passenger and freight car can be distinguished reliably with the threshold decision method, the erroneous judgement of avoiding external interference to produce.The statistics in typical case highway section when threshold value is made as 4 countings, this device accurately can reach 100% to passenger-cargo identification.The visual field condition of this threshold value can be adjusted up and down.

Goodbye Fig. 2, the vertical dimension of gap, compartment photelectric receiver 4 is in more than the floor compartment and the position below the vehicle

window.Wheel sensor

1,2 usefulness GXDM-H/D type disturbance rejection Magnetic Sensors, the signal that it provides wheel to arrive is installed in the rail inboard, is used for determining between the count block of passenger and freight car compartment pulse.The millivolt signal that it obtains can convert the logic level of 0/24V by the magnetic sensor signal treatment circuit 5 with module GXC9801 system to.When not having wheel to pass through, be output as the high level of 24V, the negative going pulse of wheel by a 0V of time output arranged.The 6th, Programmable Logic Controller PLC224, it input end I0.1, I0.2 receive

wheel sensor

1,2 outputs and through the wheel arriving signal of magnetic sensor signal treatment circuit 5 conversion, its input end I0.3 receives the output signal of photelectric receiver 4, is high level when light path is obstructed, otherwise; Be low level.Mouth Q0.1, the Q0.2 of PLC224 be output signal " 1 " or " 0 " respectively, delivers to output LED indicator panel 7 (KH-2A types), and representing recognition result respectively is lorry or passenger vehicle.The 8th, the 24V power supply.

In Fig. 3, the MAG1+ of module GXC9801 and MAG1-, MAG2+ and MAG2-are respectively the receiving ends of the output signal of

wheel sensor

1,2, through becoming the output of magnetic sensor signal treatment circuit behind the voltage follower with chip LM324 system, signal Out1, Out2 are sent to I0.1 and the I0.2 end of PLC224 respectively.The VREF end of module GXC9801 is used to regulate the magnetic sensor signal sensitivity.

In the present embodiment, detect light and depart from the rail vertical direction slightly, see Fig. 4.The distortion angle θ of photoelectricity correlation direction and rail vertical direction is by the upperlimit decision of the small gap width that needs filtering.θ=TAN ^-1(d/W) according to geometric relationship, d is a small gap upper limit width, and W is a box width.Compare over against the rail mounting means with detecting light, it can the filtering train body on width less than the small gap of d.

Now Fig. 5 is described in conjunction with Fig. 6.Default following variable: train directions Direction_Train when initialization, allow counting Permit_Count, finish counting End_Count, count results Count_Number=0, lorry judged result Freight_Train and judgment threshold Threshold_number.

The incoming signal of 2 sensors that read from PLC digital signal input end I0.1, I0.2 deposits variable Mag_Sensor1 respectively in, and among the Mag_Sensor2, the signal of the photelectric receiver 4 that input end I0.3 reads in deposits among the variable Photo_Sensor.Mag_Sensor1, Mag_Sensor2 are for triggering the maintenance variable, and Photo_Sensor is the pulsimeter digital variable.When train passed through, according to the different travel direction of train, Mag_Sensor1, Mag_Sensor2 wherein had a variable to be triggered earlier, put simultaneously to allow counting variable Permit_Count=1, allowed input end I0.3 signal to begin step-by-step counting.Because the installation site of

Magnetic Sensor

1,2, locomotive arrives the droped beat that just provides between each compartment behind the opto-

electronic pickup

3,4 and dashes.Simultaneously, the pulse that at first is triggered among Mag_Sensor1, the Mag_Sensor2 can corresponding up-downlink direction.If Mag_Sensor1 triggers earlier, definition Direction_Train=1 is up direction, when treating that Mag_Sensor2 is triggered, puts End_Count=1; If Mag_Sensor2 triggers earlier, definition Direction_Train=0 is down direction, treats to put End_Count=1 when Mag_Sensor1 is triggered, and the step-by-step counting of PLC input end I0.3 is stopped.Then Count_Number and Threshold_number are compared, if Count_Number more than or equal to Threshold_number, puts Freight_Train=1, recognition result is a lorry; Otherwise then be passenger vehicle.It is 1 that Freight_Train=1 puts PLC output Q0.1 port, and the output recognition result is a lorry.Port is 1 if Freight_Train=0 puts PLC output Q0.2, and the expression recognition result is a passenger vehicle.

This shows that this device can be discerned passenger train from goods train just under steam, and antijamming capability is strong, more can under-40 ℃ of outdoor environments, works.This is by the low temperature resistivity of Magnetic Sensor, non-transformer decision.

Claims

1. the device of distinguishing passenger train from goods train by betwene-carriage gap counting method, contain opto-electronic pickup and signal processing circuit, it is characterized in that: it contain two be installed on the inboard and distance therebetween of rail according to gap, the compartment number of actual needs statistics fixed Magnetic Sensor, photoemitter and receptor are between above-mentioned two sensors, be arranged in the rail outside, detect light satisfy can only be from the gap, boxcar by and can not from compartment and passenger car gap, pass through, the magnetic sensor signal treatment circuit that input end links to each other with above-mentioned two Magnetic Sensor mouths, the Programmable Logic Controller that input end and above-mentioned magnetic sensor signal treatment circuit mouth link to each other with above-mentioned photelectric receiver mouth, the read-out and the power supply that link to each other with above-mentioned Programmable Logic Controller.

2. the device of distinguishing passenger train from goods train by betwene-carriage gap counting method according to claim 1, it is characterized in that: described Programmable Logic Controller is Siemens Programmable Logic Controller PLC224.

3. the device of distinguishing passenger train from goods train by betwene-carriage gap counting method according to claim 1 is characterized in that: described magnetic sensor signal treatment circuit is to be made of two voltage followers that GXC9801 module and each personal chip LM324 of linking to each other with its mouth constitute.

4. the device of distinguishing passenger train from goods train by betwene-carriage gap counting method according to claim 1, it is characterized in that: described Magnetic Sensor is a GXDM-H/D type disturbance rejection Magnetic Sensor.