CN103640596A - Axle counting system and axle signal processing and axle counting method used for same - Google Patents
Axle counting system and axle signal processing and axle counting method used for same Download PDFInfo
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- CN103640596A CN103640596A CN201310603307.6A CN201310603307A CN103640596A CN 103640596 A CN103640596 A CN 103640596A CN 201310603307 A CN201310603307 A CN 201310603307A CN 103640596 A CN103640596 A CN 103640596A
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Abstract
Provided are an axle counting system and an axle signal processing and axle counting method used for the same. The system comprises a wheel sensor, an analog/digital (A/D) converter and a digital signal processor (DSP). The wheel sensor outputs an axle counting signal to the A/D converter, and the axle counting signal is subjected to analog/digital conversion through the A/D converter and then output to the DSP. The method includes that analog axle counting signals output by the axle counting sensor are subjected to digital quantization through the A/D converter and output to the DSP, and the DSP conducts identity recognition on two signals. Conditions for judging waveform similarity of the two signals include that (1) the deviation of time width of two pulses is at most 20%; (2) the two signals must have an overlapped portion which exceeds 1/3 of the whole pulse; (3) the front end and the rear end occupy over 1/6 of the whole pulse besides the overlapped portion. Under the normal condition, axle counting is conducted the same as an original system, axle loss cannot happen even signals are weakened to a certain degree, but the original system loses axles when the signals are weakened to the certain degree.
Description
Technical field
The present invention discloses a kind of axle counting system and processes and axle counting method for the axis signal of this axle counting system, meter shaft more accurately while making axis-counting device face complicated field condition, the reliability and the safety that improve axis-counting device.
Background technology
Rail transportation occupies very important position in people's daily life, in the transportation of land route, occupies very large proportion.Because rail transportation belongs to track traffic, because its operation scheme adopting is more special, therefore also very high to the requirement of its running environment etc., the particularly important is at one time, on same lengths of rail route, can only there is a row train to exist.At present, the means that exist for detection of train on rail that are widely adopted are exactly track circuit, track circuit is to take the rail of a lengths of rail circuit to be the circuit that conductor forms, for automatic, this section of circuit of continuous detecting, whether by rolling stock, taken, also for control signal device or switching device, to guarantee the equipment of traffic safety.But track circuit can not adapt to all environment, such as at moist and few section of driving a vehicle, because rail gets rusty, can cause track circuit to detect shunting badness, become great potential safety hazard.So at the section with a switch or switches of subway and large iron, generally adopt now axis-counting device.
The groundwork of axis-counting device is based on to sailing and roll away from the comparative result of the track section wheel number of axle that timing point monitors into, with this, determine taking of this section or idle condition, be check track section, track switch, crossing protection section takies or the safety apparatus of idle condition.As shown in Figure 1, train sails into from the A end of monitored section the principle of axle counting system, and counting the number of axle is CA, and train rolls away from from the B end of monitored section, and counting out the number of axle is CB.When CA is not equal to CB, represent that this section is occupied; When CA equals CB, represent that this section is idle.
General axis-counting device can be loaded onto wheel sensor at the timing point place of rail, wheel can detect two paths of signals through out-of-date wheel sensor, after amplifying full line processing, be formed with overlapping one in front and one in back two pulse signals, this signal gives hardware again or software is counted, and its process please refer to accompanying drawing 2.
If the treating process in Fig. 2 is the core of axle counting system, complete the counting of train wheel shaft.Shaping pulse link completes with comparator, its threshold is fixed, and when wheel horizontal direction swings while jumping on excessive or wheel, the signal that sensor is surveyed all can be very weak, by shaping link, probably can not get the axle impulse singla needing like this, will cause and lose axle.And if lower the threshold, may when there is no pulse, produce again pulse, cause misoperation, therefore lose in this case axle and just become inevitable.Wherein, Fig. 3 is the signal graph that while normally crossing car, sensor detects, Fig. 4 is that wheel horizontal direction swings the signal graph that while jumping on excessive or wheel, sensor detects, although its signal shape is few with NMO (normal moveout), but amplitude is much smaller, for fixing threshold, through shaping pulse afterpulse, may just not have, will produce like this and lose axle phenomenon.
Summary of the invention
For the above-mentioned wheel sensor of the prior art of mentioning, at the signal that wheel is jumped axle or the wheel amplitude of oscillation is excessive to be caused while waiting, weaken, easily produce the shortcoming of losing axle phenomenon, the invention provides a kind of newly
The technical scheme that the present invention solves its technical matters employing is: a kind of axle counting system, and system comprises wheel sensor, A/D converter and DSP, wheel sensor output axle-counting signal, to A/D converter, is exported to DSP after A/D converter carries out analogue to digital conversion.
A kind of axis signal for above-mentioned axle counting system is processed and axle counting method, the method is for carrying out digital quantization by A/D converter by the simulation axle-counting signal of axle count sensor output, and export to digital signal processor, by digital signal processor, two paths of signals is carried out to similarity identification, the condition of two signal waveform similaritys of judgement comprises:
(1), two-way pulse time width, deviation is no more than 20%;
(2), two paths of signals must have overlappingly, and lap will surpass 1/3 of overall pulse ratio;
(3), except overlapping region, the ratio that rear and front end accounts for respectively overall pulse will surpass 1/6.
The technical scheme that the present invention solves its technical matters employing further comprises:
Between described wheel sensor and A/D converter, be connected with linear optical coupling isolation module.
Described system also comprises a road shaping pulse module, wheel sensor is exported axle-counting signal simultaneously and is carried out exporting to linear optical coupling isolation module after shaping pulse to shaping pulse module, after linear light-coupled isolation module, export to counting module and carry out step-by-step counting, then count results is exported to DSP.
Described axle count sensor output signal is divided into two-way, and A/D converter is exported on a road, and axle step-by-step counting is directly carried out on another road after shaping pulse, and two kinds of technical result are merged according to certain algorithm, and merge algorithm is as follows:
(1), take axle step-by-step counting as main, using its result as count results;
(2) if having counting by A/D sampled signal, see that whether it is very short from the time of a upper axle step-by-step counting, if very short, A/D sample count is ignored, otherwise whether the interval of seeing again next axle step-by-step counting and this A/D sampled signal is very short, if very short, this A/D sample count is ignored, otherwise using this A/D sample count result as count results.
Described A/D sampled signal and the interval time of a upper axle step-by-step counting are less than 5ms, think that its interval time is very short.
Described A/D sampled signal and the interval time of next axle step-by-step counting are less than 5ms, think that its interval time is very short.
The invention has the beneficial effects as follows: in actual applications to adopting axle counting system of the present invention to carry out DCO, reached the effect of anticipation: i.e. correct meter shaft the same as original system under normal circumstances, a little less than signal, also do not lose to a certain extent axle, and original system can be lost axle.Arbitrary road fault wherein in two-way, can reach the effect that is not less than original system in addition, has improved reliability.
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Accompanying drawing explanation
Fig. 1 is axle counting system principle schematic.
Fig. 2 is axle counting system workflow diagram in prior art.
The signal schematic representation that when Fig. 3 is normal car excessively, wheel sensor detects.
Fig. 4 is that wheel horizontal direction swings the signal schematic representation that while jumping on excessive or wheel, wheel sensor detects.
Fig. 5 is workflow diagram of the present invention.
Fig. 6 is expansion structure workflow diagram of the present invention.
The specific embodiment
The present embodiment is the preferred embodiment for the present invention, and other all its principles are identical with the present embodiment or approximate with basic structure, all within protection domain of the present invention.
In the present invention, protect a kind of axle counting system, it mainly comprises wheel sensor (or being called axle count sensor), A/D converter and DSP, and wheel sensor output axle-counting signal, to A/D converter, is exported to DSP after A/D converter carries out analogue to digital conversion.In the present embodiment, between wheel sensor and A/D converter, be connected with linear optical coupling isolation module, can carry out the isolation of high-low pressure signal.
Above-described embodiment is the simplest embodiment of the present invention, during concrete enforcement, an all right road shaping pulse module in parallel, wheel sensor is exported axle-counting signal simultaneously and is carried out exporting to linear optical coupling isolation module after shaping pulse to shaping pulse module, after linear light-coupled isolation module, export to counting module and carry out step-by-step counting, then count results is exported to DSP.
Please refer to accompanying drawing 5, the present invention is directed to wheel and jump the phenomenon that axle or wheel amplitude of oscillation sensor signal excessive etc. and that cause weaken, the present invention looks for another way, adopt the signal different from conventional method to process and axle counting method, it avoids using the fixedly way of threshold comparator, but by A/D converter, the simulation axle-counting signal of axle count sensor output is carried out to digital quantization, be about to analog signal and convert digital signal to, then digital signal is input in digital signal processor (being DSP), by digital signal processor, two paths of signals is carried out to similarity identification.By axle counting method of the present invention, even if axle-counting signal does not reach original threshold, but by DSP process see in the same old way draw this be wheel up through the signal of out-of-date generation, just can normally carry out meter shaft.In the present embodiment, whole A/D sampling, the processing of two paths of signals recognizer and counting etc. are all realized with software by DSP.
Adopt the axle counting method in the present invention, the result of meter shaft not exclusively depends on amplitude, as long as amplitude is not less than flagrant degree, two signal waveform similaritys meet certain condition, just can realize meter shaft.In the present invention, consider the complexity of practical situations, the condition of two signal waveform similaritys of judgement can be summarized as follows:
1. if when the speed of a motor vehicle surpasses 50 kilometers/hour, two-way pulse time deviation is no more than 20%.
When the speed of a motor vehicle is very slow, the sampled signal time is longer, disturbs and is difficult to maintain so long-time, therefore need not consider.And when the speed of a motor vehicle is when very fast, by axle count sensor so a bit of apart from time, can think at the uniform velocity, deviation is no more than 20% 1 and meets surely.
2. two paths of signals must have overlappingly, and lap will surpass 1/3 of overall pulse ratio.
3. except overlapping region, the ratio that rear and front end accounts for respectively overall pulse will surpass 1/6.
Above-described embodiment is the simplest embodiment of the present invention, during concrete enforcement, can also adopt other preferred embodiments, please refer to accompanying drawing 6, in the present embodiment, the detectable signal of axle count sensor output is divided into two-way and carries out independent processing, wherein meter shaft is carried out by commonsense method traditional in prior art in a road, another road adopts the method for the above-described embodiment in the present invention meter shaft of sampling, two paths of signals carries out respectively independently meter shaft counting, and then two kinds of technical result are merged according to certain algorithm, in the present embodiment, merge algorithm is as follows:
1. take plain shaft step-by-step counting as main, this adds its result an axle and just adds an axle, and this subtracts an axle and just subtracts an axle, no matter the result of counting by sampled signal.
2. if having counting by sampled signal, see that so it,, from the time whether very short (in 5ms) of a upper plain shaft step-by-step counting, is sample count to be ignored, explanation is the counting of same signal.Otherwise seeing next plain shaft step-by-step counting interval with it whether very short (in 5ms), is sample count to be ignored again, also explanation is the counting of same signal.If interval surpasses certain hour (such as 5ms), explanation is and passes through the different signal of plain shaft step-by-step counting, should be counted.
The result merging by above algorithm is exactly:
1. the meter shaft obtaining by plain shaft step-by-step counting under normal circumstances at signal is correct.And count by sampled signal, can only be also to have signal to count, by sure the accomplishing under same signal between the two every being no more than certain hour (such as 5ms) of processing speed of DSP.The result obtaining by plain shaft step-by-step counting is like this exactly the result after merging.
2. if signal is very weak, by plain shaft step-by-step counting, no meter is not upper, and has counted by sampled signal, and the two interval necessarily surpasses (such as 5ms) sometime, and such axle just can be counted according to merge algorithm, and end product just can not lost axle.
As seen from the above, by method of the present invention and algorithm, the axle problem of losing that necessarily more weak signal can be caused solves.By sample count just can surpass plain shaft step-by-step counting, only only by sample count, solve the problem of losing axle in fact separately.After adopting above way, if a road hardware fault wherein, another road also can work alone, so not only solved, loses axle problem, and hardware reliability is also improved.In the present embodiment, it is the speed of a motor vehicle of considering by 450 kilometers/hour that interval time is got 5ms, two nearest wheel shaft sigtnal intervals are more than 10ms, independently count same signal is gone out to result in 5ms for such two, be that same signal causes with regard to being enough to differentiate the counting on both sides, or unlike signal causes, during concrete enforcement, also can choose other numerical value according to actual conditions, as long as it can judge that the counting on both sides is that same signal causes, or unlike signal causes.
In actual applications to adopting axle counting system of the present invention to carry out DCO, reached the effect of anticipation: i.e. correct meter shaft the same as original system under normal circumstances, a little less than signal, also do not lose to a certain extent axle, and original system can be lost axle.Arbitrary road fault wherein in two-way, can reach the effect that is not less than original system in addition, has improved reliability.
Claims (7)
1. an axle counting system, is characterized in that: described system comprises wheel sensor, A/D converter and DSP, and wheel sensor output axle-counting signal, to A/D converter, is exported to DSP after A/D converter carries out analogue to digital conversion.
2. axle counting system according to claim 1, is characterized in that: between described wheel sensor and A/D converter, be connected with linear optical coupling isolation module.
3. axle counting system according to claim 1 and 2, it is characterized in that: described system also comprises a road shaping pulse module, wheel sensor is exported axle-counting signal simultaneously and is carried out exporting to linear optical coupling isolation module after shaping pulse to shaping pulse module, after linear light-coupled isolation module, export to counting module and carry out step-by-step counting, then count results is exported to DSP.
4. the axis signal for axle counting system of the employing axle counting system as described in claim 1 or 2 or 3 is processed and axle counting method, it is characterized in that: described method is for carrying out digital quantization by A/D converter by the simulation axle-counting signal of axle count sensor output, and export to digital signal processor, by digital signal processor, two paths of signals is carried out to similarity identification, the condition of two signal waveform similaritys of judgement comprises:
(1), two-way pulse time width, deviation is no more than 20%;
(2), two paths of signals must have overlappingly, and lap will surpass 1/3 of overall pulse ratio;
(3), except overlapping region, the ratio that rear and front end accounts for respectively overall pulse will surpass 1/6.
5. the axis signal for axle counting system according to claim 4 is processed and axle counting method, it is characterized in that: described axle count sensor output signal is divided into two-way, A/D converter is exported on one tunnel, axle step-by-step counting is directly carried out on another road after shaping pulse, two kinds of technical result are merged according to certain algorithm, and merge algorithm is as follows:
(1), take axle step-by-step counting as main, using its result as count results;
(2) if having counting by A/D sampled signal, see that whether it is very short from the time of a upper axle step-by-step counting, if very short, A/D sample count is ignored, otherwise whether the interval of seeing again next axle step-by-step counting and this A/D sampled signal is very short, if very short, this A/D sample count is ignored, otherwise using this A/D sample count result as count results.
6. the axis signal for axle counting system according to claim 5 is processed and axle counting method, it is characterized in that: described A/D sampled signal and the interval time of a upper axle step-by-step counting are less than 5ms, thinks that its interval time is very short.
7. the axis signal for axle counting system according to claim 5 is processed and axle counting method, it is characterized in that: described A/D sampled signal and the interval time of next axle step-by-step counting are less than 5ms, thinks that its interval time is very short.
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| CN201310603307.6A CN103640596B (en) | 2013-11-25 | 2013-11-25 | A kind of axle counting system and for the axis signal process of this axle counting system and axle counting method |
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| CN201310603307.6A CN103640596B (en) | 2013-11-25 | 2013-11-25 | A kind of axle counting system and for the axis signal process of this axle counting system and axle counting method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004877A (en) * | 2015-07-15 | 2015-10-28 | 成都森川铁路车辆技术开发有限公司 | Wheel sensor signal processing method and wheel sensor signal processing system |
| CN110281977A (en) * | 2019-06-17 | 2019-09-27 | 深圳科安达电子科技股份有限公司 | A kind of axis-counting device |
| CN110281976A (en) * | 2019-06-17 | 2019-09-27 | 深圳科安达电子科技股份有限公司 | A kind of axle counting system |
| CN110293997A (en) * | 2019-06-17 | 2019-10-01 | 深圳科安达电子科技股份有限公司 | The jamproof whistle control system of tramcar and axis-counting device |
| CN110293996A (en) * | 2019-06-17 | 2019-10-01 | 深圳科安达电子科技股份有限公司 | A kind of anti-interference axle counting method of streetcar track |
| CN110304109A (en) * | 2019-06-17 | 2019-10-08 | 深圳科安达电子科技股份有限公司 | A kind of axle counting method that can prevent from losing axis |
| CN110304108A (en) * | 2019-06-17 | 2019-10-08 | 深圳科安达电子科技股份有限公司 | It can prevent from losing the axle counting system and axis-counting device of axis |
| CN110426217A (en) * | 2019-08-09 | 2019-11-08 | 哈尔滨市科佳通用机电股份有限公司 | A kind of fault handling method based on wheel sensor signal processing unit |
| CN110611539A (en) * | 2019-09-05 | 2019-12-24 | 深圳科安达电子科技股份有限公司 | Signal interference preventing railway inter-station information safety transmission system and method |
| WO2020252881A1 (en) * | 2019-06-17 | 2020-12-24 | 深圳科安达电子科技股份有限公司 | Axle counting system |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004877A (en) * | 2015-07-15 | 2015-10-28 | 成都森川铁路车辆技术开发有限公司 | Wheel sensor signal processing method and wheel sensor signal processing system |
| CN105004877B (en) * | 2015-07-15 | 2017-11-10 | 成都森川科技股份有限公司 | wheel sensor signal processing method and system |
| CN110304109A (en) * | 2019-06-17 | 2019-10-08 | 深圳科安达电子科技股份有限公司 | A kind of axle counting method that can prevent from losing axis |
| CN110281976A (en) * | 2019-06-17 | 2019-09-27 | 深圳科安达电子科技股份有限公司 | A kind of axle counting system |
| CN110293997A (en) * | 2019-06-17 | 2019-10-01 | 深圳科安达电子科技股份有限公司 | The jamproof whistle control system of tramcar and axis-counting device |
| CN110293996A (en) * | 2019-06-17 | 2019-10-01 | 深圳科安达电子科技股份有限公司 | A kind of anti-interference axle counting method of streetcar track |
| CN110281977A (en) * | 2019-06-17 | 2019-09-27 | 深圳科安达电子科技股份有限公司 | A kind of axis-counting device |
| CN110304108A (en) * | 2019-06-17 | 2019-10-08 | 深圳科安达电子科技股份有限公司 | It can prevent from losing the axle counting system and axis-counting device of axis |
| WO2020252881A1 (en) * | 2019-06-17 | 2020-12-24 | 深圳科安达电子科技股份有限公司 | Axle counting system |
| CN110304108B (en) * | 2019-06-17 | 2021-07-02 | 深圳科安达电子科技股份有限公司 | Axle counting system capable of preventing axle from being lost and axle counting equipment |
| CN110281976B (en) * | 2019-06-17 | 2021-08-24 | 深圳科安达电子科技股份有限公司 | Axle counting system |
| CN110281977B (en) * | 2019-06-17 | 2021-08-24 | 深圳科安达电子科技股份有限公司 | Axle counting equipment |
| CN110426217A (en) * | 2019-08-09 | 2019-11-08 | 哈尔滨市科佳通用机电股份有限公司 | A kind of fault handling method based on wheel sensor signal processing unit |
| CN110426217B (en) * | 2019-08-09 | 2020-09-11 | 哈尔滨市科佳通用机电股份有限公司 | Fault processing method based on wheel sensor signal processing device |
| CN110611539A (en) * | 2019-09-05 | 2019-12-24 | 深圳科安达电子科技股份有限公司 | Signal interference preventing railway inter-station information safety transmission system and method |
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