CN104360098A - Vehicle speed detecting method based on vehicle engine - Google Patents
Vehicle speed detecting method based on vehicle engine Download PDFInfo
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- CN104360098A CN104360098A CN201410677163.3A CN201410677163A CN104360098A CN 104360098 A CN104360098 A CN 104360098A CN 201410677163 A CN201410677163 A CN 201410677163A CN 104360098 A CN104360098 A CN 104360098A
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Abstract
The invention discloses a vehicle speed detecting method based on a vehicle engine. The method comprises the steps of arranging a gear on a rotary shaft of the engine, forming optical pulse signals after a continuous light source perpendicularly irradiates on a code disc of the gear, acquiring the formed optical pulse signals and converting the optical pulse signals into electric pulse output signals, and calculating the rotating speed of the engine according to the number of acquired electric pulse output signals in unit time and displaying the rotating speed of the vehicle engine in real time through a display unit. The method is simple and measurement precision is high.
Description
Technical field
The present invention relates to a kind of speed measuring device, particularly relate to a kind of method for detecting vehicle speed based on motor car engine, belong to velocity measuring field.
Background technology
At present, in China's transport process, ubiquity the phenomenon that overspeed of vehicle travels, this behavior is not only easy to be damaged driver, also can produce the pedestrian in roadside or other vehicles and threaten, the traffic hazard caused thus is of common occurrence, causes great harm to the security of the lives and property of society and people.How to detect that the travel speed of vehicle in transit has become vehicle supervision department's major issue urgently to be resolved hurrily accurately and efficiently.
Traditional method for detecting vehicle speed has radar velocity measurement, laser velocimeter, infraredly to test the speed, ultrasound wave tests the speed and Data mining etc.These methods in use have certain limitation, are mainly reflected in: one, and measuring accuracy is limited; Two, find that overspeed of vehicle can not provide the comprehensively transport information such as the car category of vehicles peccancy and the number-plate number when travelling, timely process cannot be made to vehicles peccancy; Three, equipment is fragile, and maintenance cost is high.Current Bus-Speed Monitoring is all add detecting unit near tire substantially, for detecting the parameters that tyre rotation produces, calculate the judgement speed of a motor vehicle by parameters, but testing result and velocity accuracy all needs to be further improved.
Electronic instrument is all the size being determined the speed of a motor vehicle by the frequency of detection speed of a motor vehicle sensor signal, the corresponding 60km/h of as corresponding in 1Hz 1km/h, 60Hz.The frequency of vehicle speed signal is generally determined by 3 parameters: diameter of tyres D (or girth), this parameter can by the linear velocity of tire and speed of a motor vehicle v (unit km/h), convert angular velocity omega 1 (unit rPm) to, formula is as follows: ω 1=v/60 π D, and different vehicle diameter of tyres is different; Ratio of gear n, the reduction gear ratio n of process between output shaft of gear-box to tire, this parameter can convert tire angular velocity ω 1 to gearbox output shaft angular velocity omega 2, and formula is as follows: ω 2=n ω 1, and different vehicle ratio of gear is different; Often turn umber of pulse m, sensor and gear case coordinate, gearbox output shaft often turns around, sensor produces m pulse signal, gearbox output shaft angular velocity omega 2 is converted to the pulse signal frequency P (unit: Hz) that instrument detects by this parameter, and formula is as follows: P=m ω 2/60=m n ω 1/60=mnv/ (3600 π D).
The usual measuring truck short-cut counting method according to the frequency values P detected, through formula: v=3600 π D P/ (mn) calculate speed of a motor vehicle numerical value.That is: v=kP, constant k=3600 π D/ (mn).This method has 2 restrictions when instrument Software for Design: requirement accurately can know these three data values of D, m, n, and the inaccurate Bus-Speed Monitoring that all can cause of any one parameter is forbidden, and during any one unknown parameters, design just cannot complete; During vehicle change, when in these three parameters, any one parameter changes, instrument software all will make corresponding modify, also namely wants mter model to change, just, with car load one_to_one corresponding, it is numerous that model increases the trouble brought to each process of operation such as production, management, sale.
Such as application number is a kind of method for detecting vehicle speed of " 201210342552.1 ", run with predetermined speed v by allowing car load, on car load detection line, speed of a motor vehicle test board can be carried out, the now signal frequency P that detects of instrument, obtain k=v/P afterwards as calculated, and by this value stored in instrument system, constant k when normally working as instrument, when instrument normally works, the speed of a motor vehicle is v=kP.The beneficial effect of the technical program is adopted to facilitate feasible, instrument software developer need not pay close attention to car load physical construction and correlation parameter, decrease the work of confiding a technological secret of both sides of supply and demand in product development process, shorten the construction cycle, be applicable to all vehicles that instrument physical dimension is identical.But need to be further improved in rate accuracy.
And for example application number is " 201310045928.7 " a kind of method for detecting vehicle speed based on enumerating exploration, by marking three lane lines on image, hand labeled is no less than three pairs of unique points, set up mapping table, delimit tracing area, build a width background image, the method then adopting present frame and background image to do difference carries out target identification, utilize ratio method to find unique point, finally recycling enumerates the method calculating speed of a motor vehicle of exploration.The method for detecting vehicle speed of this invention, can detect the speed of vehicle in transit in real time, accurately, coordinates other application of intelligent transportation system can obtain rapidly the comprehensive information of vehicles peccancy, not by environmental restraint.Be applicable to the monitoring to the speed of a motor vehicle in intelligent traffic administration system, reduce the generation of traffic hazard, have broad application prospects.Although this invention solves vehicle speed measurement, need to be further improved in rate accuracy.
Summary of the invention
Technical matters to be solved by this invention provides a kind of method for detecting vehicle speed based on motor car engine for the deficiency of background technology, and its method is simple, measuring accuracy is high, antijamming capability is strong and can the rotating speed of accurately measured automobiles engine.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
Based on a method for detecting vehicle speed for motor car engine, specifically comprise following steps:
Step one, the rotation axis of engine arranges a gear;
Step 2, adopts continuous print light source vertical irradiation to form light pulse signal to the code-disc of gear;
Step 3, the light pulse signal that acquisition step two is formed, and this light pulse signal is converted to electric pulse output signal;
Step 4, the number according to gathering in the electric pulse output signal unit interval calculates engine speed and then by the real-time display automobile engine speed of display unit.
As the further preferred version of a kind of method for detecting vehicle speed based on motor car engine of the present invention, in step 2, form light pulse signal by arranging a light source emitter and an optical receiver respectively in the code-disc both sides of gear and light pulse signal converted to electric pulse output signal.
As the further preferred version of a kind of method for detecting vehicle speed based on motor car engine of the present invention, in step 2, by arranging a light source emitter and respectively in step 4 kind in the code-disc both sides of gear, described display unit is charactron.
As the further preferred version of a kind of method for detecting vehicle speed based on motor car engine of the present invention, in step 2, be light emitting diode by arranging light source emitter described in a light source emitter and respectively in the code-disc both sides of gear.
As the further preferred version of a kind of method for detecting vehicle speed based on motor car engine of the present invention, in step 2, be phototriode by arranging optical receiver described in a light source emitter and respectively in the code-disc both sides of gear.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, method is simple, measuring accuracy is high;
2, antijamming capability is strong and can the rotating speed of accurately measured automobiles engine;
3, simplify hardware circuit, reduce cost of products, shorten the design cycle, improve reliability and the dirigibility of device.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, a kind of method for detecting vehicle speed based on motor car engine, specifically comprises following steps:
Step one, the rotation axis of engine arranges a gear;
Step 2, adopts continuous print light source vertical irradiation to form light pulse signal to the code-disc of gear;
Step 3, the light pulse signal that acquisition step two is formed, and this light pulse signal is converted to electric pulse output signal;
Step 4, the number according to gathering in the electric pulse output signal unit interval calculates engine speed and then by the real-time display automobile engine speed of display unit.
Wherein, in step 2, form light pulse signal by arranging a light source emitter and an optical receiver respectively in the code-disc both sides of gear and light pulse signal converted to electric pulse output signal, in step 2, by arranging a light source emitter and respectively in step 4 kind in the code-disc both sides of gear, described display unit is charactron, in step 2, be light emitting diode by arranging light source emitter described in a light source emitter and respectively in the code-disc both sides of gear, in step 2, be phototriode by arranging optical receiver described in a light source emitter and respectively in the code-disc both sides of gear.
The rotation axis of engine arranges a gear, in the code-disc both sides of gear, one light source emitter and an optical receiver are set respectively, the rotation driven gear synchronous axial system of engine, when the code-disc of gear rotates, due to the light that the gear on code-disc sends through light source emitter, light transmition can be hindered.So the resistance at receiving tube two ends can vary widely, like this, the voltage at sampling resistor two ends will vary widely in circuit.
Number in the pulse capture port processing potential pulse unit interval in purpose processor, motor speed will be obtained, thus the acquisition speed of a motor vehicle, 30 are had to export pulse if fruit is per minute, the output time of each pulse can be calculated, again according to code-disc number, rotating speed and the code-disc rotating speed of gear can be calculated.Now the light pulse of reception is changed into electric pulse and transfers to micro controller module through pulse amplifying circuit by optical receiver, and micro controller module calculates engine speed according to process.It is all by arranging speed pickup detection speed near tire that current most of car speed detects, but can not show a candle in degree of accuracy by Photoelectric Detection come accurate.
Photoelectric speed detects and first utilizes mechanical drive mode, the rotating speed of train wheel is changed into the change of luminous flux, by photo-electric conversion element, the change of luminous flux is converted to the change of electric flux again, namely light pulse is converted to electric impulse signal, by calculating rotating speed to electric pulse.Photo-electric conversion element principle of work, namely when certain material is penetrated in illumination, if incident photon energy is enough large, cause electronics to overflow material surface, or resistance changes, or produces the change of electromotive force.
Those skilled in the art of the present technique are understandable that, can realize the combination of the frame in each frame in these structural drawing and/or block diagram and/or flow graph and these structural drawing and/or block diagram and/or flow graph with computer program instructions.These computer program instructions can be supplied to the processor of multi-purpose computer, special purpose computer or other programmable data disposal routes to generate machine, thus be created the method for specifying in frame for realizing structural drawing and/or block diagram and/or flow graph or multiple frame by the instruction that the processor of computing machine or other programmable data disposal routes performs.
Those skilled in the art of the present technique are understandable that, the step in the various operations discussed in the present invention, method, flow process, measure, scheme can be replaced, change, combine or delete.Further, there is various operations, method, other steps in flow process, measure, the scheme discussed in the present invention also can be replaced, change, reset, decompose, combine or delete.Further, of the prior art have also can be replaced with the step in operation various disclosed in the present invention, method, flow process, measure, scheme, changed, reset, decomposed, combined or deleted.
To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And these belong to connotation of the present invention the apparent change of extending out or variation still belong to protection scope of the present invention.
Claims (5)
1. based on a method for detecting vehicle speed for motor car engine, it is characterized in that: specifically comprise following steps:
Step one, the rotation axis of engine arranges a gear;
Step 2, adopts continuous print light source vertical irradiation to form light pulse signal to the code-disc of gear;
Step 3, the light pulse signal that acquisition step two is formed, and this light pulse signal is converted to electric pulse output signal;
Step 4, the number according to gathering in the electric pulse output signal unit interval calculates engine speed and then by the real-time display automobile engine speed of display unit.
2. a kind of method for detecting vehicle speed based on motor car engine according to claim 1, it is characterized in that: in step 2, form light pulse signal by arranging a light source emitter and an optical receiver respectively in the code-disc both sides of gear and light pulse signal converted to electric pulse output signal.
3. a kind of method for detecting vehicle speed based on motor car engine according to claim 1, is characterized in that: in step 4 kind, and described display unit is charactron.
4. a kind of method for detecting vehicle speed based on motor car engine according to claim 2, is characterized in that: described light source emitter is light emitting diode.
5. a kind of method for detecting vehicle speed based on motor car engine according to claim 2, is characterized in that: described optical receiver is phototriode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410677163.3A CN104360098A (en) | 2014-11-21 | 2014-11-21 | Vehicle speed detecting method based on vehicle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410677163.3A CN104360098A (en) | 2014-11-21 | 2014-11-21 | Vehicle speed detecting method based on vehicle engine |
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| Publication Number | Publication Date |
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| CN104360098A true CN104360098A (en) | 2015-02-18 |
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| CN201410677163.3A Withdrawn CN104360098A (en) | 2014-11-21 | 2014-11-21 | Vehicle speed detecting method based on vehicle engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104965099A (en) * | 2015-06-30 | 2015-10-07 | 深圳乐行天下科技有限公司 | Velocity measurement method and device |
| CN105259364A (en) * | 2015-08-28 | 2016-01-20 | 无锡伊佩克科技有限公司 | Rotating speed detection and control method of automobile engine |
| CN111156908A (en) * | 2020-01-10 | 2020-05-15 | 江苏森蓝智能***有限公司 | Product specification and size identification mode |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3871215A (en) * | 1971-05-10 | 1975-03-18 | Massachusetts Inst Technology | Opto-electronic apparatus to generate a pulse-modulated signal indicative of the mechanical state of a system |
| CN87213074U (en) * | 1987-09-07 | 1988-06-15 | 张恩 | Speed sensor |
| CN1178908A (en) * | 1996-08-06 | 1998-04-15 | 李扬荣 | Speed odometer with synchronous digital speed display and analogue speed pointer |
| CN201007718Y (en) * | 2006-12-22 | 2008-01-16 | 宁波南车时代传感技术有限公司 | Locomotive axle terminal photoelectric rotary speed sensor |
| CN101629861A (en) * | 2008-07-14 | 2010-01-20 | 北京新宇航世纪科技有限公司 | Torque rotary speed sensor |
-
2014
- 2014-11-21 CN CN201410677163.3A patent/CN104360098A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3871215A (en) * | 1971-05-10 | 1975-03-18 | Massachusetts Inst Technology | Opto-electronic apparatus to generate a pulse-modulated signal indicative of the mechanical state of a system |
| CN87213074U (en) * | 1987-09-07 | 1988-06-15 | 张恩 | Speed sensor |
| CN1178908A (en) * | 1996-08-06 | 1998-04-15 | 李扬荣 | Speed odometer with synchronous digital speed display and analogue speed pointer |
| CN201007718Y (en) * | 2006-12-22 | 2008-01-16 | 宁波南车时代传感技术有限公司 | Locomotive axle terminal photoelectric rotary speed sensor |
| CN101629861A (en) * | 2008-07-14 | 2010-01-20 | 北京新宇航世纪科技有限公司 | Torque rotary speed sensor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104965099A (en) * | 2015-06-30 | 2015-10-07 | 深圳乐行天下科技有限公司 | Velocity measurement method and device |
| CN105259364A (en) * | 2015-08-28 | 2016-01-20 | 无锡伊佩克科技有限公司 | Rotating speed detection and control method of automobile engine |
| CN111156908A (en) * | 2020-01-10 | 2020-05-15 | 江苏森蓝智能***有限公司 | Product specification and size identification mode |
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Application publication date: 20150218 |