CN104590223A - Automobile collision avoidance control method based on infrared ray pulse counting - Google Patents
Automobile collision avoidance control method based on infrared ray pulse counting Download PDFInfo
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- CN104590223A CN104590223A CN201410668011.7A CN201410668011A CN104590223A CN 104590223 A CN104590223 A CN 104590223A CN 201410668011 A CN201410668011 A CN 201410668011A CN 104590223 A CN104590223 A CN 104590223A
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- Prior art keywords
- infrared
- distance
- circuit
- control method
- infrared ray
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q9/00—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling
- B60Q9/008—Arrangement or adaptation of signal devices not provided for in one of main groups B60Q1/00 - B60Q7/00, e.g. haptic signalling for anti-collision purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/93—Lidar systems specially adapted for specific applications for anti-collision purposes
Abstract
The invention discloses an automobile collision avoidance control method based on infrared ray pulse counting. The method comprises the steps that the parameter of the distance away from a barrier is pre-determined, the number of pulses between the infrared ray emission by an infrared ray emitting circuit and the infrared ray reception by an infrared ray receiving circuit on the first-time reflection of a barrier is counted; the distance away from the barrier is calculated according to t=n*T and s=c*t/2; a comparison is conducted between the distance away from the barrier and the pre-determined safety distance threshold parameter; alarm raising is conducted by an alarm control unit if the distance away from the barrier is less than the safety distance threshold parameter; comparisons are continuously conducted between the distance away from the barrier and the pre-determined dangerous distance threshold parameter, and a brake reduction gear is driven if the distance away from the barrier is less than the dangerous distance parameter. The automobile collision avoidance control method based on the infrared ray pulse counting is high in precision and car accidents can be avoided effectively.
Description
Technical field
The present invention relates to a kind of infrared distance measuring method, particularly relate to a kind of automobile collision preventing control method based on infrared pulse counting, belong to electronic technology field.
Background technology
Along with expanding economy, transportation is become increasingly prosperous, but is difficult to catch up with due to the hardware such as road condition, transport administration, add drive overtake other vehicles, principle that to go out that car is deserted, mistake estimates spacing etc. subjective, the traffic accident of collision is mutually occurred again and again.The essential measure addressed this problem is to install and can find range from motion tracking to the automobile in advancing, self-stopping device in danger range.
Due to the development of Eltec, laser ranging, microwave radar range, ultrasonic ranging and infrared distance measuring are successively there is.Wherein laser ranging is detecting laser beam two spacing reflected by the catadioptre of laser beam irradiation on front truck (automobile tail).Due to the vibration by atrocious weather, automobile fierceness, the factors such as mirror surface is worn and torn, pollution impact, make the laser beam of reflection detection range on certain power reduce 1/2 ~ 1/3 than the ultimate range that may detect, loss is very large, the accuracy rate of impact detection; Microwave radar range technology be military and the circuit part such as the equipment that adopts of some commercial development and oscillator expensive, almost also do not open up now commercial market; Research was done in ultrasonic ranging at home and abroad existing people, owing to adopting special professional component to make its price high, was difficult to promote; Infrared ray, as a kind of special light wave, has the basic physical transfer characteristic-reflection, refraction, scattering etc. of light wave, and due to its technical risk relatively not too large, the ranging system of formation is with low cost, function admirable, is convenient to civilian popularization.
The means of current automobile collision preventing also mainly concentrate on the safety air bag and safety strap etc. of vehicle frame and the car body, more reasonable mechanical that can absorb Impact energy as much as possible.These passive protection means can protect the safety of occupant when having an accident, thus reduce the death toll of traffic accident.But what finally will solve is the way can saved more life, more the wounded and save more money, and first-selection is equipment automobile anti-collision alarm system.Automobile anti-collision alarm system mainly can be realized by following several technology: 1) super sonic, because square being directly proportional of ultrasonic energy and distance is decayed, therefore distance is far away, the super sonic be reflected back is fewer, sensitivity declines, its ranging coverage can only reach several meters to tens meters, is generally used as Reverse Sensor.This sensor can not determine the distance of object very accurately, and it is mainly used in warning, as the pedestrian on detection track.3) video imaging, due to its high cost, uses so also limit it.4) microwave, microwave is easily by external electromagnetic wave excitation.Several technology has corresponding limitation above.
Such as application number is a kind of automobile anti-collision alarm system based on pulsed laser ranging of " 201110450567.5 ", belong to electronic technology field, the present invention is by arranging with micro controller system STC12C5A60S2 be core control circuit and laser transmission circuit, laser pick-off amplifying circuit and interlock circuit, under the support of corresponding program, laser pulse signal is after beam splitter light splitting, one tunnel is reflective through light deflector, directly received by PIN acceptor circuit, another road pulse laser is reflected by front vehicles, then received by APD laser pick-off circuit, two-way pulse laser gives the process of micro controller system governor circuit all respectively after moment discrimination circuit accurate correction its time of reception, the distance of real-time this car of monitoring and front truck, and can when danger, system sends sound and light alarm, the chaufeur of voice message simultaneously notes the speed of a motor vehicle, keep the distance with front truck, where necessary, system exports speed-slackening signal and controls automobile brake, this invention needs further to be improved in survey precision.
And for example application number is a kind of automobile anti-collision alarm system based on ultrasonic ranging of " 201210178595.0 ".It comprises AT89C2051 control module, ultrasonic distance measuring module, alarm module, display module and power module.AT89C2051 control module is transferred to when the distance detected is converted into level signal by ultrasonic distance measuring module, the signal received carries out processing and compares with the maximum range value of setting by AT89C2051 control module, if this distance is less than the maximum range value of setting, AT89C2051 control module will send instruction to alarm module, make alarm sounds remind driver, distance value is shown by display module simultaneously.This invention meets the requirement of generally closely finding range, but the higher and survey precision of cost needs to be further improved.
Summary of the invention
Technical matters to be solved by this invention provides a kind of automobile collision preventing control method based on infrared pulse counting for the deficiency of background technology, and its method is simple and can be efficiently avoid the generation of traffic accident by accurate Calculation spacing.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
Based on an automobile collision preventing control method for infrared pulse counting, specifically comprise following steps:
Step 1, the distance parameter of predeterminable range obstacle, comprises danger range and safety distance threshold parameter; Infrared transmitting circuit and infrared receiving circuit is provided with at body forward structure;
Step 2, adopts infrared transmitting circuit transmitting infrared ray to send actuation signal simultaneously and starts step-by-step counting; When infrared radiation receiving circuit first time receives the infrared ray of obstacle reflection, send danger signal stop pulse counting;
Step 3, statistics infrared transmitting circuit transmitting infrared ray receives the pulse number between the infrared ray of obstacle reflection to infrared radiation receiving circuit first time;
Step 4, according to the pulse number that step 3 counts, is multiplied by pulse number n by the cycle T of pulse and namely draws the time difference t of transmitting infrared ray to receiving infrared-ray, i.e. t=nT; Namely the distance of distance obstacle is drawn, i.e. s=ct/2 by the half that light velocity c is multiplied by time difference t;
Step 5, distance and the preset security distance threshold parameters of the distance obstacle calculated according to step 4 contrast; If lower than safety distance threshold parameter, then control alarm unit and give the alarm; The distance of distance obstacle and default danger range threshold parameter is continued to contrast, if lower than danger range parameter, then driving brake speed reduction gearing.
As the further preferred version of a kind of automobile collision preventing control method based on infrared pulse counting of the present invention, described danger range threshold parameter is 20m.
As the further preferred version of a kind of automobile collision preventing control method based on infrared pulse counting of the present invention, described safety distance threshold parameter is 30m.
As a kind of further preferred version of automobile collision preventing control method based on infrared pulse counting of the present invention, described infrared transmitting circuit comprises the oscillator, the constant current that connect successively and launches and send out a road, the first instruction issue circuit and transmitting probe.
As the further preferred version of a kind of automobile collision preventing control method based on infrared pulse counting of the present invention, described infrared radiation receiving circuit comprises the infrared receiving terminal, amplifying circuit, shaping circuit, the second instruction issue circuit that connect successively.
As the further preferred version of a kind of automobile collision preventing control method based on infrared pulse counting of the present invention, in steps of 5, described display unit is LCD display.
As the further preferred version of a kind of automobile collision preventing control method based on infrared pulse counting of the present invention, described alarm unit is acousto-optic warning unit.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, the inventive method simple, be easy to realize and survey precision is high;
2, the present invention adopts " counting " mode, by calculating the pulse number between the count enable signal receiving infrared remote receiver transmission and count stop signal, the large increase that made accuracy of measurement have;
3, the present invention can remind motorist in time by accurate Calculation spacing, efficiently avoid the generation of traffic accident.
Detailed description of the invention
Below technical scheme of the present invention is described in further detail:
Based on an automobile collision preventing control method for infrared pulse counting, specifically comprise following steps:
Step 1, the distance parameter of predeterminable range obstacle, comprises danger range and safety distance threshold parameter; Infrared transmitting circuit and infrared receiving circuit is provided with at body forward structure;
Step 2, adopts infrared transmitting circuit transmitting infrared ray to send actuation signal simultaneously and starts step-by-step counting; When infrared radiation receiving circuit first time receives the infrared ray of obstacle reflection, send danger signal stop pulse counting;
Step 3, statistics infrared transmitting circuit transmitting infrared ray receives the pulse number between the infrared ray of obstacle reflection to infrared radiation receiving circuit first time;
Step 4, according to the pulse number that step 3 counts, is multiplied by pulse number n by the cycle T of pulse and namely draws the time difference t of transmitting infrared ray to receiving infrared-ray, i.e. t=nT; Namely the distance of distance obstacle is drawn, i.e. s=ct/2 by the half that light velocity c is multiplied by time difference t;
Step 5, distance and the preset security distance threshold parameters of the distance obstacle calculated according to step 4 contrast; If lower than safety distance threshold parameter, then control alarm unit and give the alarm; The distance of distance obstacle and default danger range threshold parameter is continued to contrast, if lower than danger range parameter, then driving brake speed reduction gearing.
Wherein, described critical distance threshold parameter is 20m, described normal distance threshold parameters is 30m, described infrared transmitting circuit comprises oscillator, road, the first instruction issue circuit and transmitting probe are launched in constant current, described infrared radiation receiving circuit comprises infrared receiving terminal, amplifying circuit, shaping circuit, the second instruction issue circuit, described display unit is LCD display, and described alarm unit is acousto-optic warning unit.
Infrared receiver: by 40kHz oscillator, the composition such as road and transmitting probe is launched in constant current, oscillator produces the very little burst pulse of dutycycle, constant current source is adopted to provide the electric current of about 20mA, which reduce power consumption, improve emissive power, last infrared ray is focused on by transmitting probe, is less than 2 ° of transmittings with angle of scattering.
Infrared receiver: be made up of infrared receiving terminal, the 1st grade of circuit such as amplifying circuit, the 2nd grade of amplifying circuit, shaping, AGC ride gain, amplify with the 2nd grade of amplifying circuit through the 1st grade after infrared receiving terminal Received signal strength, by Schmitt trigger circuit shaping, send into micro controller system process.Wherein AGC controls the gain of acceptor circuit, ensures that permanent width exports.
Micro controller system: be made up of clock oscillator and micro controller module, through programming, chip microcontroller Auto-counting, computing time t and measuring distance s, and measuring distance is exported to read out instrument continuously, produces alerting signal simultaneously when vehicle headway is 30m and produce self-actuating brake restriction signal simultaneously.
Display unit: be made up of decoding scheme, telltale, the range signal that micro controller system exports, through decoder for decoding, is shown by telltale, the distance of dynamic display car and obstacle.
Alarm unit: be made up of binary pair, driving circuit and toy trumpet.When following distance is 30m, micro controller system is to binary pair signal, makes binary pair set produce a set of pulses, by driving circuit, makes toy trumpet send chimes of doom, and when being greater than 30m, trigger reset, stops producing pulse.
Brake deceleration unit: be made up of K switch and self-actuating brake speed reduction gearing, when driver thinks that necessity uses self-actuating brake speed reduction gearing, close switch K.When following distance is less than 20m, micro controller system provides a signal, starts self-actuating brake speed reduction gearing, prevents collision.
Current ranging system range finding groundwork used is all be based upon on the basis of Measuring Time difference, and the method for Measuring Time mainly contains " pulse mode " and " frequency modulation 2 continuous wave mode ".These two kinds of metering systems are all realize with analogous circuit, due to the impact of device time delay, survey precision are declined greatly.The present invention adopts " counting " mode, by micro controller system process, and accuracy of measurement is had large increase.
Those skilled in the art of the present technique are understandable that, can realize the combination of the frame in each frame in these constructionals drawing and/or block diagram and/or flow graph and these constructionals drawing and/or block diagram and/or flow graph with computer program instructions.These computer program instructions can be supplied to the treater of general computer, special purpose computer or other programmable data processing methods to generate machine, thus create the method for specifying in the frame of implementation structure figure and/or block diagram and/or flow graph or multiple frame by the instruction that the treater of computing machine or other programmable data processing methods performs.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.Embodiments of the present invention are explained in detail, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, make a variety of changes under can also or else departing from the prerequisite of present inventive concept.
Claims (7)
1., based on an automobile collision preventing control method for infrared pulse counting, it is characterized in that: specifically comprise following steps:
Step 1, the distance parameter of predeterminable range obstacle, comprises danger range and safety distance threshold parameter; Infrared transmitting circuit and infrared receiving circuit is provided with at body forward structure;
Step 2, adopts infrared transmitting circuit transmitting infrared ray to send actuation signal simultaneously and starts step-by-step counting; When infrared radiation receiving circuit first time receives the infrared ray of obstacle reflection, send danger signal stop pulse counting;
Step 3, statistics infrared transmitting circuit transmitting infrared ray receives the pulse number between the infrared ray of obstacle reflection to infrared radiation receiving circuit first time;
Step 4, according to the pulse number that step 3 counts, is multiplied by pulse number n by the cycle T of pulse and namely draws the time difference t of transmitting infrared ray to receiving infrared-ray, i.e. t=nT; Namely the distance of distance obstacle is drawn, i.e. s=ct/2 by the half that light velocity c is multiplied by time difference t;
Step 5, distance and the preset security distance threshold parameters of the distance obstacle calculated according to step 4 contrast; If lower than safety distance threshold parameter, then control alarm unit and give the alarm; The distance of distance obstacle and default danger range threshold parameter is continued to contrast, if lower than danger range parameter, then driving brake speed reduction gearing.
2. a kind of automobile collision preventing control method based on infrared pulse counting according to claim 1, is characterized in that: described danger range threshold parameter is 20m.
3. a kind of automobile collision preventing control method based on infrared pulse counting according to claim 1, is characterized in that: described safety distance threshold parameter is 30m.
4. according to claim 1 a kind of based on infrared pulse counting automobile collision preventing control method, it is characterized in that: described infrared transmitting circuit comprise connect successively oscillator, constant current launch send out a road, the first instruction issue circuit and transmitting probe.
5. a kind of automobile collision preventing control method based on infrared pulse counting according to claim 1, is characterized in that: described infrared radiation receiving circuit comprises the infrared receiving terminal, amplifying circuit, shaping circuit, the second instruction issue circuit that connect successively.
6. a kind of automobile collision preventing control method based on infrared pulse counting according to claim 1, it is characterized in that: in steps of 5, described display unit is LCD display.
7. a kind of automobile collision preventing control method based on infrared pulse counting according to claim 1, is characterized in that: described alarm unit is acousto-optic warning unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410668011.7A CN104590223A (en) | 2014-11-21 | 2014-11-21 | Automobile collision avoidance control method based on infrared ray pulse counting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410668011.7A CN104590223A (en) | 2014-11-21 | 2014-11-21 | Automobile collision avoidance control method based on infrared ray pulse counting |
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| CN104590223A true CN104590223A (en) | 2015-05-06 |
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| CN201410668011.7A Withdrawn CN104590223A (en) | 2014-11-21 | 2014-11-21 | Automobile collision avoidance control method based on infrared ray pulse counting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267750A (en) * | 2016-12-30 | 2018-07-10 | 深圳天珑无线科技有限公司 | The method and system of infrared thread environment detecting |
| RU2713646C1 (en) * | 2016-10-28 | 2020-02-06 | Ппг Индастриз Огайо, Инк. | Coatings to increase detection distance to object detected by means of electromagnetic radiation of near infrared range |
| CN111230324A (en) * | 2019-11-15 | 2020-06-05 | 济南邦德激光股份有限公司 | Anti-collision control method and anti-collision control device for laser cutting head |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2713646C1 (en) * | 2016-10-28 | 2020-02-06 | Ппг Индастриз Огайо, Инк. | Coatings to increase detection distance to object detected by means of electromagnetic radiation of near infrared range |
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Application publication date: 20150506 |