CN103675826A - Bus vision dead zone barrier detection device - Google Patents
Bus vision dead zone barrier detection device Download PDFInfo
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- CN103675826A CN103675826A CN201310687156.7A CN201310687156A CN103675826A CN 103675826 A CN103675826 A CN 103675826A CN 201310687156 A CN201310687156 A CN 201310687156A CN 103675826 A CN103675826 A CN 103675826A
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- triode
- motorbus
- ultrasonic sensor
- dead zone
- voltage comparator
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- 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
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
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- 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
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
- G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention belongs to the technical field of bus barrier detection, and discloses a bus vision dead zone barrier detection device. According to the bus vision dead zone barrier detection device, the front end and the rear end of a bus are respectively provided with at least one ultrasonic sensor, each ultrasonic sensor faces the outside of the body of the bus, a signal output end of each ultrasonic sensor is provided with a corresponding ultrasonic signal processing circuit, and each ultrasonic signal processing circuit comprises a voltage comparator, a triode and a sound warner. In each ultrasonic signal processing circuit, the same-phase input end of the voltage comparator is electrically connected with the signal output end of the corresponding ultrasonic sensor, and the output end of the voltage comparator is electrically connected with a base electrode of the triode. An emitting electrode of the triode of each ultrasonic signal processing circuit is grounded, and a collector electrode of the triode of each ultrasonic signal processing circuit is in series connection with the corresponding sound warner and then is electrically connected with a direct-current power supply.
Description
Technical field
The invention belongs to motorbus detection of obstacles technical field, particularly a kind of motorbus vision dead zone obstacle detector.
Background technology
At current motorbus, there is huge vehicle body, for example, common motorbus has 9 meters long, 2.5 meters high, air-conditioned coach has 11 meters long, 2.8 meters high, like this, can cause vision dead zone to driver, it is all vision dead zone with the place of interior (children to the not enough 1.3m of height) that a large amount of drivers react 1m before left side (when especially vehicle turns left), dead astern and the car of bus, these blind areas can cause driver not observe the situation of motorbus periphery, thereby cause the generation of accidents such as rolling pedestrian or electric motor car, bicycle.
The rearview mirror in motorbus the place ahead can help driver to see vehicle body both sides road conditions around, but rearview mirror be can't see the road conditions in rear view of vehicle and the place ahead.
Summary of the invention
The object of the invention is to propose a kind of motorbus vision dead zone obstacle detector.The situation that this motorbus vision dead zone obstacle detector can avoid near pedestrian motorbus or electric motor car, bicycle etc. to be rolled occurs.
For realizing above-mentioned technical purpose, the present invention adopts following technical scheme to be achieved.
A motorbus vision dead zone obstacle detector, respectively arranges at least one ultrasonic sensor in the front-end and back-end of described motorbus, and each ultrasonic sensor is towards motorbus vehicle body outside;
The signal output part of described each ultrasonic sensor is provided with a corresponding ultrasonic signal treatment circuit, described each ultrasonic signal treatment circuit comprises voltage comparator, triode and voice guard, in each ultrasonic signal treatment circuit, the in-phase input end of described voltage comparator is electrically connected to the signal output part of corresponding ultrasonic sensor, and the output terminal of described voltage comparator is electrically connected to the base stage of triode; The grounded emitter of described triode, the collector of described triode is electrically connected to direct supply after serial connection voice guard.
Feature of the present invention and further improvement are:
Described ultrasonic sensor is T/R-40 serial universal ultrasound wave transmitting/receiving sensor, and described voltage comparator is LT311 type voltage comparator.
Outer left side and outside right side at described motorbus respectively arrange at least one ultrasonic sensor.
Described a kind of motorbus vision dead zone obstacle detector, also comprises for the power module of direct supply is provided to each ultrasonic sensor, each ultrasonic signal treatment circuit.
Described voice guard is fixed on driver's operation bench.
Beneficial effect of the present invention is: motorbus of the present invention vision dead zone obstacle detector can detect all road conditions of vehicle periphery as far as possible all sidedly, and realizes in real time and detecting, and reduces better the generation of the accident that rolls.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of a kind of motorbus of the present invention vision dead zone obstacle detector;
Fig. 2 is the ultrasonic sensor transmitting terminal electrical block diagram of a kind of motorbus vision dead zone obstacle detector of the embodiment of the present invention;
Fig. 3 is the ultrasonic sensor receiving terminal circuit structural representation of a kind of motorbus vision dead zone obstacle detector of the embodiment of the present invention;
Fig. 4 is the ultrasonic signal treatment circuit schematic diagram of a kind of motorbus vision dead zone obstacle detector of the embodiment of the present invention;
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
With reference to Fig. 1, it is the electrical block diagram of a kind of motorbus of the present invention vision dead zone obstacle detector.Front end, rear end, outer left side and outside right side at motorbus respectively arrange at least one ultrasonic sensor, and ultrasonic sensor is for detecting obstacles thing.The number of the ultrasonic sensor arranging can arrange according to the body dimensions of motorbus, for example, at the front end of motorbus, is fixed with the first ultrasonic sensor, in the rear end of motorbus, is fixed with the second ultrasonic sensor; Wherein, the first ultrasonic sensor is positioned on the longitudinal centre line of front end face of motorbus, and its height is overhead between 1 meter to 1.5 meters; The second ultrasonic sensor is positioned on the longitudinal centre line of motorbus rear end face, and its height is overhead between 1 meter to 1.5 meters.Outer left side and outside right side at motorbus are respectively provided with 3 ultrasonic sensors, wherein, be positioned at 3 ultrasonic sensors of outer left side of motorbus in same level height (height is overhead between 1 meter to 1.5 meters), and be laterally evenly arranged on the outer left side of motorbus; Be positioned at 3 ultrasonic sensors on outside right side of motorbus in same level height (height is overhead between 1 meter to 1.5 meters), and be laterally evenly arranged on the outside right side of motorbus.Each ultrasound wave comprises a transmitting terminal (for outwards launching ultrasound wave), a receiving end (for receiving the ultrasound wave reflecting).In the embodiment of the present invention, the receiving end of each ultrasonic sensor and transmitting terminal are towards motorbus vehicle body outside.
In the embodiment of the present invention, each ultrasonic sensor adopts T/R-40 serial universal ultrasound wave transmitting/receiving sensor, and it is comprised of transmitting terminal (or claiming ripple transmitter), receiving end (or claiming ripple receiver) and control section.If the piezoelectric ceramic piece that is 40KHz to transmitting terminal interior resonance frequency (twin crystal oscillator) applies 40KHz HF voltage, piezoelectric ceramic piece just extends according to added high frequency polarity of voltage and shortens, so send the ultrasound wave of 40KHz frequency, its ultrasound wave is propagated (density degree can be modulated by control circuit) with density form, returns to receiving end after running into barrier.Receiving end is the principle of utilizing the piezoelectric effect that pressure transducer adopts, on piezoelectric element, exerts pressure, and makes piezoelectric element generation strain, and producing one side is "+" utmost point, and another side is the 40KHz sinusoidal signal of "-" utmost point.This sinusoidal signal, through amplifying after processing, is outwards exported through the signal output part of ultrasonic sensor.
In conjunction with Fig. 1, signal output part at each ultrasonic sensor is provided with a corresponding ultrasonic signal treatment circuit, each ultrasonic signal treatment circuit comprises voltage comparator, triode and voice guard, in each ultrasonic signal treatment circuit, the signal output part that the in-phase input end of voltage comparator is electrically connected to corresponding ultrasonic sensor (refers to ultrasound wave, the inverting input of voltage comparator is used for accessing reference voltage signal, and the output terminal of voltage comparator is electrically connected to the base stage of triode.The amplitude of reference voltage signal is setting value, and for example, for when barrier is positioned at front 1 meter of of ultrasonic sensor, ultrasonic sensor signal output part is the magnitude of voltage of the sinusoidal signal of output outwards.In the embodiment of the present invention, voltage comparator adopts LT311 type voltage comparator, this voltage comparator is for the magnitude of voltage of the voltage magnitude of comparison reference voltage signal and the sinusoidal signal of ultrasonic sensor signal output part output, and for according to comparative result, outwards export corresponding low and high level signal.When the input voltage of the in-phase input end of voltage comparator is greater than the input voltage of inverting input, the output terminal of voltage comparator output high level signal; Otherwise,, the output terminal output low level signal of voltage comparator.
The aerial velocity of propagation of ultrasound wave is v, and according to transmitting ultrasound wave and the hyperacoustic mistiming △ t of reception, just can calculate launching site apart from the distance S of barrier, that is: S=v △ t/2, known according to analyzing: mistiming △ t and S in above formula are closely related, sound wave amplitude can reduce along with the increase of S simultaneously, energy reduces thereupon, because ultrasonic sensor can utilize piezoelectric effect, the mechanical vibration that act on above it are converted to corresponding electric signal again, play the effect of energy conversion, when v and S mono-timing, ultrasonic sensor can be exported the voltage signal of amplitude and specific, the amplitude of this voltage signal is exactly the amplitude (S is 1 meter) of voltage comparator inverting input reference voltage.Reference voltage signal can directly generate through divider resistance dividing potential drop.In addition, according to above-mentioned principle, when barrier is less than 1 meter to the distance of ultrasonic sensor, the amplitude of the output voltage of ultrasonic sensor signal output part is greater than the amplitude of reference voltage, the output terminal output high level signal of voltage comparator; Otherwise, the output terminal output low level signal of voltage comparator.
In conjunction with Fig. 1, the grounded emitter of triode, the collector of triode is electrically connected to direct supply after serial connection voice guard.Triode is NPN triode.Triode plays the effect of a switch, and when the signal of voltage comparator output is low level signal, base current is 0, and transistor collector electric current is 0, and now, triode is in cut-off state, and voice guard is not worked; When the signal of voltage comparator output is high level signal, base current is larger, to such an extent as to triode is saturated, and at this moment, voice guard is switched on, the alarm signal of can sounding.Voice guard is positioned on driver's operation bench and (is for example positioned on panel board), is convenient to driver and hears audible alarm, and in the embodiment of the present invention, audible alarm adopts voice alarm device.
In the embodiment of the present invention, for example also comprise, for the power module (using car battery) of direct supply is provided to each ultrasonic sensor, each ultrasonic signal treatment circuit.Power end at ultrasonic sensor transmitting terminal is provided with hand push button, and this hand push button is positioned on pilothouse operation bench and (is for example positioned on panel board).Like this, driver can judge whether to open this motorbus vision dead zone obstacle detector (realizing by pressing hand push button) according to road conditions.
A specific embodiment of the present invention below:
With reference to Fig. 2, it is the ultrasonic sensor transmitting terminal electrical block diagram of a kind of motorbus vision dead zone obstacle detector of the embodiment of the present invention.In this ultrasonic sensor transmitting terminal circuit, the positive pole of direct supply U is in parallel with the first capacitor C 1 after serial connection hand push button S, the positive pole of direct supply U is electrically connected to the common node of one end of the first divider resistance R1 and one end of the second divider resistance R2 after serial connection hand push button S, the negative electricity of direct supply U connects the emitter of the first triode VT1, the common node of the anode of the emitter of the second triode VT2 and the first voltage stabilizing diode VD1, one end of T-40-16 ultrasonic transducer is electrically connected to the common node of the negative electrode of the first voltage stabilizing diode VD1 and the base stage of the first triode VT1, the other end of T-40-16 ultrasonic transducer is electrically connected to the other end of the second divider resistance R2, and the common node of the collector of the second triode VT2, the collector of the first triode VT1 is electrically connected to the other end of the first divider resistance R1, and the common node of the base stage of the second triode VT2.The first triode VT1 and the second triode VT2 are 9013 type triodes, and the model of the first voltage stabilizing diode VD1 is 1N4148.The first triode VT1 and the second triode VT2 form strong feedback resonator oscillator, and oscillation frequency equals the resonant frequency of T-40-16 ultrasonic transducer.T-40-16 ultrasonic transducer is feedback coupling element, is again output transducer for circuit.The waveform at T-40-16 ultrasonic transducer two ends is similar to square wave, and voltage amplitude approaches supply voltage.In the first triode VT1 base stage, reversal connection the first voltage stabilizing diode VD1 can stablize base voltage to ground.The maximum current that the first triode VT1 collector can reach is U
0/ R
1, the maximum current that the second triode VT2 collector can reach is U
0/ R
2, U
0for the magnitude of voltage of direct supply U, R
1be the resistance value of the first divider resistance R1, R
2it is the resistance value of the second divider resistance R2.
Circuit switches on power after (being that hand push button S is closed), by the first divider resistance R1 and the second divider resistance R2, provides base bias current to the second triode VT2 and the first triode VT1 simultaneously, makes two triodes enter magnifying state.The first triode VT1 first works, the collector of the first triode VT1 amplifies electric current, this small amplification will be amplified and feed back to the base stage of the first triode VT1 by the second triode VT2, again through the amplification of the first triode VT1, form chain reaction, make rapidly the first triode VT1 collector current reach maximum current U
0/ R
1thereby, make the first triode VT1 enter state of saturation, now the first triode VT1 is equivalent to the switch of a connection.Now, the second triode VT2 collector current becomes 0, in cut-off state, the second triode VT2 is equivalent to the switch disconnecting, and the first capacitor C 1 is discharged by the second triode VT2, electric discharge along with the first capacitor C 1, owing to there being the effect of power supply U, the base voltage of the second triode VT2 raises gradually and starts conducting and enters amplification region, in circuit, can occur at once chain reaction again, the second triode VT2 is saturated rapidly, the first triode VT1 cut-off.This time, capacitor C 1 was charged by the first triode VT1.This charge and discharge process can make again the first triode VT1 again saturated, the second triode VT2 cut-off.So go round and begin again, form oscillator signal, this oscillator signal produces the ultrasound wave of 40KHZ by sonac piezoelectric effect.
With reference to Fig. 3, it is the ultrasonic sensor receiving terminal circuit structural representation of a kind of motorbus vision dead zone obstacle detector of the embodiment of the present invention.In this ultrasonic sensor receiving terminal circuit, direct supply U is electrically connected to one end of the 5th resistance R 5, one end of the 6th resistance R 6, and the common node of one end of the 3rd capacitor C 3, the earth potential of GND is electrically connected to the emitter of the 4th triode VT4, the anode of the second voltage stabilizing diode VD2, the common node of one end of the emitter of the 3rd triode VT3 and R-40-16 piezoelectric element, the other end of R-40-16 piezoelectric element is electrically connected to the base stage of the 3rd triode VT3, the common node of one end of the 3rd resistance R 3, the collector of the 3rd triode VT3 is electrically connected to the other end of the 3rd resistance R 3, the other end of the 5th resistance R 5, and the common node of one end of the second capacitor C 2, the other end of the second capacitor C 2 is electrically connected to the negative electrode of the second voltage stabilizing diode VD2, the base stage of the 4th triode VT4, and the common node of one end of the 4th resistance R 4, the other end of the 4th resistance R 4, the collector of four triode VT4, and the common node of the other end of the 6th resistance R 6 is electrically connected to signal output part U2.The 3rd triode VT3 and the 4th triode VT4 are 9018 type triodes, and the model of the second voltage stabilizing diode VD2 is 1N4148.
R-40-16 piezoelectric element adopts the principle of piezoelectric effect, when ultrasound wave, on this piezoelectric element, exerts pressure, and makes this piezoelectric element generation strain, produces sine voltage signal.The voltage signal now producing is fainter, so be provided with the 3rd triode VT3 and the 4th triode VT4 in circuit, by the voltage signal to faint, carries out two-stage amplification and modulation, by signal output part U2 output voltage signal.
R-40-16 piezoelectric element is connected between the base stage and emitter of the 3rd triode VT3, the faint voltage signal being received carries out one-level amplification by the 3rd triode VT3, the collector of the 3rd triode VT3 is connected with the base stage of the 4th triode VT4 by the second capacitor C 2 again, the 4th triode VT4 carries out secondary amplification by voltage signal again, form final output voltage, wherein the second capacitor C 2 plays the effect of filtered noise, modulation signal in circuit.The 3rd resistance R 3 and the 4th resistance R 4 are respectively the 3rd triode VT3 and the 4th triode VT4 provides base current.The second voltage stabilizing diode VD2 of reversal connection between the 4th triode VT4 base stage and emitter can stablize the base voltage of the 4th triode VT4, stablizes quiescent point.The effect that can play protection direct supply of the 3rd capacitor C 3.
With reference to Fig. 4, it is the ultrasonic signal treatment circuit schematic diagram of a kind of motorbus vision dead zone obstacle detector of the embodiment of the present invention.The signal output part U2 of ultrasonic sensor is electrically connected to the in-phase input end of voltage comparator M, the inverting input of voltage comparator M is electrically connected to one end of the 7th resistance R 7, and the common node of one end of the 8th resistance R 8, the output terminal of voltage comparator M is electrically connected to the negative electrode of the 3rd voltage stabilizing diode VD3, one end of the 9th resistance R 9, and the common node of the base stage of the 5th triode VT5, the negative power end of voltage comparator M, the other end of the 8th resistance R 8, the anode of the 3rd voltage stabilizing diode VD3, and the common node ground connection of the emitter of the 5th triode VT5, the positive power source terminal of voltage comparator M, the other end of the 7th resistance R 7, and the common node of the other end of the 9th resistance R 9 is electrically connected to direct supply U, the collector of the 5th triode VT5 is electrically connected to direct supply U after serial connection phonetic alarm T.
The input voltage of the inverting input of voltage comparator M is reference voltage, this reference voltage level is determined by a minute compression functions for the 7th resistance R 7 and the 8th resistance R 8, select the 7th resistance R 7 and the 8th resistance R 8 of suitable resistance, both can obtain the reference voltage signal of amplitude and specific.The 9th resistance R 9 is the base resistance of the 5th triode VT5, and for the 5th triode VT5 provides base current, the 3rd voltage stabilizing diode VD3 plays the effect of stablizing base voltage.If the input voltage of the in-phase input end of voltage comparator M is U
2, the input voltage of the inverting input of voltage comparator M is U
1, work as U
2>U
1time, voltage comparator M exports high level signal, and now the 5th triode VT5 conducting, is equivalent to closed switch, and phonetic alarm is given the alarm; Work as U
2<U
1time, end of oppisite phase voltage is during higher than in-phase end, voltage comparator M output low level signal, and now the 5th not conducting of triode VT5, phonetic alarm is not worked.
When driver feels traffic conditions more complicated around of motorbus or is difficult to predicting road conditions, driver can press hand push button S, make hand push button S closed, make motorbus of the present invention vision dead zone obstacle detector in running order, thereby can detect the road conditions of vision dead zone.
Motorbus of the present invention vision dead zone obstacle detector can detect all road conditions of vehicle periphery as far as possible all sidedly, and realizes in real time and detecting, and reduces better the generation of the accident that rolls.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (5)
1. a motorbus vision dead zone obstacle detector, is characterized in that, in the front-end and back-end of described motorbus, at least one ultrasonic sensor is respectively set, and each ultrasonic sensor is towards motorbus vehicle body outside;
The signal output part of described each ultrasonic sensor is provided with a corresponding ultrasonic signal treatment circuit, described each ultrasonic signal treatment circuit comprises voltage comparator, triode and voice guard, in each ultrasonic signal treatment circuit, the in-phase input end of described voltage comparator is electrically connected to the signal output part of corresponding ultrasonic sensor, and the output terminal of described voltage comparator is electrically connected to the base stage of triode; The grounded emitter of described triode, the collector of described triode is electrically connected to direct supply after serial connection voice guard.
2. a kind of motorbus as claimed in claim 1 vision dead zone obstacle detector, is characterized in that, described ultrasonic sensor is T/R-40 serial universal ultrasound wave transmitting/receiving sensor, and described voltage comparator is LT311 type voltage comparator.
3. a kind of motorbus as claimed in claim 1 vision dead zone obstacle detector, is characterized in that, on outer left side and the outside right side of described motorbus, at least one ultrasonic sensor is respectively set.
4. a kind of motorbus as claimed in claim 1 vision dead zone obstacle detector, is characterized in that, also comprises for the power module of direct supply is provided to each ultrasonic sensor, each ultrasonic signal treatment circuit.
5. a kind of motorbus as claimed in claim 1 vision dead zone obstacle detector, is characterized in that, described voice guard is fixed on driver's operation bench.
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|---|---|---|---|
| CN201310687156.7A CN103675826A (en) | 2013-12-13 | 2013-12-13 | Bus vision dead zone barrier detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310687156.7A CN103675826A (en) | 2013-12-13 | 2013-12-13 | Bus vision dead zone barrier detection device |
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| CN103675826A true CN103675826A (en) | 2014-03-26 |
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| CN201310687156.7A Pending CN103675826A (en) | 2013-12-13 | 2013-12-13 | Bus vision dead zone barrier detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106205215A (en) * | 2016-08-30 | 2016-12-07 | 李�诚 | Bridge pier security protection region intelligent detecting boats and ships sail warning system into |
| CN108845327A (en) * | 2018-08-13 | 2018-11-20 | 河南城建学院 | A kind of intelligent measurement and system for prompting of truck blind area barrier |
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| CN108845327A (en) * | 2018-08-13 | 2018-11-20 | 河南城建学院 | A kind of intelligent measurement and system for prompting of truck blind area barrier |
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Application publication date: 20140326 |