CN202711492U - Ultrasonic stall information acquirer - Google Patents
Ultrasonic stall information acquirer Download PDFInfo
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- CN202711492U CN202711492U CN 201220401381 CN201220401381U CN202711492U CN 202711492 U CN202711492 U CN 202711492U CN 201220401381 CN201220401381 CN 201220401381 CN 201220401381 U CN201220401381 U CN 201220401381U CN 202711492 U CN202711492 U CN 202711492U
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- parking space
- ultrasonic
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Abstract
The utility model discloses an ultrasonic stall information acquirer which comprises a single chip microcomputer and ultrasonic signal transmitting and receiving circuits connected with the single chip microcomputer, wherein the ultrasonic signal receiving circuit comprises an ultrasonic receiving device, a voltage following circuit, a signal amplifying circuit and a comparing and shaping circuit which are connected in sequence; and the signal output terminal of the comparing and shaping circuit is connected with the single chip microcomputer. The voltage following circuit is provided with an operational amplifier. The non-inverting input terminal of the operational amplifier is connected with one pole of the signal output terminal of the ultrasonic receiving device, and the signal output terminal of the operational amplifier is connected with the signal input terminal of the signal amplifying circuit and the inverting input terminal of the operational amplifier. The non-inverting input terminal is connected with an upper bias resistor and a lower bias resistor. The other pole of the signal output terminal of the ultrasonic receiving device is connected with the ground. The scheme can avoid the signal energy loss on a front-stage output resistor caused by the high resistance output of the ultrasonic receiving device when the ultrasonic receiving device is directly connected with a post-stage circuit, and can improve the sensitivity of the ultrasonic receiving device.
Description
Technical field
The utility model relates to the parking space information collection in parking lot, more particularly relates to a kind of ultrasound wave parking space information collection device.
Background technology
Along with the swift and violent increase of city dweller's automobile pollution, more and more outstanding in the contradiction between automobile and the parking stall in the crowded urban district.If can grasp in real time quantity and the positional information on vacant parking stall, can parking assisting field managerial personnel more abundant, utilize limited parking stall resource efficiently.
The disclosed parking space information collection device of technical literature adopts mostly now ultrasound wave transmitting/receiving external member, be utilize the parking stall car is arranged and without the car state under run into the principle of the asynchronism(-nization) that barrier reflects after the ultrasound wave emission, make car is arranged on the parking stall/without the judgement of car.Utilize the ultrasonic acquisition parking space information, detect principle and technical scheme simple, the information that collects is real-time, but, but finds to exist certain rate of false alarm in the practical application.For this situation, the technician often only expects setting about from aspects such as temperature humidity compensation, two-way ultrasound wave transmitting/receiving external members, and expectation improves the accuracy rate of ultrasound wave parking space information collection as much as possible.The inventor is by analyzing rear discovery to prior art: in the existing ultrasound wave parking space information collection circuit, ultrasonic receiver spare directly links to each other with wave filter or common employing of amplifier of rear class; Adopt so direct connected mode of front and back level, because ultrasonic receiver spare is output as high resistant, can cause the signal energy loss of a part in the output resistance of prime, this also is a major reason that affects the accuracy of ultrasound wave parking space information collection.
The utility model content
For overcoming the above deficiency of existing ultrasound wave parking space information collection circuit, the purpose of this utility model namely is to provide a kind of ultrasound wave parking space information collection device that can effectively reduce loss of signal in the ultrasonic measurement process, be convenient to more accurately gather parking position information of park.
The technical scheme that the utility model ultrasound wave parking space information collection device adopts: include single-chip microcomputer, the ultrasonic signal radiating circuit that links to each other with described single-chip microcomputer and ultrasonic signal receiving circuit; Comprise in the described ultrasonic signal radiating circuit adopting ultrasonic transmitter spare is arranged; Described ultrasonic signal receiving circuit includes ultrasonic receiver spare, voltage follower circuit, signal amplification circuit, the comparison shaping circuit that order links to each other; The described relatively signal output part of shaping circuit links to each other with the corresponding I/O mouth of single-chip microcomputer; Described ultrasonic transmitter spare and receiving device are located at the top of target parking stall, parking lot;
Described voltage follower circuit includes an amplifier; Wherein one extremely linking to each other of the in-phase input end of this amplifier and the signal output part of described ultrasonic receiver spare, the signal output part of this amplifier links to each other with the signal input part of described signal amplification circuit and the inverting input of this amplifier simultaneously; Also be connected with upper and lower biasing resistor on the described in-phase input end; Another utmost point ground connection of the signal output part of described ultrasonic receiver spare;
This parking space information collection device can adopt the CAN communication interface of described single-chip microcomputer or corresponding I/O mouth as the output terminal of the parking space information data that collect.
The concrete scheme of described ultrasonic signal radiating circuit can be joined mirror and be adopted prior art, does not repeat them here.
When the CAN communication interface of described single-chip microcomputer is set as the output terminal of parking space information collection data, by this CAN communication interface is linked to each other with CAN LAN (Local Area Network) and host computer, be convenient to realize that each parking space state information networking with the parking lot reports and unified management is carried out in the parking stall.At this moment, need to set up the CAN local area network communications module that links to each other for the CAN LAN (Local Area Network) in the CAN of described single-chip microcomputer communication interface, and the CAN communication interface of described single-chip microcomputer is linked to each other with the corresponding port of described CAN local area network communications module.In adopting the communication network of twisted-pair feeder as the CAN LAN (Local Area Network) of transmission line, damage device owing to easily disturbing because of the thunder and lightning transition, comprise also preferably in the described CAN local area network communications module adopting therefore that CAN bus protection circuit is arranged.
The utility model ultrasound wave parking space information collection device also can be provided with the function setting module that links to each other with described single-chip microcomputer, comprises for setting ultrasonic reflections distance threshold (or time threshold) and the mailing address of this collector when linking the CAN LAN (Local Area Network) etc.Described function setting can adopt the mode that toggle switch is set and is equipped with relevant embedded software at the corresponding I/O mouth of described single-chip microcomputer to realize; Described mailing address is set, and can also connect PC by the serial ports at described single-chip microcomputer, the mailing address of ultrasound wave parking space information collection device is set one by one by upper computer software by PC; Perhaps, can also adopt other method to realize according to personal like and custom by the project planner.
Consider that the ultrasound wave parking space information collection device quantity that need install when carrying out project installation in the parking lot is more; the situation of collector wrong line can appear this moment unavoidably; just in case power lead connects instead; very easily cause all the ultrasound wave parking space information collection device short circuits in the whole piece supply line; owing to being unfavorable for investigation; when serious even may burn out all ultrasound wave parking space information collection devices in the same supply line; therefore; as the improvement to above-mentioned ultrasound wave parking space information collection device technical scheme; between the power input of described single-chip microcomputer and the dc power supply of described single-chip microcomputer, can also increase and be serially connected with the power supply input protection circuit.The particular content of this power supply input protection circuit and access scheme are: behind the positive pole of the dc power supply serial connection fuse, directly or indirectly to be connected to the power input of described single-chip microcomputer after step-down anodal; The negative pole of dc power supply is connected to the drain electrode of a N channel enhancement field effect transistor; The source electrode of this field effect transistor connects the earth terminal of described single-chip microcomputer, and its grid is connected in series behind the resistance also directly or indirectly is connected to the power input of described single-chip microcomputer after step-down anodal.That is: this power supply input protection circuit can be located between dc power supplies at different levels and its direct load as required; this load can refer to final load single-chip microcomputer (at this moment; this power supply input protection circuit is connected between the primary power pin and its direct power supply of single-chip microcomputer); subordinate's dc power supply in the time of also can referring to adopt multistage dc power supply (at this moment, this power supply input protection circuit is connected between the output terminal of the input end of subordinate's dc power supply and its higher level's dc power supply).Preferably be connected between single-chip microcomputer and its direct power supply.
Depending on concrete actual needs, the utility model ultrasound wave parking space information collection device also can be provided with the parking space state indicating circuit that I/O mouth corresponding to single-chip microcomputer is connected, and is convenient to that guided vehicle is parked and the parking stall management.
Comparison shaping circuit in the such scheme, can adopt following scheme to realize: adopting in this comparison shaping circuit has comparer; The in-phase input end of this comparer links to each other with the signal output part of described signal amplification circuit, its inverting input is provided with comparative level by connecting upper and lower biasing resistor, and the output terminal of comparer is connected to a middle fracture of described single-chip microcomputer directly or indirectly.The preferred relatively shaping circuit of following two-way that adopts: every road has relatively included a comparer in the shaping circuit; The in-phase input end of two comparers all links to each other with the signal output part of described signal amplification circuit, the inverting input of two comparers is provided with different inverting input comparative levels by connecting upper and lower biasing resistor separately, and each is connected to a middle fracture of described single-chip microcomputer directly or indirectly the output terminal of two comparers.Adopt this scheme, get final product corresponding different measurement ranges by different comparative levels is set, the automatic switchover that can also realize measuring range in conjunction with embedded software, thereby, only adopt a pair of ultrasonic receiver spare just can finish multi-range measurement.
Because it is usually very faint that ultrasonic receiver spare receives the ultrasonic signal that reflects, and may contain other high-frequency interferencing signal, as another improvement to above-mentioned ultrasound wave parking space information collection device technical scheme, between the middle fracture of the output terminal of described comparer and described single-chip microcomputer, also be connected with low-pass filter, filtering out high-frequency interferencing signal, and small and weak ultrasonic signal is tentatively amplified.In like manner, described signal amplification circuit part also can be set up filter function according to actual needs.
By upper, the utility model ultrasound wave parking space information collection utensil has following characteristics and advantage:
(1) by between the signal input part of the signal output part of ultrasonic receiver spare and signal amplification circuit, adding voltage follower circuit, can avoid ultrasonic receiver spare in the prior art directly with the filtering of rear class/when amplifying circuit adopts and directly is connected, owing to ultrasonic receiver spare is that high resistant is exported and caused the part signal energy loss on the output resistance of prime, cause the situation of meaningless energy consumption to occur, the simultaneously saving of this signal energy obviously also helps to improve the sensitivity of ultrasonic receiver spare.When adopting active band-pass filter in the signal amplification circuit, because the output impedance of ultrasonic receiver spare is higher, adds this voltage follower circuit and also help to improve input impedance for active band-pass filter.
(2) mostly adopt a pair of ultrasonic transducer to measure with the disclosed ultrasound wave parking space information collection of prior art document device, it measures the range fixed single, switching range needs manually to change gear and use two pairs of ultrasonic transducers, every a pair of probe configures set of parameter to realize multi-range measurement, but owing to adopting two pairs of ultrasonic transducers to cause needs to use the two paths of signals treatment circuit, number of elements is more, the circuit arrangement that cost is higher is compared, when technical solutions of the utility model use two-way to compare shaping circuit, only be required to be each road and respectively configure set of parameter, cooperation is with the automatic State selective measurements circuit of embedded software, can realize only adopting a pair of ultrasonic receiver spare just to carry out multi-range measurement, and can also improve the measuring precision, save cost.Compared with prior art, this circuit structure is advantages of simple more, and cost is lower.
When (3) setting up the power supply input protection circuit, line short and the economic loss that can effectively avoid the reversal connection of power lead mistake to cause.Generally be at an input end serial connection diode (utilizing power supply to connect the principle of inverse time not conducting of diode reverse), still when working, approximately have the tube voltage drop of 0.6-0.7V, the scheme that meeting produces energy consumption to compare with existing power supply input reverse connection prevention protection circuit; this power supply reverse connection protection holding circuit adopts the N channel enhancement field effect transistor of conducting resistance extremely low (being about 52m Ω); because it has minimum tube voltage drop (when working current is 1A during conducting; tube voltage drop is 0.052V approximately), therefore have effect more energy-conservation, low-carbon (LC).
(4) have additional for CAN local area network communications module that the CAN LAN (Local Area Network) links to each other the time, be convenient to realize that each parking space state information networking with the parking lot reports and unified management is carried out in the parking stall, even may realize that the parking space information between the different parking lots shares.
(5) have additional and comprise when setting the function setting module of the mailing address of collector when linking the CAN LAN (Local Area Network), can convenient, fast even the mailing address of automatic setting collector in the CAN LAN (Local Area Network) and other parameter of collector in conjunction with embedded software.
Description of drawings
Fig. 1 is that the circuit structure of an embodiment of the utility model ultrasound wave parking space information collection device forms schematic block diagram.
Fig. 2 is the principle schematic of the voltage follower circuit among the embodiment of the utility model ultrasound wave parking space information collection device.
Fig. 3 is the principle schematic of the power supply input protection circuit among the embodiment of the utility model ultrasound wave parking space information collection device.
Fig. 4 is the principle schematic of the comparison shaping circuit among the embodiment of the utility model ultrasound wave parking space information collection device.
Embodiment
Below in conjunction with accompanying drawing the utility model ultrasound wave parking space information collection device is further described.
Fig. 1 is that the circuit structure of an embodiment of the utility model ultrasound wave parking space information collection device forms schematic block diagram.The utility model ultrasound wave parking space information collection device as shown in the figure mainly is comprised of with the ultrasonic signal radiating circuit that links to each other with the single-chip microcomputer corresponding port, ultrasonic signal receiving circuit, power supply input protection circuit, CAN local area network communications module, parking space state indicating circuit, function setting module single-chip microcomputer.Adopting respectively in described ultrasonic signal radiating circuit and the ultrasonic signal receiving circuit has ultrasonic transmitter spare and receiving device, all is located at the top of target parking stall, parking lot.This parking space information collection device can adopt the CAN communication interface of described single-chip microcomputer or corresponding I/O mouth as the output terminal of the parking space information data that collect.
Ultrasonic signal radiating circuit among Fig. 1 can adopt following scheme to realize: by the control single chip computer timer internal, via one of them timer output pin output 40KHz of single-chip processor i/o mouth or single-chip microcomputer, the oscillator signal of dutycycle 50%, warp let-off ultrasonic signal driving circuit amplifies rear drive ultrasonic transmitter spare emission ultrasound wave.Certainly, also can adopt other ultrasonic signal radiating circuit of the prior art, for example: produce ultrasound wave by Single-chip Controlling one ultrasonic output circuit, amplify rear drive ultrasonic transmitter spare emission ultrasound wave through signal.
Described ultrasonic signal receiving circuit includes ultrasonic receiver spare, voltage follower circuit, signal amplification circuit, comparison shaping circuit that order links to each other as shown in Figure 1; The signal output part of described relatively shaping circuit links to each other with the corresponding I/O end of single-chip microcomputer; Described voltage follower circuit includes amplifier U3A as shown in Figure 2; Wherein one extremely linking to each other of the in-phase input end of this amplifier U3A and the signal output part of described ultrasonic receiver spare, the signal output part OUT of this amplifier U3A links to each other with the signal input part of the signal amplification circuit of the inverting input of this amplifier and rear class simultaneously; Also be connected with upper and lower biasing resistor R4 and R8 on the described in-phase input end; Another utmost point ground connection of the signal output part of described ultrasonic receiver spare.
Ultrasonic receiver spare received obtain before the ultrasonic reflections signal amplifies, because this signal is very faint, and may contain and use other high-frequency interferencing signal, can filter out high-frequency interferencing signal by active band-pass filter first, adopt again two-stage inverse proportion amplifying circuit that the signal of active band-pass filter output is amplified.Because the output impedance of ultrasonic receiver spare is higher, the employing of voltage follower circuit also helps to improve the input impedance of active band-pass filter, reduces circuit energy consumption and the loss of signal, thus the sensitivity that helps to improve ultrasonic receiver spare.
Power supply input protection circuit shown in Fig. 1 can be used for reference and adopt power supply input protection circuit of the prior art, also can specifically adopt circuit shown in Figure 3 to realize: the anodal VCC_IN serial connection fuse F1(recommendation resettable fuse of dc power supply), directly or after step-down, indirectly be connected to the anodal VCC of power input of described single-chip microcomputer; The negative pole of dc power supply is connected to the drain electrode of a N channel enhancement field effect transistor Q1; The source electrode of this field effect transistor Q1 connects the earth terminal of described single-chip microcomputer, and its grid is connected in series after the resistance R 30 also directly or indirectly is connected to the anodal VCC of power input of described single-chip microcomputer after step-down.This power supply input protection circuit can directly be connected between single-chip microcomputer and its direct power supply, and also can be connected on as single-chip microcomputer provides between the dc power supplies at different levels of power supply.The principle of work of this power supply input protection circuit: when the power supply forward was inputted, the conducting of N channel enhancement field effect transistor because its tube voltage drop is minimum, thereby can be the rear class load normal power supply is provided; And during reversal of power input (being reversal connection), not conducting of field effect transistor, rear class load can be not damaged; When power supply forward input current was excessive, protective tube blew, thus the performance protective effect.As required, also can in this power supply input protection circuit, set up light emitting diode, so that the reverse power connection alarm to be provided.
Comparison shaping circuit shown in Fig. 1 can be used for reference and adopt relatively shaping circuit of the prior art, also can specifically adopt relatively shaping circuit realization of two-way shown in Figure 4: included comparer U4A or a U4B in the two-way comparison shaping circuit; The in-phase input end of two comparers all links to each other with the signal output part (indicating " IN " among the figure locates) of the signal amplification circuit of prime, the inverting input of two comparers is provided with different inverting input comparative levels by connecting upper offset resistance R 14 or R21, below-center offset resistance R 17 or R24 separately, and the output terminal of two comparers respectively is connected to middle fracture INT10 or the INT11 of described single-chip microcomputer.Adopt relatively shaping circuit of two-way, be convenient to for the parking lot with different parking stalls height different measurement ranges is set.Do not need to change the situation of measuring range, also can only adopt road comparison shaping circuit wherein.In the present embodiment, between the middle fracture of the output terminal of described comparer and described single-chip microcomputer, as shown in Figure 4, can also be connected with the RC low-pass filter circuit.
For ease of unified management is carried out in numerous parking stalls, the parking space information collection device of the present embodiment can connect and be integrated with the CAN local area network communications module by the CAN communication interface of single-chip microcomputer, link to each other with host computer to be used for the passing through CAN LAN (Local Area Network).Preferably also comprise in the described CAN local area network communications module adopting CAN bus protection circuit is arranged.The specific implementation of described CAN local area network communications module and CAN bus protection circuit can be used for reference prior art.
As required, the corresponding I/O mouth of described single-chip microcomputer also is connected with the function setting module, is used for setting ultrasonic reflections time threshold, CAN local area network communication baud rate and the mailing address of this collector when linking the CAN LAN (Local Area Network) etc.Described function setting can adopt the mode that toggle switch is set and is equipped with relevant embedded software at the corresponding I/O mouth of described single-chip microcomputer to realize; Described mailing address is set, can also connect PC by the serial ports at described single-chip microcomputer, the mailing address of ultrasound wave parking space information collection device is set one by one by upper computer software by PC, even, distributed by the CAN local area network communications module by upper computer software by PC; Perhaps, can also adopt other method to realize according to personal like and custom by the project planner.
The concrete type selecting of single-chip microcomputer can be selected according to the actual functional capability needs voluntarily by those skilled in the art described in the utility model ultrasound wave parking space information collection device, for example when needs are used the CAN communication interface, can select the STM32 single-chip microcomputer.
Claims (8)
1. ultrasound wave parking space information collection device includes single-chip microcomputer, the ultrasonic signal radiating circuit that links to each other with described single-chip microcomputer and ultrasonic signal receiving circuit; Comprise in the described ultrasonic signal radiating circuit adopting ultrasonic transmitter spare is arranged; It is characterized in that: described ultrasonic signal receiving circuit includes ultrasonic receiver spare, voltage follower circuit, signal amplification circuit, the comparison shaping circuit that order links to each other; The described relatively signal output part of shaping circuit links to each other with the corresponding I/O mouth of single-chip microcomputer; Described ultrasonic transmitter spare and receiving device are located at the top of target parking stall, parking lot;
Described voltage follower circuit includes an amplifier; Wherein one extremely linking to each other of the in-phase input end of this amplifier and the signal output part of described ultrasonic receiver spare, the signal output part of this amplifier links to each other with the signal input part of described signal amplification circuit and the inverting input of this amplifier simultaneously; Also be connected with upper and lower biasing resistor on the described in-phase input end; Another utmost point ground connection of the signal output part of described ultrasonic receiver spare;
This parking space information collection device adopts the CAN communication interface of described single-chip microcomputer or corresponding I/O mouth as the output terminal of the parking space information data that collect.
2. ultrasound wave parking space information collection device according to claim 1, it is characterized in that, between the power input of described single-chip microcomputer and the dc power supply of described single-chip microcomputer, also comprise and be serially connected with the power supply input protection circuit: behind the positive pole of the dc power supply serial connection fuse, directly or indirectly to be connected to the power input of described single-chip microcomputer after step-down anodal; The negative pole of dc power supply is connected to the drain electrode of a N channel enhancement field effect transistor; The source electrode of this field effect transistor connects the earth terminal of described single-chip microcomputer, and its grid is connected in series behind the resistance also directly or indirectly is connected to the power input of described single-chip microcomputer after step-down anodal.
3. ultrasound wave parking space information collection device according to claim 1 is characterized in that: also include the CAN local area network communications module that links to each other for the CAN LAN (Local Area Network); Described single-chip microcomputer links to each other with described CAN local area network communications module by its CAN communication interface.
4. ultrasound wave parking space information collection device according to claim 3 is characterized in that: in the described CAN local area network communications module, comprise also adopting that CAN bus protection circuit is arranged.
5. ultrasound wave parking space information collection device according to claim 1 is characterized in that: also include the parking space state indicating circuit that I/O mouth corresponding to described single-chip microcomputer is connected.
6. according to claim 1 to one of 5 described ultrasound wave parking space information collection devices, it is characterized in that: described relatively shaping circuit includes comparer; The in-phase input end of this comparer links to each other with the signal output part of described signal amplification circuit, its inverting input is provided with comparative level by connecting upper and lower biasing resistor, and the output terminal of comparer is connected to a middle fracture of described single-chip microcomputer directly or indirectly.
7. ultrasound wave parking space information collection device according to claim 6 is characterized in that, what described relatively shaping circuit adopted is relatively shaping circuit of two-way: every road has relatively included a comparer in the shaping circuit; The in-phase input end of two comparers all links to each other with the signal output part of described signal amplification circuit, the inverting input of two comparers is provided with different inverting input comparative levels by connecting upper and lower biasing resistor separately, and each is connected to a middle fracture of described single-chip microcomputer directly or indirectly the output terminal of two comparers.
8. ultrasound wave parking space information collection device according to claim 7 is characterized in that: between the middle fracture of the output terminal of described comparer and described single-chip microcomputer, also be connected with low-pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220401381 CN202711492U (en) | 2012-08-14 | 2012-08-14 | Ultrasonic stall information acquirer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220401381 CN202711492U (en) | 2012-08-14 | 2012-08-14 | Ultrasonic stall information acquirer |
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| CN202711492U true CN202711492U (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220401381 Expired - Fee Related CN202711492U (en) | 2012-08-14 | 2012-08-14 | Ultrasonic stall information acquirer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104318804A (en) * | 2014-10-28 | 2015-01-28 | 成都和音科技有限公司 | Signal-sensitive sensing device |
| CN104318805A (en) * | 2014-10-28 | 2015-01-28 | 成都和音科技有限公司 | Sensing bar for parking |
-
2012
- 2012-08-14 CN CN 201220401381 patent/CN202711492U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104318804A (en) * | 2014-10-28 | 2015-01-28 | 成都和音科技有限公司 | Signal-sensitive sensing device |
| CN104318805A (en) * | 2014-10-28 | 2015-01-28 | 成都和音科技有限公司 | Sensing bar for parking |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20180814 |