CN105652275A - Vehicle-mounted intelligent range finding system based on single-chip microcomputer - Google Patents
Vehicle-mounted intelligent range finding system based on single-chip microcomputer Download PDFInfo
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- CN105652275A CN105652275A CN201410625841.1A CN201410625841A CN105652275A CN 105652275 A CN105652275 A CN 105652275A CN 201410625841 A CN201410625841 A CN 201410625841A CN 105652275 A CN105652275 A CN 105652275A
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Abstract
The invention discloses a vehicle-mounted intelligent range finding system based on a single-chip microcomputer. The system comprises a single-chip microcomputer, an ultrasonic sensor, a pulse generator, an amplifier, a filter and an amplitude discriminator, wherein the output end of the single-chip microcomputer is connected with the pulse generator, the pulse generator is connected with a transmitter of the ultrasonic sensor via a driver, the output end of a receiver is connected with the amplifier, the output end of the amplifier is connected with an automatic multiplier, the output end of the automatic multiplier is connected with the input end of the filter, the output end of the filter is connected with the amplitude discriminator, the output end of the amplitude discriminator is connected with a first analog-to-digital converter, the first analog-to-digital converter is connected with the input end of the single-chip microcomputer, and the output end of the single-chip microcomputer is connected with a voice alarm circuit and a braking mechanism which is used for starting or shutting down a vehicle engine. According to the range finding system, the ultrasonic sensor is applied to vehicle range finding, the single-chip microcomputer serves as a data processing core, and therefore, drivers can timely know whether the distance between a vehicle and other vehicles or objects is safe during backing up.
Description
Technical field
The present invention relates to a kind of range-measurement system, be specifically related to a kind of SCM Based vehicle mount intelligence rang measuring system.
Background technology
Along with the raising of people's living standard, private car is more and more universal, and urban roads safety increasingly comes into one's own. Owing to driver's technical merit is uneven, traffic route situation is complicated and changeable, and flow of the people, vehicle flowrate are greatly increased, and urban traffic road security incident happens occasionally. Vehicle-mounted distance-finding system base is driven aid as one, it is possible to well help driver complete to move storehouse fall storehouse, stop in position, side, complex road condition is driven, be widely used. But most of vehicle-mounted distance-finding system base functions are more single, and real-time is poor, and certainty of measurement cannot meet scorch demand.
Summary of the invention
It is an object of the invention to overcome above-mentioned deficiency of the prior art, it is provided that a kind of SCM Based vehicle mount intelligence rang measuring system. The simple in construction of this vehicle mount intelligence rang measuring system, reasonable in design, small volume and less weight, utilize ultrasonic sensor to detect, rapidly, convenient, calculating is simple, it is easy to accomplish control in real time and certainty of measurement can meet requirement. Ultrasonic sensor is used for vehicle ranging by the present invention, with single-chip microcomputer as the core processing data, and adopt instrument in car to carry out data to show, send voice signal simultaneously, make driver understand in time automobile when reversing with the distance of other automobiles or object whether safety.
For achieving the above object, the technical solution used in the present invention is: a kind of SCM Based vehicle mount intelligence rang measuring system, it is characterized in that: include single-chip microcomputer, for sending ultrasound wave to measure front truck spacing and the ultrasonic sensor of rear car spacing, for sending pulse signal to trigger the pulse generator of described single-chip microcomputer timer internal and ultrasonic sensor transmitter, amplifier that ultrasonic echo for ultrasonic sensor receptor is received carries out signal amplification and the wave filter that amplified ultrasound echo signal is filtered, and the amplitude discriminator for described ultrasound echo signal after filtering is detected,The outfan of described single-chip microcomputer connects with pulse generator, and described pulse generator is connected with the transmitter of ultrasonic sensor by driver; The outfan of described receptor connects with amplifier, the outfan of described amplifier is connected to automatic gain device, the described outfan of automatic gain device connects with the input of wave filter, the outfan of described wave filter connects with amplitude discriminator, the outfan of described amplitude discriminator is connected to the first analog-digital converter, described first analog-digital converter connects with the input of single-chip microcomputer, and the outfan of described single-chip microcomputer is connected to voice alarm circuit and for starting or the arrestment mechanism of closing automobile electromotor.
The SCM Based vehicle mount intelligence rang measuring system of above-mentioned one, it is characterised in that: also including temperature sensor, the outfan of described temperature sensor is connected to the second analog-digital converter, and described second analog-digital converter connects with the input of single-chip microcomputer.
The SCM Based vehicle mount intelligence rang measuring system of above-mentioned one, it is characterised in that: described single-chip microcomputer is AT89C52 single-chip microcomputer.
The SCM Based vehicle mount intelligence rang measuring system of above-mentioned one, it is characterised in that: the quantity of described ultrasonic sensor is two, and a ultrasonic sensor is arranged on the front end of vehicle, and another ultrasonic sensor is arranged on the rear end of vehicle.
The SCM Based vehicle mount intelligence rang measuring system of above-mentioned one, it is characterised in that: the outfan of described single-chip microcomputer is connected to for showing and the display of front truck spacing and rear car spacing.
The SCM Based vehicle mount intelligence rang measuring system of above-mentioned one, it is characterised in that: described display is LCD display.
The present invention compared with prior art has the advantage that
1, the present invention is by the automobile intelligent range-measurement system of ultrasonic sensor and single-chip microcomputer design, it is easy to design and installation are safeguarded.
2, the present invention adopts single-chip microcomputer to carry out the process of data, the control of system, and Function Extension is convenient, price material benefit.
3, present system adds temperature-compensation circuit, pinpoint accuracy and stable performance and is greatly improved the safety coefficient of driving at night, safe avoidance and reversing.
Below by drawings and Examples, technical scheme is described in further detail.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of the present invention.
Description of reference numerals:
1 single-chip microcomputer; 2 pulse generators; 3 drivers;
4 transmitters; 5 voice alarm circuit; 6 first analog-digital converters;
7 amplitude discriminators; 8 wave filter; 9 automatic gain devices;
10 amplifiers; 11 receptors; 12 arrestment mechanisms;
13 second analog-digital converters; 14 temperature sensors; 15 display.
Detailed description of the invention
The SCM Based vehicle mount intelligence rang measuring system of one as shown in Figure 1, including single-chip microcomputer 1, for sending ultrasound wave to measure front truck spacing and the ultrasonic sensor of rear car spacing, for sending pulse signal to trigger the pulse generator 2 of described single-chip microcomputer 1 timer internal and ultrasonic sensor transmitter 4, amplifier 10 that ultrasonic echo for ultrasonic sensor receptor 11 is received carries out signal amplification and the wave filter 8 that amplified ultrasound echo signal is filtered, and the amplitude discriminator 7 for described ultrasound echo signal after filtering is detected, the outfan of described single-chip microcomputer 1 connects with pulse generator 2, and described pulse generator 2 is connected with the transmitter 4 of ultrasonic sensor by driver 3,The outfan of described receptor 11 connects with amplifier 10, the outfan of described amplifier 10 is connected to automatic gain device 9, the outfan of described automatic gain device 9 connects with the input of wave filter 8, the outfan of described wave filter 8 connects with amplitude discriminator 7, the outfan of described amplitude discriminator 7 is connected to the first analog-digital converter 6, described first analog-digital converter 6 connects with the input of single-chip microcomputer 1, and the outfan of described single-chip microcomputer 1 is connected to voice alarm circuit 5 and for starting or the arrestment mechanism 12 of closing automobile electromotor.
As it is shown in figure 1, described vehicle mount intelligence rang measuring system also includes the temperature sensor 14 for temperature-compensating, the outfan of described temperature sensor 14 is connected to the second analog-digital converter 13, and described second analog-digital converter 13 connects with the input of single-chip microcomputer 1.
In the present embodiment, described single-chip microcomputer 1 is AT89C52 single-chip microcomputer.
In the present embodiment, the quantity of described ultrasonic sensor is two, and a ultrasonic sensor is arranged on the front end of vehicle, and another ultrasonic sensor is arranged on the rear end of vehicle.
As it is shown in figure 1, the outfan of described single-chip microcomputer 1 is connected to for showing the display 15 with front truck spacing and rear car spacing. In the present embodiment, described display 15 is LCD display.
In the present embodiment, pulse generator 2 sends pulse signal, while promoting the transmitter 4 of ultrasonic sensor to work by driver 3, while triggering single-chip microcomputer 1 timer internal, start timing, the ultrasonic echo that ultrasonic sensor receptor 11 receives, after amplifying, filtering, is directly fed to amplitude discriminator 7, or extracts the echo-peak reference information as threshold value through peak holding circuit. Single-chip microcomputer 1 can sampled echo peak value, as differentiating wealthy value after software weighting processes, then give amplitude discriminator 7 and compare. When in echo envelope, certain ripple is identified, trigger external interrupt INT 1 immediately, timeing closing device. Detection window is set simultaneously, by differentiating echo number n in count detection window, determine that according to n next time differentiates the size of set-point again, then from compensating the offset that table, taking-up is corresponding with n, to the timing time of intervalometer (namely from launching ultrasound wave to receiving the 1st count value differentiated echo, count cycle is 1us) it is modified, it is thus achieved that in the reciprocal propagation time that ultrasound wave is actual, obtain distance again through 3 byte floating-point operations. Display 15 is sent to show by single-chip microcomputer 1 serial communication port. Owing to ultrasound wave is a kind of sound wave, its speed is relevant with temperature, so system also needs timing that ambient temperature is sampled, carry out temperature-compensating in a program, to revise the velocity of sound. ultrasonic sensor is arranged on automobile tail and rear wheel position, if the system detects that risk distance, single-chip microcomputer 1 is controlled by I/O mouth and sends voice message, or start arrestment mechanism 12, it is prevented that unexpected generation.
In the present embodiment, the hardware circuit supersonic generator of described transmitter 4 and receptor 11 ceaselessly to send 175kHz��215kHz altofrequency sound wave, and receptor 11 receives the sound wave reflected simultaneously. Acceptance division parallel circuit receives echo, after filtered and two-stage is amplified, the P1.1 mouth that output signal delivers to single-chip microcomputer 1 is carried out data process. The range data detected is transmitted by Serial Port Line, is converted into parallel data control LCD and carries out Dynamic Announce, and audio alert signal is exported by the P2.1 mouth of single-chip microcomputer 1.
If propagation medium is more stable, and temperature is the principal element affecting spread speed, then can adopt temperature sensor 14 that ultrasonic velocity is carried out real time correction, concrete grammar is: be determined by experiment in propagation medium ultrasonic velocity and the relation curve asked of temperature, by the relation database table of certain temperature interval degree of being truncated to Yu temperature, finally weave into software and be stored in the hardware system of ultrasonic sensor.During real time distance, system obtains the real time temperature of medium by temperature sensor 14, then from speed and extraction corresponding speed temperature relation table, thus measuring distance. For the object of difformity and position, echo shape is roughly the same, and simply amplitude is different. to this, variable threshold value amplitude discrimination fixed compensation method can be adopted.
In sum, the present invention's is practical, it is easy to design and installation are safeguarded. Function Extension is convenient, price material benefit. The pinpoint accuracy of system and stable performance are greatly improved the safety coefficient of driving at night, safe avoidance and reversing. Along with the development of communications, the application prospect of single-chip microcomputer vehicle-mounted distance-finding system base is boundless.
The above; it it is only presently preferred embodiments of the present invention; not the present invention is imposed any restrictions, every any simple modification, change and equivalent structure transformation above example made according to the technology of the present invention essence, all still fall within the protection domain of technical solution of the present invention.
Claims (6)
1. a SCM Based vehicle mount intelligence rang measuring system, it is characterized in that: include single-chip microcomputer (1), for sending ultrasound wave to measure front truck spacing and the ultrasonic sensor of rear car spacing, for sending pulse signal to trigger the pulse generator (2) of described single-chip microcomputer (1) timer internal and ultrasonic sensor transmitter (4), amplifier (10) that ultrasonic echo for ultrasonic sensor receptor (11) is received carries out signal amplification and the wave filter (8) that amplified ultrasound echo signal is filtered, and the amplitude discriminator (7) for described ultrasound echo signal after filtering is detected, the outfan of described single-chip microcomputer (1) connects with pulse generator (2), and described pulse generator (2) is connected with the transmitter (4) of ultrasonic sensor by driver (3), the outfan of described receptor (11) connects with amplifier (10), the outfan of described amplifier (10) is connected to automatic gain device (9), the outfan of described automatic gain device (9) connects with the input of wave filter (8), the outfan of described wave filter (8) connects with amplitude discriminator (7), the outfan of described amplitude discriminator (7) is connected to the first analog-digital converter (6), described first analog-digital converter (6) connects with the input of single-chip microcomputer (1), the outfan of described single-chip microcomputer (1) is connected to voice alarm circuit (5) and for starting or the arrestment mechanism (12) of closing automobile electromotor.
2. the SCM Based vehicle mount intelligence rang measuring system of one according to claim 1, it is characterized in that: also include temperature sensor (14), the outfan of described temperature sensor (14) is connected to the second analog-digital converter (13), and described second analog-digital converter (13) connects with the input of single-chip microcomputer (1).
3. the SCM Based vehicle mount intelligence rang measuring system of one according to claim 1, it is characterised in that: described single-chip microcomputer (1) is AT89C52 single-chip microcomputer.
4. the SCM Based vehicle mount intelligence rang measuring system of one according to claim 1, it is characterized in that: the quantity of described ultrasonic sensor is two, one ultrasonic sensor is arranged on the front end of vehicle, and another ultrasonic sensor is arranged on the rear end of vehicle.
5. the SCM Based vehicle mount intelligence rang measuring system of one according to claim 1, it is characterised in that: the outfan of described single-chip microcomputer (1) is connected to for showing the display (15) with front truck spacing and rear car spacing.
6. the SCM Based vehicle mount intelligence rang measuring system of one according to claim 5, it is characterised in that: described display (15) is LCD display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410625841.1A CN105652275A (en) | 2014-11-09 | 2014-11-09 | Vehicle-mounted intelligent range finding system based on single-chip microcomputer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410625841.1A CN105652275A (en) | 2014-11-09 | 2014-11-09 | Vehicle-mounted intelligent range finding system based on single-chip microcomputer |
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| CN105652275A true CN105652275A (en) | 2016-06-08 |
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| CN201410625841.1A Pending CN105652275A (en) | 2014-11-09 | 2014-11-09 | Vehicle-mounted intelligent range finding system based on single-chip microcomputer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108364628A (en) * | 2018-01-05 | 2018-08-03 | 浙江警察学院 | A kind of note controller adjusts the method and system of tone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108364628A (en) * | 2018-01-05 | 2018-08-03 | 浙江警察学院 | A kind of note controller adjusts the method and system of tone |
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Application publication date: 20160608 |