CN102455424A - Ultrasonic automobile reversing radar system - Google Patents
Ultrasonic automobile reversing radar system Download PDFInfo
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- CN102455424A CN102455424A CN2010105208826A CN201010520882A CN102455424A CN 102455424 A CN102455424 A CN 102455424A CN 2010105208826 A CN2010105208826 A CN 2010105208826A CN 201010520882 A CN201010520882 A CN 201010520882A CN 102455424 A CN102455424 A CN 102455424A
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Abstract
The invention relates to an ultrasonic automobile reversing radar system. The ultrasonic-based novel automobile reversing radar system avoids collision of automobiles during reversing. The system consists of a singlechip control circuit, an ultrasonic transmitting and receiving circuit, a temperature compensation circuit, a liquid crystal display (LCD) circuit, a voice alarm circuit and the like. The SST89E58RD2 singlechip is a core component of the whole system, and is used for coordinating the operation of each circuit. The singlechip starts timing when ultrasonic signals are transmitted, the ultrasonic signals are transmitted in the air and reflected by an obstacle, the reflected echo signals are processed and input to an external interruption port of the singlechip and interrupted, and the singlechip stops timing. The time required by the round trip of the ultrasonic signals can be acquired through the singlechip, and the distance between the body and the obstacle can be acquired by combining the sound velocity after temperature compensation.
Description
Technical field
The present invention relates to a kind ofly, avoid automobile in reversing process, to bump based on hyperacoustic new automobile reverse radar system.
Background technology
Reverse radar system in the automobile industry mainly is at present: remind through loudspeaker (1), and " reversing please notes, moveing backward please notes! ", I believe that many people also remember this sound.As long as the driver hangs up reverse gear, loudspeaker will sound, and this does not directly help the driver, is not real radar for backing car, and are just careful prompting passerby.(2) adopt hummer to produce alternative sounds and point out the driver, during reversing, hummer sends the sound of " di, di, di ".Barrier is arranged in the certain distance behind car during reversing, and hummer will be started working, and buzzer is anxious more, and the expression vehicle is near more from barrier.Because there is not voice suggestion, there is not distance display yet, though the driver knows barrier is arranged, how far be not sure of barrier has from car body, so the driver is helped not quite.(3) reverse radar system of digital band demonstration, this system can show that car and obstruction leaves the distance of car body, but degree of accuracy is not high, it is not attractive in appearance to install.(4) magic mirror radar for backing car, it uses up-to-date bionical ultrasonic radar technology, is equipped with high-speed electronic calculator control, can round-the-clockly predict 2 meters exactly with interior barrier, and with the auditory tone cues of different brackets and display alarm driver intuitively.The magic mirror radar for backing car can combine multinomial functions such as rearview mirror, radar for backing car, hands-free phone, temperature demonstration and in-vehicle air pollution demonstration, and has designed phonetic function.The function of this generation radar for backing car is more, but cost is also than higher.
Summary of the invention
The present invention's purpose is to remedy above-mentioned deficiency, and it is lower to disclose a kind of cost to society, good environmental adaptability based on hyperacoustic new automobile reverse radar system.
Design proposal of the present invention is such: based on hyperacoustic new automobile reverse radar system.This system is made up of several parts such as single chip machine controlling circuit, ultrasonic emitting and receiving circuit, temperature-compensation circuit, LCD display circuit and voice alarm circuit.The SST89E58RD2 single-chip microcomputer is the core component of total system, coordinates the work of each several part circuit.Single-chip microcomputer picks up counting in ultrasonic signal emission, and ultrasonic signal is propagated in air, launches after running into barrier, and the external interrupt mouth that the echoed signal of reflection is input to single-chip microcomputer after treatment produces interruption, and single-chip microcomputer stops timing.Can obtain ultrasonic signal through single-chip microcomputer and come and go the needed time, combine the velocity of sound after the temperature compensation can try to achieve the distance between car body and the barrier again.Ultrasonic sensor is selected the transmitting-receiving integrated ultrasonic sensor of TCF40-25TR1 type for use, and resonance frequency is 40KHz.Ultrasound emission and receiving circuit adopt LM1812 specialty integrated chip to design; Temperature-compensation circuit adopts one wire system digital temperature sensor DS18B20, utilizes the relation between the velocity of sound and the temperature that the velocity of sound is revised; Voice alarm circuit adopts speech chip ISD4004, can realize the segmentation audio alert function in the reversing automobile process.
Advantage of the present invention is:
Because the present invention is hyperacoustic a kind of reverse radar system, adopt LM1812 specialty integrated chip to design, not only peripheral cell is less, and circuit is simple, and better stability and reliability are arranged.
Because the present invention is hyperacoustic a kind of reverse radar system, has eliminated the influence of temperature to the velocity of sound, realize the segmentation audio alert function in the reversing automobile process.
Description of drawings
Fig. 1 is clock circuit of the present invention and reset circuit;
Fig. 2 is 14 pin and the transmitted wave oscillogram of LM1812 of the present invention.
Embodiment
Below in conjunction with the accompanying drawing instance the present invention is done and to describe in further detail.
Power circuit: the power circuit of native system mainly by an AC-DC+power supply adaptor, two three-terminal regulator blocks (LM7805, LM1117-3.3), some filter capacitors and the LED lights etc. of 12V form.
Reset circuit and clock circuit: native system has a hand-reset end, and no matter single-chip microcomputer is in normal operating condition, still when endless loop (forming the deadlock phenomenon) appears in single-chip microcomputer, presses the hand-reset end, and system will be forced and reset, and return to original state.Quartz oscillator in the clock circuit of system adopts external form, and external crystal oscillator frequency is 12MHz.The reset circuit of SST89E58RD2 single-chip microcomputer and clock circuit such as Fig. 1.
The ISP in-circuit emulation circuit of 4SST89E58RD2 single-chip microcomputer: native system adopts rs-232 standard serial ports realization single-chip microcomputer to communicate by letter with computer by serial; Select for use the MAX232 of MAXIM company to carry out level conversion, it comprises that driver and two that two TTL input converts RS232 output to receive the RS232 input and they are translated into cmos compatible output receiver.These receivers and driver are with these signals reverse; Its inner supply voltage transmitter in addition; Can the input+the 5V power conversion become the RS-232C output level required ± 10V voltage, single+5V power supply just can have been realized so adopt the serial communication system of this chip interface to need only.
Ultrasonic emitting and receiving circuit: native system adopts the main control chip of LM1812 as ultrasonic emitting and receiving circuit.When detecting the ultrasonic echo signal, 14 pin of LM1812 (linking to each other with certain external interrupt mouth of single-chip microcomputer) become low level, make the T0/T1 counter of single-chip microcomputer stop counting.So just measure ultrasound wave and come and gone the needed time, thereby can obtain testing distance.Waveform with observed transmitted wave of oscillograph and 14 pin is shown in Figure 2.As can be seen from the figure, 14 pin signals, wait when receiving echoed signal with this timer time to start with in the hyperacoustic negative pulse simultaneously of emission, the 14 pin undersuing that can have another one.Can see the mistiming between these two negative pulses intuitively through Fig. 2, Here it is, and our ultrasound wave that records comes and goes the needed time.
In order to guarantee the reliability of system, native system adopts four tunnel ultrasonic emitting to work simultaneously with accepting.The transmitting terminal (8 pin of LM1812) of controlling four road ultrasonic signals links together, and connects certain I/O mouth of single-chip microcomputer, and 14 pin of four road LM1812 link to each other with four external interrupt mouths of SST89E58RD2 respectively.After a certain road ultrasonic sensor receives the ultrasonic echo signal; 14 pin of corresponding LM1812 become low level; Can be from the interruption subroutine of correspondence in the hope of this road hyperacoustic two-way time, thus can be in the hope of the distance between this road ultrasonic sensor and the barrier.Distance measurement value to four tunnel ultrasonic circuit compares, and get minimum value and on LCD, show, can be that the distance that records of which ultrasonic sensor is the shortest simultaneously through judgement, confirm the general orientation of barrier, and show in real time through LCD.
The LCD display circuit: native system adopts OCMJ4 * 8C (128 * 64) LCD MODULE of electronics corporation of Jinpeng to design the LCD display circuit.The serial ports working method that OCMJ4 * 8C (128 * 64) LCD MODULE adopts, it can show the four lines content, can satisfy the display requirement of reverse radar system design.It only need with the RS (CS) of LCD MODULE, R/W (STD), E (SCLK), PSB ,/ five I/O mouths that RST connects single-chip microcomputer respectively get final product, and so just can operate the work of controlling LCD MODULE through the I/O mouth to single-chip microcomputer.
System's master routine software design: in fact the design process of master routine is comprising process, function division and the process of refinement thereof of software plan, the process of program run mode type selecting, and the process of system resource allocation.Following design philosophy is the main principle that native system makes up master routine.
(1), system adopts external clock: 12MHz.
(2), fixedly show below content in the LCD display routine:
Backing distance cm
The outer temperature of car ℃
Vehicle interior temperature ℃
The barrier position:
(3), backing distance is accurate to 0.1cm; The car internal and external temperature is accurate to 0.1 ℃; A barrier position display the first from left/the second from left/left side a three/left side four is represented barrier some near in No. four ultrasonic sensors respectively.
(4), the every 2s in backing distance, temperature value and corresponding barrier position shows once.
(5), the realization of segmentation audio alert function is to carry out the different voice prompting according to the distance of distance.
Native system has disposed four tunnel ultrasonic ranging circuit, and Single-chip Controlling four tunnel ultrasonic circuit are found range respectively, and four tunnel echoed signals connect four middle fractures of SST89E59RD2 respectively and handle echoed signal.Get minimum value after the distance value that four drive tests are got compares and promptly be the backing distance of safety, also can from any road ultrasonic circuit judge the approximate location of barrier simultaneously according to this minimum value.Relevant information is shown on LCD, simultaneously according to carrying out the segmentation audio alert apart from distance.
Claims (2)
1. ultrasound wave reversing radar of vehicle system; This system is made up of several parts such as single chip machine controlling circuit, ultrasonic emitting and receiving circuit, temperature-compensation circuit, LCD display circuit and voice alarm circuit; It is characterized in that: single-chip microcomputer picks up counting in ultrasonic signal emission, and ultrasonic signal is propagated in air, launches after running into barrier; The external interrupt mouth that the echoed signal of reflection is input to single-chip microcomputer after treatment produces interruption, and single-chip microcomputer stops timing.Can obtain ultrasonic signal through single-chip microcomputer and come and go the needed time, combine the velocity of sound after the temperature compensation can try to achieve the distance between car body and the barrier again.
2. described based on hyperacoustic new automobile reverse radar system according to claims 1; It is characterized in that: this system configuration four tunnel ultrasonic circuit; Guarantee that four road ultrasonic signals launch simultaneously; Receive echoed signal after treatment with four middle fractures respectively, thereby measure four road backing distances respectively.What backing distance showed is the minimum value in four road distance measurement values, minimum through the distance measurement value of differentiating which road ultrasonic circuit in four tunnel ultrasonic circuit simultaneously, thereby learns the approximate location of barrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105208826A CN102455424A (en) | 2010-10-27 | 2010-10-27 | Ultrasonic automobile reversing radar system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105208826A CN102455424A (en) | 2010-10-27 | 2010-10-27 | Ultrasonic automobile reversing radar system |
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| Publication Number | Publication Date |
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| CN102455424A true CN102455424A (en) | 2012-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010105208826A Pending CN102455424A (en) | 2010-10-27 | 2010-10-27 | Ultrasonic automobile reversing radar system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454642A (en) * | 2013-09-05 | 2013-12-18 | 天津理工大学 | Short-distance ultrasonic wave distance measuring system based on single chip microcomputer |
| CN104656083A (en) * | 2015-02-12 | 2015-05-27 | 无锡市崇安区科技创业服务中心 | Ultrasonic distance measuring system having temperature compensation function and adopting pulse counting |
| CN104656088A (en) * | 2015-02-12 | 2015-05-27 | 无锡市崇安区科技创业服务中心 | Ultrasonic automobile anti-collision system having temperature compensation function and adopting pulse counting |
| CN105204028A (en) * | 2015-10-16 | 2015-12-30 | 清华大学苏州汽车研究院（吴江） | Car-backing auxiliary hardware-in-loop development system based on ultrasonic transducers |
| CN105242276A (en) * | 2015-09-15 | 2016-01-13 | 清华大学苏州汽车研究院（吴江） | Ultrasonic sensor-based parking assisting system |
-
2010
- 2010-10-27 CN CN2010105208826A patent/CN102455424A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454642A (en) * | 2013-09-05 | 2013-12-18 | 天津理工大学 | Short-distance ultrasonic wave distance measuring system based on single chip microcomputer |
| CN104656083A (en) * | 2015-02-12 | 2015-05-27 | 无锡市崇安区科技创业服务中心 | Ultrasonic distance measuring system having temperature compensation function and adopting pulse counting |
| CN104656088A (en) * | 2015-02-12 | 2015-05-27 | 无锡市崇安区科技创业服务中心 | Ultrasonic automobile anti-collision system having temperature compensation function and adopting pulse counting |
| CN105242276A (en) * | 2015-09-15 | 2016-01-13 | 清华大学苏州汽车研究院（吴江） | Ultrasonic sensor-based parking assisting system |
| CN105204028A (en) * | 2015-10-16 | 2015-12-30 | 清华大学苏州汽车研究院（吴江） | Car-backing auxiliary hardware-in-loop development system based on ultrasonic transducers |
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Application publication date: 20120516 |