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1、<p><b> UNIT ONE：</b></p><p> The automobile speech sound system of the computer control </p><p> 1.Forewords </p><p> In the last few years, the highway traff
2、ic caused development of our country very rapidly, has raised the vehicle traversal speed and circulation density greatly ,especially the appearance of highway has followed to come to traffic accident ,and also occ
3、urred again and again, at the same time ,caused personal casualties and economic property loss. How to reduce traffic accident have become urgent matters. Driver of carefullessness is the one of important reason that tr
4、affic accident occu</p><p> Driver of carefullessness is the one of important reason that traffic accident occurs , therefore develop a set of simple reliable, can each partial conditions of automatic detec
5、tion vehicle, discover unusual condition the safe system that can send the hint of speech sound in time to driver have great actual meaning.</p><p> 2.Systems design ideological </p><p> basis
6、ed to initiate the common factor of accident, this set of system will realize following detection function: </p><p> ?。? closing door , detecting whether the gate lock has beenn deducted; </p><p
7、> ?。? detecting the cooling water of engine warm up; </p><p> ?。? detecting the oil quantity of engine machine; </p><p> ?。? detecting the braking oil quantity; </p><p> ?。? whe
8、n automobile backs a car , detecting the barrier condition after the automobile; </p><p> ?。? the wear out condition of detection automobile brake friction flat; </p><p> ?。? Detecting the condi
9、tion of road surface; </p><p> ?。? Detecting whether driver is excessive drinking. </p><p> After automobile engine starts , system begins detecting, when discovering unusual condition, such as
10、 door do not close , the warm error of cooling water is the hint of speech sound high , oil quantity is below and backing a car ,the barrier is near next to the automobile , friction flat excessively wear and the coeff
11、icient of friction of road surface .the alcohol content in the little air of driver's cab error higher and so on, starting system send the hint of speech sound. </p><p> In the system of speech sound a
12、dopting the Ｔ6668 chip record systems of speech synthesis and the regenerative signal of speech sound. According to needs ,in the control of ＣＰＵ, ask to be able to export the following hint speech sounds:</p>&l
13、t;p> ａ. noticing door do not close; </p><p> ?。? Noticing the temperature exceed; </p><p> ｃ. the oil quantity of machine oil is below; </p><p> ?。? brake oil quantity is belo
14、w; </p><p> ?。? care left rear obstacle; </p><p> ｆ. care right rear obstacle;</p><p> ?。? Braking ineffectiveness is danger; </p><p> ｈ. noticing the road surface th
15、an slippery; </p><p> ｊ. wine rear driving danger. </p><p> In the entire design, being economy , simple, reliable to popularize.</p><p> 3.Systematic hardwares </p><p
16、> To complete the above-mentioned every detection and the export requirement of speech sound, this system adopts the hardware structure that shows as Fig.1.</p><p> 圖1 硬件結(jié)構(gòu)圖</p><p> Ele
17、ctronic controlling machine adopts the 8031 single chip machine and the corresponding digital circuit, by it, gather the signal of each sensor , decide and control the synthetic output of speech sound as a result accordi
18、ng to handling and calculation. Because of the 8031 single chip machine without ＲＯＭ, expand a slice of ＥＰＲＯＭ 2764 is as the program memory.</p><p> The system of speech sound with Japanese Dong Zhi company&
19、#39;s production Ｔ6668 chips of speech synthesis is core, additionally adopting again a slice of ＥＰＲＯＭ 27,256 stock record the data of speech sound of good system in advance, managing the data in which is using 8031 , ac
20、cording to the various faults to take the adjust, make up , from the Ｔ6668 output. In this design the Ｔ6668 adopts the ＣＰＵ operating pattern and the 8031 connections ,which instruction is written in by the Ｔ6668 ＣＰＵ in
21、terfac</p><p> In this design, it is for door , backing a car detection adopted the ＯＲＤ 226 dry spring flat switch sensors. The spring flat switch sensor is a kind of magnetic drive type switch, which sp
22、ort partial qualities are little ,and rapid that natural frequency respond speed high and service life grows , even if in the place in which automobile and trolleybus often have vibration , using fully , especially be us
23、ed in being the sensor with the monitor of relevant automobile extensively part. </p><p> For the engine machine oil the detection of oil quantity and braking oil quantity adopt ＣＥ 4-1 - 5 type floats -
24、spring flat liquid position sensor. </p><p> Measuring the temperature of cooling fluid to use thermistor type liquid use temperature sensor.</p><p> With the negative thermistor NTC of tempe
25、rature coefficient, its temperature value and simulated voltage signal become inverse ratio. Imitate voltage signal to go through condenser strain the INO simulated signal passageway that sent into ADC0 809 after wave. &
26、lt;/p><p> When engine preheats , engine water is warm to be 70 to take to show degree, in the data memory in single flat machine, stocking data is compared , after contrast report to alarm the circuit silent
27、light report to the police. Along with the work of unceasing engine, the water warm beginning of engine goes up gradually, when water is warm to exceed 95 to take to show degree only flat microcomputer drive report to al
28、arm circuit report to alarm. Reminding the cooling system of driver notice engine </p><p> The weared out condition of the detection automobile braking friction flat uses the wear detection sensor. When ins
29、talling maked friction flat sensor Ｕ the top of word shape the wear limit location that locates in brake brake pad on, when friction flat wear goes to assigned limit Ｕ word shape part have been ground to break, circuit b
30、reak open. At the same time, this unusual signal will be sent into the single flat microcomputer. </p><p> For the detection driver, whether drink choose the semiconductor gas sensor that applies to ethano
31、l gas detection , when the alcohol content in the air of driver's cab reaches certain density, sends a alarm signal to the single chip microcomputer.</p><p> When automobile back a car , system uses th
32、e barrier of supersonic detection vehicle rear. The rear bumper two ends of automobile pack to set up supersonic project/receiver, two project/receiver with the way of equal time, project/in proper order to take
33、over supersonic , is circulating to go on again and again. Because of this cycle time is from </p><p> ?。茫校?control, therefore this system will not get the wrong signal influence from external sound wave. Au
34、tomobile distance the distance of barrier is pass through sonar send reflection return the time that this route spends come to survey and calculate , calculation has following type.</p><p><b> ?。?1/2*c
35、t</b></p><p> ｃ=331+0.6θ</p><p> In type ｄ — — — automobile far from the distance of barrier </p><p> ?。?— — — supersonic the speed that propagated in air </p><p
36、> ?。?— — — the time of mensuration </p><p> θ — — — vehicle outside air temperature </p><p> Angle sonar the barrier that can be measured approximate in 50ｃｍ scope within, pawn barrier dist
37、ance automobile do not go to 50ｃｍ , send speech sound to report to alarm.</p><p> On the road surface that the moist of rainy day or ice snow covers , between road surface and wheel tyre, coefficient of fri
38、ction is little , vehicle is all right with high speed or sudden braking makes automobile overturn easily, which knows vehicle course Central Africa, is frequently dangerous. Therefore in this system spoil frequently so
39、me point using driver in the course of traveling to move brake movement, detection tyre and the slip rate of road surface ( racial of drive wheel and the ba</p><p> 4.Systematic softwares </p><p&
40、gt; The main program block diagram shows as Fig.2. The subprogram of speech sound shows as Fig.3. </p><p> After system starts eclectricity , main program first complete initialization work includes settin
41、g up storehouse indicator , sets initial value and the working way of timer/counter, put relevant storage element initial value, start timer/counter open suspend and so on. Then shiping inquire each state input line, l
42、ooking over whether needs report to alarm. For instance, when sensor detection going to automobile is backing a car,ＣＰＵ choose want trigger project address, then, starting to project</p><p> In design using
43、 the timer of 8031 Ｔ0 reckon by time , in week