1、1 UNIT ONE： The automobile speech sound system of the computer control 1.Forewords In the last few years, the highway traffic 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 c
2、ome to traffic accident ,and also occurred 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 traffic accident occurs , therefore developing
3、 a set of simple reliable, can each partial conditions of automatic detection vehicle, discover unusual condition the safe system that can send the hint of speech sound in time to driver have great actual meaning. Driver of carefullessness is the one of important reason that traffic accident occurs
4、, therefore develop a set of simple reliable, can each partial conditions of automatic detection vehicle, discover unusual condition the safe system that can send the hint of speech sound in time to driver have great actual meaning. 2.Systems design ideological basised to initiate the common factor
5、of accident, this set of system will realize following detection function: . closing door , detecting whether the gate lock has beenn deducted； . detecting the cooling water of engine warm up； . detecting the oil quantity of engine machine； . detecting the braking oil quantity； . when automobile bac
6、ks a car , detecting the barrier condition after the automobile； . the wear out condition of detection automobile brake friction flat； . Detecting the condition of road surface； . Detecting whether driver is excessive drinking. After automobile engine starts , system begins detecting, when discoveri
7、ng unusual condition, such as 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 coefficient of friction of road surface .the alcohol conte
8、nt in the little air of drivers cab error higher and so on, starting system send the hint of speech sound. In the system of speech sound adopting the 6668 chip record systems of speech synthesis and the regenerative signal of speech sound. According to needs ,in the control of , ask to be able to ex
9、port the following hint speech sounds: . noticing door do not close； . Noticing the temperature exceed； . the oil quantity of machine oil is below； . brake oil quantity is below； . care left rear obstacle； 2 . care right rear obstacle； . Braking ineffectiveness is danger； . noticing the road surface
10、 than slippery； . wine rear driving danger. In the entire design, being economy , simple, reliable to popularize. 3.Systematic hardwares 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. 图 1 硬件结构
11、图 Electronic 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 according to handling and calculation. Because of the 8031 single chip machine wit
12、hout , expand a slice of 2764 is as the program memory. The system of speech sound with Japanese Dong Zhi companys production 6668 chips of speech synthesis is core, additionally adopting again a slice of 27,256 stock record the data of speech sound of good system in advance, managing the data in wh
13、ich is using 8031 , according to the various faults to take the adjust, make up , from the 6668 output. In this design the 6668 adopts the operating pattern and the 8031 connections ,which instruction is written in by the 6668 interface. The 6668 1 end and data input end 、 end difference and 74 165
14、( 8 and/string shift register ) end 、 end are linked , so with only of the data of 27,256 by the data bus line send into 74 165 the output of speech sound that gets composition. In this design, it is for door , backing a car detection adopted the 226 dry spring flat switch sensors. The spring flat s
15、witch sensor is a kind of magnetic drive type switch, which sport 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 used in being the se
16、nsor with the monitor of relevant automobile extensively part. For the engine machine oil the detection of oil quantity and braking oil quantity adopt 4-1 - 5 type floats - spring flat liquid position sensor. Measuring the temperature of cooling fluid to use thermistor type liquid use temperature se
17、nsor. With the negative thermistor NTC of temperature 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. When engine preheats , engine wate
18、r 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 light report to the police. Along with the work of unceasing engine, the water warm beginning of engine goes up gradually, when water is
19、 warm to exceed 95 to take to show degree only flat microcomputer drive report to alarm circuit report to alarm. Reminding the cooling system of driver notice engine the 传感器 程序存储器 电子控制器 语言数据存储器 语音合成电路 3 change of temperature. The weared out condition of the detection automobile braking friction flat
20、 uses the wear detection sensor. When installing maked friction flat sensor the top of word shape the wear limit location that locates in brake brake pad on, when friction flat wear goes to assigned limit word shape part have been ground to break, circuit break open. At the same time, this unusual s
21、ignal will be sent into the single flat microcomputer. For the detection driver, whether drink choose the semiconductor gas sensor that applies to ethanol gas detection , when the alcohol content in the air of drivers cab reaches certain density, sends a alarm signal to the single chip microcomputer
22、. When automobile back a car , system uses the 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 over supersonic , is circulating to go on a
23、gain and again. Because of this cycle time is from control, therefore this system will not get the wrong signal influence from external sound wave. Automobile distance the distance of barrier is pass through sonar send reflection return the time that this route spends come to survey and calculate ,
24、calculation has following type. =1/2*ct =331+0.6 In type automobile far from the distance of barrier supersonic the speed that propagated in air the time of mensuration vehicle outside air temperature Angle sonar the barrier that can be measured approximate in 50 scope within, pawn barrier distance
25、automobile do not go to 50 , send speech sound to report to alarm. On the road surface that the moist of rainy day or ice snow covers , between road surface and wheel tyre, coefficient of friction is little , vehicle is all right with high speed or sudden braking makes automobile overturn easily, wh
26、ich knows vehicle course Central Africa, is frequently dangerous. Therefore in this system spoil frequently some 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 bad speed of rotational speed of und
27、rive wheel of drive wheel), and the accordingly estimation condition of road surface. And beg the specific practice of slip rate is the sensor of rotational speed of edd current installation in drive with undrive wheel on, measure the difference of rotational speed , so making slip rate finally in order to remind that driver
