完整word版出租车计费器外文翻译中英对照.docx

1、完整word版出租车计费器外文翻译中英对照Based on monolithic integrated circuits multi-purpose rental car mileage fare meters designAbstract: Introduced that one kind take monolithic integrated circuit A T89S52 as the core multi-purpose rental car mileage fare meters design, elaborates in the software and hardware desi

2、gn process key technologies processing. The simulation result indicated that this mileage fare meter has the collection idea regulation, the time, the cost, the memory, the examination, the statistics and so on many kinds of measurement functions, and has the overspeed reminder, to prevent the drive

3、r to cheat, the pronunciation, the printing and the demonstration and so on many kinds of functions. Compares with the existing system, this system has the overspeed reminder and so on a stronger function.1 introduction 1 introduction the rental car mileage fare meter is the rental car transport bus

4、iness charge special-purpose intellectualized measuring appliance, along with electronic technologys development, the rental car mileage fare meter technology unceasingly is also progressing and enhances. The domestic rental car mileage fare meter had already experienced 4 stage development. From th

5、e tradition completely the mechanical type which is composed of the mechanical primary device, namely replaces the part mechanical primary devices rental car mileage fare meter to half electronic formula with the electronic circuit; Again from integrated circuit type to present monolithic integrated

6、 circuit system design rental car mileage fare meter. The rental car mileage fare meter cost is whether accurate, the taxi driver whether overspeed is the passenger most issue of concern, but mileage fare meter transport business data management whether facilitates is the taxi driver most pays atten

7、tion. How therefore to design one kind both to be able to prevent the driver to cheat effectively with overspeed and can facilitate drivers mileage fare meter especially important. Therefore, this article as the core designs a model of multi-purpose rental car mileage fare meter take monolithic inte

8、grated circuit A T89S52, this mileage fare meter can realize the course valuation and the demonstration, the data storage and the inquiry, the clock demonstrated that the overspeed reminder, the pronunciation disseminate news with functions and so on bill printing. It is more convenient than the mar

9、ket in some mileage fare meter use, function entire, but also has prevents the driver to cheat effectively with the system stability good merit. In which overspeed reminder function may remind the driver and the passenger, warned that the driver do not want to exceed the speed limit, avoids traffic

10、accidents occurrence.2 System hardware structure and function characteristic2. 1 Overall planOverall plan design block diagram as shown in Figure 1, the overall system by monolithic integrated circuit The T89S52 control circuit, A44E Hall sensor electric circuit The T24C02 storage circuit, the DS130

11、2 clock circuit, the ISD2560 pronunciation disseminates news the electric circuit, the bill marking circuit, the pressed key alignment circuit, the MAX7219 actuation display circuit and the power circuit is composed. The monolithic integrated circuit gathers and judges the spatial headlight signal a

12、nd the distance examination sensor signal, when the rental car starts, the monolithic integrated circuit examines the Hall sensors signal impulse and carries on the course computation. When does not have the passenger, the monolithic integrated circuit transfers the real-time time chip DS1302 proced

13、ure and the MAX7219 serial port demonstration driver, carries on the clock demonstration with 4 L ED; The headlight breaks off when in the sky passenger loading: The ISD2560 pronunciation disseminates news the electric circuit to carry on the pronunciation to disseminate news 1 (welcome passenger to

14、 ride this rental car), through the DS1302 gain time information resolution daytime/the evening, then transfers The T24C02 procedure gain daytime/evenings unit price and the outset price, then starts information and so on valuation and tell time, course and amount; The headlight gets the passenger t

15、o get out in the sky time: Carries on disseminates news 2 (thanks rides this rental car once more, please hand over amount), and prints the good bill, the monolithic integrated circuit saves transport business data message to 24C02, waited for after the rental car starts once more, single informatio

16、n reset replacements and so on amount and course, complete a valuation in light of this.2. 2 Hardware circuit designBy the power unit, the Hall sensor distance survey part, the data demonstrated that the part, the clock part, the pronunciation disseminate news the part, the bill printing part and th

17、e data storage part and so on compose, various part of ports are separately connected with the monolithic integrated circuit AT89S52 outlet, realizes mileage fare meters function through monolithic integrated circuits control to realize.2. 2. 1 Power unitBecause mileage fare meters working condition

18、s are quite bad, it requests to have the anti-vibration, the anti-high low temperature, anti-moist, abilities and so on anti-electromagnetic interference, when specially the power source aspects disturbance, like the rental car starts, the engine flame, the storage battery charge and so on create in

19、put the mileage fare meter + 12 V power sources not to be unstable. Therefore uses + 12 V storage battery power sources after the filter and the power source constant voltage management chip 7805 obtains + 5 V regulated voltage outputs, the guarantee overall system can the normal work.2. 2. 2 Distan

20、ce survey partIn the rental car needs one to be able to obtain the wheel rotation is the distance measurement signal installment accurately, by obtains the standard signal impulse to send in the monolithic integrated circuit fixed time/counter T1 is P3. 5 pins, completes 100 time after monolithic in

21、tegrated circuits T1 tally function counting have an interrupt to complete the distance the survey. (supposes wheel perimeter is 1 m, then the Hall sensor produces 100 the pulse then to express that every time vehicle traveling schedule 0. 1 km, has carried on establishment according to actual situa

22、tion in procedure). The automobile shaft coupling according to the circle spacing inserting magnet steel, with Hall the sensor integration chip A44E examination and the output pulse, Hall sensor integration chip A44E has functions and so on signal conversion, voltage amplification, reshaping output,

23、 to increase its antijamming ability, passes through 74L S14 after the signal shaping the transmitted light occasionally sends in P3 again. 5 pins. But in this electric circuit to prevent the driver to make the shortcoming, may use the encryption sensors method, first counter impulse encryption whic

24、h gathers to the Hall sensor, causes the cost pulse by the scrambled text way transmission, finally the decipher is the definite orders pulse, transmits to the mileage fare meter cost. In password sensor, what the encryption transmits to the decoder is the password, when the encryption and the decip

25、her inherent password is the same, decoder only then to mileage fare meter transmission counter impulse, mileage fare meter only then cost, therefore, the password sensor enhanced the mileage fare meter cost reliability, the illegal taxi driver is also unable to make the fare to increase, simultaneo

26、usly the driver cannot replace the mileage fare meter sensor secretly, realized the mileage fare meter to unify the installment, the service and the annual inspection global administration by the National Measurement Department.2. 2. 3 The data demonstrated the part, because the design requirements

27、have the unit price (2), the midway standby period (2), the distance (4), the amount (4) to demonstrate that the clock (4) output, if uses LCD liquid crystal display, in is away from outside screen 1 m to be unable to see clearly the data, moreover cannot satisfy the request in daytime its contrast

28、gradient, therefore uses 16 high luminance L the ED nixietube demonstration. When is the spatial vehicle hour, for the electricity saving, only the tell time, is for the driver examined that the time provides the convenience, when the driver wants to inquire the former transport business data, press

29、es inquires the key to be possible to provide the demonstration; When passenger demonstrates transport business the unit price, the standby period, the distance, the amount and the clock. Demonstrated that driver MAX7219 has the serial input/parallel output function, most may demonstrate that 8 L th

30、e ED nixietube, simultaneously has may to brightness, the decoding way, the demonstration figure, the working pattern carry on the programming, very satisfied long-distance range data demonstration; MAX7219 selects the serial addressing method, enters the DIN end 16 serial bit data, in each CL K ris

31、e along is moved to the internal 16 shift register, in the LOAD ends rise along is locked saves to controls in the register and the data register, receives first is highest order D15, uses 89S52 in this electric circuit P1. 5 are the data mouth, P1. 6 are the LOAD end, P1. 7 last bell end. Because m

32、ust demonstrate 16 L ED, therefore uses 2 piece of MAX7219 level company to carry on the actuation to demonstrate, previous piece of data outlet and next piece of data input port connection use. But on main circuit board TA89S52 output DIN, LOAD, CL K signal will transmit in display panels process p

33、ossibly as a result to disturb has the distortion, will therefore carry on the reshaping then again transmitted light partner on the display panel circuit wafer to these 3 signals, will prevent the phenomenon occurrence which the data wrong the demonstration or did not demonstrate.2. 2. 4 Clock partThe mileage fare meter when the