CN2142586Y - Four-channel display taxi charge indicator - Google Patents

Abstract

The utility model relates to a taxi charge indicator with a four-channel display. The utility model is characterized in that anti-jamming circuits are respectively arranged among lamps, a sensor, a power supply and an SCM, and the anti-jamming ability of a taximeter is increased. A displayer can display unit price, mileage, equitime and price simultaneously in order to prevent cheat behavior. The displayer and the power supply are both added with protective devices in order to extends the service life of the taximeter. An automatic charge spare power supply is an SCM stand-by power supply with good power down protecting effect and is profitable for data preservation, and meanwhile, the utility model provides a reliable technical assurance to social surveillance of the taximeters.

Description

Four-channel display taxi charge indicator

The utility model relates to a kind of four and shows taximeter, belongs to automobile-used gauging instrument.

The present fee register that uses of taxi, single, double demonstration all can be practised fraud for two kinds, and poor anti jamming capability, and mistake is many, and the life-span is short, and three fee register mileages that show and a shared window when waiting still have the chance of cheating.

The purpose of this utility model be to provide a kind of have four show (unit price, mileage, etc. the time, the amount of money) function, anti-cheating and calculate accurately, the taximeter of long service life.

Of the present utility model four show that taximeters comprise empty car lamp, sensor, single-chip microcomputer, control circuit, display, program storage, power supply, shell and panel, it is characterized in that being connected to the anti-jamming circuit of being made up of LC filtering circuit and photoelectric isolating circuit between the I/O chip input end of the mechanical linkage switch of described empty car lamp and single-chip microcomputer; Be connected to anti-jamming circuit between described sensor output terminal and the single-chip microcomputer counting end by photoelectricity is isolated and the RC filtering circuit is formed; Described power input is connected to the anti-jamming circuit of being made up of forward diode and LC filtering circuit; Described display has four groups of digital demonstrations, and its segment decoder and bit decoder all have protector; The standby power of described single-chip microcomputer adopts automatic charge power supply.

The utility model has the advantages that four kinds of data (unit price, mileage, etc. the time, the amount of money) show that simultaneously the passenger comes into plain view, thereby prevent that the car owner from practising fraud; Anti-jamming circuit is adopted in many places, has high anti-interfering performance, and fee register can both reliably inerrably be worked under any vehicle condition; No matter fee register is in any duty, no matter when, when the automobile power source power down, standby power supply makes the equal energy of the computational data of single-chip microcomputer intact; The use of section, position protector has prolonged fee register serviceable life, and the social supervision to taxi simultaneously provides the reliable technique assurance.

Fig. 1 is a principle of work block scheme of the present utility model.

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment: referring to Fig. 1,2, of the present utility model four show that taximeter comprises by pilot lamp DL ₁With the mechanical linkage K switch _1-1, K _1-2The empty car lamp of forming is by the magnet steel and the Hall element IC that are contained on the mechanical flexible axle ₄(UGN3119) sensor of Zu Chenging, single-chip microcomputer IC ₁(80039), by interface chip (8243), switches set K _2-21, driving circuit IC ₇(74LS386), state shows light emitting diode D ₉-D ₁₄The control circuit of forming 9 is by segment decoder IC ₂(CD4513 or CD4511), bit decoder IC ₃(74LS154 or CD4515), segment protect device 2, the display 1 that position protector 7 and charactron group 3,4,5,6 are formed is by latch IC ₆(74LS373) and the program storage 11 formed of EPROM chip, stabilized voltage supply 12 and shell and panel.Linked switch K at empty car lamp _1-1With single-chip microcomputer IC ₁I/O chip (8243) between be connected to by LC filtering circuit and photoelectric isolating device IC ₈The anti-jamming circuit of forming 8, but its filtering exchanges undesired signal by the broadband that empty car lamp seals in.Hall element IC at sensor ₄With single-chip microcomputer IC ₁T ₁Between the end, be connected to by photoelectricity and isolate IC ₅The single T network of (TIL117 or TIL113), RC and ∏ type network and not gate F ₁The anti-jamming circuit of forming 14, R ₂, R ₃, R ₄Single T network is as photoelectric isolating device IC ₅Load, C ₁, R ₅, C ₂Constitute ∏ type network, sensor Hall element IC ₄The firing pulse undesired signal that the motor car engine flexible axle that accompanies in the output passes over is through photoelectric isolating device IC ₅Illuminating circuit ground connection, IC ₅Output no longer include high-frequency pulse signal, IC ₅The spike of output itself disturbs elder generation through single T network dividing potential drop, the more level and smooth and not gate F through ∏ type network ₁Single-chip microcomputer IC is sent in shaping at last ₁And T ₁End.The resistance-capacitance network of anti-jamming circuit 14 also can be selected twin-T network or simple R C filtering circuit for use.Between fee register power supply 12 input ends and automobile 12V power supply, be connected to by C ₃, C ₄, L ₁, C ₅, C ₆The LC ∏ type network and the forward connection diode D that form ₁The protection anti-jamming circuit of forming 13, the undesired signal that automobile 12V power supply seals in is through D ₁Cut negative half period, again through the positive half cycle of ∏ type network elimination, D ₁Also rise and prevent that power supply from meeting anti-damage voltage stabilizer W ₁Effect, the segment decoder IC of display 1 ₂Output terminal is connected to by positive temperature coefficient resistor R ₁₀-R ₁₆The segment protect device of forming 2, pressure drop increases with showing the charactron ABSORPTION CURRENT to become big for it, thereby has protected IC ₂And IC ₁, bit decoder IC ₃Output terminal is connected to PNP triode (3CGT33 or 8550) G ₁-G ₁₄The position protector of forming 7 prevents bit decoder IC ₃Overload is damaged.Improve the brightness that shows charactron simultaneously.The stand-by power supply 10 of single-chip microcomputer is by rechargeable battery E ₁And charging diode D ₄, current-limiting resistance R ₉Form, during automobile 12V power supply operate as normal, through voltage stabilizer W ₁5V is through D in output ₃For single-chip microcomputer IC ₁Standby power end V _DP, simultaneously through D ₄To battery E ₁Charging, voltage reduces at 0 o'clock, diode D in case automobile 12V power supply breaks down ₃, D ₄End battery E ₁To single-chip microcomputer IC ₁Standby power end V _DDPower supply makes single-chip microcomputer IC ₁Computational data intact, and realize that data preserve for a long time.The overvoltage crowbar of power supply 12 is by W ₂, C ₈Form, as voltage stabilizer W ₁When unusual output occurring above 7V, W ₂Puncture is not damaged with circuit in the protection fee register.The fee register panel adopts and to touch keyboard, prevents to advance in the machine dirt, and button serviceable life is above 100,000 times.

Claims (3)

1, a kind of four show taximeter, comprise empty car lamp, sensor, single-chip microcomputer, control circuit 9, display 1, program storage 11, power supply 12 and shell and panel, it is characterized in that described empty car lamp mechanical linkage switch and single-chip microcomputer IC ₁The I/O interface chip between be connected to the anti-jamming circuit of forming by LC filtering circuit and photoelectric isolating circuit 8; Described sensor output terminal and single-chip microcomputer IC ₁T ₁Be connected to anti-jamming circuit 14 between the end by photoelectricity is isolated and the RC filtering circuit is formed; Described power supply 12 input ends are connected to the anti-jamming circuit of being made up of forward diode and LC filtering circuit 13; Described display 1 has four groups of digital demonstrations, its segment decoder IC ₂Output terminal be connected to the segment protect device 2 that constitutes by positive temperature coefficient resistor, its position decoding IC ₃Output be connected to by large power triode form the position protector 7, described single-chip microcomputer IC ₁When power down, adopt the standby power supply 10 that charges automatically to do standby power.

2, according to claim 1 four show taximeter, it is characterized in that described power supply 12 is added with the overvoltage crowbar of being made up of voltage stabilizer and electric capacity.

3, according to claim 1 four show taximeters, it is characterized in that described panel adopts to touch keyboard.

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