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CN203216500U - High-precision analog mileage signal generator - Google Patents

High-precision analog mileage signal generator Download PDF

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Publication number
CN203216500U
CN203216500U CN 201320259593 CN201320259593U CN203216500U CN 203216500 U CN203216500 U CN 203216500U CN 201320259593 CN201320259593 CN 201320259593 CN 201320259593 U CN201320259593 U CN 201320259593U CN 203216500 U CN203216500 U CN 203216500U
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mileage
button
chip microcomputer
measuring
output
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Inventor
章俊华
朱理
李明贵
龚洪宾
王珂
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GUIZHOU MACHINERY ELECTRONIC PRODUCTS QUALITY SUPERVISION AND INSPECTION INSTITUTE
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GUIZHOU MACHINERY ELECTRONIC PRODUCTS QUALITY SUPERVISION AND INSPECTION INSTITUTE
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Abstract

The utility model provides a high-precision analog mileage signal generator. A circuit board, which is composed of a setting button (1-1), a measuring button (1-2), a crystal oscillator (1-3), an input circuit (1-4), a microcontroller (1-5), a display (1-6), an output circuit (1-7), an output terminal 1# (1-8), an output terminal 2# (1-9), a 220V mains supply (1-10), a power switch (1-11), a power filter (1-12), a +5V switching power supply (1-13) and a +12V switching circuit (1-14), is fixed in a generator shell A. The panel and back board of the shell A are provided with corresponding wiring terminals and control buttons. By the aid of analog sent pulse signals, accuracy of a mileage instrument can be measured efficiently, and the accuracy is increased at 0.05%; the high-precision analog mileage signal generator is simple in structure, safe and convenient to operate and good in measuring repeatability, drifting is avoided during long-term use, and special requirements on measurement environment and place are omitted.

Description

High-precision analog mileage signal generator
Affiliated technical field
The utility model relates to the device of a kind of measuring vehicle mileage gauge accuracy, tool Body relates to a kind of high-precision analog mileage signal generator.
Background technology
At present, the measuring method of known vehicle mileage instrument accuracy grade has road test method and indoor to drive two kinds of test method(s)s.Road test method is the regulation according to GB/T 12548-1990 " autometasomatism, mileometer check calibration steps ", the mileage instrument is loaded on the test car, running test on the test roads of regulation, measure the actual range that vehicle travels, the difference of the distance that shows with the mileage instrument is the error of indication of mileage instrument, thereby obtains the mileage instrument accuracy grade.This method is because accuracy, the acceleration and deceleration when test vehicle travels of temperature, the test roads gradient, dimensional measuring instrument in the tire of test vehicle, influence such as skid, cause the mileage Measurement Uncertainty bigger, the repeatability of measurement, repdocutbility are all relatively poor.Indoor the method for driving is the method for checking correcting mechanism mainly to adopt at present, use car test bench to carry out the simulated roadway running test, the mileage instrument is carried out the error of indication to be measured, what its measuring accuracy was best also can only reach 0.5%, and need special test site, because existing the vehicle accident to go out testing table when running at high speed, simulation potential safety hazard such as drives, though this method can be avoided test vehicle and test roads in the road test method, the uncertainty of measurement component that survey instrument brings, but the uncertainty of measurement of acceleration and deceleration and test-bed self is still bigger, the measuring accuracy of hometown gift of money for a friend going on a journey device accuracy is difficult to improve, and can not satisfy the check calibration requirements to high precision (being better than 0.5%) mileage instrument product.
At present, also have a kind of easy mileage signal generator on the market, formed by integrated circuit and capacitance-resistance resolution element etc., can check qualitatively whether the mileage instrument has fault, can not measure the accuracy of mileage instrument.
Summary of the invention
The measuring accuracy that existing mileage instrument testing calibration steps exists is not high, the measuring equipment facility is numerous and diverse in order to overcome, Measuring Time deficiencies such as length, expense costliness, the utility model intends providing a kind of portable simulation mileage signal generator based on single-chip microcomputer and high-performance crystal oscillator, can send high-precision mileage signal, be used for measuring the accuracy of mileage gauge, measurement range 0~99.99 km, measuring accuracy is better than 0.05%.
The technical scheme that its technical matters that solves the utility model adopts is: by button 1-1 is set, measure button 1-2, crystal oscillator 1-3, input circuit 1-4, single-chip microcomputer 1-5, display screen 1-6, output circuit 1-7, output port 1 # (1-8), output port 2 # (1-9), 220V civil power 1-10, power switch 1-11, power-supply filter 1-12, + 5V Switching Power Supply 1-13, the wiring board that+12V Switching Power Supply 1-14 constitutes is fixed in the generator casing A, has at the panel of casing A and backboard and draws the Wiring port that need with tested mileage gauge be connected corresponding with the wiring board that constitutes and each controls button; Wherein by button 1-1 is set, measures button 1-2 connection input circuit 1-4 and be connected with single-chip microcomputer 1-5, crystal oscillator 1-3 directly connects single-chip microcomputer 1-5, and single-chip microcomputer 1-5 output connects display screen 1-6, connects output port 1 by output circuit 1-7 in addition # (1-8) with output port 2 # (1-9), the 220V civil power 1-10 that inserts generator by power switch 1-11 through power-supply filter 1-12 draw+5V Switching Power Supply 1-13 and+12V Switching Power Supply 1-14;
In the above-mentioned generator single-chip microcomputer to adopt technical grade single-chip microcomputer, crystal oscillator be 50% square-wave signal and 1 microsecond time-base signal for producing dutycycle, the normal application software of having solidified by single-chip microcomputer can calculate distance travelled and corresponding pulse signal frequency, show current standard mileage value in real time, give tested instrument from the corresponding pulse signal of delivery outlet output simultaneously; Utilization arranges button and selects to measure at a high speed or the middling speed measurement, and the simulation speed of a motor vehicle is 220 km/h when measuring at a high speed, and 5 km mileage Measuring Time only need 1 minute and 22 seconds.
This generator can improve measurement efficient, saves Measuring Time.Measure button and be used for selecting to begin to measure and stop to measure, stop during since 0,5 km or 0~99.99 any kilometer.Display screen is used for showing the mileage value of current standard, resolution 0.01 km.During measurement, the rate signal input end of output signal of the present utility model with tested mileage instrument (as mileometer, taximeter, automobile travel recorder etc.) linked to each other, the positive-negative power line links to each other with tested mileage gauge power supply end respectively.Open power switch of the present utility model, press button selection measurement gear is set, press the measurement button and namely begin to measure.Click the measurement button again, stop to measure, the mileage indicating value that read standard mileage value and mileage instrument record this moment respectively, calculate the mileage gauge accuracy by following formula:
Figure 84020DEST_PATH_IMAGE002
The precision of mileage gauge accuracy measurement device is brought up to 0.05%.
The beneficial effects of the utility model are, the accurate pulse signal that sends of simulating vehicle mileage gauge sensor, and the accuracy of efficiently measuring the mileage instrument brings up to 0.05% with the precision of mileage gauge accuracy measurement device; This apparatus structure is simple, simple and safe operation, and measuring repeatability is good, and long-term the use do not have drift, and measurement environment and place are not had specific (special) requirements.
Description of drawings
Fig. 1 is hardware configuration synoptic diagram of the present utility model;
Fig. 2 is software flow synoptic diagram of the present utility model;
Fig. 3 is casing front schematic view of the present utility model;
Fig. 4 is casing of the present utility model back synoptic diagram;
In Fig. 1,1-1 arranges button, and 1-2 measures button, and 1-3 is crystal oscillator, and 1-4 is input circuit, and 1-5 is single-chip microcomputer, and 1-6 is display screen, and 1-7 is output circuit, and 1-8 is output port 1 # , 1-9 is output port 2 # , 1-10 is the 220V civil power, and 1-11 is power switch, and 1-12 power-supply filter, 1-13 are+the 5V Switching Power Supply that 1-14 is+the 12V Switching Power Supply.
In Fig. 2,2-1 is initialization module, 2-2 arranges sign and shows to measure " H.00 " at a high speed, 2-3 has button-free to press judgement, 2-4 is which button of judgement is pressed, 2-5 is when button being set pressing, select to measure at a high speed the routine processes of (measure the speed sign and put 1) or middling speed measurement (measure the speed sign and put 0), 2-6 is set to 1 with Status Flag when the measurement button is pressed, if measurement speed is masked as at 1 o'clock and gets high-speed coefficient from the corresponding data memory block, if being masked as at 0 o'clock, measurement speed gets the middling speed coefficient from the corresponding data memory block, 2-7 calculates current mileage value storage and send display screen to show, 2-8 is from output port 1 # With output port 2 # Pulse signal, the 2-9 that exports current mileage value correspondence simultaneously judges that the measurement button is pressed not again, 2-10 presses to finish the measurement state when measuring button under the measurement state, clear 0 Status Flag, stop pulse output keeps showing current mileage value, forwards 2-3 to and waits for the button instruction.
In Fig. 3 and Fig. 4, for simple and clear, have from the wiring board that constitutes at panel and the backboard of casing A and to draw each corresponding Wiring ports of the needs that are connected with tested mileage gauge and each controls button; Just no longer indicate new label among Fig. 3, Fig. 4, directly utilize the label of Fig. 1, Fig. 2 to narrate in the embodiment of embodiment model machine, some Wiring port does not draw, and as 1-13 is+the 5V Switching Power Supply, and 1-14 is+the 12V Switching Power Supply.Fig. 3, Fig. 4 just no longer specifically mark, and only at from now on commodity (product), specifically draw Switching Power Supply again.Explanation hereby.
Embodiment:
Below in conjunction with drawings and Examples the utility model is further specified.
In accompanying drawing 1 hardware principle synoptic diagram, model machine is selected 8 single chip computer AT 89C51 1-5 of technical grade for use.The AT89C51 single-chip microcomputer is the control core of this model machine.Crystal oscillator is selected high-precision 12MHz crystal oscillator 1-3 for use.
Display screen 1-6 is made up of four altogether positive 8 sections LED charactrons, is used for showing current mileage value, indication range 0.00-99.99(km).For example: when mileage was 13.56 km, display screen 1-5 showed " 13.56 " km.
Input circuit 1-4 by button 1-1 be set, measure button 1-2, the PC817 photoelectrical coupler is formed, button 1-1 is connected to single-chip microcomputer after the PC817 photoelectrical coupler is done the electrostatic prevention processing I/O interface P1.6 is set, measures button 1-2 and do to be connected to P1.5 after electrostatic prevention is handled through the PC817 photoelectrical coupler.During system initialization, acquiescence is measured under high speed, and display shows " H.00 ", when pressing when button 1-1 is set, changes under middling speed and measures, and shows " L.00 ".Press when measuring button 1-2, begin to enter mileage and measure, stop mileage when pressing measurement button 1-2 this moment again and measure.
Output circuit 1-7 is made up of PC817 photoelectrical coupler, IN222 triode.The pulse signal of current mileage correspondence is from the P2.0 of single-chip microcomputer, and P2.1 exports simultaneously, respectively through passing to output port 1 after photoelectricity isolation, the power amplification # 1-8 and output port 2 # 1-9.
The working power of model machine is AC220 civil power 1-10, through power switch 1-11, behind the power-supply filter 1-12, is input to+5V Switching Power Supply 1-13, obtain Single Chip Microcomputer (SCM) system required+the 5V working power; Be input to+12V Switching Power Supply 1-14, obtain tested mileage instrument required+the 12V working power, if tested instrument working power is+24V that 1-14 need be replaced with+the 24V Switching Power Supply.
Turn on the power switch 2-1, with the speed that button 1-1 arranges mileage test is set, can select L (60 km/h) and H(220 km/h) two grades.Press and measure button 1-2, display screen 1-6 shows Current Standard mileage value, and with the signal of correspondence from output interface 1 # 1-8, output interface 2 # 1-9 exports.
In accompanying drawing 2 software flow synoptic diagram, by setting up mathematical model, use the relation that assembly language gives expression to mathematical model, work out out control software.Formed by system initialization module, button scan module, set handling module, measurement process module by normal application software (control software) software of the present utility model that single-chip microcomputer has solidified, after compiling, be solidificated in the flash memory in the 89C51 single-chip microcomputer.
The initial treatment module: comprise workspace initialization 2-1, System self-test also shows " 013985178367 ", establishes and measure speed to be masked as 1, to establish Status Flag be 0, show " H.00 " 2-2.
Button scan module: judge whether to supress and button is set or measures button 2-3, button is set then forwards set handling module entrance 2-5 to if press, then forward measurement process module entrance 2-6 to if press the measurement button, as do not have button by next scan round, the wait button is pressed.
Set handling module 2-5: will measure the negate of speed sign, display screen shows " L.00 " when measurement speed is masked as 0, and the expression middling speed is measured, and measuring speed is 60 (km/h); Display screen shows " H.00 " when measurement speed is masked as 1, and expression is measured at a high speed, and measuring speed is 220(km/h).
Measurement process module: Status Flag puts 1 and take out corresponding coefficient 2-6 according to measuring the speed sign, calculates current mileage value and is stored in internal memory and send display screen to show 2-7, calculates corresponding pulsed frequency value, from output interface 1 # With output interface 2 # Export 2-8 simultaneously, if press when measuring button, the writ attitude is masked as 0, stops to export pulse during this period, finishes mileage and measures treatment state, forwards button scan module entrance to.
If: car speed is V=220(km/h) or 60(km/h), vehicle characteristics coefficient M=5256, then output signal frequency f=(M/3600) * V.f H =?1.46×220?=?321.2(Hz),?f L =?1.46×60?=?87.6(Hz)。
If: the vehicle running time is t, then Vehicle-Miles of Travel S=V * t.Through the test of third party authority metrological service, the real output signal frequency f of this model machine H '=321.26, f L '=87.60.As the t=0.2(h of V=220(km/h)) time, S H =43.99 (km); As V=60(km/h), in the time of t=0.2(h), S L =12.00 (km).
Measuring accuracy sees Table 1-1 and table 1-2.
Table 1-1 output signal accuracy table
Speed V(km/h) ?60 220
Output signal standard frequency f(Hz) 87.6 321.2
Output signal actual frequency f ' (Hz) 87.60 321.26
Output signal accuracy 0﹪ 0.019﹪
Annotate: precision=∣ (f '-f) ÷ f ∣ * 100 ﹪
Table 1-2 mileage display precision table
Speed V(km/h) ?60 220
Elapsed-time standards t (h) 0.2 0.2
Standard mileage S(km) 12.00 44.00
Actual mileage S ' (km) 12.00 43.99
The mileage measuring accuracy 0﹪ 0.023﹪
Annotate: standard mileage S=V * t;
Precision=∣ (S '-S) ÷ S ∣ * 100 ﹪
From showing 1-1 and table 1-2 as seen, the most bad precision of embodiment is 0.023 ﹪, so can draw: the measuring accuracy of present embodiment is better than 0.05 ﹪.
Embodiment
Embodiment 1, and concrete measuring process comprised precision when " H.00 " was set:
Connect tested instrument in output interface 1 of the present utility model # 1-8 and (or) output interface 2 # 1-9.The red line of output interface is connected to the ground wire that tested instrument+12V power lead, black line are connected to tested instrument, and yellow line is connected to the speed sensor signal line of tested instrument.Turn on the power switch 1-11, the single-chip microcomputer electrification reset is from the system initialization 2-1 that brings into operation at this moment, and display screen 1-6 shows " H.00 " 2-2, enters the button scanning sequence.When pressing measurement button 1-2, output interface 1 is arrived in the corresponding pulse of output # 1-8 and output interface 2 # 1-9, display screen shows current mileage value in real time simultaneously, resolution is 0.01(Km).If will stop to measure, only need press and measure button 1-2, then stop pulse is exported and is kept stopping mileage value constantly and shows, this value as standard mileage value, is compared with the mileage value of tested instrument record, can calculate the accuracy of tested instrument.If during current being in " L.00 ", only need after stopping measurement, click button is set, just changeable is " H.00 ".
Through the metering of third party authority metering mechanism, the present embodiment measuring accuracy is better than 0.05 ﹪.
Embodiment 2, and concrete measuring process comprised precision when " L.00 " was set:
Connect tested instrument in output interface 1 of the present utility model # 1-8 and (or) output interface 2 # 1-9.The red line of output interface is connected to the ground wire that tested instrument+12V power lead, black line are connected to tested instrument, and yellow line is connected to the speed sensor signal line of tested instrument.Turn on the power switch 1-11, this moment, the single-chip microcomputer electrification reset was from the system initialization 2-1 that brings into operation, display screen 1-6 shows " H.00 " 2-2, enter the button scanning sequence, click button 1-1 is set, just changeable is " L.00 ", presses this moment when measuring button 1-2, and output interface 1 is arrived in the corresponding pulse of output # 1-8 and output interface 2 # 1-9, display screen shows current mileage value in real time simultaneously, resolution is 0.01(Km).If will stop to measure, only need press and measure button 1-2, then stop pulse is exported and is kept stopping mileage value constantly and shows, this value as standard mileage value, is compared with the mileage value of tested instrument record, can calculate the accuracy of tested instrument.
Through the metering of third party authority metering mechanism, the present embodiment measuring accuracy is better than 0.05 ﹪.
The utility model can connect 8 measurands simultaneously and work long hours (continuous more than 20 days), and the reliability height is operated very easy.

Claims (3)

1. a high-precision analog mileage signal generator is characterized in that measuring button (1-2), crystal oscillator (1-3), input circuit (1-4), single-chip microcomputer (1-5), display screen (1-6), output circuit (1-7), output port 1 by button (1-1) is set #(1-8), output port 2 #(1-9), 220V civil power (1-10), power switch (1-11), power-supply filter (1-12), + 5V Switching Power Supply (1-13), the wiring board that+12V Switching Power Supply (1-14) constitutes is fixed in the generator casing A, has on the panel of casing A and the backboard to draw the Wiring port that need with tested mileage gauge be connected corresponding with the wiring board that constitutes and each control button; Wherein by button (1-1) is set, measuring button (1-2) connection input circuit (1-4) is connected with single-chip microcomputer (1-5) again, crystal oscillator (1-3) directly connects single-chip microcomputer (1-5), single-chip microcomputer (1-5) output connects display screen (1-6), connects output port 1 by output circuit (1-7) in addition #(1-8) with output port 2 #(1-9), the 220V civil power (1-10) that inserts generator pass through power-supply filter (1-12) by power switch (1-11) and draw+5V Switching Power Supply (1-13) and+12V Switching Power Supply (1-14).
2. high-precision analog mileage signal generator according to claim 1, it is characterized in that it is 50% square-wave signal and 1 microsecond time-base signal that single-chip microcomputer in the generator adopts technical grade single-chip microcomputer, crystal oscillator can produce dutycycle, the normal application software of having solidified by single-chip microcomputer can calculate distance travelled and corresponding pulse signal frequency, show current standard mileage value in real time, give tested instrument from the corresponding pulse signal of delivery outlet output simultaneously.
3. high-precision analog mileage signal generator according to claim 1 is characterized in that generator measures button (1-2) and be used for selecting to begin to measure and stop to measure, and stops during since 0,5 km or 0~99.99 any kilometer; Display screen (1-6) is used for showing the mileage value of current standard, and resolution is 0.01 km; Measuring accuracy is brought up to 0.05%.
CN 201320259593 2013-05-14 2013-05-14 High-precision analog mileage signal generator Expired - Fee Related CN203216500U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103234559A (en) * 2013-05-14 2013-08-07 贵州省机械电子产品质量监督检验院 High-precision simulation mileage signal generator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103234559A (en) * 2013-05-14 2013-08-07 贵州省机械电子产品质量监督检验院 High-precision simulation mileage signal generator
CN103234559B (en) * 2013-05-14 2015-08-05 贵州省机械电子产品质量监督检验院 High-precision simulation mileage signal generator

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Granted publication date: 20130925

Termination date: 20140514