CN102095896B - Portable intelligent speedometer tester and using method thereof - Google Patents
Portable intelligent speedometer tester and using method thereof Download PDFInfo
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- CN102095896B CN102095896B CN 201010557730 CN201010557730A CN102095896B CN 102095896 B CN102095896 B CN 102095896B CN 201010557730 CN201010557730 CN 201010557730 CN 201010557730 A CN201010557730 A CN 201010557730A CN 102095896 B CN102095896 B CN 102095896B
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Abstract
The invention discloses a portable intelligent speedometer tester and a using method thereof, belongs to the technical field of automatic detection, and particularly relates to an intelligent tester for testing a plurality of speedometers of an airplane, a steamship, a train, a car and the like simultaneously. The portable speedometer tester based on a DSP (Digital Signal Processor) is characterized in that the tester can test speedometers to be tested without rotating the speedometers, thus equipments such as various shafts, a speed regulator, a belt driving mechanism, a roller and the like are saved; a plurality of speedometers can be tested automatically and simultaneously, measured values of the speedometers to be tested can be collected in real time, and errors can be recorded and analyzed; the tester can test speedometers used on various rotating machines through real-time maintenance of parameters; and the tester solves the problems that the traditional testing table has narrowapplication range, is inconvenient to carry, has high labor intensity and low working efficiency and the like.
Description
Technical field
A kind of portable intelligent speedometer tester of the present invention and using method thereof, belong to the test technique automatic field, is specifically related to a kind of intelligent testing equipment that can simultaneously detect many velometers such as aircraft, steamer, train, automobile.
Background technology
The vehicle speed table is the important instrument that monitors Vehicle Driving Cycle, and its intact and order of accuarcy is directly connected to the driving safety of vehicle.For guaranteeing motor vehicle running safety, avoid causing road traffic accident because of the speedometer misalignment, regulation according to " Measurement Law of the People's Republic of China " the 9th, " Measurement Law of the People's Republic of China detailed rules for the implementation " the 25, necessary Put into practice by operation of law cycle verification with measurement instrument the time, check-verifying period was no longer than 1 year.Although current research is a lot, but be all generally to carry out on experiment table, on experiment table, the speed with coaxial standard speed table is indicated verification kilsyth basalt to be measured, while using the checking table calibration, the velometer on motor vehicles must be removed, work is complicated, labour intensity is large, also has in addition the problems such as inconvenience, inefficiency, calibration accuracy are low of carrying." the intelligent digital display autometasomatism checking table " as Wu Zhengbin, Yang Xiaosong, introduced adopts two-wheel-double drum type structure, allow drive axle wheel and the testing table of automobile measure the cylinder positive engagement, the linear velocity of automotive wheel just equals to measure the linear velocity of cylinder so, with this, velometer is carried out to verification." the dual-purpose checking table of the intelligent locomotive speedmeter diesel engine tachometer of LSY 1 " that Tan Cimin introduces is mainly by synchronous belt drive mechanism, the compositions such as intelligent standard table and controllable silicon stepless speed-regulating device, they are arranged on respectively in the switch board of a sheet metal structure, to several critical components of checking table, made meticulous type selecting in design.As adopt synchronous belt drive mechanism, and greatly simplify the structure, reduced deadweight and noise, with the speed governing of controllable silicon stepless speed-regulating device, guaranteed adjustment width, reached the purpose of modification stability.But above-mentioned checking table is mainly all by the synchronous belt drive mechanism driving, and tachometer gage (or sensor) is contained in crankshaft end, cam axle head or other axle heads, also AC speed regulator must be arranged, and the complex structure cost is high.
The author also once introduced a calibration equipment in " DesigR for the SYstem of Speedometer TestiRg Set " literary composition, to use the MCS51 microcomputer development, the velometer be used in the verification electric locomotive, it is for the special object purposes, can send the coded pulse of the DF16 photoelectric encoder of electric locomotive use, make velometer show the purpose that reaches verification.This civilian calibration equipment fails to fetch the actual value of velometer, thereby gives the number that do not deviate, and scope of application limitation is very large.
Summary of the invention
A kind of portable intelligent speedometer tester of the present invention and using method thereof, purpose is for the above-mentioned openly limitation of checking table, provide a kind of the needs just can be to the device of its verification by kilsyth basalt to be measured rotation, it has saved various axles, arrangements for speed regulation, the equipment such as belt gear and cylinder, can realize simultaneously the automatic Verification to many velometers, and the measured value of energy Real-time Collection kilsyth basalt to be measured, so that its error is recorded and is analyzed, can realize the verification of various rotating machinery operating speed tables by the real-time servicing of parameter, narrow to solve existing checking table range of application, carry inconvenience, labour intensity is large, the problems such as inefficiency, the present invention is based on the portable velometer tester of DSP and the technical scheme of using method thereof.
A kind of portable intelligent speedometer tester of the present invention, it is characterized in that a kind of portable velometer tester based on DSP, the technical scheme that this tester is taked mainly is comprised of micro controller unit, communications interface unit, signal condition unit, keyboard display unit and clock unit, wherein:
Described micro controller unit comprises DSPCPU, the outer RAM of sheet, power supply, crystal oscillating circuit, jtag interface circuit, and the LCD pilot lamp reaches and wire jumper;
Described communications interface unit comprises the RS-232 driving circuit;
Described signal condition unit comprises pulse signal input modulate circuit and output of pulse signal modulate circuit;
Described keyboard display unit comprises keyboard interface circuit and LCD display circuit;
Described clock unit comprises the level conversion buffer circuit;
To each module of the above, communications interface unit is connected with microcontroller by serial communication interface module SCI, and signal condition unit, keyboard display unit, clock unit are connected with microcontroller by the I/O mouth;
The outer RAM of sheet in the micro controller unit of the above is connected with DSP by address data bus and the chip select line of 16;
To the above the serial communication modular of communications interface unit DSP by driving chip MAX3232 to be connected with host computer;
The pulse signal input of signal condition unit to the above is connected with the IO mouth of DSP by the isolation buffer circuit, and the pulse signal of exporting from DSP IO mouth is sent into by the velometer of verification after photoelectricity is isolated;
Pulse signal from the output of DSP IO mouth in the signal condition unit of the above is sent into by the velometer of verification after the photoelectricity isolation, the output of velometer digital quantity signal is connected with the IO mouth of DSP by the isolation buffer circuit, the velometer analog signals is connected with the ADC of DSP through conditioning.
Matrix keyboard end line in the keyboard display unit of the above is connected with the IO mouth of DSP, and LCD is connected with the I/O Parallel of DSP by level switch module;
Clock unit to the above is to be connected with the IO of DSP by the level conversion buffer circuit.
The using method of above-mentioned a kind of portable intelligent speedometer tester is characterized in that implementation step is as follows:
Velometer receives the photoimpact from photoelectric speed sensor when equipment moves, and during use, it is connected on to outer rim, often circles as K pulse, and output waveform is square wave, and dutycycle is 50% ± 2%, and output amplitude is high level>=U
h, low level≤U
l, this signal is through isolation, and the actuating speed table shows, designs the output system of the replacement sensor that can export same signal according to above-mentioned parameter; By keypad function key parameters, and can provide operational order, comprising:
Wheel diameter is set, the photoelectric coding number that a circle sends is set, show wheel diameter, the display speed value, given speed, verification, detect data and store and send to host computer.
For each piece velometer, difference due to the swiveling wheel diameter, all it to be inputted each time to DSP to send and the corresponding umber of pulse of linear velocity, owing to the information of test data, deviation and time all will being recorded in to the outer RAM of sheet and passing to host computer, so native system has calendar and clock chip DS12887, by calendar and clock initial value are set, DS12887 starts clock and remember day automatically, after the input that completes above-mentioned parameter and adjusting, input a velocity amplitude, click " beginning " of keyboard, DSP just starts to go out timing according to set calculation of parameter, and take this time as the cycle to the velometer transmitted always, velometer display speed value, until key in next velocity amplitude, the process of DSP double counting, output and verification again, the wheel speed pickup that circles is sent out K pulse, turns R week KR pulse, if the swiveling wheel diameter is the D millimeter, given speed is R kilometer/hour, is (10
6r)/(3600) mm/second, (10
6r)/(3600 π D) cycle per second, namely (10
6r) * K/(3600 π D) umber of pulse/second, recurrence interval T=(3600 π D)/((10
6r) * K) second, because the pulse signal dutycycle of velometer is 1/2, therefore timing is got T/2, crystal oscillator is 30MHZ, and regularly initial value Y should meet: (65535-Y) 12/(30 * 10
6)=(1/2) (3600 π D)/((10
6r) * K), so Y=65535-4500 π D/(R * K), whenever timing arrives, produce Interruption, carry out interrupt service routine, in interrupt service routine to the output terminal negate, so just obtained the low and high level uniform pulse waveform of being separated by, and the output voltage high level is 12V, it is the magnitude of voltage of insulating power supply, according to speed pickup output amplitude capable of regulating, the TTL low level value is 0.3V, with the output signal of speed pickup, fit like a glove, this signal is connected and exports to velometer with soft connector by the I/O mouth with the photoelectricity isolation, velometer is shown, with this, velometer is carried out to verification,
Data recording, inquiry, analysis part are realized by the host computer PC, this function utilizes SQL Server 2008 databases to develop on the PowerBuilder11.5 platform, supplement the modules such as management, data receiver inquiry and form by system maintenance, data receiver management, data receiver information, the real time data of many velometers of the present invention gathers by the I/O mouth of DSP, the actual numerical value of reading speed table after sending pulse signal, and be recorded in the outer RAM of sheet, carry out necessary analysis for follow-up after passing to host computer.
The advantage of a kind of portable intelligent speedometer tester and using method thereof is: because the structure to checking table is improved, and in conjunction with the CPU technology, as long as being with this prover gets on the bus, connect cable with velometer, can start test, and needn't pull down velometer, solve that existing checking table carries inconvenience, labour intensity is large and the problem such as inefficiency, with existing checking table, compare, advantage and good effect that it is main are:
(1) realized the verification of velometer fully by CPU and digital technology, do not needed the structures such as complicated belt gear, bent axle, camshaft, AC speed regulator, product is more integrated, portability, reliability is high, cost is low, long service life;
(2) applied widely, all parameters can be inputted in real time, comprise swiveling wheel diameter, often turn around the photoelectric coding number of sending, the amplitude of photoimpact, the velometer verification of, different application occasion dissimilar to adapt to;
(3) powerful, 16 velometers of verification simultaneously;
(4) system architecture is clear, ease for operation is strong, the check results intuitive display;
(5) verification speed is fast, and automaticity is high, and precision is high; The present invention is aspect the generation of pulse signal; not the frequency of calculating signal, but calculate the cycle of pulse, because the crystal oscillator frequency of DSP is higher; so its timing can arrive Microsecond grade; therefore the cycle precision drawn is high, and the resolution of measuring speed is very high, and measurement range is very wide; can reach the speed range of tens thousand of kilometers/hour; pulse signal is isolated and is delivered to the I/O mouth by photoelectricity, and the I/O mouth can be exported 16 tunnels simultaneously, the several piece velometer is tested simultaneously;
the accompanying drawing explanation
Fig. 1 is the theory diagram that the present invention is based on the velometer intelligence prover of DSP;
Fig. 2 is microcontroller schematic diagram of the present invention;
Fig. 3 is communication interface schematic diagram of the present invention;
Fig. 4 is the present invention's 16 road pulse signal genration schematic diagrams;
Fig. 5 is 16 velometer output signal acquisition principle figure of the present invention;
Fig. 6 is keyboard interface circuit schematic diagram of the present invention;
Fig. 7 is display circuit schematic diagram of the present invention;
Embodiment
By reference to the accompanying drawings the specific embodiment of the present invention is further described in detail as follows:
As described in Figure 1, a kind of portable velometer prover based on DSP of the present invention, comprise micro controller unit, communications interface unit, signal condition unit, keyboard display unit, wherein:
Described micro controller unit, the minimum system of DSP comprises CPU, the outer RAM of sheet, power supply, crystal oscillating circuit, jtag interface circuit, LCD pilot lamp and necessary wire jumper;
Described communications interface unit comprises the RS-232 driving circuit;
Described signal condition unit comprises pulse signal input modulate circuit and output of pulse signal modulate circuit;
Described keyboard display unit comprises keyboard interface circuit and LCD display circuit;
To each module of the above, communications interface unit is connected with microcontroller by serial communication interface module (SCI), and signal condition unit, keyboard display unit are connected with microcontroller by the I/O mouth.
As described in Figure 2, micro controller unit CPU adopts the TMS320LF2407 dsp chip of TI company, has expanded the RAM of a slice 64 * 16bit, adopts the CY7C1021CV33 chip of CYpress company, it is connected with DSP by address data bus, chip select line, the read-write line of 16, uses
(gated data space) and
(the gating program space) and select lines as RAM.Emulator is connected with DSP by the JTAG emulation interface, so that debugging DSP hardware and software.Power module is to adopt the Switching Power Supply of 12V to convert the 5V direct current to through the L7805 three terminal regulator.Voltage transitions adopts the convert to+3.3V of 5V/3V high-performance voltage stabilizing chip TPS7333Q general+5V of TI company for DSP, for the steady operation that guarantees chip and the antijamming capability that improves core board, between modulus voltage and modulus ground, adopts respectively 10mH inductance and 0
resistance is isolated, and at each power supply input pin place of chip, has connected decoupling capacitor.Reset circuit adopts MAXIM company to have the MAX811 chip of artificial reset function, realizes the precision monitoring to voltage, the several functions such as provides power-off reset, electrification reset and voltage to fall to reset.Clock circuit adopts the crystal oscillator mode, PLL clock circuit and crystal oscillating circuit, consists of, and PLL clock circuit has designed by 0.015
f, 0.68
f electric capacity and 11
the PLL filtering circuit that forms of resistance, crystal oscillator is selected the active crystal oscillator of 10M, its 4 pin connects 3.3V voltage, 2 pin ground connection connect the CLKIR pin of DSP at 3 pin, through inner 4 frequencys multiplication of DSP, obtain the system clock of 40MHz.
As described in Figure 3, the SCI communications interface unit has adopted the low consumption that meets rs-232 standard to drive chip MAX3232, realizes the conversion between Transistor-Transistor Logic level and PC level, by the Modbus agreement, realizes the communication between DSP and host computer.
As described in Fig. 4 and Fig. 5, in the signal condition unit, the digital output of 16 road velometers is connected with the IO mouth of DSP after photoelectricity TLP521-4 isolation, SR74LS244R buffering, and the pulse signal of 16 road IO mouth outputs sends into through photoelectricity TLP521-4 isolation 16 velometers that are calibrated.
As described in Fig. 6 and Fig. 7, in keyboard display unit, keyboard interface circuit has designed function key and numerical key, as the setting of velometer number, Speed Setting, the tip diameter photoelectric coding number of sending of setting, often turn around is set.The keyboard used is 12 key boards of 4 * 3, and the shift function is set, and function key and numerical key are multiplexing, and 7 pin that keyboard is drawn are connected with the IOPB0-IOPB6 of DSP respectively.IOPB4 ~ IOPA6 is 1st ~ 3 row of corresponding keyboard respectively, and IOPB0 ~ IOPB3 is 1st ~ 4 row of corresponding keyboard respectively, and 4 capable pin of keyboard are connected with 3.3V by pull-up resistor respectively simultaneously.The display circuit Liquid Crystal Module adopts the CM128640-10SLYB liquid crystal display, it is connected with DSP by read-write line, chip select line, data bus, DSP data-interface (3.3V) and LCD(5V) use the level translator SR74LVC4245DB of TI company to carry out the bus level conversion between data-interface, the contrast of using the slide rheostat of 20K Ω to show with adjustable liquid crystal display.
During use, at first intelligence calibration detector is installed, the personnel of its described technical field can both realize.Next is the use method of operating of intelligence calibration detector.
Native system can provide the required pulse signal of velometer, thereby has realized the Static Detection problem of velometer.System is divided the two large divisions, i.e. velometer part of detecting and data recording, inquiry, analysis part.
One, the velometer verification is realized by DSP, by keypad function key parameters, and can provide various operational orders, comprising:
F1: wheel diameter is set, inputs successively the four figures value, four of less thaies, front mends 0, and " CL " sign is arranged;
F2: given speed, input successively three bit value, three of less thaies, front mends 0, often establishes once, presses " beginning " key, just starts to calculate umber of pulse according to the parameter, the velograph that arrange, by the I/O mouth, is defeated by velometer;
F3: the photoelectric coding number that a circle sends is set, inputs successively the four figures value, four of less thaies, front mends 0, and " SL " sign is arranged;
F4: show wheel diameter, show the four figures value on keyboard, and " ZJ " sign is arranged;
F5: the display speed value shows three bit value, and " SD " sign is arranged on keyboard;
F6: send, will remember record in comprehensive board memory RAM and upload to PC, simultaneously by the RAM zero clearing;
Two, data recording, inquiry, analysis part are realized by host computer (PC).This function utilizes SQL Server 2008 databases to develop on the PowerBuilder11.5 platform, by system maintenance, data receiver management, data receiver information, is supplemented the modules such as management, data receiver inquiry and is formed.
System maintenance is the Chinese character typing to information such as personnel, for use and provide convenience later, and guarantees the uniqueness of its typing.After entering the data receiver management, first click " reception data " knob, then press the F key transmission of CPU comprehensive function plate, screen occurs receiving, after distributing Deng pending data, be that PC receives, " X " that click to receive the screen upper right corner exits, then clicks " translation data ", the data that receive back just are presented in following data window, finally click " entering total storehouse ", these records just enter Zong Ku, and the content of data window disappears simultaneously.
Then enter data receiver information and supplement administration module, supplement the information such as test person.At first input from date and date of expiry, whole records after carriage return in this date section just are presented in following data window, after selecting test person, all record all adds upper this test person, the test person place that also can click each adds one by one or revises test person, also can add simultaneously and confirm people or remark information etc.
The data receiver enquiry module is established for data query information, clicks blockage, chooses this condition, all conditions of choosing be " with " relation.Click " condition is selected ", the record satisfied condition just is presented in following data window.Click " all inquiries ", all record all shows again.But also can modify to relevant information (confirming people, remarks), revised rear click " modification completes ", the Password Input window appears, if defeated right modification comes into force, otherwise will not come into force.
Claims (1)
1. a portable intelligent speedometer tester, it is characterized in that a kind of portable velometer tester based on DSP, and this tester comprises micro controller unit, communications interface unit, signal condition unit, keyboard display unit and clock unit, wherein:
Described micro controller unit comprises DSPCPU, the outer RAM of sheet, power supply, crystal oscillating circuit, jtag interface circuit, LCD pilot lamp and wire jumper;
Described communications interface unit comprises the RS-232 driving circuit;
Described signal condition unit comprises pulse signal input modulate circuit and output of pulse signal modulate circuit;
Described keyboard display unit comprises keyboard interface circuit and LCD display circuit;
Described clock unit comprises the level conversion buffer circuit;
Described communications interface unit is connected with DSPCPU by the serial communication interface module SCI in DSP, and described signal condition unit, keyboard display unit, clock unit are connected with DSPCPU by the I/O mouth in DSP;
The outer RAM of sheet in described micro controller unit is connected with DSP by address data bus and the chip select line of 16;
Described serial communication interface module SCI has adopted the low-power consumption that meets rs-232 standard to drive chip MAX3232, realizes the conversion between Transistor-Transistor Logic level and PC level, by the Modbus agreement, realizes the communication between DSP and host computer;
The pulse signal input of described signal condition unit is connected with the I/O mouth of DSP by the isolation buffer circuit, the pulse signal of exporting from the I/O mouth of DSP is sent into by the velometer of verification after the photoelectricity isolation, wherein the output of velometer digital quantity signal is connected with the I/O mouth of DSP by the isolation buffer circuit, and the velometer analog signals is connected with the ADC of DSP through conditioning;
Matrix keyboard end line in described keyboard display unit is connected with the I/O mouth of DSP, and the LCD display circuit is connected with the I/O mouth of DSP by level switch module;
Described clock unit is to be connected with the I/O mouth of DSP by level conversion isolation buffer circuit.
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| CN 201010557730 CN102095896B (en) | 2010-11-20 | 2010-11-20 | Portable intelligent speedometer tester and using method thereof |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360202A (en) * | 2011-07-20 | 2012-02-22 | 平湖市电子有限公司 | Portable digital temperature compensating type crystal oscillator chip reader-writer and reading/writing method thereof |
| CN106291317B (en) * | 2016-07-28 | 2019-06-04 | 袁伟家 | A kind of track circuit shunting parameter intelligent tester and its implementation |
| CN106708011A (en) * | 2016-12-05 | 2017-05-24 | 河南辉煌科技股份有限公司 | Locomotive simulation apparatus based on DSP |
| CN110211524B (en) * | 2019-06-04 | 2022-07-08 | 格力电器（郑州）有限公司 | Speed-adjustable automatic display method and device for nixie tube |
| CN112235153A (en) * | 2020-09-04 | 2021-01-15 | 国网湖北省电力有限公司电力科学研究院 | Multifunctional carrier module tester |
| CN112067849B (en) * | 2020-09-23 | 2022-07-22 | 广州广电计量检测股份有限公司 | Speedometer sensor calibration system |
| CN112505246B (en) * | 2020-11-11 | 2023-05-02 | 山西科致成科技有限公司 | Digital mining gas sensor calibration and verification device and method |
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