CN104848987A - Automobile exhaust pollutant test chassis dynamometer calibration system - Google Patents
Automobile exhaust pollutant test chassis dynamometer calibration system Download PDFInfo
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- CN104848987A CN104848987A CN201510295244.1A CN201510295244A CN104848987A CN 104848987 A CN104848987 A CN 104848987A CN 201510295244 A CN201510295244 A CN 201510295244A CN 104848987 A CN104848987 A CN 104848987A
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Abstract
The invention discloses an automobile exhaust pollutant test chassis dynamometer calibration system comprising a signal control panel, an input device, an output device, a display, and a power supply. The signal control panel is a PIC single chip microcomputer. The input device includes sensors and a time frequency input module, the sensors include a speed sensor and a pull-pressure sensor, and the time frequency input module adopts a crystal oscillation circuit as a standard time interval generation circuit. The output device is a computer. The display adopts a liquid crystal touch-sensitive screen. The signal control panel and the display carry out data interaction. The signal control panel is connected with the output device through a USB interface. The input device is connected with the input end of the signal control panel. The automobile exhaust pollutant test chassis dynamometer calibration system of the invention has the characteristics of being simple and convenient to operate, stable and reliable, and the like, and is suitable for all levels of metrological verification mechanisms to calibrate automobile exhaust pollutant test chassis dynamometers mounted on motor vehicle safety test lines, comprehensive test lines and motor vehicle environmental protection test lines.
Description
Technical field
The present invention relates to the collimation technique of chassis dynamometer, specifically a kind of automobile exhaust contaminant detection chassis dynamometer calibration system.
Background technology
Along with the quick increase of China's vehicle guaranteeding organic quantity, pollution emission is serious, has become one of primary pollution source that air quality degenerates, has also become the improvement emphasis of various places government.In order to better control vehicle emission standards, country has issued GB 18285-2005 " spark-ignition engine automobile exhaust pollutant discharge limit value and measuring method ", gives spark-ignition engine steady state condition method (ASM) and simple transient behavior method (VMAS) method of testing.Meanwhile, country has issued GB 3847-2005 " C.I. Engines of Automobile and compression ignition engine automobile exhaust smoke emission limit and measuring method ", gives the method for testing of compression ignition engine automobile underlug-down mode method (Lug-Down).Increasing city adopts above several detection method.In above-mentioned several detection method, automobile exhaust contaminant detection chassis dynamometer is the metering and measuring equipment that all will configure.Its inertia when simulating vehicle is in road actual travel when detecting and the special measuring equipment of resistance.Its metering performance whether accurate, directly has influence on the numerical value of tested automobile exhaust contaminant composition, is related to government to the management of automobile quality of tailpipe emission under road load operating mode and improvement.
National measurement technical specification JJF 1221-2009 " automobile exhaust contaminant detection chassis dynamometer calibrating standard " issues and implements.The metering performance of this national regulation to automobile exhaust contaminant detection chassis dynamometer has done some technical requirements, and gives calibration steps.When calibration is carried out to the metering performance of automobile exhaust contaminant detection chassis dynamometer, standard device be used.Existing standard device, operates very inconvenient, and calculated amount is large, at the bottom of work efficiency pole, can not reflect the automobile exhaust contaminant detection chassis dynamometer measuring parameter of national regulation requirement intuitively, bring no small trouble to calibration operation.At present, the domestic Metrological Standard Equipment also not requiring to adapt with national regulation, existing Metrological Standard Equipment is that the standard device of its project converts, and can only be used as the calibration of basic parameter.
Summary of the invention
The object of the present invention is to provide a kind of automobile exhaust contaminant detection chassis dynamometer calibration system, be applicable to metering validation activity at different levels and automobile exhaust contaminant detection chassis dynamometer is joined to information of safety inspection for motor vehicles line, comprehensive detection line and motor vehicle environmental protection tests line carry out calibration operation.
For achieving the above object, the invention provides following technical scheme:
Automobile exhaust contaminant detects and uses chassis dynamometer calibration system, comprises signal control panel, input equipment, output device, display and power supply; Described signal control panel is PIC single chip microcomputer; Described input equipment comprises sensor and temporal frequency load module, and described sensor comprises speed pickup and pull pressure sensor, and described temporal frequency load module adopts crystal oscillating circuit as standard time interval circuit for generating; Described output device is computing machine; Described display adopts liquid crystal touch screen; Described power supply is signal control panel, input equipment, output device, monitor power supply, described signal control panel and display carry out data interaction, described signal control panel is connected with output device by USB interface, and described input equipment is connected with the input end of signal control panel.
As the further scheme of the present invention: the data communication between described signal control panel and display adopts RS232 serial ports, the data communication between described signal control panel and sensor adopts RS232 serial ports.
As the further scheme of the present invention: described display and output device share one piece of liquid crystal touch screen.
As the further scheme of the present invention: described speed pickup is photoelectric coding speed pickup.
As the further scheme of the present invention: described power supply comprises AC power and direct supply, described AC power adopts external power supply to be single-phase 220 ± 20%V/50Hz, described direct supply adopts internal battery+6V, can automatically switch between described AC power and direct supply; When adopting external power supply AC220V, converting+6V direct supply to through AC/DC power module, to internal battery charging, providing power supply to display, signal control panel simultaneously; When there is no external power supply AC220V, directly powered by internal battery.
As the further scheme of the present invention: the powered operation time of described direct supply is not less than 6 hours.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention is the domestic calibration system first researched and developed automobile exhaust contaminant detection chassis dynamometer and automatically detect at present, there is the features such as easy and simple to handle, reliable and stable, be applicable to metering validation activity at different levels and automobile exhaust contaminant detection chassis dynamometer is joined to information of safety inspection for motor vehicles line, comprehensive detection line and motor vehicle environmental protection tests line carry out calibration operation.
According to the actual conditions of mobile testing line configuration detection device layout, adopt modular design, and reserve multiple interfaces at primary module, the function being convenient to system expands, and under the prerequisite ensureing calibrating accuracy, achieves the variation of function.
The present invention adopts high sensitivity touch screen technology, complete good in interactive function, solve the information input quantity existing for the instruction of dependence key-press input that current timing class measurement instrument on-site proving instrument generally adopts little, input regulates the drawbacks such as inconvenient, not directly perceived, substantially reduce the volume and weight of calibrating instrument, add simplicity and the reliability of operation, and the automaticity of instrument, be more suitable for the requirement of on-site proving work.
Under the prerequisite not affecting checkout equipment technical feature, adopt the method that combines with hardware configuration of software programming technique, make testing staff detect data and examine and determine raw readings just as writing, complete testing, greatly reduce the workload of testing person, improve work efficiency.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of automobile exhaust contaminant detection chassis dynamometer calibration system;
Fig. 2 is the workflow diagram of automobile exhaust contaminant detection chassis dynamometer calibration system.
Embodiment
Below in conjunction with the embodiment of the present invention and accompanying drawing, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, in the embodiment of the present invention, automobile exhaust contaminant detects and uses chassis dynamometer calibration system, comprises signal control panel, input equipment, output device, display and power supply; Signal control panel is PIC single chip microcomputer; Input equipment comprises sensor and temporal frequency load module, temporal frequency load module adopts the crystal oscillating circuit of high precision, high stability as standard time interval circuit for generating, sensor comprises speed pickup and pull pressure sensor (i.e. torsion torque sensor), and this speed pickup is the multi signal photoelectric coding speed pickup of import; Output device is computing machine; Display adopts the liquid crystal touch screen of friend's profit China; Power supply is signal control panel, input equipment, output device, monitor power supply, and signal control panel and display carry out data interaction, and signal control panel is connected with output device by USB interface, and input equipment is connected with the input end of signal control panel.
Display and output device share one piece of liquid crystal touch screen, possess the dual-use function of display and logging data, can the typing of data in the input of completion system inside basic parameter and verification process by liquid crystal touch screen.
The data communication of signal control panel and display adopts RS232 serial ports to complete.
The data communication of signal control panel and each parameter measurement sensor adopts RS232 serial ports to complete.
Signal control panel is connected with computing machine and adopts USB interface to complete.
Power supply comprises AC power and direct supply, and AC power adopts external power supply to be single-phase 220 ± 20%V/50Hz, and direct supply adopts internal battery+6V, and these two kinds of power supply modes can automatically switch, and the powered operation time of this direct supply is not less than 6 hours.When adopting external power supply AC220V, converting+6V direct supply to through AC/DC power module, to internal battery charging, providing power supply to display, signal control panel simultaneously; When there is no external power supply AC220V, directly powered by internal battery.
The key issue of automobile exhaust contaminant detection chassis dynamometer Design of Calibration System: one is that velocity measuring will have higher accuracy and stability; Two is that coasting time measurement will have higher timing accuracy and stability; Three is that each test item detection interfacial force is consistent with raw readings, realizes write record formula and detects; Four is that automobile exhaust contaminant detection chassis dynamometer according to the requirement of the regulation of national calibrating standard and client, can preset calibration steps, automatically complete detection.
In order to accomplish the coasting time automatically measuring each stage, immediately will measure, and make the judgement of ascent stage or decline stage to the speed parameter of equipment, this is the difficult point of native system design, is also innovative point.Native system adopts Measuring Frequency Method to be main method, carries out preliminary survey, when the frequency measuring rotating speed is less than 10K to frequency, then according to the frequency values of preliminary survey, determine that different N values converts corresponding cycle test method to and tests more accurately, the speed-frequency realizing intelligence is measured, by calculating instantaneous velocity.Concrete theory: when rotating speed is lower in the adjacent same edge of measured signal (one-period), obtain internal reference clock timing difference, just can show that f=1/ (timing difference * time base precision) namely uses outside access measured signal, at adjacent twice negative edge of measured signal, obtain the value of the counting unit of timer respectively, its difference just can be drawn the frequency of measured signal through number computing, calculate tachometer value.Fix in a period of time T when rotating speed is higher at internal reference clock timing, calculate the same edge number that row surveys signal, just can draw f=edge number/T.Counter access measured signal, in timer timing one section of reference time T, the negative edge number (value of the counting unit of timer T1) of counting measured signal, just can draw the frequency of measured signal, calculate tachometer value through computing.The velocity survey scope of native system is (0 ~ 100) km/h, MPE: ± 0.1%.The coasting time measurement range of native system is 0 ~ 999.999s, MPE: ± 3ms.
Native system, by the luxuriant and rich with fragrance gate delay line design of CPLD interior optimization, achieves the accurate measurement to the time.By uninterrupted accurate calibration, ensure that measuring accuracy at different temperatures.
Consider the requirement of the job specification of gauge check industry and the code of foundation or specification, in order to reach just as to write calibrating record the same when testing person examines and determine, being all placed on and examining and determine in raw readings form and carry out all working.During software programming, do a lot of process, the machine language write raw readings form directly control signal changed by adopting C language.Also good C language and database design well to be merged.
Refer to Fig. 2, in the master routine Software for Design of signal control panel, to modularization and the design of being optimized property of functionalization of software, each function is all carried out zoning design, specific as follows:
1) definition of the important parameter of program, variable and initialization, interrupt routine are all designed to subroutine, major function performs in master routine;
2) in master routine, reading data, static test, in real time control, transmission data have all been carried out zoning design, and make software thought smooth like this, flow process is simple, facilitates operation and the reading of program;
3) when reading data and sending data, the method taking timer mode and calculating and verification makes data transmission true and reliable, avoids data transmission conflict;
4) at master routine, the optimal design of break period and master routine working time is mainly considered to the design of function, make, in master routine working time, the process of an interrupt routine can be completed.
Native system completes conversion, optimum configurations, the display of real-time clock, the AD conversion of cell voltage between each page of display and shows in major cycle, and the measure the item of native system is as follows:
1, velocity survey
By contact cylinder measurement mechanism, adopt the multi signal photoelectric coding speed pickup of import to obtain tach signal, control through signal control panel and be converted into the linear velocity of cylinder surface.
2, force measurement
Configure high-precision pull pressure sensor, during calibrating, access tested equipment by coupling arrangement, by control system, force value signal is processed, convert force value to and export, be convertible into N or kg unit.
3, time measurement
Adopt the crystal oscillating circuit of high precision, high stability as standard time interval circuit for generating; Designed by the not gate lag line of CPLD interior optimization, achieve the accurate measurement to the time.According to different speed trigger conditions, the corresponding coasting time section of accurate recording, reaches the object of relative method calibrating.
The present invention has the advantages that automatically measure coasting time, timing accuracy, the hommization of calibration operation flow process.Native system is applicable to: the calibration of (1) automobile exhaust contaminant detection chassis dynamometer detects; (2) calibrating of automotive speedometer monitor station; (3) calibrating of the heavy platform of motor vehicle detecting special axis (wheel); (4) calibrating of motor vehicle drum reaction brake test bench; (5) calibrating actual value, standard value can realize automatic value and manual input value; (6) chassis dynamometer, constant load, variable load slide theoretical time and elementary inertia DTW, automatic Verification calculating, insert in raw readings form; (7) gauging error, inquiry test record is automatically processed; (8) read data with computer, print original calibrating record and calibration certificate; (9) this instrument has the calibrating of higher level metrological service and calibration function.Wherein, (2), (3), (4) item be expanded function, therefore, native system becomes a kind of detection line comprehensive detection system.
Through sending measuring science Institute for Research and Technology of Henan Province to detect, the technical indicator that native system realizes parameter is as follows, reaches designing requirement: 1) timing measuring scope 0-500s, resolution 0.001s, accuracy ± 0.001s; 2) velocity survey scope 0-100km/h, resolution 0.001km/h, accuracy ± 0.1%; 3) dynamometry measurement range 0-100000N, resolution 0.01N, accuracy 0.3 grade; 4) weighing measurement scope 0-100000kg, resolution 0.01kg, accuracy 0.3 grade.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.
In addition, be to be understood that, although this instructions is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should by instructions integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.
Claims (6)
1. automobile exhaust contaminant detects and uses chassis dynamometer calibration system, it is characterized in that, comprises signal control panel, input equipment, output device, display and power supply; Described signal control panel is PIC single chip microcomputer; Described input equipment comprises sensor and temporal frequency load module, and described sensor comprises speed pickup and pull pressure sensor, and described temporal frequency load module adopts crystal oscillating circuit as standard time interval circuit for generating; Described output device is computing machine; Described display adopts liquid crystal touch screen; Described power supply is signal control panel, input equipment, output device, monitor power supply, described signal control panel and display carry out data interaction, described signal control panel is connected with output device by USB interface, and described input equipment is connected with the input end of signal control panel.
2. automobile exhaust contaminant detection chassis dynamometer calibration system according to claim 1, it is characterized in that, data communication between described signal control panel and display adopts RS232 serial ports, and the data communication between described signal control panel and sensor adopts RS232 serial ports.
3. automobile exhaust contaminant detection chassis dynamometer calibration system according to claim 1, is characterized in that, described display and output device share one piece of liquid crystal touch screen.
4. automobile exhaust contaminant detection chassis dynamometer calibration system according to claim 1, it is characterized in that, described speed pickup is photoelectric coding speed pickup.
5. automobile exhaust contaminant detection chassis dynamometer calibration system according to claim 1, it is characterized in that, described power supply comprises AC power and direct supply, described AC power adopts external power supply to be single-phase 220 ± 20%V/50Hz, described direct supply adopts internal battery+6V, can automatically switch between described AC power and direct supply; When adopting external power supply AC220V, converting+6V direct supply to through AC/DC power module, to internal battery charging, providing power supply to display, signal control panel simultaneously; When there is no external power supply AC220V, directly powered by internal battery.
6. automobile exhaust contaminant detection chassis dynamometer calibration system according to claim 5, it is characterized in that, the powered operation time of described direct supply is not less than 6 hours.
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| CN109238987A (en) * | 2018-10-11 | 2019-01-18 | 成都中安瑞晨科技有限责任公司 | A kind of multispectral vehicle exhaust monitoring device |
| CN110954264A (en) * | 2019-12-12 | 2020-04-03 | 浙江省计量科学研究院 | Wireless state monitoring and diagnosing system of chassis dynamometer for detecting automobile exhaust pollutants |
| CN112379193A (en) * | 2020-10-27 | 2021-02-19 | 山东大学 | Method for testing system precision of simple transient working condition method |
| CN113074867A (en) * | 2021-02-18 | 2021-07-06 | 河南省计量科学研究院 | Calibration equipment for torsion calibration device of chassis dynamometer |
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Cited By (5)
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| CN112379193A (en) * | 2020-10-27 | 2021-02-19 | 山东大学 | Method for testing system precision of simple transient working condition method |
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Application publication date: 20150819 |