CN1588087A - Detecting device and its detecting method for gasoline vehicle simple transient worknig condition tail gas - Google Patents
Detecting device and its detecting method for gasoline vehicle simple transient worknig condition tail gas Download PDFInfo
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- CN1588087A CN1588087A CN 200410070850 CN200410070850A CN1588087A CN 1588087 A CN1588087 A CN 1588087A CN 200410070850 CN200410070850 CN 200410070850 CN 200410070850 A CN200410070850 A CN 200410070850A CN 1588087 A CN1588087 A CN 1588087A
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Abstract
The invention discloses a simple instant operating condition tail gas detecting device for gasoline motor car and its detecting method. The device includes a primary computer, driver assistant device, printer, bottom plate power measuring device and tail gas quality analyzing system, it uses ASM series of bottom plate power measuring device of German MAHA corporation and VMAS car tail gas quality analyzing system of American Sensors corporation, the system includes gas analyzing device, flux gauge and motor tachometer. The primary computer stores the operation series of the tail gas detection, which orders the driver assistant device to execute the tail gas detecting step in instant operating condition, and outputs the detected result to the printer. The method is more scientific, and it is very effective.
Description
Technical field
The present invention relates to measurement mechanism and measuring method, be specifically related to a kind of gasoline vehicle simple transient worknig condition tail gas pick-up unit and detection method thereof.
Background technology
At present, the vehicle exhaust pick-up unit adopts usually as idling method pick-up unit and ASM stable state loading condition pick-up unit.
Vehicle no-load when the outstanding drawback that the idling method detects is detection, only under idling operation, finish, therefore can only detect CO and HC, can not reflect the discharging of NOX, the car that some dischargings reach Europe 1 or Europe 2 only more than 20,000 kilometer the vehicle that travelled, loaded Working condition detecting method shows that its discharging exceeds standard, but CO and HC result that idling detects are often very low, and discharging can be up to standard.In addition, the idling method is cheating easily also, some drivers, car owner before annual test carburetor idling screw, air throttle screw to the rare partially direction adjustment of combination gas, depart from normal idling and add the rich mixture design point, after annual test is passed through, for not making the vehicle launch difficulty, again the carburetor adjustment is returned to previous status.
It is a kind of operating mode detection method that load is arranged that ASM stable state loading condition detects, and can detect the discharging of CO, HC and NOX, but two cruising modes are only arranged, and this can not reflect the actual condition of automobile when travels down comprehensively.
In addition, the result that the idling method detects and ASM stable state loading condition detects carries out at automobile exhaust pollution thing concentration of emission.Judge that with automobile exhaust pollution substrate concentration result whether motor vehicle emission exceeds standard not is scientific methods, this is because do not consider the volumetric flow rate of vehicular discharge.Influence to atmospheric pollution is the pollutant quality of vehicular discharge, and controlling elements should be the gram numbers of every kilometer discharging of each pollutant.The volumetric flow rate of the vehicular discharge that engine displacement is little is less, the volumetric flow rate of the vehicular discharge that engine displacement is big is more, the pollutant levels of the vehicular discharge that possible engine displacement is little are higher, but the pollutant of every kilometer discharging gram number is less, and the pollutant levels of the big vehicular discharge of engine displacement are lower, but the pollutant of every kilometer discharging gram number is more.The automobile of big discharge capacity should be the vehicle that exceeds standard under the normal condition, but if judge with concentration results, then might occur being judged to be adverse consequences up to standard for a short time because of an automobile with small output volume concentration is judged to be the big discharge capacity vehicle concentration that exceeds standard greatly, thereby this method is unscientific.
In sum, the domestic gasoline vehicle simple transient worknig condition tail gas pick-up unit that China's simple transient behavior pollutant emission examination criteria requires that meets that does not still have independent development, it is a technological gap.
Summary of the invention
The objective of the invention is to overcome the various defectives of prior art, make tail-gas from gasoline automobiles detect the requirement that reaches China's simple transient behavior pollutant emission examination criteria, the test operating mode that is contained more comprehensively, measuring method science more, the true emission behaviour of exhaust pollutant provides a kind of gasoline vehicle simple transient worknig condition tail gas pick-up unit when travelling under actual condition for detecting automobile exactly.
The method that a kind of gasoline vehicle simple transient worknig condition tail gas that another object of the present invention is to provide said apparatus to use detects.
For achieving the above object, gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention, comprise main control computer and the swamper's instrument and the printer that link to each other respectively with main control computer, also comprise the chassis dynamometer and the tail-gas quality analytic system that link to each other with main control computer
Chassis dynamometer is the German MAHA ASM AF of company type chassis dynamometer, and the ground mo(u)ld top half is installed, and its absorption maximum power is 110kW, the highest test speed of a motor vehicle is 160km/h, and mechanical rotation inertia is 907kg, and the test axle heavily is 2.7 tons, drive motor power is 2.2kW, and rolling simply, the footpath is 217mm;
The tail-gas quality analytic system is the U.S. VMAS of a Sensors company vehicle exhaust quality analysis system, comprises gas analyzer, the flowmeter that links to each other with gas analyzer and engine speed meter; Gas analyzer have through flexible pipe coupled, can prolong the probe that places detected Vehicular exhaust pipe; Flowmeter have through the dilution blower fan coupled, can prolong the dilution flexible pipe that places the tested vehicle offgas duct mouth of pipe; The engine speed meter has the speed probe that is contained on the tested vehicle engine ignition circuit;
Main control computer stores the sequence of operation that simple transient behavior tail gas detects, and this sequence of operation is by swamper's instrument output order, carries out that tail gas detects step under the simple transient behavior, and will detect data and export printer to.
Gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention, wherein chassis dynamometer replaces with the German MAHA ASM BF of company type chassis dynamometer, the ground mo(u)ld bottom half is installed, absorption maximum power is 110kW, the highest test speed of a motor vehicle is 160km/h, and mechanical rotation inertia is 907kg, and the test axle heavily is 2.7 tons, drive motor power is 2.2kW, and diameter of cylinder is 217mm.
Gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention, wherein chassis dynamometer replaces with the German MAHA ASM P of company type chassis dynamometer, the ground mo(u)ld bottom half is installed, absorption maximum power is 200kW, the highest test speed of a motor vehicle is 200km/h, and mechanical rotation inertia is 907kg, and the test axle heavily is 2.7 tons, drive motor power is 2.5kW, and diameter of cylinder is 217mm.
Gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention, wherein chassis dynamometer replaces with the German MAHA ASM P Plus of company type chassis dynamometer, the ground mo(u)ld bottom half is installed, absorption maximum power is 200kW, and the highest test speed of a motor vehicle is 200km/h, and mechanical rotation inertia is 907kg, the test axle heavily is 5.5 tons, drive motor has RHVC, and power is 2.5kW, and diameter of cylinder is 217mm.
Gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention, wherein speed probe is induction speed probe.
Gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention, wherein the dead ahead of tested vehicle is provided with cooling blower.
Gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention, wherein main control computer has full simplified form of Chinese Character operation control software and the RS232 serial communication interface based on the Microsoft's Window platform.
For reaching aforementioned purpose, gasoline vehicle simple transient worknig condition tail gas detection method of the present invention, pick-up unit by the swamper's instrument, chassis dynamometer and the tail-gas quality analytic system that contain main control computer, link to each other respectively with described main control computer carries out tail gas and detects, described main control computer stores the sequence of operation that simple transient behavior tail gas detects, this sequence of operation is carried out following simple transient behavior tail gas and is detected step by described swamper's instrument output order:
1) starts, carry out system's setting, comprise that the setting of equipment serial port, server setting, device authentication numbering are provided with, can change the parameter list setting;
2) System self-test comprises chassis dynamometer self check and the self check of tail-gas quality analytic system;
3) system calibrating, whether the judgment device demarcation cycle arrives, if arrive, then carries out system calibrating, comprises the demarcation of chassis dynamometer and tail-gas quality analytic system;
4), determine the loading power of chassis dynamometer and the effluent standard limit value of this tested vehicle according to the parameter information of tested vehicle;
5) this tested vehicle is carried out the 195s simple transient behavior and detect, comprise the steps:
A. main control computer is gathered the per second speed of a motor vehicle, dynamometer machine moment, engine speed, CO, CO in real time
2, HC, NO and O
2Original concentration, dilution O
2Concentration, dilution exhaust flow, temperature and pressure data;
B. dynamometer machine is loaded, monitor in real time that continuous 3 seconds of each device talk situation, the speed of a motor vehicle are overproof, speed of a motor vehicle accumulative total 15 seconds is overproof, load continuous 3 seconds overproof, load accumulative total 15 seconds overproof, to gasoline vehicle CO+CO
2＜6%, to other fuel vehicle CO+CO
2＜4%, crude sampling system low discharge, dilution natural gas gathering system low discharge, dilution ratio are crossed low situation, if the discontented sufficient requirement of arbitrary monitoring project, test restarts, and detect requirement condition until satisfying 195 seconds simple transient behaviors;
C. according to the environment weather parameter, calculate dilution correction factor DCF and humidity correction factor Kh, carry out to the corrected Calculation of CO, HC, NO original measurement concentration and air-fuel ratio calculate, to the normal flow corrected Calculation of dilution exhaust flow, by calculating dilution ratio, obtain original exhaust flow, thereby calculate per second CO, HC, NO, CO
2Mass discharge result;
D. after 195 seconds simple transient behaviors are all finished, calculate CO, HC, NO, CO under the whole working condition
2Mass discharge result, the line data of going forward side by side storage;
6) show and print the data report of this tested vehicle testing result:
A. the discharging gross mass that shows each pollutant;
B. judge that according to emission limit testing result is for " qualified " or " defective " and print examining report;
C. demonstration, playback and printing NO, CO, CO
2With 4 concentration curves of HC and 4 figure-of-merit curves, original O
2With dilution O
212 test curves such as concentration curve, actual vehicle speed curve, air-fuel ratio curve.
The advantage of gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention is with good effect: compare with existing vehicle exhaust pick-up unit such as idling method pick-up unit, ASM stable state loading condition pick-up unit, the test operating mode that is contained more comprehensively, comprise acceleration, deceleration, at the uniform velocity with various operating modes such as idling; Measuring method is science more, and surveyingpin is not only to be concentration to the quality of exhaust pollutant.The true emission behaviour of exhaust pollutant reaches the requirement of China's simple transient behavior pollutant emission examination criteria when travelling under actual condition for detecting automobile exactly, and effective detection method and pick-up unit are provided.
The present invention is further described below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the structural representation of the present invention ground mo(u)ld top half gasoline vehicle simple transient worknig condition tail gas pick-up unit;
Fig. 2 is the structural representation of the present invention ground mo(u)ld bottom half, light-duty, medium-sized gasoline vehicle simple transient worknig condition tail gas pick-up unit;
Fig. 3 is the sectional view of the German MAHA ASM AF of company type chassis dynamometer;
Fig. 4 is the vertical view of the German MAHA ASM AF of company type chassis dynamometer;
Fig. 5 is the sectional view of the German MAHA ASM BF of company type, P type chassis dynamometer;
Fig. 6 is the vertical view of the German MAHA ASM BF of company type, P type chassis dynamometer;
Fig. 7 is the sectional view of the German MAHA ASM P Plus of company type chassis dynamometer;
Fig. 8 is the vertical view of the German MAHA ASM P Plus of company type chassis dynamometer;
Fig. 9 is the pneumatic diagram of gas analyzer in the VMAS system of U.S. Sensors company;
Figure 10 is the structure principle chart of flowmeter in the VMAS system of U.S. Sensors company;
Figure 11 is a pick-up unit computing machine main flow control flow chart;
Figure 12 is a pick-up unit chassis dynamometer self check computer control process flow diagram;
Figure 13 is a pick-up unit VMAS tail gas checkout equipment self check computer control process flow diagram one;
Figure 14 is a pick-up unit VMAS tail gas checkout equipment self check computer control flowchart 2;
Figure 15 is a pick-up unit VMAS tail gas checkout equipment self check computer control flow chart 3;
Figure 16 is a pick-up unit chassis dynamometer calibrated and calculated machine control flow chart one;
Figure 17 is a pick-up unit chassis dynamometer calibrated and calculated machine control flow chart two;
Figure 18 is a pick-up unit chassis dynamometer calibrated and calculated machine control flow chart three;
Figure 19 is a pick-up unit chassis dynamometer calibrated and calculated machine control flow chart four;
Figure 20 is a pick-up unit VMAS tail gas checkout equipment calibrated and calculated machine control flow chart one;
Figure 21 is a pick-up unit VMAS tail gas checkout equipment calibrated and calculated machine control flow chart two;
Figure 22 is 195 seconds simple transient behavior test computers of pick-up unit control flow chart one;
Figure 23 is 195 seconds simple transient behavior test computers of pick-up unit control flow chart two.
Embodiment
With embodiment the technical scheme and the detection method of gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention are elaborated below.
For convenience's sake, list as follows earlier: in Fig. 1-Figure 10,1. dilute blower fan to the mark of accompanying drawing, 2. five gas analyzers 3. dilute flexible pipe, 4. air compressor, 5.MAHA ASM series chassis dynamometer, 6. springboard, 7. cooling blower, 8. swamper's instrument, 9. tested automobile, 10. printer, 11. main control computer, 12. engine speed meters, 13. flowmeters, 14.Sensors VMAS vehicle exhaust quality analysis system, 15. the position-limited wheel hole, 16. left master rotors, 17. driving motors, 18. left and right sides master rotor shaft coupling, 19. lifting jack, 20. right master rotors, 21. shaft couplings, 22. eddy current absorption dynamometer, 23. flywheel, 24. major-minor drum belt gearings, 25. right auxiliary cylinders, 26. direct motor drive shaft coupling, 27. left auxiliary cylinder, 28. speed probes, 29. position-limited wheels, 30. scaffold, 31. inter panel, 32. coupling bolts, 33. sample gas inlet, 34. threeway, 35. filter cleaner, 36. unwatering pumps, 37. drain outlets, 38. vacuum pressure switch, 39. threeway, 40. aspiration pumps, 41. two-position three way magnetic valves, 42. filter cleaner, 43.O
2Sensor, 44. threeways, the outlet of 45. sample gas, the outlet of 46. sample gas, 47.NO sensor, 48. pressure transducers, 49. threeways, 50.CO, CO
2With the HC sensor, 51. high standard fixed end mouths, the 52. low ports of demarcating, 53. zero gas is demarcated port, 54. ambient air inlet, 55. filter cleaners, 56. two-position three way magnetic valve, 57. two-position three way magnetic valves, 58. two-position three way magnetic valves, 59. two-position three way magnetic valve, 60. threeways, 61. condensers, 62. threeway, 63. moisture traps, 64. flowmeter airflow lines, 65. flow sensor piezoelectric crystal (transmitter and receiver), 66. the flow-disturbing bar, 67. air-flow stopple coupons, 68. sampling air chambers, 69. zirconia sensor, 70. gas circuit, 71. temperature sensors, 72. pressure transducers, 73. microprocessor unit, the 74.RS-232 communication interface; In Fig. 8,321. variable-frequence governors.
Referring to Fig. 1 and Fig. 2, the gasoline vehicle simple transient worknig condition tail gas pick-up unit, comprise main control computer 11 with its swamper's instrument 8 that links to each other respectively and printer 10, also comprise coupled chassis dynamometer 5 and tail-gas quality analytic system 14.In detection, cooling blower 7 is positioned at the dead ahead of tested vehicle 9, and swamper's instrument 8 is positioned at the front upper place of tested vehicle 9.Chassis dynamometer 5 is the German MAHA ASM of company series chassis dynamometer.Tail-gas quality analytic system 14 is the U.S. VMAS of a Sensors company vehicle exhaust quality analysis system, and tail-gas quality analytic system 14 comprises gas analyzer 2, coupled flowmeter 13 and engine speed meter 12.Gas analyzer 2 have through flexible pipe coupled, can prolong the probe that places detected Vehicular exhaust pipe.Flowmeter 13 have through dilution blower fan 1 coupled, can prolong near the dilution flexible pipe 3 that places the tested vehicle offgas duct.Engine speed meter 12 has the speed probe that is contained on the tested vehicle engine ignition circuit.Speed probe 12 is induction speed probe.
In first embodiment of gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention, referring to Fig. 3-Fig. 4, the master of chassis dynamometer 5, auxiliary cylinder 16,20,25 and 27 by bearings on framework 30, a left side, right master rotor 16 and 20 connects together by shaft coupling 21, auxiliary cylinder 25 and 27 connects together by drive motor 17 and shaft coupling 26, main, auxiliary cylinder links by belt transmission 24, eddy current absorption dynamometer 22 links by shaft coupling 21 and master rotor, speed probe 28 is installed in the outer end of master rotor 16, framework 30 both sides respectively have 5 holes 15, are used to install position-limited wheel 29.When tested vehicle moves, need overcome the braking power that applies by eddy current absorption dynamometer 22 on cylinder, measure the speed of cylinder by speed probe 28.
The Germany MAHA ASM of company series chassis dynamometer adopts the AF type, and the ground mo(u)ld top half is installed, and its absorption maximum power is 110kW, the highest test speed of a motor vehicle is 160km/h, and mechanical rotation inertia is 907kg, and the test axle heavily is 2.7 tons, drive motor power is 2.2kW, and diameter of cylinder is 217mm.
Referring to Fig. 9, when measuring the exhaust pollutant concentration of emission, tail gas sample gas enters moisture trap 63 from sample gas inlet 33, enters CO, CO by aspiration pump 40 suctions through two-position three way magnetic valve 59 and 41, threeway 62,60 and 39, condenser 61, filter cleaner 42
2Measure these three kinds of pollutant levels with HC sensor 50, behind threeway 49 and 44, enter O respectively again
2Sensor 43 and NO sensor 47 are measured O
2With the concentration of NO, the sample gas of measured mistake outside exporting 45 and 46 discharge machines, unwatering pump 36 runnings simultaneously, isolated water through threeway 34, filter cleaner 35 with export outside the 37 discharge machines.High range standard gas timing signal, solenoid valve 56,57,58 and 59 powers on, connected the gas circuit of high standard fixed end mouth 51 with each sensor, high range standard gas enters from high standard fixed end mouth 51, demarcates through the concentration that aspiration pump 40, solenoid valve 41 and filter cleaner 42 successively enter CO, CO2 and HC sensor 50, O2 sensor 43 and NO sensor 47 couples of CO, CO2, HC, NO and O2.Lower range standard gas timing signal, solenoid valve 56,57 and 59 powers on, connected the gas circuit of low demarcation port 52 and each sensor, lower range standard gas enters the concentration that successively enters CO, CO2 and HC sensor 50, O2 sensor 43 and NO sensor 47 couples of CO, CO2, HC, NO and O2 through aspiration pump 40, solenoid valve 41 and filter cleaner 42 from low demarcation port 52 and demarcates.Zero standard gas timing signal, solenoid valve 56 and 59 powers on, and has connected the gas circuit of zero gas demarcation mouth 53 and each sensor, and zero standard gas enters through aspiration pump 40, solenoid valve 41 and filter cleaner 42 priorities from demarcation mouth 53 and enters CO, CO
2With HC sensor 50, O
247 pairs of zero gas of sensor 43 and NO sensor are demarcated.During the surrounding air measurement, solenoid valve 59 powers on, and has connected the gas circuit of surrounding air measurement mouth 54 with each sensor, and surrounding air enters through aspiration pump 40, solenoid valve 41, filter cleaner 42 and 55 priorities from measurement mouth 54 and enters CO, CO
2With HC sensor 50, O
2Sensor 43 and NO sensor 47 couples of CO, CO
2, HC, O
2Measure with the concentration of NO.
Referring to Figure 10, enter into flowmeter airflow line 64 by dilution blower fan 1 through the diluents of dilution flexible pipe 3 suction, form stable dilution air flow, dilution air flow is subjected to the interference of flow-disturbing bar 66, alternately produce two from flow-disturbing bar 66 both sides and show regular vortex, vortex frequency is converted to the voltage pulse signal that is directly proportional with flow by flow sensor piezoelectric crystal 65, record instantaneous actual flow, simultaneous temperature sensor 71 measures the temperature of diluents, pressure transducer 72 measures the pressure of diluents, be used for basis of calculation gas flow, zirconia sensor 69 is by air-flow stopple coupon 67, sampling air chamber 68 and gas circuit 70 measure O in the diluents
2Concentration.
In the embodiment of pick-up unit, main control computer 11 stores the sequence of operation that simple transient behavior tail gas detects, this sequence of operation is carried out tail gas detection step under the simple transient behavior by swamper's instrument 8 output orders, and exports the data of testing result to printer 10.Main control computer 11 has full simplified form of Chinese Character operating system and the RS232 serial communication interface based on the Microsoft's Window platform.
The sequence of operation that following emphasis is carried out with software illustrates the Device Testing process:
Referring to Figure 11, main control computer 11 is according to the step of the tail gas detecting operation sequence of storage, be provided with equipment serial port, server, device authentication numbering and can changing parameter list (after the step 1), at first chassis dynamometer 5 and tail-gas quality analytic system 14 are carried out System self-test (step 2) respectively, and as required chassis dynamometer 5 and tail-gas quality analytic system 14 are demarcated (step 3), then according to typing tested vehicle information, determine the loading power of eddy current absorption dynamometer of chassis dynamometer 5 and the effluent standard limit value (step 4) of vehicle.Tested vehicle moves (step 5) with the 195s simple transient behavior on chassis dynamometer, after operating mode detects and finishes smoothly, show the discharging gross mass of each pollutant, judge and provide testing result according to emission limit to be " qualified " or " defective ", and the printing examining report, NO, CO, CO
2With 4 concentration curves of HC and 4 figure-of-merit curves, original O
2With dilution O
212 test curve playback such as concentration curve, actual vehicle speed curve, air-fuel ratio curve and printing (step 6).Afterwards, tested vehicle withdraws from chassis dynamometer 5, or carries out next car discharging and detect, or closes detection system.
Wherein, the chassis dynamometer self check comprises the steps:
A. serial communication detects;
B. the lifting jack lifting action detects;
C. the direct motor drive cylinder rotates test;
D. speed probe speed detects.
Referring to Figure 12, in definite communication system operate as normal (after the step a), the lifting jack 19 that drives chassis dynamometer 5 produces lifting action (step b), start driving motor 17 and drive left master rotor 16, right master rotor 20 rotation (step c), the rotary speed data (step d) of testing speed probe 28 simultaneously.
The self check of VMAS tail gas detection system comprises the steps:
A. serial communication detects;
B. preheating detects;
C. Leak Detection;
D.CO, CO
2, HC, NO and O
2Zeroing;
E.O
2Range designation;
F. the environmental background air is measured and the measurement of HC residual quantity;
G. flowmeter flow detection;
H. zirconia sensor environment O
2Test.
Referring to Figure 13～Figure 15, in definite communication system operate as normal (after the step a), checkout equipment preheating situation is until five gas analyzers, 2 abundant preheating (step b), after prompting operation person seals the sampling probe inlet that sampling system is connected in automobile tail gas pipe, open aspiration pump 40 work and stop 30 seconds again after 30 seconds, computing machine 11 detects vacuum pressure switch 38 status datas, if maintenance vacuum state, illustrate that the gas sampling passage does not have leakage phenomenon and can work on, otherwise (step c), computing machine 11 are opened zero gas demarcation port 53 through two-position three way magnetic valve 57 to stop to continue detection, two-position three way magnetic valve 56, two-position three way magnetic valve 59, aspiration pump 40, two-position three way magnetic valve 41 enters CO, CO
2With HC sensor 50, O
2The passage of sensor 43 and NO sensor 47 inserts bottled standard zero gas and carries out CO, CO
2, HC, NO, O
2(step d), after zeroing finished, computing machine 11 prompting operation persons withdrew zero gas cylinder, insert bottled standard O in zeroing
2Or fresh air carries out O
2Range designation (step e), after demarcate finishing, open sample gas inlet 33 and enter CO, CO through moisture trap 63, condenser 61, two-position three way magnetic valve 59, aspiration pump 40, two-position three way magnetic valve 41 by computing machine 11
2With HC sensor 50, O
2The passage of sensor 43 and NO sensor 47, whether measurement concentration value of HC, CO and NO in the surrounding air of sampling probe exceeds standard, if any one index exceeding standard then system stop to continue to detect, computing machine 11 is opened surrounding air ports 54 and is entered CO, CO through two-position three way magnetic valve 56, two-position three way magnetic valve 59, aspiration pump 40, two-position three way magnetic valve 41 then
2With HC sensor 50, O
2The passage of sensor 43 and NO sensor 47, measurement is without the concentration value of HC in the surrounding air of sampling probe, calculate front poor through the surrounding air HC value of sampling probe and this HC value, system stops continue to detect that (step f), next computing machine 11 is by the gas flow and the environment O of flow sensor 65 and 10 seconds the airflow line 64 of flowing through of zirconia sensor 69 continuous acquisition if difference exceeds standard
2Data, calculating mean value is judged gas flow and environment O
2Whether value is in the specification error scope (step g, h), if incorrect then stop to continue to detect.
Whether arrived all after dates of demarcation in judgment device, if arrive, then carried out system calibrating, the demarcation of chassis dynamometer 5 comprises the steps:
A. pressure sensor calibrating;
B. speed probe is demarcated;
C. unloaded resistance of taxing detects;
D. load and slide test;
E. variable load slides test.
Referring to Figure 16～Figure 19, demarcate content and comprise that (((test is slided in step c), loading, and (step d) and variable load slide test (5 parts such as step e) to pressure sensor calibrating for step b) and the detection of unloaded resistance of taxing for step a), speed probe demarcation.Force sensor caliberating adopts counterweight, leverage, computing machine 11 guiding operation persons return to zero successively, the thick demarcation and smart the demarcation, and control chassis dynamometer 5 carries out the calibration compensation adjusting, speed probe is demarcated and is adopted the rated rotational frequency table, after computing machine 11 prompting drivers accelerate to the set appointment speed of a motor vehicle with tested vehicle 9, keep throttle constant, after the speed of a motor vehicle is stable, prompting operation person imports the rated rotational frequency of rated rotational frequency meter, behind the rotary drum rotating speed and rated rotational frequency contrast of computing machine 11 with measurement, judge whether the rotating speed demarcation is passed through, when unloaded resistance of taxing detects, after computing machine 11 accelerates to 60km/h with chassis dynamometer 5, the beginning coasting test, measured 55km/h～45km/h respectively, 48km/h～32km/h, 35km/h～29km/h, 32km/h～16km/h, the coasting time of 19km/h～13km/h, calculate the parasitic power value of corresponding chassis dynamometer 5, when test is slided in loading, after the range of speeds that computing machine 11 is set according to the operator accelerates to certain speed with chassis dynamometer 5, the beginning coasting test, sliding computer-chronograph 11 loads according to the power that the operator sets, measure the coasting time of chassis dynamometer 5 simultaneously, by comparing with the object time of Theoretical Calculation, calculate error rate, if error rate is less than 7%, loading is slided test and is passed through, otherwise test failure, when variable load slides test, after computing machine 11 accelerates to the set speed of a motor vehicle with chassis dynamometer 5 earlier, automatically carry out the varying load coasting test then, respectively measurements and calculations 80.5km/h～8.0km/h, 72.4km/h～16.1km/h, 61.1km/h theory target time and the coasting time of～43.4km/h, calculate error rate, judge to detect and whether pass through.
VMAS tail gas detection system is demarcated and is comprised the steps:
A.O
2Range designation;
B.CO, CO
2, HC, NO high range demarcate;
C.CO, CO
2, HC, NO lower range demarcate;
D. zirconia sensor environment O
2Test.
Referring to Figure 20～Figure 21, demarcate content and comprise O
2Sensor single-point calibration (step a), CO, CO
2, HC, NO sensor high range demarcate and lower range is demarcated (step b, c), zirconia sensor is demarcated (step d).O
2During the sensor single-point calibration, computing machine 11 is opened zero gas demarcation port 53 and is entered CO, CO through two-position three way magnetic valve 57, two-position three way magnetic valve 56, two-position three way magnetic valve 59, aspiration pump 40, two-position three way magnetic valve 41
2With HC sensor 50, O
2The passage of sensor 43 and NO sensor 47, zero gas is demarcated port 53 and is inserted fresh air or bottled standard O
2, start O
2The range designation program is demarcated, CO, CO
2, HC, NO sensor the high range timing signal, computing machine 11 is opened high standard fixed end mouths 51 and is entered CO, CO through two-position three way magnetic valve 58, two-position three way magnetic valve 57, two-position three way magnetic valve 56, two-position three way magnetic valve 59, aspiration pump 40, two-position three way magnetic valve 41
2With HC sensor 59, O
2The passage of sensor 43 and NO sensor 47, high standard fixed end mouth 51 inserts bottled standard high standard CO, CO
2, HC, NO gas, computing machine 11 starts the high standard calibrating procedures and demarcates CO, CO
2, HC, NO sensor the lower range timing signal, computing machine 11 is opened the low port 52 of demarcating and is entered CO, CO through two-position three way magnetic valve 58, two-position three way magnetic valve 57, two-position three way magnetic valve 56, two-position three way magnetic valve 59, aspiration pump 40, two-position three way magnetic valve 41
2With HC sensor 50, O
2The passage of sensor 43 and NO sensor 47, the low port 52 of demarcating inserts the low mark of bottled standard CO, CO
2, HC, NO gas, computing machine 11 starts low mark calibrating procedure to be demarcated, the zirconia sensor timing signal, dilution blower fan 1 is in running order, fresh air is inhaled into airflow line 64, behind the steady air current, computing machine 11 starts the zirconia calibrating procedures and demarcates.
According to the parameter information of tested vehicle, determine the effluent standard limit value of the loading power of chassis dynamometer and vehicle after, carry out the 195s simple transient behavior and detect.Referring to Figure 22～Figure 23, main control computer 11 shows that in the rolling picture mode (step a), main control computer 11 is gathered the per second speed of a motor vehicle, dynamometer machine moment, engine speed, CO, CO to the operating condition of test curve in real time by swamper's instrument 8
2, HC, NO and O
2Original concentration, dilution O
2Concentration, dilution exhaust flow, temperature and pressure data and to dynamometer machine load (step b), simultaneously overproof, the speed of a motor vehicle accumulative total of continuous 3 seconds of 11 pairs of each device talk situations of main control computer, the speed of a motor vehicle 15 seconds overproof, load continuous 3 seconds overproof, load accumulative total 15 seconds overproof, to gasoline vehicle CO+CO
2＜6%, to other fuel vehicle CO+CO
2＜4%, crude sampling system low discharge, dilution natural gas gathering system low discharge, dilution ratio is crossed low situation and is monitored in real time, if the discontented sufficient requirement of arbitrary monitoring project, the simple transient behavior test restarts, detect requirement condition (step c) until satisfying 195 seconds simple transient behaviors, according to the environment weather parameter, calculate dilution correction factor DCF and humidity correction factor Kh, and then to CO, HC, the corrected Calculation of NO original measurement concentration and air-fuel ratio are calculated, next the dilution exhaust flow is made the normal flow corrected Calculation, by calculating dilution ratio, obtain original exhaust flow result, thereby calculate per second CO, HC, NO, CO
2Mass discharge result (step d) after simple transient behavior was all finished in 195 seconds, can calculate CO under the whole working condition, HC, NO, CO
2Mass discharge result, the line data of going forward side by side storage (step e).
In second embodiment of gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention, referring to Fig. 5～Fig. 6, adopt the German MAHA ASM BF of company type chassis dynamometer, the ground mo(u)ld bottom half is installed, and absorption maximum power is 110kW, and the highest test speed of a motor vehicle is 160km/h, mechanical rotation inertia is 907kg, the test axle heavily is 2.7 tons, and drive motor power is 2.2kW, and diameter of cylinder is 217mm.
In the 3rd embodiment of gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention, referring to Fig. 5～Fig. 6, adopt the German MAHA ASM P of company type chassis dynamometer, the ground mo(u)ld bottom half is installed, and absorption maximum power is 200kW, and the highest test speed of a motor vehicle is 200km/h, mechanical rotation inertia is 907kg, the test axle heavily is 2.7 tons, and drive motor power is 2.5kW, and diameter of cylinder is 217mm.
In the 4th embodiment of gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention, referring to Fig. 7～Fig. 8, adopt the German MAHA ASM P Plus of company type chassis dynamometer, the ground mo(u)ld bottom half is installed, and absorption maximum power is 200kW, the highest test speed of a motor vehicle is 200km/h, mechanical rotation inertia is 907kg, and the test axle is 5.5 tons heavily, and drive motor has RHVC, power is 2.5kW, and diameter of cylinder is 217mm.
Second to the 4th embodiment of gasoline vehicle simple transient worknig condition tail gas pick-up unit of the present invention, the working method of pick-up unit is identical, repeats no more.
Claims (8)
1. gasoline vehicle simple transient worknig condition tail gas pick-up unit, comprise main control computer (11) and the swamper's instrument (8) and the printer (10) that link to each other respectively with described main control computer (11), it is characterized in that: also comprise the chassis dynamometer (5) and the tail-gas quality analytic system (14) that link to each other with described main control computer (11)
Described chassis dynamometer (5) is the German MAHA ASM AF of company type chassis dynamometer, and the ground mo(u)ld top half is installed, and its absorption maximum power is 110kW, the highest test speed of a motor vehicle is 160km/h, and mechanical rotation inertia is 907kg, and the test axle heavily is 2.7 tons, drive motor power is 2.2kW, and diameter of cylinder is 217mm;
Described tail-gas quality analytic system (14) is the U.S. VMAS of a Sensors company vehicle exhaust quality analysis system, comprises gas analyzer (2), the flowmeter (13) that links to each other with described gas analyzer (2) and engine speed meter (12); Described gas analyzer (2) have through flexible pipe coupled, can prolong the probe that places detected vehicle (9) offgas duct; Described flowmeter (13) have through the dilution blower fan (1) coupled, can prolong the dilution flexible pipe (3) that places tested vehicle (9) the offgas duct mouth of pipe; Described engine speed meter (12) has the speed probe that is contained on the tested vehicle engine ignition circuit;
Described main control computer (11) stores the sequence of operation that simple transient behavior tail gas detects, this sequence of operation is by described swamper's instrument (8) output order, under different simple transient behaviors, carry out some tail gas and detect step, and export the data of testing result to described printer (10).
2. gasoline vehicle simple transient worknig condition tail gas pick-up unit according to claim 1, wherein said chassis dynamometer (5) replaces with German MAHA ASM BF type chassis dynamometer, the ground mo(u)ld bottom half is installed, absorption maximum power is 110kW, the highest test speed of a motor vehicle is 160km/h, and mechanical rotation inertia is 907kg, and the test axle heavily is 2.7 tons, drive motor power is 2.2kW, and diameter of cylinder is 217mm.
3. gasoline vehicle simple transient worknig condition tail gas pick-up unit according to claim 1, wherein said chassis dynamometer (5) replaces with German MAHA ASM P type chassis dynamometer, the ground mo(u)ld bottom half is installed, absorption maximum power is 200kW, the highest test speed of a motor vehicle is 200km/h, and mechanical rotation inertia is 907kg, and the test axle heavily is 2.7 tons, drive motor power is 2.5kW, and diameter of cylinder is 217mm.
4. gasoline vehicle simple transient worknig condition tail gas pick-up unit according to claim 1, wherein said chassis dynamometer (5) replaces with German MAHA ASM P Plus type chassis dynamometer, the ground mo(u)ld bottom half is installed, absorption maximum power is 200kW, and the highest test speed of a motor vehicle is 200km/h, and mechanical rotation inertia is 907kg, the test axle heavily is 5.5 tons, drive motor has RHVC, and power is 2.5kW, and diameter of cylinder is 217mm.
5. according to claim 1 or 2 or 3 or 4 described gasoline vehicle simple transient worknig condition tail gas pick-up units, wherein said speed probe is induction speed probe.
6. gasoline vehicle simple transient worknig condition tail gas pick-up unit according to claim 5, the dead ahead of wherein said tested vehicle are provided with cooling blower (7).
7. gasoline vehicle simple transient worknig condition tail gas pick-up unit according to claim 6, wherein said main control computer (11) have full simplified form of Chinese Character operation control software and the RS232 serial communication interface based on the Microsoft's Window platform.
8. the method that detects of gasoline vehicle simple transient worknig condition tail gas, it is characterized in that: the pick-up unit of this method by the swamper's instrument that contains main control computer, link to each other respectively with described main control computer, the German MAHA ASM of company series chassis dynamometer and the U.S. VMAS of Sensors company tail-gas quality analytic system carries out tail gas and detects, described main control computer stores the sequence of operation that simple transient behavior tail gas detects, this sequence of operation is carried out following simple transient behavior tail gas and is detected step by described swamper's instrument output order;
1) starts, carry out system's setting, comprise that the setting of equipment serial port, server setting, device authentication numbering are provided with, can change the parameter list setting;
2) System self-test comprises described chassis dynamometer self check and the self check of described VMAS vehicle exhaust quality analysis system;
3) system calibrating, whether the judgment device demarcation cycle arrives, if arrive, then carries out system calibrating, comprises that described chassis dynamometer is demarcated and described VMAS vehicle exhaust quality analysis system is demarcated;
4), determine the loading power of described chassis dynamometer and the effluent standard limit value of this tested vehicle according to the parameter information of tested vehicle;
5) this tested vehicle is carried out the 195s simple transient behavior and detect, comprise the steps:
A. performance curve and tolerance range curve determines;
B. dynamometer machine is loaded, main control computer is gathered the per second speed of a motor vehicle, dynamometer machine moment, engine speed, CO, CO in real time
2, HC, NO and O
2Original concentration, dilution O
2Concentration, dilution exhaust flow, temperature and pressure data;
C. monitor in real time that continuous 3 seconds of each device talk situation, the speed of a motor vehicle are overproof, speed of a motor vehicle accumulative total 15 seconds is overproof, load continuous 3 seconds overproof, load accumulative total 15 seconds overproof, to gasoline vehicle CO+CO
2＜6%, to other fuel vehicle CO+CO
2＜4%, crude sampling system low discharge, dilution natural gas gathering system low discharge, dilution ratio are crossed low situation, if the discontented sufficient requirement of arbitrary monitoring project, test restarts, and detect requirement condition until satisfying 195 seconds simple transient behaviors;
D. according to the environment weather parameter, calculate dilution correction factor DCF and humidity correction factor Kh, carry out to the corrected Calculation of CO, HC, NO original measurement concentration and air-fuel ratio calculate, to the normal flow corrected Calculation of dilution exhaust flow, by calculating dilution ratio, obtain original exhaust flow, thereby calculate per second CO, HC, NO, CO
2Mass discharge result;
E. after 195 seconds simple transient behaviors are all finished, calculate CO, HC, NO, CO under the whole working condition
2Mass discharge result, the line data of going forward side by side storage;
6) show and print the data report of this tested vehicle testing result:
A. the discharging gross mass that shows each pollutant;
B. judge that according to emission limit testing result is for " qualified " or " defective " and print examining report;
C. demonstration, playback and printing NO, CO, CO
2With 4 concentration curves of HC and 4 figure-of-merit curves, original O
2With dilution O
212 test curves such as concentration curve, actual vehicle speed curve, air-fuel ratio curve.
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