CN1865880A - Measurement method and device for vehicular reaction type brake tester - Google Patents
Measurement method and device for vehicular reaction type brake tester Download PDFInfo
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- CN1865880A CN1865880A CN 200610088043 CN200610088043A CN1865880A CN 1865880 A CN1865880 A CN 1865880A CN 200610088043 CN200610088043 CN 200610088043 CN 200610088043 A CN200610088043 A CN 200610088043A CN 1865880 A CN1865880 A CN 1865880A
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Abstract
The disclosed testing method for vehicle reaction type brake bench comprises: fitting two braking force curves by computer, generating electric signal varied with time by means of DAC, adjusting the amplitude and impedance of signal to match with the signal from bench sensor; sending obtained two path signal to bench measuring system; comparing the result from former measuring system and known parameters to obtain the system error. This invention is efficient to both static and dynamic signal.
Description
Technical field
The present invention relates to a kind of method of testing of motor vehicle brake inspection equipment, be specifically related to a kind of method that vehicular reaction type brake tester is tested of being used for.
Background technology
The detection of automobile brake perfrmance as one of most important project in the information of safety inspection for motor vehicles, is the focus that people pay close attention to always.At present, domestic a large amount of uses be that drum reaction type is automobile brake test bed, generally adopt Computer Control Technology to carry out the collection and the processing of damping force data.For example, common single shaft anti-force rolling brake testing platform by identical in structure about two cover wheel damping force test cells and a cover indication control device form.Every suit wheel braking force test cell is by formations such as framework (testing table that has is made one with left and right sides test cell by framework), drive unit, cylinder group, lifting device, measurement mechanisms.Braking force measuring apparatus wherein mainly is made up of dynamometry lever and sensor, dynamometry lever one end is connected with sensor, the other end is connected with reducer shell, the dynamometry lever will be swung around drive roll (or around reducer output shaft, motor shaft) axis with reducer shell during tested wheel braking, that sensor transmits the dynamometry lever, be transformed into electric signal and be transported to indication, control device with the proportional power of damping force (or displacement), sensor has polytypes such as strain force-measuring type, selsyn motor formula, potentiometer type, differential transformer type.
In the data acquisition of damping force, be to obtain each collection point damping force numerical value with certain sampling rate, in this process, because the machine work precision causes the parasitic disturbances that sensor vibration and electronic circuit are introduced, can make the jitter that measures, and causing that measured value beats, undesired signal is superimposed upon on the damping force signal, forms on squiggle " burr ".Therefore, in the telemetry circuit and software of reality, filtering circuit and smoothing algorithm have been added to some extent, so that the output numeral is stable.
At present, metrological service is to the calibration check of motor vehicle brake tester, what adopt is the method for static demarcating, the measuring system that is brake tester enters " demarcation " state, to the force cell loading of brake tester, and is stabilized in a fixed numbers as standard value, the measuring system of brake tester measures measured value to this power, with standard value relatively, if relative error in ± 5%, it is qualified that this brake tester is.
Yet in the practical operation of inspection car, the speed difference that the driver touches on the brake makes the rise time of damping force not wait between second at 0.3-8, and promptly the damping force of brake tester actual loaded is dynamic.After through above-mentioned filtering circuit and level and smooth software processes, the damping force maximal value that measures has been subjected to loss, signal waveform is referring to shown in the accompanying drawing 1, wherein, solid line is the damping force signal of sensor output, dotted line is filtering, signal after the smoothing processing, in some systems, peaked loss reaches more than 30%, and, the size of loss is relevant with the speed (speed that promptly touches on the brake) that damping force rises, thereby, though that brake tester is demarcated when static state is qualified, under the current intelligence of actual detected, because the difference of operation and handling procedure is different, can reduce the actual test value of damping force to some extent.
On the other hand, because metrological service can't carry out dynamic calibration to brake tester at present, manufacturer provides two states at present, promptly demarcate state and measurement state, might cause manufacturer to use two kinds of different programs, calibrating procedure is dealt with metering inspection, and process of measurement is then unfettered.Sending out in the practice manufacturer existing is provided with a coefficient in process of measurement, can export the result by coefficient adjustment under the situation of identical damping force, obtains different test values.
Moreover according to the regulation of GB7258-2004, brake tester needs the while testing process poor, and promptly the maximum difference of the same axle of automobile left and right wheels in damping force rises crossed serious consequences such as breakking away, spin when the excessive meeting of path difference causes car brakeing.Yet present static demarcating method can't be demarcated the mistake path difference of brake tester.
Summary of the invention
The object of the invention provides a kind of method of testing of vehicular reaction type brake tester, can realize the dynamic test and the demarcation of motor vehicle brake tester, realizes damping force is crossed the mensuration of path difference simultaneously.
Another object of the present invention provides a kind of device that adopts this method of testing to realize motor vehicle brake tester dynamic test.
For achieving the above object, the technical solution used in the present invention is: a kind of method of testing of vehicular reaction type brake tester, and the left and right of corresponding motor vehicle taken turns respectively, adopts two brake application curves of computer fitting; Utilize the digital-to-analog conversion mode to generate time dependent electric signal, adjust the amplitude and the impedance of electric signal, make it sensor output signal coupling with tested testing table according to described brake application curve; The two path signal that obtains is sent into measuring system through the left and right sensing circuit of taking turns of testing table respectively; The relevant parameter of result that bench measuring system is recorded and known brake application curve compares, and the error of calibrating measuring system realizes the test to vehicular reaction type brake tester.
In the technique scheme, " two brake application curve " of described match can generate according to the left and right skidding force curve statistics of taking turns of vehicle in the actual measurement, also different curves can be set, and examines the different index of brake tester.Utilize the digital-to-analog conversion mode to obtain electric signal by this curve setting, after adjusting range and impedance, insert the sensor output terminal, substitute actual sensor output signal with this, at this moment, in fact sensor output signal constitutes addition with the match signal and is connected, thereby it is unborn by the undesired signal that forms before the sensor can not influence testing table.With this, obtain dynamic test result.During contrast, the corresponding parameter of two curves can be compared, also can estimate important indicators such as the sample frequency that brake tester and single-point repeatability,, can also be used for test bed crossing the detection case of path difference by changing the mutual relationship of two curves.
Optimized technical scheme, described brake application curve set in advance and are stored in the computing machine, during test, show curve on computers earlier, adopt corresponding curve data after selecting.
Adopt above-mentioned method of testing, a kind of proving installation of vehicular reaction type brake tester can be provided, comprise computing machine and marking apparatus, be connected by communication interface between described computing machine and marking apparatus, described marking apparatus is made of microprocessor, the communication interface circuit that is connected with the input/output port of microprocessor, 2 road curve fitting circuit, and described each curve fitting circuit comprises D/A switch circuit, amplitude regulating circuit and the impedance matching circuit that is connected with the output port of microprocessor.
In the technique scheme, described computing machine is used to carry out the default of curve and select, and usually, it can realize following function by software setting: the default and storage of curve; The demonstration of curve and selection; Curve data is sent to marking apparatus.Marking apparatus then is used for changing default curve into electric signal, at first pass through communication interface, obtain curve data from computing machine (host computer), by microprocessor processes, data with two curves are sent to two-way curve fitting circuit respectively, microprocessor can send the numerical value that changes according to the matched curve data, become simulating signal by the D/A switch circuit conversion, by amplitude regulating circuit and impedance matching circuit it is adjusted into the electric signal that mates with sensor output signal again, exports the output terminal of left and right wheel sensor respectively to.According to digital signal match simulating signal curve, can adopt prior art, those skilled in the art can know output how to adjust digital-to-analog conversion according to the testing table of correspondence, makes it sensing amplitude and impedance matching with testing table.
Wherein, described communication interface adopts USB port; Perhaps, described communication interface adopts parallel interface; Also can adopt RS232 or other serial line interface.
Because the technique scheme utilization, the present invention compared with prior art has following advantage:
1. because having adopted at sensor, the present invention exports the method that adds the electric signal that meets known brake application curve between the transducing signal input to, realized dynamic test to vehicular reaction type brake tester, changed the present situation that to carry out static test at present, it is skillfully constructed, and is creative;
2. the present invention can carry out the test of path difference, and having solved at present can't be to crossing the problem that path difference is demarcated;
3. adopt the present invention to be used for the demarcation of brake tester, can directly examine and determine the process of measurement of brake tester, measure the error of brake tester under various states truly, solved the present domestic problem that can't carry out dynamic calibration to the brake tester measuring system of each manufacturers produce, thereby changed present domestic each testing agency of causing because of electrical measurement and even same mechanism the inconsistent situation of car brakeing power test result.
Description of drawings
Accompanying drawing 2 is the proving installation structured flowchart of the embodiment of the invention one;
Accompanying drawing 3 is the program function block diagram in the computing machine among the embodiment one;
Accompanying drawing 4 is the circuit theory synoptic diagram of marking apparatus among the embodiment one.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment one: referring to accompanying drawing 2 to shown in the accompanying drawing 4, a kind of proving installation of vehicular reaction type brake tester, comprise computing machine and marking apparatus, be connected by communication interface between described computing machine and marking apparatus, described marking apparatus is made of microprocessor, the communication interface circuit that is connected with the input/output port of microprocessor, 2 road curve fitting circuit, and described each curve fitting circuit comprises D/A switch circuit, amplitude regulating circuit and the impedance matching circuit that is connected with the output port of microprocessor.
In the present embodiment, described communication interface adopts USB port.
In advance computing machine is carried out the curve setting, and with profile memory in the external storage of computing machine, during use, start computer program, trade-off curve, show corresponding curve, after determining the two-way curve data is sent to marking apparatus by USB port respectively, the microprocessor in the marking apparatus is sent to 2 road curve fitting circuit according to the time interval of setting respectively with curve data; Utilize the digital-to-analog conversion mode to generate time dependent electric signal, adjust the amplitude and the impedance of electric signal, make it sensor output signal coupling with tested testing table according to described brake application curve; The two path signal that obtains is sent into measuring system through the left and right sensing circuit of taking turns of testing table respectively; The relevant parameter of result that bench measuring system is recorded and known brake application curve compares, and the error of calibrating measuring system realizes the test to vehicular reaction type brake tester.
Referring to accompanying drawing 4, in the present embodiment, can select the microprocessor of 8031 single-chip microcomputers for use, utilize multi-disc latch 74LS373 and special-purpose USB interface chip USB100 to constitute the bus transfer structure of single-chip microcomputer as marking apparatus, code translator 74LS138 is used to export chip selection signal, and 6264 as program storage; Constitute the D/A switch circuit by 2 16 D/A chip DAC712P respectively, the operational amplifier OP-07 that utilizes negative feedback to be provided with constitutes amplitude regulating circuit, in 2 tunnel outputs, constitute impedance matching circuit by resistance R 9, R10, R11 and resistance R 21, R22, R23 respectively.
Claims (6)
1. the method for testing of a vehicular reaction type brake tester, it is characterized in that: the left and right of corresponding motor vehicle taken turns respectively, adopts two brake application curves of computer fitting; Utilize the digital-to-analog conversion mode to generate time dependent electric signal, adjust the amplitude and the impedance of electric signal, make it sensor output signal coupling with tested testing table according to described brake application curve; The two path signal that obtains is sent into measuring system through the left and right sensing circuit of taking turns of testing table respectively; The relevant parameter of result that bench measuring system is recorded and known brake application curve compares, and the error of calibrating measuring system realizes the test to vehicular reaction type brake tester.
2. the method for testing of vehicular reaction type brake tester according to claim 1, it is characterized in that: described brake application curve sets in advance and is stored in the computing machine, during test, shows curve on computers earlier, adopts the curve data of correspondence through selecting after.
3. the proving installation of a vehicular reaction type brake tester, comprise computing machine and marking apparatus, be connected by communication interface between described computing machine and marking apparatus, it is characterized in that: described marking apparatus is made of microprocessor, the communication interface circuit that is connected with the input/output port of microprocessor, 2 road curve fitting circuit, and described each curve fitting circuit comprises D/A switch circuit, amplitude regulating circuit and the impedance matching circuit that is connected with the output port of microprocessor.
4. the proving installation of vehicular reaction type brake tester according to claim 3 is characterized in that: described communication interface employing USB port.
5. the proving installation of vehicular reaction type brake tester according to claim 3 is characterized in that: described communication interface employing parallel interface.
6. the proving installation of vehicular reaction type brake tester according to claim 3 is characterized in that: described communication interface employing RS232 interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100880435A CN100395529C (en) | 2006-06-15 | 2006-06-15 | Measurement method and device for vehicular reaction type brake tester |
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| CNB2006100880435A CN100395529C (en) | 2006-06-15 | 2006-06-15 | Measurement method and device for vehicular reaction type brake tester |
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| CN1865880A true CN1865880A (en) | 2006-11-22 |
| CN100395529C CN100395529C (en) | 2008-06-18 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943626A (en) * | 2010-08-19 | 2011-01-12 | 吉林大学 | Dynamic calibration device of counter-force roller braking bench based on hydraulic servo |
| CN102221468A (en) * | 2010-04-16 | 2011-10-19 | 哈尔滨工业大学 | Automobile body LIN sub-node detection platform and detection method |
| CN102768117A (en) * | 2012-07-03 | 2012-11-07 | 浙江江兴汽车检测设备有限公司 | Portable dynamic wheel type calibrator for roller opposite force type automobile brake inspection bench |
| CN106603073A (en) * | 2016-11-24 | 2017-04-26 | 中国电子科技集团公司第四十研究所 | Integrated single-loop system for achieving low-phase-noise microwave broadband frequency synthesis |
| CN111198001A (en) * | 2018-11-16 | 2020-05-26 | 中国北方车辆研究所 | Method and system for testing stress strain of hydraulic retarder |
| CN111735616A (en) * | 2019-12-24 | 2020-10-02 | 吉林大学 | Mechanical automatic dynamic balance brake performance tester inspection bench |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101832836B (en) * | 2010-04-28 | 2012-02-01 | 吉林大学 | Dynamic calibration device of drum reaction braking checkout stand |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10053513A1 (en) * | 2000-10-27 | 2002-05-02 | Tuev Kraftfahrt Gmbh Unternehm | Mobile device for calibrating a test stand for vehicle brakes |
| JP3788278B2 (en) * | 2001-07-04 | 2006-06-21 | 株式会社明電舎 | Brake tester control system |
| CN2493470Y (en) * | 2001-08-03 | 2002-05-29 | 关春善 | Rollr counter force type brake test platform tester |
-
2006
- 2006-06-15 CN CNB2006100880435A patent/CN100395529C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221468A (en) * | 2010-04-16 | 2011-10-19 | 哈尔滨工业大学 | Automobile body LIN sub-node detection platform and detection method |
| CN101943626A (en) * | 2010-08-19 | 2011-01-12 | 吉林大学 | Dynamic calibration device of counter-force roller braking bench based on hydraulic servo |
| CN101943626B (en) * | 2010-08-19 | 2012-08-08 | 吉林大学 | Dynamic calibration device of counter-force roller braking bench based on hydraulic servo |
| CN102768117A (en) * | 2012-07-03 | 2012-11-07 | 浙江江兴汽车检测设备有限公司 | Portable dynamic wheel type calibrator for roller opposite force type automobile brake inspection bench |
| CN102768117B (en) * | 2012-07-03 | 2015-04-15 | 浙江江兴汽车检测设备有限公司 | Portable dynamic wheel type calibrator for roller opposite force type automobile brake inspection bench |
| CN106603073A (en) * | 2016-11-24 | 2017-04-26 | 中国电子科技集团公司第四十研究所 | Integrated single-loop system for achieving low-phase-noise microwave broadband frequency synthesis |
| CN106603073B (en) * | 2016-11-24 | 2021-04-27 | 中国电子科技集团公司第四十一研究所 | Integrated single-ring system for realizing low-phase-noise microwave wide-band frequency synthesis |
| CN111198001A (en) * | 2018-11-16 | 2020-05-26 | 中国北方车辆研究所 | Method and system for testing stress strain of hydraulic retarder |
| CN111198001B (en) * | 2018-11-16 | 2022-09-30 | 中国北方车辆研究所 | Method and system for testing stress strain of hydraulic retarder |
| CN111735616A (en) * | 2019-12-24 | 2020-10-02 | 吉林大学 | Mechanical automatic dynamic balance brake performance tester inspection bench |
| CN111735616B (en) * | 2019-12-24 | 2021-09-21 | 吉林大学 | Mechanical automatic dynamic balance brake performance tester inspection bench |
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| CN100395529C (en) | 2008-06-18 |
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