CN102818705B - Air valve rebounding test method - Google Patents
Air valve rebounding test method Download PDFInfo
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- CN102818705B CN102818705B CN 201210282129 CN201210282129A CN102818705B CN 102818705 B CN102818705 B CN 102818705B CN 201210282129 CN201210282129 CN 201210282129 CN 201210282129 A CN201210282129 A CN 201210282129A CN 102818705 B CN102818705 B CN 102818705B
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Abstract
The invention relates to an air valve rebounding test method. A test device consisting of a gap sensor, a charge amplifier, a data recording instrument, a voltage stabilizing power supply and a dial indicator is adopted, the distance between the measurement surface of the gap sensor and the surface of a tested object meets the requirement that a certain voltage value is generated by the sensor, the voltage value is amplified by the charge amplifier and is processed and analyzed by a data analysis instrument to obtain a voltage-time curve, and the curve can reflect the air valve moving rule. The test method provided by the invention has the advantages that when conditions including rocker arm falling, air valve abnormal sound and the like occur on an engine, whether the phenomenon is associated with the air valve rebounding or not is judged, so the test method capable of fast obtaining the air valve mechanism moving features and judging whether the air valve rebounding occurs or not inthe test or the maintenance is provided.
Description
Technical field
The present invention relates to a kind of valve reocil test method, particularly relate to a kind of for the valve reocil test method of judging the internal combustion valve mechanism kinetic characteristic fast.
Background technology
The valve opening of engine and closing organ are made up of valve, cam, valve spring and corresponding assembly etc.In the high engine speeds operation process, because rigidity, valve and spring base quality, the isoparametric influence of cam profile of spring make this system show different characteristics.If spring rate deficiency, valve and spring base quality are excessive etc., all can make valve knock-on at a high speed occur.The kinetic characteristic that knock-on will destroy valve takes place in inlet valve, and engine performance is produced certain influence, if hydraulic tappet is installed, tends to cause rocking arm to come off; And exhaust valve knock-on make valve disc and valve stem junction exposure duration in high-temperature fuel gas elongated, thermal load increases to some extent, and reliability is had a negative impact.Be badly in need of to judge fast the kinetic characteristic of valve mechanism in pilot production or the maintenance and judge the test method whether valve bounces.
Summary of the invention
The objective of the invention is to overcome the weak point that exists in the above-mentioned technology, provide a kind of simple in structure, reasonable in design, the precision height can be judged the kinetic characteristic of valve mechanism fast, and the valve reocil test method of strong test figure is provided for research and development.
In order to achieve the above object, the technical solution used in the present invention is: adopt the test unit of being made up of gap sensor, charge amplifier, datalogger, stabilized voltage supply and dial gauge, described valve reocil test method comprises following steps: A, gap sensor is installed in engine cylinder covers, gap sensor when mounted, requiring the distance with measured surface is 0.1mm～0.5mm; B, engine is installed on the test-bed, charge amplifier, datalogger and stabilized voltage supply are installed, connect signal wire, check whether gap sensor has output signal; C, with dial gauge sensor is calibrated, at first made valve be in closed condition, the dial gauge stylus printer is kept on the seat at valve, record zero-point voltage value; Rotating cam axle then, the dial gauge pointer changes, and the voltage that sensor records also changes, when the percentage tabular value is constant, record corresponding magnitude of voltage, be the maximum lift of corresponding valve, this two point voltages value is input in the testing software, finish pick up calibration; D, inspection engine installment state and testing apparatus connect situation, pilot engine, and check again whether the gap sensor output signal is normal; E, test, record gap sensor output voltage and time relation, and test figure put in order, analyzes, the establishment test report also provides conclusion (of pressure testing).Advantage of the present invention is: the invention provides a kind of novel test method, can judge the kinetic characteristic of valve mechanism fast, for research and development provide strong test figure, for the exploitation service, accelerate the research and development process better.
Description of drawings [0004]Fig. 1 is the test unit annexation block diagram of test method of the present invention;
Valve lift curve when Fig. 2 is 6000rpm of the present invention;
Fig. 3 is a kind of theoretical curve of the present invention when measuring valve motion;
Fig. 4 is the another kind of theoretical curve of the present invention when measuring valve motion.
Embodiment [0005]Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.By Fig. 1-Fig. 4 as can be known, the present invention adopts the test unit of being made up of gap sensor, charge amplifier, datalogger, stabilized voltage supply and dial gauge, described valve reocil test method comprises following steps: A, gap sensor is installed in engine cylinder covers, gap sensor when mounted, requiring the distance with measured surface is 0.1mm～0.5mm; B, engine is installed on the test-bed, charge amplifier, datalogger and stabilized voltage supply are installed, connect signal wire, check whether gap sensor has output signal; C, with dial gauge sensor is calibrated, at first made valve be in closed condition, the dial gauge stylus printer is kept on the seat at valve, record zero-point voltage value; Rotating cam axle then, the dial gauge pointer changes, and the voltage that sensor records also changes, when the percentage tabular value is constant, record corresponding magnitude of voltage, be the maximum lift of corresponding valve, this two point voltages value is input in the testing software, finish pick up calibration; D, inspection engine installment state and testing apparatus connect situation, pilot engine, and check again whether the gap sensor output signal is normal; E, test, record gap sensor output voltage and time relation, and test figure put in order, analyzes, the establishment test report also provides conclusion (of pressure testing).The mounting means that described gap sensor covers at engine cylinder is the anchor clamps fixed installations.The mounting means that described gap sensor covers at engine cylinder is for to fix gap sensor with glue.Valve reocil test method of the present invention adopts the test unit of being made up of gap sensor, charge amplifier, datalogger, stabilized voltage supply and dial gauge.The measurement surface of gap sensor and the distance between the testee surface make sensor produce certain magnitude of voltage, and along with the change of distance is big, magnitude of voltage is linear to become big, thereby can be by the variation of magnitude of voltage, the characteristics of motion of reflection valve.By the annexation block diagram of Fig. 1 as can be known, above-mentioned voltage signal amplifies through charge amplifier, through the data analyzer Treatment Analysis, draws data and curve that we want.Wherein stabilized voltage supply is to charge amplifier power supply usefulness.As embodiment, test unit can adopt surveying instrument as shown in table 1, also can adopt function class like the surveying instrument shown in the table 1.Table 1
| Sequence number | Title | Specification or model | The place of | Remarks | |
| 1 | Gap sensor | PU-05 | Japan | Measuring distance 0～2mm | |
| 2 | Charge amplifier | AEC-5505 | Japan | Do not have | |
| 3 | Data analyzer | SCM05 | Belgium | Sampling rate can reach 102400Hz | |
| 4 | Stabilized voltage supply | ±12V DC | China | Be the charge amplifier power supply | |
| 5 | Dial gauge | The dials formula | China | Be used for proofreading and correct |
The first step of process of the test is gap sensor to be installed in engine cylinder cover, gap sensor when mounted, requiring the distance with measured surface is 0.1mm～0.5mm; The one, come in contact to prevent gap sensor and measured surface, cause the damage of sensor; The 2nd, the measurement range of gap sensor own is smaller, installs as far as possible nearby.The mounting means that gap sensor covers at engine cylinder determines according to the engine valve interior space, generally adopts anchor clamps fixed installation mode or with glue gap sensor fixed.Second step was installed to engine on the test-bed, and charge amplifier, datalogger and stabilized voltage supply are installed, and connected signal wire, checked whether gap sensor has output signal; The 3rd step calibrated sensor with dial gauge, at first made valve be in closed condition (rocking arm is on basic circle), the dial gauge stylus printer was kept on the seat record zero-point voltage value at valve; Rotating cam axle then, the dial gauge pointer changes, and the voltage that sensor records also changes, when the percentage tabular value is constant, record corresponding magnitude of voltage, be the maximum lift of corresponding valve, this two point voltages value is input in the testing software, finish pick up calibration.The 4th step was to check that engine installment state and testing apparatus connect situation, piloted engine, and checked again whether the gap sensor output signal is normal.The 5th step tested, record gap sensor output voltage and time relation, and test figure put in order, analyzes, the establishment test report also provides conclusion (of pressure testing).Fig. 2 is the valve stroke test curve of certain h type engine h when throttle wide, rotating speed 6000rpm.Find out that from figure engine intake valve 1 and inlet valve 4 all do not have tangible valve rebound phenomenon, just some slight fluctuation tends towards stability then, becomes straight line.Below in conjunction with Fig. 3, Fig. 4 principle of work of the present invention is described: the measurement surface of gap sensor and the distance between the testee surface make sensor produce certain magnitude of voltage, and along with the change of distance is big, magnitude of voltage is linear to become big.Above-mentioned magnitude of voltage amplifies through charge amplifier, through the data analyzer Treatment Analysis, draws voltage-time curve, the characteristics of motion of this curve reflection valve.As shown in Figure 3, when valve was in closed condition, the output voltage of gap sensor was minimum, shown in curve such as the label 1.When valve stroke during greater than the range of the gap sensor that adopts, it is maximum constant that the voltage that sensor records will keep, shown in curve such as the label 2.When knock-on appearred in valve, several sinusoidal waveforms appearred in label 3 places; When valve did not occur bouncing, label 3 places should be straight lines.If the range of the gap sensor that uses is greater than the valve maximum lift, then the curve at label 2 places as shown in Figure 4.The present invention mainly utilizes the curve at label 3 places, is that sinusoidal waveform or straight line judge whether valve knock-on occurs by label 3 places, if knock-on can be judged frequency and the intensity of bouncing by sinusoidal wave frequency and amplitude.Test method of the present invention is when situations such as rocking arm comes off, valve abnormal sound occurring at engine, judge whether this phenomenon is related with valve knock-on existence, can in pilot production or maintenance, draw the kinetic characteristic of valve mechanism fast and judge the test method whether valve bounces thereby provide a kind of.
Claims (3)
1. valve reocil test method, it is characterized in that: adopt the test unit of being formed by gap sensor, charge amplifier, datalogger, stabilized voltage supply and dial gauge, described valve reocil test method comprises following steps: A, gap sensor is installed in engine cylinder covers, gap sensor when mounted, requiring the distance with measured surface is 0.1mm～0.5mm; B, engine is installed on the test-bed, charge amplifier, datalogger and stabilized voltage supply are installed, connect signal wire, check whether gap sensor has output signal; C, with dial gauge sensor is calibrated, at first made valve be in closed condition, the dial gauge stylus printer is kept on the seat at valve, record zero-point voltage value; Rotate the camshaft on the described engine then, the dial gauge pointer changes, and the voltage that sensor records also changes, when the percentage tabular value is constant, record corresponding magnitude of voltage, be the maximum lift of corresponding valve, this two point voltages value is input in the testing software, finish pick up calibration; D, inspection engine installment state and testing apparatus connect situation, pilot engine, and check again whether the gap sensor output signal is normal; E, test, record gap sensor output voltage and time relation, and test figure put in order, analyzes, the establishment test report also provides conclusion (of pressure testing); Described test figure is put in order, analyze and specifically refer to: the measurement surface of gap sensor and the distance between the testee surface, make sensor produce certain magnitude of voltage, and along with the change of distance is big, magnitude of voltage is linear to become big, magnitude of voltage amplifies through charge amplifier, through the data analyzer Treatment Analysis, draw voltage-time curve, the characteristics of motion of this curve reflection valve, when valve was in closed condition, the output voltage of gap sensor was minimum, when valve stroke during greater than the range of the gap sensor that adopts, it is maximum constant that the voltage that sensor records will keep, and when knock-on appearred in valve, several sinusoidal waveforms appearred in curve, when valve does not occur bouncing, be straight line, if knock-on can be judged frequency and the intensity of bouncing by sinusoidal wave frequency and amplitude.
2. valve reocil test method according to claim 1 is characterized in that: the mounting means that described gap sensor covers at engine cylinder is the anchor clamps fixed installations.
3. valve reocil test method according to claim 1 is characterized in that: the mounting means that described gap sensor covers at engine cylinder is for to fix gap sensor with glue.
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| CN 201210282129 CN102818705B (en) | 2012-08-09 | 2012-08-09 | Air valve rebounding test method |
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| CN106338400B (en) * | 2016-08-26 | 2018-06-08 | 哈尔滨东安汽车发动机制造有限公司 | Engine valve flies off test method |
| CN107884194A (en) * | 2017-11-07 | 2018-04-06 | 西华大学 | A kind of big valve stroke measurement and knock-on test device and method |
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| JPH03235712A (en) * | 1990-02-13 | 1991-10-21 | Nissan Motor Co Ltd | Vehicle height adjusting device in automobile |
| JP2005273650A (en) * | 2004-02-26 | 2005-10-06 | Hitachi Ltd | Variable valve control device for internal combustion engine |
| CN100580474C (en) * | 2004-05-13 | 2010-01-13 | 三菱电机株式会社 | State recognizing device and switching controller of power switching apparatus using state recognizing device |
| CN101881198A (en) * | 2010-03-09 | 2010-11-10 | 于宥源 | Engine variable power distribution control system |
| US9312086B2 (en) * | 2010-10-25 | 2016-04-12 | Dynapar Corporation | Proximity switch with snap lock |
| CN102620924B (en) * | 2012-04-12 | 2014-07-09 | 杭州电子科技大学 | Device and method for measuring dynamic rigidity of valve spring of valve mechanism |
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