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App109 -eddymotor
App109 -eddymotor
App109 -eddymotor
App109 -eddymotor
App109 -eddymotor
App109 -eddymotor
App109 -eddymotor
App109 -eddymotor
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App109 -eddymotor

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  • 1. multiNCDT MICRO-EPSILONEddy Current Displacement Sensors are Making a Major Contribution tothe Development of Internal Combustion Engines APPLIC A T IONIn order to improve the design of internal combustion Non-contact displacementengines and to analyse failure, it is necessary to sensors using the eddy currentmeasure the thermal and mechanical stress inside principle have proven theirthe engine. These measurements need to be made value for measuringunder real operating conditions in order to provide displacement, position andsignificant results. In both normal (running) and gap. Measurements which, amotored engines, the measuring system is exposed few years ago, wereto the most several environmental conditions: considered impossible, can now be performed successfully. The key to this is the robust High temperature and accurate multiNCDT displacement measuring Environment with oil, fuel-air mixture, system with miniaturized combustion gas or cooling water sensors. We have customized the sensors in many way and Vibrations even designed the world High pressure smallest sensor especially for this measuring task. The eddy current measuring technique, as it is used in the multiNCDT system, measures against all electrically conductive materials (metals) with high linearity and temperature stability The target can be non- . ferromagnetic or ferromagnetic. Piston installed with displacement sensors with con-rod and "crank-arm” for guiding the cable. A109e
  • 2. Sensors based on eddy current principle for multiNCDT 300/500The excellent immunity to severe environmental con-ditions of the eddy current measuring technique makesit possible to use this type of displacement sensors inrunning combustion engines. Lubricating oil, fuel orcombustion gas in the measuring gap or next to thesensor have a negligible effect on the measuringresults even under the most difficult con-ditions. A non-contact sensor system allows to measure very fastchanges in displacement (100,000 Hz) withoutaffecting the target and no wear.Eddy current displacement sensors are installed atvarious positions in the internal combustion engine. Sensors in stationary engine parts can be installed very easy. Routing of the sensor cable poses no great problems here. Examples of such applications are: Miniaturized version of the eddy current sensor 1 - Distance cylinder block-cylinder head 2 - Distance of the piston or the rings from the cylinder wall or sleeve 3 - Valve travel/valve seating 4 - Top dead centre of the piston 5 - Injector needle movement in the injection pump 6. Run out in the main crankshaft bearingThe installation of miniaturized eddy current displace-ment sensors in internal combustion engines takesknow-how skill and time. But its worth the effort ,because these sensors provide reliable data on themechanical conditions of the engine. Many applicationsat satisfied customers:- Detroit Diesel- FEV- GM- John Deere- Victor Reinz Sensors in stationary engine parts 2
  • 3. MICRO-EPSILON Examples of application for moving sensors: 7 - Orbit tracing of the gudgeon pin in the upper con- rod bearing 8 - Axial and radial movement of the piston rings in the piston groove 9 - Position of the piston relative to the cylinder wall during the whole stroke of the piston (piston secondary movement) 10 - Orbit tracing and vibrations in the bottom con-rod bearing Installation of displacement sensors in moving engine parts (pistons, con-rod, crankshaft) is a little bit more difficult. The problem is the transmission of signal from the moving part to the stationary engine block. Transmission by slip rings or RC can not be used Sensors in moving engine parts because of dimensional problems. Such a device requires modifications of the sensor cable. This will affect the measurement results as the sensor cable is a part of of the sensor circuit. One end of the crank arm is attached to the piston rod or at the upper con- rod eye and moves up and down. The other end is fixed to the engine block. From there it is easy to continue routing the cable to the amplifiers. The critical point for cable routing and for the cable stressing is in the central joint of the crank. At the joints the cable are led through the centre axle eye and therefore only exposed to torsional movement. Special Teflon-insulated coax cables with an extreme small outer diameter are used for routing along the crank arm. A crank arm designed in this way and carefully installed increases the life cycle of the cable and is therefore suitable for extensive series of measurements. Cable routing with crank arm3
  • 4. Sensors for outstanding reliability Wear and maintenance free Areas of Use Sensors are resistant to severe industrial The multiNCDT is designed for environments industrial use in production plant, Accurate and stable operation: for machine control and for Non-Linearity £ ± 0.2 % measuring and testing during in- Reliable results even from very fast events: process quality assurance. frequency response 100 kHz (-3 dB) 1 - displacement, distance, position, elongationFeatures of the series multiNCDT. 2 - vibration, amplitude, clearance, run-outSystem Structure 3 - bearing oscillation, lubricating gap, wear, run-outThe series 500 multi-channel displacement measuringsystem is modular All plug-ins are euro-size cards. . 4 - compressor-/turbine gap,A measuring system with n channels includes: revolutions 1 Eurocard cabinet with power supply 5 - stroke, deformation, axial shaft 1 Display /Interface-plug-in (optional) oscillation 1 Oscillator plug-in n Demodulator plug-ins with matching board n Sensors with cable For more information about our product range, technical data visit our web site: www.micro-epsilon.com Certified acc. to DIN EN ISO 9001: 1994multiNCDT: Non-contact displacement measuring systemsusing the eddy current principle. 4
  • 5. MICRO-EPSILON Sensor dimensions in mm (inch) ø 8.9(0.35) ø 4.6(0.2) ø 2(0.08) Nut size 7 M4x0.35 S05 S05 ø 2.5 20(0.8) 16(0.6) 1.75 ± 0.25 m (5.7 ± 0.8 ft.) 0.25 ± 0.03 m 13(0.5) 8(0.3) ø 8.9(0.35) ø 3(0.12) Nut size 8 mm M5x0.8 thread U1 U1 ø 4(0.16) ø 4(0.16) 4(0.16) 20(0.8) 16(0.63) 3 ± 0.45 m (9.8 ± 1.5 ft) 10(0.4) 20(0.8) integral cable Nut size 36 mm M24x1.5 thread U8 U8 ø 19(0.75) Nut size 19 mm 8(0.32) 30(1.2) Technical data Sensor model S05 U1 U8 mm .5 1 8 Measuring range inch .020 .039 .315 mm .7 2 13 Extended measuring range inch .028 .079 .512 mm .025 .1 .8 Offset distance non-ferromagnetic inch .001 .004 .032 mm .05 .2 1.6 Offset distance ferromagnetic inch .002 .008 .064 Linearity ≤±0.2 %FSO ±µm 1 2 16 Static resolution ≤0.01%FSO µm .05 .1 .8 Dynamic resolution ≤0.2 %FSO µm 1 2 16 Temperature range -50 to 150 °C / -60 to 300 °F Sensors and cables Demodulator DL 500/ DL504: 0-10 V Signal output Demodulator DL 501/ DL505: 4-20 mA5
  • 6. Sub-Miniature pressure resistantdisplacement sensor U05.65The displacement sensor U05.65 offers highprecision in servere environment. Itsmeasuring coil is integrated into a sub-miniature ceramics housing. A O-ring sealingenables pressure proof operation. At staticpressure tests to the sensor front face, up to2000 bar have been applied for short term.Cable routing is very simple due to miniaturecable with just 0.5 mm outer diameter. Sub-miniature design Pressure proof housing Sensor Areas of use Operation in servere environment U05.65 The environmental stable eddy High precision measurement current principle offers a wide variety features Measuring range 0.5 mm of applications, especially in with series combustion engines Linearity ±0.2 % FSO 300 or 500 - Measurement of fuel injection Resolution 0.01 % FSO electronics needle movement Sensor housing Sensor cable material: high-tenacity ceramicSub-Miniaturedisplacement sensor U05.22 Measuring direction ø2 (0.08) 2.8 (0.11) Sensor coil o-ring Sensor cable 5.0 (0.20) ø4 (0.16) Ceramic substrate Sensor dimensions in mm(inch) Sensor dimensions in mm(inch) Sub-miniature design Sensor The displacement sensor U05.22 is used to Total height of 1.3 mm U05.22 measure the vibration of the head gasket. Its High precision measurement features measuring coil is fixed on a ceramic Measuring range 0.5 mm with series substrate. With a height of 1.3 mm the sensor Linearity ±0.2 % FSO 300 or 500 can be integrated into a cylinder head gasket. Resolution 0.01 % FSO electronics 6
  • 7. MICRO-EPSILON Shielded non-contact displacement sensor S 05/180.17 The special design of the eddy current displacement sensor is suitable for a flush installation in metal surfaces. The maximum operating temperature is increased up to +180 °C (356 °F). Because of the small size, this sensor can be used under restricted installation conditions without sacrifeing reliability and accuracy The sensor is connected via a miniature . coaxial cable to a small transition pc-board with standard coaxial cable extension. The front part of the sensor consists of ceramics which is potted in a cylindrical steel housing (M4 x 0.35) with epoxy resin. The small size doesn’t allow to build a complete cable relief at the sensor Therefore it is necessary to provide . Areas of use mechanical support for the cable immediately behind - Measurement of radial and axial motion of shafts the sensor. - Piston motion in the cylinder - Measurements of gasket gap and lubricating gap - Acquisition of valve movements Non-contact measurement under - Nozzle needle stroke in injection pumps operating conditions Flush installation in a metal surfaces Environmental stable µm-accuracy Sensor S05/180.17 not to scale, mm(inch) High measuring speed Temperature stability up to +180 °C (356 °F) Sensor SW 3.2 (0.13) 3 S 05/180.17 (0.12) ≈ 13 (0.51) features SMC- Extension cable C3/1 Transition Integral miniature Sensor connector pc board coaxial cable S 05/180.17 10x16 (.36x.62) shrinkage tube shrinkage tube »28 (1.1) 3000 ±450 (9.8 ±1.5 ft) 500 (1.6 ft)7
  • 8. MICRO-EPSILONShielded non-contact displacement sensor S 05/180.16 Application example Gap measuring in an operating combustion engine between cylinder block and cylinder head. Mounting in the cylinder head or engine block.Sensor dimensions in mm (inch) Measuring Integral cable direction ø 0.5 (0.02) Length: 250 (9.8) Non-contact measurement under operating conditions ø 4.5 (0.18) Flush installation in metal surfaces Environmental stable µm-accuracy The special features of High measuring speed Temperature stability up to +180 °C (356 °F) the sensor S 05/180.16Unshielded non-contact displacement sensor S 05.08Areas of use- Piston motion in the cylinder- Acquisition of piston ring motion- Measurement of gasket gap and lubricating gap- Acquisition of valve movement- Nozzle needle stroke in injection pumbs- Measuring radial and axial motion of shafts MICRO-EPSILON MESSTECHNIK GmbH & CO. KG Königbacher Strasse 15 Telefon: +49/85 42/1 68-0 e-mail: info@micro-epsilon.de D-94496 Ortenburg / Germany Telefax: +49/85 42/1 68 90 http://www.micro-epsilon.com

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