Dab tsi yog Txoj Cai Ua Haujlwm Ntawm Ib Lub Speedometer Sensor?

Speedometer sensors hloov cov khoom nrawm mus rau qhov ntsuas hluav taws xob teeb liab (xws li qhov hluav taws xob, zaus lossis mem tes suav), uas yog siv hluav taws xob ua tiav los tsav lub koob lossis tso saib tus nqi nrawm ntawm lub vijtsam. Lawv cov ntsiab lus tseem ceeb yog ua raws li electromagnetic induction, Hall effect, photoelectric effect lossis Doppler effect. Nov yog saib seb ntau hom speedometer sensors ua haujlwm li cas thiab lawv siv li cas:
I. Electromagnetic Induction Speed ​​​​Sensor
Nws ua haujlwm li cas: Raws li Faraday txoj cai lij choj electromagnetic induction, thaum cov khoom siv hluav taws xob (xws li cov coils) txav mus rau hauv qhov chaw sib nqus, txiav cov kab hlau nplaum sib nqus tsim ib qho hluav taws xob hluav taws xob (EMF) (voltage). Qhov loj ntawm induction emf yog proportional rau qhov ceev ntawm tus neeg xyuas pib txiav cov kab sib nqus, raws li hauv qab no:
E.L.v.
Qhov twg,
Qib B
Nws yog magnetic teb zog,
l/
yog qhov ntev ntawm lub coil, thiab
v. Kev Taw Qhia
Nws yog qhov txiav ceev.
Qauv:
Sib nqus cores thiab coils: tsau nyob rau hauv lub sensor vaj tse los tsim ib tug ruaj khov magnetic teb.
Sib nqus core axis txuas nrog cov khoom raug ntsuas: Thaum cov khoom txav mus, nws tsav cov tub ntxhais ncej tig, ua rau coil txiav cov kab sib nqus.
Cov teeb liab tso zis: Lub zog hluav taws xob induced (voltage) yog proportional rau ceev thiab tsis tas yuav tsum tau siv hluav taws xob sab nraud (passive tsim).
Daim ntawv thov:
Lub cev muaj zog ceev sensor: mounted rau ntawm ib tug tsav qag tsev nyob los yog kis tau tus mob vaj tse, alternating tam sim no signals yog generated los ntawm kev sib hloov ntawm ib tug sib nqus log (rotor nrog lub zog). Lub teeb liab amplitude yog proportional rau qhov ceev, thiab qhov zaus qhia qhov ceev.
Kev soj ntsuam kev vibration: Piv txwv li, SZ-6K ceev sensor saib xyuas qhov ceev, amplitude thiab zaus ntawm kev vibrations txhawm rau muab kev ceeb toom ntxov ntawm kev ua haujlwm tsis zoo hauv cov tshuab teb xws li twj thiab kiv cua.
Lub zog thiab qhov tsis muaj zog:
Lub zog: Cov qauv yooj yim, txhim khu kev qha, tsis tshua muaj lus teb, tsis muaj hluav taws xob sab nraud xav tau.
Tsis muaj zog: me me, tsis haum rau kev ntsuas ceev; rhiab rau qhov kub thiab txias, yuav tsum tau them nyiaj circuitry.
ii. Hall Effect Speed ​​​​Sensor
Nws ua haujlwm li cas: Thaum cov hluav taws xob tam sim no dhau los ntawm semiconductor (Hall element) muab tso rau hauv qhov chaw sib nqus, nws tsim qhov sib txawv voltage (Hall voltage) perpendicular mus rau cov kev taw qhia ntawm tam sim no thiab cov magnetic teb. Raws li qhov sib nqus lub zog hloov pauv, Hall voltage, ua square-wave pulses proportional to speed.
Qauv:
Hall element: Muab kev ua haujlwm tsis tu ncua.
Trigger Iav / Sib Nqus Ncej Log: Hloov cov hlau nplaum lub zog raws li ntsuas axis tig.
Cov teeb liab tso zis: zaus yog proportional rau ceev, amplitude yog tom ntej Circuit Court shaping yog yuav tsum tau.
Lub hom phiaj: Automotive crankshaft / camshaft txoj hauj lwm sensor: Tig ignition thiab roj txhaj tshuaj circuits.
Wheel Speed ​​​​Sensor (ABS): Tshawb xyuas lub log nrawm kom tiv thaiv kev xauv thaum nres.
Lub zog thiab qhov tsis muaj zog:
Qhov zoo: Kev ntsuas tsis sib cuag, lub neej ntev, kev teb ceev ceev, yooj yim cov teeb liab tso zis ua haujlwm.
Tsis muaj zog: Cov khoom siv hluav taws xob sab nraud xav tau, lub hom phiaj yuav tsum tau ua kom tshwm sim (iav / ncej).
III. Photoelectric Effect Ceev Sensor
Nws ua haujlwm li cas: Kev nrawm yog ntsuas los ntawm emission, thaiv lossis kev cuam tshuam ntawm lub teeb. Lub teeb los ntawm lub teeb pom kev zoo (xws li LED) illuminates saum npoo ntawm cov khoom rotating (los yog perforated / toothed disk), thaum lub receiver photosensitive (xws li aa photodiode) pom cov kev hloov hauv lub teeb thiab ua rau cov teeb liab mem tes.
Structure: Lub teeb qhov chaw thiab receiver: muab tso rau opposite ib leeg (kev sib kis) los yog nyob rau tib sab (reflection).
Code Disc / Reflective Marker: Hloov txoj hauv kev ntawm lub teeb thaum sib hloov, ua cov pulses.
Cov teeb liab tso zis: Ntau zaus yog proportional rau ceev thiab yuav tsum tau ua tom ntej Circuit Court.
Lub hom phiaj: servo motors, CNC tshuab cuab yeej, tshuab luam ntawv thiab lwm yam siab - ntsuas qhov tseeb.
Optical nas nrawm ntsuas: Qhov ceev ntawm kev txav yog xam los ntawm kev kuaj pom cov kev hloov pauv hauv lub teeb pom kev ntawm lub desktop.
Lub zog thiab qhov tsis muaj zog:
Lub zog: Touchless, siab precision, ceev cov tshuaj tiv thaiv lub sij hawm.
Tsis muaj zog: rhiab heev rau kev ua qias tuaj, tuaj yeem cuam tshuam los ntawm lub teeb pom kev zoo, cov qauv nyuaj.
IV. INTRODUCTION INTRODUCTION Doppler Effect Velocity Sensor
Nws ua haujlwm li cas: Thaum lub qhov nthwv dej txav mus rau tus neeg soj ntsuam, qhov zaus ntawm cov nthwv dej tau txais los ntawm cov neeg soj ntsuam hloov (Doppler hloov). Sensors emit electromagnetic nthwv dej (radar nthwv dej los yog lasers), qhov zaus ntawm uas yog proportional rau qhov tshaj tawm ntawm cov khoom (v) thiab qhov zaus yog nyob nruab nrab ntawm lub reflected thiab emitting tsis (Δf):
Vf
Siv: Siv rau kev ntsuas ceev: Radar speedometers, laser velocimeters.
Kev Saib Xyuas Kev Lag Luam: Kev ntsuas cov hlau ceev ntawm cov ntawv hlau thiab ntawv.
Kev ntsuas dej nrawm: Laser Doppler velocimeters (LDVs) ntsuas qhov ntws nrawm ntawm cov kua lossis roj.
Pros thiab cons
Lub zog: Touchless, ntev - ntsuas qhov ntsuas, qhov tseeb siab.
Tsis muaj zog: Tus nqi siab, yuav tsum tau ua kom pom tseeb ntawm lub hom phiaj, lub kaum sab xis cuam tshuam rau kev ntsuas cov txiaj ntsig (xav tau kev them nyiaj cosine).
V. Daim ntawv thov tshwj xeeb ntawm Speedometer Sensors hauv tsheb
Tsheb Ceev Qhia: sensor tso zis teeb liab yog ua tiav hauv tshuab hluav taws xob, thiab qhov taw qhia tsav lossis cov ntxaij vab tshaus qhia ceev.
Electromagnetic speedometer: Tsav lub pointer deflection los ntawm cov teeb liab tam sim no, siab precision.
Digital speedometer: Qhia cov lej ncaj qha, tejzaum nws muab tso rau hauv lub ntsuas vaj huam sib luag lossis lub vijtsam hauv nruab nrab.
Tswj Kev Ua Haujlwm
Cav Idle Ceev servo tswj: kho idling ceev, txo roj noj.
Tsis siv neeg kis tau tus mob: txiav txim siab hloov lub sij hawm raws li ceev thiab cav ceev.
Cruise control: Tswj ceev ceev kom txo tau tus neeg tsav tsheb qaug zog.
Cooling Fan Control: kho kiv cua ceev raws li kev ceev thiab lub cav kub.