Ib, technical essence ntawm lub sij hawm teb ntawm qhov tawg code screen
Lub sij hawm teb ntawm lub vijtsam tawg yog hais txog lub sijhawm luv ntawm kev hloov pauv ntawm cov teeb liab tawm tswv yim thiab ua tiav qhov hloov tshiab ntawm cov ntsiab lus screen. Nws feem ntau yog tsim los ntawm lub sijhawm nce (lub sijhawm rau lub teeb liab hloov ntawm theem qis mus rau theem siab) thiab lub caij nplooj zeeg (lub sijhawm rau lub teeb liab hloov ntawm theem siab mus rau theem qis). Nws cov kev siv txuj ci suav nrog cov ntsiab lus hauv qab no:
Tsav voltage thiab kev tsis ncaj ncees tsim
Lub code breaking screen yog tsav los ntawm AC thiab tswj los ntawm qhov sib txawv voltage ntawm COM (common davhlau ya nyob twg) thiab SEG (segment davhlau ya nyob twg) ntswj cov kua siv lead ua kua molecules. Piv txwv li, ib qho qauv ntawm qhov screen tawg tau txais 1/3 kev tsis ncaj ncees tsim, thiab qhov sib txawv ntawm qhov sib txawv ntawm COM thiab SEG tau muab faib ua peb theem: V1, V2, thiab V3, qhov twg V1 / V3=1/3. Yog tias qhov teeb tsa tsis ncaj ncees yog qhov tsis raug (xws li thaum pib debugging, yog tias qhov kev tsis ncaj ncees tau teeb tsa rau 1/3 thiab cov zaub tsis pom), nws yuav ncua lub sijhawm sib tw ntawm cov kua siv lead ua kua molecules thiab ncaj qha nce cov lus teb qeeb.
Lub luag hauj lwm voj voog thiab ncej zaus optimization
Lub luag haujlwm lub voj voog yog txhais raws li qhov piv ntawm lub sijhawm ua haujlwm ntu rau tag nrho lub sijhawm voj voog, feem ntau cuam tshuam nrog tus lej ntawm COM. Piv txwv li, lub voj voog ua haujlwm ntawm 4COM code cuam tshuam qhov screen yog 1/4, uas txhais tau hais tias txhua ntu code tsuas yog ua rau 25% ntawm lub sijhawm thaum lub voj voog. Lub thav duab zaus (hloov tus nqi ib ob) yuav tsum sib npaug ntawm lub zog noj thiab flicker hnov, feem ntau yog li ntawm 30Hz txog 100Hz. Yog hais tias tus ncej zaus tsawg dhau (xws li hauv qab 30Hz), lub vijtsam yuav flicker noticeably; Yog tias nws siab dhau lawm (xws li ntau tshaj 100Hz), nws yuav ua rau kom muaj zog tsav tsheb thiab yuav ua rau muaj teeb meem cuam tshuam.
Contrast thiab teeb liab kev ncaj ncees
The contrast is determined by the ratio of the effective voltage value (Von) of the illuminated segment to the effective voltage value (Voff) of the extinguished segment. High contrast (such as Von/Voff>5: 1) tuaj yeem txhim kho qhov pom tseeb, tab sis nws yog qhov tsim nyog los xyuas kom meej tias qhov kev hloov pauv ntawm qhov hluav taws xob tsis pub dhau qhov kev ua siab ntev ntawm cov khoom siv lead ua kua, txwv tsis pub nws yuav ua rau lub sij hawm teb.
2, Kev cuam tshuam ntau yam ntawm lub sijhawm teb ntawm cov txiaj ntsig kev xeem
1. Cov ntaub ntawv distortion hauv dynamic ntsuas scenarios
Nyob rau hauv cov xwm txheej zoo xws li kev kuaj pom cov pa tawm thiab kev saib xyuas cov dej ntws, cov lus teb qeeb ntawm qhov kev tshuaj ntsuam kev ua txhaum cai tuaj yeem ua rau cov txiaj ntsig tau tshwm sim los tom qab qhov ntsuas qhov tseeb. Piv txwv li, ib qho khoom siv hluav taws xob hluav taws xob siv lub sijhawm 10 thib ob teb lub sijhawm txiav tawm. Thaum cov methane concentration nyob rau hauv ib puag ncig dhia los ntawm 0% mus rau 5%, lub vijtsam zaub tsuas yog hloov mus rau 3%, uas ploj lawm lub sijhawm ceeb toom zoo tshaj plaws. Ib yam li ntawd, hauv kev tshuaj xyuas ammonia nitrogen ntawm cov dej phwj tuaj kho, yog tias lub sijhawm teb ntawm kev txiav - tawm ntawm lub vijtsam dhau lub sijhawm teb cov lus teb ntawm cov tshuaj ammonia nitrogen tshuaj xyuas cov cuab yeej (1-30 feeb), nws yuav tsis tuaj yeem cuam tshuam qhov kev hloov pauv ntawm cov pa phem ntawm qhov nkag hauv lub sijhawm, uas yuav cuam tshuam rau kev txiav txim siab hloov txheej txheem.
2. Kev ua yuam kev nyob ruaj khov - lub xeev ntsuas
Txawm hais tias cov khoom ntsuas tau nyob rau hauv lub xeev ruaj khov, qhov kev ncua sij hawm rau cov lus teb rau qhov kev tshuaj ntsuam tawg lawm tseem yuav qhia txog qhov yuam kev. Siv qhov ntsuas kub ntawm qhov ntsuas kub tsis tu ncua ua piv txwv, yog tias qhov ntsuas kub ntsuas qhov tseeb nce mus txog ± 0.1 degree, tab sis lub sijhawm teb ntawm tus lej rhuav lub vijtsam yog 5 vib nas this, thaum qhov kub nce ntawm 25℃mus rau 25.1 degree, lub vijtsam tuaj yeem ncua kev nthuav tawm tus nqi tshiab, ua rau lub zog tswj kom tsis txhob muaj qhov kub thiab txias tsis ua haujlwm.
3. Instability txaus ntshai ntawm kaw - voj tswj system
Hauv kev lag luam automation cov kab ntau lawm, lub vijtsam tawg yog feem ntau siv los ua tib neeg -tshuab interface (HMI) los tso saib qhov tseem ceeb tsis xws li siab thiab ceev. Yog hais tias nws lub sij hawm teb tsis phim lub voj voog ntawm kev tswj (xws li PLC scanning voj voog ntawm 100ms thiab code cuam tshuam lub sij hawm teb lub sij hawm ntawm 200ms), nws yuav ua rau lub tswv yim teeb liab ncua, ua rau lub system overshoot los yog oscillation. Piv txwv li, kev tswj qhov kub thiab txias ntawm qee lub tshuab txhaj tshuaj molding tau ntsib qhov kev ncua sij hawm rau cov lus teb rau qhov kev tshuaj ntsuam tawg, ua rau cov pwm kub hloov pauv mus rau ± 5 degree, ua rau 12% nce hauv cov khoom tsis zoo.
4. Synchronization imbalance nyob rau hauv ntau -sensor kev koom tes
Nyob rau hauv lub automotive electronic control unit (ECU), engine kub sensors, siab sensors, thiab lwm yam tso saib cov ntaub ntawv los ntawm ib tug disconnect screen. Yog tias lub sij hawm teb ntawm qhov kev tshuaj ntsuam txhaum cai sib haum rau txhua lub sensor tsis sib haum (xws li qhov ntsuas kub ntawm 200ms, siab cov lus teb ntawm 500ms), yuav muaj lub sijhawm sib txawv ntawm cov ntaub ntawv tau txais los ntawm ECU, uas yuav cuam tshuam rau qhov tseeb ntawm cov tswv yim tswj xws li roj txhaj tshuaj kom muaj nuj nqis thiab ignition ua ntej lub kaum sab xis, qhov kawg yuav ua rau lub zog qis dua.
3, Cov tswv yim tswv yim rau optimizing lub sij hawm teb ntawm tawg code screens
1. Hardware theem: xaiv thiab tsav optimization
Xaiv cov ntaub ntawv tsis tshua muaj latency kua siv lead ua: Siv TN (twisted nematic) lossis STN (super twisted nematic) cov ntaub ntawv siv lead ua kua tuaj yeem txo lub sijhawm teb rau 5-15ms, uas yog ntau dua 50% siab dua li cov khoom siv VA ( ntsug dluab).
Optimize tus tsav tsheb Circuit Court tsim: Tsim siab - zaus PWM teeb liab los ntawm MCU ua -nyob rau hauv LCD maub los lossis lwm tus tsav tsheb nti (xws li HT1621) kom txo tau lub sijhawm voltage stabilization. Piv txwv li, ib qho qauv ntawm qhov screen tawg tuaj yeem txo lub sijhawm teb rau 8ms los ntawm kev ua kom lub zog tsav ntawm 32Hz mus rau 64Hz.
Dynamic hloov ntawm kev tsis ncaj ncees thiab lub luag haujlwm lub voj voog: Tsis siv neeg ntsuas qhov kev tsis sib haum xeeb raws li qhov ntsuas kub ib puag ncig (xws li hloov kho los ntawm 1/3 txog 1/2), thiab siv lub voj voog hloov pauv kom ua kom lub sijhawm ua piv txwv hauv qis- qhov kub thiab txias, them rau qhov txo qis hauv qhov sib tw ntawm cov kua siv lead ua kua.
2. Software qib: Algorithm them nyiaj thiab kev lim dej
Daim ntawv thov ntawm kev twv ua ntej algorithm: Qhia Kalman lim lossis txav nruab nrab algorithm nyob rau hauv cov ntaub ntawv tau txais cov theem kom kho cov nqi tso tawm ntawm lub vijtsam tawg. Piv txwv li, ib qho flowmeter them nyiaj rau kev ncua sij hawm ntawm 200ms mus rau 50ms los ntawm kev kwv yees algorithms, txo qhov ntsuas qhov yuam kev mus rau ± 0.5%.
Synchronous refresh mechanism: Hauv ntau -sensor systems, hardware synchronization signals lossis software timestamp technology yog siv los xyuas kom meej tias tag nrho cov ntaub ntawv screen disconnected tau hloov kho tib lub sijhawm siv, zam kev sib koom ua haujlwm tsis zoo.
3. System theem: Environmental adaptation thiab tu calibration
Temperature them nyiaj tsim: Kev sib koom ua ke ntawm qhov ntsuas kub hauv qhov hluav taws xob ntawm qhov tawg code screen tsav tsheb, thiab hloov kho lub zog tsav tsheb raws li qhov ntsuas kub. Piv txwv li, ib qho cuab yeej saib xyuas sab nraum zoov tswj cov lus teb lub sij hawm hloov pauv hauv ± 10% los ntawm kev them nyiaj kub nyob rau hauv thaj tsam ntawm -20℃txog 50 degree.
Tsis tu ncua calibration thiab txij nkawm: Tsim ib tug txheej txheem rau kev soj ntsuam lub sij hawm teb ntawm lub tawg code screen, simulate cov tswv yim kev hloov pauv siv tus qauv teeb liab generator, ntsuas lub sij hawm teb tiag tiag los ntawm ib tug oscilloscope, thiab muab piv nrog nominal tus nqi nyob rau hauv cov khoom siv phau ntawv. Yog hais tias qhov sib txawv ntau tshaj 20%, lub LCD vaj huam sib luag los yog tsav nti yuav tsum tau hloov.
4, Kev lag luam daim ntawv thov rooj plaub thiab cov ntaub ntawv txhawb nqa
Petrochemical kev lag luam
Lub catalytic cracking unit ntawm ib qho chaw refinery siv lub code breaking screen nrog lub sij hawm teb ntawm 5ms los tso saib reactor siab, uas kuaj pom txawv txav txawv txav 10 vib nas this ua ntej cov khoom qub (lub sij hawm teb ntawm 50ms), zam lub unplanned kaw thiab txuag ntau tshaj 2 lab yuan nyob rau hauv ib xyoos twg.
Cov khoom siv kho mob teb
Ib qho oximeter tau ua kom luv luv lub sijhawm pulse yoj cov lus teb lub sijhawm los ntawm 150ms mus rau 30ms los ntawm kev ua kom zoo dua cov cai rhuav tshem lub vijtsam tsav tsheb algorithm, tso cai rau cov neeg ua haujlwm kho mob soj ntsuam cov kev hloov pauv hauv cov neeg mob ntshav oxygen saturation raws sijhawm thiab txo qhov kev kuaj mob tsis zoo los ntawm 18%.
Environmental monitoring teb
Ib lub chaw saib xyuas huab cua siv qhov ntsuas qis qis qis kom pom PM2.5 concentration. Thaum muaj cua daj cua dub tawm tsam, nws tshaj tawm cov ntaub ntawv ceeb toom 8 feeb ua ntej tshaj li cov khoom siv ib txwm muaj, suav nrog 30000 tus neeg ntxiv.
