Programmable Diagnostic Power Supply Rau Common Rail Systems - Adaptive Voltage/Tam sim no Nrog Multi-Layer Protection

 

Niaj hnub nimno diesel cav tswj chav tsev muaj cov zaus hloov pauv cov tswj hwm uas vam khom rau DC cov tswv yim ruaj khov. Txawm li cas los xij, thaum cov txheej txheem kuaj mob, cov khoom siv hluav taws xob hauv lub rooj cob qhia feem ntau qhia txog ripple thiab ntu ntu ntu uas ua rau lub cev tsis ua haujlwm lossis ua rau ECU nkag mus rau hom limp. Qhov Kev Ntsuas Hluav Taws Xob no hais txog qhov muaj qhov tsis zoo los ntawm ob-theem lim dej topology: passive LC input filter (txiav tawm 150 Hz) ua raws li qhov ua haujlwm synchronous rectification theem uas txo cov zis ripple mus rau qis dua 3 mVrms thoob plaws tag nrho 0-30 V ntau yam. Lub siab-bandwidth yuam kev amplifier (tau txais bandwidth khoom 2.2 MHz) xyuas kom meej tias qhov hluav taws xob rov qab mus rau hauv ± 0.3% ntawm setpoint nyob rau hauv 80 µs tom qab 50% load kauj ruam - tus yam ntxwv tseem ceeb thaum fais fab ECU uas rub tawm tam sim no thaum lub sij hawm injector solenoid energization. Tsis zoo li cov khoom siv rau lub rooj ntev zaum dav dav, chav tsev tswj lub voj no tau ua kom zoo rau cov khoom siv hluav taws xob hauv lub tshuab hluav taws xob zoo ib yam ntawm cov kev tsheb ciav hlau injector actuation, tiv thaiv qhov hluav taws xob poob qis uas ua rau lub tshuab qhib qhib qeeb.

Cov khoom siv hluav taws xob zoo ib txwm muaj kev tiv thaiv overcurrent ruaj khov uas tsuas yog kaw, yuav tsum tau rov pib dua phau ntawv - tsis yooj yim thaum kuaj xyuas rov qab. Chav tsev no siv lub foldback tam sim no limiting yam ntxwv nrog ib tug built-in hysteresis band: thaum lub load tshaj lub teeb tam sim no txwv (adjustable los ntawm 0.5 A mus rau 20 A), cov zis voltage linearly txo kom tswj tau qhov tam sim no ntawm qhov txwv, es tsis txhob cuam tshuam cov khoom. Yog hais tias lub luv luv Circuit Court tshwm sim, qhov sib piv foldback poob tam sim no mus rau kwv yees li 30% ntawm tus nqi txwv, txo cov hluav taws xob dissipation hauv txoj kev txhaum thaum ua kom cov khoom muaj sia. Internal micro-controller tseem saib xyuas ob qho tib si voltage thiab tam sim no nqes hav; Yog tias dV / dt tshaj 5 V / µs (qhia txog qhov xwm txheej kub-swap lossis rov qab sib txuas), ib qho khoom siv hauv lub xeev relay cais cov zis tawm hauv 15 µs - nrawm txaus los tiv thaiv ECU input capacitors (feem ntau nyob ntawm 35 V). Lub pob rov pib dua rov ua cov zis tom qab tshem tawm qhov yuam kev, nrog lub teeb pom kev pom LED uas qhia "Tam sim no" lossis "rov qab".

Lub zog hluav taws xob muaj peb hom kev khiav hauj lwm sib txawv, xaiv tau los ntawm kev hloov pauv hauv pem hauv ntej vaj huam sib luag, haum rau cov haujlwm sib txawv diesel:

Tsis tu ncua Voltage (CV) hom- default rau ECU lub rooj zaum fais fab, nrog kho qhov hluav taws xob ntawm 0.5 V rau 30 V hauv 10 mV cov kauj ruam. Pom zoo teeb tsa rau 12V systems: 13.5 V ± 0.1 V (rau account rau alternator tso zis); rau 24V: 27.0 V ± 0.2 V. Lub tsev tswj kev tswj hwm txawm tias qhov kev thov tam sim no hloov pauv ntawm 0 thiab tag nrho cov khoom ntsuas.

Tsis tu ncua tam sim no (CC) hom- siv rau kev ntsuas roj ntsuas li qub lossis injector solenoids nrog kev paub txog kev tiv thaiv. Los ntawm kev teeb tsa kev txwv tam sim no (piv txwv li, 2.5 A rau qhov raug 3Ω solenoid), cov khoom siv tau txiav tawm qhov hluav taws xob los tswj qhov tam sim no, tso cai rau tus kws tshaj lij los txheeb xyuas cov solenoid tsis muaj kev pheej hmoo thermal puas.

Roj teeb Simulation hom- ua raws li kev tiv thaiv sab hauv ntawm lub roj teeb lead-acid (xaiv tau 0.01 Ω txog 0.5 Ω) siv lub zog hluav taws xob hluav taws xob impedance. Hom no yog qhov tseem ceeb thaum ua qhov kev ntsuam xyuas ECU sawv, raws li ntau ECUs xyuas cov roj teeb sab hauv ua ntej ua kom lub ntsiab relay.

128 × 64 OLED zaub qhia tau hais tias lub sijhawm tiag tiag ntawm qhov hluav taws xob, tam sim no, lub zog, thiab hom xaiv, nrog rau daim duab qhia txog qhov feem pua ​​​​ntawm cov khoom thauj. Lub tsev kuj tseem muab 5 V / 1 A pab tso zis rau lub zog rau sab nraud sensors lossis siab transducers thaum kuaj.

Tsim los rau cov kws tshaj lij kev kho cov khw muag khoom, cov chaw pabcuam txawb, thiab kev teeb tsa lub rooj zaum, cov khoom siv hluav taws xob no txhawb nqa:

ECU lub rooj zaum programming- ruaj khov 13.5 V lossis 27 V muab rau flash re-programming, qhov twg qhov hluav taws xob poob qis dua 11 V tuaj yeem cuam tshuam lub bootloader. Chav tsev qhov tso zis tsawg impedance (tsawg dua lossis sib npaug li 5 mΩ ntawm DC) ua kom ntseeg tau tias qhov kev ua haujlwm tam sim no mus txog 8 A ua rau tsis muaj hluav taws xob sag.

Sensor simulation- Ua kom muaj qhov tseeb 5.00 V lossis 8.00 V cov lus qhia rau kev tsheb ciav hlau siab sensors, accelerator pedal txoj hauj lwm sensors, thiab tso cua kub sensors, tso cai hla kev kuaj tawm tsam ECU cov ntaub ntawv sab hauv.

Kev ntsuas kev ua haujlwm ntawm lub twj tso kua mis- tsav cov tshuaj solenoid ib leeg los ntawm kev siv 12 V mem tes (nrog rau kev txwv tam sim no) thiab saib xyuas qhov qhib / kaw lus teb ntawm oscilloscope; cov khoom siv lub suab nrov tsis cuam tshuam nrog kev ntsuas.

Actuator functional check- Lub zog EGR li qub, VGT actuators, thiab lub siab tswj li qub, txheeb xyuas lawv cov neeg kho tshuab stroke yam tsis tau pib lub cav.

Cov khoom siv tau txais ob qho tib si 110 V thiab 230 V AC input (auto-sensing), ua rau nws tsim nyog rau qhov chaw ua haujlwm thoob ntiaj teb. Lub tshuab ua-hauv 40 hli txias kiv cua ua haujlwm ntawm qhov sib txawv ntawm qhov ceev, raws li qhov kub ntawm lub dab dej kub, ua kom nrov nrov hauv qab 45 dBA hauv ib txwm muaj.

Q1: Cov khoom siv hluav taws xob no puas tuaj yeem siv los dhia-pib lub cav diesel lossis crank tus pib?
Tsis yog - qhov siab tshaj plaws tam sim no yog 20 A, thaum lub cev muaj zog pib kos ob peb puas amperes. Chav tsev no yog nruj me ntsis rau kev tswj hluav taws xob tswj qhov kev kuaj xyuas thiab ntsuas cov khoom siv; tsis txhob sim crank lub cav nrog nws.

Q2: Qhov kev txwv tam sim no txawv li cas los ntawm tus qauv tsis tu ncua-tam sim no?
Nyob rau hauv tas li ntawd-tam sim no hom, cov khoom nquag tswj tam sim no mus rau lub teeb nqi tsis hais txog ntawm load kuj, tsuav yog qhov yuav tsum tau voltage nyob rau hauv ntau yam. Hauv foldback, cov khoom siv txwv tam sim no tsuas yog thaum lub sijhawm dhau los lossis luv luv, txo qhov tam sim no mus rau qib kev nyab xeeb (30% ntawm qhov teeb tsa) thiab tom qab ntawd rov qab mus ua haujlwm CV li qub thaum qhov txhaum raug tshem tawm - nws yog kev tiv thaiv tus cwj pwm, tsis yog hom kev cai.

Q3: Puas yog qhov auxiliary 5V tso zis cais tawm ntawm lub ntsiab tso zis?
Yog lawm, 5V / 1A auxiliary tso zis yog galvanically cais (1,500 V cais) thiab tswj nyias. Nws yog qhov zoo tshaj plaws rau kev siv hluav taws xob sab nraud lossis cov ntaub ntawv loggers yam tsis tau qhia cov voj voog hauv av uas tuaj yeem ua rau lub ntsiab ECU muab ntsuas.

Q4: Yuav ua li cas yog tias kuv txuas cov zis mus rau lub roj teeb lossis lub capacitor them thaum cov khoom siv tsis raug?
Chav tsev muaj xws li ib tug reverse-voltage tiv thaiv diode thiab ib tug solid-state relay uas blocks tam sim no ntws los ntawm cov zis rov qab mus rau hauv lub mov. Txawm li cas los xij, peb pom zoo kom tshem tawm cov khoom siv hluav taws xob sib txuas ua ntej kev sib txuas kom tsis txhob muaj kev cuam tshuam ntev; Cov khoom siv hluav taws xob pib hluav taws xob txwv tsis pub nkag mus rau 0.5 A txawm tias muaj lub capacitor tam sim no.

Q5: Kuv puas tuaj yeem ntsuas qhov voltage thiab tam sim no nyeem kuv tus kheej, lossis kuv yuav tsum xa rov qab?
Cov khoom siv muaj pem hauv ntej-vaj huam sib luag calibration trim pots nkag tau nyob rau hauv ib tug me me npog - koj muaj peev xwm kho offset thiab nce siv ib tug paub tseeb multimeter. Ib tug calibration lo lus zais (muab nyob rau hauv phau ntawv qhia) yuav tsum tau nkag mus rau hauv lub internal calibration ntawv qhia zaub mov, tiv thaiv kev huam yuaj. Peb pom zoo kom recalibration txhua ob xyoos.

Q6: Yuav ua li cas cov khoom siv ntsuas kub ambient kub hauv lub rhiav thaum lub caij ntuj sov?
Cov kiv cua sib txawv-ceev ceev thiab lub dab dej loj loj tso cai rau kev ua haujlwm tas li ntawm 40℃ambient ntawm tag nrho cov load yam tsis muaj derating. Ntawm 50℃ambient, qhov kev txwv tam sim no tau txiav txim siab los ntawm 5% ntawm ib qib siab tshaj 40 los tiv thaiv cov khoom siv hluav taws xob sab hauv - qhov no tau tshwm sim ntawm qhov screen raws li qhov taw qhia derating.

 

Txhawm rau ua kom koj qhov kev yuav khoom tau yooj yim thiab yooj yim, peb muab ntau yam kev xaiv them nyiaj ruaj ntseg:

Peb nyob ntawm no los ua kom koj cov txheej txheem xaj kev txhawj xeeb-dawb - xaiv txoj kev them nyiaj uas ua haujlwm zoo tshaj rau koj!

 

 

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