Coulomb okubala kye ki?
Nze mbadde mbuuzibwa ku SOC estimation emirundi mingi okusinga bwe nsobola okubala. Ekibuuzo kitera okujja nga pack y’omuntu eraga ebitundu 30% ku gaagi kyokka nga wayise eddakiika bbiri. Emirundi mwenda ku kkumi, ekikolo ekivaako kiddirira okutuuka ku Coulomb ng’okubala kugenda bubi.
Endowooza .
Coulomb counting tracks charge in ne basasula. Pretty simple ku lupapula. Ogatta current ng’obudde bugenda buyitawo, n’osigala ng’odduka, era omuwendo ogwo gukubuulira omubisi gwe gusigadde mu katoffaali.
BMS samples current-ebiseera ebisinga waliwo wakati wa 10 Hz ne 100 Hz okusinziira ku nkola-era buli sampuli efuna emirundi mingi okusinziira ku kiseera ekigere. Zisseeko. Ggyako ku busobozi bwo obw’okutandika. Waliwo ennamba yo eya SOC.
gye kituuka okuba ekibi .
Bino ebitabo ebisomesebwa bye bitaggumiza kimala. Sensulo eyo eriwo kati gy’osinziirako erina offset drift. Kirina ensobi efunye. Kirina omugerageranyo gw’ebbugumu. Automotive shunt eya bulijjo eyinza spec ku ±0.5%, naye eyo eri mu mbeera ennungi ku 25℃. Kisibe wansi wa hood mu Phoenix mu July, era otunuulira ennamba ez’enjawulo.
Nakola ku 48V mild hybrid program back in 2019. Twalina vishay shunt eyaweebwa rated ku 100 μω. Olupapula lwa spec olulungi. Mu laabu, buli kimu kyalondoola bulungi. Kiteeke mu mmotoka ng’okola buleeki ey’okuzza obuggya mu siteegi-era -Go traffic, era oluvannyuma lw’essaawa mukaaga SOC yali ewudde ebitundu 8%. The thermal mass of the shunt tesobola kukwatagana na biseera bya kaseera buseera. Twamaliriza nga twongerako sensa y’ebbugumu eyeewaddeyo ku shunt yennyini n’okuddukanya enkola y’okuliyirira mu firmware ya BMS.
Ekizibu kya low current .
Ono aluma abantu buli kiseera. Sensulo yo eya Hall Effect oba shunt yo erina wansi w’amaloboozi. Wansi mpozzi 500 mA ku pack ya EV eyabulijjo, signal-to-omugerageranyo gw'amaloboozi gugwa. Naye akatoffaali kakyali self-okusumulula. BMS ekyakuba akasannyalazo aka quiescent current. Aba contactors balina leakage.
Mu kiseera ky’okusimba wiiki bbiri{0{0}}, amasannyalaze gano amatono gagatta. Nze ndabye packs zifiirwa 3-4% SOC nti Coulomb counter tewandiisa. Nnyinimu akomawo okuva mu luwummula, gaagi eraga ebitundu 85%, naye obusobozi obwennyini buli kumpi ebitundu 81%. Ekyo kikole emirundi mitono, era amadirisa go aga realibration tegasobola kukwata.
Ttiimu ezimu ziddukanya enkola ya parallel self-okufuuwa. Abalala bamala kukaka OCV relibration oluvannyuma lw’ekiseera kyonna eky’okuwummula mu ssaawa 4. Tewali kuddamu kutuukiridde. Abantu ba ISO 26262 bajja kukubuuza engeri gy’okwatamu kino mu FMEA yo, era kirungi obeere n’akakodyo akawandiikiddwa.
Obusobozi buzikira .
Akatoffaali ke walaga mu kiseera ky’okukula si lwe katoffaali k’olina oluvannyuma lw’enzirukanya 500. Obusobozi obw’erinnya bukka. Obuziyiza obw’omunda bugenda waggulu. Naye Coulomb counter ekyo tekimanyi okuggyako ng’okitegeezezza.
TI's gauge ICs-Omutendera gwa BQ34, okugeza-Run internal impedance okulondoola era otereeze obusobozi bwa charge obujjuvu mu kiseera. Oyo ye model-enkola eyesigamiziddwa ku layeri waggulu ku basic Coulomb counting. Maxim 17205 ekola ekintu ekifaananako bwe kityo. Ku dizayini za BMS ez’enjawulo, kino okizimba ggwe kennyini, era kyetaagisa okukaddiwa data okuva mu kemiko w’obutoffaali bwo obw’enjawulo.
Obutoffaali bwa NCM bweyisa mu ngeri ya njawulo ku LFP wano. LFP erina flat voltage plateau eyo ekola OCV-okusinziira ku nnongoosereza kumpi nga tezirina mugaso mu 20-80% SOC range. Osibidde mu kwesigama ku Coulomb okubala ennyo, ekitegeeza nti obutuufu bwo obw’okutegeera obuliwo kati businga kukulu.
Okuddamu okukola mu nkola .
Full charge ye mukwano gwo. Voltage bw’ekuba termination threshold ne current tapers wansi wa C/20 oba kyonna ekikusalako, ozzaawo okutuuka ku 100%. Angu. Okwesigika. Ekola buli mulundi nga okitwala nti charger yo ne BMS zikkiriziganya ku "full" kye kitegeeza.
Enkomerero y’okufulumya amazzi erimu obukodyo. Okugulu kwa vvulovumenti kuba kwa bbanga, ebbugumu-okusinziira ku, era kukosebwa ebyafaayo by’omugugu ebisembyeyo. Enkola ezisinga teziddamu kugerageranya ku bwereere. Bamala kukozesa full charge nga anchor point era okwesiga okubala wakati.
Ebimu ku bifo ebiteekebwa mu bifo ebitali binywevu bikola okugezesa obusobozi bwa periodic capacity. Omulundi gumu mu mwezi, enkola eno ekola okufuluma okujjuvu okufugibwa n’okuzzaamu amaanyi. Ekyo kikuwa amazima ag’oku ttaka. Abaddukanya ebidduka nga balina EV oluusi nabo bakola kino. Kinyiiza mu nkola naye nga kigonjoola ekizibu kya drift.
Bye ŋŋamba bayinginiya abapya .
Coulomb okubala si algorithm ya mulembe. It's addition and subtraction n'ensonda nnyingi ez'ensobi. Obumanyirivu buli mu kutegeera ensobi we ziva n’okuba n’obukodyo okuzisiba.
Funa sensa yo gy'olondawo kati mu butuufu. Tegeera enneeyisa y’ebbugumu. Tegeka enkola yo ey’okuddamu okupima nga tonnaba kuwandiika layini emu eya koodi. Tegeka n’obutoffaali obw’amazima ku bbugumu erya nnamaddala wansi w’ebifaananyi by’emigugu egy’amazima. Bench setup nga erimu power supply ne electronic load tegenda kukulaga bizibu by’onoolaba mu nnimiro.
