Maziko a Magetsi a Magalimoto kwa Ophunzira a Uinjiniya
Uinjiniya wamagetsi wamagalimoto ndi maziko ofunikira kwambiri mu uinjiniya wa magalimoto opepuka komanso olemera. Pafupifupi makina onse amakono agalimoto—kuyambira kuyatsa, kuyambitsa, kuyatsa, kuyatsa, makina ojambulira mafuta, mpaka zinthu zotetezeka—amadalira mabwalo amagetsi ndi zamagetsi. Chifukwa chake, ophunzira uinjiniya ayenera kumvetsetsa mfundo zoyambira za uinjiniya wamagetsi wamagalimoto pang'onopang'ono: kuyambira mfundo zofunika kwambiri zamagetsi ndi zigawo zofunika kwambiri mpaka kuwerenga kwa madera, mpaka njira zodziwira zolakwika. Nkhaniyi ikufotokoza mfundo zoyambira izi ndi momwe zimagwiritsidwira ntchito m'magalimoto.
1. Mfundo zazikulu za magetsi: mphamvu yamagetsi, mphamvu yamagetsi, ndi kukana
Mu magetsi a magalimoto, kuchuluka kwakukulu kutatu komwe kuyenera kumvedwa ndi:
– Voltage (V/Volt): “kankhira” komwe kumapangitsa ma elekitironi kuyenda. Magalimoto ndi njinga zamoto nthawi zambiri amagwiritsa ntchito ma volt 12, pomwe magalimoto ena (malole, mabasi, zida zolemera) amagwiritsa ntchito ma volt 24.
– Mphamvu (I/Ampere): chiwerengero cha ma elekitironi omwe akuyenda kudzera mu kondakitala. Mphamvu imakhudzidwa ndi katundu (monga magetsi, mota yoyambira, fani ya radiator).
– Kukana (R/Ohm): kukana kuyenda kwa magetsi. Kukana kumachitika mu zingwe, zolumikizira, ma coil, kapena zotsutsana.
Ubale pakati pa atatuwa wafotokozedwa mwachidule mu lamulo la Ohm:
> V = Ine × R
> Ine = V / R
> R = V / I
Lingaliro ili ndi lothandiza kwambiri pofufuza chifukwa chake kuwala kuli kochepa (mphamvu yaying'ono chifukwa cha kukana kwakukulu), chifukwa chake fuse imaphulika (mphamvu yayikulu kwambiri), kapena chifukwa chake mota yoyambira ndi yofooka (kutsika kwa voteji chifukwa cha kukana kulumikizana).
2. Mphamvu yamagetsi ndi ubale wake ndi katundu
Kuwonjezera pa V, I, ndi R, ophunzira a uinjiniya ayeneranso kumvetsetsa mphamvu (P/Watt), yomwe ndi mphamvu yamagetsi yomwe imagwiritsidwa ntchito pa unit ya nthawi.
> P = V × I
Chitsanzo chosavuta: nyali ya 12 V 55 W pa galimoto imakoka pafupifupi mphamvu yamagetsi:
> I = P / V = 55 / 12 ≈ 4,6 A
Kuwerengera kotereku kumathandiza kusankha fuse yoyenera ndi kukula kwa chingwe, komanso kuneneratu kuchuluka kwa magetsi omwe adzagwiritsidwe ntchito.
3. Makina amagetsi a galimoto: gwero, kondakitala, katundu, ndi kuwongolera
Dera lamagetsi lamagalimoto nthawi zambiri limakhala ndi magawo anayi:
1. Gwero la mphamvu: batire ndi alternator.
2. Makontrakitala: zingwe, zolumikizira, ma terminal, ndi mizere ya pansi (pansi/thupi).
3. Katundu: magetsi, ma mota amagetsi (zopukutira, zopukutira), ECU, ma injector, ma ignition coil, ndi zina zotero.
4. Kulamulira ndi kuteteza: ma switch, ma relay, ma fuse, ma fusible links, ECU.
Kumvetsetsa zinthu zinayi izi kumathandiza pothetsa mavuto: kaya vuto lili ndi gwero, chingwe, katundu, kapena makina owongolera.
4. Mabatire ndi mfundo zawo zogwirira ntchito
Mabatire a galimoto nthawi zambiri amakhala ndi asidi wolemera. Ntchito zazikulu za batri ndi izi:
- Amapereka mphamvu yayikulu yoyambira.
- Imagwira ntchito ngati chokhazikika cha magetsi a dongosolo pamene katundu asintha.
- Amapereka magetsi injini ikazima.
Zinthu zofunika kuzimvetsa:
– Voltage ya batri yabwino injini ikazima nthawi zambiri imakhala pafupifupi 12,4–12,7 V (kutengera momwe zinthu zilili ndi kutentha).
– Mukayamba, mphamvu yamagetsi imatha kutsika, koma ndibwino kuti isatsike kwambiri. Kutsika kwa mphamvu yamagetsi kwambiri kungasonyeze kuti batire ndi yofooka kapena waya wolakwika.
- Ma terminal a batri akuda/ozizira amatha kuwonjezera kukana kwa magetsi ndikuyambitsa mavuto osiyanasiyana.
5. Dongosolo lochapira: alternator ndi regulator
Injini ikagwira ntchito, makina ochaja amapereka mphamvu zonse ndikuchaja batri. Zigawo zake zazikulu ndi izi:
– Alternator: imapanga magetsi a AC omwe amasinthidwa kukhala DC.
- Chosinthira mphamvu (diode): chimakonzanso mphamvu ya AC kukhala DC.
– Chowongolera magetsi: chimayang'anira kutulutsa kwa magetsi kuti kukhale kokhazikika (nthawi zambiri pafupifupi 13,8–14,5 V pa makina a 12 V).
Zizindikiro zodziwika bwino za kulephera kwa makina ochaja:
– Nyali yowunikira batri yayatsidwa.
– Batri imatha msanga.
– Magetsi amawala kapena kuzimitsa liwiro la injini ikasintha.
Kwa ophunzira a uinjiniya, ndikofunikiranso kumvetsetsa kuti ma alternator amapanga mphamvu zambiri, kotero zingwe zotulutsa, fuse yayikulu, ndi maulumikizidwe apansi ziyenera kukhala bwino.
6. Dongosolo loyambira: mota yoyambira, solenoid, ndi dera lowongolera
Dongosolo loyambira limatenga mphamvu zambiri kuchokera ku batire kuti ligwire injini poyiyambitsa. Zigawo zazikulu:
– Mota yoyambira: mota ya DC yokhala ndi mphamvu zambiri.
– Choyambira choyambira: chosinthira chamagetsi chomwe chimalumikiza mphamvu yayikulu ku mota yoyambira pomwe nthawi yomweyo chimakankhira giya ya pinion.
– Dongosolo lowongolera: chosinthira kuyatsa, chosinthira choyambira (pa magalimoto ena), ndi chitetezo (chosinthira chosalowerera/chosinthira cholumikizira/chosagwiritsa ntchito mphamvu).
Mavuto ofala:
- Phokoso la kudina koma osatembenuka: likhoza kukhala chifukwa cha batire yofooka, solenoid yolakwika, kapena kulumikizana kolakwika kwa mawaya.
- Kuzungulira kwakukulu kwa choyambira: kungakhale chifukwa cha kutsika kwa magetsi mu chingwe cha positive/ground, kapena mota yoyambira yotha ntchito.
7. Ma fuse, ma relay, ndi kufunika kwa chitetezo
– Fuse yapangidwa kuti isweke pamene mphamvu ya magetsi yapitirira malire, kuteteza zingwe ndi zigawo zake kuti zisatenthe kwambiri.
– Relay ndi switch yamagetsi yomwe imalola mphamvu yaying'ono kulamulira mphamvu yayikulu. Zitsanzo zikuphatikizapo ma relay a kuwala, ma relay a fan a radiator, ndi ma relay a pampu yamafuta.
Ophunzira mainjiniya ayenera kusiyanitsa pakati pa kuwonongeka:
– Fuse yobwerezedwa mobwerezabwereza: nthawi zambiri pamakhala kufupika kwa magetsi kapena kupitirira muyeso.
– Kutumiza kowonongeka: nthawi zambiri kumawonetsedwa ndi katundu wosagwira ntchito ngakhale kuti switch ndi yachibadwa.
8. Kutsika kwa nthaka (kulemera) ndi mphamvu yamagetsi
Mu magalimoto, thupi ndi chimango nthawi zambiri zimagwiritsidwa ntchito ngati njira zoyendera pansi. Izi zikutanthauza kuti si ma circuit onse omwe amafuna zingwe ziwiri kuti katundu ayende; chingwe chimodzi chabwino ndi chokwanira, ndipo mphamvu yamagetsi imabwerera m'thupi.
Komabe, kusakhazikika bwino kwa nthaka ndiye gwero lalikulu la mavuto:
– Magetsi ndi ofooka kapena osakhazikika.
- Sensa ikupereka kuwerenga kolakwika.
- Cholakwika cha ECU.
Pofuna kudziwa matenda, ophunzira a uinjiniya ayenera kumvetsetsa lingaliro la kutsika kwa magetsi. Mwachitsanzo, zingwe kapena zolumikizira zomwe zawonongeka zimawonjezera kukana, zomwe zimachepetsa mphamvu ya magetsi kufika pa katundu. Kuyeza kutsika kwa magetsi pogwiritsa ntchito multimeter nthawi zambiri kumakhala kothandiza kwambiri kuposa kungoyesa mphamvu ya magetsi ya batri.
9. Kuwerenga mawaya ndi zizindikiro zoyambira
Chithunzi cha mawaya ndi "mapu" a makina amagetsi a galimoto. Zizindikiro ndi malingaliro ena omwe amagwiritsidwa ntchito kawirikawiri ndi awa:
- Gwero la batri, fuse, relay, switch, nyali, mota, diode.
– Mzere wa pansi nthawi zambiri umakhala ndi chizindikiro cha misa.
- Nthambi za dera zimasonyeza kugawa katundu.
- Manambala a pini yolumikizira amathandiza kutsatira chingwe.
Kutha kuwerenga mawaya ndi luso lofunika kwambiri, chifukwa njira zamakono zodziwira matenda nthawi zambiri zimatanthauza njira zoyendera ndi malo oyezera.
10. Zida zoyezera zoyambira: multimeter ndi nyali yoyesera
Zida ziwiri zomwe zimagwiritsidwa ntchito kwambiri:
- Multimeter: imayesa mphamvu ya DC/AC, kukana, kupitirira, ndi mphamvu yamagetsi (m'njira zina).
– Nyali yoyesera: nyali yosavuta yoyesera kuti ione ngati pali magetsi komanso mphamvu ya dera loyendetsera magetsi.
Mfundo zachitetezo:
- Musayese kukana pa dera lomwe likugwirabe ntchito.
- Gwiritsani ntchito njira yoyenera.
- Samalani mukamayesa pa makina oyatsira moto chifukwa mphamvu ya magetsi imatha kukhala yokwera kwambiri.
11. Njira zoyendetsera mavuto mwadongosolo
Kuti mupewe matenda a "kuyesa ndi kulakwitsa", gwiritsani ntchito njira zotsatirazi:
1. Dziwani zizindikiro: zikachitika, momwe makina alili, ndi katundu wotani amene akugwira ntchito.
2. Chongani komwe kumachokera: momwe batire ilili, mphamvu yamagetsi pamene injini yazimitsidwa komanso kuyatsidwa.
3. Chongani chitetezo: fuse, fusible link, main relay.
4. Yang'anani kusinthasintha ndi zolumikizira: yang'anani kusasunthika, dzimbiri, ndi mapini opindika.
5. Yesani kutsika kwa magetsi pa mizere yabwino ndi ya pansi pamene katundu akugwira ntchito.
6. Kutsimikizira katundu: ngati gawo lokhalo lawonongeka (mota yatsekedwa, yasweka pang'ono, solenoid yofooka).
Njira imeneyi imaphunzitsa ophunzira kuganiza mwanzeru, moyenera, komanso motsatira miyezo ya ntchito za pa msonkhano.
Kutseka
Mfundo zazikulu za magetsi a magalimoto zimaposa kukumbukira zinthu zina, komanso zimaphatikizapo kumvetsetsa ubale womwe ulipo pakati pa magetsi, mphamvu, kukana, ndi mphamvu m'mabwalo enieni a magalimoto. Mwa kudziwa bwino malingaliro a mabatire, ma alternator, ma starter, ma fuse, ma relay, ma grounding, ma wiring diagram, ndi njira zoyezera, ophunzira opanga mainjiniya amatha kukonza ndi kuzindikira matenda molondola. Makina amagetsi a magalimoto adzapitilizabe kusintha kukhala makina amagetsi komanso ogwirizana, kotero maziko olimba ndi ofunikira pakuphunzira kwapamwamba, monga ma ECU, ma sensor-actuator, ndi makina a magalimoto ogwirizana ndi netiweki (CAN).
