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> Carburatie / Monopunct / Multipunct, care, cum, ce?

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Andrei87
post 28 Oct 2006, 22:17
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Din lipsa de prea multe cunostinte tehnice, am vrut sa pun intrebarea asta, sa aflu mai multe despre cele trei concepte enumerate mai sus...

Carburatie ... cat de cat stiu ce face, in carburator intra aer, pompa de benzina ii da benzina, vaporii de aer si benzina formeaza amestecul de carburant pe care cilindrii si-l trag din galeria de admisie ...

Injectia monopunct din cate am inteles nu difera foarte mult de carburatie, injectorul luand locul carburatorului iar amestecul este controlat de calculator (adica e controlata cantitatea de benzina injectata) dar cilindrii isi trag in continuare amestecul necesar din galeria de admisie.

Sunt curios la multipunct in schimb ... MPI-ul de pe dacii (motoarele de la SN incoace) = injectie directa (injectorul baga benzina direct in cilindrii?).


Last question: care sunt avantajele fiecareia? Ma gandesc ca principalul ar fi economia de carburant, amestecul fiind controlat mai bine in cazul injectiei ... dar alte diferente? (Lipsa nevoii de reglaje manuale nu intra vreau sa intre la capitolul asta... ignorand lenea de a face reglajele, ce avantaje propriu-zis aduce injectia?)

This post has been edited by Andrei87: 28 Oct 2006, 22:18


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Liv05
post 28 Oct 2006, 22:34
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QUOTE(Andrei87 @ 28 Oct 2006, 23:17)

Sunt curios la multipunct in schimb ... MPI-ul de pe dacii (motoarele de la SN incoace) =  injectie directa (injectorul baga benzina direct in cilindrii?).
*



Injectia directa este deobicei la motoarele diesel. Din cate stiu eu, la motoarele pe benzina, la presiunea la care ar fi injectata benzina de catre o injectie directa aceasta ar exploda...cred intrebare.gif


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hash
post 28 Oct 2006, 22:35
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http://auto.howstuffworks.com/fuel-injection.htm


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bertoceanu
post 10 Sep 2008, 09:06
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Injectia directa era intalnita pana de curand numai la motoarele Diesel. La benzina problema principala era aparitia autoaprinderii, care este un fenomen necontrolat si deloc indicat. In schimb, daca nu ma insel, VW au reusit sa controleze aceste autoaprinderi si de 1 an incoace, cred, injectia directa se intalneste si la MAS.

Injectia monopunct inseamna ca exista un singur injector aflat in galeria de admisie si benzina ajunge in camera de ardere prin acelasi principiu ca la carburator.

In cazul injectiei multipunct exista cate un injector pentru fiecare cilindru, iar benzina nu mai este pulverizata in galeria comuna de admisie, ci in poarta supapei de admisie a fiecarui cilindru.


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ArtVandelay
post 10 Sep 2008, 09:31
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sunt si motoare pe benzina cu injectie directa , exemplu FSI


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Andrul
post 10 Sep 2008, 10:53
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La motoarele MPI de pe Logan injectia este directa in volum, adica direct in cilindru. Injectia IDV exista de ceva timp, nu este nici pe departe un boom ingineresc aparut recent.


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Oskar
post 10 Sep 2008, 10:58
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Parca si Renault are un motor pe benzina cu injectie directa (2.O IDE de pa Laguna II)


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vi_escu
post 10 Sep 2008, 11:02
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QUOTE(Andrul @ 10 Sep 2008, 10:53)
La motoarele MPI de pe Logan injectia este directa in volum, adica direct in cilindru.
*



Chiar? nono.gif


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argon
post 10 Sep 2008, 11:04
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da, cantitate injectata pentru un singur cilindru ajunge toata in cilindrul respectiv, probabil la aia se referea.


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einstein1984
post 10 Sep 2008, 11:59
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La logan MPI nu e nici o injectiede benzina directa , e indirecta, adica in poarta supapei. Injectoarele sunt in galeria de admisie, nu in chiulasa.
Argon, tu cui dai dreptate?
PS: Injectie monopunct poate f si cu 2 injectoare, si se nuemste asa daca amestecul pentru mai multi cilindri e format intr-un singur loc (adica nr injectoare< nr cilindri)

This post has been edited by einstein1984: 10 Sep 2008, 12:04


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argon
post 10 Sep 2008, 12:52
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exprimarea a fost ambiguua, si daca se referea la altceva nu va recunoaste biggrin.gif Multa apa va mai trece pe Dunare pana baga Dacia Gdi(denumita si fsi de unii).


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Andrul
post 10 Sep 2008, 18:00
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Recunosc biggrin.gif am gresit nu e injectie directa m-am documentat.


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Asi
post 10 Sep 2008, 19:07
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exista injectie directa si la benzina nu neaparat de curand.. vezi motoarele gdi de la mitsubishi carisma (a mea e diesel, dar am mers si cu gdi-ul lor de 1.8L si e foarte ok, 86kw se comporta onorabil.. dar consuma cam mult)
http://en.wikipedia.org/wiki/Gasoline_direct_injection

(sa nu se inteleaga ca sunt fan asa infocat cu mitubishi.. ca mi-am amintit prostia lor cu gdi-ul asta.. pai bine, au pus injectie directa dar in desteptaciunea lor motorul este SOHC.. mda.. un dohc ar fi fost mai bun.. - era gdi dohc doar de 2.0 pe lancer, ala 2.4 de pe galant tot sohc este) - un pic stupid dar poate au avut motivele lor
Asa ca de aia are numa 86kw.

This post has been edited by Asi: 10 Sep 2008, 19:19


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ArtVandelay
post 10 Sep 2008, 19:45
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&eurl=http://www.automarket.ro/stiri/video-cum-functioneaza-injectia-directa-audi-fsi-6693.html


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