khai quat ve dong co diesel 9t 1123

8/6/2019 Khai Quat Ve Dong Co Diesel 9t 1123

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-1-

ng c Diesel

M T

ng c diesel s dng nhin liu diesel.N to ra cng sut cao tc thp vc cu to vng chc. Tnh kinh t nhinliu tt hn so vi ng c xng.

(1/2)

S khc bit gia ng c xng v ng

c dieselNgoi s khc nhau v loi nhin liu mng c s dng, ng c xng v dieselcn s dng nhng c cu khc nhau.

Bung chyng c diesel khng c trang b h thngnh la c bugi. Thay vo , nhit sinh ratrong qu trnh nn s lm cho nhin liu t bcchy. V vy t s nn c t cao hn.

H thng sy s b h tr cho kh nng khi ng ca ng c,ng c diesel c mt h thng sy s b s

dng bugi sy sy nng kh np.H thng nhin liung c diesel c mt bm nhin liu v ccvi phun phun nhin liu vo trong bungchy p sut cao.

(2/2)

C Cu Sinh Lc Hot ng

to ra nng lng chuyn ng cho xe,ng c 4 k thng thng s lp li bnchu k hot ng nh trong hnh v sau.

Khng ging nhng c xng, ng cdiesel khng c h thng nh la.Thay vo , nhin liu c nn vi psut cao phun vo khng kh c p sut vnhin cao nhm lm cho nhin liu tbc chy.

Xupp npXupp xVi phunBung chyPttng

Thanh truynTrc khuuS cho thy ng c c bung chy loi xoy lc.

(1/5)


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K npXupp xng v xupp np m. Hnhtrnh i xung ca pttng chht khng khvo trong xylanh qua xupp np lc nyang m.

(2/5)

K nnKhi pttng hon tt hnh trnh i xung,xupp np ng li. Vi hnh trnh i ln

ca pttng, khng kh c ht vo trongxylanh b nn mnh v t n nhit cao.

T s nn ca ng c diesel = 15 n 23(khong 2 n 3 ln so vi ng c xng).Nhit bung chy = 5000n 8000C.

(3/5)

K chyKhi pttng gn hon tt hnh trnh i ln,vi phun s phun nhin liu di p sutcao vo khng kh t n p sut vnhit cao.Nhit cao ca khng kh lm cho nhinliu t bc chy, kt qu gy nn chy vn.Lc ca s chy ny sn pttng ixung v lm quay trc khuu.

(4/5)


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K xXupp x m ra khi pttng hon tt hnh trnhi xung.Sau hnh trnh i ln tip theo ca pttng slm kh x, sn phm ca qu trnh chy, byra khi xylanh.

(5/5)

Bung ChyBung chy bao bm khong khng to bi gia

pttng, thn my v np quylt.Loi xoy lc

Thng thng bao gm mt bung chy xoy lchnh cu trn nh ca bung chy chnh. Bungxoy lc ni vi bung chy chnh bng mt khethng. Trong qu trnh nn, khng khi i vo bungxoy lc to nn xoy lc mnh. Vi phun s phunnhin liu vo trong bung xoy lc

Loi phun trc tip

Bao gm bung chy chnh c to thnh gia npquylt v ptng v nhin liu c phun trc tip tvi phun vo bung chy

Bung chy chnh

Bugi syVi phunBung xoy lcKhe thng

(1/1)

ng c xng (c bm ga)

ng c diesel (khng c bm ga)

Lng nhin liu phun nhLng nhin liu phun ln

iu Khin Cng sutng c diesel da trn hin tng t bcchy do nhit trong k nn ca khng kh np to nn s chy, n yu cu mt lng lnkhng kh. Do , ng c khng c bm ga.

ng c xng iu khin cng sut ra ca nbng cch s dng bm ga iu khinlng hn hp khng khnhin liu ht votrong xylanh.Ngc li, ng c diesel iu khin cng sutpht ra bng cch iu khin lng nhin liuphun vo. Bi v n khng c bm ga vlng khng kh np l khng i.V d, cng ca ngn la thay i khingi ta di chuyn nm iu khin ca bp ga. l do lng ga thay i.Tng t nh vy, khi li xe p bn p gaca xe c ng c diesel, lng nhin liu phunvo trong xylanh s tng ln, do n lm tngcng sut ra ca ng c.

(1/1)


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H Thng Nhin Liu M T

H thng nhin liu ca ng c dieselphun nhin liu c p sut cao vo trongbung chy, c khng kh cnn li n p sut cao.iu ny cn thitbc bit khng ging nhng c xng.

Bnh nhin liu

Tch tr nhin liuLc nhin liu c b lng nc

Loi b cht bn v nc ra khi nhin liuBm cao p

Nn v bm nhin liuVi phun

Phun nhin liu

(1/1)

THAM KHO:Dng chy nhin liu

(1/1)

Lc Nhin Liu

Thit b ny loi b bi bn v nc ra khinhin liu bo v bm cao p v viphun, chng c cc chi tit c ch tort chnh xc. Bi bn v nc phi cloi b khi nhin liu trnh cho bm

cao p khi b kt hay gdo bm cao pc bi trn bng nhin liu diesel.

Bm xLc nhin liuB lng nc

(1/1)


5/9

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Bm Cao pC hai loi bm cao p dng trong ng cdiesel:Bm cao p loi c kh, n iu khin lngphun v thi im nhin liu bng c kh.Bm cao p in t dng ECU (Biu khinin t) trong h thng EFI-D (Diesel phunnhin liu in t).

Bm cao p c khBm cao p in t

Bm cao pVi phunai dn ngECUCm bin

(1/4)

Bm cao p nn nhin liu v bm n ncc vi phun.

Lng phun nhin liu v thi im phunnhin liu c iu khin bng c kh tytheo mc p chn ga v tc ngc.

(2/4)

THAM KHO:

Cc loi bm cao pC hai loi bm cao p: bm cao p loi phnphi, bm ny c mt pttng bm dng nnnhin liu to p sut cao v loi bm cao pthng hng, bm ny c nhiu ptng bng vis xylanh ca ng c.

Bm cao p loi phn phi

Cn c gi l bm VE*, loi bm ny gnv nh n c dng trong ng c ca xe dulch v xe ti nh.*VE: Vit tt ca t tingc "VerteilerEinspritz".

Bm cao p loi thng hng

Bm cao p loi thng hng c cu to phctp do n c nhiu pttng bm. N c dngch yu cho ng c xe ti

Nhin liup sut thpPttng bmp sut caoVi phun

(1/1)


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Diesel EFI (H thng phun du diesel int)C hai loi h thng Diesel EFI:Diesel EFI loi thng thngDiesel EFI loi phn phi1. Diesel EFI loi thng thngH thng ny s dng cc cm bin phthin gc m ca bn p ga v tc ng c

v ECU xc nh lng phun v thi imphun nhin liu.Nhng c cu iu khin dng cho qu trnhbm, phn phi v phun da trn h thngdiesel loi c kh.

ECUCc cm binBnh nhin liuLc nhin liuBm cao pVi phun

(3/4)

Diesel EFI2. Diesel EFI loi ng phn phiNhin liu c nn li bi bm cp liu ctch trong ng phn phi trc khi phn phin cc vi phun. Mt ECU (biu khin int) v EDU (B dn ng in t) iu khinlng phun v thi im phun nhin liu nmc ti u bng cch m v ng cc viphun theo tn hiu t cc cm bin. Qu trnhny tng t vi h thng EFI dng trong ngc xng.

Bm cp liu

ng phn phiCm bin p sut nhin liuB gii hn p sutVi phunCm binECUEDUBnh nhin liuLc nhin liuVan mt chiu

(4/4)

Vi PhunB phn ny nhn nhin liu c p sut cao tbm cao p v phun n vo trong bung chy.Khi p sut ca nhin liu c bm ln bi bmcao p vt qu ti ca l xo p sut, lc ny sy kim ca vi phun i ln.iu lm cho l xop sut b nn li v nhin liu c phun votrong bung chy.p sut nhin liu c thc iu chnh bngcch thay i chiu dy ca tm m iu chnh,n s thay i ti ca l xo p sut c hiu qu.

L xo p sutKim phun

Thn vi phunm iu chnh

(1/1)


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H Thng Sy S B

H thng sy s bTrong khi khi ng mt ng c lnh haykhi nhit thp, nhit sinh ra do qu trnhnn s khng . H thng sy s b ssy nng khng kh np nng cao kh

nng bc chy ca nhin liu. H thng nydng dng in ca c quy sy nngkhng kh.

C hai loi h thng sy s b:

Loi bugi sy:

Sy bung chy

Loi sy kh np:

Sy khng kh np

Bugi sy

Cun dy sy(1/1)


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Cu hi -1

Hy nh du cc cu sau y lng hay Sai.

No. Cu hi ng hoc SaiCu trli ng

1 T s nn ca ng c diesel dng trong t l t 9 n 12. ng Sai

2Trong ng c diesel, nhin liu c p sut cao c phun vokhng kh c p sut nhit cao c nn li bi pttng.Nhit ca khng kh c nhit cao lm cho nhin liu t bc chy.

ng Sai

3ng c diesel c bung chy loi xay lc c mt h thng sy sb do n khng tht c nhit do qu trnh nn trong khikhi ng mt ng c ngui hay hot ng di nhit thp.

ng Sai

4Lc nhin liu ca ng c diesel c chc nng t chy nc ctrong nhin liu. ng Sai

5 Bn k ca ng c diesel 4 k ging nh bn k ca ng cxng. ng Sai

Cu hi -2

Cu no trong cc cu sau y lin quan n h thng phun nhin liu loi ng phn phi l ng?

1. H thng ny iu khin thi im phun theo gc m ca chn ga v tc ng c bng ckh.

2. ng phn phi tch nhin liu m c hm nng bi bm cp liu. Khi nhin liu t n

gi tr nhit nht nh, vi phun s m ra phun nhin liu.

3. ng phn phi tch nhin liu c nn li bi bm cp liu. ECU xc nh lng phun vthi im phun nhin liu bng cch iu khin m v ng cc vi phun.

4. ng phn phi ha trn nhin liu vi khng kh v ECU iu khin lng phun nhin liu phthuc vo gc m chn ga v tc ng c.

Cu hi-3

Cu no trong cc cu sau y lin quan n h thng phun Diesel EFI loi thng thng l ng?

1. H thng ny s dng cc cm bin xc nh gc m ca bn p ga v tc ng c, rixc nh lng phun v thi im phun nhin liu bng c kh.

2. H thng ny s dng cc cm bin xc nh gc m ca bn p ga v tc ng c, rimy tnh xc nh lng phun v thi im phun nhin liu.

3. H thng ny xc nh gc m ca bn p ga v tc ng c bng c kh, ri my tnh xcnh lng phun v thi im phun nhin liu.


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4. H thng ny s dng cc cm bin xc nh gc m ca bn p ga v tc ng c, rimy tnh iu khin nhit kh np.

Cu hi-4

Hnh v sau y m tng c diesel loi bung chy xay lc. Hy chn nhng t tng ng vinhng s trong cm t.

a) Bugi sy b) Bung chy c) Bung xay lc d) Vi phun e) Vi phun khi ng lnh

Answer: 1. 2. 3. 4.

khai quat ve dong co diesel 9t 1123

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