Chn on ng c theoting n, mu khi, mi khi

Bi:

Khoa CNTT HSP KT Hng Yn

Chn on theo ting n

Ting n trong ng c bao gm hai loi chnh: ting n c kh v ting n qu trnhchy.

(1). Ting n c kh

Do mi mn, khe h cc chi tit tng ln gy ra va p, chnh l nguyn nhn gy n.Mi vng chi tit c ting n c trng khc nhau v xut hin cc ch khc nhau.

Qui trnh:

Cho ng c chy khng ti, pht hin ting g bt thng theo cc vng. Cho ng clm vic ch ton ti v 2/3 mc ti a ca s vng quay, pht hin ting g btthng cho cc vng.

Cc vng nghe ting g:

Vng 1: bao gm ting g ca xupp, con i, trc cam, m thanh pht ra nh, c bitr khi ng c ch khng ti.

Nguyn nhn:

Khe h ln gia ui xupp v cam hay con i.

v trc cam c khe h ln.

Mn bin dng cam

Chn on ng c theo ting n, mu khi, mi khi

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Hnh 4.2. Cc vng nghe ting g ng c

Vng 2: bao gm ting g ca sc mng, piston vi xi lanh, cht u nh, u nh vbc u nh thanh truyn, c bit r khi ng c lm vic ch thay i ti trng.V tr ting g tng ng vi v tr b tr trong xi lanh.

Nguyn nhn:

Khe h ln gia piston v sc mng, hay c th b gy sc mng.

Khe h gia piston v xi lanh ln, c th do mn phn y dn hng

piston. Mn nhiu xi lanh.

Khe h gia cht u nh, u nh v bc u nh thanh truyn

Vng 3: bao gm ting g ca trc khuu vi bc u to, m thanh pht ra trm, c bitr khi ng c lm vic vi ch thay i ti trng.

Nguyn nhn:

H hng bc u to vi trc khuu: mn bc, chy bc do thiu du bi trn.

B xoay nh v bc bin, mn, mo c trc

Vng 4: bao gm ting g ca trc khuu vi bc c trc chnh, m thanh pht ra trmnng, nghe r mi ch dc theo chiu di trc khyu, c bit r khi ng c lm vic ch thay i ti trng, v c khi s vng quay ln.

Nguyn nhn:

Chn on ng c theo ting n, mu khi, mi khi

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H hng trong phn bc c trc khuu vi trc khuu: mn bc, chy bc

do thiu du bi trn.

B xoay nh v bc bin, mn, mo c trc.

Mn cn dc trc khuu.

Lng c bt bnh

Vng 5: bao gm ting g ca cc cp bnh rng dn ng trc cam, m thanh

pht ra u, nghe r mi ch ti trng ng c.

Nguyn nhn:

Mn cc cp bnh rng cam.

trc bnh rng hng.

Cc loi ng c khc nhau s c cc vng nghe ting g khc nhau, v vy mun chnon ng phi nm vng kt cu cc loi ng c ngy nay b tr trn t, tm hiucc quy lut ca s c v rn luyn kh nng phn bit ting g tt (kinh nghim).

Xc nh ting n bng que thm hoc ng nghe

(2). Ting n qu trnh chy

Nguyn nhn do dao ng m thanh ca dng kh tc cao khi thot ra ngoi khquyn.

i vi ng c xng khi gc nh la sm khng ng gy ra ting n khc nhau.nh la mun my nng, ting n m ng thi c th c ting n trong ng x. nhla sm qu nghe ting n rn anh, nu kch n nghe c ting rt rt chi tai nh tingkim loi mit trn nn cng.

Cn ch phn bit hai loi ting n c th phn on chnh xc.

Chn on theo mu khi v mi khi

i vi ng c c th dng cm nhn mu sc chn on tnh trng k thut cang c. Thng qua cm nhn mu sc kh x, bugi (ng c xng), mu sc du nhnbi trn ng c.

Chn on ng c theo ting n, mu khi, mi khi

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(1). Mu kh x

a. Mu kh x ng c diesel:

Mu nu nht: my lm vic tt, qu trnh chy trit .

Mu nu sm chuyn en: my qu tha nhin liu.

Mu xanh nht (lin tc hay khng lin tc) mt vi xi lanh khng lm vic.

Mu trng: my thiu nhin liu hay nhin liu ln nc, r r nc vo bung t docc nguyn nhn khc nhau.

Mu xanh en: du nhn lt vo bung t do h hng sc mng, piston, xi lanh.

b. Mu kh x ng c xng:

Khng mu hay xanh nht: ng c lm vic tt.

Mu trng: ng c thiu nhin liu, hay tha khng kh do h ng np, bung t.

Mu xanh en hay en: hao mn ln trong khu vc sc mng, piston, xi lanh, du nhnlt vo bung t.

c. Mu kh x ng c xng hai k:

Tng t ng c xng, ngoi ra cn lu n nguyn nhn pha trn du nhn vonhin liu.

Mu xanh en: t l trn du nhn ln qu quy nh.

Mu trng nht: t l trn du nhn nh di quy nh.

Vic xc nh cht lng ng c thng qua mu kh x c th nh gi cht lng ngc nht l h thng cung cp nhin liu v nh la. Khi nh gi chung tnh trng kthut cn tham kho cc thng s khc.

(2). Mu chu bugi

Chu bugi c mu gch non (hng): ng c lm vic tt.

Chu bugi c mu trng: thiu nhin liu.

Chu bugi c mu en: tha nhin liu.

Chn on ng c theo ting n, mu khi, mi khi

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Chu bugi c mu en v t du: du nhn khng chy ht do mn sc mng-xi lanh,b kt sc mng, gy sc mng, hay hin tng lt du qua ng dn hng xu pp. Khiti nh mc nu tt th kh thi khng mu hoc mu nht.

Kim tra my b b c th bng cch nh cht my hoc s c x khi mi khi ng.Ni tt bu gi nh cht my trng hp ng c xng, ch ni t mt vo u caop, khng c ni ngc li. i vi ng c Diesel ni ng cao p ct du diesel.

(3). Mu du nhn bi trn ng c

Mu nguyn thy du nhn bi trn ng c khc nhau nh: trng trong, vng nht,xanh nht, nu nht. Sau qu trnh s dng mu ca du bi trn c xu hng bin thnhmu nu en. Vic xc nh cht lng ng c thng qua mu du nhn cn phi sosnh theo cng lng km xe chy.

Mu du nhn chuyn sang m nhanh hn khi cht lng ng c gim, do vy cn cmu du nguyn thy kim chng.

Hiu qu nht l pht hin cc mt kim loi nh: st, nhm, ng ln trong du nhn tonn mu ring bit ca kim loi c trong du nhn.

(4). Dng cm nhn mi

Khi ng c hot ng cc mi c th cm nhn c l: mi chy t sn phm dunhn, nhin liu, vt liu ma st. Cc mi c trng d nhn bit l:

Mi kht do du nhn r r b chy xung quanh ng c, do du bi trn b chy thotra theo ng kh x, cc trng hp ny ni ln cht lng bao kn b suy gim, dunhn b lt vo bung chy.

Mi nhin liu chy khng ht thi ra theo ng kh x hoc mi nhin liu thot ratheo cc thng p ca bung trc khuu. Mi ca chng mang theo mi c trng canhin liu nguyn thy. Khi lng mi tng c th nhn bit r rng th tnh trng kthut ca ng c b xu nghim trng.

Mi kht c trng t vt liu cch in. Khi xut hin mi kht, tc l c hin tngb t chy qu mc ti cc im ni ca mch in, t cc tip im c vt liu cchin nh: tng in, cc cun dy in tr, cc ng dy

Mi kht c trng t vt liu bng cao su hay nha cch in.

Nh tnh c trng ca mi kht c th phn on tnh trng h hng hin ti ca cc bphn ng c.

Chn on ng c theo ting n, mu khi, mi khi

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