1KHOA H O C - C O N G NGHE<br />
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Stf DO MACH DIEN DIEU KHIEN SlT DUNG TIEP DIEM<br />
DlTtfI Gdc DO CHAN D O A N KY T H U A T<br />
TS. NGUYEN DUY VIET<br />
Trtfdng Dai hgc Giao thong van tai<br />
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Tom t i t : Mdt ham logic dUOc thtfc hien bdng song song hoae ndi tiep. Thude tinh n i y khdng dOOe<br />
mach dien tren cO sd cac tiep diem se cdn dUOc md thOe hien d e i e sP dd c i u , Vi dy sP dd nho the dope<br />
ta bdi cac ham chuin tuong dUOng, ma tran tUOng dOa ra d hinh 2. Trong c i c p h i n tiep theo se chi xem<br />
tfng cdng nhu ma Iran quan he. Cac md ta dd se lam xet c i c so dd song song - ndi tiep l i e i e so dd phd<br />
CO sd cho cdng tac chin doan ky thuat ddi vdi mach bien hon e i trong thyc te.<br />
dien trong thtfc te ldp dat, khai thae va bao dudng Dudng P trong sP dd ed tap hpp nhd nha't e i c tiep<br />
ky thuat. diem ma sy ndi mgch eua ehung hinh t h i n h nen<br />
Abstract: A logic function is performed by cir- dydng d i n giOa e i e cOc ben n g o i i cua so dd. Tren<br />
cuits on the basis of contacts will also be described hinh 1, e i e diem 1, 2 la c i c eye cua so dd v i ed s i u<br />
by the equivalent standard functions, the equivalent<br />
matrix as well as related matrix. Descriptions that dydng din, dd li: P^ = a,cf^. Pj = d,d^. Py = bc<br />
will form the basis for the diagnosis techniques for<br />
circuits installed in fact, operation and technical . P, = bd.. Ps = d^a,. P^ = f^a^<br />
maintenance.<br />
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Dat van d e : Cae mgch dien dieu khien ve cO b i n<br />
dope xay dOng tren cP sd cua bdn c i p thiet bj: e i e<br />
sP dd rple ed tiep diem (eP), sP dd c i e p h i n tO logic,<br />
e i e he thdng vi xO ly ( m i y tinh) va e i e thiet bj tOPng<br />
to. Mgch dien cija c i c he thdng dieu khien tfn hieu<br />
(dodng s i t ) cua node ta hien nay chij yeu l i e i e so dd<br />
role cd tiep diem, Chan d o i n , kiem tra chung tO khi Hinh 2. So do cau<br />
s i n xuat, lap dat, khai thae, b i o dodng la nhiem vy<br />
a, h d2 J^<br />
quan trpng de dam bao dung chOc nang cua mach<br />
didn, dam bao an toan chgy tau. Vide kiem tra, c h i n<br />
doan se dPn gian va chinh x i e hPn khi thOe hien phan<br />
tich c i c so dd mach didn.<br />
No! dung: Cac sO dd rPle ed tiep diem se la e i c sP<br />
dd dope xay dyng tren eP sd ddng mach (trang t h i i<br />
hut cua rP le) va n g i t mgch (trgng t h i i nha cija rp le)<br />
cija cac tiep diem, Cd the nhan t h i y la mdt ham dai Hinh 3. So dd tiep diem dao<br />
sd logic b i t ky dope viet trdn eP sd {VA - AND, HOAC Thiet dien S trong so dd ed tap hpp nhd nhi't eic<br />
- OR, PHU DINH - NO) cd the dope thyc hien nhd sP tiep diem m i sy n g i t mgch eua nd b i o d i m ngat c i c<br />
dd tiep diem, Khi dd ham v A dope thyc hien nhd ndi dodng d i n giOa cae eye ben n g o i i eua sO dd. Sd do<br />
ndi tiep e i e tiep diem, ham HOAC - ndi song song hinh 1 cd s i u thiet dien, e i c bien tyong Ong vdi cac<br />
e i e tiep diem, ham PHIJ DjNH se la vide sO dyng tiep tiep diem cua thiet dien dope viet d dgng nghjch d i o<br />
diem n g i t mach, Hinh 1 dya ra so dd tiep diem thoc<br />
hien ham logic bdi cae tiep diem ein phai ngit mgch: i ~ ^pdiJi;<br />
F = (d V b\cf V d)v {d V f)a (1) ^'2 = a^bd^. S^ = cd,dj^. S. = cd.d<br />
l"2<br />
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S^ = f\d,d,f,, S,^= f^d,a^_<br />
Cd the nhgn t h i y r i n g khdng cd dodng bat ky va<br />
khdng cd thiet dien b i t ky dope thOe hien vi chung cd<br />
the ed mau t h u i n . Cy the, de thyc hien thiet dien<br />
a^boj e i n trong mdt thdi diem n g i t mgch bdi c i c tiep<br />
diem ddng va ngit mgch cua role A, dieu dd la khdng the.<br />
Ddi vdi eie so dd tiep diem tdn tai mdt sd dd<br />
nghich d i o eua nd, thyc hien ham nghjch 6aoF.<br />
Hinh 1. So dd song song - ndi tiep<br />
Cae sd dd dope xay dyng theo e i c quy djnh dope Ham nay nhgn dope tO sP dd gdc b i n g vide thay cac<br />
ehl ra va dupe gpi la cac sP dd song song - ndi tiep, tiep diem ndi mach thanh e i e tiep diem n g i t mach<br />
Tgi sd dd nay, hai tiep diem hai cOc b i t ky dope ndi va ngope lai, cQng nho thay vide ndi tiep e i c tiep diem<br />
KHOA HOC - CONG NGHE Tap chi GTVT 3/2011<br />
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cua hai eye tiep diem t h i n h song song va ngupe lai, MT d dgng an quy djnh DCT, Dieu dd xac dinh<br />
Tren hinh 3 doa ra sp dd la nghich d i o cua sO dd hinh djnh ly sau,<br />
1 dOOe tinh theo ham<br />
Djnh ly: De sao cho tap cac chO cua DCT<br />
F = abdf V acd v adf (2) A/|a,. ,o, ,,..,fl,„jhpp thanh hdi DCT, a, .a,^ a,„,<br />
e i n va du p h i i hoan thanh hai dieu kien:<br />
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"V" 1) c i c chO a. ,a. ,...,o,„, tOPng thich tOng cap;<br />
<br />
2) khdng tdn tgi e i e chO a,^ g A / ma ehu dd tu'Ong<br />
Hinh 4. Vi du cua ciu true tiep diem thieh vdi t i t c i e i e chO tO M.<br />
Cd the tha'y d e i e sP dd la nghjch dao cija nhau, Bang 2<br />
cae dodng eua mdt so dd tOPng Ong vdi thiet dien eua<br />
sP dd k h i e va ngope Igi. Chi? °, Q7 b c d. dl /, fl<br />
Cau true cua sP dd tiep diem dupe dOa ra d dang DCT<br />
tuyen c i c dodng. Bieu thOc nay dope gpi dang ehuan a, 1 1 1 1<br />
tOPng dOPng (DCT). Ddi vdi sP dd hinh 1 nd ed dgng: S^ 1 1 1 1 1<br />
b 1 1 I 1<br />
PDCT = «ic/i V d,d, V bcf, V bd, v a^d^ v aj^. (3)<br />
c 1 1 1<br />
C i c chO eua dgng ehuan tOPng dOPng (DCT) d, 1 1 1 1<br />
tOPng Ong vdi e i c tiep diem cdn cac hdi eua DCT<br />
dl 1 1 1 1 1 1<br />
tOdng Ong vdi c i c dodng eua sO dd, Dgng ehuan<br />
tOPng dOPng ngOpe (DCTN) md ta cau true cua sP dd /, 1 1 I 1<br />
tiep diem ngope tren hinh 3: fl 1 1 1 1 1 1<br />
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i^ncTN =
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