C1. he thong thong tin

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  • 1. PGS-TS o Van DungCHNG 1: HE THONG THONG TIN TREN OTO 1.1.TONG QUAT VE HE THONG THONG TIN TREN OTO1.1.1. Ly thuyet ve he thong thong tin tren oto Bang ong ho giup tai xe va ngi sa cha biet c thong tin ve cac he thong chnh trong xe. Bang ong ho s dung cac ong ho va cac en e hien th, bao hieu s hoat ong cua mot so bo phan quan trong tren oto. Bang ong ho buong lai thng bo tr cac loai ong ho sau: - ong ho toc o xe. - ong ho toc o ong c. - Von ke. - ong ho ap suat dau. - ong ho bao nhien lieu. - ong ho nhiet o nc lam mat. Ngoai cac ong ho tren, tren taplo con co cac en canh bao cac thong so qua mc, cac chc nang cua thiet b ien va s hoat ong khong bnh thng cua cac he thong. Nhn chung chung bao gom cac en sau: - en bao ap suat dau thap. - en bao sat.He thong ien than xe & ieu khien t ong tren OtoTrang 1

2. PGS-TS o Van Dung- en bao pha, cot. - en bao re. - en bao en canh bao (giong nh en bao xi nhan). - en bao xang sap het. - en bao he thong phanh. - en bao m ca.en bao hieu va en canhong ho en toc o bao ong ho ong cretoc o xebaoCac en bao hieu va en canh baoVon keong ho nhietong ho ap suat dauong hoo nc lamen baomatche o phanhien lieuHe thong ien than xe & ieu khien t ong tren OtoTrang 2 3. PGS-TS o Van DungTBELTen bao phanhen bao that day an toan cha ung v tr.en bao nhac thatenday an toan.lieu b ban, nghet.baolocnhienen bao mc ncen bao sat. enbaolam mat thap.aplcdau thap. en bao mc nht ong c.en bao re.en bao nguy.en bao ong c hoatongkhongen bao xong.bnh thng. en bao canh ca cha ong.en bao pha.Hnh 1.1: Cac loai ong ho ch th bang kim va cac ky hieu tren bang ong ho.A- Bao ap lc nht C- Bao nhiet o nhtE: Cac en baoong cHe thong ien than xe & ieu khien xang B- Bao ien ap D- Bao mc t ong tren Oto o xe F- Toc trnhG- Toc o H-Trang 3 Hanh 4. PGS-TS o Van DungHnh 1.2: Cau tao ong ho taplo loai hien so.1.1.2. Cau truc tong quat va phan loai he thong thong tin tren oto: 1.1.2.1. Cau truc tong quat: Bao gom cac ong ho sau: a-ong ho toc o xe: No bao gom ong ho toc o e ch toc o xe, ong ho quang ng e ch quang ng xe i c t luc xe bat au hoat ong va ong ho hanh trnh.b-ong ho toc o ong c. Ch th toc o ong c theo v/p (vong/phut) hay toc o truc khuyu ong c.c-Von ke. Ch th ien ap Accu hay ien ap ra cua may phat.d-ong ho ap lc nht. Ch th ap lc nht cua ong c.e-ong ho nhiet o nc lam mat. Ch th nhiet o nc lam mat ong c.f-ong ho bao nhien lieu. Ch th mc nhien lieu co trong bnh.g-en bao ap suat dau thap. Ch th rang ap suat dau ong c thap di mc bnh thng.He thong ien than xe & ieu khien t ong tren OtoTrang 4 5. PGS-TS o Van Dungh-en bao Accu phong ien.i-Ch th rang he thong nap hoat ong khong bnh thng. en bao pha, cot.j-Ch th rang en ang che o bat pha, cot. en bao xi nhan.k-Ch th en bao re phai hay trai. en bao nguy hoac u tien.l-Ch th rang ca en bao xi nhan phai va trai ang chp. en bao mc nhien lieu thap.m-Ch th rang nhien lieu trong thung nhien lieu sap het. en bao he thong phanh. Ch th rang ang keo phanh tay, dau phanh khong u hayn-bo thang qua mon. en bao ca m. Ch th rang co ca cha c ong chat. 1.1.2.2. Phan loai:He thong thong tin tren oto co hai dang: a.Thong tin dang tng t: Thong tin dang tng t (Analog) tren Oto la cac loai ong ho ch bao bang kim.b.Thong tin dang so: Thong tin dang so: (Digital) la loai ong ho hien th s dung cac tn hieu t cac cam bien khac nhau va tnh toan da tren cac tn hieu nay e xac nh toc o xe, roi hien th chung dang so hay cac o th dang thanh.He thong ien than xe & ieu khien t ong tren OtoTrang 5 6. PGS-TS o Van Dung1.1.3. Cac yeu cau cua he thong thong tin tren Oto: Do ac thu trong hoat ong cua oto nen he thong thong tin tren oto ngoai yeu cau oi hoi tnh my thuat phai am bao: - o ben c hoc. - Chu c nhiet o cao. - Chu c o am. - Co o chnh xac cao.He thong ien than xe & ieu khien t ong tren OtoTrang 6 7. PGS-TS o Van Dung+Hnh 1.3: S o cua mot tableau loai tng t1.2.THONG TIN DANG TNG T (ANALOG)He thong ien than xe & ieu khien t ong tren OtoTrang 7 8. PGS-TS o Van Dungay la he thong cac ong ho va cac en hieu e kiem tra va theo doi hoat ong cua mot so bo phan quan trong cua ong c cung nh toan xe.Hnh 1.4: ong ho ch th bang kim.1.2.1. ong ho va cam bien bao ap suat dau: ong ho ap suat dau bao ap suat dau trong ong c giup phat hien h hong trong he thong boi trn. ong ho ap suat dau la kieu ong ho lng kim. Cau tao. Toan bo c cau ong ho thng gom hai phan: bo cam bien, c lap vao carte cua ong c hoac nap bo loc dau tho va ong ho (bo phan ch th), c bo tr bang ong ho trc mat tai xe. ong ho va bo cam bien mac noi tiep vi nhau va au vao mach sau cong tac may. Bo cam bien lam nhiem vu bien oi tng ng s thay oi cua ap suat dau nhn thanh s thay oi cua cac tnHe thong ien than xe & ieu khien t ong tren OtoTrang 8 9. PGS-TS o Van Dunghieu ien e a ve ong ho o. ong ho la bo phan ch th ap suat nht ng vi cac tn hieu ien thay oi t bo cam bien. Thang o ong ho c phan o theo n v 2Kg/cm . Tren cac oto ngay nay co the gap bon loai ong ho ap suat dau nhn: loai ong ho nhiet ien, loai t ien, c kh n thuan va loai ien t. ay ch gii thieu hai loai la ong ho nhiet ien va loai t ien.ong ho ap suat nht kieu ong ho nhiet ien . Cau tao: Xem hnh 1.5 P h a t l g k i m n nB o t a o a s u a d a p t uD a m ay so yP h a t l g k i m n n D a m ay so y T ie ie p mC og n ta m a c y A ccuM ag n C a b ie a s u a d a m n p t uHnh 1.5: ong ho ap suat dau.He thong ien than xe & ieu khien t ong tren OtoTrang 9 10. PGS-TS o Van DungNguyen ly cua loai ong ho nay la cho mot dong ien i qua mot phan t lng kim c che tao bang cach lien ket hai loai kim loai hoac hp kim co he so gian n nhiet khac nhau.Nh he so gian n nhiet khac nhau, nen cac phan t lng kim b cong khi nhiet thay oi. Rat nhieu ong ho bao gom mot phan t lng kim ket hp vi mot day may so. Phan t lng kim co hnh dang nh hnh 1.6. Khi phan t lng kim b cong do anh hng cua nhiet o moi trng khong lam tang sai so cua ong ho.L g k im nAD a m ay so yK h o g s in h n h ie n tB c o n g b d o g ie i n nAHe thong iienh than xe & ieu khien t ong tren Oto S n h n ie tN h i e o k h o g c a o t n (K h o g s a i s o n )Trang 10 11. PGS-TS o Van DungHnh 1.6: Hoat ong cua phan t lng kim.Hoat ong: Ap suat dau thap/khong co ap suat dau. Phan t lng kim bo phan ap suat dau gan mot tiep iem va o dch chuyen kim ong ho t le vi dong ien chay qua day may so. Khi ap suat dau bang khong, tiep iem m, khong co dong ien chay qua khi bat cong tac may. V vay, kim van ch khong. Khi ap suat dau thap, mang ay tiep iem lam no tiep xuc nhe. Sau o co mot dong ien chay qua day may so cua cam bien va bo bao ap suat dau. V ap suat tiep xuc cua tiep iem nho, tiep iem lai m do phan t lng kim b uon cong do co dong ien nho chay qua. Do tiep iem pha bo cam nhan ap suat dau m khi dong ien chay qua trong mot thi gian rat ngan, nhiet o cua phan t lng kim trong bo ch th khong tang nen no b uon t. V vay, kim se lech nhe. o g h o b a a s u a d a n o p t uC og n ta m a c yA ccuC a b ie m n a suada p t uHe thong ien than xe & ieu khien t ong tren Oto K h o g c o a s u a d a n p t uTrang 11 12. PGS-TS o Van DungHnh 1.7: Hoat ong cua ong ho nhiet ien khi ap suat dau thap/khong co dau. Ap suat dau cao. Khi ap suat dau tang, mang ay tiep iem manh nang phan t lng kim len. V vay, dong ien se chay qua trong mot thi gian dai, tiep iem se m ch khi phan t lng kim uon len tren u e chong lai lc ay cua dau. Do dong ien chay qua bo bao ap suat dau trong mot thi gian dai cho en khi tiep iem pha cam bien ap suat dau m, nhiet o phan t lng kim pha bo ch th tang lam tang o cong cua no. Khien kim ong ho lech nhieu. Nh vay, o cong cua phan t lng kim trong bo ch th t le vi o cong cua phan t lng kim trong bo cam nhan ap suat dau.He thong ien than xe & ieu khien t ong tren OtoTrang 12 13. PGS-TS o Van Dung o g h o b a a s u a d a n o p t uC og n ta m a c yA ccuC a b ie m n a suada p t uA sua da cao p t uHnh 1.8: Hoat ong cua ong ho nhiet ien khi ap suat dau cao. ong ho ap suat dau loai t ien. Cau tao: Nh hnh ve di ay: B o c a b i e n m o g h o c h t h nC o g ta m a n c yHe thong ien than xe & ieu khien t ong tren OtoTrang 13 14. PGS-TS o Van DungHnh 1.9: ong ho ap suat dau nhn loai t ien. Chu thch hnh ve 1.9: a) S o chung. b) Vect t thong tong va v tr kim ong ho ng vi cac v tr khac nhau. c) S o nguyen ly au day. 1- Buong sap suat 11- La ong tiep ien 2- Chot t12- Day dan ong3- va 7- Vt ieu chnh13- Lo xo.4- Mang14- Can ong ho han che kim ong5- Vo bo cam bien15- Ranh cong.6- Tay on bay16 va 20- Nam cham vnh cu8- Con trt17- Khung chat deo9- Nap bo cam bien18- Kim.ho.10- Cuon ien tr cua bien tr 19- Vo thep cua ong ho. Rcb- ien tr cua bo cam bien. Hoat ong: Khi ngat cong tac may, kim ch th lech ve pha cua vach 0 tren thang so ong ho. Kim ong ho c gi v tr nay do lc tac dung tng ho gia hai nam cham vnh cu 6 va 20.He thong ien than xe & ieu khien t ong tren OtoTrang 14 15. PGS-TS o Van DungKhi bat cong tac may (ong ho lam viec) trong cac cuon day cua ong ho va bo cam bien xuat hien nhng dong ien chay theo chieu mui ten nh hnh ve 1.9.a va 1.9.c. Cng o dong ien, cung nh t thong trong cac cuon day phu thuoc vao v tr con trt tren bien tr 10. Cng o dong ien cc ai trong mach ong ho va bo cam bien 0,2A. Khi trong buong ap suat 1 cua bo cam bien co tr so ap suat P = 0 th con trt 8 nam v tr tan cung ben trai cua bien tr 10 (theo v tr cua hnh ve), tc la ien tr R cb co gia tr cc ai. Khi o cng o dong ien trong cuon W 1 se cc ai, con trong cac cuon day W 2 va W3 cc tieu. T thong 1 va 2 cua cac cuon W1 va W2 tac dung ngc nhau, nen gia tr va chieu t thong cua chung xac nh theo hieu 1 - 2. T thong 3 do cuon day W3 tao ra se tng tac vi hieu ot thong 1 - 2 di mot goc lech 90 . T thong tong cua ca 3 cuon day se xac nh theo qui luat hnh bnh hanh. se nh hng quay va v tr cua a nam cham 16, cung co ngha la xac nh v tr cua kim ong ho tren thang so. Khi bat cong tac ma ap suat trong buong 1 bang 0 va th t thong tong se hng da nam cham tru