Tuyen tap bao cao khoa hgc Hdi nghi Khoa hgc ky thuat Do Ifidng toan qudc lan thfi IV HaNpi, 11-2005 '/SU DUNG VISIOSCOPE VA INDICATING NGHIEN CUU QUA TRINH CONG TAC CUA DONG CO DIESEL DUNG HE T H N G NHIEN LIEU COMMONRAIL Nguyin Thi Luang, Khong Vu Qudng, Trdn Anh Trung, Pham Minh Tudn Trudng Dai hgc Bdch Khoa Hd noi Tdm tdt: Bdi bdo ndy trinh bdy kit qud nghien cidi thuc nghiem cdc qud trinh xdy bin budng chdy ddng ca diesel 5402 trang bi hi thdng nhiin lieu common-rail bdng cdng nghe Indicating vd Visioscope ky thudt sd tii'n hdnh tgi Phdng thi nghiem cua Bo mdn Ddng ccf ddt trong, Khoa Cff khi, Trudng Dgi hgc Bdch khoa Hd Ndi I DAT V^ DE Khi nghifin cfiu phat triin ddng co ndi chung, ngudi ta thudng phai xdc dinh dugc trfin ddng eo mdu qua trinh hinh thdnh va chay cua hdn hgp nhifin lifiu vd khdng khf, dl tfi dd xdc dinh dfigc dd thi cdng (difin biln dp sudt xy lanh) vd cac thflng sd kinh tl, ky thudt khde eua dfing eo Trfin co sd dd ed thi dua va tifi'n hanh eac giai phdp nhdm ndng eao cfing sudt, giam sudt tifiu thu nhifin lifiu va giam dfic hai khf thai Trong trudng hgp ddng co diesel, cdn phai xac dinh dugc diln bien cac qua trinh nhu phun nhifin lifiu, boa trfln nhifin lieu vdi khdng khf tao hfln hgp, hinh va lan trdn ciJa nggn Ifia va cac thflng sd nhu ap sudt budng chay, ap sudt phun, hdnh trinh kim phun theo gde quay true khuyu Di ldm duge diiu dd cdn phai ed cdc trang thifi't bi dde bifit Thang ndm 2004 tai trfidng DHBK Ha Ndi mdt phdng thf nghifim bifin dai vl ddng eo dfi't tri gia trifin USD dugc khanh vd di vao sfi dung Trong Phdng thf nghifim cd mdt hfi thdng thfi nghifim ddng bd cd thi thfic hifin dfigc nhfing nhifim vu nfiu trfin ggi Id phdng thfi nghifim ddng eO xy lanh (hinh 2.1a) Phdng thfi nghifim gdm ddng CO nghifin cfiu xy lanh diesel AVL 5402 diing hfi thdng nhifin lifiu common rail lap trfin bang thfi difin vd cde trang thifi't bi phu trg, thifi't bj lugng nhifin lieu tifiu thu, thifi't bj dd md cua khf thai Opacimeter, hfi thdng lam mdt nude va ddu, Visioscope AVL 513D quan sat vd chup anh budng chdy vd Indicating AVL 620 dl xdc dinh dd thi cdng va cdc thdng sd khdc Sau tiip nhdn, cac thifi't bi hifin dai ndi trfin da dugc tim hiiu vd khai thac trfin ddng co AVL 5402, qua dd rut nhihig nhdn xet va kinh nghifim budc ddu cung nhu tim hiiu de md rdng kha nang khai thac nhfing trang thilt bi II D I TUDNG NGHIEN CUU Ddng CO thi nghifim AVL5402 Id loai ddng co ddc bifit dfing dl nghifin cfiu vd phat triin (hinh 2.1 b) Ddy la dfing co bdn ky mdt xy lanh trang bi hfi thdng nhifin lifiu commonrail, cflng sudt ddng cO 12 kW, tdc dfl 4200 vdng/phfit, ty sd nin e = 17,1, dudng kuih xy 485 lanh D = 85 mm, hanh ttinh piston S = 90 mm Dfing co cfi thfi thay dfli dugc ty sfi nfin nhfl vific thay dfli hanh tnnh c i a piston Hfi thfing nhifin lifiu common-rail trang hi bfi difiu khien difin t i ECU, ECU dugc ke't nfli vfli phdn mfim Inca giup cho vific thay dfii lugng nhifin hfiu phun, thfli difim phun, lugng phun mfii chi'nh xdc Ndp xi lanh va mfit sfi vi m' khdc ttfin dfing CO khoan 16 dfi Idp cdc cam bifin (hinh 2.1c) giup cho viec nghifin cttu cdc qua ttinh bfin dfing eg bang cfing nghfi Visioscope va Indicating Cflng nghfi se dttgc ttinh bay ky hon dttfli day 5S±i a) Phdng thd nghiem b) Mat cdt dgc ddng ca c)Vi tri khoan ddt camera Hinh 2.1: Phfing thi nghidm dflng co mgt xylanh va ban ve mat eSt dpc dgng eo AVL 5402 III CONG NGHE VISIOSCOPE v A INDICATING 3.1 Visioscope AVL 513D 3.1.1 So ket nfli va nguyen ly lam vific cua he thong Visioscope (hinh 3.1) He thfing phdn cttng bao gfim mdy tinh, thifit bj cdp ngufin sang, camera, cdc day cdp ddn tin hifiu, cdc ddu nfii soi vfli cdc gfic vat: 0°, 30°, 60°, day cap ddn ngufin sdng Camera cfl dfl phan dai anh 1280x1024 pixels, cho phep chup t i 0,1° de'n 0,05° gflc quay ttuc khuyu, tfl'c dfl chup t i lOps dfin 10 ms, sfi lugng anh Ifln nhdt chup mflt giay Id 15 anh, nhiet dfl ldm viec dfin 3000 K Ddu nfli soi dttgc chia Idm hai loai Loai thtt nhdt ding cho buflng kin cfi dp sudt vd nhiet dfi thdp Loai t h i hai chiu dugc b)S-®fi kfit nii hfi dp sudt vd nhiet dfi cao Ddu nfli soi cfi