Đánh giá đặc tính động cơ diesel RV125 2 dùng trong nông nghiệp

NGHIEN cufu - TRAO D6\ DANH GIA DAC T I N H DONG C a DIESEL RV125-2 DUNG TRONG NONG NGHIEP Le Viet Hung', Chiem Trdn Lam^ Trdn Dang Long^ Huynh Thanh Cdng^ Nguyin Anh Thi\ Do Van Dung^ ^Cdng ty TNHH MTV Dpng ed vd Mdy Ndng nghiep miln Nam (SVEAM) ^Phdng thi nghiem Trpng dilm DHQG-HCM Dpng ed ddt trong, Trfldng Dai hpc Bdeh khoaDHQG.HCM ^Trfldng Dai hpc Sfl pham Ky thudt TP.HCM T6M TAT Nghiin ciiu ddnh gid ddc tinh thdi, cdng sudt cua dgng cd Diesel RV125-2 diing ndng nghiep (cd cdng sudt cUc dgi 12,5 ML tgi 2400 vdng/phut) dUdc tiin hdnh theo chu trinh ECE R49 Chu trinh ECE R49 (vdi 13 diem do) dung dexdc dinh sii thay doi cua ddc tinh thdi, cong sudt, tiiu hao nhiin lieu thay doi cdc thdng sd van hdnh cua ddng cd Trong nghien ciiu ndy, ddc tinh cdng sudt phdt thdi tiidng Ung sii dung hai hi thdng bdm nhien lieu (dp sudt md vdi phun cua he thdng hien hitu 200 bar vd hi thdng mdi 220 bar) da dUdc vd ddnh gid Kit qud thii nghiem tdng dp sudt mdphun tii 200 bar den 220 bar cho thdy, cdng sudt cua dgng cd tdng 10%, sudt tieu hao nhien lieu hdu nhii khdng doi, hieu sudt nhiet tdng lin d tdi thdp ( lc:i - K i - l J 44 u L i i ' i i v j u ^ i ^ U i ' rtr'.i « I / i l r t ^ i'l 11 IM I I I t : K K.r > Hinh trinh bay sfl thay ddi cua hieu suat nhiet cua ddng cd hai trfldng hdp sfl dung I I li N II Hinh 4: Suat tieu hao nhilu liiu tai 13 dilm S603(Thang3nam2012;> NGHIEN cufu-TRAO 061 dp NOx thai giam 3.2 Dac tinh phdt thai cua ddng cd RV125-2 theo chu trinh ECE R49 Hi|n tai, Viet Nam chfla cd tieu chuan thai ddnh cho ddng ed diesel ndng nghiep mdt xylanh Dl cd cd sd ddnh gia thflc trang phat thai eua ddng cd RV125-2 hi?n hflu vile so sanh Hinh 5: Hieu suat nhi?t tai 13 diem vdi tieu chuan thdi TIER 2, eae thflc nghiem, vdi dp suat phun 200 bar, dfldc tiln hdnh dac, Tai dilm 6, tang dp suat phun (220 phdn tich, vd trinh bay bang bar), sfl hinh thdnh hdn hpp gifla nhien lieu dflpc phun vdo va mdi trfldng xung quanh la tdt hdn nln qua trinh chdy dien sach hdn nen sinh it CO hdn so vdi trfldng hdp sfl dung bdm nhien lieu ed dp thap hdn Tuy nhiln, tai diem sd (2400 vdng/phut), ddng ed van hdnh vdi dp suat phun eao cho ndng dp CO cao hdn trfldng hdp sfl dung dp suat phun thap Nguyen nhdn ehinh la sfl dung dp suat phun eao ldm gidm ^ ^ • • * > thdi gian chdy tre vd vi vdy thdi gian chdy ehinh mfn Addi hdn ldm lfldng CO dfldc hinh thdnh nhilu hdn Hinh 6: Nong dp CO tai 13 diem Ha^aih.l f l l i i l i B i i * A J *• I" "I 11 -* -II.•: I - ir lir I t N , l.tJ 11 >1 K I Sfl thay ddi ndng dp HC dflpc trinh bay Hinh Kit qua thu dfldc ed xu hfldng gidng vdi trfldng hdp cua CO Tai dilm sd 8, ndng dp HC ddng ed sfl dung he thdng bdm nhiln Heu mdi thi eao hdn so vdi sfl dung he thdng bdm nhiln heu hien hflu tren ddng ed vi qud trinh dot chdy nhiln lieu keo ddi hdn tde dp ddng ed tang cao nln se ldm tang Iflpng HC khdng chdy kip ngodi dfldng thai I >.' : " ; I.I ' 'li''»l •-• 1 1 t I 111 U] - 111 1:1 - h II] - ? il i \ iij - ã;/Nn I ô r I I I ¥ 'J I I I i 'i Hinh 7: Nong HC tai 13 diem Ndng dp NOx theo hai trfldng hdp dp sudt phun khdc dfldc trinh bdy hinh Tai tdi thap, ndng dp NOx ea hai trfldng hdp la chenh lech khdng dang ke Vd sfl sai khde nhilu nhat thu dflpc d diem sd (tfldng flng vdi 75% tdi va tdc dp 2400 vdng/phflt) Tai dilm nay, ndng dp NOx gidm khoang 25% dp suat phun tang tfl 200 bar den 220 bar) Khi dp suat phun nhien lieu tang, diesel dflpc phun tdi hdn, thdi gian chay tre dflpc rut ngan lai, qua trinh chdy khuyit tan keo ddi hdn, lam giam dp suat va nhiet dp tai qua trinh chay Do dd, ndng TAP CHf CO KHf VlfiT NAM -l