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c a s d LY THUYET CAl TliN TANG AP TREN DONG CQ

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TIJ DONG CaXANG DANG LU'U HANH

THEORETICAL CALCULATION FOR SUPERCHARGING IN MOTORBIKE

ENGINE FUELED WITH LIQUEFIED PETROLEUM GAS CONVERTED

FROM CURRENTLY USED GASOLINE ENGINE

Nguyln Tien Han

Khoa Cdng nghe 6 td, Trudug Dai hoc Cdng nghiep Ha Npi

TOM TAT

Bdi bdo trinh bdy nghiin ciru mo phong lua chgn ty so tdng dp trin dgng ca xe mdy su dung

nhiin lieu khi chuyin doi tir dgng caxdng dang luu hdnh tgi Viit Nam. Gidi phdp cdi thien tinh ndng

ldm viic cua dgngca Id ldm tdng lugmg moi chdt ngp m&i vdo trong xy lanh trong moi chu trinh di

ndng cao cong sudt cua dgng ca khi su dung nhiin liiu khi bdng cdch sir mdy nen tdng dp. Cdn cu

vdo each thirc hinh thdnh hon hap cua dgngca chdy cuang birc vd ddc tinh cua logi nhiin lieu sir

dung di tinh todn sa bg ty so tdng dp cdn thiet khi dgng ca su dung nhien lieu LPG di ddm bdo tinh

ndng ky thudt duy tri nhu doi v&i truang hcrp sir dung xdng. Nghien cim mo phong dug'c thuc Men

tren phdn mim A VL-Boost di ddnh gid tinh ky thugt cua dgng ca khi tdng dp, vcri cdc ty so tdng dp

khdc nhau. Ket qud nghien cuu mo phong cho thdy, khi chuyin doi dgng ca xdng sang nhiin liiu_

khi, cong sudt vd mdmen cua dgng ca gidm khodng 20%, do dnh hu&ng cua hiin tugng chiem cho

cua nhiin lieu khi, tir do ldm gidm lugng hon hgp ngp vdo dgng ca. Tuy nhien, v&i viec tdng lugng

moi chdt ngp m&i bdng mdy nen tang dp, tinh ndng ky thugt cua dgng ca dd dugc cdi thien ddng ke.

V&i ty so tdng dp 1,2 thi cong sudt cua dgng ca su dung nhien lieu khi sau khi tdng dp cdi thiin vd

duy tri nhu tru&ng hap su dung nhien lieu xdng truyen thong.

Tu Ithoa: Khi thiin nhien; Khi hoa long; Tdng dp dgng ca.

ABSTRACT

This paper presents a simulation study for determination pressure ratio in motorbike engine

fueled with liquefied petroleum gas converted from currently used gasoline engine in Viet Nam In

this study, a solutionfor improving the performance characteristics ofthe engine fueled with LPG is

increasing the air and fuel mixture into cyclinderfor improvement of brake power by supercharging

According to mixti^reformation mechanism of spark ignition engine and properties of fuels, a theory

calculation of pressure ratio was conducted for maintane performance characteristic ofthe engine.

Simulation study is conducted by A VL Boost software to evaluate the performance characteristics

ofthe engine with different pressure ratio values. The results show that when the engine fueled with

liquefied petroleum gas, the brake power decreases about 20% incomparison to that of gasoline

because ofthe occupation of liquefied petroleum gas in intake manifold that make the reducement in

mass of charged mixture into the engine. However, the increasement of mass of charged mixture by

supercharging, performance characteristics ofthe engine improve considerably By supercharging

with pressure ratio up to 1.2, the brake power of engine fueled with LPG improves and mantane as

fueled with conventional gasoline.

Keywords: Natural gas, liquefied petroleum gas, supercharging.

ISSN 0866 - 7056

TAP CHf CO KHf VlfiT NAM, Sd 6 nam 2017

www.rnkhiviptnam.vn