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A Fundamental Study of Air-Fuel Ratio Control on LPG Liquid Injection Engines  

Sim, Han-Seop (Graduate School of Hanyang University)
Sunwoo, Myoungho (Dept.of Mechanical Engineering, Hanyang Unviersity)
Song, Chang-Seop (Dept.of Mechanical Engineering, Hanyang Unviersity)
Publication Information
Journal of the Korean Society for Precision Engineering / v.19, no.7, 2002 , pp. 80-87 More about this Journal
Abstract
Liquefied petroleum gas (LPG) is used in spark ignition (SI) engines. Fuel injection rate of an injector is affected by fuel temperature and pressure in LPG liquid injection systems for either a multi-point-injection (MPI) or a direct injection (DI) engine. Even fuel injection conditions are varied, the air-fuel ratio should be accurately controlled to reduce exhaust emissions. In this study, a correction factor fur the fuel injection rate of an injector is derived from density ratio and pressure difference ratio. A compensation method of injected fuel amount is proposed for a fuel injection control system. The experimental results for the LPG liquid injection system in a SI engine show that this system works well fur a full range of engine speed and load condition, and the air-fuel ratio is accurately controlled by the proposed correction factor.
Keywords
Liquefied petroleum gas; Liquid injection system; Fuel Injection control; Air-fuel ratio control; Correction factor;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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