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An Engine Model of a Heavy-Duty Compressed Natural Gas Engine for Design of an Air-Fuel Ratio Controller  

심한섭 (서울산업대학교 자동차공학과)
이태연 (원주대학 동력기계과)
Publication Information
Transactions of the Korean Society of Machine Tool Engineers / v.12, no.5, 2003 , pp. 80-87 More about this Journal
Abstract
Air partial pressure ratio and inlet air mass flow are influenced by water vapor and gaseous fuel in mixture on Compressed Natural Gas (CNG) engines. In this paper, the effects of the water vapor and the gaseous fuel that change the air mass flow and the air-fuel ratio are studied. Effective air mass ratio is defined as the air mass flow divided by mixture mass flow, and also it is applied to the estimation of the inlet air mass flow and the air-fuel ratio. The presence of the gaseous fuel and the water vapor in the mixture reduces the air partial pressure and the effective air mass ratio of the CNG engines. The experimental results for the CNG engine show that estimation of the air-fuel ratio based upon the effective air mass ratio is more accurate than that of a normal mode.
Keywords
Compressed Natural Gas: CNG; Air-Fuel Ratio Controller; Effective Air Mass Ratio; Estimation of the Air-Fuel Ratio;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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