ZHANG Fu jun, ZHAO Chang lu, HUANG Ying, HAO Li jun. Study on a Closed-Loop Air-Fuel Control System of Gasoline Engines by Simulation[J]. JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2003, 12(3): 296-301.
Citation:
ZHANG Fu jun, ZHAO Chang lu, HUANG Ying, HAO Li jun. Study on a Closed-Loop Air-Fuel Control System of Gasoline Engines by Simulation[J].JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2003, 12(3): 296-301.
ZHANG Fu jun, ZHAO Chang lu, HUANG Ying, HAO Li jun. Study on a Closed-Loop Air-Fuel Control System of Gasoline Engines by Simulation[J]. JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2003, 12(3): 296-301.
Citation:
ZHANG Fu jun, ZHAO Chang lu, HUANG Ying, HAO Li jun. Study on a Closed-Loop Air-Fuel Control System of Gasoline Engines by Simulation[J].JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2003, 12(3): 296-301.
In order to study the factors that influence the air fuel ratio(A/F), the amplitude and frequency of A/F fluctuation, to reform the control strategy, and to improve the efficiency of three way catalyst(TWC), a model of closed loop control system including the engine, air fuel mixing and transportation, oxygen sensor and controller, etc., is developed. Various factors that influence the A/F control are studied by simulation. The simulation results show that the reference voltage of oxygen sensor will influence the mean value of A/F ratio, the controller parameters will influence the amplitude of A/F fluctuation, and the operating conditions of the engine determine the frequency of A/F fluctuations, the amplitude of A/F fluctuation can be reduced to within demanded values by logical selection of the signal acquisition method and controller parameters. Higher A/F fluctuation frequency under high speed and load can be reduced through software delay in the controller. The A/F closed loop control system based on the simulation results, accompanied with a rare earth element TWC, gives a better efficiency of conversion against harmful emissions.
T ay lor C F.T he internal combustion eng ine in theoryand pr actice,Vo l.1,2nd ed[M].Cambridge:T he M ITPress,1965.
[2]
F leming W J.Zir conia ox ygen sensor An equivalent circuit model[R].SA E 800020,1980.
[3]
O rder C H,Roduner C A,Geer ing H P.M odel identification for the A/F path of an SI engine[R].SAE970612,1997.
[4]
Ishii Junichi,A mano M atsuo,Y amauchi T eruo,et al.Wide r ange air fuel ratio control system[R].SAE880134,1988.
[5]
Hambur g D R,Cook J A,K aiser W J,et al.An enginedynamometer study of t he A/F compatibility between at hree way catalyst and an ex haust gas ox ygen sensor[R].SAE 830986,1983.