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A nonlinear model to analyze the beh...

He, Chuan.

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A nonlinear model to analyze the behaviors of the idle speed and the liquid fuel film in gasoline engines.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	A nonlinear model to analyze the behaviors of the idle speed and the liquid fuel film in gasoline engines./
Author:	He, Chuan.
Description:	161 p.
Notes:	Adviser: Nabil G. Chalhoub.
Contained By:	Dissertation Abstracts International57-12B.
Subject:	Engineering, Automotive. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9715847
ISBN:	0591237881

A nonlinear model to analyze the behaviors of the idle speed and the liquid fuel film in gasoline engines.
He, Chuan.

A nonlinear model to analyze the behaviors of the idle speed and the liquid fuel film in gasoline engines. - 161 p.

Adviser: Nabil G. Chalhoub.

Thesis (Ph.D.)--Wayne State University, 1996.

Recent demands for maximum fuel economy, better driveability and minimum exhaust emissions, have placed stringent conditions under which a gasoline engine can operate during idling or transient conditions. To address this problem, a physics based nonlinear model for a four-stroke, multi-point with sequential fueling gasoline engine is developed in this study. The formulation has been structured in such a manner so that the model can be used to simulate the performance of four, six, eight or twelve-cylinder engines.

ISBN: 0591237881Subjects--Topical Terms:

1018477
Engineering, Automotive.

A nonlinear model to analyze the behaviors of the idle speed and the liquid fuel film in gasoline engines.
LDR:03679nam 2200313 a 45 001 929606
005 20110427
008 110427s1996 eng d
020 $a 0591237881
035 $a (UnM)AAI9715847
035 $a AAI9715847
040 $a UnM $c UnM
100 1 $a He, Chuan. $3 1253093
245 1 0 $a A nonlinear model to analyze the behaviors of the idle speed and the liquid fuel film in gasoline engines.
300 $a 161 p.
500 $a Adviser: Nabil G. Chalhoub.
500 $a Source: Dissertation Abstracts International, Volume: 57-12, Section: B, page: 7692.
502 $a Thesis (Ph.D.)--Wayne State University, 1996.
520 $a Recent demands for maximum fuel economy, better driveability and minimum exhaust emissions, have placed stringent conditions under which a gasoline engine can operate during idling or transient conditions. To address this problem, a physics based nonlinear model for a four-stroke, multi-point with sequential fueling gasoline engine is developed in this study. The formulation has been structured in such a manner so that the model can be used to simulate the performance of four, six, eight or twelve-cylinder engines.
520 $a The engine model takes into consideration the throttle body dynamics, the flow and thermodynamic properties of both intake and exhaust manifolds, the mass flow rates across the intake and exhaust valves, the in-cylinder process, the mixture composition in all the engine components and the rigid body motion of the piston-connecting rod crankshaft mechanism.
520 $a The nonlinear engine model is used as a test bed to examine, over a wide range of operating conditions and load disturbances, the influences on the idle speed by the time delay in the speed-density fuel strategy, the pre-mixed engine charge, the air-to-fuel ratio, the intake manifold volume and the engine inertia. The digital simulation results have shown that both the time delay in the fueling strategy and the AFR are capable of inducing sustained oscillations in the engine idle speed. Whereas, the increase in the intake manifold volume or the decrease in the engine inertia can result in a deteriorated transient response of the engine at idle.
520 $a Furthermore, the fuel transport characteristics within the induction system have been examined under transient engine operating conditions, the rationale has come up with a fuel puddle model that can be incorporated in an open-loop transient fuel compensation scheme whose main objective is to reduce the large AFR excursions observed during transient operations of port fuel injection engines. The dynamic behavior of the liquid fuel film is predicted herein by a simple first order model. The recursive least squares method is implemented to identify and constantly update the fuel model parameters as the engine operation conditions vary with time. This approach is shown, in digital simulation to be capable of starting from arbitrary values of the fuel model parameters and quickly converging to the actual values to be capable of starting from arbitrary values of the fuel model parameters and quickly converging to the numerical values that lead to the best fit between the measured and predicted time rates of change of the fuel puddle mass. This feature enables the proposed approach to be directly carried over from one engine to another with the least amount of modifications.
590 $a School code: 0254.
650 4 $a Engineering, Automotive. $3 1018477
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0540
690 $a 0548
710 2 0 $a Wayne State University. $3 975058
773 0 $t Dissertation Abstracts International $g 57-12B.
790 $a 0254
790 1 0 $a Chalhoub, Nabil G., $e advisor
791 $a Ph.D.
792 $a 1996
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9715847