Abstract
For internal combustion engines with multi-cylinders, the differences of fuel injection, air distribution, and even exhaust gas recirculation between cylinders may result in cylinder-to-cylinder im...
Highlights
For conventional multi-cylinder engines, the feedback signal from a single switching exhaust gas oxygen (EGO) sensor, which is usually located on the exhaust manifold, is sampled and averaged to adjust the fuel injection duration of each fuel injectors uniformly and to regulate the air–fuel ratio (A/F) at the stoichiometric value to improve the three-way catalytic converter’s efficiency.[1,2] It is obvious that this conventional A/F feedback control is to regulate the average A/F of all cylinders
We propose an individual A/F estimation algorithm for a large-bore six-cylinder gas fuel engine with asymmetrical exhaust runners using one universal exhaust gas oxygen (UEGO) sensor placed at each side of the exhaust manifold
The A/ F value of UEGO located on the confluence point are calculated by the engine model of GT-Power, which is transferred to the coupled individual cylinder A/F estimation models of Simulink
Summary
For conventional multi-cylinder engines, the feedback signal from a single switching exhaust gas oxygen (EGO) sensor, which is usually located on the exhaust manifold, is sampled and averaged to adjust the fuel injection duration of each fuel injectors uniformly and to regulate the air–fuel ratio (A/F) at the stoichiometric value to improve the three-way catalytic converter’s efficiency.[1,2] It is obvious that this conventional A/F feedback control is to regulate the average A/F of all cylinders. For engines with the symmetrical exhaust manifold, the individual cylinder A/F estimation and control can be realized by the Kalman filter with only one coefficient vector.[7] While for engines with the asymmetrical exhaust manifold, the exhaust gas flow from each cylinder into the exhaust manifold confluence point has a different transport lag. We propose an individual A/F estimation algorithm for a large-bore six-cylinder gas fuel engine with asymmetrical exhaust runners using one UEGO sensor placed at each side of the exhaust manifold. The symmetrical exhaust manifold can be characterized only by the vector C, containing the weighting factors c1, c2, and c3 While for this large-bore gas fuel engine with asymmetrical exhaust runners, every exhaust BDC has a different group of these weight factors c1, c2, and c3.
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