This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Cylinder To Cylinder AFR Control With An Asymmetrical Exhaust Manifold in a GDI System
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 23, 1998 by SAE International in United States
Annotation ability available
In this work we have developed an algorithm to estimate and control the air fuel ratio of each cylinder from the measurement of an UEGO sensor placed at the confluence point in the exhaust manifold.
In our case of study the exhaust manifold was very asymmetric.
We have developed a simple model of this exhaust manifold capable of satisfying the control objectives.
The lambda value for each cylinder is predicted from the actual lambda value measured at the confluence point by 4 different static Kalman filters depending on the cylinder that has finished its exhaust phase.
The lambda feedback uses the output of the Kalman filters to control the AFR for each cylinder.
The algorithm has been implemented on a production SAGEM ECU and the experimental tests have been made on a PSA 1.8 liter 4 cylinder engine
The experimental results show that the algorithm is able to correct the cylinder to cylinder AFR with an accuracy around 3% for a fueling variation of 30%.
This strategy is therefore useful mainly in the case of direct injection for very lean and stratified combustion, or in classical MPI systems.
CitationCarnevale, C. and Hadji, M., "Cylinder To Cylinder AFR Control With An Asymmetrical Exhaust Manifold in a GDI System," SAE Technical Paper 981064, 1998, https://doi.org/10.4271/981064.
- HASEGAWA Y. “Individual Cylinder Air Fuel Ratio Feedback Control Using an Observer” SAE Paper 940376
- GRIZZLE J.W. “Individual Cylinder Air Fuel Ratio Control with a Single EGO Sensor”
- WATANABE A. “A single-chip RISC Microcontroller Boarding on MY1998” SAE Paper 970863
- ANDERSON M. J. “A Feedback A/F Control System for Low Emission Vehicles” SAE Paper 930388
- HOSP W. SCHURZ W. “Potential for single-cylinder lambda control by means of rapid” Siemens AG Automobiltechnik
- ATHANS Michael “Frequency Domain Properties Of Kalman Filters” March 14 1986 MCS II, MIT