Publications:Robust tuning of Individual Cylinders AFR in SI Engines with the Ion Current

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Title Robust tuning of Individual Cylinders AFR in SI Engines with the Ion Current
Author Nicholas Wickström and Stefan Byttner and Ulf Holmberg
Year 2005
PublicationType Journal Paper
Journal SAE Transactions
HostPublication
Conference SAE World Congress & exhibition 2005
DOI http://dx.doi.org/10.4271/2005-01-0020
Diva url http://hh.diva-portal.org/smash/record.jsf?searchId=1&pid=diva2:404648
Abstract A method for robust tuning of individual cylinders air-fuel ratio is proposed. The fuel injection is adjusted so that each cylinder has the same air-fuel ratio in inner control loops, and the resulting air-fuel ratio in the exhaust pipe is controlled with an exhaust gas oxygen sensor (EGO) in an outer control loop to achieve stoichiometric air-fuel ratio. Correction factors to provide cylinder individual fuel injection timing are calculated based on measurements of the ion currents for the individual cylinders. An implementation in a production vehicle is shown with results from driving on the highway.