Abstract
This paper addresses the cylinder-to-cylinder air-fuel ratio (A/F) balancing
control problem. First, the dynamics of A/F propagation in the exhaust runners and the
gas mixing manifold is analyzed under some reasonable assumptions, and by combination
with fuel path dynamics, an estimation-oriented dynamical model is established to provide
the individual cylinder A/F with a single sensor. Then, an estimation method, which
is established on the model, is provided based on multiplex sampling data of the single
sensor. Furthermore, experimental results with a feedback controller, which consists of the
estimator and conventional PI control law, will be shown to demonstrate the effectiveness
of the proposed methods.
Keywords: Engine control, Air fuel ratio, Individual cylinder control