A New Formulation of Multi-Zone Combustion Engine Models
Cylinder pressure simulation has grown to become an important tool
when developing and evaluating new engine concepts and control
strategies. A new formulation of zero-dimensional multi-zone models
is developed and described. A general model structure is formulated
that rely on a set of differential algebraic equations that are easy
to solve. The selected formulation also results in models that are
easy to scale, i.e. add new zones, and to increase complexity, which
is a result of the selected
structure. A number of important issues that can cause problems when
simulating the model are treated. It is shown: a) How a new zone is
initialized. b) How variables of varying magnitude can be scaled to
avoid numerical difficulties. c) How numerical errors accumulated
during the simulation can be reduced by using a set of consistency
equations.
Ylva Nilsson and Lars Eriksson
IFAC Workshop: Advances in Automotive Control,
2001
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