Internal combustion engine pneumatic state estimator
AssigneesGeneral Motors Corporation, Delco Electronics Corporation
InventorsPeter M. Olin, Peter J. Maloney
Life of this patent
Estimating the term…
Abstract
Pneumatic state estimation operations for estimating gas flow and pressure at pneumatic nodes and flow branches within a reticulated engine system for engine control and diagnostic operations resolves net flow imbalances at specific pneumatic nodes and attributes such imbalances to inaccuracies in pneumatic state estimation. Inaccuracies are corrected as a function of a prior pneumatic state estimate and of a net flow imbalance at the node or a neighboring node for precision engine control and diagnostic operations.
Claims11
A method for estimating pneumatic states including a gas pressure state within an internal combustion engine system having a plurality of gas flow branches, comprising the steps of:
- defining a pneumatic node within an engine system through which gasses flow along at least two gas flow branches;
- estimating gas flow along the at least two gas flow branches;
- combining the estimated gas flows to form a net flow of gasses at the defined pneumatic node;
- and
- estimating gas pressure at a predetermined pneumatic node within the engine system as a predetermined function of the net flow of gasses.
A method for estimating gas pressure in an internal combustion engine system represented as a network of pneumatic nodes having gas flow paths therebetween, comprising the steps of:
- estimating gas pressure at at least two of the pneumatic nodes;
- selecting a pneumatic node of the engine system through which gasses flow along at least two corresponding gas flow paths;
- estimating gas flow through the corresponding gas flow paths;
- calculating net gas flow at the selected pneumatic node as a function of the estimated gas flow through the corresponding gas flow paths;
- generating an estimated pressure at a predetermined pneumatic node as a function of the calculated net gas flow.
Dependencies are inferred from the claim text.