Cylinder mass air flow prediction model
AssigneeGeneral Motors Corporation
InventorsKenneth P. Dudek, Layne K. Wiggins
Life of this patent
Estimating the term…
Abstract
A vehicle system includes a throttle position sensor that generates a current throttle position signal (TPS), a MAF sensor that generates a current actual MAF signal, and a manifold absolute pressure (MAP) sensor that generates a current actual MAP signal. A controller determines a current estimated cylinder air flow (CAF) signal, determines a MAF transient signal and determines a MAP transient signal. The controller determines a predicted CAF signal into the engine based on the current estimated CAF signal, the current actual MAF signal, the current MAP signal, a current TPS signal, the MAF transient signal and the MAP transient signal.
Claims37
A vehicle system to predict cylinder air flow (CAF) into engine cylinders, comprising:
- a throttle position sensor that generates a current throttle position signal (TPS);
- a mass air flow (MAF) sensor that generates a current actual MAF signal;
- a manifold absolute pressure (MAP) sensor that generates a current actual MAP signal;
- and
- a controller that determines a current estimated CAF signal, determines an MAF transient signal, determines a MAP transient signal, and determines a predicted CAF signal into said engine based on said current estimated CAF signal, said current actual MAF signal, said current MAP signal, said current TPS signal, said MAF transient signal, and said MAP transient signal.
A method of operating an engine based on predicted cylinder air flow (CAF), comprising:
- determining a current estimated CAF signal into said engine based on a prior predicted CAF signal;
- calculating a mass air flow (MAF) transient signal based on a pre-defined MAF gain limit;
- calculating a manifold absolute pressure (MAP) transient signal based on a pre-defined MAP gain limit;
- generating a current predicted CAF signal into said engine based on said current estimated CAF signal, said MAF transient signal, and said MAP transient signal;
- and
- operating said engine based on said current estimated CAF signal and said current predicted CAF signal.
A method of predicting cylinder air flow (CAF) into engine cylinders, comprising:
- determining a current estimated CAF signal into said engine;
- generating a current actual mass air flow (MAF) signal into said engine;
- generating a current actual manifold absolute pressure (MAP) signal of said engine;
- sending a current throttle position (TPS) signal;
- calculating an MAF transient signal based on a pre-defined MAF gain limit;
- calculating an MAP transient signal based on a pre-defined MAP gain limit;
- and
- determining a predicted CAF signal into said engine based on said current estimated CAF signal, said current actual MAF signal, said current MAP signal, said current TPS signal, said MAF transient signal, and said MAP transient signal.
Dependencies are inferred from the claim text.