Air dynamic steady state and transient detection method for cam phaser movement
AssigneeGM Global Technology Operations LLC
InventorsLayne K. Wiggins, Gregory P. Matthews
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Abstract
An air dynamic steady state detection system for movement of a cam phaser of an internal combustion engine includes a cam position sensing device and a control module. The cam position sensing device generates a position signal based on a position of the cam phaser of the engine. The control module receives the position signal and applies first and second filters to the position signal to select either a transient or steady state condition. The control module also calculates an estimated air value based on the selection of the transient or steady state condition.
Claims19
An air dynamic steady state detection system for movement of a cam phaser of an internal combustion engine, comprising:
- a cam position sensing device that generates a position signal based on a position of said cam phaser of said engine;
- and
- a control module that receives said position signal and that applies first and second filters to said position signal to select one of a transient condition and a steady state condition, and wherein said control module calculates an estimated air value based on said selection of said transient condition and said steady state condition.
An air dynamic steady state detection method for cam phaser movement, comprising:
- receiving a cam phaser position signal;
- applying a first filter to said cam phaser position signal;
- applying a second filter to said cam phaser position signal;
- calculating a difference between an output of said first filter and an output of said second filter;
- selecting a steady state condition when an absolute value of said difference is less than a predetermined value;
- selecting a transient condition when said absolute value of said difference is greater than or equal to said predetermined value;
- and
- selecting a method for calculating an estimated air value based on said steady state condition and said transient condition.
An air dynamic steady state detection system, comprising:
- a first cam position sensing device that generates an intake position signal based on a position of a first cam phaser associated with an intake camshaft;
- a second cam position sensing device that generates an exhaust position signal based on a position of a second cam phaser associated with an exhaust camshaft;
- a state determination module that selects one of a transient condition and a steady state condition of said intake camshaft and said exhaust camshaft;
- and
- an air estimation module that calculates an estimated air value based on said transient condition and said steady state condition of said intake camshaft and said exhaust camshaft.
Dependencies are inferred from the claim text.