Solenoid diagnostic systems for cylinder deactivation control
AssigneeGM Global Technology Operations LLC
InventorsKenneth J. Cinpinski, Joseph R. Dulzo
Life of this patent
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Abstract
A solenoid diagnostic system includes a pressure monitoring module that determines a first pressure in an intake cam phaser for an intake camshaft and a second pressure in an exhaust cam phaser for an exhaust camshaft associated with a cylinder. A fuel injection monitoring module determines a fuel injection status associated with the cylinder. A fault determination module diagnoses a fault in a solenoid associated with the cylinder based on the first pressure, the second pressure, and the fuel injection status.
Claims22
A solenoid diagnostic system comprising:
- a pressure monitoring module that determines a first pressure in an intake cam phaser for an intake camshaft and a second pressure in an exhaust cam phaser for an exhaust camshaft associated with a cylinder;
- a fuel injection monitoring module that determines a fuel injection status associated with the cylinder;
- and
- a fault determination module that diagnoses a fault in a solenoid associated with the cylinder based on the first pressure, the second pressure, and the fuel injection status,
- wherein the fault determination module diagnoses the fault when the first pressure is below a first threshold based on a pressure in the intake cam phaser when an intake valve is opened and the second pressure is below a second threshold based on a pressure in the exhaust cam phaser when an exhaust valve is opened, and wherein diagnosis occurs in response to timing of a fuel injection event.
A solenoid diagnostic system comprising:
- a pressure monitoring module that determines a first pressure in an intake cam phaser for an intake camshaft and a second pressure in an exhaust cam phaser for an exhaust camshaft associated with a cylinder;
- a fuel injection monitoring module that determines a fuel injection status associated with the cylinder;
- and
- a fault determination module that diagnoses a fault in a solenoid associated with the cylinder based on the first pressure, the second pressure, and the fuel injection status, wherein the first pressure is based on an average of pressure values in the intake cam phaser over N engine revolutions, where N is an integer greater than one.
A solenoid diagnostic system comprising:
- a pressure monitoring module that determines a first pressure in an intake cam phaser for an intake camshaft and a second pressure in an exhaust cam phaser for an exhaust camshaft associated with a cylinder;
- a fuel injection monitoring module that determines a fuel injection status associated with the cylinder;
- and
- a fault determination module that diagnoses a fault in a solenoid associated with the cylinder based on the first pressure, the second pressure, and the fuel injection status, wherein the second pressure is based on an average of pressure values in the exhaust cam phaser over N engine revolutions, where N is an integer greater than one.
A method of diagnosing a solenoid associated with a cylinder for cylinder deactivation control comprising:
- determining a first pressure in an intake cam phaser for an intake camshaft associated with the cylinder;
- determining a second pressure in an exhaust cam phaser for an exhaust camshaft associated with the cylinder;
- determining a fuel injection status of the cylinder associated with the cylinder;
- and
- diagnosing a fault in the solenoid when the first pressure is below a first threshold based on a pressure in the intake cam phaser when an intake valve is opened and the second pressure is below a second threshold based on a pressure in the exhaust cam phaser when an exhaust valve is opened, wherein the diagnosing occurs in response to timing of a fuel injection event.
A method of diagnosing a solenoid associated with a cylinder for cylinder deactivation control comprising:
- determining a first pressure in an intake cam phaser for an intake camshaft associated with the cylinder;
- determining a second pressure in an exhaust cam phaser for an exhaust camshaft associated with the cylinder;
- determining a fuel injection status of the cylinder associated with the cylinder;
- diagnosing a fault in the solenoid based on the first pressure, the second pressure, and the fuel injection status;
- and
- averaging pressure values in the intake cam phaser over N engine revolutions associated with the cylinder to determine the first pressure, where N is an integer greater than one.
A method of diagnosing a solenoid associated with a cylinder for cylinder deactivation control comprising:
- determining a first pressure in an intake cam phaser for an intake camshaft associated with the cylinder;
- determining a second pressure in an exhaust cam phaser for an exhaust camshaft associated with the cylinder;
- determining a fuel injection status of the cylinder associated with the cylinder;
- diagnosing a fault in the solenoid based on the first pressure, the second pressure, and the fuel injection status;
- and
- averaging pressure values in the exhaust cam phaser over N engine revolutions associated with the cylinder to determine the second pressure, where N is an integer greater than one.
Dependencies are inferred from the claim text.