Method and apparatus for controlling an internal combustion engine
AssigneeGM Global Technology Operations LLC
InventorsJim Liu, Yongsheng He
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Abstract
An internal combustion engine is described, and includes a method for operating that includes determining an observed carbon monoxide (CO) ratio in an exhaust gas feedstream, determining an observed in-cylinder scavenging based upon the observed CO ratio in the exhaust gas feedstream, and controlling, by a controller, control states for the variable cam phasing system to control opening times of engine intake valves in relation to closing times of engine exhaust valves based upon the observed in-cylinder scavenging.
Claims20
A method for operating an internal combustion engine including a variable cam phasing system, the method comprising:
- determining an observed carbon monoxide (CO) ratio in an exhaust gas feedstream;
- determining an observed in-cylinder scavenging ratio based upon the magnitude of CO in the exhaust gas feedstream;
- and
- controlling, by a controller, control states for the variable cam phasing system to control opening times of engine intake valves in relation to closing times of engine exhaust valves based upon the observed in-cylinder scavenging ratio.
A method for operating an internal combustion engine including intake valves and exhaust valves having variably controllable opening and closing times, the method comprising:
- determining an amount of carbon monoxide (CO) in an exhaust gas feedstream;
- determining an observed in-cylinder scavenging ratio based upon the amount of CO in the exhaust gas feedstream;
- and
- controlling, by a controller, openings of the intake valves in relation to closings of the exhaust valves based upon the observed in-cylinder scavenging ratio and a target in-cylinder scavenging ratio.
A multi-cylinder internal combustion engine, comprising:
- an intake cam phaser and an exhaust cam phaser;
- a plurality of actuators and a plurality of sensors;
- a controller including executable routines, the routines including:
- determining an amount of carbon monoxide (CO) in an exhaust gas feedstream;
- determining an observed in-cylinder scavenging ratio based upon the amount of CO in the exhaust gas feedstream;
- and
- controlling the intake cam phaser and the exhaust cam phaser based upon the observed in-cylinder scavenging ratio and a target in-cylinder scavenging ratio.
Dependencies are inferred from the claim text.