Exhaust gas recirculation control in an internal combustion engine
AssigneesTula Technology, Inc., Cummins Inc.
InventorsXin Yuan, Shikui Kevin Chen, Jennifer K. Light-Holets, Scott R. Bardakjy
Life of this patent
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Abstract
A system and method of integrating an engine having dynamic skip fire control with an exhaust gas recirculation system in a turbocharged internal combustion engine is described. An engine control system determines an appropriate firing pattern based at least in part on a desired exhaust gas recirculation flow rate. Signals from sensors in the intake manifold and exhaust system may also be used as part of a feedback loop to determine a desired exhaust gas recirculation flow rate.
Claims20
A method of selecting cylinders to deactivate in an internal combustion engine, the engine having an intake manifold and an exhaust system, comprising:
- determining a desired exhaust gas recirculation flow rate;
- determining a position of an exhaust gas recirculation valve;
- deactivating selected cylinders based at least in part on the desired exhaust gas recirculation flow rate and the position of the exhaust gas recirculation valve;
- and
- determining an engine speed;
- determining a boost pressure in the intake manifold;
- and
- regulating a maximum exhaust gas recirculation rate based at least in part on the engine speed and the boost pressure.
An internal combustion engine, the engine having an intake manifold, an exhaust gas recirculation system, and an exhaust system having at least two exhaust manifolds, the engine comprising:
- an exhaust gas recirculation feed line connected to the exhaust system, wherein the exhaust gas circulation feed line has a more direct fluid connection to a first exhaust manifold than to a second exhaust manifold;
- and
- an engine control system configured to:
- deactivate at least one cylinder based at least in part on a desired exhaust gas recirculation flow rate;
- determine an engine speed;
- determine a boost pressure in the intake manifold;
- and
- regulate a maximum exhaust gas recirculation rate based at least in part on the engine speed and the boost pressure.
An internal combustion engine, the engine having an intake manifold, an exhaust gas recirculation system, and an exhaust system having at least two exhaust manifolds, comprising:
- an exhaust gas recirculation feed line connected to the exhaust system, wherein the exhaust gas circulation feed line has a more direct fluid connection to a first exhaust manifold than to a second exhaust manifold;
- and
- an engine control system for selecting cylinders to deactivate based at least in part on a desired exhaust gas recirculation flow rate, wherein the engine control system uses a first control algorithm to select a first set of cylinders to deactivate for cylinders that vent into the first exhaust manifold and a second control algorithm to select a second set of cylinders to deactivate for cylinders that vent into the second exhaust manifold.
Dependencies are inferred from the claim text.