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US 12,018,623 B2Granted
Cam phasing control for thermal management
AssigneeCummins Inc.
InventorsAnant Puri, Gregory M. Shaver, Jeremy D. Crismore
Life of this patent
Estimating the term…
Abstract
An internal combustion engine system includes an engine with a plurality of pistons housed in respective ones of a plurality of cylinders, an air intake system to provide air to the plurality of cylinders through respective ones of a plurality of intake valves, an exhaust system to release exhaust gas from the plurality of cylinders through respective one of a plurality of exhaust valves, an aftertreatment system to treat exhaust emission from the engine, and a controller coupled to at least one sensor and configured to control a cam phaser for thermal management of the aftertreatment system.
Claims20
A method, comprising:
- operating an internal combustion engine system including an internal combustion engine with a plurality of cylinders that receive a charge flow from an intake system, the internal combustion engine system further including an exhaust system with at least one aftertreatment device for receiving exhaust gas produced by combustion of a fuel provided to at least a portion of the plurality of cylinders from a fueling system;
- in response to a thermal management condition associated with the at least one aftertreatment device, determining a phase angle change for a cam shaft that controls an exhaust valve opening and/or an exhaust valve closing of one or more of the plurality of cylinders to adjust a thermal output of the engine, wherein the phase angle change is based on a feedforward cam phase reference value determined from a lookup table or a model, a feedback cam phase reference value based on a temperature error for the at least one aftertreatment device, and one or more limits applied to an output determined from the feedforward cam phase reference value and the feedback cam phase reference value;
- and
- changing a phase angle of the cam shaft based on the phase angle change.
1 more element
An internal combustion engine system, comprising:
- an internal combustion engine including a plurality of cylinders that receive a charge flow from an intake system, an exhaust system with an aftertreatment device configured to receive exhaust gas produced by combustion of a fuel provided to at least a portion of the plurality of cylinders from a fueling system;
- a plurality of sensors operable to provide signals indicating operating conditions of the internal combustion engine system;
- a cam phaser to control an opening and/or closing timing of exhaust valves associated with the plurality of cylinders;
- and
- a controller connected to the plurality of sensors operable to interpret one or more signals from the plurality of sensors, wherein the controller, in response to a thermal management condition of the aftertreatment device based on the one or more signals, is configured to change a phase angle of the cam phaser at a given engine speed to change a timing of at least one of an exhaust valve opening and an exhaust valve closing of one or more of the plurality of cylinders, wherein the controller is configured to determine the change in phase angle for the cam phaser based on a feedforward cam phase reference value determined from a lookup table or model, a feedback cam phase reference value based on a temperature error for the aftertreatment device, and one or more limits applied to an output determined from the feedforward cam phase reference value and the feedback cam phase reference value.
2 more elements
An apparatus for thermal management of an aftertreatment device, comprising:
- a controller for connection to a plurality of sensors configured to interpret signals from the plurality of sensors associated with operation of an internal combustion engine, wherein the controller is configured to provide a cam phaser position command to vary a thermal output of the internal combustion engine at a given engine speed that changes a phase angle of a cam phaser to modulate a timing of an exhaust valve opening and an exhaust valve closing during an exhaust stroke of the internal combustion engine in response to a thermal management condition of the aftertreatment device that is based on one or more signals from one or more of the plurality of sensors, wherein the controller is configured to determine the cam phaser position command for the change in phase angle for the cam phaser in response to a feedforward cam phase reference value determined from a lookup table or a model, a feedback cam phase reference value based on a temperature error for the aftertreatment device, and one or more limits applied to an output determined from the feedforward cam phase reference value and the feedback cam phase reference value.
Dependencies are inferred from the claim text.