Self-learning torque over boost combustion control
AssigneeCummins Inc.
InventorsOmkar A. Harshe, Ming-Feng Hsieh
Life of this patent
Estimating the term…
Abstract
A spark ignited internal combustion engine is controlled in response to a self-learned TOB reference. The self-learned TOB reference is based on a difference between a learned TOB offset and a desired or target TOB, and a sensed TOB. The learned TOB offset at a given operating condition, such as charge pressure, can be found by interpolating between the learned charge pressure breakpoints in a TOB learning algorithm. The TOB learning algorithm can include using a filtered charge pressure value to indicate the engine load at which the TOB is learned. An index determination is made with a look up table with charge pressure as an input and an array index of learned charge pressure and learned TOB offset as outputs.
Claims20
A method, comprising:
- determining a pressure in a charge flow to at least one of a plurality of cylinders of an internal combustion engine system;
- determining a torque over boost (TOB) error associated with the pressure in the charge flow;
- learning a TOB offset and a charge pressure at the associated pressure in the charge flow;
- determining an updated TOB error in response to the learned TOB offset, a desired TOB, and a sensed TOB;
- and
- adjusting an operating condition of the at least one engine in response to the updated TOB error.
A system, comprising:
- an internal combustion engine including a plurality of cylinders and at least one engine sensor;
- an exhaust system configured to receive exhaust from the plurality of cylinders;
- an intake system configured to direct a charge flow to the plurality of cylinders;
- a fuel system including at least one fuel source operable to provide a flow of fuel to the plurality of cylinders;
- and
- a controller connected to the internal combustion engine and the at least one engine sensor, wherein the controller is configured to:
- receive a pressure signal indicative of the charge flow pressure and determine a torque over boost (TOB) error associated with the charge flow pressure;
- learn a TOB offset and learn a charge pressure at the associated charge flow pressure;
- determine an updated TOB error in response to the learned TOB offset, a desired TOB, and a sensed TOB;
- and
- adjust an operating condition of the internal combustion engine in response to the updated TOB error.
An apparatus, comprising:
- an electronic controller operable to:
- determine a pressure in a charge flow to at least one of a plurality of cylinders of an internal combustion engine system;
- determine a torque over boost (TOB) error associated with the pressure in the charge flow;
- learn a TOB offset and a charge pressure at the associated pressure in the charge flow;
- determine an updated TOB error in response to the learned TOB offset, a desired TOB, and a sensed TOB;
- and
- adjust an operating condition of the at least one engine in response to the updated TOB error.
Dependencies are inferred from the claim text.