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US 11,306,668 B1Granted
Methods and systems for engine valve timing or lift adjustment
AssigneeFord Global Technologies, LLC
InventorsBrien Fulton, Michiel J. Van Nieuwstadt, Chris Glugla
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for controlling and monitoring intake and exhaust poppet valves of an internal combustion engine. In one example, the methods and system include feedback control that estimates intake and exhaust valve timing based on output of an in cylinder pressure sensor. In another example, the methods and system include compensation for feedforward control of intake and exhaust valves based on output of the in cylinder pressure sensor.
Claims20
A method for operating an engine, comprising:
- via a controller, estimating intake valve opening timing and estimating exhaust valve opening timing of a cylinder from an output of a pressure sensor in the cylinder, where estimating intake valve opening timing and estimating exhaust valve opening timing includes generating a polytropic cylinder pressure via a polytropic cylinder pressure model and comparing the polytropic cylinder pressure to the output of the pressure sensor;
- adjusting a feedforward intake valve opening timing via a feedforward intake valve offset, the feedforward intake valve offset based on the estimated intake valve opening timing;
- and
- adjusting opening of an intake valve according to the adjusted feedforward intake valve opening timing.
1 more element
An engine system, comprising:
- an engine including a cylinder;
- a pressure sensor positioned in the cylinder;
- a first valve position sensor to monitor opening and closing of a poppet valve of the cylinder;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to correct an intake valve opening timing generated from a valve position sensor via an intake valve opening timing generated from a pressure output of a pressure sensor and a polytropic cylinder pressure.
2 more elements
A method for operating an engine, comprising:
- via a controller, estimating intake valve opening timing and estimating exhaust valve opening timing of a cylinder from output of a pressure sensor in the cylinder and a polytropic cylinder pressure;
- generating an intake valve timing error via subtracting the estimated intake valve opening timing from a target intake valve opening timing;
- generating an exhaust valve timing error via subtracting the estimated exhaust valve opening timing from a target exhaust valve opening timing;
- and
- adjusting the target intake valve opening timing in response to a state of an intake valve opening timing monitor.
2 more elements
Dependencies are inferred from the claim text.