Air/fuel control system with lost fuel compensation
AssigneeFord Motor Company
InventorsRobert M. Marzonia, Michael J. Cullen, Jon Dixon
Life of this patent
Estimating the term…
Abstract
An air/fuel control method for an internal combustion engine. A portion of fuel delivered to the engine which is lost between the piston and engine cylinder walls during predetermined engine operating conditions is calculated. Fuel delivered to the engine is then adjusted for the calculated lost fuel quantity to achieve a desired engine air/fuel ratio.
Claims14
A method for controlling an internal combustion engine having a plurality of combustion chambers coupled to an engine exhaust and thermally communicating with a coolant jacket, each of the combustion chambers including a cylinder having an inner wall with a piston positioned therein, comprising the steps of:
- delivering fuel to the engine;
- calculating a quantity of said delivered fuel which is lost between the piston and the cylinder inner wall during a predetermined engine operating condition;
- and
- adjusting said delivered fuel for said calculated lost quantity to achieve a desired engine air/fuel ratio.
A method for controlling an internal combustion engine having a plurality of combustion chambers coupled to an engine exhaust and thermally communicating with a coolant jacket, each of the combustion chambers including a cylinder having an inner wall with a piston positioned therein, comprising the steps of:
- delivering fuel to the engine;
- inferring temperature of the cylinder inner wall;
- calculating a quantity of said delivered fuel which is lost between the piston and the cylinder inner wall from said inferred inside wall temperature during a predetermined engine operating condition;
- and
- adjusting said delivered fuel for said calculated lost quantity to achieve a desired engine air/fuel ratio.
A method for controlling an internal combustion engine having a plurality of combustion chambers coupled to an engine exhaust and thermally communicating with a coolant jacket, each of the combustion chambers including a cylinder with a piston positioned therein, comprising the steps of:
- delivering fuel to the engine;
- calculating a heat transfer ratio between the combustion chambers and the coolant jacket;
- inferring temperature of the combustion chambers from at least one engine operating parameter;
- inferring inside wall temperature of the cylinders from at least said heat transfer ratio and said coolant jacket temperature and said inferred combustion chamber temperature;
- calculating a quantity of said delivered fuel which is lost between the piston and the cylinder during a predetermined engine operating condition from said inferred inside wall temperature;
- and
- adjusting said delivered fuel for said calculated lost quantity to achieve a desired engine air/fuel ratio.
Dependencies are inferred from the claim text.