Valve control for an engine with electromechanically actuated valves
AssigneeFord Global Technologies, LLC
InventorsDonald J. Lewis, John O. Michelini, Nate Trask, Gang Song
Life of this patent
Estimating the term…
Abstract
A system and method to control engine valve timing of an internal combustion engine. Electromechanical valves are controlled to improve engine fuel economy. Further, the method can adjust valve operation to provide air-fuel charge motion and increase combustion stability.
Claims41
A computer readable storage medium having stored data representing instructions executable by a computer to control an internal combustion engine of a vehicle, said storage medium comprising:
- instructions for opening a first electrically actuated exhaust valve at a position different from the opening position of a second exhaust valve, relative to engine crankshaft position, during a combustion cycle of said cylinder during a first operating condition;
- and
- instructions for opening said first electrically actuated exhaust valve and said second exhaust valve at a common opening position relative to engine crankshaft position during a combustion cycle of said cylinder during a second operating condition.
A method for controlling a first electrically actuated exhaust valve and a second exhaust valve of a cylinder in a multi-cylinder internal combustion engine, the method comprising:
- during a combustion cycle of said cylinder during a first operating condition, opening said first electrically actuated exhaust valve at a position different from the opening position of said second exhaust valve, relative to engine crankshaft position;
- during a combustion cycle of said cylinder during a second operating condition, opening said first electrically actuated exhaust valve and said second exhaust valve at a common opening position relative to engine crankshaft position.
A method for controlling a first electrically actuated intake valve and a second intake valve, a first electrically actuated exhaust vale and a second exhaust valve, of a cylinder in a multi-cylinder internal combustion engine, the method comprising:
- during a combustion cycle of said cylinder, opening said first electrically actuated intake valve at a position different from the opening position of said second intake valve, relative to engine crankshaft position, and opening said first electrically actuated exhaust valve at a position different from the opening position of said second exhaust valve, relative to engine crankshaft position;
- and
- operating said first electrically actuated intake valve, said second intake valve, said first electrically actuated exhaust valve, and said second exhaust valve while said cylinder is operating in a multi-stroke mode.
A method for controlling a first electrically actuated intake valve and a second intake valve, a first electrically actuated exhaust valve and a second exhaust valve, of a cylinder in a multi-cylinder internal combustion engine, the method comprising:
- during a cycle of said cylinder, opening said first electrically actuated intake valve at a position different from the opening position of said second intake valve, relative to engine crankshaft position, and opening said first electrically actuated exhaust valve at a position different from the opening position of said second exhaust valve, relative to engine crankshaft position.
A method for controlling a first electrically actuated exhaust valve and a second exhaust valve of a cylinder in a multi-cylinder internal combustion engine, the method comprising:
- determining an operating condition of said internal combustion engine during starting;
- and
- during a cycle of said cylinder, opening said first electrically operated exhaust valve at a position different from the opening position of said second exhaust valve, relative to engine crankshaft position, wherein said opening of said first electrically operated exhaust valve is varied as at least said basedensaid engine starting operating condition varies.
Dependencies are inferred from the claim text.