Transitions among operating modes in an engine with a hybrid valvetrain
AssigneeFord Global Technologies, LLC
InventorsWilliam Francis Stockhausen, Mazen Hammoud, Thomas George Leone, Diana Dawn Brehob, John D. Russell
Life of this patent
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Abstract
A method for controlling intake valves in an internal combustion with intake valves operated by more than one type of actuation device includes steps to accomplish smooth transitions among intake valve operating modes.
Claims24
A method for controlling an internal combustion engine, the engine having at least one cylinder, at least one randomly operable intake valve, at least one selectable intake valve with a predetermined valve closing time, a throttle valve disposed in an air intake system of said engine and an engine control unit, said method comprising the steps of:
- providing a closing time of the randomly operable intake valve which is after the predetermined valve closing time;
- and
- initiating operation of the selectable intake valve in response to said providing step.
A method for controlling an internal combustion engine, the engine having at least one cylinder, at least one randomly operable intake valve, at least one selectable intake valve with a predetermined closing time, a throttle valve disposed in an intake system of said engine, and an engine control unit, said method comprising the steps of:
- activating the randomly operable intake valve with a closing time after the predetermined valve closing time;
- and
- opening the throttle valve and retarding said closing time of the randomly operable intake valve.
A method for controlling an internal combustion engine, the engine having at least one cylinder, at least one randomly operable intake valve, at least one selectable intake valve, a throttle valve disposed in an air intake system of said engine, and an engine control unit, said method comprising the steps of:
- advancing a closing time of the randomly operable intake valve and closing the throttle valve;
- and
- ceasing operation of the randomly operable intake valve when additional advancement of said valve closing time of the randomly operable intake valve has no appreciable effect on inducted air remaining in the cylinder after closing of the randomly operable intake valve.
Dependencies are inferred from the claim text.