Transitions among operating modes in an engine with a hybrid valvetrain
AssigneeFord Global Technologies, LLC
InventorsThomas George Leone, Diana Dawn Brehob, John D. Russell
Life of this patent
Estimating the term…
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.
Claims20
A method for controlling an internal combustion engine, the engine having at least one cylinder, at least one randomly operable 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:
- closing the throttle valve and advancing a closing time of said randomly operable intake valve, in the event that said closing time of the randomly operable intake valve is retarded from a predetermined valve closing time;
- and
- closing the throttle valve and retarding a closing time of the randomly operable intake valve, in the event that said closing time of the randomly operable intake valve is advanced from said predetermined valve closing time.
A method for controlling an internal combustion engine, the engine having at least one cylinder, at least one randomly operable intake valve, a throttle valve disposed in an intake valve system of said engine, and an engine control unit, said method comprising the steps of:
- opening the throttle valve and advancing a closing time of the randomly operable intake valve, in the event that said closing time of the randomly operable intake valve is advanced from a predetermined valve closing time;
- and
- opening the throttle valve and retarding said closing time of the randomly operable intake valve, in the event that said closing time of the randomly operable intake is retarded from said predetermined valve closing time.
A system for controlling an internal combustion engine, the engine having at least one cylinder and a throttle valve disposed in an air intake, comprising:
- a randomly operable intake valve coupled to the cylinder;
- and
- an electronic control unit operably connected to the engine, the throttle valve, and said randomly operable intake valve, said electronic control unit commands the throttle valve to close and commands said randomly operable intake valve to close at an advanced timing when said closing time of said randomly operable intake valve is retarded from a predetermined valve closing time.
A system for controlling an internal combustion engine, the engine having at least one cylinder and a throttle valve disposed in an air intake, comprising:
- a randomly operable intake valve coupled to the cylinder;
- and
- an electronic control unit operably connected to the engine, the throttle valve, and said randomly operable intake valve, said electronic control unit commands the throttle valve to open and commands said randomly operable intake valve to close at a retarded timing when said closing time of said randomly operable intake valve is retarded from a predetermined valve closing time.
Dependencies are inferred from the claim text.