Valve control to reduce modal frequencies that may cause vibration
AssigneeFord Global Technologies, LLC
InventorsJohn O. Michelini, Donald J. Lewis
Life of this patent
Estimating the term…
Abstract
A method to reduce chassis vibration in an engine with valves that may be deactivated. Valves are controlled to avoid exciting modal frequencies of mechanical components and systems.
Claims19
A method for controlling at least a valve that may be deactivated to operate in at least a cylinder of an internal combustion engine, the method comprising:
- operating at least a cylinder in said internal combustion engine;
- adjusting the number of valves that operate in a cycle of said cylinder based at least on an operating condition of at least a vehicle chassis system;
- and
- adjusting a damping ratio of at least an engine mount in response to operation of said valve.
A method for controlling at least an electromechanically actuated valve to operate in at least a cylinder of an internal combustion engine, the method comprising:
- determining a modal frequency of a vehicle chassis system;
- evaluating whether to operate said electromechanical actuated valve in said cylinder based on said modal frequency;
- operating said electromechanically actuated valve during a cycle of said cylinder based on said evaluation.
A method for controlling at least an electromechanically actuated valve to operate in at least a cylinder of an internal combustion engine, the method comprising:
- determining an operating condition of a vehicle mechanical component;
- evaluating whether to operate said electromechanical actuated valve in said cylinder based on said operating condition;
- operating said selected electromechanically actuated valve during a cycle of said cylinder based on said evaluation;
- and
- adjusting a damping ratio of at least an engine mount in response to operation of said electromechanically actuated valve.
A method for controlling electromechanically actuated valves in an internal combustion engine, the method comprising:
- determining a modal frequency of a vehicle chassis system;
- evaluating whether to activate a cylinder based on said modal frequency;
- activating said cylinder during a cycle of said cylinder based on said evaluation.
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 operating at least a cylinder in said internal combustion engine with a first number of valves active during a cycle of said cylinder at least during a first vehicle chassis system condition;
- and
- instructions for operating at least a cylinder in said internal combustion engine with a second number of valves active during a cycle of said cylinder at least during a second vehicle chassis system condition, with said first number different from said second number, and said first vehicle chassis system condition different from said second vehicle chassis condition;
- and
- instructions for adjusting a damping ratio of at least an engine mount in response to said operation of said electromechanically actuated valves.
Dependencies are inferred from the claim text.