Valve control to reduce modal frequencies that may cause vibration
First Claim
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1. 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.
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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.
219 Citations
19 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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:
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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. - View Dependent Claims (8, 9, 10)
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11. 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:
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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. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for controlling electromechanically actuated valves in an internal combustion engine, the method comprising:
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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. - View Dependent Claims (18)
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19. 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:
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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.
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Specification