Control system and method for variable valve actuation system
First Claim
1. A method of controlling a variable valve actuation system for an engine, comprising:
- operating a cam assembly to move an intake valve between a first position where the intake valve blocks a flow of fluid and a second position where the intake valve allows a flow of fluid, the cam assembly being adapted to move the intake valve to the first position at a predetermined timing;
sensing at least one operating parameter of the engine;
determining a desired valve actuation period based on the at least one operating parameter;
engaging a valve actuator operatively with the intake valve to prevent the intake valve from returning to the first position at the predetermined timing in response to operation of the cam assembly; and
releasing the valve actuator to allow the intake valve to return to the first position after the predetermined timing and at the end of the determined valve actuation period.
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Accused Products
Abstract
A method of controlling a variable valve actuation system is provided. A cam assembly is operated to move an intake valve between a first position where the intake valve blocks a flow of fluid and a second position where the intake valve allows a flow of fluid. At least one operating parameter of the engine is sensed. A valve actuation period is determined based on the at least one operating parameter. A valve actuator is engaged with the intake valve to prevent the intake valve from returning to the first position in response to operation of the cam assembly. The valve actuator is released to allow the intake valve to return to the first position at the end of the determined valve actuation period.
53 Citations
36 Claims
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1. A method of controlling a variable valve actuation system for an engine, comprising:
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operating a cam assembly to move an intake valve between a first position where the intake valve blocks a flow of fluid and a second position where the intake valve allows a flow of fluid, the cam assembly being adapted to move the intake valve to the first position at a predetermined timing;
sensing at least one operating parameter of the engine;
determining a desired valve actuation period based on the at least one operating parameter;
engaging a valve actuator operatively with the intake valve to prevent the intake valve from returning to the first position at the predetermined timing in response to operation of the cam assembly; and
releasing the valve actuator to allow the intake valve to return to the first position after the predetermined timing and at the end of the determined valve actuation period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An intake valve actuation system for an engine, comprising:
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an intake valve moveable between a first position where the intake valve prevents a flow of fluid and a second position where the intake valve allows a flow of fluid;
a cam assembly connected to the intake valve to move the intake valve between the first position and the second position, the cam assembly adapted to move the intake valve to the first position at a predetermined timing;
a valve actuator configured to selectively engage the intake valve and prevent the intake valve from returning to the first position at the predetermined timing;
a sensor operable to sense an operating parameter of the engine; and
a controller operable to determine a desired valve actuation period based on the sensed operating parameter of the engine and to actuate the valve actuator to prevent the intake valve from returning to the first position for the determined desired valve actuation period after the predetermined timing and to release the valve actuator to allow the intake valve to return to the first position after the predetermined timing and at the end of the determined desired valve actuation period. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. An engine, comprising:
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an engine block defining at least one cylinder;
a piston slidably disposed within the at least one cylinder;
an intake valve moveable between a first position where the intake valve prevents a flow of fluid to the at least one cylinder and a second position where the intake valve allows a flow of fluid to the at least one cylinder;
a cam assembly connected to the intake valve to move the intake valve between the first position and the second position, the cam assembly adapted to move the intake valve to the first position at a predetermined timing;
a valve actuator configured to selectively engage the intake valve and prevent the intake valve from returning to the first position until after the predetermined timing;
a sensor operable to sense an operating parameter of the engine; and
a controller operable to determine a desired valve actuation period based on the sensed operating parameter of the engine and to actuate the valve actuator to prevent the intake valve from returning to the first position for the determined valve actuation period after the predetermined timing and to release the valve actuator to allow the intake valve to return to the first position after the predetermined timing and at the end of the determined desired valve actuation period. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of controlling a variable valve actuation system for an engine, comprising:
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operating a cam assembly to move an intake valve between a first position where the intake valve blocks a flow of fluid and a second position where the intake valve allows a flow of fluid, the cam assembly being adapted to move the intake valve to the first position at a predetermined timing;
sensing at least one operating parameter of the engine;
determining a desired valve actuation period based on the at least one operating parameter;
identifying a limitation on the desired valve actuation period based on the at least one operating parameter;
modifying the desired valve actuation period based on the identified limitation;
engaging a valve actuator operatively with the intake valve to prevent the intake valve from returning to the first position at the predetermined timing in response to operation of the cam assembly; and
releasing the valve actuator to allow the intake valve to return to the first position at the end of the modified desired valve actuation period and after the predetermined timing. - View Dependent Claims (32, 33, 34, 35, 36)
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Specification