System for controlling a variable valve actuation system

A valve actuation system for an engine, comprising:

• 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;
• an intake cam assembly connected to the intake valve to move the intake valve between the first position and the second position;
• an exhaust valve moveable between a first position where the exhaust valve prevents a flow of fluid and a second position where the exhaust valve allows a flow of fluid;
• an exhaust cam assembly connected to the exhaust valve to move the exhaust valve between the first position and the second position;
• a brake actuator adapted to operatively engage the exhaust valve and to move the exhaust valve from the first position towards the second position;
• a valve actuator adapted to operatively engage the intake valve and to prevent the intake valve from returning to the first position;
• a sensor operable to sense an operating parameter of the engine;
• and
• a controller operable to determine a 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.

An engine, comprising:

• an engine block defining at least one cylinder;
• a piston slidably disposed within the at least one cylinder to reciprocate between a bottom-dead-center position and a top-dead-center position;
• 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;
• an intake cam assembly connected to the intake valve to move the intake valve between the first position and the second position;
• an exhaust valve moveable between a first position where the exhaust valve prevents a flow of fluid and a second position where the exhaust valve allows a flow of fluid;
• an exhaust cam assembly connected to the exhaust valve to move the exhaust valve between the first position and the second position;
• a brake actuator adapted to operatively engage the exhaust valve and to move the exhaust valve from the first position towards the second position when the piston is approaching the top-dead-center position in a compression stroke;
• a valve actuator adapted to operatively engage the intake valve and to prevent the intake valve from returning to the first position;
• a sensor operable to sense an operating parameter of the engine;
• and
• a controller operable to determine a 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.