Efficient phaser actuation supply system

摘要

A hydraulic cam phaser includes at least one of an advance chamber and a retard chamber for receiving hydraulic fluid for advancing or retarding a rotational position of the camshaft. The hydraulic actuation system includes a hydraulic accumulator in selective communication with the at least one of the advance and retard chambers of the hydraulic cam phaser. A first system oil pump provides lubrication oil to the valvetrain system, and the hydraulic actuation system includes a second oil pump for supplying oil to the hydraulic accumulator. The second oil pump is controlled with a clutch device connecting the second oil pump to the engine drive system. The internal combustion engine includes a controller which controls actuation of the clutch device to actuate the clutch device during deceleration of the vehicle.

主权项

1. An internal combustion engine for a vehicle, comprising:
an engine block defining a plurality of cylinders: a cylinder head mounted to the engine block and defining intake ports and exhaust ports in communication with the cylinders; a valvetrain system including a plurality of intake valves disposed within the intake ports and a plurality of exhaust valves disposed within the exhaust ports; a camshaft operable to open at least one of the plurality of intake valves and the plurality of exhaust valves; a hydraulic cam phaser including at least one of an advance chamber and a retard chamber for receiving hydraulic fluid for advancing or retarding a rotational position of the camshaft; a hydraulic actuation system including a hydraulic accumulator in selective communication with the at least one of the advance and retard chambers of the hydraulic cam phaser; and a first system oil pump for providing lubrication oil to engine bearings and the valvetrain system, said hydraulic actuation system including a second oil pump for supplying oil to said hydraulic accumulator, wherein the second oil pump is selectively controlled with a clutch device connecting said second oil pump to the engine drive system, said internal combustion engine includes a controller which controls actuation of the clutch device to actuate the clutch device during deceleration of the vehicle.