Patent ID: 7565896
Filing Date: 2009-07-28
Classification: F02D

Abstract:
1. A method of transitioning between positive power operation and engine braking operation in an internal combustion engine cylinder, said method comprising the steps of: actuating intake and exhaust valves associated with the engine cylinder in a manner that permits the engine cylinder to generate positive power; determining a desire to transition the engine cylinder from generating positive power to providing engine braking; actuating the intake and exhaust valves associated with the engine cylinder in a manner that permits the engine cylinder to transition from generating positive power to providing engine braking in response to the determination of the desire to transition from generating positive power to providing engine braking; determining that the engine cylinder is providing engine braking; and actuating the intake and exhaust valves associated with the engine cylinder in a manner that permits the engine cylinder to provide a desired level of engine braking in response to the determination that the engine cylinder is providing engine braking, wherein the manner in which the intake and exhaust valves are actuated for the transition from generating positive power to providing engine braking differs from the manner in which the intake and exhaust valves are actuated for generating positive power and providing engine braking.