Deceleration cylinder cut-off with sliding cam

An overhead camshaft system, comprising:

• an internal combustion engine of an automobile vehicle having multiple cylinders;
• multiple camshafts including an intake camshaft and an exhaust camshaft, the multiple camshafts individually having multiple sliding camshaft barrels;
• opposed ends of the camshaft barrels individually having a zero-lift lobe;
• multiple intake valves operated by the intake camshaft, wherein the multiple intake valves comprise all of the intake valves associated with the internal combustion engine;
• and
• multiple intake actuators operating during a deceleration cylinder cut-off (DCCO) mode to slidably displace the camshaft barrels of the intake camshaft to position the zero-lift lobe of the multiple sliding camshaft barrels of the intake camshaft into contact with the multiple intake valves.

A method for achieving complete cylinder deactivation using an overhead camshaft system for an engine of an automobile vehicle, comprising:

• slidably mounting camshaft barrels on multiple camshafts;
• positioning a zero-lift lobe at opposed ends of the camshaft barrels;
• connecting multiple intake valves for operation by a first one of the camshafts and multiple exhaust valves for operation by a second one of the camshafts, wherein the multiple intake valves comprise all of the intake valves associated with the engine and the multiple exhaust vales comprise all of the exhaust valves associated with the engine;
• and
• actuating multiple actuators to operate during a deceleration cylinder cut-off (DCCO) mode to slidably displace the camshaft barrels to position the zero-lift lobe of predetermined ones of the multiple sliding camshaft barrels into contact with at least one of:
• the multiple intake valves;
• or the multiple exhaust valves.