초록 ▼

A four-stroke cycle, multi-cylinder reciprocating internal combustion engine (10) has a camshaft phaser (34) for adjusting the rotational position of the intake and exhaust camshafts (25, 26) with respect to the rotational position of the crankshaft (12) so that some of the cylinders (8) of the engi

A four-stroke cycle, multi-cylinder reciprocating internal combustion engine (10) has a camshaft phaser (34) for adjusting the rotational position of the intake and exhaust camshafts (25, 26) with respect to the rotational position of the crankshaft (12) so that some of the cylinders (8) of the engine (10) may be deactivated. A common intake plenum (38) provides intake air to each of the cylinders (8) during normal engine operation, while an exhaust system (40) receives exhaust gasses from both the deactivatable cylinders (8a) as well as the other cylinders (8b). The cam phaser (34) adjusts the camshaft positions during cylinder deactivation operation such that the deactivated cylinders (8a) pump exhaust gas through the deactivated cylinders (8a) into the common plenum (38), which is employed by the still active cylinders (8b) as EGR gas.

대표청구항 ▼

[ We claim:] [1.] A four-stroke cycle, multi-cylinder reciprocating internal combustion engine having a crankshaft and a plurality of pistons reciprocably contained within a plurality of cylinders, said engine comprising:at least one intake poppet valve and at least one exhaust poppet valve for each

[ We claim:] [1.] A four-stroke cycle, multi-cylinder reciprocating internal combustion engine having a crankshaft and a plurality of pistons reciprocably contained within a plurality of cylinders, said engine comprising:at least one intake poppet valve and at least one exhaust poppet valve for each engine cylinder;a first camshaft for operating some of the intake valves and a second camshaft for operating some of the exhaust valves, with the two camshafts mechanically linked together;a camshaft phaser coupled to at least one of the first and second camshafts for simultaneously adjusting the rotational position of the first and second camshafts with respect to the rotational position of the crankshaft;an intake manifold having a common plenum in communication with each of the intake valves;an interconnected exhaust system for receiving exhaust gases from at least some cylinders which are to remain fully active and at least some of the cylinders to be deactivated; anda controller, connected to the camshaft phaser, for deactivating at least some of the cylinders and recirculating exhaust gas from the deactivated cylinders into the common plenum by operating the camshaft phaser so that for the cylinders which are to be deactivated, the camshaft timing is adjusted such that the intake valve and the exhaust valve open and close at points which are slightly beyond approximately symmetrical about a rotational position of the crankshaft at which the direction of motion of the cylinder's piston changes.