Valvetrain Control Arrangement

摘要

A valvetrain control arrangement for an internal combustion engine. A fluid-working machine ( 1 ) has working chambers ( 3 ) of cyclically varying volume, each connected to a piston actuator ( 4 ) which is capable of moving an intake or exhaust valve in the internal combustion engine. The engine crankshaft ( 2 ) drives a crankshaft of the fluid-working machine at the same speed as the engine. Each working chamber ( 3 ) is linked to a low-pressure manifold ( 7 ) by a venting valve ( 6 ), the venting valve being normally open but electromagnetically closable by a signal from an electronic sequencing means ( 8 ) which operates in timed relationship to the engine crankshaft phase.