Patent ID: 8191518
Filing Date: 2012-06-05
Classification: F01L

Abstract:
1. A valvetrain control arrangement comprising a fluid-working machine having at least one working chamber of cyclically varying volume and a low pressure manifold, the or each working chamber being connected to a piston actuator which is capable of moving an intake or exhaust valve in an internal combustion engine; said fluid-working machine having a crankshaft driven by the engine, the or each working chamber being linked to the low-pressure manifold by a venting valve, the venting valve being electromagnetically operable by a signal from an electronic sequencing element which operates in timed relationship to the phase of the engine crankshaft, wherein the engine has a speed and the said crankshaft of the fluid-working machine has a speed and the said speed of the engine and the said speed of the crankshaft of the fluid-working machine are the same.