摘要 |
A valve control system for an internal combustion engine, the engine having at least one cylinder (4) with at least one intake or exhaust valve (12, 14) and a piston (2) and the valve being operable independently of the rotation of the engine crankshaft. The system is configured to generate a control signal that controls a preconditioning actuation cycle of an actuator (30, 32) prior to a first combustion cycle of the engine, receive a feedback signal (52, 54) relating to an operating condition of the actuator during the preconditioning actuation cycle, and generate a modified control signal (44, 46) that controls a combustion actuation cycle of the actuator, modified with reference to the feedback signal. This recalibration of the valve control signals allows the current operating conditions of the valve train to be taken into account before the first combustion cycle of the engine. |