Electromechanical Actuator Position Control for Reciprocating Compressor Valves

The patent applies periodic action by dividing the solenoid energization into distinct phases: initial energization to overcome spring force and start movement, followed by current reduction near the contact point to decelerate the armature. This phased periodic control enables the armature to reach the contact point with appropriate speed, avoiding excessive contact speed while maintaining reasonable transition time.

The patent implements dynamics by continuously adjusting the solenoid current based on the armature's position and velocity. The control system monitors the armature's movement and dynamically modifies the electromagnetic force to achieve optimal positioning. This dynamic control allows the system to adapt to changing conditions during the actuation process, ensuring stable contact without excessive impact.

The patent applies preliminary action by pre-positioning the armature near the contact point using moderate solenoid current before the final approach. This preliminary positioning reduces the distance over which high precision control is needed, allowing the system to achieve accurate positioning with lower overall power consumption. The armature is guided into the vicinity of the contact point first, then gently guided into final position.

The patent implements parameter changes by dynamically adjusting the solenoid current magnitude and timing based on the armature's position. The control system modifies electrical parameters (current level, pulse duration) to optimize the balance between positioning precision and power consumption. By changing current parameters adaptively, the system achieves precise positioning without maintaining high power consumption throughout the entire actuation cycle.

The patent applies beforehand cushioning by using the solenoid electromagnetic force as a damping mechanism before physical contact occurs. As the armature approaches the contact point, the solenoid current is adjusted to create an opposing electromagnetic force that cushions the approach. This pre-cushioning prevents high-impact contact while maintaining fast response, as the electromagnetic field provides gentle deceleration before mechanical contact.

The patent implements feedback by monitoring the armature's position and velocity during approach and using this information to adjust the solenoid current in real-time. The control system receives feedback about the armature's state and modifies the electromagnetic force accordingly to optimize the approach speed and contact stability. This closed-loop feedback ensures that the armature approaches at the optimal speed for both rapid response and stable contact.