Control of Electromagnetic Valve Actuators Working Under External Effects of Revolution

The article discuss algorithms for controlling electromagnetic actuators (EMAs) of a resonant type which are oriented at controlling the valves of units of autonomous transport systems and provide stable operation of the electromagnetic mechanism under vibration conditions. The feature of the proposed algorithms is the absence of specialized position sensors, speed or acceleration of the movable actuator element which excludes the existence of additional frictional forces in the mechanism, simplifies the design, increases the service life and reliability of EMAs in general. The algorithms are based on the interconnection of electrical processes taking place in the winding of the electromagnetic actuator with mechanical processes caused by the movement of the movable element of the magnetic system. The transient characteristic of the control signal in the coil of the electromagnet is presented, and a method for determining the duration of the time intervals and the rate of current change in real time for forming a transient characteristic of the control signal, under the condition of the minimum value of the final velocity of the valve, is considered. The efficiency of the application of the proposed control algorithms for the EMAs of the air pulse valve was tested experimentally on a test bench with an internal combustion engine. The test results showed that the application of the proposed algorithms allows to provide a final valve landing speed of less than 0.4 m/s and a switching time of about 3.6 ms under the external disturbance.