Experimental Validation of a Cogging-Torque-Assisted Valve Actuation System for Internal Combustion Engines

Electromechanical valve actuation (EVA) is an emerging technology that aims to optimize valve trains, allowing for significant improvements to engine performance, efficiency, and emissions. Recently, a simulation study introduced a novel cogging-torque-assisted motor-driven (CTAMD) valve actuation system. The actuator design emphasized a large output cogging torque that removed the need for conventional valve springs. The cogging torque developed by this actuator allows for highly efficient energy recovery that is superior to comparable systems that make use of mechanical springs. This paper experimentally validates the simulation study with a prototype actuator constructed using the specifications suggested in the previous simulation. The characterization procedure of the prototype is discussed and close agreement is found between the simulated and experimental motor parameters. Furthermore, this paper details a control system that minimizes Ohmic loss while providing fast transition times and low seating velocities. Finally, experimental results are displayed and compared to the simulated results as well as other EVA systems to validate the conjectured speed and efficiency of the CTAMD system.