Simulation and Optimization Research of the Actuator for Soft-Close Automatic Car Doors

Abstract

Based on the current design of actuator for soft-close automatic car doors, function and composition of the mechanical assembly and the electronic control module of the actuator are elaborated firstly. Then the push travel section of cam profile is optimized from previous circular arcs to a spline curve to reduce impact and fatigue wear between the switch and the cam in the mechanical assembly through multi-body dynamics simulation with the Adams solving tool in NX7.5. Besides, an improvement of the MOSFET bridge drive circuit and corresponding program design through dead-time control method with half-bridge chopper are applied to solve the heating problem in the electronic control module, in the light of equivalent electronic circuit simulation in Multisim. The results demonstrate that the optimization works well, and valuable conclusions can be drawn from system simulation during the prototype stage of the actuator product is practicable.