Engine Isolation Control via Magnetorheological Technology

Abstract

The mount with variable damping and stifsfnes characteristics is very important for engine active isolation in whole frequency region. Based on building one engine isolation dynamic model with three degree of freedom, a magnetorheological (MR) parallel-mount system is proposed, which includes one MR damper with variable damping and one MR elastomer with variable stiffness. To decrease vertical force and cross moment transmitted from engine to base, a fuzzy adaptive controller is designed for vertical isolation, which can online adjust quantization factors and scale factor by human-simulation intelligent parameter modifying algorithm. And coordination control strategies are given to adjust damping and stiffness of each MR parallel-mount. Then the simulation isolation system of engine is developed in Matlab and the test-bed isolation system of engine is built in the laboratory. With wide frequency input, studies on different engine mount isolation are carried out. Simulation results indicate that MR parallel-mount has distinct advantages compared to other mounts. Laboratory results show that compared to rubber mount and hydraulic mount, MR fluid mount reduces absolute transfer coefficient of force and moment to less than 30 percents in a broader frequency region, which is very useful to enhance the ride comfort.