The Structure Design And Control Study Of Vehicle Magneto-rheological Mount

Vehicle NVH problems caused by the engine have become increasingly prominent in the trends of automobile lightweight and high-power engine. The transmission of engine vibration to vehicle body must be effectively restrained in order to improve vehicle ride comfort. At the same time, the vibration transmission to the engine which is caused by road excitation need to be isolated in order to protect the engine. Therefore, the research of novel high-performance mount is necessary.A novel flow mode MR(magneto-rheological) engine mount is designed in this paper which combines to the use of the rheological characteristics of MR fluid. The direct and inverse model of MR mount is established based on the experimental results of MR mount. A 10-Dof full- vehicle dynamics model is established considering the road input excitation. PID control strategy, fuzzy control strategy and FxLMS algorithm are respectively designed for engine vibration isolation, which provide theoretical and technical support for the control of MR mount and have important theoretical significance and engineering value. The main contents of this paper include:① According to the ideal dynamic characteristics of the engine mount system, a MR engine mount with controllable damping channel is designed. Its operating principle is demonstrated, and the main structural parameters of MR mount are determined.② Processing and assembly the designed MR mount and test its static and dynamic performance to verify the rationality of structure design.③ Taking advantage of neural network’s nonlinear approximation ability, MR engine mount’s generalized regression neural network(GRNN) model and inverse model are established base on dynamic experimental data. Which provide a model base to the control of MR mount.④ Analysis the stress condition of the crank and rod mechanism of four cylinder four stroke engine. For the complex characteristics of engine working environment, a 10-Dof full- vehicle dynamics model is established considering the road input excitation. And analysis the inherent characteristics and coupling characteristics of vehicle vibration, which laid the foundation for the verification of control algorithm based on full- vehicle model.⑤ PID control strategy, fuzzy control strategy and FxLMS algorithm are respectively designed based on the full- vehicle model. The control results are simulated and analyzed in Simulink, which show that PID control, fuzzy control and FxLMS algorithm can attenuate engine vibration in a certain extent.