Design Analysis And Fuzzy Control Of A Large-Scale Coach Powertrain Mounting System

Vehicle powertrain is the main exciting source of vibration, which has a significant impact on the stability and comfort of vehicle operations. There is little powertrain mounting system study for arge passenger vehicles , the current bus engine is mainly passive rubber mounting system, which is difficult to meet the range of the engine vibration noise broadband requirements. This paper presents new MRF hydraulic suspension system. the adjustable damping is achieved by the use of fuzzy control ,which has has a guiding sense for descreasing Noise level of vehicle vibration .The six degrees of freedom dynamic model of the system is established,Based on a domestic passenger car structure and characteristics of the powertrain . The model directly reflects the four-point bus, oblique powertrain mounting system.the system of differential equations of motion is derived in accordance with four-cylinder four-stroke inline engine system as the external excitation source . the current use of the passive rubber engine mounting system can not meet the requirements of broadband noise isolation. Compare and analyze that the current passive rubber engine mounting system can't meet the requirements of the engine isolating vibration and noise.The new engine MRF hydraulic mounting is designed,which meets Requirement of Broadband vibration isolation . the hydraulic oil fluid is replaced by MRF in The passive hydraulic mounting, which can achieve real-time damping control.Analyze the specific structure,working principle, the components of the materials, design dimensions and parameters.we also analyze the hydraulic of powertrain mounting system , six-step mode natural frequency, steady state vibration response and special conditions of the transient vibration response.Finally, the fuzzy control theory is fused in the hydraulic powertrain mounting system, according to broadband engine vibration isolation requirements, fuzzy control strategy and fuzzy controller are designed.The paper compared the fuzzy control of the magnetorheological hydraulic suspension and uncontrolled magnetorheological hydraulic suspension and rubber mounts for vibration.Verify that the magnetorheological hydraulic mount with the fuzzy control has an improvement over the passive mounting system. Its damp can be controlled as real-time, and it can be effective in isolation within the broadband.