Research On Vacuum Booster Input-Output Force Characteristic Curve Of AMESim

Vacuum booster is the key actuator of automobile hydraulic servo braking system.Its function is to enlarge the pedal force of driver when braking in a certain proportion,so that the braking control of automobile is more portable and reliable.Input-output force characteristic curve is the main technical index in the development and design of vacuum booster.In the process of human-vehicle interaction,sensory adjustment of brake pedal,ergonomic evaluation,braking performance and reliability are closely related to the characteristic curve of vacuum booster.Therefore,in the development of automobile brake system,it is particularly important to analyze and study its characteristic curve.The focus of this research is to analyze the working principle,characteristic curve and its influencing factors of the vacuum booster,and to develop the model of the design characteristic curve analysis system.Firstly,the working principle and dynamic characteristics of vacuum booster are studied,and the important influencing factors of characteristic curve parameters are obtained.Secondly,the solid structure is abstracted,and the model elements satisfying the requirements of structural parameters are selected from AMESim component library to construct a system-level one-dimensional simulation model,in which the non-linear characteristics of mechanical dynamics,hydrodynamics and reaction disk are fully considered.Thirdly,the structure correctness and data accuracy of the simulation model are verified by comparing the measured data of the bench of the benchmark assembly parts.Finally,combining the simulation model theory with the actual product design and development,introducing the vacuum tank assembly and the vacuum booster assembly in the current new energy electric vehicle,introducing the design parameters of the vacuum tank and booster into the simulation model of the system,obtaining the remaining braking force reserve of the vacuum tank after continuous operation,correlating the volume parameters with the characteristic curve,and giving the parameter variation theoretically.The trend and the range of design reference value prove the importance and practical value of simulation model in product forward development and design.Through the research in this paper,a trend change of product characteristic curve of positive design method is provided for the development and design of vacuum booster products and related systems,which provides design reference and theoretical basis for researchers engaged in vacuum booster technology,and facilitates system parameterization and platform design in the early stage of product development.