气路闭环空气悬架系统能量损耗建模及分析

Modeling and Analysis of Energy Consumption for Air Suspension System with Closed-loop Air Circuit

研究了高低压腔气路闭环空气悬架系统充放气过程中的能耗问题。基于热力学和车辆动力学理论建立了气路闭环空气悬架充放气模型并在Simulink中仿真,通过1/2车对空气弹簧进行充放气实验,实验结果验证了所建立的充放气模型的正确性。为分析研究闭环系统能量损耗途径,采用压缩气体有效能(即压缩气体对外界大气所做的功)对系统充气、放气、升压三个过程的能量损耗进行量化计算。仿真结果表明:充气过程中能耗随高压腔压力升高而变大;放气与升压过程中的能耗都随低压腔压力升高而降低;在同等条件下,高低压腔气路闭环系统相对开环系统可以节约大量的能量。

The energy consumption during charging and discharging processes of a closed-loop air suspension system with high and low pressure chambers was studied herein.Based on the thermodynamics theory and vehicle dynamics,the charging and discharging models of the closed-loop air suspension system were developed and simulated in the Simulink environment.The simulation model was validated by the charging and discharging experiments of the air springs on the half-vehicle system.In order to study the ways of energy loss of the closed-loop system,the compressed gas effective energy which means the work made by the compressed gas to the external atmosphere was adopted and quantitative calculations were completed during the processes of charging,discharging and boosting.The simulation results indicate that during the charging process the energy consumption increases along with the rising of the pressure in the high pressure chamber.However,energy consumption in both of discharging and boosting processes reduces along with rising of the pressure in the low pressure chamber.More energy can be saved by using closed-loop system with high and low pressure chambers comparing to the open-loop system under same circumstances.