Active Suspension With Electromagnetic Linear Actuator Energy Storage Device Research

Vehicle is a major consumer of fossil fuels and has a serious impact on the global energy issues.Traditional automobile suspension can convert vibration energy into thermal energy and dissipate into the air through the damper,while electromagnetic active suspensions can regenerate these energies into useful electrical energy.Therefore,the aim of this reserach is to investigate,design and develop an active suspensions using electromagnetic linear actuator(EMLA).A new type of moving-magnet type ELMA is developed according to the technical indexes of active suspension used in FSEC Racing Car.According to the feature of greatly variation of motor’s terminal voltage,induced electromotive force and armature current in motor mode and generator mode,the overall scheme of energy storage device and its composition were designed;the energy-regenerative mode was selected as the research focus.Thus,four models were built,which were central energy storage system consisted of accumulator and super capacitor,DC/DC power conversion system model equipped with buck and boost,H-Bridge model with rectifying and inverting functions and 1/4 electromagnetic active suspension model.Meanwhile,co-simulation between Maxwell and Simplorer is adopted to model the 1/4 electromagnetic active suspension and analyze the power generation characteristic of the EMLA under different excitations,which provides foundation for the circuit design.In order to maximize the energy recovery range and improve the efficiency of energy-regenerative,a technique used for energy flow control based on voltage classification is devised.Moreover,fuzzy PI algorithm was used to control the DC/DC power converter buck-boost process.Finally,we developed a prototype encompassed of energy-regenerative circuit and 1/4 electromagnetic active suspension,and designed the hardware and software for its energy storage device using DSP TMS320F2812.Consequently,energy-regenerative test for the circuit and ethe electromagnetic active suspensions respectively were employed to evaluate power generation characteristic of the EMLA,and the efficiency and applicability of overall design and control strategy of the energy storage device.