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Research On Swing Braking Energy Recovering System Of Hydraulic Excavator

Posted on:2013-01-01Degree:MasterType:Thesis
Country:ChinaCandidate:X XuFull Text:PDF
GTID:2212330371460627Subject:Mechanical design and theory
Abstract/Summary:PDF Full Text Request
Utilizing hydraulic accumulator based assistant energy recovery system is the key research program in the engineering machinery at home and abroad, which could achieve energy recycle and reuse during hydraulic excavator swing stage. Once the excavator starts to swing, it contains three continue phases as follows:start-up acceleration, constant speed, and braking deceleration. And partial energy could be recycled in braking deceleration phase. The technical difficulties are listed below:switch conditions of entering and exiting braking deceleration phase, energy release control in hydraulic accumulator in start-up acceleration phase.The swing braking energy recovery research is based on the traditional 23-ton excavator platform. No impacts on the platform layout stability and less change to the original system layout as premises, an automatic hydraulic-controlled braking energy recovery system was proposed which can automatically identify the swing stage by the pressure difference between inlet and outlet of the swing pump and determining distribution algorithm of the recovering energy. The state of pressure(SOP) of the accumulator, the outlet pressure of the hydraulic pump and the feedback pressure from negative-flow control were considered as inputs. According to the real-time required power of the swing hydraulic system, the energy distribution algorithm along with one normal school function were proposed based on the comprehensive constant-power negative-flow control. It distributes energy ratio between the main power source and the auxiliary power source (that is engine and accumulator). And it ensures the normal operation of the swing mechanism. To gain better system efficiency and more suitable parameter settings in the controller, the genetic optimization algorithm was utilized to optimize the system energy distribution parameters globally. Results show that the hydraulic excavator equipped with the swing recovery system can achieve more than 21% energy saving compared with the baseline under the same working condition, and the overall chain efficiency from the total braking energy to the terminal swing mechanism is as much as 50.0% approximately while the swing is utilized as the actuator alone.
Keywords/Search Tags:hydraulic excavator, hybrid power, swing regenerative braking, energy recovery, stability
PDF Full Text Request
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