Research On Working Equipment Potential Energy Recovery System Of Hydraulic Excavators

To improve fuel economy as well as environmental performance of 23t traditional excavators, a scheme of boom potential energy recovery was proposed, considered energy saving technology as an important field of mechanical engineering research. The main design parameters of working equipment potential energy recovery were analyzed, and the virtual prototyping and the mathematic models of hydraulic components were established. Based on the approach that flow distribution is derived from the outlet differential pressure between main power source and auxiliary, an applicable control strategy of the hydraulic excavator was employed to satisfy the load power requirements, which took into concern of the recovery and reuse of working equipment potential energy. The simulation results manifested that the raise of energy utilization ratio was noticeable, while the operating and power performances were preserved. What's more, the importance and a good prospect of the system were reflected. The paper was divided into the following sections:(1) The research background and significance of the potential energy recovery system in hydraulic excavators were introduced. And based on the present study, the content and key points of this paper were drawed.(2) Comparatively analyzed the energy savings and economics among different options, the system was determined and designed, meanwhile, system components were selected and matched to full play the performance and improve the efficiency.(3) Based on the comprehensive constant-power and negative-flow control performance, the mathematic models of working devices and hydraulic components were built, which laid a good foundation for the further study of control strategy.(4) According to the key control parameters, an applicable control strategy of the hydraulic excavator was employed to optimize the energy efficiency, approaching that flow distribution is derived from the outlet differential pressure between main power source and auxiliary. The simulation results manifested that the raise of energy utilization ratio was noticeable, while the operating and dynamic performances were preserved, which verify the feasibility of the control strategy. (5) The hydraulic system of test bench was designed, meanwhile, the system function, working principle, structure and layout were described, providing a good foundation for the (?)ther study.