Abstract: The energy regulation device (ERD) is the key component of energy regulation based variable speed electro-hydraulic control system. And it determines the control effects. The structure of ERD is not complicated but it consists of three strongly nonlinear components: an accumulator, a proportional throttle valve and a relief valve, which increases the difficulty of analysis and design. The mathematical model of ERD is deduced firstly. The static characteristic analysis of the ERD is carried out. The transfer function of ERD is deduced by the mathematical model linearization. The effects of the accumulator volume, the precharge pressure and the proportional throttle valve on the ERD performance are analyzed in detail. The conclusion is deduced that the key problems of the ERD design are the capacity volume and the precharge pressure of the accumulator. The cylinder is taken as an example, the design principle of ERD is deduced, and some digital simulations under different volumes and precharge pressures of the accumulator are implemented. The experiments of valve control system, variable speed & valve control system and energy regulation based variable speed electro-hydraulic control system are also implemented. The results of simulations and experiments indicate that the design principle of the ERD is correct and feasible, thus laying the foundation for its practical applications.

Key words: Accumulator, Energy regulation device, Static and dynamical analysis, Variable speed electro-hydraulic system