ENERGY RECOVERY SYSTEM HAVING ACCUMULATOR AND VARIABLE RELIEF

摘要

A swing energy recovery system (50) for a machine (10) is disclosed. The swing energy recovery system may have a pump (58) configured to pressurize fluid, a motor (49) driven by a flow of pressurized fluid from the pump, and an energy recovery arrangement (104) configured to receive pressurized fluid discharged from the motor and selectively supply pressurized fluid to the motor. A selector valve (120), a charge valve (122), and a discharge valve (124) can be selectively used for charging and discharging at least one accumulator (108, 110). The swing energy recovery system may also have a pressure relief valve (146) associated with the motor, and a controller (100) in communication with the energy recovery arrangement and the pressure relief valve. The controller may be configured to selectively adjust a setting of the pressure relief valve based on an operating condition of the energy recovery arrangement.