Patent ID: 8850806

Claim:
A hydraulic control system, comprising: a work tool movable through segments of an excavation cycle; a motor configured to swing the work tool during the excavation cycle; at least one accumulator configured to selectively receive fluid discharged from the motor and to discharge fluid to the motor during the excavation cycle, wherein the at least one accumulator includes a hi ressure accumulator and a low-pressure accumulator; and a controller configured to: receive input regarding a current excavation cycle of the work tool; make a determination based on the input that the current excavation cycle is associated with one of a set of known modes of operation; and cause the at least one accumulator to receive fluid and discharge fluid during different segments of the excavation cycle based on the determination, wherein during one of the set of known modes of operation, the controller causes the high-and low-pressure accumulators to simultaneously receive pressurized fluid.