Boom Cylinder Dig Flow Regeneration

摘要

A hydraulic system and methods for conserving energy in such system is disclosed. The hydraulic system includes a hydraulic actuator having a head end, a rod end and a piston disposed therebetween. The system also includes a pump that pumps fluid to the actuator, a first valve disposed downstream of the rod end, and a second valve disposed between the pump and the head end of the actuator. When the system is in a load overrunning condition, the second valve is partially closed to restrict the flow of a combined fluid. The combined fluid including fluid received from the pump and fluid received from the rod end of the actuator. When the system is in the light resistive load condition, the second valve is open to allow the combined fluid to flow through the second valve.

主权项

1. A method for conserving energy in a hydraulic system including:
a pump, a hydraulic actuator including a head end, a rod end, and a piston disposed inside the actuator between head end and the rod end, a first valve disposed between the rod end and a fluid reservoir, and disposed between the rod end and a second valve, and the second valve disposed between the pump and the head end, the method comprising: determining when the hydraulic system is in an overrunning load condition, a light-resistive load condition or a heavy-resistive load condition; and when the hydraulic system enters the overrunning load condition, receiving by the head end regenerated fluid.