US Patent 8096227 Hydraulic system having regeneration modulation

A hydraulic system for a machine is disclosed. The hydraulic system may have an actuator with a first chamber and a second chamber. The hydraulic system may also have a first valve, a second valve, a third valve, and an operator input device displaceable from a neutral position to generate a signal indicative of a desired movement of the actuator. The hydraulic system may further have a controller configured to open the first and third valves by amounts related to the signal to pass fluid, and open the second valve by an amount related to the signal to pass fluid when the signal indicates a desire for increased actuator velocity. The third valve may continue to open during opening of the second valve.