Patent ID: 7959164

Claim:
A roll control device comprising: at least first and second actuators that each have first and second chambers, and each of the first and second actuators having a first inlet port to the first chamber and a second inlet port to the second chamber; at least one pump including at least a first outlet port fluidly connected to the first inlet port to the first chamber and a second outlet port fluidly connected to the second inlet port to the second chamber, and wherein the first outlet port is fluidly connected to a first valve and the second outlet port fluid connected to a second valve, the first and second valves being fluidly connected to a reservoir; at least one failsafe valve downstream of the pump and upstream of the actuator; at least first and second pressure relief valves associated with the first and second outlet ports of the pump and associated with the first and second inlet ports of the first actuator, and wherein the first and second pressure relief valves are positioned downstream of the failsafe valve and upstream of the first actuator; at least third and fourth pressure relief valves associated with the first and second outlet ports of the pump and associated with the first and second chambers of the second actuator; at least a first cross-link valve that fluidly connects the first and second chambers of the first actuator and a second cross-link valve that fluidly connects the first and second chambers of the second actuator; at least one motor connected to the pump; and a controller configured to command the motor to drive the pump and to control the failsafe and the first and second cross-link valves to transfer fluid between the first and second chambers of the first actuator and between the first and second chambers of the second actuator to change differential roll force associated with at least one of the first and second chambers to achieve a desired roll stability condition.