Abstract: A vehicle roll control system, comprising a front torsion bar(22), attached to the front hydraulic actuator (34) and a rear torsion bar (24) attached to the rear hydraulic actuator (34?). A pressure control valve (99) is fluidly connected between a pressure source (80) and a reservoir (81). A directional valve (82) is fluidly connected between the pressure control valve (99) and the hydraulic actuators (34,34?). A pressure relief valve (83,84) fluidly connects the directional valve to the pressure source (80) or the reservoir (81) and is actuated to create pressure differential between first fluid chambers (58,58?) of the hydraulic actuators (34,34?)and/or to create pressure differential between second fluid chambers (60,60?) of the hydraulic actuators (34,34?).

Abstract: A vehicle roll control system, comprising a front torsion bar, a front hydraulic actuator (34) attached to the front torsion bar; a rear torsion bar, a rear hydraulic actuator (34) attached to the rear torsion bar; and control means (70-99) connected to the front and rear hydraulic actuators and controlling the operation thereof on detection of a predetermined vehicle condition; wherein each front and rear hydraulic actuator comprises a housing, a piston (62,62) making a sealing sliding fit inside the housing to define a first fluid chamber (58,58) and a second fluid chamber (60,60), and a piston rod (64,64) connected to the piston and extending through the second fluid chamber and out of the housing; wherein the control means acts on detection of the predetermined vehicle condition to apply a fluid pressure to the first fluid chamber of the front hydraulic actuator which is different from the fluid pressure applied to the first fluid chamber of the rear hydraulic actuator and/or apply a fluid pressure to the

Abstract: A vehicle roll control system for a vehicle has a hydraulic actuator attached to a torsion bar. The system includes first and second pressure control valves fluidly connected in series between a pressure source and a reservoir, and a directional valve fluidly connected between the pressure control valves and the hydraulic actuator. The control valves are actuated to control the fluid pressure within the hydraulic actuator to either extend or compress the hydraulic actuator based on the detection of a predetermined vehicle condition for controlling vehicle roll.

Abstract: A vehicle roll control system for a vehicle having a hydraulic actuator attached to a torsion bar, and means for controlling the operation thereof on detection of a predetermined vehicle condition to either extend or compress the hydraulic actuator, the control means including pressure control valves that are actuated to control the fluid pressure within the hydraulic actuator.