Delphi Technologies, Inc.

David Burke

Philippe Germain

Robin Oakley

() A roll control system () for installation between axially aligned wheels of a motor vehicle, the roll control system comprising a torsion bar (); a damper () attached to one end () of the torsion bar and attachable to one of the wheels; and attachment means () attached to the other end () of the torsion bar and attachable to the other wheel; wherein the damper comprises an axially extending cylindrical housing (); a piston () slidably mounted inside the housing; a piston rod () connected to the piston, extending out of one end () of the housing, and movable in an axial direction relative to the housing; a floating piston () slidably mounted in the housing between the piston and the other end of the housing; a compensation chamber () between the floating piston and the other end () of the housing containing a first pressurised fluid; a compression chamber () between the floating piston and the piston containing a second pressurised fluid; a rebound chamber () between the piston and the one end of the housing containing the second pressurised fluid; valve means () on the piston allowing restricted flow of the second pressurised fluid between the compression chamber and the rebound chamber; a rebound stop () positioned in the rebound chamber between the piston and the one end of the housing and providing a spring-effect on the movement of the piston towards the one end of the housing; and a compression stop () providing a spring-effect on the movement of the piston towards the floating piston. Provides an improved passive roll controle system.

Roll control system for a motor vehicle

A vehicle roll control system has a torsion bar and a first arm extending substantially perpendicular to the torsion bar. The first arm is fixed to the torsion bar at one end and connectable to one of the axles at the other end. A hydraulic actuator is attached to the torsion bar; and a control connected to the hydraulic actuator controls the operation thereof on detection of a predetermined vehicle condition. The hydraulic actuator comprises a housing, a piston making a sealing sliding fit inside the housing to define a first fluid chamber and a second fluid chamber, and a piston rod connected to the piston and extending through the second fluid chamber and out of the housing. The control acts on detection of the predetermined vehicle condition either to apply substantially the same fluid pressure to the first and second fluid chambers when the piston tends to move in a first direction to extend the hydraulic actuator or to apply a fluid pressure to the second fluid chamber above the fluid pressure in the first fluid chamber when the piston tends to move in a second direction to compress the hydraulic actuator. The first fluid chamber is fluidly connected to a fluid reservoir by the control when the piston tends to move in the second direction, and the control comprises a fluid pump and a directional valve, the pump being fluidly connected to the second fluid chamber and the directional valve being capable of moving between a first position in which the first fluid chamber and the second fluid chamber are fluidly connected, and a second position in which the first fluid chamber is fluidly connected to the fluid reservoir.

Vehicle roll control system

A roll control system for installation between axially aligned wheels of a motor vehicle, the roll control system comprising a torsion bar; a first hydraulic actuator attached to one end of the torsion bar and attachable to one of the wheels; a second hydraulic actuator attached to the other end of the torsion bar and attachable to the other wheel; and an electronic control unit monitoring one or more predetermined vehicle operating conditions; wherein the first and second hydraulic actuators are substantially identical, each comprising a compression chamber containing hydraulic fluid, a rebound chamber containing hydraulic fluid, a movable piston between and fluidly isolating the compression chamber and the rebound chamber, a piston rod connected to the piston and extending through the rebound chamber, a gas chamber containing pressurised gas acting on the hydraulic fluid in the rebound chamber, and an electrically operated valve between the compression chamber and the rebound chamber and actuated by the control unit dependent on the monitored conditions, the valve being actuable between a two-way position in which the valve allows hydraulic fluid to flow between the compression chamber and the rebound chamber and a one-way position in which the valve allows hydraulic fluid to flow from the rebound chamber into the compression chamber but not from the compression chamber into the rebound chamber. Reduces the risk of incorrect latching of the torsion bar.

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Couddes, France

David Burke