Hydraulic control circuit

• US 7,735,846 B2
• Filed: 07/24/2007
• Issued: 06/15/2010
• Est. Priority Date: 09/19/2006
• Status: Active Grant

• Current Assignee: BWI Company Limited SA (Shougang Corporation)
• Original Assignee: BWI Company Limited SA (Shougang Corporation)
• Inventors: Germain, Philippe
• Primary Examiner(s): Dickson; Paul N
• Assistant Examiner(s): BROWN, DREW J
• Application Number:
  US11/880,782
• Publication Number:
  US 20080067770A1
• Time in Patent Office: 1,057 Days
• Field of Search: 280/5.506, 280/5.508, 280/124.106, 280/124.16, 280/124.161, 280/5.511, 280/5.507, 280/5.505, 280/124.157
• US Class Current: 280/124.16
• CPC Class Codes: B60G 17/0162 mainly during a motion involving steering operation, e.g. cornering, overtaking B60G17/0164 takes precedence
• CPC Class Codes: B60G 21/0555 including an actuator inducing vehicle roll
• CPC Class Codes: B60G 2202/135 Stabiliser bar and/or tube
• CPC Class Codes: B60G 2202/413 Hydraulic actuator
• CPC Class Codes: B60G 2400/204 Vehicle speed
• CPC Class Codes: B60G 2800/012 Rolling condition
• CPC Class Codes: B60G 2800/9122 ARS - Anti-Roll System Control

Abstract

A hydraulic control circuit (100) comprises a source (180) of fluid pressure having a fluid inlet (201) and a fluid outlet (202); a fluid reservoir (181) fluidly connected to the fluid inlet of the pressure source; an attenuation means (111) having a fluid inlet (203) fluidly connected to the fluid outlet of the pressure source, and a fluid outlet (204); a pressure control valve (199) fluidly connected to the fluid inlet of the attenuation means and to the fluid reservoir or the fluid inlet of the pressure source; and one or more valves (82-84) fluidly connected to the fluid outlet of the attenuation means.

Claims

1. A hydraulic control circuit comprising a source of fluid pressure having a fluid inlet and a fluid outlet;

a fluid reservoir fluidly connected to the fluid inlet of the pressure source;

an attenuation means having a fluid inlet fluidly connected to the fluid outlet of the pressure source, and a fluid outlet;

a pressure control valve fluidly connected to the fluid inlet of the attenuation means and to at least one of the fluid reservoir and the fluid inlet of the pressure source; and

at least one valve fluidly connected to the fluid outlet of the attenuation means.

2. A hydraulic control circuit as claimed in claim 1, wherein the source of fluid pressure is a pump.

3. A hydraulic control circuit as claimed in claim 1, wherein the attenuation means is an attenuation hose.

4. A hydraulic control circuit as claimed in claim 1 wherein the attenuation means is a restricted flow orifice.

5. A vehicle roll control system for a vehicle having a pair of wheels each rotatable on an axle, comprising a torsion bar;

a first arm attached to the torsion bar at one end of the first arm and being connectable to one of the axles of the wheels at the other end of the first arm;

a hydraulic actuator attached to the torsion bar; and

a control means connected to the hydraulic actuator and controlling the operation thereof on detection of a predetermined vehicle condition;

wherein the control means comprises a hydraulic control circuit as claimed in claim 1.

6. A hydraulic control circuit, comprising:

a source of fluid pressure having a fluid inlet and a fluid outlet;

a fluid reservoir in fluid communication with said fluid inlet of said pressure source;

an attenuation means having a fluid inlet in fluid communication with said fluid outlet of said pressure source and having a fluid outlet;

at least one valve in fluid communication with said fluid outlet of said attenuation means; and

a pressure control valve in fluid communication with said fluid reservoir and disposed hydraulically between said fluid outlet of said source of fluid pressure and said fluid inlet of said attenuation means for conveying fluid to the attenuation means only when said at least one valve is actuated and for re-circulating the rest of the fluid to one of said fluid reservoir and said fluid inlet of said pump.