Apparatus for controlling a power-assisted steering gear in response to vehicle speed
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B62D-005/06
출원번호
US-0397613
(2003-03-26)
발명자
/ 주소
Williams, Daniel E.
Redin, Juan
Peterson, Philip S.
Szabela, William A.
출원인 / 주소
TRW Automotive U.S. LLC
대리인 / 주소
Tarolli, Sundheim, Covell &
인용정보
피인용 횟수 :
2인용 특허 :
21
초록▼
An apparatus (10) for helping to turn steerable wheels (12) of a vehicle comprises a hydraulic power-assisted steering gear (16). An electric motor (92) actuates the steering gear (16). A pump (84) supplies the steering gear (16) with hydraulic fluid. A vehicle speed sensor (102) senses vehicle spee
An apparatus (10) for helping to turn steerable wheels (12) of a vehicle comprises a hydraulic power-assisted steering gear (16). An electric motor (92) actuates the steering gear (16). A pump (84) supplies the steering gear (16) with hydraulic fluid. A vehicle speed sensor (102) senses vehicle speed and provides a vehicle speed signal. A controller (104) is responsive to the vehicle speed signal for controlling the pump (84). The controller (104) activates the pump (84) to supply hydraulic fluid to the steering gear (16) when the vehicle speed signal indicates a vehicle speed below a predetermined value and the controller (104) deactivating the pump (84) when the vehicle speed signal indicates a vehicle speed above the predetermined value.
대표청구항▼
1. An apparatus for helping to turn steerable wheels of a vehicle, the apparatus comprising:a hydraulic power-assisted steering gear;an electric motor for actuating the steering gear;a pump for supplying the steering gear with hydraulic fluid;a vehicle speed sensor for sensing vehicle speed and for
1. An apparatus for helping to turn steerable wheels of a vehicle, the apparatus comprising:a hydraulic power-assisted steering gear;an electric motor for actuating the steering gear;a pump for supplying the steering gear with hydraulic fluid;a vehicle speed sensor for sensing vehicle speed and for providing a vehicle speed signal;a controller responsive to the vehicle speed signal for controlling the pump, the controller activating the pump to supply hydraulic fluid to the steering gear when the vehicle speed signal indicates a vehicle speed below a predetermined value and the controller deactivating the pump when the vehicle speed signal indicates a vehicle speed above the predetermined value; andwherein said electric motor is operatively connected to said steering gear to actuate said steering gear but not drive said pump.2. The apparatus of claim 1 wherein the electric motor is responsive to rotation of a hand wheel of the vehicle for actuating the steering gear, the controller controlling the electric motor to provide a predetermined resistance to rotation of the hand wheel.3. An apparatus for helping to turn steerable wheels of a vehicle, the apparatus comprising:a hydraulic power-assisted steering gear having a valve which is actuated to actuate the steering gear;an electric motor for actuating the steering gear;a pump for supplying the steering gear with hydraulic fluid;a vehicle speed sensor for sensing vehicle speed and for providing a vehicle speed signal;a controller responsive to the vehicle speed signal for controlling the pump, the controller activating the pump to supply hydraulic fluid to the steering gear valve when the vehicle speed signal indicates a vehicle speed below a predetermined value and the controller deactivating the pump when the vehicle speed signal indicates a vehicle speed above the predetermined value;wherein said electric motor is operatively connected to said steering gear to actuate said steering gear valve;an engine of the vehicle, when coupled to the pump, drives the pump to supply hydraulic fluid to the steering gear,said apparatus further including a clutch mechanism actuatable between a first condition that couples the pump to the engine and a second condition that decouples the pump from the engine, the controller controlling actuation of the clutch mechanism.4. An apparatus for helping to turn steerable wheels of a vehicle, the apparatus comprising:a hydraulic power-assisted steering gear having a valve which is actuated to actuate the steering gear;an electric motor for actuating the steering gear, said electric motor is responsive to rotation of a hand wheel of the vehicle for actuating the steering gear;a pump for supplying the steering gear with hydraulic fluid;a vehicle speed sensor for sensing vehicle speed and for providing a vehicle speed signal;a controller responsive to the vehicle speed signal for controlling the pump, the controller activating the pump to supply hydraulic fluid to the steering gear valve when the vehicle speed signal indicates a vehicle speed below a predetermined value and the controller deactivating the pump when the vehicle speed signal indicates a vehicle speed above the predetermined value, said controller controlling the electric motor to provide a predetermined resistance to rotation of the hand wheel; andwherein said electric motor is operatively connected to said steering gear to actuate said steering gear valve.5. The apparatus of claim 4 wherein said steering gear includes a torsion bar, a column torque sensor operatively connected to said torsion bar for sensing the column torque of said torsion bar and for providing a signal indicative of the column torque of said torsion bar, wherein said controller is responsive to said signal indicative of the column torque of said torsion bar for controlling the electric motor.6. An apparatus for helping to turn steerable wheels of a vehicle, the apparatus comprising:an electric motor actuatable to turn the steerable wheels;a hydraulic power-assisted steering mechanism for assisting the electric motor to turn the steerable wheels at vehicle speeds below a predetermined value, said hydraulic power-assisted steering mechanism including a steering gear having a valve which is actuated to actuate the steering gear;a pump for supplying the hydraulic power-assisted steering mechanism with hydraulic fluid, said steering gear includes at least one chamber and wherein said valve is a control valve for directing the fluid from said pump to said chamber of said steering gear;a controller for controlling the pump, the controller activating the pump to supply hydraulic fluid to the steering gear valve of the hydraulic power-assisted steering mechanism when the vehicle speed is below the predetermined value and the controller deactivating the pump when the vehicle speed is above the predetermined value; andwherein said electric motor is operatively connected to said steering gear to actuate said steering gear valve.7. The apparatus of claim 6 wherein said controller controls said electric motor based on the lateral acceleration f the vehicle.8. The apparatus of claim 7 wherein said steering gear includes a torsion bar, a column torque sensor operatively connected to said torsion bar for sensing the column torque of said torsion bar and for providing a signal indicative of the column torque of said torsion bar, wherein said controller is responsive to said signal indicative of the column torque of said torsion bar for controlling the electric motor.9. The apparatus of claim 6 including a torsion bar, wherein said control valve includes a valve core portion and a valve sleeve portion that are connected together through said torsion bar.10. The apparatus of claim 9 wherein when the resistance to turning the steerable wheels is above a predetermined amount, said torsion bar causes said valve core portion to rotate relative to said valve sleeve portion to cause said control valve to direct the fluid from said pump to said chamber of said steering gear.11. The apparatus of claim 6 wherein an engine of the vehicle, when coupled to the pump, drives the pump to supply hydraulic fluid to the hydraulic power-assisted steering mechanism, the apparatus further including a clutch mechanism actuatable between a first condition that couples the pump to the engine and a second condition that decouples the pump from the engine, the controller controlling actuation of the clutch mechanism.12. The apparatus of claim 6 wherein said steering gear includes a torsion bar, a column torque sensor operatively connected to said torsion bar for sensing the column torque of said torsion bar and for providing a signal indicative of the column torque of said torsion bar, wherein said controller is responsive to said signal indicative of the column torque of said torsion bar for controlling the electric motor.13. An apparatus for helping to turn steerable wheels of a vehicle, the apparatus comprising:a hydraulic power-assisted steering gear having a valve which is actuated to actuate the steering gear;an electric motor for actuating the steering gear;a pump for supplying the steering gear with hydraulic fluid;a vehicle speed sensor for sensing vehicle speed and for providing a vehicle speed signal;a controller responsive to the vehicle speed signal for controlling the pump, the controller activating the pump to supply hydraulic fluid to the steering gear valve when the vehicle speed signal indicates a vehicle speed below a predetermined value and the controller deactivating the pump when the vehicle speed signal indicates a vehicle speed above the predetermined value;wherein said electric motor is operatively connected to said steering gear to actuate said steering gear valve; anda lateral acceleration sensor for sensing the lateral acceleration of the vehicle and for providing a lateral vehicle acceleration signal, wherein said controller is responsive to the lateral vehicle acceleration signal for controlling the electric motor.14. The apparatus of claim 13 wherein said steering gear includes a torsion bar, a column torque sensor operatively connected to said torsion bar for sensing the column torque of said torsion bar and for providing a signal indicative of the column torque of said torsion bar, wherein said controller is responsive to said signal indicative of the column torque of said torsion bar for controlling the electric motor.15. An apparatus for helping to turn steerable wheels of a vehicle, the apparatus comprising:a hydraulic power-assisted steering gear having a valve which is actuated to actuate the steering gear; said steering gear includes at least one chamber and wherein said valve is a control valve for directing the fluid from said pump to said chamber of said steering gear;an electric motor for actuating the steering gear;a pump for supplying the steering gear with hydraulic fluid;a vehicle speed sensor for sensing vehicle speed and for providing a vehicle speed signal;a controller responsive to the vehicle speed signal for controlling the pump, the controller activating the pump to supply hydraulic fluid to the steering gear valve when the vehicle speed signal indicates a vehicle speed below a predetermined value and the controller deactivating the pump when the vehicle speed signal indicates a vehicle speed above the predetermined value; andwherein said electric motor is operatively connected to said steering gear to actuate said steering gear valve.16. The apparatus of claim 15 including a torsion bar, wherein said control valve includes a valve core portion and a valve sleeve portion that are connected together through said torsion bar.17. The apparatus of claim 16 wherein when the resistance to turning the steerable wheels is above a predetermined amount, said torsion bar causes said valve core portion to rotate relative to said valve sleeve portion to cause said control valve to direct the fluid from said pump to said chamber of said steering gear.18. An apparatus for helping to turn steerable wheels of a vehicle, the apparatus comprising:a hydraulic power-assisted steering gear having a valve which is actuated to actuate the steering gear;an electric motor for actuating the steering gear;a pump for supplying the steering gear with hydraulic fluid, said electric motor does not drive said pump;a vehicle speed sensor for sensing vehicle speed and for providing a vehicle speed signal;a controller responsive to the vehicle speed signal for controlling the pump, the controller activating the pump to supply hydraulic fluid to the steering gear valve when the vehicle speed signal indicates a vehicle speed below a predetermined value and the controller deactivating the pump when the vehicle speed signal indicates a vehicle speed above the predetermined value; andwherein said electric motor is operatively connected to said steering gear to actuate said steering gear valve.
Eckhardt Dennis C. (Saginaw MI) Graber David W. (Millington MI) Pawlak Andrzej M. (Troy MI) Faist Bryan L. (Frankenmuth MI), Electromagnetic control apparatus for varying the driver steering effort of a hydraulic power steering system.
Gunter Ahlert DE; Detlef Beckmann DE; Thomas Kind DE; Thomas Maier DE; Martin Rothmund DE; Wolfram Thomas DE; Jurgen Trost DE; Gert Volk DE, Hydraulic power steering system for motor vehicles.
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