Enhanced computer optimized adaptive suspension system and method

• US 7,076,351 B2
• Filed: 07/24/2002
• Issued: 07/11/2006
• Est. Priority Date: 11/11/1998
• Status: Expired due to Fees

• Current Assignee: The Kenmar Company Trust
• Original Assignee: Great Northern Technologies LLC
• Inventors: Hamilton, James M., Woods, Lonnie K.
• Primary Examiner(s): SHAW, PELING ANDY
• Application Number:
  US10/205,205
• Publication Number:
  US 20030001346A1
• Time in Patent Office: 1,448 Days
• Field of Search: 701/37, 701/36, 701/1, 701/38, 280/5.5, 280/5.514, 267/2, 267/136, 267/182, 703/8, 703/22
• US Class Current: 701/37
• CPC Class Codes: B60G 17/0152 characterised by the action on a particular type of suspension unit B60G17/01941 takes precedence
• CPC Class Codes: B60G 17/018 characterised by the use of a specific signal treatment or control method
• CPC Class Codes: B60G 17/019 characterised by the type of sensor or the arrangement thereof B60G17/01941 takes precedence
• CPC Class Codes: B60G 17/0408 details, e.g. antifreeze for suspension fluid, pumps, retarding means per se
• CPC Class Codes: B60G 17/08 Characteristics of fluid dampers adjusting fluid dampers in general F16F9/44 - F16F9/53
• CPC Class Codes: B60G 2202/413 Hydraulic actuator
• CPC Class Codes: B60G 2202/416 using a pump, e.g. in the line connecting the lower chamber to the upper chamber of the actuator
• CPC Class Codes: B60G 2204/111 on pneumatic springs
• CPC Class Codes: B60G 2204/112 on dampers, e.g. fluid dampers
• CPC Class Codes: B60G 2206/41 Dampers
• CPC Class Codes: B60G 2400/102 vertical
• CPC Class Codes: B60G 2400/25 Stroke; Height; Displacement
• CPC Class Codes: B60G 2400/252 vertical
• CPC Class Codes: B60G 2401/26 Resistance type, e.g. as level indicator
• CPC Class Codes: B60G 2500/10 Damping action or damper
• CPC Class Codes: B60G 2600/184 Semi-Active control means
• CPC Class Codes: B60G 2800/012 Rolling condition
• CPC Class Codes: F15B 11/028 for controlling the actuating force F15B11/024 takes precedence
• CPC Class Codes: F15B 2211/40515 with variable throttles or orifices
• CPC Class Codes: F15B 2211/41536 being connected to multiple ports of an output member
• CPC Class Codes: F15B 2211/426 : electrically or electronically
• CPC Class Codes: F15B 2211/50572 : using a pressure compensating valve for controlling the pressure difference across a flow control valve
• CPC Class Codes: F15B 2211/526 : electrically or electronically
• CPC Class Codes: F15B 2211/6313 : the pressure being a load pressure
• CPC Class Codes: F15B 2211/6336 : representing a state of the output member, e.g. position, speed or acceleration
• CPC Class Codes: F15B 2211/6653 : Pressure control
• CPC Class Codes: F15B 2211/7053 : Double-acting output members
• CPC Class Codes: F16F 9/466 : Throttling control, i.e. regulation of flow passage geometry F16F9/464, F16F9/465 take precedence

Abstract

A system and method for controlling a damping system. The system has at least two dampers for damping between sprung and unsprung masses in the compression and rebound directions. Sensors generate signals based on position and other parameters of motion representative of the displacement between the sprung and unsprung masses. The process determines the appropriate compression and rebound forces to be applied at the wheels. A regulator responds to at least one of the independent compression and rebound control signals for adjusting, respectively, at least one of compression and rebound resisting forces of the dampers between the masses. Compliance for the dampers is emulated with software to produce the desired compliance forces. The distributed controller includes a processor that is responsive to signals representative of the position signals for forming the compression and rebound control signals for the regulator as a function of motion between the masses or a motion of a vehicle in which the dampers are located. The system has the capability of locking the suspension when parked.

Claims

1. A control system for controlling the damping response of a vehicle suspension system comprising:

a suspension control unit having an integral wheel position sensing device to determine the position of a wheel and a damper for applying a force on the wheel; and

a distributed controller architecture for calculating the damping force to be applied to the vehicle suspension system by the damper based upon the wheel position determined by the wheel position sensing device,

wherein the distributed controller architecture determines simulated compression and rebound forces of a simulated accumulator required to provide mechanical compliance as a function of the position of the wheel and adjusts the compression and rebound forces applied by the damper to emulate mechanical compliance of the simulated accumulator.

2. The control system of claim 1 wherein the distributed controller architecture provides software emulation of mechanical compliance of a hydraulic accumulator.

3. The control system of claim 1 in which the distributed controller comprises a central processing unit with individual controllers for each wheel operating under the direction of the central processing unit.

4. The control system of claim 1, wherein the distribution controller architecture provides emulation of mechanical compliance by application of control signals to the damper.

5. The control system of claim 1 in which the suspension control unit'"'"'s damper shaft is lockable in position.

6. The control system of claim 1 further comprising one or more sensor for generating one or more parameters of motion and wherein the distributed controller architecture comprises means for preconditioning the one or more parameters of motion and wherein the distributed controller architecture calculates the damping force to be applied to the vehicle suspension system by the damper based upon the wheel position determined by the wheel position sensing device and the one or more preconditioned parameters of motion.

7. The control system of claim 1 wherein the distributed controller architecture comprises means for determining vehicle loading as a function of spring natural frequency of the vehicle suspension and means for modifying the damping force to be applied to the vehicle suspension system to compensate for variations in vehicle loading.

8. The control system of claim 1 wherein the wheel position sensing device determines direction of travel of wheel and wherein the distributed controller architecture adjusts the compression and rebound forces applied by the damper to emulate mechanical compliance of the simulated accumulator as a function of direction of travel of the wheel.

9. The control system of claim 1 wherein the simulated accumulator is a simulated energy storing accumulator.

10. A control system for controlling the damping response of a vehicle suspension system comprising:

a suspension control unit having an integral wheel position sensing device to determine the position of a wheel and a damper capable of applying a force on the wheel;

end

a distributed controller architecture for calculating the damping force to be applied to the vehicle suspension system by the damper based upon the wheel position determined by the wheel position sensing device, wherein the suspension control unit'"'"'s position sensing device comprises a temperature sensor for determining absolute wheel position, wherein the distributed controller architecture determines simulated compression and rebound forces to provide mechanical compliance in response to adjust the compression and rebound forces applied by the damper.

11. A method for controlling the damping response of a vehicle suspension comprising:

determining velocity of a damper shaft coupled to a wheel;

determining compression and rebound forces to be applied to the wheel based upon parameters of motion;

determining simulated compression and rebound forces of a simulated accumulator required to provide mechanical compliance; and

modifying the compression and rebound forces applied to the wheel to emulate the mechanical compliance of the simulated accumulator in accordance with the simulated compression and rebound forces.

12. The method of claim 11 wherein the simulated accumulator comprises a simulated mechanical accumulator.

13. The method of claim 11 wherein the simulated accumulator comprises a simulated hydraulic accumulator.

14. The method of claim 11 further comprising preconditioning the plurality of parameters of motion.

15. The method of claim 11 further comprising determining vehicle loading as a function of spring natural frequency of the vehicle suspension and modifying the compression and rebound forces to provide compensation for variations of vehicle loading.

16. The method of claim 11 wherein determining velocity of a damper shaft coupled to a wheel comprises determining direction of travel of the damper shaft and wherein determining simulated compression and rebound forces of a simulated accumulator required to provide mechanical compliance comprises determining simulated compression and rebound forces of a simulated accumulator required to provide mechanical compliance as a function of direction of travel of the damper shaft.

17. The method of claim 11 wherein determining simulated compression and rebound forces of a simulated accumulator required to provide mechanical compliance comprises comparing a calculated compression force to a composite set of compression forces and determining compression force of a simulated accumulator required to provide mechanical compliance as a function of said comparison.

18. The method of claim 17 wherein determining compression force of a simulated accumulator required to provide mechanical compliance as a function of said comparison comprises determining a position of a simulated spring when the calculated compression force is less than the composite set of compression forces.

19. The control system of claim 11 wherein the simulated accumulator is a simulated energy storing accumulator.

20. A method for controlling the damping response of a vehicle suspension comprising:

determining compression and rebound forces to be applied to a wheel based upon parameters of motion;

determining vehicle loading as a function of spring natural frequency of the vehicle suspension by determining vehicle loading as a function of a ratio of spring natural frequency and one half the spring natural frequency of the suspension; and

modifying the compression and rebound forces to provide compensation for variation of vehicle loading.

21. A method for controlling the damping response of a vehicle suspension comprising:

determining compression and rebound forces to be applied to a wheel based upon parameters of motion;

determining vehicle loading as a function of spring natural frequency of the vehicle suspension;

modifying the compression and rebound forces to provide compensation for variation of vehicle loading;

simulating compression and rebound forces of a simulated accumulator required to provide mechanical compliance as a function of the parameters of motion; and

modifying the compression and rebound forces applied to the wheel to emulate the mechanical compliance of the simulated accumulator.