Control of an active suspension system for a work vehicle based upon a parameter of another vehicle system

• US 5,941,920 A
• Filed: 11/12/1997
• Issued: 08/24/1999
• Est. Priority Date: 11/12/1997
• Status: Expired due to Term

• Current Assignee: Blue Leaf IP Incorporated (CNH Industrial N.V.), CNH Industrial America LLC (CNH Industrial N.V.)
• Original Assignee: Case Corporation (CNH Industrial N.V.)
• Inventors: Schubert, William L.
• Primary Examiner(s): NGUYEN, TAN QUANG
• Application Number:
  US08/969,147
• Time in Patent Office: 650 Days
• Field of Search: 701/50, 701/37, 701/38, 701/41, 701/51, 701/67, 701/70, 701/48, 280/840, 280/5.5, 280/5.515, 280/5.507, 180/89.12, 180/89.13, 180/89.15
• US Class Current: 701/37
• CPC Class Codes: B62D 33/0608 pneumatic or hydraulic suspension
• CPC Class Codes: F16F 15/02 Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems F16F15/005 takes precedence ; layered products B32B; suppression of vibration in ships B63; relieving load on bearings, using magnetic means F16C39/06

Abstract

An active suspension system for a work vehicle is disclosed herein. The system includes at least one active vibration isolator mounted between the chassis and cab of the vehicle. The isolator moves the cab relative to the chassis in response to a control signal generated by a control circuit. The control circuit communicates to a second vehicle system via a communication interface. The communicated data includes a parameter of the second vehicle system related to a force applied to the vehicle during operation of the second vehicle system. The control signal is generated at least partly in response to the parameter so as to minimize the vibration on the cab caused by operation of the second vehicle system. Cab movement may be disabled when ground speed of the vehicle is below a predetermined speed threshold or when an operator presence sensor detects that the operator is not present.

Claims

1. An active cab suspension system for a work vehicle, the work vehicle including a chassis, an operator'"'"'s cab disposed above the chassis, and another vehicle system having a parameter related to a force applied to the chassis which causes vibrations of the chassis which are transmitted to the cab, the active cab suspension system comprising:

at least one active vibration isolator mounted at a location between the cab and the chassis and responsive to a control signal to control movement of the cab relative to the chassis;

a communication interface coupled to the another vehicle system; and

control circuit coupled to the isolator and the communication interface, the control circuit configured to receive the parameter of the another vehicle system from the communication interface, to generate the control signal at least partly in response to the parameter, and to apply the control signal to the active vibration isolator to attenuate transmission of vibrations from the chassis to the cab, the vibrations caused by the force acting on the chassis, wherein frequency vibration isolation is provided between the chassis and the cab.

2. The active cab suspension system of claim 1 further including a first sensor configured to generate a first sensed signal indicative of movement of the cab caused by disturbances in the chassis, wherein the control signal primarily depends upon the first sensed signal and secondarily upon the parameter of the another vehicle system.

3. The active cab suspension system of claim 2 further including a second sensor configured to generate a second sensed signal indicative of displacement between the cab and the chassis, wherein the control signal further depends upon the second sensed signal.

4. The active cab suspension system of claim 2 wherein the parameter of the another vehicle system causes a change in system gain.

5. The active cab suspension system of claim 1 wherein the work vehicle includes a tractor and the parameter is a draft force signal indicative of a draft force applied to the work vehicle by an implement.

6. The active cab suspension system of claim 1 wherein the parameter is a clutch signal indicative of a clutch force applied to the work vehicle.

7. The active cab suspension system of claim 1 wherein the parameter is a gear shift signal indicative of a gear shift force applied to the work vehicle.

8. The active cab suspension system of claim 1 wherein the parameter is a brake signal indicative of a braking force applied to the work vehicle.

9. The active cab suspension system of claim 1 wherein the parameter is a speed actuator signal indicative of an acceleration force applied to the vehicle.

10. The active cab suspension system of claim 1 further comprising an operator presence sensor coupled to the control circuit, wherein active movement of the cab is disabled when presence of the operator is not detected.

11. The active cab suspension system of claim 1, wherein the frequency vibration isolation provided between the chassis and the cab isolates the transmission of low-frequency vibrations between the chassis and the cab.

12. The active cab suspension system of claim 11, wherein the low-frequency vibrations are below 20 Hz.

13. The active cab suspension system of claim 1, wherein the communication interface includes a vehicle data bus.

14. A work vehicle, comprising:

a chassis;

an operator'"'"'s cab disposed above the chassis;

an active cab suspension system including at least one active vibration isolator mounted between the cab and the chassis and responsive to a control signal to control movement of the cab relative to the chassis;

another vehicle system having a parameter related to a force applied to the chassis which causes vibrations of the chassis which are transmitted to the cab; and

a communication interface coupled between the active cab suspension system and the another vehicle system;

wherein the active cab suspension system further includes a control circuit coupled to the communication interface and configured to receive the parameter of the another vehicle system, to generate the control signal at least partly in response to the parameter, and to apply the control signal to the active vibration isolator to attenuate transmission of vibrations from the chassis to the cab, the vibrations caused by the force acting on the chassis, wherein frequency vibration isolation is provided between the chassis and the cab.

15. The work vehicle of claim 14 further including a first sensor configured to generate a first sensed signal indicative of movement of the cab caused by disturbances in the chassis, wherein the control signal depends primarily upon the first sensed signal and secondarily upon the parameter of the another vehicle system.

16. The work vehicle of claim 14 wherein the work vehicle is a tractor, the another vehicle system includes a height control system coupled to an implement, and the parameter is a draft force signal indicative of a draft force applied to the work vehicle by the implement.

17. The work vehicle of claim 14 wherein the another vehicle system is selected from the group consisting of a steering control system, a clutch control system, a transmission control system, a brake control system and a speed control system, and the parameter is indicative of a force applied to the vehicle by the selected another vehicle system.

18. An active seat suspension system for a work vehicle, the work vehicle including a chassis, an operator'"'"'s seat supported by the chassis, and a second vehicle system having a parameter related to a force applied to the chassis which causes vibrations of the chassis which are transmitted to the seat, the active seat suspension system comprising:

at least one active vibration isolator mounted at a location between the seat and the chassis and responsive to a control signal to control movement of the seat relative to the chassis;

a communication interface coupled to the second vehicle system; and

a control circuit coupled to the communication interface and the active vibration isolator, the control circuit configured to receive the parameter of the second vehicle system from the communication interface, and to generate the control signal applied to the vibration isolator at least partly in response to the parameter, wherein transmission of vibrations from the chassis to the seat is attenuated, the vibrations caused by the force acting on the chassis, wherein frequency vibration isolation is provided between the chassis and the seat.

19. The active seat suspension system of claim 18 further including a first sensor configured to generate a first sensed signal indicative of movement of the seat caused by disturbances in the chassis, the control signal depending primarily upon the first sensed signal and secondarily upon the parameter of the second vehicle system.

20. The active seat suspension system of claim 19 further including a second sensor configured to generate a second sensed signal indicative of displacement between the seat and the chassis, the control signal further depending upon the second sensed signal.

21. The active seat suspension system of claim 18 wherein the second vehicle system includes a clutch and the parameter is a clutch signal indicative of a clutch force applied to the vehicle, and movement of the seat due to the clutch force is attenuated.

22. The active seat suspension system of claim 18 wherein the second vehicle system includes a transmission and the parameter is a gear shift signal indicative of a gear shift force applied to the vehicle, and movement of the seat due to the gear shift force is attenuated.

23. The active seat suspension system of claim 18 wherein the second vehicle system includes a brake and the parameter is a brake signal indicative of a braking force applied to the vehicle, and movement of the seat due to the braking force is attenuated.

24. The active seat suspension system of claim 18 wherein the second vehicle system includes a speed actuator and the parameter is a speed actuator signal indicative of an acceleration force applied to the vehicle, and movement of the seat due to the acceleration force is attenuated.

25. An active cab suspension system for a work vehicle, the work vehicle including a chassis, an operator'"'"'s cab disposed above the chassis, and a second vehicle system having a parameter related to ground speed of the work vehicle, the active cab suspension system comprising:

at least one active vibration isolator mounted at a location between the cab and the chassis and responsive to a control signal to control movement of the cab relative to the chassis;

a communication interface coupled to the second vehicle system; and

a control circuit coupled to the communication interface and the active vibration isolator, the control circuit configured to receive the parameter of the second vehicle system from the communication interface, to generate the control signal applied to the isolator to attenuate movement of the cab when the ground speed is above a predetermined speed threshold, and to disable cab movement when the ground speed is below the threshold.

26. An active cab suspension system for a work vehicle, the work vehicle including a chassis, an operator'"'"'s cab disposed above the chassis, and another vehicle system having a parameter related to a force about to be applied to the work vehicle, the active cab suspension system comprising:

at least one active vibration isolator mounted at a location between the cab and the chassis and responsive to a control signal to control movement of the cab relative to the chassis;

a communication interface coupled to the another vehicle system; and

a control circuit coupled to the isolator and the communication interface, the control circuit configured to receive the parameter of the another vehicle system from the communication interface, to predict the force about to be applied to the work vehicle based upon the parameter, to generate the control signal at least partly in response to the predicted force, and to apply the control signal to the active vibration isolator to attenuate movement of the cab due to the force about to be applied to the work vehicle, wherein the parameter is used as a preparatory signal.

27. The active cab suspension system of claim 26, wherein the application of the control signal to the active vibration isolator causes a bias in fluid supply to the active vibration isolator.