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1. EP1118719 - Système de régulation de la hauteur de lame d'une niveleuse motorisée

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims

1. An apparatus for controlling position of a blade of a machine that produces a graded surface of earth, wherein the machine has front wheels, rear wheels and a frame to which the blade is attached, said apparatus comprising:

first sensor which detects an amount of movement of the frame with respect to one of the rear wheels and the front wheels;

a controller which produces a compensation signal in response to the amount of movement; and

a mechanism which responds to the compensation signal by producing movement of the blade with respect to the earth.


  2. The apparatus as recited in claim 1 wherein the controller derives a change in position of the blade from the amount of movement.
  3. The apparatus as recited in claim 1 or claim 2, wherein the mechanism moves the blade with respect to the frame.
  4. The apparatus as recited in claim 3 wherein the mechanism comprises a fluid cylinder that couples the blade to the frame.
  5. The apparatus as recited in claim 4 wherein the mechanism further comprises a valve assembly which controls flow of fluid to the fluid cylinder in response to the compensation signal from the controller.
  6. The apparatus as recited in claim 3 further comprising a second sensor that detects a position of the blade relative to the frame and provides a blade position indication to the controller.
  7. The apparatus as recited in claim 6 wherein the controller produces the blade movement signal further in response to the blade position indication.
  8. The apparatus as recited in claim 1 wherein the mechanism moves one of the rear wheels and the front wheels with respect to the frame.
  9. The apparatus recited in claim 8 further comprising a second sensor that detects a position of the one of the rear wheels and the front wheels relative to the frame, and provides a wheel position indication; and the controller produces the compensation signal further in response to the wheel position indication.
  10. The apparatus as recited in claim 1 wherein the mechanism moves the front wheels with respect to the frame.
  11. An apparatus for controlling position of a blade of a earth moving machine, having a frame to which the blade is attached, front wheels coupled to the frame, and rear wheels mounted on an arm that pivots with respect to the frame, said apparatus comprising:

a first sensor detecting an amount that the arm pivots with respect to the frame and producing a pivot angle indication;

a controller which derives a change in blade position from the amount of movement, and produces a compensation signal in response to the change in blade position; and

a mechanism which moves the blade in response to the compensation signal.


  12. The apparatus as recited in claim 11 wherein the mechanism moves the blade with respect to the frame.
  13. The apparatus as recited in claim 12 wherein the mechanism comprises a fluid cylinder that couples the blade to the frame, and valve assembly which controls flow of fluid to the fluid cylinder in response to the compensation signal from the controller.
  14. The apparatus as recited in any one of claims 11 to 13 further comprising a second sensor that detects a position of the blade relative to the frame and provides a blade position indication; and the controller produces the compensation signal further in response to the blade position indication.
  15. An apparatus for controlling position of a blade of a earth moving machine, having a frame to which the blade is attached, front wheels coupled to the frame, and rear wheels mounted on an arm that pivots with respect to the frame, said apparatus comprising:

a first sensor detecting an amount that the arm pivots with respect to the frame and producing a pivot angle indication;

a controller which derives a change in blade position from the amount of movement, and produces a compensation signal in response to the change in blade position; and

a mechanism which responds to the compensation signal by moving the front wheel with respect to the frame.


  16. The apparatus as recited in claim 15 further comprising a second sensor that detects a position of the front wheels relative to the frame, and provides a wheel position indication; and the controller further responds to the wheel position indication by producing the compensation signal.
  17. Any novel combination of the earth moving apparatus substantially as herein described and/or as illustrated in the accompanying drawings.