METHOD AND DEVICE FOR DETERMINING A HEIGHT OF LIFT OF A WORKING MACHINE

• US 20130204489A1
• Filed: 07/29/2011
• Published: 08/08/2013
• Est. Priority Date: 08/18/2010
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Wildner, Oliver
• Granted Patent: US 9,008,900 B2
• Time in Patent Office: Days
• US Class Current: 701/34.4
• CPC Class Codes: B66F 9/0755 Position control; Position detectors
• CPC Class Codes: B66F 9/24 Electrical devices or systems

Abstract

In a method for determining a height of lift of a working machine, a measurement of height is carried out between a position along an approximately vertical axis of motion of a lifting element of the working machine and a reference point. In order to implement a correct determination of the height of lift even in response to inhomogeneous ground conditions, the ground on which the working machine is located is used as the reference point, and for the height measurement a plurality of measuring signals are ascertained, which are supplied to a mean value formation, the mean value being drawn upon for determining the height of lift.

Claims

1-10. -10. (canceled)

11. A method for determining an overall height of lift of a lifting element of a working machine, comprising:

performing a measurement of height between a position along an approximately vertical axis of motion of the lifting element of the working machine and a reference point, wherein the ground on which the working machine is located is used as the reference point, and wherein for the measurement of height multiple measuring signals are ascertained; and

forming a mean value of the multiple measuring signals, wherein the mean value is used for determining the overall height of lift.

12. The method as recited in claim 11, wherein the overall height of lift is determined by two height measurement systems measuring side-by-side, a first partial height of lift being determined from a first fixed point on the working machine up to the lifting element, and a second partial height of lift being ascertained from a second fixed point on the working machine down to the ground.

13. The method as recited in claim 12, wherein:

multiple measuring signals are obtained for determining the second partial height of lift, and wherein the second partial height is determined based on the mean value of the multiple measuring signals for determining the second partial height of lift; and

for determining the overall height of lift of the lifting element above the ground, the second partial height of lift determined based on the mean value of the multiple measuring signals is added to the first partial height of lift which is ascertained not using a mean value calculation.

14. The method as recited in claim 12, wherein the first fixed point on the working machine and the second fixed point on the working machine are situated approximately at the same height, and wherein the first partial height of lift and the second partial height of lift are added to determine the overall height of lift.

15. The method as recited in claim 13, wherein:

the first fixed point and the second fixed point on the working machine are separated from each other by an approximately vertical distance; and

the distance between the first and the second fixed points is added to the first partial height of lift and the second partial height of lift to determine the height of lift of the lifting element above the ground.

16. The method as recited in claim 12, wherein for determining the second partial height of lift, the ground is scanned at low frequency.

17. A device for determining an overall height of lift of a lifting element of a working machine, comprising:

a height measurement system for performing a measurement of height, the height measurement system located between a position along an approximately vertical axis of motion of the lifting element of the working machine and a reference point, wherein the ground on which the working machine is located is used as the reference point, and wherein for the measurement of height multiple measuring signals are ascertained; and

means for forming a mean value of the multiple measuring signals, wherein the mean value is used for determining the overall height of lift.

18. The device as recited in claim 17, wherein the height measurement system includes two height measurement devices located substantially side-by-side, the first height measurement device determining a first partial height of lift from a first fixed point on the working machine up to the lifting element, and the second height measuring device ascertaining a second partial height of lift from a second fixed point on the working machine down to the ground, wherein multiple measuring signals are obtained for determining the second partial height of lift, and wherein the second partial height is determined based on the mean value of the multiple measuring signals for determining the second partial height of lift.

19. The device as recited in claim 18, wherein the first height measurement devices includes a first sensor for wireless determination of the first partial height of lift and the second height measurement devices includes a second sensor for wireless determination of the second partial height of lift.

20. The device as recited in claim 19, wherein at least one of the first and second sensors is configured as one of a laser sensor an ultrasonic sensor.