Dynamic payload monitor
First Claim
1. An apparatus for dynamically measuring and indicating payload weight for a vehicle having at least one implement linkage including a linkage connection pivot pin, said vehicle including at least one lift cylinder and at least one tilt cylinder for modifying said implement linkage geometry, said apparatus comprising:
- means for sensing the hydraulic pressure of said lift cylinder and responsively producing a first signal;
means for sensing the hydraulic pressure of said tilt cylinder and responsively producing a second signal;
means for sensing said implement linkage geometry and responsively producing a third signal; and
means for receiving said first, second, and third signals and responsively deriving a payload weight.
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Accused Products
Abstract
A dynamic payload monitor measures and displays payload weight for a loader vehicle during tip loading by sensing the hydraulic pressure of the lift and tilt cylinders and the geometry of an implement linkage. The payload weight is computed by curve fitting the sensed lift cylinder pressure and geometry data to a second order polynomial, and then performing interpolation or extrapolation with a pair of pressure versus position reference parabolas obtained during calibration. Tilt cylinder curves are derived by curve fitting tilt cylinder pressure and lift cylinder geometry data to a third order polynomial. The tilt cylinder curves are then compared to a plurality of tabulated tilt cylinder curves. Tip loading conditions are detected and the computed payload weight is modified in response to the magnitude of the tilt cylinder pressure. The weight computation algorithms used in the dynamic payload monitor are applicable to a number of work vehicles having at least one work implement linkage and at least two hydraulic cylinders for modifying the linkage geometry.
72 Citations
14 Claims
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1. An apparatus for dynamically measuring and indicating payload weight for a vehicle having at least one implement linkage including a linkage connection pivot pin, said vehicle including at least one lift cylinder and at least one tilt cylinder for modifying said implement linkage geometry, said apparatus comprising:
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means for sensing the hydraulic pressure of said lift cylinder and responsively producing a first signal; means for sensing the hydraulic pressure of said tilt cylinder and responsively producing a second signal; means for sensing said implement linkage geometry and responsively producing a third signal; and means for receiving said first, second, and third signals and responsively deriving a payload weight. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for dynamically measuring and indicating payload weight for a vehicle having at least one implement linkage including a linkage connection pivot pin, said vehicle including at least one lift cylinder and at least one tilt cylinder for modifying said implement linkage geometry, said method comprising the steps of:
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sensing the hydraulic pressure of said lift cylinder and responsively producing a first signal; sensing the hydraulic pressure of said tilt cylinder and responsively producing a second signal; sensing said implement linkage geometry and responsively producing a third signal; and receiving said first, second, and third signals and responsively deriving a payload weight. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification