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, and at least one cylinder for modifying said implement linkage geometry, said apparatus comprising:
- means for delivering a first signal in response to sensing the hydraulic pressure of said cylinder;
means for delivering a second signal in response to sensing rotation of said implement linkage about said linkage connection pivot pin; and
means for deriving payload weight in response to said first and second signals.
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Accused Products
Abstract
A dynamic payload monitor measures and displays payload weight for a loader vehicle by sensing the hydraulic pressure and position of the lift arm cylinders. The payload weight is computed by curve fitting the sensed cylinder pressure and position data to a second order polynomial, and then performing interpolation or extrapolation with a pair of pressure versus position reference parabolas obtained during calibration. 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 one hydraulic cylinder for modifying the linkage geometry.
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Citations
20 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, and at least one cylinder for modifying said implement linkage geometry, said apparatus comprising:
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means for delivering a first signal in response to sensing the hydraulic pressure of said cylinder; means for delivering a second signal in response to sensing rotation of said implement linkage about said linkage connection pivot pin; and means for deriving payload weight in response to said first and second signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for dynamically measuring and indicating payload weight for a vehicle having at least one lift cylinder for elevating a payload carrier, said vehicle generally executing a work cycle including lifting said payload carrier, said method comprising the steps of:
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sensing said lift cylinder hydraulic pressure during said work cycle; delivering a plurality of first signals in response to said sensed pressure; sensing said lift cylinder extension during said work cycle; delivering a plurality of second signals in response to said sensed extension; deriving a second order polynomial geometric representation for said plurality of first and second signals; comparing said geometric representation to at least one other second order polynomial geometric representation of a known reference payload weight; and calculating an actual payload weight in response to said comparison. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus for dynamically measuring and indicating payload weight for a vehicle having at least one implement linkage, and at least one cylinder for modifying said implement linkage geometry, said apparatus comprising:
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means for delivering a first signal in response to sensing the hydraulic pressure of said cylinder; means for delivering a second signal in response to sensing said linkage geometry with respect to said vehicle; means for deriving payload weight in response to said first and second signals; and wherein said payload weight deriving means produces first and second reference payload parabolic curves, receives said first and second signals, and calculates an actual payload parabolic curve by interpolating between said first and second reference payload curves in response to said first signal value being within the area bounded by said reference payload curves, and by extrapolating beyond said first and second reference payload curves in response to said first signal value being outside of the area bounded by said reference payload curves. - View Dependent Claims (17, 18, 19, 20)
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Specification