Highly accurate platform weighing system

Details Highly accurate platform weighing system Highly accurate platform weighing system

1988-04-04

1989-06-06

Miller, Jr., George H.

Weighing scales

Computer

Electrical

177 50, 73 1B, G01G 2301, G01L 2500

Patent

active

048363081

ABSTRACT:
A platform weighing system (10) suitable for making accurate weight measurements of heavy objects, such as aircraft, is disclosed. Hardware and software combine to produce the accurate results. Analog hardware (14) includes hydraulic load cells (80a-80d), temperature sensing (91), filtering (90), and voltage-to-frequency conversion (104). Digital hardware (12) receives an oscillation signal output from the voltage-to-frequency conversion (104) and obtains load counts by monitoring the oscillation signal for consistent predetermined durations. The predetermined duration is chosen in software (226) to be immune to particularly pervasive noise signals. A microprocessor (16) converts load counts into a weight code which is output to a display (46). This conversion includes compensation for auto ranging (320), load cell excitation variance (282), temperature compensation (284), null offset variance (286), and zero drifting (304). In addition, nonlinearities in load cell output are compensated by linearly interpolating (288-296) between two of a plurality of calibration points that characterize the load cells (80a-80d ). Such compensations are performed primarily in software (200).

REFERENCES:
patent: 4693330 (1987-09-01), Uchimura et al.
patent: 4703815 (1987-11-01), Hirano et al.

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