Set-Point Recompense in Filling Weigher using Kalman Filter

Abstract

In control system, one variable which is significant to a system is a set-point because it defines the system to initialize or to end its operation. Assigning the set-point can be set in two ways as follows, 1) the set-point is set identical to the desired value and 2) the set-point is compensated to satisfy the target value. In this work, the latter case is employed to lessen errors in a filling weighing system. Due to, in such system, a sensor is placed beneath a weighing container whilst a substance is filled from the top. By the time that the sensor senses the desired quantity, there is some quantity which has not been measured still left in the air. Hence, the excess of weight is occurred. In reality, the surplus is not constant owing to some noises interfere. To surmount this problem, Kalman filtering is introduced to compensate the weight set-point to meet the exact excess consistently. To illustrate its performance, the proposed technique is experimented with a practical machine at the target weight of 3505 grams. The results have revealed that the proposed approach is well performed which provides the measured weight error as low as 0.08%.