Method and System for Estimating Payload Weight with Hydraulic Fluid Temperature Compensation

摘要

A system for estimating the weight of a payload in a bucket of a machine is provided. The system includes a lift linkage supporting the bucket and a hydraulic lift cylinder assembly connected to the lift linkage. A pressure sensor is arranged remotely from the lift cylinder assembly. A payload measurement system is configured to monitor pressure data from the pressure sensor, hydraulic fluid temperature data and cylinder extension velocity data. The payload measurement system estimates a weight of the payload in the bucket based on the pressure data as adjusted by an estimate of a pressure drop between the lift cylinder assembly and the pressure sensor, the estimate of the pressure drop being determined based on a mathematical model that has been fitted to empirical data.

主权项

1. A system for estimating the weight of a payload in a bucket of a machine, the system comprising:
a pivotable lift linkage supporting the bucket; a lift cylinder assembly connected to the lift linkage and configured to be movable by pressurized hydraulic fluid between extended and retracted positions for pivoting the lift linkage to move the bucket between raised and lowered positions; a pressure sensor arranged remotely from the lift cylinder assembly and configured to provide pressure data relating to pressure in the lift cylinder assembly; and a payload measurement system configured to monitor the pressure data from the pressure sensor, temperature data relating to a temperature of the hydraulic fluid in the lift cylinder assembly and extension velocity data relating to velocity of extension of the lift cylinder assembly, the payload measurement system being configured to estimate a weight of the payload in the bucket based on the pressure data as adjusted by an estimate of a pressure drop between the lift cylinder assembly and the pressure sensor, the payload measurement system being configured to determine the estimate of the pressure drop based on the temperature data, the extension velocity data and a mathematical model that has been fitted to empirical data relating to pressure loss between the lift cylinder assembly and the pressure sensor at different hydraulic fluid temperatures and lift cylinder assembly extension velocities.