Hooklift Mass Determination via Hydraulic Model
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hooklift systems require lifting the demountable platform onto a vehicle for weighing, necessitate the use of weight sensors, and are time-consuming in determining the mass and center of mass.
Innovation Solution
A method using a mathematical model to determine the mass and center of mass of a demountable platform by measuring a physical quantity during lifting, such as rotation angle or piston rod position, without relying on weight sensors, through an iterative process to calculate load force parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If weight sensors are used to determine the mass of the demountable platform, then measurement precision is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent replaces mechanical weight sensors with a mathematical model based on hydraulic pressure measurements. The load force on the main cylinder is determined through pressure sensors in the hydraulic system, and mass is calculated using a mathematical model that relates load force to mass and center of mass position, eliminating the need for mechanical weight sensors under the platform
Solution Approach 2:
The patent introduces a mathematical model as an intermediary between the hydraulic system and the mass determination. The model uses physical quantities measured during lifting (hydraulic pressure, cylinder position) to calculate mass and center of mass, serving as a mediator that transforms hydraulic measurements into mass information without direct mechanical contact
2Measurement precision
If the demountable platform is lifted onto the vehicle for weighing, then measurement precision is improved, but loss of time increases and productivity deteriorates
Solution Approach 1:
The patent merges the lifting operation with the weighing operation. The same lifting movement that positions the platform onto the vehicle is simultaneously used to collect data for mass determination through the mathematical model, eliminating the need for separate weighing steps and reducing total time
Solution Approach 2:
The patent ensures continuous useful action by performing mass determination during the lifting process itself. The hydraulic pressure measurements and mathematical model calculations occur continuously throughout the lifting movement, rather than requiring the platform to be stationary on a separate weighing device
3Measurement precision
If moveable weight sensors are used under the demountable platform, then measurement precision is improved, but ease of operation deteriorates and device complexity increases
Solution Approach 1:
The patent replaces the mechanical weight sensor system that requires physical placement under the platform with a hydraulic pressure measurement system. The pressure sensors are already integrated into the main cylinder, eliminating the need for separate weight sensors and simplifying the operational procedure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables quick, accurate, and sensor-free determination of the mass and center of mass of a demountable platform during lifting, reducing the time and complexity associated with traditional weighing methods.
Implementation Method 1
determining, at predetermined values of the physical quantity, values of the load force of a main cylinder of the hooklift
Implementation Method 2
a first parameter for the mass of the demountable platform, a second parameter for the longitudinal position of the centre of mass of the demountable platform and a third parameter for the vertical position of the centre of mass of the demountable platform
Data Source
AI summary
The present invention relates to a method for determining the mass and the centre of mass of a demountable platform by using a mathematical model, the parameters of which are estimated using an iterative procedure.