Hydrostatic Lifting Unit Load Determination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hoists on mobile work machines require complex and expensive position sensors to determine load, which are prone to failure and disrupt the lifting or loading process, necessitating a simpler and more reliable method for load determination.
Innovation Solution
A hydrostatic hoist with a pressure detection unit and an electronic estimating device that calculates load based on load pressure and kinematic parameters, eliminating the need for position sensors by estimating position through load pressure curves and comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If position sensors are installed to detect kinematic position for load determination, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical position sensors with a hydrostatic estimation system that uses fluid pressure measurements and kinematic modeling to determine load. The control unit calculates position based on pressure data from the hydrostatic actuator, eliminating the need for separate position sensing hardware while maintaining measurement accuracy.
Solution Approach 2:
The patent introduces pressure as an intermediary parameter that indirectly provides position information. Instead of directly measuring position, the system measures hydrostatic pressure and uses it to infer position through established kinematic relationships, simplifying the measurement system while preserving accuracy.
2Reliability
If multiple position sensors are installed to increase accuracy and reliability, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces multiple mechanical position sensors with a single hydrostatic pressure sensing system. The pressure measurements from the hydrostatic actuator, combined with kinematic modeling in the control unit, provide reliable position and load determination without requiring multiple redundant sensors.
Solution Approach 2:
The hydrostatic pressure measurement system serves multiple functions simultaneously: it provides both position information and load information. This multi-functionality eliminates the need for separate position sensors and load cells, reducing system complexity while maintaining or improving reliability.
3Device complexity
If contact sensors are used for load determination, then device complexity is reduced, but productivity decreases due to process disruption
Solution Approach 1:
The patent enables continuous load determination throughout the lifting operation by using hydrostatic pressure measurements that are available at all times during actuator movement. Unlike contact sensors that require specific positions, the hydrostatic system provides continuous data, eliminating process interruptions and maintaining productivity.
Solution Approach 2:
The patent replaces contact-based position sensing with hydrostatic pressure sensing that works continuously during movement. This substitution eliminates the need to stop or position the mechanism at specific points for measurement, allowing uninterrupted lifting operations.
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 accurate and cost-effective load determination without complex position sensors, allowing for efficient and uninterrupted lifting or loading processes by using load pressure data to estimate position and weight, thereby simplifying the weighing function.
Implementation Method 1
a pressure sensing unit, in particular a pressure sensor, is provided, via which the load pressure of the at least one actuator can be detected
Data Source
Figure 1~2
AI summary
What is disclosed is a hydrostatic lifting unit for a mobile working machine, having an actuator, in particular a hydraulic cylinder, on which a load receptacle is articulated in dependence on a lifting requirement, having a pressure detection unit by means of which a load pressure of the actuator can be detected, and having a control unit by means of which a received load can be determined in dependence on the load pressure and on a position of the lifting unit. Also disclosed are a mobile working machine having the lifting unit, and a method for determining the received load.