Hydraulic Boom Torque Calculation for Speed Control
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Solution Overview
Problem
Actuator arrangements with multiple movable parts face challenges in maintaining consistent downward movement speed despite varying loads, leading to potential operator surprise and increased wear, especially when using hydraulic systems, as existing solutions require multiple sensors, increasing costs and maintenance needs.
Innovation Solution
A method that calculates the torque exerted on the tool attachment device using attitude, mass, and tool type information to decouple the mass distribution and speed of passive movements, allowing for reduced sensor requirements and improved user-friendliness by maintaining constant rotational speed, thereby reducing the risk of damage and accidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a venting valve is opened to allow passive downward movement of the lifting boom, then energy consumption is reduced and wear is decreased, but the downward movement speed varies largely with load
Solution Approach 1:
The control device receives information about the actual downward movement speed and uses this feedback to adjust the venting valve opening dynamically. This closed-loop control ensures that the downward movement speed remains consistent regardless of load variations, while still allowing passive movement to occur for energy efficiency.
Solution Approach 2:
The venting valve opening is made dynamically adjustable based on actual movement conditions. The control device continuously adapts the valve opening to maintain consistent downward speed, transforming a static system into a dynamic one that responds to changing loads.
2Speed
If the venting valve orifice size is made variable to regulate downward movement speed, then speed control is improved, but device complexity increases
Solution Approach 1:
The mechanical control system is replaced with an electronic control device that receives information from sensors and actuates the venting valve electronically. This substitution simplifies the overall system by using electronic control rather than complex mechanical linkages.
Solution Approach 2:
The control device acts as an intermediary between the operator's intent and the venting valve actuation. It processes information about movement speed and load, then determines the appropriate valve opening, simplifying the control architecture while maintaining precise speed regulation.
3Measurement precision
If multiple sensors are added to measure load and position for each movable part, then measurement precision is improved, but device complexity and maintenance needs increase
Solution Approach 1:
The control device is designed to be multi-functional, serving both as the control unit for the venting valve and as the data processing center for all sensor inputs. This universal approach consolidates functions that could otherwise require separate dedicated systems, reducing overall complexity.
Solution Approach 2:
Multiple sensor functions (load measurement, position detection, speed calculation) are merged into a single integrated control device. This consolidation reduces the number of separate components and simplifies the system architecture while maintaining comprehensive measurement capabilities.
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
This approach allows for consistent movement speeds irrespective of load and position, reducing operator surprise and wear, while minimizing the need for additional sensors, thus enhancing user-friendliness and reducing maintenance costs.
Implementation Method 1
pressurised hydraulic fluid has to enter the respective lifting hydraulic piston
Implementation Method 2
Mechanical power has to be used to pressurise the fluid and to create a sufficient fluid flow for this lifting action
Implementation Method 3
slowing down the movement of the actuator arrangement that is caused by its own volition, e.g. by using mechanical brakes or by applying fluid dynamical resistance forces
Implementation Method 4
the respective venting valve can be controlled to have an orifice of a variable size, so that a different fluid flux may flow through the orifice
Implementation Method 5
When the lifting boom has to be lowered, however, gravity alone is usually able to do the job
Data Source
AI summary
The invention relates to a method (50) of operating an actuated arrangement (1) including a lifting boom (3), an associated lifting actuator (4), a tool attachment device (5) for attachment of a tool (7, 23), and an associated tilting actuator (6). The torque that is exerted onto the tool attachment device (5) is calculated using the attitude of the tool attachment device (5), a mass information, representing the mass that is connected to the tool attachment device (5), and a tool type information, representing the characteristics of the tool (7, 23) that is to be attached to the tool attachment device (5).