Work Implement Force Control With Position-Based Pressure

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Solution Overview

Problem

Existing power machines, particularly work vehicles with lift arm structures, face challenges in maintaining consistent force on materials or objects being gripped, lifted, and moved without causing damage due to varying pressure requirements at different positions.

Innovation Solution

A controller is employed to automatically adjust the pressure on work implements based on the relative position between the implement and the arm, considering the material's characteristics, such as weight or density, to maintain optimal force throughout the gripping, lifting, and moving processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If manual pressure control is used on work implements, then operator flexibility is maintained, but consistent force application becomes difficult due to varying pressure requirements at different positions

Engineering Contradiction:

Improveforce consistencyVSAvoidoperator control complexity

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The system uses sensors to detect the position of the work implement and feeds this information back to the controller, which automatically adjusts the hydraulic pressure to maintain consistent force application throughout the work cycle

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The automated pressure control system performs the force regulation function itself based on position feedback, eliminating the need for manual operator intervention to maintain consistent force application

Inventive Principle:

Principle #25Self-service

2Reliability

If high pressure is applied to maintain grip on materials, then secure holding is achieved, but material damage may occur

Engineering Contradiction:

Improvegrip securityVSAvoidmaterial damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system dynamically adjusts the hydraulic pressure applied to the work implement based on real-time position feedback, automatically reducing pressure when the implement is in positions that require less force and maintaining optimal pressure for secure gripping without excessive force

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The controller changes the pressure parameter of the hydraulic fluid supplied to the work implement actuator based on detected position, optimizing the balance between grip security and material protection throughout the work cycle

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250283297A1Work implement force control

Publication Date: 2025.09.11 DOOSAN BOBCAT NORTH AMERICA INC

AI summary

A power machine includes a lift arm structure including a boom, an arm pivotally coupled to the boom and a work implement pivotally coupled to the arm. The work implement is configured to grip a material. A work implement actuator is configured to pivot the work implement relative to the arm and apply pressure to the material. At least one sensor is configured to provide a measurement for calculating a position angle of the work implement relative to the arm. A controller is configured to maintain an optimal pressure on the work implement actuator based on the position angle of the work implement relative to the arm and based on a characteristic of the material.