Construction Equipment Controller Speed Regulation for Rolling Compaction

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Solution Overview

Problem

Construction machines like hydraulic excavators face operability issues during rolling compaction operations due to large variations in cylinder speed caused by slight differences in lever manipulation, leading to excessive vibration and the need for careful operator control.

Innovation Solution

A controller system that determines whether the machine is in a rolling compaction operation and regulates the motion speed of the working equipment to not exceed a predetermined maximum value, using manipulation information from the lever or pressure sensors to automatically adjust the command output and maintain stable operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a U-shaped relation between lever manipulation amount and cylinder speed is used to combine slow motion and maximum speed motion, then the construction machine can achieve both slow and fast motion capabilities, but a slight difference in lever manipulation amount results in a large difference in cylinder speed causing excessive vibration

Engineering Contradiction:

Improvemotion speed rangeVSAvoidoperational stability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the speed characteristic based on the operation mode. During rolling compaction operations, the system changes the speed characteristic parameter to a linear relation between lever manipulation amount and cylinder speed, while maintaining the U-shaped relation during other operations. This resolves the contradiction by adapting the parameter to the specific operational context.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamics by making the speed characteristic adaptive rather than fixed. The controller dynamically switches between different speed characteristics (U-shaped for general operations, linear for rolling compaction) based on operation mode detection. This dynamic adjustment allows the system to maintain both versatility and operational stability under different conditions.

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If the cylinder speed is highly responsive to lever manipulation amount, then the working equipment can be controlled precisely, but the working equipment beats the ground too hard causing large vibration on the vehicle body

Engineering Contradiction:

Improvecontrol precisionVSAvoidvehicle body vibration

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent changes the speed characteristic parameter from highly responsive (U-shaped) to linear during rolling compaction operations. This parameter change reduces the amplification effect where small lever manipulations would otherwise cause large speed variations, thereby reducing ground impact and vehicle vibration while maintaining adequate control precision.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system employs feedback through operation mode detection. The controller monitors operation characteristics and provides feedback to adjust the speed characteristic accordingly. During rolling compaction, the feedback mechanism triggers a linear speed characteristic to prevent excessive vibration, while maintaining U-shaped characteristic during other operations for precise control.

Inventive Principle:

Principle #23Feedback

3Object-affected harmful factors

If the operator carefully manipulates the working equipment lever to avoid careless increase in lever manipulation amount, then excessive vibration can be avoided, but the operability of the working equipment deteriorates

Engineering Contradiction:

Improvevehicle body vibrationVSAvoidoperability

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The system performs self-service by automatically detecting operation modes and adjusting speed characteristics without requiring operator intervention. The controller autonomously switches between U-shaped and linear speed characteristics based on detected operation patterns, eliminating the need for operators to carefully manipulate the lever while preventing vibration.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The feedback mechanism automatically monitors operation characteristics and adjusts system behavior accordingly. When rolling compaction operations are detected, the system provides feedback control to limit speed variations and prevent vibration, while maintaining ease of operation during other modes. This automatic feedback eliminates the burden of careful manual manipulation.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS8930090B2Construction equipment, method for controlling construction equipment, and program for causing computer to execute the method

Publication Date: 2015.01.06 KOMATSU LTD

AI summary

A construction machine includes: a working equipment; a manipulating unit that manipulates the working equipment; and a controller that controls the working equipment. The controller includes: a rolling compaction determining unit that determines whether or not the working equipment is under a rolling compaction operation for hardening earth and sand through reciprocation; and a command output regulating unit that controls the working equipment so that a motion speed of the working equipment does not exceed a predetermined maximum value when the rolling compaction determining unit determines that the working equipment is under the rolling compaction operation.