Work Vehicle Control System Hydraulic Load Limiting
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Solution Overview
Problem
When an operating device is quickly operated in a reciprocating manner in the full operation range of a work vehicle, excessive loads are applied to the work machine at the operating limit positions of the dumping and tilting movements, potentially causing damage and increasing the weight and cost of the machine.
Innovation Solution
A control system that includes a hydraulic device and a control device to adjust the supply of hydraulic fluid to the bucket cylinder, which acquires operation data to determine if the operating conditions exceed predefined thresholds, and outputs a limit command to restrict the hydraulic fluid supply, thereby limiting the bucket's movement to prevent excessive loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the operating device is quickly operated in a reciprocating manner in the full operation range to shake off adhering earth and sand, then the productivity is improved, but an excessive load is given to the work machine causing weight increase or cost increase
Solution Approach 1:
The control device dynamically changes the hydraulic supply parameters (flow rate, pressure) based on the detected operating conditions. When rapid reciprocating operation is detected, the system adjusts hydraulic parameters to limit the bucket movement speed and range, thereby controlling the load on the work machine while still enabling the shaking off function to occur.
2Productivity
If the operating device is quickly operated in a reciprocating manner in the full operation range to shake off adhering earth and sand, then the productivity is improved, but the work machine may be damaged due to excessive load
Solution Approach 1:
The control device continuously monitors the operating device's movement state and provides feedback control. When rapid reciprocating operation is detected, the system automatically adjusts the hydraulic supply to limit the bucket movement, preventing excessive load that could damage the work machine while maintaining the ability to shake off adhering material.
Solution Approach 2:
The control device detects the intent for rapid reciprocating operation and applies counter-action in advance by limiting the hydraulic supply before excessive load can develop. This preliminary restriction prevents the bucket from reaching extreme positions that would cause damaging loads on the work machine components.
3Object-generated harmful factors
If the operating device is operated in a reciprocating manner in the full operation range, then the earth and sand can be shaken off from the bucket, but an excessive load is given to the work machine at the operating limit positions
Solution Approach 1:
The control device adjusts hydraulic supply parameters based on the detected operating conditions. When rapid reciprocating operation is detected, the system limits the hydraulic flow to prevent the bucket from reaching extreme positions where excessive load would occur, while still allowing sufficient movement to shake off adhering earth and sand.
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 solution reduces the load on the work machine, preventing damage and maintaining operational efficiency while minimizing the need for heavy-duty materials and structures, thus reducing costs.
Implementation Method 1
a hydraulic device configured to adjust a supply state of hydraulic fluid supplied to a hydraulic cylinder configured to cause a work tool to operate
Data Source
AI summary
A work vehicle control system includes: a hydraulic device configured to adjust a supply state of hydraulic fluid supplied to a hydraulic cylinder configured to cause a work tool to operate; and a control device configured to control the hydraulic device. The control device includes: an operation data acquisition unit configured to acquire operation data indicating an operation state of an operating device operated in order to cause a work tool to perform dumping and tilting movements; and a control command unit configured to output, based on the operation data, a control command to control the hydraulic device; an operating condition determination unit configured to determine, based on the operation data, whether the operating device is operated under prescribed operating conditions; and a limit command unit configured to output a limit command to limit the control command when the operating device is determined to be operated under the operating conditions.