Work Machine Hydraulic Pilot Pressure Correction for Stability
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Solution Overview
Problem
Existing work machines, particularly those with hydraulic pilot type drive hydraulic circuits, face challenges in implementing operation limitations to prevent overturning and maintain stability during sudden stops without impairing operability or responsiveness.
Innovation Solution
A work machine configuration that includes a calculation device for predicting sudden stoppage behavior and judging stability, with an actuator drive hydraulic circuit featuring a pilot pressure correction unit to gradually limit deceleration and operation speed, ensuring stable operation without altering conventional operability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If operation limitation control is implemented to prevent overturning during sudden stops, then stability is improved, but operability and responsiveness deteriorate
Solution Approach 1:
The control system dynamically adjusts the degree of operation limitation based on real-time stability assessment. When overturn risk is detected, the system gradually limits deceleration and operation speed; when stable, full operability is restored. This dynamic adaptation resolves the contradiction by making the system responsive to actual conditions rather than applying fixed restrictions.
Solution Approach 2:
The system changes key parameters (deceleration rate, operation speed) based on stability calculations. During sudden stops, deceleration is limited to gradual values rather than immediate stopping, and operation speed is capped at safe levels. These parameter adjustments maintain stability while preserving as much operability as possible under constrained conditions.
2Speed
If the drive actuator stops suddenly in response to overturn warning, then response time is improved, but stability deteriorates due to strong inertial force
Solution Approach 1:
The control system applies preliminary anti-action by detecting potential overturn conditions and issuing gradual stoppage commands before the machine actually overturns. This preemptive gradual deceleration counteracts the inertial forces that would otherwise cause instability during emergency stopping.
Solution Approach 2:
The system provides beforehand cushioning by implementing gradual deceleration profiles that cushion the impact of stopping. Rather than abrupt halts that generate strong inertial forces, the system pre-calculates and applies controlled deceleration rates that absorb inertial effects and maintain stability throughout the stopping process.
3Ease of operation
If conventional hydraulic pilot type drive hydraulic circuit is used, then ease of operation is improved, but ability to implement operation limitation deteriorates
Solution Approach 1:
The control system is designed to work universally with conventional hydraulic pilot type drive circuits while adding operation limitation functionality. The calculation device interfaces with existing hydraulic components (flow control valves, pressure reducing valves) to implement gradual stoppage and speed limitation without requiring fundamental circuit redesign, thus maintaining ease of operation while gaining adaptability.
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
The solution effectively prevents overturning and maintains stability during forceful or erroneous operations by gradually controlling the drive actuators, ensuring the work machine can continue operating safely without compromising its responsiveness or conventional operability.
Implementation Method 1
a proportional pressure reducing valve for outputting pilot hydraulic fluid to the flow control valve according to an operation on a control lever
Implementation Method 2
a flow control valve that controls supply of hydraulic fluid to the drive actuator
Implementation Method 3
a pilot pressure correction unit that corrects pilot pressure outputted from the proportional pressure reducing valve according to the gradual stoppage command and the operation speed limitation command
Data Source
AI summary
The work machine includes a stabilization control calculation unit that calculates and outputs a gradual stoppage command for making a drive actuator stop gradually and an operation speed limitation command for limiting an upper limit operation speed according to the status of stability of the work machine, a stoppage characteristic modification unit that corrects pilot pressure so as to make the drive actuator stop gradually when a stoppage operation is performed on a control lever, and an operation speed limitation unit that corrects the pilot pressure so as to limit the operation speed of the drive actuator.