Work Vehicle Hydraulic Cylinder Stroke Reset Control
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Solution Overview
Problem
Existing work vehicles with tilt type buckets face inaccuracies in correcting stroke length deviations due to manufacturing errors or wobble, leading to incorrect resetting of the stroke position.
Innovation Solution
A work vehicle equipped with a hydraulic cylinder, regulation valve, position sensor, and control unit that measures the stroke length, determines proximity to the stroke end, and adjusts the regulation valve to accurately reset the stroke length, utilizing stoppers and operational commands to ensure precise correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the stroke position is reset with the stroke end of the hydraulic cylinder being defined as the reference position, then the stroke position can be reset, but the stroke position may be reset while the reference position is not reached due to manufacturing errors or wobble of a work implement, leading to inaccurate correction of stroke length deviation
Solution Approach 1:
The control unit performs preliminary detection of the reference position by monitoring the relationship between hydraulic oil pressure and cylinder stroke position before final resetting. It detects when the detected stroke position matches the predetermined reference stroke position, and only then proceeds with the stroke position reset, ensuring accurate reference position detection despite manufacturing errors or work implement wobble.
Solution Approach 2:
The system continuously monitors the detected stroke position from the position sensor and compares it with the reference stroke position. The control unit adjusts the reset timing based on feedback from this comparison, ensuring that the stroke position is reset only when the reference position is accurately detected, thereby improving measurement precision and reliability.
2Ease of operation
If a position sensor is used to detect the piston stroke position, then the stroke position can be measured, but slight slippage occurs between the rotary roller and the cylinder rod, causing an error between the detected stroke position and the actual stroke position
Solution Approach 1:
The system introduces an intermediary reference mechanism using hydraulic oil pressure as a mediator. The control unit detects the reference position by monitoring the relationship between hydraulic oil pressure and cylinder stroke position, rather than relying solely on the position sensor that may slip. This intermediary detection method compensates for the slippage errors in the position sensor.
Solution Approach 2:
The system partially replaces the mechanical position detection method (rotary roller on cylinder rod) with a pressure-based detection method. By using hydraulic oil pressure relationships to detect the reference position, the system reduces dependence on the mechanical position sensor that is prone to slippage, thereby improving measurement accuracy.
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 enables accurate correction of stroke length deviations, ensuring precise measurement and operation of the work vehicle's bucket, improving its performance and reliability.
Implementation Method 1
The hydraulic cylinder has the bucket pivot around the tilt axis
Implementation Method 2
The position sensor measures a stroke length of the hydraulic cylinder
Implementation Method 3
The regulation valve regulates an amount of supply of a hydraulic oil to be supplied to the hydraulic cylinder
Data Source
AI summary
A work implement has a boom, an arm, and a bucket pivotable around a bucket axis which is a pivot axis with respect to the arm and a tilt axis orthogonal to the bucket axis. The hydraulic cylinder has the bucket pivot around the tilt axis. The regulation valve regulates an amount of supply of a hydraulic oil to be supplied to the hydraulic cylinder based on a command signal. The position sensor measures a stroke length of the hydraulic cylinder. The control unit resets the stroke length measured by the position sensor. The control unit determines proximity to a stroke end of the hydraulic cylinder, generates a command signal for increasing a degree of opening of the regulation valve in the proximity of the stroke end, and resets the stroke length measured by the position sensor while the regulation valve is open in response to the command signal.