Work Vehicle Blade Control via Hydraulic Cylinder Stroke Difference
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Solution Overview
Problem
Existing work vehicles with pitch/tilt cylinders of different lengths require complex control mechanisms to manage blade positions, limiting their functionality to vehicles with specific cylinder configurations.
Innovation Solution
A work vehicle equipped with a controller that adjusts the blade position based on the difference in stroke amounts of lift cylinders, allowing for simple control regardless of the lengths of the pitch/tilt cylinders, by driving one cylinder to a predetermined stroke end and adjusting the other to match the stroke amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pitch/tilt cylinders of different lengths are used to control blade position, then the blade can be tilted forward, backward, leftward, and rightward, but the control system becomes complex and is limited to vehicles with specific cylinder configurations
Solution Approach 1:
The control system monitors the stroke amounts of pitch/tilt cylinders and dynamically adjusts control parameters based on the difference in stroke amounts between left and right cylinders. This allows the system to adapt to different cylinder configurations and achieve intermediate tilt positions without requiring complex mechanical mechanisms.
Solution Approach 2:
The control system continuously detects the stroke amounts of the pitch/tilt cylinders and uses this feedback information to determine when to execute intermediate tilt control. By monitoring the difference in stroke amounts, the system can automatically initiate adjustment operations to achieve the desired intermediate tilt position.
2Measurement precision
If four stroke sensors are used to detect stroke amounts of lift cylinders and pitch/tilt cylinders, then the blade position can be precisely identified, but the system cost increases
Solution Approach 1:
The stroke sensors originally designed for detecting lift cylinder positions are made multi-functional by using them to detect both lift cylinder stroke amounts and, through computational processing, pitch/tilt cylinder stroke amounts. This allows the system to achieve precise blade position identification using fewer sensors.
Solution Approach 2:
The control system acts as an intermediary that processes the stroke amount difference data from the lift cylinders to infer the blade's tilt position. By using the lift cylinder stroke difference as a proxy indicator, the system can determine blade position without requiring dedicated sensors on the pitch/tilt cylinders.
3Ease of manufacture
If automatic control based on lift cylinder stroke amounts is implemented, then the blade position can be controlled with fewer sensors, but the control accuracy is limited when pitch/tilt cylinders have different lengths
Solution Approach 1:
The control system dynamically adjusts the tilt control based on the real-time stroke amount difference between left and right pitch/tilt cylinders. When the difference exceeds a predetermined threshold, the system executes intermediate tilt control operations, making the control process adaptive rather than static.
Solution Approach 2:
The control system pre-establishes threshold values for the stroke amount difference that trigger intermediate tilt control. By setting these thresholds in advance based on the cylinder configuration, the system can automatically initiate appropriate control actions without requiring complex real-time calculations.
Data Source
AI summary
A work vehicle includes a vehicle body, a blade supported on the vehicle body, a pair of first hydraulic cylinders for moving the blade upward and downward, a pair of second hydraulic cylinders for tilting the blade forward, backward, leftward, and rightward, a pair of stroke sensors for detecting stroke amounts of the pair of first hydraulic cylinders, and a controller for controlling a position of the blade based on a difference in the stroke amounts of the pair of first hydraulic cylinders when, in a state where one second hydraulic cylinder is at the one stroke end or the other stroke end, the other second hydraulic cylinder is driven from one stroke end to the other stroke end.