Blade Stabilization System Using Direction-Dependent Gain Control
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Solution Overview
Problem
Work vehicles with ground-engaging blades experience pitching due to uneven ground surfaces, leading to unintended vertical variations and potential 'washboard' patterns, as the pitching is transmitted to the blade and can create self-reinforcing ground disturbances.
Innovation Solution
A system comprising a chassis, ground-engaging blade, sensor, and controller, where the blade is movably connected via a linkage, and a sensor provides a pitch signal to the controller to adjust the blade's position based on gain values specific to forward and backward pitching directions, using a hydraulic cylinder and valve to counteract pitching effects, ensuring a smoother surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the blade is fixed to the chassis, then the structure is simple, but the blade position cannot be adjusted to counteract pitching effects
Solution Approach 1:
The blade is connected to the chassis through a movable linkage system rather than being fixed, allowing dynamic adjustment of blade position. The linkage includes movable connections at multiple points (front end to front of chassis, rear end to rear of chassis) enabling the blade to adapt its position in response to chassis pitching movements.
Solution Approach 2:
A hydraulic cylinder acts as an intermediary mechanism between the chassis and the blade, providing controlled position adjustment. The hydraulic system includes a cylinder connected to the linkage, allowing precise control of blade position through hydraulic actuation in response to pitch sensor signals.
2Reliability
If a single gain value is used for pitch correction, then the control system is simple, but it cannot account for different pitching directions effectively
Solution Approach 1:
The control system uses direction-dependent gain values where the first gain applies when the chassis pitches forward and the second gain applies when the chassis pitches backward. This allows the system to optimize correction strength for each direction independently, improving reliability of pitch correction.
Solution Approach 2:
The control system dynamically switches between different gain values based on the detected pitch direction. The controller determines which gain to apply based on the sign and magnitude of the pitch signal, enabling adaptive response to different operating conditions.
3Manufacturing precision
If the blade position is not adjusted, then the system is simple, but vertical variations and washboard patterns are created on the ground surface
Solution Approach 1:
The system uses a pitch sensor to detect chassis pitch angle and provides feedback to the controller. The controller processes this feedback signal and automatically adjusts the blade position through the hydraulic system to counteract the pitching effects, ensuring smooth ground surface creation.
Solution Approach 2:
The automatic stabilization system operates autonomously by detecting pitch conditions and self-correcting blade position without operator intervention. The system monitors pitch signal continuously and automatically applies appropriate correction commands to maintain blade contact with the ground.
Data Source
AI summary
A work vehicle may include a chassis, a ground-engaging blade, a sensor, and a controller. The ground-engaging blade may be movably connected to the chassis via a linkage configured to allow the blade to be raised or lowered relative to the chassis. The sensor may be connected to the chassis at a fixed relative position to the chassis and configured to provide a pitch signal indicative of a rotational velocity in a pitch direction. The controller may be configured to receive the pitch signal and send a command to raise or lower the blade, the command based on a first gain and the pitch signal when the pitch signal indicates a rotational velocity in a first direction and based on a second gain and the pitch signal when the pitch signal indicates a rotational velocity in a second direction.