Lateral Height Sensor Control for Accurate Milling Depth
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Solution Overview
Problem
Milling machines face challenges in maintaining accurate height control, especially on uneven or sloping ground surfaces, as existing technologies do not effectively address height measurements on such terrains, leading to inconsistencies in milling depth.
Innovation Solution
A milling machine system equipped with a height-adjustable body, laterally adjustable machine height sensors, and position sensors, along with an operator-controllable drive system and controller, which adjusts the milling rotor height based on sensor data to maintain accurate depth control on sloped surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional height sensors are used on milling machines operating on uneven ground, then the device complexity remains low, but the measurement precision deteriorates due to inability to account for lateral offsets and non-parallel orientations
Solution Approach 1:
The height measurement system is segmented into multiple individual height sensors positioned at different lateral locations on the machine. Each sensor independently measures height at its specific position, allowing the system to capture variations in ground elevation and machine orientation across different locations, thereby improving overall measurement precision on uneven terrain.
Solution Approach 2:
The system transitions from single-point height measurement to multi-point spatial measurement by adding lateral positioning information. Position sensors are integrated to measure the lateral positions of height sensors, creating a two-dimensional measurement framework (height + lateral position) that enables accurate height determination even when the machine body is non-parallel to the ground.
2Measurement precision
If multiple height sensors and position sensors are integrated, then the measurement precision improves for uneven ground, but the device complexity increases due to additional sensors and control systems
Solution Approach 1:
The system merges height sensors and position sensors into an integrated sensor array that functions as a unified measurement system. The controller receives and processes data from both sensor types simultaneously, combining height measurements with lateral position information to compute accurate milling depth control signals, thereby managing complexity through functional integration.
Solution Approach 2:
The controller implements feedback control by continuously receiving height measurements from the sensor array, comparing them against desired milling depth parameters, and automatically adjusting the milling machine's height position. This closed-loop feedback mechanism improves milling depth control accuracy while managing system complexity through automated control algorithms.
3Adaptability or versatility
If height sensors are made laterally adjustable, then the adaptability improves for different ground conditions, but the device complexity increases due to adjustment mechanisms
Solution Approach 1:
The height sensors are designed with lateral adjustability, transforming them from fixed-position sensors to dynamically repositionable sensors. This dynamic positioning capability allows the sensors to adapt to different ground conditions and machine orientations during operation, improving versatility while the adjustment mechanisms are integrated into the existing sensor mounting structures to minimize additional complexity.
Data Source
AI summary
A milling machine having a height-adjustable machine body includes a longitudinal axis and a lateral axis, a plurality of traction elements, a milling rotor assembly; and a machine height sensor system. The machine height sensor system includes a plurality of laterally adjustable machine height sensors and a plurality of position sensors, each associated with a respective height sensor and measuring a lateral extent of the height sensors.