Tracked Vehicle Speed Control for Slippery Terrain
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Solution Overview
Problem
Tracked vehicles used for ski run preparation and forest maintenance often experience traction loss on slippery surfaces and steep slopes, leading to inefficient travel, energy dissipation, and track damage due to slippage.
Innovation Solution
A control method and device that acquires the traveling speed of the vehicle and its tracks, calculates a range of expected speeds, and adjusts track speeds to maintain optimal traction by varying power transmission to the tracks based on steering signals and longitudinal tilt, reducing slippage and energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the track speed is increased to improve travel speed, then productivity increases, but slippage and energy dissipation worsen on slippery surfaces
Solution Approach 1:
The track speed is made dynamically adjustable based on real-time comparison between actual vehicle speed and expected speed range. The control system continuously monitors speed parameters and automatically adjusts track speed to optimal values, transforming a static speed setting into a dynamic adaptive system that responds to changing terrain conditions
Solution Approach 2:
The system implements a feedback mechanism by comparing the actual traveling speed of the vehicle with the expected speed range derived from track speed. When deviation exceeds thresholds, the system triggers speed correction, creating a closed-loop control system that continuously optimizes track speed to prevent slippage and reduce energy loss
2Productivity
If the track speed is increased to maintain momentum on steep slopes, then travel efficiency improves, but track adhesion deteriorates causing slippage
Solution Approach 1:
The system dynamically adjusts track speed based on real-time performance feedback rather than using fixed speed settings. By continuously comparing actual vehicle speed with expected speed range, the system adapts track speed to maintain optimal adhesion conditions while preserving travel efficiency on varying terrain
Solution Approach 2:
The control system automatically monitors and adjusts track speed without external intervention. The electronic processor independently evaluates speed parameters, determines deviations from expected ranges, and executes speed corrections, enabling the system to self-regulate and maintain reliable track adhesion
3Loss of energy
If the track speed is continuously adjusted to prevent slippage, then energy loss is reduced, but the complexity of the control system increases
Solution Approach 1:
The system focuses on changing a single critical parameter - track speed - based on comparisons between actual and expected speed ranges. By concentrating control efforts on this key parameter rather than multiple system variables, the solution reduces energy loss while maintaining relatively simple control logic centered on speed regulation
4Productivity
If the track speed is increased to maintain schedule, then productivity improves, but track wear and damage increase due to slippage
Solution Approach 1:
The system dynamically optimizes track speed to balance productivity with track protection. By continuously adapting speed to actual terrain conditions through feedback comparison, the system prevents excessive slippage that causes wear while maintaining efficient travel speeds, thereby extending track service life without sacrificing productivity
Data Source
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AI summary
A control method of a tracked vehicle (1) having a track belt (3, 4) and configured to advance the tracked vehicle (1) provides for acquiring the driving speed (VV) of the tracked vehicle (1); acquiring the speeds (VT1, VT2 ) of the tracks (3, 4) with respect to the tracked vehicle (1); calculating a range of expected values of traveling speed (VV) as a function of speed (VT1; VT2) of the track (3, 4); and varying the speed (VT1; VT2 ) of the track (3, 4) when the traveling speed (VV) of the tracked vehicle (1) is outside the range of expected values.