Rotating Upper Structure Alignment for Tracked Vehicle Direction Control
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Solution Overview
Problem
Tracked vehicles with rotatable upper structures face uncertainty in direction due to the relative angle of rotation between the upper and lower structures, leading to operator confusion and potential accidents.
Innovation Solution
A process involving an electronic control unit that aligns the upper structure relative to the lower structure at a predetermined angle, signaling alignment, and controlling rotation to prevent further operator input during alignment, using sensors and motors to manage the vehicle's directionality based on the operator's commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the upper structure is made rotatable relative to the lower structure, then the vehicle can transport material while minimizing ground movement, but the operator experiences uncertainty about vehicle direction
Solution Approach 1:
The system performs preliminary alignment of the upper structure to a predetermined angle (e.g., 0 degrees or parallel to lower structure) before allowing normal operation. This preliminary action establishes a known reference orientation, so when the operator presses the accelerator, the vehicle moves in the expected direction. The alignment command is executed in advance of normal driving operations.
Solution Approach 2:
The system continuously monitors the relative angle between upper and lower structures and provides feedback to the operator through visual displays showing the current angle and alignment status. This feedback loop allows the operator to understand the current orientation and predict vehicle movement direction, resolving the uncertainty caused by the rotatable upper structure.
2Adaptability or versatility
If the upper structure can rotate freely, then the vehicle is more versatile in work operations, but additional operator training is required
Solution Approach 1:
The system provides self-aligning capability where the upper structure automatically returns to or maintains the predetermined angle relative to the lower structure during normal driving operations. This self-service feature eliminates the need for operator intervention to maintain proper orientation, allowing versatile work operations without requiring extensive training on directional control.
Solution Approach 2:
The system dynamically adjusts the upper structure's rotational state based on operational mode. During driving, the upper structure is constrained to maintain alignment with the lower structure. During work operations, the upper structure can rotate freely to position work implements. This dynamic behavior provides versatility when needed while maintaining simplicity during transport.
3Ease of operation
If the upper structure rotation is controlled to align at predetermined angles, then directional uncertainty is reduced, but the control system becomes more complex
Solution Approach 1:
The system replaces complex mechanical alignment mechanisms with electronic sensors and control algorithms. An angle sensor continuously measures the relative orientation between upper and lower structures, and an electronic control unit processes this data to determine when alignment is achieved and to control the rotation motor. This substitution of mechanical systems with electronic ones reduces overall system complexity while maintaining precise alignment control.
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A tracked vehicle comprising: a body comprising a lower structure and an upper structure rotatable relative to the lower structure about an axis; an angle sensor for detecting rotation of the upper structure relative to the lower structure; first and second track assemblies mounted, respectively, on opposite lateral sides of the body; a prime mover; an electronic control unit (ECU); and a transmission for controllably transferring power from the prime mover to the track assemblies based on an output of the ECU. The ECU is configured for responding to the angle sensor having detected a relative angular displacement in excess of a threshold angular displacement by: causing a signal to be emitted via an output interface to indicate that a directionality switchover is available to be requested; and, in response to detecting a directionality switchover request, causing the transmission to implement a directionality switchover for the tracked vehicle.