Zero-Turn Driveline Control With Selectable Traction Modes
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Solution Overview
Problem
Zero-turn vehicles lack operating modes that can enhance performance in specific situations, such as maintaining a straight path, protecting turf, preventing slipping, and navigating tight spaces, which are not adequately addressed by their standard operating characteristics.
Innovation Solution
A zero-turn vehicle with a mode selection interface and a controller that modifies normal operating characteristics by implementing stored mode instructions, allowing for various operational modes such as straight mow, turf friendly, anti-slip, trailer loading, and auto zero turn, which adjust torque, RPM, and power independently of user inputs to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard operating characteristics are used, then the vehicle can operate in normal conditions, but it cannot enhance performance in specific situations such as maintaining straight paths, protecting turf, or navigating tight spaces
Solution Approach 1:
The control system dynamically adjusts operating characteristics based on selected mode. The controller modifies torque, RPM, and power delivery to traction motors in real-time according to the active operating mode (straight mow, turf friendly, anti-slip, etc.), allowing the system to adapt to different operational requirements without physical reconfiguration.
Solution Approach 2:
The system changes operational parameters (torque, RPM, power) based on mode selection. Each operating mode corresponds to a specific set of parameter adjustments that optimize vehicle performance for that particular situation, such as limiting speed differential for turf protection or adjusting torque distribution for anti-slip operation.
2Adaptability or versatility
If independent wheel rotation control is used, then zero turning radius is achieved, but the vehicle lacks specialized control for specific operational situations
Solution Approach 1:
The controller automatically implements mode-specific control strategies without requiring direct operator intervention for each adjustment. Once a mode is selected, the system self-adjusts torque distribution, speed differentials, and power delivery to achieve the desired operational characteristics, reducing the cognitive load on the operator.
Solution Approach 2:
The control system provides multiple operating modes that cover various operational situations (straight mowing, turf protection, anti-slip, tight space navigation, hill assistance). A single control system architecture handles all these different functions through software configuration rather than requiring separate control mechanisms for each situation.
3Productivity
If mode instructions modify vehicle signals independently of user inputs, then performance is enhanced in specific situations, but the control system becomes more complex
Solution Approach 1:
The controller acts as an intermediary between user inputs and the traction motors. It receives mode selection input and user control signals, then processes and modifies these signals according to the active mode before sending commands to the motors. This intermediary layer enables performance enhancement while maintaining a relatively simple user interface.
Solution Approach 2:
The system merges mode selection functionality with the existing user input system. The controller combines mode-specific instructions with real-time user inputs to generate final motor commands, integrating multiple control functions into a unified control architecture rather than requiring separate systems for mode management and operational control.
Data Source
AI summary
A zero-turn vehicle including a mode selection interface, a memory and at least one controller is provided. The mode selection interface provides a mode section input for a user. The memory is used to store mode instructions relating to at least one operation mode. The at least one controller in communication with the mode selection interface and the memory, the at least one controller configured to selectively modify normal operating characteristics of the zero-turn vehicle based the mode selection input from the user by implementing the stored mode instructions associated with the mode selection input.