Dynamic Steering Feedback for Turf Maintenance Vehicles
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Solution Overview
Problem
Turf maintenance vehicles, such as ride-on mowers, require skilled operation, especially at high speeds and on uneven terrain, due to the complexity of controlling speed and steering, which can lead to loss of control during sharp turns.
Innovation Solution
A dynamic tactical steering feedback system that includes a controller, input devices for detecting steering angle and ground speed, and output devices to adjust steering resistance, turning ratio, speed limit, and turning angle limit, enhancing driver control by varying these parameters based on detected inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the vehicle travels at high speed, then productivity is improved, but the difficulty of control increases and loss of control may occur during sharp turns
Solution Approach 1:
The steering ratio is made variable rather than fixed. The system dynamically adjusts the steering ratio based on detected vehicle speed and steering angle, providing different steering characteristics for different operating conditions. This resolves the contradiction by allowing high-speed stability while maintaining low-speed maneuverability
Solution Approach 2:
The system uses sensors to detect vehicle speed and steering angle, then feeds this information back to the controller which adjusts the steering ratio accordingly. This closed-loop feedback mechanism automatically adapts the steering characteristics to current operating conditions, reducing control difficulty at high speeds while maintaining productivity
2Adaptability or versatility
If the vehicle makes sharp turns, then maneuverability is improved, but the speed must be reduced to maintain control
Solution Approach 1:
The steering ratio dynamically adapts based on steering angle and speed. During sharp turns at low speeds, the system provides a lower steering ratio for enhanced maneuverability. When straight-line travel at higher speeds is detected, the steering ratio increases for stability, thus resolving the trade-off between maneuverability and speed
3Stability of the object's composition
If the steering ratio is increased for straight-line stability, then control at high speed is improved, but maneuverability during turns deteriorates
Solution Approach 1:
The steering ratio is made dynamically adjustable based on real-time detection of vehicle speed and steering angle. The system automatically selects appropriate steering characteristics: lower ratio for turning maneuvers and higher ratio for straight-line travel, eliminating the need to compromise between stability and maneuverability
Solution Approach 2:
The system changes the steering ratio parameter dynamically based on operating conditions. By monitoring speed and steering angle, the controller adjusts this critical parameter to optimize both straight-line stability and turning maneuverability at different moments during vehicle operation
Data Source
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AI summary
A dynamic tactical feedback system for a turf maintenance vehicle (10) includes an input device (31) that detects a steering angle and/or a ground speed of the turf maintenance vehicle. The input device transmits an input signal correlative to the steering angle and/or ground speed of the turf maintenance vehicle. The system also includes an output device that affects a steering resistance (30), a turning ratio, a speed limit, the ground speed and/or a turning angle limit of the turf maintenance vehicle. The system additionally includes a controller (36) that receives the input signal and outputs a control signal to the output device based on the input signal so as to change the steering resistance, the turning ratio, the speed limit, the ground speed and/or the turning angle limit of the turf maintenance vehicle based on the input signal. A method of controlling the turf maintenance vehicle is also disclosed.