Electric Vehicle Wheel Control for Tight Headland Turns
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Solution Overview
Problem
Conventional farm vehicles, especially ICE-powered tractors, face challenges in headland operations due to operator fatigue and reduced productivity caused by the need for multiple operations like steering and inner wheel braking, leading to a restricted turning radius and stability issues, particularly in varying soil conditions.
Innovation Solution
The system optimizes electric farm vehicle performance by differentially controlling wheel speeds and selectively braking rear wheels during headland turns, allowing for faster rotation of outer wheels compared to inner wheels and front wheels compared to rear wheels, thereby reducing the turning radius and improving stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional ICE-powered tractors use mechanical transmission with single power source, then power distribution is simplified, but turning radius is restricted and operator fatigue increases
Solution Approach 1:
The patent segments the power distribution system by providing independent electric motors to each wheel, allowing individual control of each wheel's speed and torque. This segmentation enables the outer wheels to rotate faster than inner wheels during turns, reducing the turning radius and eliminating the need for operator braking interventions, thereby reducing operator fatigue while managing system complexity through modular electric motor units.
2Adaptability or versatility
If front and rear axles are connected through mechanical drive, then power transmission is straightforward, but variable wheelbase is restricted
Solution Approach 1:
The patent replaces the mechanical drive connection between front and rear axles with independent electric motor units at each wheel. This substitution of mechanical coupling with electrically controlled independent motors enables variable wheelbase configuration and differential wheel speeds during headland turns, achieving adaptability without the complexity of mechanical differential mechanisms.
3Productivity
If operator performs multiple operations like steering and inner wheel braking, then vehicle control is achieved, but productivity decreases
Solution Approach 1:
The patent implements self-service by providing automated differential speed control where the system automatically adjusts the speed of inner and outer wheels during headland turns without operator intervention. The electric motor control system autonomously manages the speed differential and braking requirements, eliminating the need for operator braking operations and significantly improving headland turn productivity while reducing operator workload.
4Productivity
If vehicle makes tight headland turns, then productivity is optimized, but vehicle stability deteriorates
Solution Approach 1:
The patent applies local quality by providing independent control of each wheel's motor, allowing precise adjustment of speed and torque at each individual wheel. During tight headland turns, the system can apply braking force selectively to specific wheels while maintaining optimal speed on others, enabling tight turning radius while maintaining vehicle stability through localized force application rather than uniform braking.
Data Source
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AI summary
Embodiments herein disclose methods and systems for optimizing the productivity and improving the stability of electric vehicles by sensing field size and soil condition and automatically assisting the vehicle to turn by rotating inner wheels faster as compared to outer wheels of the vehicle and rotating front wheels of the vehicle faster as compared to rear wheels of the vehicle, and selectively braking respective wheel during headland operations. Embodiments herein enable operators to attain tight headland turns with lower head land space. Embodiments herein can detect a plurality of parameters such as, field conditions, soil condition, implements(s) connected to the vehicle, and so on, and control the turning radius of the vehicle as per requirement in at least one mode.